U.S. patent application number 16/238414 was filed with the patent office on 2019-05-09 for dual fuel selectable apparatus.
The applicant listed for this patent is David Deng. Invention is credited to David Deng.
Application Number | 20190137097 16/238414 |
Document ID | / |
Family ID | 66326344 |
Filed Date | 2019-05-09 |
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United States Patent
Application |
20190137097 |
Kind Code |
A1 |
Deng; David |
May 9, 2019 |
DUAL FUEL SELECTABLE APPARATUS
Abstract
A heater assembly can be used with a gas appliance. The gas
appliance can be a dual fuel appliance for use with one of a first
fuel type or a second fuel type different than the first. The
heater assembly can include a pressure sensor and a plurality of
valves operable by a control module dependent upon a detected fuel
pressure. The valves may be solenoid valves that can reduce the
available fuel delivery paths to limit fuel delivery to a burner
when a higher pressure, such as detection of LP gas, is
detected.
Inventors: |
Deng; David; (Diamond Bar,
CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Deng; David |
Diamond Bar |
CA |
US |
|
|
Family ID: |
66326344 |
Appl. No.: |
16/238414 |
Filed: |
January 2, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15175799 |
Jun 7, 2016 |
10222057 |
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16238414 |
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13791652 |
Mar 8, 2013 |
9739389 |
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15175799 |
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13791667 |
Mar 8, 2013 |
9523497 |
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13791652 |
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13310664 |
Dec 2, 2011 |
8985094 |
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13791667 |
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62322746 |
Apr 14, 2016 |
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62216807 |
Sep 10, 2015 |
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61748044 |
Dec 31, 2012 |
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61748052 |
Dec 31, 2012 |
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61473714 |
Apr 8, 2011 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F23N 2237/08 20200101;
F23C 1/00 20130101; F23D 17/00 20130101; F23N 2235/24 20200101;
F23N 1/002 20130101; F23K 2900/05002 20130101; F23D 2900/05002
20130101; F23D 2900/14641 20130101; F23N 2235/20 20200101; F23D
2900/00017 20130101; F23N 2235/18 20200101; F23D 14/10 20130101;
F23D 23/00 20130101; F23K 2400/201 20200501; F23K 5/005 20130101;
F23N 2225/04 20200101; F23K 5/007 20130101 |
International
Class: |
F23D 14/10 20060101
F23D014/10; F23C 1/00 20060101 F23C001/00; F23D 23/00 20060101
F23D023/00; F23K 5/00 20060101 F23K005/00 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 20, 2011 |
CN |
201120401676.3 |
Jul 2, 2012 |
CN |
201210224414.3 |
Jul 2, 2012 |
CN |
201220314766.3 |
Jul 2, 2012 |
CN |
201220315268.0 |
Sep 13, 2012 |
CN |
201210336108.9 |
Sep 13, 2012 |
CN |
201220463373.9 |
Jul 2, 2015 |
CN |
201210223977.0 |
Dec 23, 2015 |
CN |
201510977056.7 |
Claims
1. A dual fuel heating apparatus comprising: a regulator receiving
a gas fuel flow; a first regulator fuel path and a second regulator
fuel path through the regulator; a pressure sensor configured to
detect a pressure of the gas fuel flow in the regulator; a control
module in communication with the pressure sensor; and a regulator
valve operable to open or close the second regulator flow path
depending on a pressure detected by the pressure sensor.
2. The dual fuel heating apparatus of claim 1, wherein the gas fuel
flow is one of a natural gas fuel flow and a propane gas fuel
flow.
3. The dual fuel heating apparatus of claim 2, wherein the pressure
sensor is a normally open switch, closing when a predetermined
pressure is reached.
4. The dual fuel heating apparatus of claim 2, wherein the pressure
sensor determines whether the pressure of the gas fuel flow is
greater than a predetermined pressure, wherein the predetermined
pressure is a pressure greater than a pressure of the natural gas
fuel flow and less than or equal to a pressure of the propane gas
fuel flow.
5. The dual fuel heating apparatus of claim 3, wherein the
regulator valve is a pick and hold solenoid valve.
6. The dual fuel heating apparatus of claim 5, wherein the control
module sends a positive output voltage pulse when the pressure
exceeds the predetermined pressure to move the solenoid valve from
a first position, with the second regulator flow path closed, to a
second position, with the second regulator flow path open.
7. The dual fuel heating apparatus of claim 5, further comprising a
reset button, wherein the reset button, when depressed, is operable
to cause the control module to send a negative output voltage pulse
to move the solenoid valve into the first position, with the second
regulator flow path closed.
8. The dual fuel heating apparatus of claim 1, further comprising:
one or more dual fuel gas valves receiving fuel from the regulator,
each of the one or more dual fuel gas valves having a first gas
valve flow path and a second gas valve flow path for delivering
fuel from the regulator to one or more burners; and a burner valve
operable to open or close the second gas valve flow path depending
on a pressure detected by the pressure sensor.
9. The dual fuel heating apparatus of claim 8, wherein: the gas
fuel flow is one of a natural gas fuel flow and a propane gas fuel
flow; and the pressure sensor determines whether the pressure of
the gas fuel flow is greater than a predetermined pressure, wherein
the predetermined pressure is a pressure greater than a pressure of
the natural gas fuel flow and less than or equal to a pressure of
the propane gas fuel flow.
10. The dual fuel heating apparatus of claim 9, wherein the control
module sends a positive output voltage pulse when the pressure
exceeds the predetermined pressure to move the burner valve from a
first position, with the second gas valve flow path open, to a
second position, with the second gas valve flow path closed.
11. The dual fuel heating apparatus of claim 10, further comprising
a reset button, wherein the reset button, when depressed, is
operable to cause the control module to send a negative output
voltage pulse to move the burner valve into the first position,
with the second gas valve flow path open.
12. A dual fuel heating apparatus comprising: a regulator receiving
a gas fuel flow; a pressure sensor configured to detect a pressure
of the gas fuel flow in the regulator; a control module in
communication with the pressure sensor; one or more dual fuel gas
valves receiving fuel from the regulator, each of the one or more
dual fuel gas valves having a first gas valve flow path and a
second gas valve flow path for delivering fuel from the regulator
to one or more burners; and a burner valve operable to open or
close the second gas valve flow path depending on a pressure
detected by the pressure sensor.
13. The dual fuel heating apparatus of claim 12, wherein: the gas
fuel flow is one of a natural gas fuel flow and a propane gas fuel
flow; and the pressure sensor determines whether the pressure of
the gas fuel flow is greater than a predetermined pressure, wherein
the predetermined pressure is a pressure greater than a pressure of
the natural gas fuel flow and less than or equal to a pressure of
the propane gas fuel flow.
14. The dual fuel heating apparatus of claim 13, wherein the
control module sends a positive output voltage pulse when the
pressure exceeds the predetermined pressure to move the burner
valve from a first position, with the second gas valve flow path
open, to a second position, with the second gas valve flow path
closed.
15. The dual fuel heating apparatus of claim 14, further comprising
a reset button, wherein the reset button, when depressed, is
operable to cause the control module to send a negative output
voltage pulse to move the burner valve into the first position,
with the second gas valve flow path open.
16. The dual fuel heating apparatus of claim 15, wherein the
regulator has a first regulator fuel path and a second regulator
fuel path through the regulator to pass a fuel flow therethrough,
wherein the dual fuel heating apparatus further comprises a
regulator valve operable to open or close the second regulator flow
path depending on a pressure detected by the pressure sensor.
17. A dual fuel heating apparatus comprising: a regulator receiving
a gas fuel flow of either a natural gas fuel flow or a propane gas
fuel flow; a first regulator fuel path and a second regulator fuel
path for delivering fuel through the regulator; a pressure sensor
configured to detect a pressure of the gas fuel flow in the
regulator; a control module in communication with the pressure
sensor; a regulator valve operable to open the second regulator
flow path when the pressure exceeds a predetermined pressure; one
or more dual fuel gas valves receiving fuel from the regulator,
each of the one or more dual fuel gas valves having a first gas
valve flow path and a second gas valve flow path for delivering
fuel from the regulator to one or more burners; and a burner valve
operable to close the second gas valve flow path when the pressure
exceeds the predetermined pressure.
18. The dual fuel heating apparatus of claim 17, wherein the
predetermined pressure is a pressure greater than a pressure of the
natural gas fuel flow and less than or equal to a pressure of the
propane gas fuel flow.
19. The dual fuel heating apparatus of claim 17, wherein the
control module sends a positive output voltage pulse when the
pressure exceeds the predetermined pressure, the positive output
voltage pulse moving the burner valve from a first position, with
the second gas valve flow path open, to a second position, with the
second gas valve flow path closed, and the positive output voltage
pulse moving the regulator valve from a first position, with the
second regulator flow path closed, to a second position, with the
second regulator flow path open.
20. The dual fuel heating apparatus of claim 19, further comprising
a reset button, wherein the reset button, when depressed, is
operable to cause the control module to send a negative output
voltage pulse to move the burner valve into the first position,
with the second gas valve flow path open.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation-in-part of U.S.
application Ser. No. 15/125,373, filed Jun. 7, 2016.
[0002] U.S. application Ser. No. 15/125,373 is a
continuation-in-part of U.S. application Ser. No. 13/791,667, filed
Mar. 8, 2013, now U.S. Pat. No. 9,523,497, which claims priority to
Chinese Pat. Appl. Nos. 201210336108.9 and 201220463373.9, both
filed Sep. 13, 2012. U.S. application Ser. No. 15/125,373 also
claims priority to U.S. Provisional Appl. No. 62/216,807, filed
Sep. 10, 2015. U.S. application Ser. No. 15/125,373 claims priority
to Chinese Pat. Appl. No. 201510977056.7 filed Dec. 23, 2015. U.S.
application Ser. No. 15/125,373 claims priority to U.S. Provisional
Appl. No. 62/322,746, filed Apr. 14, 2016. U.S. application Ser.
No. 15/125,373 is also a continuation-in-part of U.S. application
Ser. No. 13/791,652, filed Mar. 8, 2013, now U.S. Pat. No.
9,739,389, which claims priority to Chinese Pat. Appl. Nos.
201210223977.0, 201220314766.3, 201210224414.3, 201220315268.0 all
filed Jul. 2,2012.
[0003] U.S. application Ser. No. 13/791,667 claims priority to U.S.
Provisional Appl. No. 61/748,044 filed Dec. 31, 2012.
[0004] U.S. application Ser. No. 13/791,652 is a
continuation-in-part of U.S. Pat. application Ser. No. 13/310,664,
filed Dec. 2,2011, now U.S. Pat. No. 8,985,094, which claims
priority to U.S. Provisional Application No. 61/473,714, filed Apr.
8, 2011, and Chinese Pat. Appl. No. 201120401676.3, filed Oct.
20,2011. U.S. application Ser. No. 13/791,652 also claims priority
to U.S. Provisional Application No. 61/748052, filed Dec. 31,
2012.
[0005] The entire contents of all of the above applications are
hereby incorporated by reference and made a part of this
specification. Any and all applications for which a foreign or
domestic priority claim is identified in the Application Data Sheet
as filed with the present application, are hereby incorporated by
reference under 37 CFR 1.57.
BACKGROUND OF THE INVENTION
1. Field of the Invention
[0006] Certain embodiments disclosed herein relate generally to an
apparatus for use in a gas appliance particularly adapted for dual
fuel use. The apparatus can be, can be a part of, and can be used
in or with many different appliances, including, but not limited
to: heaters, boilers, dryers, washing machines, ovens, fireplaces,
stoves, water heaters, barbeques, etc.
2. Description of Prior Art and Related Information
[0007] The following background information may present examples of
specific aspects of the prior art (e.g., without limitation,
approaches, facts, or common wisdom) that, while expected to be
helpful to further educate the reader as to additional aspects of
the prior art, is not to be construed as limiting the present
invention, or any embodiments thereof, to anything stated or
implied therein or inferred thereupon.
[0008] Many varieties of appliances, such as heaters, boilers,
dryers, washing machines, ovens, fireplaces, stoves, and other
heat-producing devices utilize pressurized, combustible fuels. Some
such devices operate with liquid propane, while others operate with
natural gas. However, such devices and certain components thereof
have various limitations and disadvantages. Therefore, there exists
a constant need for improvement in appliances and components to be
used in appliances.
SUMMARY OF THE INVENTION
[0009] Embodiments of the present invention provide a dual fuel
heating apparatus comprising a regulator receiving a gas fuel flow;
a first regulator fuel path and a second regulator fuel path
through the regulator; a pressure sensor configured to detect a
pressure of the gas fuel flow in the regulator; a control module in
communication with the pressure sensor; and a regulator valve
operable to open or close the second regulator flow path depending
on a pressure detected by the pressure sensor.
[0010] Embodiments of the present invention further provide a dual
fuel heating apparatus comprising a regulator receiving a gas fuel
flow; a pressure sensor configured to detect a pressure of the gas
fuel flow in the regulator; a control module in communication with
the pressure sensor; one or more dual fuel gas valves receiving
fuel from the regulator, each of the one or more dual fuel gas
valves having a first gas valve flow path and a second gas valve
flow path for delivering fuel from the regulator to one or more
burners; and a burner valve operable to open or close the second
gas valve flow path depending on a pressure detected by the
pressure sensor.
[0011] Embodiments of the present invention also provide a dual
fuel heating apparatus comprising a regulator receiving a gas fuel
flow of either a natural gas fuel flow or a propane gas fuel flow;
a first regulator fuel path and a second regulator fuel path for
delivering fuel through the regulator; a pressure sensor configured
to detect a pressure of the gas fuel flow in the regulator; a
control module in communication with the pressure sensor; a
regulator valve operable to open the second regulator flow path
when the pressure exceeds a predetermined pressure; one or more
dual fuel gas valves receiving fuel from the regulator, each of the
one or more dual fuel gas valves having a first gas valve flow path
and a second gas valve flow path for delivering fuel from the
regulator to one or more burners; and a burner valve operable to
close the second gas valve flow path when the pressure exceeds the
predetermined pressure.
[0012] These and other features, aspects and advantages of the
present invention will become better understood with reference to
the following drawings, description and claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Some embodiments of the present invention are illustrated as
an example and are not limited by the figures of the accompanying
drawings, in which like references may indicate similar
elements.
[0014] FIG. 1A is a perspective cutaway view of a portion of one
embodiment of a heater configured to operate using either a first
fuel source or a second fuel source;
[0015] FIG. 1B is a perspective cutaway view of the heater of FIG.
1A;
[0016] FIG. 2A is a perspective view of one embodiment of a heater
configured to operate using either a first fuel source or a second
fuel source;
[0017] FIG. 2B is an exploded perspective view of the heater of
FIG. 2A;
[0018] FIG. 2C is a perspective view of one portion of the heater
of FIG. 2A;
[0019] FIG. 3A is perspective view of one embodiment of a heating
source;
[0020] FIG. 3B is a perspective view of the partially disassembled
heating source of FIG. 3A;
[0021] FIG. 3C is a front view of the heating source of FIG.
3A;
[0022] FIG. 3D is a cross-section of the heating source taken alone
line A-A of FIG. 3C;
[0023] FIG. 4 is a top view of the partially disassembled heating
source of FIG. 3B;
[0024] FIG. 4A is a cross-section of a heating source taken along
line A-A of FIG. 4;
[0025] FIGS. 4A1 and 4A2 show the heating source of FIG. 4A in two
different positions;
[0026] FIGS. 4B1 and 4B2 are cross-sections of the heating source
of FIG. 4A taken along line B-B in two different positions;
[0027] FIGS. 5A-D are schematic views of different embodiments of
heating source;
[0028] FIGS. 6A-B are schematic views of different embodiments of
heating sources;
[0029] FIG. 7 is a perspective view of another embodiment of a
partially disassembled heating source;
[0030] FIG. 8 is a front view of the heating source of FIG. 7;
[0031] FIG. 8A is a cross-sectional view of the heating source of
FIG. 8 taken along line A-A;
[0032] FIG. 9 is a top view of the partially disassembled heating
source of FIG. 7;
[0033] FIG. 9A is a cross-section of a heating source taken along
line A-A of FIG. 9;
[0034] FIGS. 9A1 and 9A2 show the heating source of FIG. 9A in two
different positions;
[0035] FIGS. 9B and 9C are cross-sections of the heating source of
FIG. 9A taken along line C-C in two different positions;
[0036] FIGS. 10, 10A, and 10B illustrate perspective views of
different embodiments of heating sources;
[0037] FIGS. 11A and 11B are cross-sections of a heating source in
two different positions;
[0038] FIG. 12 is a cross-section of another heating source;
[0039] FIG. 13 is a cross-section of still another heating
source;
[0040] FIG. 14 shows a perspective view of another embodiment of a
heating source;
[0041] FIG. 15 is a cross-section of the heating source of FIG.
14;
[0042] FIG. 16 is a cross-section of the heating source of FIG. 14
showing the pressure regulators;
[0043] FIG. 17 is a cross-section of the heating source of FIG. 14
showing two valves;
[0044] FIG. 18A is a perspective view of one embodiment of a fuel
selector valve;
[0045] FIG. 18B is a cutaway of the valve of FIG. 18A;
[0046] FIGS. 19A and 19B are cross-sections of the valve of FIG.
18A;
[0047] FIG. 20 is a top view of another embodiment of a fuel
selector valve;
[0048] FIG. 21 is a cross-section of the fuel selector valve of
FIG. 20;
[0049] FIGS. 22A and 22B are cross-sections of the fuel selector
valve of FIG. 20 with an attached fuel source;
[0050] FIG. 23 is a cross-section of the fuel selector valve of
FIG. 20, taken along the line 23-23 of FIG. 22B;
[0051] FIG. 24 is a perspective view of a portion of a heater;
[0052] FIG. 25 is a perspective cross-section view of a valve from
FIG. 24;
[0053] FIG. 25A is a cross-section view of a valve used with a
first fuel at a first fluid pressure;
[0054] FIG. 25B is a cross-section view of the valve of FIG. 25
with the first fuel at a second fluid pressure;
[0055] FIG. 26 is a cross-section view of the valve of FIG. 25 with
a second fuel;
[0056] FIG. 27 is a perspective view of a portion of a heater;
[0057] FIG. 28 is a perspective cross-section view of a valve from
FIG. 27;
[0058] FIG. 29A is a cross-section view of a valve used with a
first fuel at a first fluid pressure;
[0059] FIG. 29B is a cross-section view of the valve of FIG. 28
with the first fuel at a second fluid pressure;
[0060] FIG. 30 is a cross-section view of the valve of FIG. 28 with
a second fuel;
[0061] FIG. 31 is a schematic drawing illustrating a dual fuel
selectable barbeque in a control default condition for delivery of
natural gas to one or more burners;
[0062] FIG. 32A is a schematic drawing illustrating the dual fuel
selectable barbeque of FIG. 31, in a control activated condition
for delivery of propane (LP) gas to one or more burners;
[0063] FIG. 32B illustrates an exemplary positive output voltage
pulse to activate one or more solenoid valves to provide for
delivery of LP gas;
[0064] FIG. 33A is a schematic drawing illustrating the dual fuel
selectable barbeque of FIG. 31, in a control reset condition for
delivery of natural gas to one or more burners after the activation
of a reset button to revert the barbeque to the control default
condition (FIG. 31) from a control activated condition (FIG. 32);
and
[0065] FIG. 33B illustrates an exemplary negative output voltage
pulse to deactivate one or more solenoid valves to provide for
delivery of natural gas.
[0066] Unless otherwise indicated illustrations in the figures are
not necessarily drawn to scale.
[0067] The invention and its various embodiments can now be better
understood by turning to the following detailed description wherein
illustrated embodiments are described. It is to be expressly
understood that the illustrated embodiments are set forth as
examples and not by way of limitations on the invention as
ultimately defined in the claims.
[0068] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS AND BEST
MODE OF INVENTION
[0069] Many varieties of space heaters, fireplaces, stoves, ovens,
boilers, fireplace inserts, gas logs, and other heat-producing
devices employ combustible fuels, such as liquid propane and
natural gas. These devices generally are designed to operate with a
single fuel type at a specific pressure. For example, as one having
skill in the art would appreciate, some gas heaters that are
configured to be installed on a wall or a floor operate with
natural gas at a pressure in a range from about 3 inches of water
column to about 6 inches of water column, while others operate with
liquid propane at a pressure in a range from about 8 inches of
water column to about 12 inches of water column.
[0070] In many instances, the operability of such devices with only
a single fuel source is disadvantageous for distributors,
retailers, and/or consumers. For example, retail stores often try
to predict the demand for natural gas units versus liquid propane
units over a given season, and accordingly stock their shelves
and/or warehouses with a percentage of each variety of device.
Should such predictions prove incorrect, stores can be left with
unsold units when the demand for one type of unit was less than
expected, while some potential customers can be left waiting
through shipping delays or even be turned away empty-handed when
the demand for one type of unit was greater than expected. Either
case can result in financial and other costs to the stores.
Additionally, some consumers can be disappointed to discover that
the styles or models of stoves, fireplaces or other device, with
which they wish to improve their homes, are incompatible with the
fuel sources with which their homes are serviced.
[0071] Certain advantageous embodiments disclosed herein reduce or
eliminate these and other problems associated with devices having
heating sources that operate with only a single type of fuel
source. Furthermore, although certain of the embodiments described
hereafter are presented in the context of vent-free heating
systems, the apparatus and devices disclosed and enabled herein can
benefit a wide variety of other applications and appliances.
[0072] FIG. 1A illustrates one embodiment of a heater 100. The
heater 100 can be a vent-free infrared heater, a vent-free blue
flame heater, or some other variety of heater, such as a direct
vent heater. Some embodiments include boilers, stoves, dryers,
fireplaces, gas logs, etc. Other configurations are also possible
for the heater 100. In many embodiments, the heater 100 is
configured to be mounted to a wall or a floor or to otherwise rest
in a substantially static position. In other embodiments, the
heater 100 is configured to move within a limited range. In still
other embodiments, the heater 100 is portable.
[0073] The heater 100 can comprise a housing 200. The housing 200
can include metal or some other suitable material for providing
structure to the heater 100 without melting or otherwise deforming
in a heated environment. In the illustrated embodiment, the housing
200 comprises a window 220, one or more intake vents 240 and one or
more outlet vents 260. Heated air and/or radiant energy can pass
through the window 220. Air can flow into the heater 100 through
the one or more intake vents 240 and heated air can flow out of the
heater 100 through the outlet vents 260.
[0074] With reference to FIG. 1B, in certain embodiments, the
heater 100 includes a regulator 120. The regulator 120 can be
coupled with an output line or intake line, conduit, or pipe 122.
The intake pipe 122 can be coupled with a heater control valve 130,
which, in some embodiments, includes a knob 132. As illustrated,
the heater control valve 130 is coupled to a fuel supply pipe 124
and an oxygen depletion sensor (ODS) pipe 126, each of which can be
coupled with a fluid flow controller 140. The fluid flow controller
140 can be coupled with a first nozzle line 141, a second nozzle
line 142, a first ODS line 143, and a second ODS line 144. In some
embodiments, the first and the second nozzle lines 141, 142 are
coupled with a nozzle 160, and the first and the second ODS lines
143, 144 are coupled with an ODS 180. In some embodiments, the ODS
comprises a thermocouple 182, which can be coupled with the heater
control valve 130, and an igniter line 184, which can be coupled
with an igniter switch 186. Each of the pipes 122, 124, and 126 and
the lines 141-144 can define a fluid passageway or flow channel
through which a fluid can move or flow.
[0075] In some embodiments, including the illustrated embodiment,
the heater 100 comprises a burner 190. The ODS 180 can be mounted
to the burner 190, as shown. The nozzle 160 can be positioned to
discharge a fluid, which may be a gas, liquid, or combination
thereof into the burner 190. For purposes of brevity, recitation of
the term "gas or liquid" hereafter shall also include the
possibility of a combination of a gas and a liquid. In addition, as
used herein, the term "fluid" is a broad term used in its ordinary
sense, and includes materials or substances capable of fluid flow,
such as gases, liquids, and combinations thereof.
[0076] Where the heater 100 is a dual fuel heater, either a first
or a second fluid is introduced into the heater 100 through the
regulator 120. Still referring to FIG. 1B, the first or the second
fluid proceeds from the regulator 120 through the intake pipe 122
to the heater control valve 130. The heater control valve 130 can
permit a portion of the first or the second fluid to flow into the
fuel supply pipe 124 and permit another portion of the first or the
second fluid to flow into the ODS pipe 126. From the heater control
valve 130, the first or the second fluid can proceed to the fluid
flow controller 140. In many embodiments, the fluid flow controller
140 is configured to channel the respective portions of the first
fluid from the fuel supply pipe 124 to the first nozzle line 141
and from the ODS pipe 126 to the first ODS line 143 when the fluid
flow controller 140 is in a first state, and is configured to
channel the respective portions of the second fluid from the fuel
supply pipe 124 to the second nozzle line 142 and from the ODS pipe
126 to the second ODS line 144 when the fluid flow controller 140
is in a second state.
[0077] In certain embodiments, when the fluid flow controller 140
is in the first state, a portion of the first fluid proceeds
through the first nozzle line 141, through the nozzle 160 and is
delivered to the burner 190, and a portion of the first fluid
proceeds through the first ODS line 143 to the ODS 180. Similarly,
when the fluid flow controller 140 is in the second state, a
portion of the second fluid proceeds through the nozzle 160 and
another portion proceeds to the ODS 180. As discussed in more
detail below, other configurations are also possible.
[0078] FIGS. 2A-2C illustrate another embodiment of a heater 100'
such as a BBQ grill. In some embodiments, the heater 100' is
configured to be mounted to a wall or a floor or to otherwise rest
in a substantially static position. In other embodiments, the
[0079] heater 100' is configured to move within a limited range. In
still other embodiments, the heater 100' is portable.
[0080] With reference to FIG. 2A, the heater can comprise a housing
200'. The housing 200' can include metal or some other suitable
material for providing structure to the heater 100' without melting
or otherwise deforming in a heated environment. In the illustrated
embodiment, the housing 200' comprises a cover 250, which can
preferably be moved from a closed to an open position, allowing
heated air and/or radiant energy to pass out of the housing 200'.
In some embodiments, a grill 170 can be positioned within or near
the housing.
[0081] In some embodiments, the heater 100' can also include a
frame 150 attached to the housing. The frame can support and/or
elevate the housing. The frame can also include one or more wheels
152, which can make it easier to move the heater 100'.
[0082] FIG. 2B illustrates an exploded view of the heater 100'. As
illustrated, the heater can include a fuel selector valve 3,
embodiments of which are described in more detail below. Where the
heater 100' is a dual fuel heater, either a first or second fuel
can be introduced into the heater 100' through the fuel selector
valve 3. The fuel can flow to one or more burners 190'. In some
embodiments, the heater 100' can have one or more different types
and/or sizes of burners. As shown, the heater 100' has a number of
burners within the BBQ grill, as well as a side burner. In some
embodiments, one or more of the burners can have a control valve
130' associated with it, and/or have a burner cover 192. In some
embodiments a control valve can include a knob 132'.
[0083] FIG. 2C illustrates a more detailed view of embodiments of a
fuel selector valve 3 and burners 190'. As illustrated, in some
embodiments the fuel selector valve 3 can have a first outlet 18
that leads to a first flow path 71, and a second outlet 19 that
leads to a second flow path 73. The first and second flow paths can
intersect at a common or shared flow path 75. In some embodiments,
the second flow path can pass through a pressure regulator 16
before joining with the first flow path.
[0084] A heating assembly or heating source 10 that can be used
with the heater 100, 100' or other gas appliances, will now be
described. The heating source 10 can be configured such that the
installer of the gas appliance can connect the assembly to one of
two fuels, such as either a supply of natural gas (NG) or a supply
of propane (LP) and the assembly will desirably operate in the
standard mode (with respect to efficiency and flame size and color)
for either gas.
[0085] Looking at FIGS. 3A-4B2, a heating source 10 can comprise a
fuel selector valve 3. The fuel selector valve 3 can be used for
selecting between two different fuels and for setting certain
parameters, such as one or more flow paths, and/or a setting on one
or more pressure regulators based on the desired and selected fuel.
The fuel selector valve 3 can have a first mode configured to
direct a flow of a first fuel (such as NG) in a first path through
the fuel selector valve 3 and a second mode configured to direct a
flow of a second fuel (such as LP) in a second path through the
fuel selector valve 3.
[0086] The fuel selector valve 3 can further comprise first and
second fuel source connections or hook-ups 12, 14. The fuel
selector valve 3 can connect to one of two different fuel sources,
each fuel source having a different type of fuel therein. For
example, one fuel source can be a cylinder of LP and another fuel
source can be a NG fuel line in a house, connected to a city gas
line. The first and second fuel source connections 12, 14 can
comprise any type of connection such as a threaded connection, a
locking connection, an advance and twist type connection, etc.
[0087] An embodiment of a fuel selector valve 3 is shown in FIG. 3A
with a housing 11 and a cover 20. The cover has been removed in
FIG. 3B revealing some of the internal components of the
illustrated embodiment. A pressure regulator 16 is positioned
within the housing such that fluid entering the fuel selector valve
3 via either the first or second fuel source connection 12, 14 can
be directed to the pressure regulator 16. FIG. 3D shows a
cross-section of the selector valve 3 showing the flow path between
the fuel source connections and the pressure regulator. Fuel from
the pressure regulator 16 can then flow to the outlet 18, as can
also be seen with reference to FIG. 3D. The fuel can then flow to
various other components, such as a burner. In some embodiments,
the fuel selector valve 3 has two separate pressure regulators such
that each fuel source connection directs fuel to a specific
pressure regulator which can then travel to the outlet.
[0088] The fuel selector valve 3 can be configured to select one or
more flow paths through the fuel selector valve 3 and/or to set a
parameter of the fuel selector valve. For example, the fuel
selector valve 3 can include one or more valves, where the position
of the valve can determine one or more flow paths through the fuel
selector valve 3, such as a fluid exit or entry pathway. As another
example, the fuel selector valve 3 can control certain parameters
of the pressure regulator 16.
[0089] With reference to FIGS. 4-4A2, it can be seen that the fuel
selector valve 3 can include one or more actuation members 22, 24.
The actuation members 22, 24 can be used for many purposes such as
to select one or more flow paths through the fuel selector valve 3
and/or to set a parameter of the fuel selector valve. The one or
more actuation members can be provided in the fuel selector valve 3
in many ways. As shown, the actuation members are spring loaded
rods that can be advanced in a linear motion. An actuation member
can be one or more of a linkage, a rod, an electric or mechanical
button, a pin, a slider, a gear, a cam, etc.
[0090] As shown, the actuation member 22 has an end 26 positioned
within the first fuel source connection 12. A connector 30 can be
attached to the first fuel source connection 12 by advancing the
connector into the first fuel source connection 12. This can force
the actuation member end 26 into the housing of the fuel selector
valve 3. This force then counteracts a spring force provided by a
spring 32 to open a valve 34.
[0091] FIG. 4A1 shows the open valve 34 with the connector 30
attached to the first fuel source connection 12. The connector 30
can be part of a fuel source to provide fuel to the heater assembly
10. With the valve 34 in the open position, fuel from the fuel
source can flow through the connector 30 and into the fuel selector
valve 3. In particular, as shown, fuel can flow into the first fuel
source connection 12, then to the pressure regulator 16 and finally
out of the fuel selector valve 3 by way of outlet 18 (FIG.
3A-3B).
[0092] Alternatively, the connector 30 can be connected to the
second fuel source connection 14. This can open the valve 36 by
pressing on the end 28 of the second actuation member 24. Fuel can
then flow from the fuel source through the connector 30 into the
fuel source connection 14. The fuel can then flow to the pressure
regulator 16 and out through outlet 18.
[0093] The presence of two valves 34, 36, one at each fuel source
connection 12, 14, can prevent fuel from exiting the fuel selector
valve 3 undesirably, as well as preventing other undesirable
materials from entering the fuel selector valve 3. In some
embodiments, the fuel selector valve can utilize a cap or plug to
block the unused fuel source connection. This may be in addition to
or instead of one or more valves at the fuel source connections.
For example, in some embodiments the actuation member 24 does not
include a valve at the fuel source connection 14.
[0094] In addition to or instead of providing a valve 36 at the
inlet or fuel source connection 14, the actuation member 24 can be
in a position to control a parameter of the pressure regulator 16.
Referring back to FIGS. 3B and 4, it can be seen that an arm 38
extends between the actuation member 24 and the pressure regulator
16. The actuation member 24 can act on the arm, determining the
position of the arm 38. This position can be seen by comparing the
position of the arm 38 in FIGS. 4A1 and 4A2, as well as 4B1 and
4B2. The position of the arm 38 can then determine the height (H1,
H3) of the spring 40 within the pressure regulator. That is, though
the length of the spring is constant, the height H1 of the spring
when the diaphragm is in a first position shown in FIG. 4B1 is
greater than the height H3 of the spring when the spring is in the
position shown in FIG. 4B2. As shown, the arm 38 contacts a cap 41
that is connected to the spring 40. The height of the spring 40 can
be a factor in determining the force required to move the diaphragm
42. The spring height can be used to preset the pressure settings
of the pressure regulator. Thus, the spring can be tensioned to
regulate the pressure of the incoming fuel depending on whether the
first or second fuel source is utilized.
[0095] In another embodiment, the actuation member contacts the
pressure regulator 16 directly, such as at the cap 41, without the
assistance of an arm or other device to set the regulating pressure
of the pressure regulator.
[0096] The pressure regulator 16 can be set to a first position as
shown in FIG. 4B1. The initial position can allow for flow control
of the first fuel at an initial predetermined pressure or pressure
range. The initial predetermined pressure or pressure range is
lower than the second predetermined pressure or pressure range
based on the second position as shown in FIG. 4B2. For example, the
predetermined selected pressure can depend at least in part on the
particular fuel used, and may desirably provide for safe and
efficient fuel combustion and reduce, mitigate, or minimize
undesirable emissions and pollution. In some embodiments, the first
pressure can be set to be within the range of about 3 inches of
water column to about 6 inches of water column, including all
values and subranges therebetween. In some embodiments, the
threshold or flow-terminating pressure is about 3 inches of water
column, about 4 inches of water column, about 5 inches of water
column, or about 6 inches of water column.
[0097] In some embodiments, the second pressure can be set to be
within the range of about 8 inches of water column to about 12
inches of water column, including all values and sub-ranges
therebetween. In some embodiments, the second threshold or flow
terminating pressure is about equal to 8 inches of water column,
about 9 inches of water column, about 10 inches of water column,
about 11 inches of water column, or about 12 inches of water
column.
[0098] When natural gas is the first fuel and propane is the second
fuel, the first pressure, pressure range and threshold pressure are
less than the second pressure, pressure range and threshold
pressure. Stated differently, in some embodiments, when natural gas
is the first fuel and propane is the second fuel, the second
pressure, pressure range and threshold pressure are greater than
the first pressure, pressure range and threshold pressure.
[0099] The pressure regulator 16 can function in a similar manner
to that discussed in U.S. application Ser. No. 11/443,484, filed
May 30, 2006, now U.S. Pat. No. 7,607,426, incorporated herein by
reference and made a part of this specification; with particular
reference to the discussion on pressure regulators at columns 3-9
and FIGS. 3-7 of the issued patent.
[0100] The pressure settings can be further adjusted by tensioning
of a screw or other device 41 that allows for flow control of the
fuel at a predetermined pressure or pressure range and selectively
maintains an orifice open so that the fuel can flow through
spring-loaded valve or valve assembly of the pressure regulator. If
the pressure exceeds a threshold pressure, a plunger seat 43 can be
pushed towards a seal ring 45 to seal off the orifice, thereby
closing the pressure regulator.
[0101] The fuel selector valve 3 can permit the flow of fuel from
one or more pressure regulators, through the fuel selector valve 3
and into additional components. The additional components can be,
for example, the heater control valve 130, the fluid flow
controller 140, the nozzle 160, etc. In some embodiments, the
additional components can comprise a control valve which comprises
at least one of a manual valve, a thermostat valve, an AC solenoid,
a DC solenoid and a flame adjustment motor. In various embodiments,
the additional components mayor may not comprise part of the
heating source 10. The additional components can be configured to
use the fuel, such as for combustion, and/or to direct one or more
lines of fuel to other uses or areas of the heater 100, 100' or
other appliance.
[0102] Returning now to FIGS. 4A1-4B2, the functioning of the arm
38 and the actuation member 24 will be described in more detail.
The actuation member 24 can have a varying or undulating surface
that engages the arm 38. The arm 38 can move with the varying
surface thereby changing the position of the arm 38. The arm 38 can
be made from a resilient flexible material, such as metal or
plastic, but can also be rigid. The arm as shown is a flexible
material that can be moved and bent between positions with a
resiliency to return to an unbent or less bent position. In other
embodiments, the arm can be a linkage, a pinned rotating arm, a
member suspended between the actuation member and the pressure
regulator, etc. The arm 38 can be elongate, have spring qualities,
be biased upwards, be a bent metal arm or beam, etc.
[0103] The actuation member 24 can have sections of different
heights (H2, H4). For example, the actuation member 24 can include
flat spots or sections with a diameter different than adjacent
sections. As can be seen, the actuation member includes a flat
portion 44 with a transition portion 46 that extends between the
initial outer diameter of the cylindrical rod and the flat portion
44. Alternatively, the portion 44 can have smaller diameter than
the initial outer diameter of the rod. The rod can extend along a
longitudinal axis and have a plurality of longitudinal
cross-sections of different shapes. The actuation member 24 can be
a type of cam and can also be shapes, besides cylindrical, and can
have a surface that varies to provide different heights to the arm
38 for engaging the arm and setting the pressure at the pressure
regulator 16.
[0104] Looking now to FIG. 5A, a schematic diagram of a heating
source with a fuel selector valve 3 is illustrated. The illustrated
fuel selector valve 3 can be similar to that described above with
reference to FIGS. 3A-4B2. A fuel source can be connected to the
fuel selector valve 3 via one of the fuel source connections 12,
14. The act of connecting the fuel source to the fuel selector
valve 3 can set the pressure regulator to the desired pressure if
it is not already at the desired pressure. Thus, selecting the
proper fuel source connection can determine and sometimes set the
pressure at the pressure regulator. It will be understood that one
fuel source connection may allow fluid to flow through a default or
preset path while the other fuel source connection may change the
path including changing other characteristics of the system along
the path such as the pressure regulator setting. In some
embodiments, both fuel source connections may change the path
and/or other characteristics.
[0105] The fuel selector valve 3 can permit the flow of fuel from
the pressure regulator 16 through the fuel selector valve 3 and
then into additional components. The additional components can be,
for example, the heater control valve 130, the fluid flow
controller 140, the nozzle 160, etc. In some embodiments, the
additional components can comprise a control valve which comprises
at least one of a manual valve, a thermostat valve, an AC solenoid,
a DC solenoid and a flame adjustment motor. In various embodiments,
the additional components mayor may not comprise part of the
heating source 10. The additional components can be configured to
use the fuel, such as for combustion, and/or to direct one or more
lines of fuel to other uses or areas of the heater 100, 100' or
other appliance.
[0106] FIG. 5B illustrates a schematic diagram of another
embodiment of a heating source with a fuel selector valve 3. The
illustrated fuel selector valve can be similar to that described
below with reference to FIGS. 18A-19B. A fuel source can be
connected to the fuel selector valve 3 via one of the fuel source
connections 12, 14. The act of connecting the fuel source to the
fuel selector valve 3 can determine whether a flow path from either
fuel source connection 12, 14 is open or closed.
[0107] The fuel selector valve 3 can be arranged such that fluid
flowing from the second fuel source connection 14 passes through a
pressure regulator through which fluid flowing from the first fuel
source connection 12 does not pass. In some embodiments, as is
illustrated, the pressure regulator can be outside of the fuel
selector valve, although in some embodiments it can be within it.
As illustrated, fluid flowing through either fuel connection source
can ultimately end up in the same line, from which the fluid can
flow into additional components. As above, the additional
components can be, for example, a heater control valve 130, a fluid
flow controller 140, a nozzle 160, etc. In some embodiments, the
additional components can comprise a control valve which comprises
at least one of a manual valve, a thermostat valve, an AC solenoid,
a DC solenoid and a flame adjustment motor. In various embodiments,
the additional components mayor may not comprise part of the
heating source 10. The additional components can be configured to
use the fuel, such as for combustion, and/or to direct one or more
lines of fuel to other uses or areas of the heater 100, 100' or
other appliance.
[0108] In further embodiments, the fuel selector valve 3 can be
arranged such that fluid flowing from the second fuel source
connection 14 passes through a first pressure regulator and fluid
flowing from the first fuel source connection 12 passes through a
second pressure regulator. The pressure regulators can be either
inside of or outside of the fuel selector valve. Similar to that
illustrated in FIG. 5B, fluid flowing through either fuel
connection source can ultimately end up in the same line, from
which the fluid can flow into additional components.
[0109] FIGS. 5C and 5D show additional embodiments of heating
source where selecting the fuel source connection can set
additional parameters. The fuel selector valve of FIG. 5C includes
a valve 48. The valve 48 has one inlet and two outlets, such that
one outlet can be closed while the other is open. The valve 48 can
have an initial position where one of the outlets is open and a
secondary position where the other outlet is open. The selection of
the fuel source connection can determine whether the valve is in
the initial or secondary position. For example, selecting the first
fuel source connection 12 can allow fuel flow through the initial
configuration of the heating source, while selecting the second
fuel source connection 14 can move the pressure regulator 16 and
the valve 48 to their secondary configurations.
[0110] In other embodiments, the two outlets can both have separate
open and closed positions with separate valves located at each
outlet. Thus, the valve 48 can comprise two valves. The selection
of the fuel source connection can determine which valve is opened.
For example, selecting the first fuel source connection 12 can
allow fuel flow through the initial configuration of the pressure
regulator and can open the first valve at one of the outlets.
Selecting the second fuel source connection 14 can move the
pressure regulator 16 to its secondary configuration and open the
second valve at the other of the outlets.
[0111] FIG. 5D illustrates a fuel selector valve having two valves
48, 50. In addition to setting the pressure regulator, selecting
the fuel source connection can also determine how the fuel flows
through the valves 48, 50. For example, one selection can allow the
fuel to follow the upward arrows, while the other selection can
allow the fuel to follow the downward arrows. In addition, the fuel
selector valve can also direct the fuel out of the fuel selector
valve after the pressure regulator 16, and then receive the fuel
again. The fuel can be directed to other components 52 that then
direct the fuel, or some of the fuel back to the fuel selector
valve. It should be understood that the fuel selector valve show in
FIG. 5C can also include other components 52 between the pressure
regulator 16 and the valve 48. The heating source can include the
fuel selector valve and one or more of the other components.
[0112] The other component 52 can preferably be a control valve. In
some embodiments, the control valve can comprise at least one of a
manual valve, a thermostat valve, an AC solenoid, a DC solenoid and
a flame adjustment motor. For example, the control valve 52 can
include two solenoids. Each solenoid can control the flow of fuel
to one of the valves 48, 50. The valves can then direct fuel to
additional components such as a pilot light or oxygen depletion
sensor and to a nozzle. In some embodiments, each line leaving the
valve can be configured to direct a particular type of fuel to a
component configured specific to that type of fuel. For example,
one valve may have two lines with each line connected to a
different nozzle. The two nozzles can each have a different sized
orifice and/or air hole and each can be configured for a particular
fuel type.
[0113] Turning now to FIGS. 6A and 6B, additional embodiments of
heating sources are shown. The heating source of FIG. 6A is very
similar to that shown in FIG. 5D. One difference is that the fuel
selector valve of FIG. 6A includes two pressure regulators 16'. The
two pressure regulators 16' can be preset to a particular pressure
or pressure range. As there is only one line leading to each
pressure regulator, the pressure regulators do not need to be
changeable between two different pressures as discussed above with
reference to FIGS. 5A-5D. In addition, similar to FIGS. 5C and 5D,
either one of the fuel source connections 12, 14 or both can
determine and/or change a path through the fuel selector valve. For
example, each of valves 48 and 50 can comprise one valve or two
valves as described above.
[0114] FIG. 6B shows another embodiment where the control valve 52
returns two flows of fuel to the fuel selector valve. One flow of
fuel is directed to a valve 48 and one flow passes through the fuel
selector valve but does not have separate paths dependent on the
fuel type.
[0115] In each of the embodiments shown in FIGS. 5A-6B, the fuel
selector valve may also include valves in or near the fuel source
connections 12, 14. This can help to control the flow of fuel into
the fuel selector valve as has been previously discussed.
[0116] Turning now to FIGS. 7-9C, another embodiment of heating
source 10 is shown. It will be understood that parts of this
heating source can function in a similar manner to the heating
source shown and described with reference to FIGS. 3A-4B2. Thus,
similar reference numbers are used. For example, the pressure
regulator 16 functions in the same way in both illustrated
embodiments. In addition, the embodiment of FIGS. 7-9C is
conceptually similar to the schematic diagram shown and described
with reference to FIG. 5D.
[0117] Looking to FIG. 7, it can be seen that a control valve 52
having two solenoids 54, 56 is connected to the side of the fuel
selector valve 3. The fuel selector valve also includes two valves
48, 50. FIGS. 8 and 8A show the fuel selector valve 3 in relation
to the control valve 52. A fluid, such as fuel, can flow from one
of the fuel source connections 12, 14 flows through the pressure
regulator 16 to the control valve 52. The fluid flow will first
encounter the first solenoid 54. The first solenoid 54 has a valve
58 that can control flow past the first solenoid 54. When the valve
58 is open, fluid can flow to both the second solenoid 56 and to
the valve 48. The second solenoid 56 also has a valve 60 which can
open or close to control fuel flow to the valve 50. In some
embodiments, the valve 48 directs fuel to a pilot light or oxygen
depletion sensor and the valve 50 directs fuel to a nozzle at a
burner. Thus, it may be desirable direct fuel to be ignited at the
pilot light first, before igniting or directing fuel to the burner.
The control valve 52 can also control the amount of fuel flowing to
burner. In some embodiments, the control valve can also include a
manual valve that allows for manual as well as, or instead of,
automatic control by an electric valve, such as the two solenoids
shown.
[0118] As discussed, selecting one of the first and second fuel
source connections 12, 14 can determine the flow path through the
heating source. In particular, the actuation member 24 can move the
valves 48 and 50 from an initial position to a secondary position
in a manner similar to that described above with reference to the
pressure regulator.
[0119] The fuel selector valve 3 can be used for selecting between
two different fuels and for setting certain parameters, such as one
or more flow paths, and/or a setting on one or more pressure
regulators based on the desired and selected fuel. The fuel
selector valve 3 can have a first mode configured to direct a flow
of a first fuel (such as NG) in a first path through the fuel
selector valve 3 and a second mode configured to direct a flow of a
second fuel (such as LP) in a second path through the fuel selector
valve 3.
[0120] The fuel selector valve 3 can further comprise first and
second fuel source connections or hook-ups 12, 14. The fuel
selector valve 3 can connect to one of two different fuel sources,
each fuel source having a different type of fuel therein.
[0121] A pressure regulator 16 is positioned within the housing
such that fluid entering the fuel selector valve 3 via either the
first or second fuel source connection 12, 14 can be directed to
the pressure regulator 16. Fuel from the pressure regulator 16 can
then flow to the control valve 52 as discussed above. In some
embodiments, the fuel selector valve 3 has two separate pressure
regulators such that each fuel source connection directs fuel to a
specific pressure regulator.
[0122] The fuel selector valve 3 can be configured to select one or
more flow paths through the fuel selector valve 3 and/or to set a
parameter of the fuel selector valve. For example, the fuel
selector valve 3 may include two valves 48, 50, where the position
of the valve can determine a flow path through the fuel selector
valve 3. The fuel selector valve 3 can also control certain
parameters of the pressure regulator 16.
[0123] With reference to FIGS. 9-9A2, it can be seen that the fuel
selector valve 3 can include one or more actuation members 22, 24.
The actuation members 22, 24 can be used for many purposes such as
to select one or more flow paths through the fuel selector valve 3
and/or to set a parameter of the fuel selector valve. As shown, the
actuation members are spring loaded rods that can be advanced in a
linear motion.
[0124] The illustrated actuation member 22 has an end 26 positioned
within the first fuel source connection 12. A connector 30 can be
attached to the first fuel source connection 12 by advancing the
connector into the first fuel source connection 12. This can force
the actuation member end 26 into the housing of the fuel selector
valve 3. This force then counteracts a spring force provided by a
spring 32 to open a valve 34.
[0125] FIG. 9A1 shows the open valve 34 with the connector 30
attached to the first fuel source connection 12. The connector 30
can be part of a fuel source to provide fuel to the heater assembly
10. With the valve 34 in the open position, fuel from the fuel
source can flow into the first fuel source connection 12, to the
pressure regulator 16, then to the control valve 52 and then to one
or both of the valves 48, 50 before finally leaving the fuel
selector valve 3.
[0126] Alternatively, the connector 30 can be connected to the
second fuel source connection 14 as shown in FIG. 9A2. This can
open the valve 36 by pressing on the end 28 of the second actuation
member 24. Fuel can then flow from the fuel source through the
connector 30 into the fuel selector valve 3 and through the fuel
selector valve 3 in the same manner as mentioned above.
[0127] The presence of two valves 34, 36, one at each fuel source
connection 12, 14, can prevent fuel from exiting the fuel selector
valve 3 undesirably, as well as preventing other undesirable
materials from entering the fuel selector valve 3. In some
embodiments, the fuel selector valve can utilize a cap or plug to
block the unused fuel source connection. This may be in addition to
or instead of one or more valves at the fuel source connections.
For example, in some embodiments the actuation member 24 does not
include a valve at the fuel source connection 14.
[0128] In addition to, or instead of, providing a valve 36 at the
inlet or fuel source connection 14, the actuation member 24 can be
in a position to control a parameter of the pressure regulator 16,
such as by an arm 38 that extends between the actuation member 24
and the pressure regulator 16. The actuation member 24 can act on
the arm, determining the position of the arm 38. The position of
the arm 38 can then determine the height of the spring 40 within
the pressure regulator. The height of the spring 40 can be a factor
in determining the force required to move the diaphragm 42. The
spring height can be used to set the pressure of the fluid flowing
through the pressure regulator.
[0129] In addition to controlling the pressure regulator, the
actuation member 24 can also control one or more valves, including
valves 48, 50. The actuation member 24 can have a varying or
undulating surface that engages the arms 38 as shown in FIGS.
9A1-9A2. The arms 38 can move with the varying surface thereby
changing the position of the arms 38.
[0130] The actuation member 24 can include flat spots or sections
with a diameter different than adjacent sections. As can be seen,
the actuation member includes flat portions 44 with transition
portions 46 that extend between the initial outer diameter of the
cylindrical rod and the flat portions 44. Alternatively, the
portion 44 can have a smaller diameter than the initial outer
diameter of the rod. The rod can extend along a longitudinal axis
and have a plurality of longitudinal cross-sections of different
shapes. The actuation member 24 can be a type of cam and can also
be shapes, besides cylindrical, and can have a surface that varies
to provide different heights to the arms 38 for engaging the
arms.
[0131] Looking now to FIGS. 9B and 9C, an embodiment of a valve 48
is shown. The valve 50 can function in a similar manner to that as
will be described with reference to valve 48. The valves can also
function in other ways as will be understood by one of skill in the
art.
[0132] Valve 48 is shown having a valve body 62 that can control
the fluid flow path and whether the flow exits the valve 48 through
one of two outlets 70, 72. The valve body 62 can be seated against
one of two different ledges 64, 66 surrounding an opening to either
open or close the pathway 71, 73 to the respective outlet 70, 72.
Fluid can enter the valve, such as from the control valve 52 as
indicated by the dotted line. The position of the valve body 62
within the valve 48 can then determine whether the fluid exits via
the first outlet 70 or the second outlet 72.
[0133] The valve body 62 can have a spring 32 to bias the valve
body towards a first position as shown in FIG. 9B. In the first
position, the outlet 72 is open and outlet 70 is closed, thus fluid
will flow through flow path 73. In the second position shown in
FIG. 9C, the outlet 72 is closed and the outlet 70 is open, thus
fluid will flow through flow path 71. The valve body 62 can be made
of one or more materials. The valve body 62 may include a solid
core with a rubber or other elastic material to form the valve seat
with the respective first or second ledge 64, 66.
[0134] The valve body 62 can also engage the arm 38 so that the
position of the valve body 62 is controlled by the actuation member
24. As mentioned with respect to the pressure regulator, in some
embodiments, the actuation member 24 can contact the valve body
directly, without the use of an arm 38. Also, the arm 38 can take
any form to allow the actuation member to control the position of
the valve body within the valve 48.
[0135] The valve 48 can also include a diaphragm 68. The diaphragm
68 can be different from the diaphragm 42 in the pressure regulator
(FIGS. 4B1 and 4B2) in that the diaphragm 68 is generally not used
for pressure regulation. The diaphragm 68 can be a sheet of a
flexible material anchored at its periphery that is most often
round in shape. It can serve as a flexible barrier that allows the
valve to be actuated from the outside, while sealing the valve body
62 and keeping the contents, namely the fuel, within the fuel
selector valve.
[0136] FIG. 10 illustrates a perspective view of the heating source
10 where both the first valve 48 and the second valve 50 have two
outlets and function in similar manners. Thus, the heating source
10, valve 48 and valve 50 can all function in the same or a similar
manner as that described with respect to FIGS. 7-9C. FIGS. 10A and
10B show heating sources where the first valve 48 is different from
the second valve 50. The valve 48 can be the same or similar to
that described above and the valve 50 can be the same or similar to
the valves described in more detail below. Further, in some
embodiments the heating source can include only one valve. The
heating source may still include one or more outlets at the area
that does not include a valve.
[0137] FIGS. 11A and 11B show an embodiment of a valve 50 in
cross-section. As one example, the illustrated valve 50 could be
used in the heating source of FIG. 10A. The valve 50 has two
channels or flow paths 78, 80 and a valve body 62' that is
positioned to open and close only one of the flow paths 80. Thus,
the flow path 78 remains open so that when fuel is flowing from the
control valve 52 to the valve 50, it will flow through flow path 78
and it may also flow through flow path 80. FIG. 11A shows the valve
50 with the valve body 62' spaced away from the ledge 66 so that
the valve and the flow path 80 are open. FIG. 11B shows the valve
body 62' seated at the ledge 66 so that the valve and the flow path
80 are closed. The flow path 78 remains open in both figures. There
is also only one outlet 74 so both flow paths pass through the
outlet 74.
[0138] FIG. 12 shows the valve 50 of FIG. 11A with a nozzle
assembly 76 positioned within the outlet 74. The nozzle assembly 76
has a center orifice 82 and an outer orifice 84. The flow path 78
is in fluid communication with the center orifice 82 and the flow
path 80 is in fluid communication with the outer orifice 84. The
orifices can be single orifices, or a plurality of orifices. For
example, the nozzle can have a single center orifice 82 and a
plurality of orifices that surround the center orifice to make up
the outer orifice 84.
[0139] FIG. 13 illustrates another embodiment of the fuel selector
valve which is conceptually similar to the schematic diagram shown
and described with reference to FIG. 6B. The fuel selector valve
can have a valve 48 and then a separate flow path 86. Thus, a
control valve 52 can return two flows of fuel to the fuel selector
valve, one of which to the valve 48 and one to the flow path 86.
The fuel in the flow path 86 can flow through the fuel selector
valve without being controlled by have a valve 50 or without being
directed down separate paths dependent on the fuel type. The fuel
is simply directed out of the fuel selector valve.
[0140] Turning now to FIGS. 14-17, another embodiment of a heating
source is shown which is conceptually similar to the schematic
diagram shown and described with reference to FIG. 6A. As can best
be seen in FIG. 15, both the first actuation member 22' and the
second actuation member 24' are used to control valves at the
inlets, but also the valves at the outlets of the fuel selector
valve. In addition, the fuel selector valve includes two pressure
regulators 16', 16'' as can be seen in FIG. 16. The two pressure
regulators 16', 16''' can be preset to a particular pressure or
pressure range and each of the fuel source connections 12, 14 can
direct fluid flow to a specific pressure regulator. Thus, the
pressure regulators do not need to be changeable between two
different pressures as discussed previously.
[0141] The pressure settings of each pressure regulator 16', 16''
can be independently adjusted by tensioning of a screw or other
device 41 that allows for flow control of the fuel at a
predetermined pressure or pressure range and selectively maintains
an orifice open so that the fuel can flow through spring-loaded
valve or valve assembly of the pressure regulator. If the pressure
exceeds a threshold pressure, a plunger seat 43 can be pushed
towards a seal ring 45 to seal off the orifice, thereby closing the
pressure regulator.
[0142] Turning now to FIG. 17, one example of a valve 48' is shown.
The valve 48' can comprise two separate valves that are each
separately controllable by either the first actuation member 22' or
the second actuation member 24'. The selection of the fuel source
connection can determine which valve is opened. For example,
selecting the first fuel source connection 12 and advancing the
first actuation member 22' can allow fuel flow through a preset
pressure regulator 16'' and can move the first valve body 62' to
the open position to allow flow through the outlet 70. Selecting
the second fuel source connection 14 and advancing the second
actuation member 24' can allow fuel flow through a preset pressure
regulator 16' and can move the second valve body 62'' to the open
position to allow flow through the outlet 72. It is anticipated
that only one of the fuel source connections will be selected,
though it is possible that in certain configurations, both fuel
source connections could be in use.
[0143] The fuel selector valve may also include valves in or near
the fuel source connections 12, 14. This can help to control the
flow of fuel into the fuel selector valve as has been previously
discussed.
[0144] As before, it will be understood that the valve 50' can be
similar to valve 48' or can have a different configuration. For
example, the valve 50' may have one or two outlets and it may
include a nozzle in the one outlet.
[0145] Turning now to FIGS. 18A-19B, another embodiment of an inlet
or fuel selector valve 3 is shown. It will be understood that parts
of this valve can function in a similar manner to the heating
sources and valves shown and described above. Thus, similar
reference numbers are used. In addition, the embodiment of FIGS.
18A-19B is conceptually similar to and can be used in arrangements
illustrated in the schematic diagram shown and described with
reference to FIG. 5B, although it is not limited to such
arrangements.
[0146] FIG. 18A illustrates a perspective view of a fuel selector
valve 3. The valve can include a first inlet 12, a second inlet 14,
a first outlet 18, and a second outlet 19. As illustrated in FIG.
18B, a cutaway of the image of FIG. 18A, in some embodiments the
first inlet can correspond with the first outlet and the second
inlet can correspond with the second outlet. The first inlet can
connect to the first outlet via a first flow path 71, and the
second inlet can connect to the second outlet via a second flow
path 73. In some embodiments, the first and second flow paths can
be distinct within the valve, such that there is no fluid
communication between the first and second flow paths within the
valve 3.
[0147] With continuing reference to FIG. 18B, the fuel selector
valve 3 can include an actuation member 22. The actuation member
preferably extends from the first flow path 71 to the second flow
path 73. In some embodiments, as illustrated, the actuation member
can comprise a rod 22. In some embodiments, the actuation member
can comprise a first valve member 34 and a second valve member 36.
With two valve members, the actuation member can allow for one flow
path to be open while the other is closed. The actuation member can
be biased to a first position where at least one of the valve
members is seated to close the flow path. Advancing the actuation
member can open a seated valve member and ensure that the other
valve member is closed.
[0148] In some embodiments, the first valve member can include a
sealing section 35 that can be configured to seat against a first
ledge 64, closing the first outlet 18 and blocking or substantially
blocking fluid communication along the first flow path 71 between
the first inlet 12 and the first outlet 18. Similarly, the second
valve member can include a sealing section 37 that can be
configured to seat against a second ledge 66, closing the second
outlet 19 and blocking or substantially blocking fluid
communication along the second flow path 73 between the second
inlet 14 and the second outlet 19.
[0149] In some embodiments, the actuation member can have a first
position in which the second valve member 36 closes the second flow
path 73 (i.e., by closing or substantially closing the second inlet
14 and/or the second outlet 19). The first flow path 71 can be open
with the actuation member in the first position. The actuation
member can also have a second position in which the first valve
member 34 closes the first flow path 71 (i.e., by closing or
substantially closing the first inlet 12 and/or the first outlet
18). The second flow path 73 can be open with the actuation member
in the first position.
[0150] In some embodiments, the actuation member 22 can comprise a
first biasing member 32, such as a spring, configured to bias the
actuation member toward the first position. As shown, the first
biasing member may be within the first flow path 71. In some
embodiments, the actuation member 22 can comprise a second biasing
member 33, such as a spring. The second spring can be configured to
bias the actuation member toward the first position and/or can be
used to prevent the actuation member from bottoming out on a wall
of the housing. The second biasing member can be within the second
flow path 73. In some embodiments, the actuation member can have
only a single biasing member configured to bias the actuation
member toward the first position.
[0151] In some embodiments the actuation member can have a first
end 26 that extends at least partially into the second inlet 14.
The first end can be configured such that when a connector, such as
of a source of fuel, connects to the second inlet 14, the connector
will move the first end. In some embodiments, moving the first end
can include moving the actuation member 22 into the second
position. Thus, in some embodiments and as illustrated, the
actuation member 22 can be biased into the first position in which
the second inlet 14 can be closed or substantially closed, and
connecting a source of fuel to the second inlet can open the second
inlet 14 and close or substantially close the first outlet 18. In
some embodiments, the first end 26 of the actuation member can
extend at least partially into the first inlet 12, and connecting a
source of fuel to the first inlet can move the actuation member
from the first position to the second position. In some
embodiments, a first source of fuel can be liquid propane and a
second source of fuel can be natural gas.
[0152] FIGS. 19A and 19B illustrate cross-sectional views of the
fuel selector valve 3. In FIG. 19A the actuation member 22 is in
the first position, and in FIG. 19B the actuation member is in the
second position. As described above, and as illustrated in FIG.
19A, in the first position the second sealing section 37 of the
second valve member 36 can seat against a second ledge 66,
substantially closing the second inlet 14. The first valve member
34 can be spaced from the first ledge 64, such that a gap can exist
between the first sealing section 35 and the first ledge 64,
allowing fluid to flow through an open first outlet 18.
[0153] In the second position, illustrated in FIG. 19B, the
actuation member has moved such that a gap exists between the
second sealing section 37 and the second ledge 66, allowing fluid
to flow through the open second inlet 14. Also, in the second
position, the first valve member 34 can seat against the first
ledge 64, substantially closing the first outlet 18.
[0154] In some embodiments, the fuel selector valve 3 can have two
inlets and one outlet. The actuation member 22 can be positioned as
described above, but the first outlet 18 can be an inlet and the
second outlet 19 and the first inlet 12 can be combined into a
single connected outlet. The actuation member can take other forms
as well that allows for one inlet to be closed, while the other is
opened.
[0155] Turning now to FIGS. 20-23, another embodiment of an inlet
or fuel selector valve 3 is shown. It will be understood that parts
of this valve can function in a similar manner to the heating
sources and valves shown and described above. Thus, similar
reference numbers are used. In some embodiments, the fuel selector
valve 3 can be configured such that inlets of the valve are only
open when they are connected to a source of fuel, as described in
more detail below.
[0156] FIG. 20 illustrates an external view of a fuel selector
valve 3 that can have a first inlet 12 and a second inlet 14. Both
inlets can have an actuation member with an end that can at least
partially enter the inlet and close or substantially close the
inlet. For example, as illustrated, the first inlet 12 can have a
first actuation member with an end 26 that blocks the inlet.
Similarly, the second inlet 14 can have a second actuation member
with an end 28 that blocks the inlet.
[0157] FIG. 21 illustrates a cross sectional view of the fuel
selector valve 3 that shows a first actuation member 22 with the
end 26 and the second actuation member 24 with the end 28. As
described with respect to various embodiments above, the actuation
members can have sealing sections 35, 37 that can seat against
respective ledges 64, 66 to close or substantially close their
respective inlets 12, 14. Thus, the first actuation member 22 can
have a first position in which the sealing section 35 of the first
actuation member seats against the first ledge 64. Similarly, the
second actuation member 24 can have a first position in which the
sealing section 37 of the second actuation member seats against the
second ledge 66. Each actuation member preferably has a biasing
member, such as a spring 32, 34, that biases the actuation member
toward the first position.
[0158] As described in various embodiments above, when a connector,
such as of a source of fuel, connects to one of the inlets, it can
move the actuation member into a second position that allows fluid
to flow through the inlet. FIGS. 22A and 22B illustrate a connector
of a source of fuel connected to the first inlet 12 and to the
second inlet 14, respectively.
[0159] In FIG. 22A, the connector 30 has moved the first actuation
member 22 away from the first ledge 64 into the second position,
creating a gap that allows fluid to flow along a first flow path
71. In FIG. 22B, the connector 30 has moved the second actuation
member 24 away from the second ledge 66 into the second position,
creating a gap that allows fluid to flow along a second flow path
73. In some embodiments, the first and second flow paths 71, 73 can
pass through respective pressure regulators 16', 16''.
[0160] FIG. 23 illustrates a cross sectional view of the fuel
selector valve that shows the first inlet 12 and a first pressure
regulator 16'. The first pressure regulator can function similarly
to various embodiments of pressure regulators described above.
Similarly, a second pressure regulator 16'' through which the
second flow path 73 passes can function the same as the first
pressure regulator.
[0161] As with some pressure regulators described above, the
pressure settings of each pressure regulator 16', 16'' can be
independently adjusted by tensioning of a screw or other device 41
that allows for flow control of the fuel at a predetermined
pressure or pressure range (which can correspond to a height of a
spring 40) and selectively maintains an orifice open so that the
fuel can flow through a spring-loaded valve or valve assembly of
the pressure regulator. If the pressure exceeds a threshold
pressure, a plunger seat 43 can be pushed towards a seal ring 45 to
seal off the orifice, thereby closing the pressure regulator.
[0162] Each of the fuel selector valves described herein can be
used with a pilot light or oxygen depletion sensor, a nozzle, and a
burner to form part of a heater or other gas appliance. The
different configurations of valves and controls such as by the
actuation members can allow the fuel selector valve to be used in
different types of systems. For example, the fuel selector valve
can be used in a dual fuel heater system with separate ODS and
nozzles for each fuel. The fuel selector valve can also be used
with nozzles and ODS that are pressure sensitive so that can be
only one nozzle, one ODS, or one line leading to the various
components from the fuel selector valve.
[0163] According to some embodiments, a heater assembly can be used
with one of a first fuel type or a second fuel type different than
the first. The heater assembly can include a pressure regulator
having a first position and a second position and a housing having
first and second fuel hook-ups. The first fuel hook-up can be used
for connecting the first fuel type to the heater assembly and the
second hook-up can be used for connecting the second fuel type to
the heater assembly. An actuation member can be positioned such
that one end is located within the second fuel hook-up. The
actuation member can have a first position and a second position,
such that connecting a fuel source to the heater assembly at the
second fuel hook-up moves the actuation member from the first
position to the second position. This can cause the pressure
regulator to move from its first position to its second position.
As has been discussed, the pressure regulator in the second
position can be configured to regulate a fuel flow of the second
fuel type within a predetermined range.
[0164] The heater assembly may also include one or more of a second
pressure regulator, a second actuation member, and one or more arms
extending between the respective actuation member and pressure
regulator. The one or more arms can be configured to establish a
compressible height of a pressure regulator spring within the
pressure regulator.
[0165] A heater assembly can be used with one of a first fuel type
or a second fuel type different than the first. The heater assembly
can include at least one pressure regulator and a housing. The
housing can comprise a first fuel hook-up for connecting the first
fuel type to the heater assembly, and a second fuel hook-up for
connecting the second fuel type to the heater assembly. The housing
can also include a first inlet, a first outlet, a second outlet
configured with an open position and a closed position, and a first
valve configured to open and close the second outlet. A first
actuation member having an end located within the second fuel
hook-up and having a first position and a second position can be
configured such that connecting a fuel source to the heater
assembly at the second fuel hook-up moves the actuation member from
the first position to the second position which causes the first
valve to open the second outlet, the second outlet being in fluid
communication with the second fuel hook-up.
[0166] The first actuation member can be further configured such
that connecting the fuel source to the heater assembly at the
second fuel hook-up moves the first actuation member from the first
position to the second position which causes the at least one
pressure regulator to move from a first position to a second
position, wherein the at least one pressure regulator in the second
position is configured to regulate a fuel flow of the second fuel
type within a predetermined range.
[0167] The at least one pressure regulator can comprise first and
second pressure regulators, the first pressure regulator being in
fluid communication with the first fuel hookup and the second
pressure regulator being in fluid communication with the second
fuel hook-up.
[0168] Similarly, the first valve can be configured to open and
close both the first and second outlets or there can be a second
valve configured to open and close the first outlet. The housing
may include addition, inlets, outlets and valves. Also, a second
actuation member may be used positioned within the first fuel
hook-up.
[0169] Turning now to FIGS. 24-26, another embodiment of a heating
assembly is shown that is similar to that shown in FIGS. 2C and
18A-19B. The components of the heater assembly can be the same or
substantially similar to similar components in previously described
embodiments; thus, similar reference numbers are used.
[0170] FIG. 24 illustrates a detailed view of embodiments of a fuel
selector valve 3 and burners 190', among other features. The
heating assembly of FIG. 24 can be used, for example, with the BBQ
100' of FIG. 2A.
[0171] As illustrated, in some embodiments the fuel selector valve
3 can have a first outlet 18 that is part of a first flow path 71,
and a second outlet 19 that is part of a second flow path 73. The
first and second flow paths can intersect at a common or shared
flow path 75. In some embodiments, the second flow path 73 can pass
through a pressure regulator 16 before joining with the first flow
path 71. In still other embodiments, both flow paths can pass
through a designated pressure regulator before joining
together.
[0172] The heating assembly can include a fuel selector valve 3.
Where the heater is a dual fuel heater, either a first or second
fuel can be introduced into the heater through the fuel selector
valve. The fuel can flow to one or more burners 190'. In some
embodiments, the heater can have one or more different types and/or
sizes of burners 190'. As shown, the heating assembly has a number
of burners 190' to be positioned within a BBQ grill, as well as a
side burner. In some embodiments, one or more of the burners 190'
can have a control valve 130' associated with it, and/or have a
burner cover. In some embodiments a control valve 130' can include
a knob.
[0173] The control valves 130' can be any number of different
designs, including those disclosed in U.S. application Ser. No.
13/791,652 filed Mar. 8, 2013, published as US 2013/0186492, for
example, those shown in FIGS. 25A-27B and 45-50B, the entire
application of which is incorporated herein and made a part of this
specification.
[0174] Looking now to FIGS. 25-26, the embodiment of an inlet or
fuel selector valve 3 of FIG. 24 is shown in more detail. It will
be understood that the fuel selector valve 3 is very similar to
that shown and described with reference to FIGS. 18A-19B. One
difference between the two valves is the addition of a low pressure
cut-off switch 88. Adding a low pressure cut-off switch 88 to the
high pressure inlet 12 of the fuel selector valve can improve the
overall utility of the pressure selector valve by avoiding
erroneous operation under a low inlet pressure condition. Such a
condition may be present for example, when the gas is supplied from
a propane tank 90 that is reaching depletion. Even if the tank 90
has a separate pressure regulator 16 (see FIG. 24) the fuel may
still be supplied at a pressure that is lower than required or
desired for operation of the heater, such as a barbeque.
[0175] The low pressure cut-off switch 88 as shown in FIG. 25, can
include a valve member 92 biased to a closed position and engaged
with a valve seat 94. As shown, it can also include a diaphragm 96
and a spring 98. The fuel can act on the diaphragm 96 to open the
valve 92 at a pre-set pressure. The low pressure cut-off switch 88
can also include a vent 102 to help ensure proper movement of the
diaphragm and a screw 104 to calibrate the tension on the spring.
The valve member 92 can be made of a flexible rubber like material
to help ensure a proper seat is maintained with the valve seat 94.
In some embodiments, the valve member 92 and diaphragm 96 are
combined in a single part.
[0176] FIG. 25A shows the fuel selector valve 3 under a low
pressure condition. The low pressure cut-off switch 88 remains
closed so that fuel from the first inlet 12 is prevented from
exiting the selector valve. FIG. 25B shows a higher pressure
condition. As shown, the higher pressure fuel opens the low
pressure cut-off switch 88 to allow fuel to flow from the first
inlet 12 to the first outlet 18 along flow path 71.
[0177] In FIG. 26, a different fuel source is connected to the
second inlet 14. This moves the internal valve allowing fuel flow
between the second inlet 14 and the second outlet 19 along flow
path 73 while closing the path between the first inlet 12 and
outlet 18.
[0178] As shown, the fuel selector valve 3 can include a first
inlet 12, a second inlet 14, a first outlet 18, and a second outlet
19. The first inlet can correspond with the first outlet and the
second inlet can correspond with the second outlet. The first inlet
can connect to the first outlet via a first flow path 71, and the
second inlet can connect to the second outlet via a second flow
path 73. In some embodiments, the first and second flow paths can
be distinct within the valve, such that there is no fluid
communication between the first and second flow paths within the
valve.
[0179] The fuel selector valve can include an actuation member 22.
The actuation member preferably extends from the first flow path to
the second flow path. In some embodiments, as illustrated, the
actuation member can comprise a rod. In some embodiments, the
actuation member can comprise a first valve member 34 and a second
valve member 36. With two valve members, the actuation member can
allow for one flow path to be open while the other is closed. The
actuation member can be biased to a first position where at least
one of the valve members is seated to close the flow path.
Advancing the actuation member can open a seated valve member and
ensure that the other valve member is closed.
[0180] In some embodiments, the first valve member can include a
sealing section 35 that can be configured to seat against a first
ledge 64, closing the first outlet 18 and blocking or substantially
blocking fluid communication along the first flow path 71 between
the first inlet 12 and the first outlet 18. Similarly, the second
valve member can include a sealing section 37 that can be
configured to seat against a second ledge 66, closing the second
outlet 9 and blocking or substantially blocking fluid communication
along the second flow path 73 between the second inlet 14 and the
second outlet 19.
[0181] In some embodiments, the actuation member can have a first
position in which the second valve member 36 closes the second flow
path 73 (i.e., by closing or substantially closing the second inlet
14 and/or the second outlet 19). The first flow path 71 can be open
with the actuation member in the first position. The actuation
member can also have a second position in which the first valve
member 34 closes the first flow path 71 (i.e., by closing or
substantially closing the first inlet and/or the first outlet). The
second flow path 73 can be open with the actuation member in the
first position.
[0182] In some embodiments, the actuation member 22 can comprise a
first biasing member 32, such as a spring, configured to bias the
actuation member toward the first position. As shown, the first
biasing member may be within the first flow path. In some
embodiments, the actuation member 22 can comprise a second biasing
member 33, such as a spring. The second spring can be configured to
bias the actuation member toward the first position and/or can be
used to prevent the actuation member from bottoming out on a wall
of the housing. The second biasing member can be within the second
flow path. In some embodiments, the actuation member can have only
a single biasing member configured to bias the actuation member
toward the first position.
[0183] In some embodiments the actuation member can have a first
end 26 that extends at least partially into the second inlet 14.
The first end can be configured such that when a connector, such as
of a source of fuel, connects to the second inlet, the connector
will move the first end. In some embodiments, moving the first end
can include moving the actuation member into the second position.
Thus, in some embodiments and as illustrated, the actuation member
can be biased into the first position in which the second inlet can
be closed or substantially closed, and connecting a source of fuel
to the second inlet can open the second inlet and close or
substantially close the first outlet. In some embodiments, the
first end of the actuation member can extend at least partially
into the first inlet, and connecting a source of fuel to the first
inlet can move the actuation member from the first position to the
second position. In some embodiments, a first source of fuel can be
liquid propane and a second source of fuel can be natural gas.
[0184] In FIGS. 25A and 25B the actuation member 22 is in the first
position and in FIG. 26 the actuation member 22 is in the second
position. As described above, and as illustrated, in the first
position the second sealing section of the second valve member can
seat against a second ledge, substantially closing the second
inlet. The first valve member can be spaced from the first ledge,
such that a gap can exist between the first sealing section and the
first ledge, allowing fluid to flow through an open first
outlet.
[0185] In the second position, illustrated in FIG. 26, the
actuation member has moved such that a gap exists between the
second sealing section and the second ledge, allowing fluid to flow
through the open second inlet. Also, in the second position, the
first valve member can seat against the first ledge, substantially
closing the first outlet.
[0186] In some embodiments, the fuel selector valve can have two
inlets and one outlet. The actuation member can be positioned as
described above, but the first outlet can be an inlet and the
second outlet and the first inlet can be combined into a single
connected outlet. The actuation member can take other forms as well
that allows for one inlet to be closed, while the other is
opened.
[0187] Turning now to FIGS. 27-30, another embodiment of a heating
assembly is shown that is most similar to that shown in FIGS.
24-26. The components of the heater assembly can be the same or
substantially similar to similar components in previously described
embodiments; thus, similar reference numbers are used.
[0188] One difference between the two heating assemblies is the
combination of a pressure regulator 16 and some of the flow paths
into the fuel selector valve 3, such that the fuel selector valve 3
has a single outlet 106. Thus, as can be seen with reference to
FIG. 28, the first and second flow paths 71, 73 are internal to the
fuel selector valve 3 and the flow path 75 starts within the fuel
selector valve 3.
[0189] FIG. 27 illustrates a detailed view of embodiments of a fuel
selector valve 3 and burners 190', among other features. The
heating assembly of FIG. 27 can be used, for example, with the BBQ
100' of FIG. 2A.
[0190] Looking now to FIG. 28, the embodiment of an inlet or fuel
selector valve 3 of FIG. 27 is shown in more detail. It can be seen
that the illustrated fuel selector valve 3 includes two inlets 12,
14, a low pressure cut-off switch 88, actuation member 22, a
pressure regulator 16 and an outlet 106.
[0191] It will be understood that the pressure regulator 16 can
include components similar to the low pressure cut-off switch 88 as
shown in FIG. 28. Thus, the pressure regulator can include a valve
member 92, a valve seat 94, a diaphragm 96 and a spring 98. It can
also include a vent 102 to help ensure proper movement of the
diaphragm and a screw 104 to calibrate the tension on the
spring.
[0192] FIGS. 29A-30, similar to FIGS. 25A-26 show the fuel selector
valve 3 1) under a low pressure condition with fuel coming from the
first inlet 12, 2) under a higher pressure condition with fuel
coming from the first inlet 12, and 3) with fuel coming from the
second inlet 14. In FIG. 29A under the low pressure condition, the
low pressure cut-off switch 88 remains closed so that fuel from the
first inlet 12 is prevented from exiting the selector valve. In
FIG. 29B, the higher pressure fuel opens the low pressure cut-off
switch 88 to allow fuel to flow from the first inlet 12 to the
first outlet 18 along flow path 71.
[0193] In FIG. 30, a different fuel source is connected to the
second inlet 14. This moves the internal valve allowing fuel flow
between the second inlet 14 and the second outlet 19 along flow
path 73 while closing the path between the first inlet 12 and
outlet 18.
[0194] Referring now to FIGS. 31 through 33B, a dual fuel
selectable BBQ 300 is shown. While the below discussion refers to
the control of fuel delivery to burners of a BBQ, other apparatus
that use multiple fuel sources (LP gas and natural gas) may benefit
from the fuel selector design as herein described.
[0195] FIG. 31 illustrates a control default condition, where
natural gas is delivered to one or more burners 302. The natural
gas passes into a regulator 304 that includes a first flow path
indicated by arrow 306A where the pressure of the gas is detected
by a pressure sensor 308. The pressure sensor 308 may be a normally
open switch that, upon sensing a pressure beyond a predetermined
threshold, can close. Of course, other switch designs are
contemplated within the scope of the present invention. The
regulator 304 can include a pressure regulated valve 310 that may
close when the pressure of the gas entering the regulator 304 is
beyond a pre-set limit. Such a limit may be set so that the valve
310 closes when the pressure of LP gas is introduced into the
regulator 304, as discussed below.
[0196] In the control default mode, as shown in FIG. 31, the
natural gas can pass through the regulator 304, as shown by arrow
306 and be delivered to one or more gas valves 312, three of which
are shown in the exemplary embodiment of FIG. 31. Of course, any
number of gas valves 312 may be used, dependent upon the number of
burners 302. In some embodiments, the gas valves 312 can include a
first flow path 314 and a second flow path 316. Delivery of fuel to
the first and second flow paths 314, 316 may be regulated with one
or more flow control knobs 318, as may be known in the art. When
the flow control knobs 318 are open, the first flow path 314 may
deliver fuel to the burner 302 via gas injectors 322. Further, in
the control default condition, as shown in FIG. 31, the second flow
path 316 also may deliver fuel to burner 302.
[0197] A valve, such as a solenoid valve 320 may be used to open or
close flow of fuel through the second flow path 316. The solenoid
valve 320 may be a pick and hold type of valve, wherein a voltage
pulse delivered to the solenoid valve 320 may be used to move the
valve in one direction or the other and maintain that position
until activated by an opposite voltage pulse, as discussed in
greater detail below.
[0198] Looking now at FIG. 32A, when the pressure sensor 308
detects a greater pressure, such as that of LP gas, a signal may be
sent to a control module 324. The control module 324, which may be
powered by a battery 326, for example, can deliver a positive
output voltage pulse, as shown in FIG. 32B to a regulator solenoid
valve 328, permitting the LP gas to flow through a second flow path
306B through the regulator 304. In some embodiments, the valve 310
may close to restrict flow of the higher pressure LP gas through
the first flow path 306A (see FIG. 31).
[0199] The control module 324 can send the positive output voltage
pulse to solenoid valves 320, blocking the flow of LP gas through
the second flow path 316. Thus, the dual fuel gas valve 312 can
provide a restricted flow of the LP gas, being at a greater
pressure than natural gas, to the burners 302. Moreover, should the
pressure sensor 308 detect a natural gas pressure that exceeds a
predetermined maximum, the system may react similar to LP gas
detection, moving the solenoid valves 320 to block flow through the
second flow path 316 and restrict flow of fuel to the burners 302,
resulting in a safe system that may react not only to change of
fuels, but to a pressure spike when natural gas is being used as a
sole fuel.
[0200] Referring now to FIGS. 33A and 33B, after the system is
placed into the control activated mode, as shown in FIG. 32A (due
to, for example, a pressure spike in natural gas delivery or a
change-over to LP gas), and the user changes back over to natural
gas (or the pressure spike has subsided), the user may desire that
the system revert back to the control default (FIG. 31)
configuration. In some embodiments, a natural gas reset button 330
can be provided where, upon depressing the button 330, a negative
output voltage pulse, as shown in FIG. 33B, may be output by the
control module 324, thereby closing the first flow path 306A in the
regulator 304 and opening the second flow path 316 through the dual
fuel gas valve 312, as shown in FIG. 33A. Thus, depression of the
natural gas reset button 330 may convert the system from the
control activated mode (FIG. 32A) to the control default mode (FIG.
31).
[0201] In some embodiments, an indicator (not shown) may be
provided to signal a user as to whether the apparatus is in the
control default mode or in the control activated mode. The
indicator may be any indicator as may be known in the art, such as
an illuminated indicator, a mechanical indicator, or the like.
[0202] In some embodiments, the control module 324 may include a
means to override an output therefrom. For example, a user (or
service technician) may have the ability to force the control
module 324 to output one or a positive or negative output voltage
pulse. Such an override may help in troubleshooting issues in the
system, for example. Although this invention has been disclosed in
the context of certain preferred embodiments and examples, it will
be understood by those skilled in the art that the present
invention extends beyond the specifically disclosed embodiments to
other alternative embodiments and/or uses of the invention and
obvious modifications and equivalents thereof. In addition, while a
number of variations of the invention have been shown and described
in detail, other modifications, which are within the scope of this
invention, will be readily apparent to those of skill in the art
based upon this disclosure. It is also contemplated that various
combinations or sub-combinations of the specific features and
aspects of the embodiments may be made and still fall within the
scope of the invention. Accordingly, it should be understood that
various features and aspects of the disclosed embodiments can be
combined with or substituted for one another in order to form
varying modes of the disclosed invention. Thus, it is intended that
the scope of the present invention herein disclosed should not be
limited by the particular disclosed embodiments described above,
but should be determined only by a fair reading of the claims that
follow.
[0203] Similarly, this method of disclosure, is not to be
interpreted as reflecting an intention that any claim require more
features than are expressly recited in that claim. Rather, as the
following claims reflect, inventive aspects lie in a combination of
fewer than all features of any single foregoing disclosed
embodiment. Thus, the claims following the Detailed Description are
hereby expressly incorporated into this Detailed Description, with
each claim standing on its own as a separate embodiment.
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