U.S. patent application number 09/938015 was filed with the patent office on 2002-07-04 for gas burner control system.
Invention is credited to Chen, Wen Chou.
Application Number | 20020086255 09/938015 |
Document ID | / |
Family ID | 46278058 |
Filed Date | 2002-07-04 |
United States Patent
Application |
20020086255 |
Kind Code |
A1 |
Chen, Wen Chou |
July 4, 2002 |
Gas burner control system
Abstract
A gas burner control system includes a control unit formed of a
valve seat and main valve assembly and at least one solenoid valve
and installed in the burner body and connected to the electronic
igniter, and an operation unit formed of a power switch and at
least one flame intensity control switch and provided outside the
burner body and connected to the control unit and the electronic
igniter. Switching on the power switch opens the main valve
assembly and drives the electronic igniter to ignite ignition
flame. Switching on one flame intensity control valve opens the
corresponding solenoid valve for producing the desired intensity of
burner flame.
Inventors: |
Chen, Wen Chou; (Taipei,
TW) |
Correspondence
Address: |
Wen Chou Chen
No. 34, Lane 87
Fu I Street
Chi Tu
KEELUNG 206
TW
|
Family ID: |
46278058 |
Appl. No.: |
09/938015 |
Filed: |
August 24, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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09938015 |
Aug 24, 2001 |
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09753730 |
Jan 3, 2001 |
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Current U.S.
Class: |
431/51 |
Current CPC
Class: |
F23N 1/005 20130101;
F23N 2227/22 20200101; F23N 2235/18 20200101; F23N 2227/36
20200101; F23N 2235/14 20200101; F24C 3/128 20130101; F23N 2241/08
20200101; F23N 2237/20 20200101 |
Class at
Publication: |
431/51 |
International
Class: |
F23Q 009/08 |
Claims
What the invention claimed is:
1. A gas burner control system installed in a gas burner and
adapted to control the operation of the gas burner, comprising: a
control unit, said control unit comprising: a valve seat, said
valve seat comprising a fuel gas path, a gas inlet adapted to fuel
gas from an external fuel gas source to said fuel gas path, a first
gas outlet adapted to guide fuel gas from said fuel gas path to the
ignition flame nozzle of the gas burner, and a second gas outlet
adapted to guide fuel gas from said fuel gas path to the burner
flame nozzle tube of the gas burner; a normal-close main valve
assembly supported in said valve seat and electrically connected to
the electronic igniter of the gas burner and adapted to close/open
the fuel gas passage from the gas inlet of said valve seat to said
fuel gas path of said valve seat; and at least one normal-close
solenoid valve (hereinafter called as solenoid valve) supported in
said valve seat and adapted to close/open the fuel gas passage from
the fuel gas path of said valve seat to the second gas outlet of
said valve seat; and an operation unit, said operation unit
comprising: a power switch electrically connected to said
electronic igniter; and at least one flame intensity control switch
electrically connected to said at least one solenoid valve and the
electronic igniter of the gas burner and adapted to close/open said
at least one solenoid valve.
2. The gas burner control system as claimed in claim 1 wherein said
normal-close main valve assembly is comprised of a plurality of
normal-close solenoid valves (hereinafter called as normal-close
valves) connected in parallel to the electronic igniter of the gas
burner and adapted to synchronously close/open the fuel gas passage
from the gas inlet of said valve seat to the fuel gas path of said
valve seat.
3. The gas burner control system as claimed in claim 1 wherein said
control unit further comprises a normal-close ignition flame
control valve electrically connected to the electronic igniter of
the gas burner and adapted to close/open the fuel gas passage from
the fuel gas path of said valve seat to the first gas outlet of
said valve seat.
4. The gas burner control system as claimed in claim 1 wherein the
gas inlet of said valve seat further comprises a wire gauze
filter.
5. The gas burner control system as claimed in claim 1 wherein said
operation unit further comprises a receiver electrically connected
to the electronic igniter and said control unit, and a remote
controller adapted to transmit a control signal to said receiver by
radio to turn on/off the electronic igniter of the gas burner and
to close/open said solenoid valves.
6. The gas burner control system as claimed in claim 1 further
comprising a temperature sensor adapted to detect the temperature
of a predetermined area and to turn on/off the electronic igniter
of the gas burner and the at least one flame intensity control
switch subject to the temperature level of the predetermined
area.
7. The gas burner control system as claimed in claim 1 further
comprising a temperature sensor adapted to detect the temperature
of a predetermined area and to turn on/off the electronic igniter
of the gas burner and said power switch subject to the temperature
level of the predetermined area.
8. The gas burner control system as claimed in claim 3 wherein said
main valve assembly and said ignition flame control valve are
respectively connected to a respective terminal of the electronic
igniter of the gas burner for enabling the electronic igniter of
the gas burner to close/open said main valve assembly and said
ignition flame control valve separately.
9. The gas burner control system as claimed in claim 8 further
comprising a control circuit installed in the electronic igniter of
the gas burner and adapted to cut off power supply from said
ignition flame control valve a predetermined length of time after
the presence of burner flame at the burner flame nozzle tube of the
gas burner.
10. A gas burner control system installed in a gas burner and
adapted to control the operation of the gas burner, comprising: a
control unit, said control unit comprising: a valve seat, said
valve seat comprising a fuel gas path, a gas inlet adapted to fuel
gas from an external fuel gas source to said fuel gas path, a first
gas outlet adapted to guide fuel gas from said fuel gas path to the
ignition flame nozzle of the gas burner, and a second gas outlet
adapted to guide fuel gas from said fuel gas path to the burner
flame nozzle tube of the gas burner; a micro switch, said micro
switch having a common contact and a normal-open contact
electrically connected to the electronic igniter of the gas burner;
a cock adapted to switch on/off said micro switch, said cock
comprising a gas inlet and a gas outlet connected to the gas inlet
of said valve seat; a normal-close main valve assembly supported in
said valve seat and electrically connected to the electronic
igniter of the gas burner and adapted to close/open the fuel gas
passage from the gas inlet of said valve seat to said fuel gas path
of said valve seat; and at least one normal-close solenoid valve
(hereinafter called as solenoid valve) supported in said valve seat
and adapted to close/open the fuel gas passage from the fuel gas
path of said valve seat to the second gas outlet of said valve
seat.
11. The gas burner control system as claimed in claim 10 wherein
said normal-close main valve assembly is comprised of a plurality
of normal-close solenoid valves (hereinafter called as normal-close
valves) connected in parallel to the electronic igniter of the gas
burner and adapted to synchronously close/open the fuel gas passage
from the gas inlet of said valve seat to the fuel gas path of said
valve seat.
12. The gas burner control system as claimed in claim 10 wherein
said control unit further comprises a normal-close ignition flame
control valve electrically connected to the electronic igniter of
the gas burner and adapted to close/open the fuel gas passage from
the fuel gas path of said valve seat to the first gas outlet of
said valve seat.
13. The gas burner control system as claimed in claim 10 wherein
said cock is connected between said main valve assembly and said at
least one solenoid valve and adapted to regulate the flow rate of
fuel gas passing through the fuel gas path of said valve seat.
14. The gas burner control system as claimed in claim 10 wherein
said cock is connected between said at least one solenoid valve and
the second gas outlet of said valve seat and adapted to regulate
the flow rate of fuel gas passing through the fuel gas path of said
valve seat.
15. The gas burner control system as claimed in claim 10 wherein
the gas inlet of said cock comprises a wire gauze filter.
16. The gas burner control system as claimed in claim 12 wherein
said main valve assembly and said ignition flame control valve are
respectively connected to a respective terminal of the electronic
igniter of the gas burner for enabling the electronic igniter of
the gas burner to close/open said main valve assembly and said
ignition flame control valve separately.
17. The gas burner control system as claimed in claim 16 further
comprising a control circuit installed in the electronic igniter of
the gas burner and adapted to cut off power supply from said
ignition flame control valve a predetermined length of time after
the presence of burner flame at the burner flame nozzle tube of the
gas burner.
Description
RELATED PATENT APPLICATION
[0001] This application is a continuation-in-part of application
Ser. No. 09/753,730 filed Jan. 3, 2001.
BACKGROUND OF THE INVENTION
[0002] The present invention relates to gas burners, and more
particularly to a gas burner control system, which enables the user
to control the operation of the gas burner and regulate the
intensity of flame at a far place away from the burner body of the
gas burner.
[0003] Regular gas burners for use to keep rooms warm commonly use
a piezoelectric ignition switch (cock) to control the ignition of
fuel gas and the intensity of the flame. Because the ignition
switch is installed in the body of the burner, the user must
approach the burner when operating the ignition switch. When
operating the ignition switch, the user may have to bend the body
or draw up the legs closely beneath the body. This design is
inconvenient to a disable or aged person. When in use, the user
must hold the piezoelectric ignition switch in the depressed
position after the presence of the ignition flame, and then release
the piezoelectric ignition switch after the presence of the desired
burner flame. In case the burner flame and/or the igniting flame is
extinguished by wind or an accident, the user must depress the
piezoelectric ignition switch and then rotate it from the
off-position to the on-position again to ignite the ignition flame
so as to further ignite the burner flame. When regulating the
intensity of the burner flame, the user must approach the burner
and then rotate the cock.
SUMMARY OF THE INVENTION
[0004] The invention has been accomplished to provide a gas burner
control system, which eliminates the aforesaid drawbacks.
[0005] It is one object of the present invention to provide a gas
burner control system, which enables the user to control the
operation of the gas burner and regulates the intensity of flame
without approaching the burner body of the gas burner.
[0006] It is another object of the present invention to provide a
gas burner control system, which enables the user to ignite flame
and to regulate the flame intensity as simple as operating an
indoor lamp switch or a remote controller.
[0007] According to one embodiment of the present invention, the
gas burner control system comprises a control unit and an operation
unit. The control unit comprises a valve seat, the valve seat
comprising a fuel gas path, a gas inlet adapted to fuel gas from an
external fuel gas source to the fuel gas path, a first gas outlet
adapted to guide fuel gas from the fuel gas path to the ignition
flame nozzle of the gas burner, and a second gas outlet adapted to
guide fuel gas from the fuel gas path to the burner flame nozzle
tube of the gas burner; a normal-close main valve assembly
supported in the valve seat and electrically connected to the
electronic igniter of the gas burner and adapted to close/open the
fuel gas passage from the gas inlet of the valve seat to the fuel
gas path of the valve seat; and at least one normal-close solenoid
valve (hereinafter called as solenoid valve) supported in the valve
seat and adapted to close/open the fuel gas passage from the fuel
gas path of the valve seat to the second gas outlet of the valve
seat. The operation unit comprises a power switch electrically
connected to the electronic igniter, and at least one flame
intensity control switch electrically connected to the at least one
solenoid valve and the electronic igniter of the gas burner and
adapted to close/open the at least one solenoid valve.
[0008] As an alternate form of the present invention, a cock is
used to substitute for the operation unit to control on/off of the
electronic igniter, to close/open the fuel gas passage, and to
regulate the flow rate of fuel gas.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIG. 1 is a system block diagram of a wire-controlled type
gas burner control system according to the present invention.
[0010] FIG. 2 is a system block diagram of a remote-control type
gas burner control system according to the present invention.
[0011] FIG. 3 is a sectional view of a gas burner control system
according to a first embodiment of the present invention.
[0012] FIG. 4 is similar to FIG. 3 but showing the power switch and
the high flame control switch switched on, the main valve assembly,
the ignition flame control valve and the high flow rate control
valve opened.
[0013] FIG. 5 is similar to FIG. 4 but showing the power switch and
the medium flame control switch switched on, the main valve
assembly, the ignition flame control valve and the medium flow rate
control valve opened.
[0014] FIG. 6 is similar to FIG. 4 but showing the power switch and
the low flame control switch switched on, the main valve assembly,
the ignition flame control valve and the low flow rate control
valve opened.
[0015] FIG. 7 is a sectional view of a gas burner control system
according to a second embodiment of the present invention.
[0016] FIG. 8 is a sectional view of a gas burner control system
according to a third embodiment of the present invention.
[0017] FIG. 9 is a sectional view of a gas burner control system
according to a fourth embodiment of the present invention.
[0018] FIG. 10 is a sectional view of a gas burner control system
according to a fifth embodiment of the present invention.
[0019] FIG. 11 is a sectional view of a gas burner control system
according to a sixth embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0020] Referring to FIG. 1, a gas burner control system 10 in
accordance with the present invention is shown comprising a control
unit 1 and an operation unit 5. The control unit 1 is installed in
the burner body 7 and connected to the electronic igniter 8 in the
burner body 7. The operation unit 5 is provided outside the burner
body 7, for example, on the wall, and electrically connected to the
control unit 1 and the electronic igniter 8 for enabling the user
to ignite the electronic igniter 8 and regulate the burner flame by
means of operating the switches 51.about.54 of the operation unit 5
without approaching the burner.
[0021] Referring to FIG. 3, the control unit 1 comprises a valve
seat 1 supporting a main valve assembly 12, an ignition flame
control valve 15, a high flow rate control valve 16, a medium flow
rate control valve 17 and a low flow rate control valve 18. The
valve seat 1 has a gas path 19, a gas inlet 20, a first gas outlet
21, and a second gas outlet 22. The gas inlet 20 is connected to
gas source, and mounted with a wire gauze filter 47 adapted to
remove solid matter from fuel gas passing through the gas inlet 20.
The first gas outlet 21 is connected through a subsidiary gas pipe
71 to the ignition flame nozzle 72 of the gas burner. The second
gas outlet 22 is connected through a main gas pipe 73 to the burner
flame nozzle tube 74. The main valve assembly 12 is comprised of a
plurality of solenoid valves 13 and 14 that are normally closed
(hereinafter called as normal-close valves). The normal-close
valves 13 and 14 are connected in parallel to the electronic
igniter 8, and synchronously switched to open the gas passage from
the gas inlet 20 to the gas path 19. The ignition flame control
valve 15 is electrically connected to the electronic igniter 8, and
adapted to control the gas passage from the gas path 19 to the
first gas outlet 21. The operation unit 5 comprises a high flame
control switch 52, a medium flame control switch 53, and a low
flame control switch 54. The high flame control switch 52 of the
operation unit 5 controls the high flow rate control valve 16 to
close/open the gas passage from the gas path 19 to the second gas
outlet 22, for enabling a high flow rate of fuel gas to pass from
the gas path 19 to the second gas outlet 22 and then from the
second gas outlet 22 through the main gas pipe 73 to the burner
flame nozzle tube 74 for burning and for producing a high intensity
of burner flame. The medium flame control switch 53 of the
operation unit 5 controls the medium flow rate control valve 17 to
close/open the gas passage from the gas path 19 to the second gas
outlet 22, for enabling a medium flow rate of fuel gas to pass from
the gas path 19 to the second gas outlet 22 and then from the
second gas outlet 22 through the main gas pipe 73 to the burner
flame nozzle tube 74 for burning and for producing a medium
intensity of burner flame. The low flame control switch 54 controls
the low flow rate control valve 18 to close/open the gas passage
from the gas path 19 to the second gas outlet 22, for enabling a
low flow rate of fuel gas to pass from the gas path 19 to the
second gas outlet 22 and then from the second gas outlet 22 through
the main gas pipe 73 to the burner flame nozzle tube 74 for burning
and for producing a low intensity of burner flame. The aforesaid 6
valves 13.about.18 are electrically controlled solenoid valves of
normally closed type, i.e., the contacts of the valves 13.about.18
are opened when electrically disconnected, and the corresponding
valve plugs 23.about.28 are closed to stop fuel gas from passing;
the contacts of the valves 13.about.18 are closed when electrically
connected, and the corresponding valve plugs 23.about.28 are opened
for letting fuel gas pass. Because the solenoid valves 13.about.18
are of the known art, no further detailed description is
necessary.
[0022] In order to facilitate fabrication, the solenoid valves
13.about.18 have same structure with the exception of the
installation of different inner diameters of gas outlet tubes
29.about.34 in the respective solenoid valves 13.about.18. By means
of the control of different inner diameters of gas outlet tubes
29.about.34, the solenoid valves 13.about.18 provide different fuel
gas outputs. Therefore, the solenoid valves 13.about.18 are
inter-exchangeable, i.e., only one particular specification of
solenoid valve is sufficient to satisfy the demand. Further,
O-rings 35.about.40 are respectively peripherally mounted on the
gas outlet tubes 29.about.34 and fitted with the respective gas
outlet tubes 29.about.34 into the respective gas outlet of each of
the solenoid valves 13.about.18 to prevent fuel gas leakage. Of
course, changing the inner diameters of the gas inlet tubes
41.about.46 of the solenoid valves 13.about.18 can achieve the same
gas flow rate control effect.
[0023] Referring to FIG. 3 again, in addition to the aforesaid high
flame control switch 52, medium flame control switch 53, and low
flame control switch 54, the operation unit 5 further comprises a
battery low indicator light 50 and a power switch 51. A control
circuit (not shown) in the operation unit 5 controls on/off status
of the indicator light 50, and is connected to a battery 81. When
battery power low, the control circuit turns on the battery low
indicator light 50, informing the user to replace the battery 81.
The power switch 51 controls the supply of electricity to the
electronic igniter 8. The high flame control switch 52 is
electrically connected to the high flow rate control valve 16, and
adapted to close/open the high flow rate control valve 16. The
medium flame control switch 53 is electrically connected to the
medium flow rate control valve 17, and adapted to close/open the
medium flow rate control valve 17. The low flame control switch 54
is electrically connected to the low flow rate control valve 18,
and adapted to close/open the low flow rate control valve 18.
Further, the flame control switches 52.about.54 form a linkage
switch 55, i.e. when switched on the high flame control switch 52,
the medium flame control switch 53 and the low flame control switch
54 are automatically switched off; when switched on the medium
flame control switch 53, the high flame control switch 52 and the
low flame control switch 54 are automatically switched off; when
switched on the low flame control switch 54, the high flame control
switch 52 and the medium flame control switch 53 are automatically
switched off. Because the linkage switch 55 is of the known art, no
further detailed description is necessary.
[0024] The operation control of the gas burner is outlined
hereinafter with reference to FIG. 4. When switched on the power
switch 51 to electrically connect the electronic igniter 8, the
main valve assembly 12 (i.e., the normal-close valves 13 and 14)
and the ignition flame control valve 15 are opened (The respective
valve plugs 23.about.25 are opened), enabling fuel gas to pass in
proper order through the fuel gas path 19, the ignition flame
control valve 15, the first gas outlet 21 and the subsidiary gas
pipe 71 to the ignition flame nozzle 72, and at the same time
sparks are discharged through the discharging electrode 82 to
ignite the desired ignition flame. After the presence of the
desired ignition flame, the sensor, referenced by 83, gives a
signal to the electronic igniter 8, causing it to stop discharging
high voltage through the discharging electrode 82. At the same
time, the sensor 83 connects power supply to the linkage switch 55.
When the user switches on one of the flame control switches, for
example, the high flame control switch 52, the high flow rate
control valve 16 is energized to open the valve plug 26, enabling a
high flow rate of fuel gas to pass through the high flow rate
control valve 16 to the second gas outlet 22 and then the burner
flame nozzle tube 74 for burning and for producing a high intensity
of burner flame.
[0025] When the temperature of the room surpassed a predetermined
level, as shown in FIG. 5, switch on the medium flame control
switch 53 to open the valve plug 27 of the medium flow rate control
valve 17 and to simultaneously switch off the high flame control
switch 52 and the low flame control switch 54, causing the high
flame control switch 52 and the low flame control switch 54 to
close the high flow rate control valve 17 and the low flow rate
control valve 18. At this time, fuel gas passes through the medium
flow rate control valve 17 to the burner flame nozzle tube 74 for
producing a medium intensity of burner flame while the ignition
flame is maintained available.
[0026] When changing the burner flame to the low intensity, as
shown in FIG. 6, switch on the low flame control switch 54 to open
the valve plug 28 of the low flow rate control valve 18 and to
simultaneously switch off the high flame control switch 52 and the
medium flame control switch 53. At this time, the high flow rate
control valve 16 and the medium flow rate control valve 17 are
closed, and fuel gas passes through the low flow rate control valve
18 to the burner flame nozzle tube 74 for producing a low intensity
of burner flame while the ignition flame is maintained
available.
[0027] As indicated above, the operation of the present invention
is to switch on the power switch 51 to produce the desired ignition
flame, and then to switch on the high flame control switch 52,
medium flame control switch 53 or low flame control switch 54 for
letting fuel gas pass through the high flow rate control valve 16,
medium flow rate control valve 17, or low flow rate control valve
18 to the burner flame nozzle tube 74 for producing the desired
high intensity of burner flame, medium intensity of burner flame,
or low intensity of burner flame. This operation is as easy as
switching on/off an indoor lamp switch.
[0028] Referring to FIG. 2, a receiver 57 and a remote controller
58 may be used instead of the switches 51.about.54 of the operation
unit 5. The receiver 57 is installed in the burner body 7 and
electrically connected to the electronic igniter 8 and the control
unit 1. The remote controller 58 is controlled to output control
signal by radio to the receiver 57, causing the receiver to turn
on/off the electronic igniter 8 and close/open the solenoid valves
13.about.18.
[0029] In the embodiment shown in FIG. 3, the gas burner control
system 10 further comprises a temperature sensor. The probe of the
temperature sensor is set in the desired detecting area (either
inside or outside the burner body 7). The contacts 56 of the sensor
are respectively connected to the electronic igniter 8 and the
linkage switch 55. When the temperature of the room surpassed the
set temperature level, the contacts 56 are disconnected to cut off
power supply from the high flame control switch 52, the medium
flame control switch 53, or the low flame control switch 54, to
further close the high flow rate control valve 16, the medium flow
rate control valve 17, or the low flow rate control valve 18,
preventing fuel gas from passing to the burner flame nozzle tube 74
(the ignition flame is maintained available). If the burner flame
extinguished accidentally and the temperature of the room dropped
below the set level, the contacts 56 are connected to turn on the
high flame control switch 52, the medium flame control switch 53,
or the low flame control switch 54, to further open the high flow
rate control valve 16, the medium flow rate control valve 17, or
the low flow rate control valve 18, for producing the desired high
intensity, medium intensity, or low intensity of burner flame.
[0030] Alternatively, the contacts 56 can be respectively connected
to the electronic igniter 8 and the power switch 51 (see FIG. 7).
In this case, the contacts 56 are disconnected to cut off power
supply from the electronic igniter 8 and to extinguish the burner
flame and the ignition flame when the temperature of the room
surpassed the set level. On the contrary, when the temperature of
the room dropped below the set value, the contacts 56 are connected
to turn on the electronic igniter 8, resuming the original
operation status before power off.
[0031] In the embodiment shown in FIG. 7, the high flow rate
control valve 16 of the aforesaid first embodiment (FIG. 3) is
eliminated, and the medium flow rate control valve 17 and the low
flow rate control valve 18 are incorporated to substitute for the
function of the high flow rate control valve 16. To fit this
change, the high flame control switch 52 is electrically connected
to the medium flow rate control valve 17 and the low flow rate
control valve 18. When switched on the high flame control switch
52, the medium flame control switch 53 and the low flame control
switch 54 are simultaneously switched on to open the medium flow
rate control valve 17 and the low flow rate control valve 18 for
enabling a high flow rate of fuel gas to pass to the burner flame
nozzle tube 74 for burning.
[0032] As shown in FIG. 7, the main valve assembly 12 and the
ignition flame control valve 15 are respectively connected to two
terminals of the electronic igniter 8, enabling the electronic
igniter 8 to control the main valve assembly 12 and the ignition
flame control valve 15 separately. The advantage of this design
enables an additional control circuit to be added to the electronic
igniter 8 to automatically disconnect the circuit to the ignition
flame control valve 15 a predetermined length of time after the
presence of the burner flame, so as to further close the valve plug
25 and extinguish the ignition flame. This design saves power and
fuel gas consumption.
[0033] The alternate form shown in FIG. 8 eliminates the ignition
flame control valve 15 shown in FIG. 7, enabling fuel gas to pass
from the main valve assembly 12 to the first gas outlet 21, the
subsidiary gas pipe 71, and then the ignition flame nozzle 72 for
producing the desired ignition flame. The posterior actions
including the operation of the high flame control switch 52, medium
flame control switch 53, or the low flame control switch 54 to
regulate the intensity of burner flame are same as the aforesaid
first embodiment of the present invention.
[0034] The alternate form shown in FIG. 9 eliminates the
normal-close valve 14 shown in FIG. 8. The operation of this
alternate form is same as the embodiment shown in FIG. 8.
[0035] The embodiment shown in FIG. 10 uses a cock 6 to substitute
for the operation unit 5 of the third embodiment (FIG. 8). The cock
6 has a gas inlet 61 and a gas outlet 62. The gas inlet 61 is
connected to fuel gas source and mounted with a wire gauze filter
63. The gas outlet 62 is connected to the gas inlet 20 of the valve
seat 11. The cock 6 closes/opens the fuel gas path, regulates the
flow rate of fuel gas, and switches on/off a micro switch 65. The
normal-open terminal and common terminal of the micro switch 65 are
respectively connected to the electronic igniter 8. When rotating
the rotary knob (not shown) of the cock 6 and depressing the
actuator 66 of the micro switch 65, the two terminals are
electrically connected to turn on the electronic igniter 8, and to
further open the normal-close valves 13 and 14, enabling fuel gas
to pass through the gas path 19 to the ignition flame nozzle 72 via
the first gas outlet 21, and at the same time the discharging
electrode 82 discharges a high voltage to produce sparks and to
ignite the desired ignition flame. After the presence of the
desired ignition flame, the sensor 83 outputs a signal to turn off
the discharging electrode 82 and to open the valve plugs 27 and 28
of the solenoid valves 17 and 18, and therefore fuel gas pass
through the solenoid valves 17 and 18 to the burner flame nozzle
tube 74 through the second gas outlet 22 and the main gas pipe 73
for producing the desired burner flame. By means of rotating the
rotary knob of the cock 6, the flow rate of fuel gas is regulated.
Because the cock 6 is of the known art, no further detailed
description is necessary.
[0036] FIG. 11 is a simplified design obtained from the embodiment
shown in FIG. 10. This embodiment eliminates the normal-close valve
14 and the solenoid valve 18 of the embodiment shown in FIG. 10,
and the cock 6 is used with the normal-close valve 13 and the
solenoid 17 to control the operation of the gas burner. The
operation principle of this embodiment is same as the embodiment
shown in FIG. 10.
[0037] It is to be understood that the drawings are designed for
purposes of illustration only, and are not intended for use as a
definition of the limits and scope of the invention disclosed.
* * * * *