U.S. patent application number 14/351143 was filed with the patent office on 2014-09-11 for oven having an enclosed heat exchange zone.
This patent application is currently assigned to Hongfeng Zhu. The applicant listed for this patent is Qianxi Chen, Hongfeng Zhu. Invention is credited to Qianxi Chen, Hongfeng Zhu.
Application Number | 20140251299 14/351143 |
Document ID | / |
Family ID | 48081352 |
Filed Date | 2014-09-11 |
United States Patent
Application |
20140251299 |
Kind Code |
A1 |
Zhu; Hongfeng ; et
al. |
September 11, 2014 |
OVEN HAVING AN ENCLOSED HEAT EXCHANGE ZONE
Abstract
An oven has an enclosed heat exchange zone for use with biomass
fuel. The oven has a body which is able to be placed on the ground.
The body has a combustion cabinet and an auxiliary equipment
cabinet. The combustion cabinet has a burner received therein. The
burner has a fire grate, a side plate, a blowing space, and a
hearth. A heat exchange zone is defined by the surrounding tubular
inner wall; a side heating zone being defined by a tubular inner
and a tubular outer walls. A chimney is formed on the tubular outer
wall in communication with an upper portion of the side heating
zone. An opening is defined in the top of the combustion cabinet
right above the tubular inner wall.
Inventors: |
Zhu; Hongfeng; (Yiwu,
CN) ; Chen; Qianxi; (Yiwu, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Zhu; Hongfeng
Chen; Qianxi |
Yiwu
Yiwu |
|
CN
CN |
|
|
Assignee: |
Zhu; Hongfeng
Yiwu, Zhejiang
CN
|
Family ID: |
48081352 |
Appl. No.: |
14/351143 |
Filed: |
October 11, 2011 |
PCT Filed: |
October 11, 2011 |
PCT NO: |
PCT/CN2011/080668 |
371 Date: |
April 11, 2014 |
Current U.S.
Class: |
126/77 ;
126/289 |
Current CPC
Class: |
F24B 1/188 20130101;
F24B 1/189 20130101; F24B 1/191 20130101; F24B 1/1886 20130101;
F24B 1/182 20130101 |
Class at
Publication: |
126/77 ;
126/289 |
International
Class: |
F24B 1/182 20060101
F24B001/182; F24B 1/189 20060101 F24B001/189; F24B 1/188 20060101
F24B001/188 |
Claims
1. An oven having an enclosed heat exchange zone for use with
biomass fuel comprising: a body which is able to be placed on the
ground, said body having a combustion cabinet and an auxiliary
equipment cabinet, said combustion cabinet having a burner received
therein, said burner having a fire grate, a side plate extending
upward from a peripheral of said fire grate, a blowing space
beneath said fire grate, and a hearth defined by said fire grate
and said surrounding side plate, a plurality of air vents being
defined in said fire grate, a heating portion being above said
burner, said heating portion having a tubular inner wall and a
tubular outer wall, a heat exchange zone being defined by said
surrounding tubular inner wall, a side heating zone being defined
by said tubular inner and said tubular outer walls, a plurality of
flame vents being defined in a lower portion of said tubular inner
wall near said burner, a chimney being formed on said tubular outer
wall in communication with an upper portion of said side heating
zone, an opening being defined in said top of said combustion
cabinet right above said tubular inner wall, said auxiliary
equipment cabinet having a fuel supply mechanism and an electrical
equipment received therein, said fuel supply mechanism having a
hopper, a fuel tube having one end in communication with said
hopper and a free end extending into said hearth, and a rotary vane
feeder rotatably received in said fuel tube, said electrical
equipment having a feeding motor driving said rotary vane feeder,
an air blower for supplying air to said blowing space, a power
supply, and a switch.
2. The oven as claimed in claim 1, wherein a circular stage is
defined in an inner surface of said tubular inner wall above said
flame vents.
3. The oven as claimed in claim 1, wherein an ignition bar window
is defined in said fire gate, and said electrical equipment further
has an ignition bar being installed in said blowing space, said
ignition bar being exposed to said hearth through said ignition bar
window and powered by said power supply.
4. The oven as claimed in claim 2, wherein an ignition bar window
is defined in said fire grate, and said electrical equipment
farther has an ignition bar being installed in said blowing space,
said ignition bar being exposed to said hearth through said
ignition bar window and powered by said power supply.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] Not Applicable
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
[0002] Not Applicable
INCORPORATION-BY-REFERENCE OF MATERIAL SUBMITTED ON A COMPACT
DISC
[0003] Not Applicable
BACKGROUND OF THE INVENTION
[0004] 1. Field of the Invention
[0005] The invention relates to an oven for use with biomass fuel,
and more particularly, to an oven using granule made by smashed and
then briquetted straw, bits of wood, or crop stalks and having an
enclosed heat exchange zone which is able to much increase a use
ratio of heat energy.
[0006] 2. Description of Related Art
[0007] Biomass fuel is granule made by smashed and then briquetted
straw, bits of wood, or crop stalks. As a new energy solution,
biomass fuel has wider and wider been used because it is hygienic,
environmental, high efficient, and economic.
[0008] A type traditional biomass oven is disclosed in a Chinese
utility model paten "A Heat Storage Oven" numbered CN201903090U. As
shown in FIG. 5, the oven has a burning chamber (not shown), in
which biomass fuel burns. A hearth 91 is provided right above the
burning chamber. The hearth 91 has a top opening 92. A top kitchen
range 96 is provided around the top opening 92. A zone above the
top kitchen range 96 and right beyond the top opening 92 is a heat
exchange zone 93. A heating or cooking appliance such as a pot
containing food or water is able to be put above the heat exchange
zone 93 on the top kitchen range 96. Or food needs to be heat is
able to be placed above the heat exchange zone 93 directly. Flames
generated in the burning chamber goes out of the top opening 92
through the hearth 91 and heats the food or cooking appliance at
the heat exchange zone 93. A supplemental air supply chamber 94 may
be provided around an outer surface of top portion of the hearth. A
plurality of air supply vents 95 are defined in a wall of the
hearth 91 in communication with the supplemental air supply chamber
94. An air pipe (not shown) is provided in communication with an
inlet of the supplemental air supply chamber 94 and supplies air
for the hearth 91 through the supplemental air supply chamber 94
and the air supply vents 95. The supplemental air supply chamber 94
is able to make the unburned gas in the hearth 91 burn completely
thus increasing an efficiency of combustion. An air pollution
caused by the unburned gas is also able to be decreased.
[0009] However, this traditional oven still has a problem of energy
waste because an open heat exchange zone 93 will cause a heavy loss
of heat of flames into the environment.
BRIEF SUMMARY OF THE INVENTION
[0010] The main object of the invention is to provide an oven
having an enclosed heat exchange zone which is able to decrease
waste of heat energy and has a higher energy use ratio than the
traditional biomass oven.
[0011] In order to accomplish the above objects, the present
invention provides an oven having an enclosed heat exchange zone
for use with biomass fuel. The oven has a body which is able to be
placed on the ground. The body has a combustion cabinet and an
auxiliary equipment cabinet. The combustion cabinet has a burner
received therein. The burner has a fire grate, a side plate
extending upward from a peripheral of the fire grate, a blowing
space beneath the fire gate, and a hearth defined by the fire grate
and the surrounding side plate. A plurality of air vents are
defined in the fire grate. A heating portion is above the burner.
The heating portion has a tubular inner wall and a tubular outer
wall. A heat exchange zone is defined by the surrounding tubular
inner wall; a side heating zone being defined by the tubular inner
and the tubular outer walls. A plurality of flame vents are defined
in a lower portion of the tubular inner wall near the burner. A
chimney is formed on the tubular outer wall in communication with
an upper portion of the side heating zone. An opening is defined in
the top of the combustion cabinet right above the tubular inner
wall. The auxiliary equipment cabinet has a fuel supply mechanism
and an electrical equipment received therein. The fuel supply
mechanism has a hopper, a fuel tube having one end in communication
with the hopper and a free end extending into the hearth, and a
rotary vane feeder rotatably received in the fuel tube. The
electrical equipment has a feeding motor driving the rotary vane
feeder, an air blower for supplying air to the blowing space, a
power supply, and a switch.
[0012] The bonfire oven of the invention has following beneficial
effects. In a whole process of heat exchange, the heat exchange
zone is enclosed. Flames are able to heat both directly in the heat
exchange zone, and complementarily in the side heating zone. Much
less heat will lose as the open heat exchange zone in the
traditional oven. Therefore, the heat energy is high efficiently
used in the oven of the invention.
[0013] These and other objectives, features, and advantages of the
present invention will become apparent from the following detailed
description, the accompanying drawings, and the appended
claims.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0014] FIG. 1 is a schematic perspective view of the preferred
embodiment of an oven of the invention.
[0015] FIG. 2 is atop plan view of the oven shown in FIG. 1.
[0016] FIG. 3 is a cross-sectional plan view along the direction
A-A shown in FIG. 2.
[0017] FIG. 4 is a circuit diagram of an electrical equipment of
the oven shown in FIG. 1. And,
[0018] FIG. 5 is a cross-sectional schematic plan view of a
traditional biomass fuel oven.
DETAILED DESCRIPTION OF THE INVENTION
[0019] Shown in FIG. 1 is the preferred embodiment of an oven
having an enclosed heat exchange zone of the invention. The oven
has a body 1 which is able to be placed on the ground. The body 1
has a combustion cabinet 10 and an auxiliary equipment cabinet
20.
[0020] With reference to FIGS. 2 and 3, the combustion cabinet 10
has a bottom 11 which is able to be placed on the ground levelly, a
side 12 extending upward from a peripheral of the bottom 11, and a
top 13 in communication with an upper peripheral of the side 12 and
opposite to the bottom 11. An openable door 121 is provided in the
side 12.
[0021] The combustion cabinet 10 has a burner 30 received therein.
The burner 30 has a fire grate 31, a side plate 32 extending upward
from a peripheral of the fire grate 31, and a blowing space 33
beneath the fire grate 31. A hearth 34 is defined by the fire grate
31 and the surrounding side plate 32. A plurality of air vents 311
are defined in the fire grate 31. An ignition bar window 312 may be
defined in the fire grate 31, too. An ignition bar 61 may be
installed in the blowing space 33 and exposed to the hearth 34
through the ignition bar window 312.
[0022] A heating portion 40 is above the burner 30. The heating
portion 40 has a tubular inner wall 41 and a tubular outer wall 42.
A heat exchange zone 43 is defined by the surrounding tubular inner
wall 41. A side heating zone 44 is defined by the tubular inner and
the tubular outer walls 41, 42. A plurality of flame vents 411 are
defined in a lower portion of the tubular inner wall 41 near the
burner 30. The plurality of flame vents 411 may be in a circular
row having equal distance with each other, as shown in this
preferred embodiment. A chimney 45 is formed on the tubular outer
wall 42 in communication with an upper portion of the side heating
zone 44. The chimney 45 goes out of the body 1 through the
auxiliary equipment cabinet 20. An opening 131 is defined in the
top 13 of the combustion cabinet 10 right above the tubular inner
wall 41. An oven lid (not shown) may be provided covering on the
opening 131. A circular stage 412 may be defined in an inner
surface of the tubular inner wall 41 above the flame vents 411. The
circular stage 412 is suitable for supporting a pot (not
shown).
[0023] The auxiliary equipment cabinet 20 has a fuel supply
mechanism 50 and an electrical equipment 60 received therein. The
fuel supply mechanism 50 has a hopper 51, a fuel tube 52 having one
end in communication with the hopper 51 and a free end extending
into the hearth 34, and a rotary vane feeder 53 rotatably received
in the fuel tube 52. The electrical equipment 60, as shown in FIG.
4, has the ignition bar 61, a feeding motor 62 driving the rotary
vane feeder 53, an air blower 63 being able to supply air to the
blowing space 33, a power supply 64, a switch 65 and a power light
66. The power supply 64 may be an independent alternating
current/direct current power supply 641, having or having not a
storage battery 642 in parallel as auxiliary. Either the
alternating current/direct current power supply 641 or the storage
battery 642 is able to supply power independently. The switch 65 is
installed on the auxiliary equipment cabinet 20 and able to control
the power supply of whole circuit. The power light 66 is also
installed on the auxiliary equipment cabinet 20 near the switch 65
and used to indict status of power supply.
[0024] Fuel 70 is biomass fuel granule made by smashed and then
briquetted straw, bits of wood, or crop stalks.
[0025] In use, a user is able to first place smooth the body 1 of
the oven on the ground where is desirable and then load fuel 70
into the hopper 51. The user is able to either put water or food
directly into the heat exchange zone 43 and then place the oven lid
on the opening 131 of the top 13, or place a pot having a shape
matching the tubular inner wall 41 onto the stage 412 within the
heat exchange zone 43. When the user turns on then switch 65, the
power light 66 turns up, which means the electrical circuit is
closed and the oven starts to work. The feeding motor 62 starts to
rotate, driving the rotary vane feeder 53 to send the fuel 70 into
the burner 30. Biomass fuel granule falls onto the fire grate 31
under the gravity. At this time, the ignition bar 61 is electrified
and becomes red-hot and will ignite the fuel 70 on the fire grate
31 through the ignition bar window 312. At this time too, the air
blower 63 start to supply air to the blowing space 33. Air enters
the hearth 34 through the air vents 311 in the fire grate 31 and
provides oxygen for combustion of the fuel 70. Methane gas is
created in a process of burning of the fuel 70. With air flow
produced by the air blower 63, the methane gas burns into flames.
In whichever situation, the food being directly put in the heat
exchange zone 43 and then the oven lid being placed one the opening
131, or the pot being put on the stage 412 within the heat exchange
zone 43, the heat exchange zone 43 is an enclosed space. The only
passageway of flames is through the flame vents 411, the side
heating space 44 and then the chimney 45. After the fuel 70 is able
to sustainably burn, the circuit may turn of the ignition bar 61 to
save electrical power. The user is able to process the food by
opening the oven lid or a pot lid at any time.
[0026] When the user needs to stop the burning, he is able to turn
off the switch 65, and the power light 66 goes out, the feeding
motor 62 stops to rotate, and the air blower 63 ceases. As there is
no new supply of fuel 70, the fuel in the hearth 34 will burn up in
a very short time period. The user then is able to open the door
121 and collect ash in the blowing space 33. Outer region of the
fire grate 31 may be oblique upward in a certain degree in order to
form a central depression. The central depression is useful to
gather fuel together to avoid black smoke caused by insufficient
burning of the outer region fuel 70.
[0027] From above description, it is seen that the objects of the
present invention have been fully and effectively accomplished.
Embodiment of the invention has been shown and described for the
purposes of illustrating the functional and structural principles
of the present invention and is subject to change without departure
from the invention's principles. Therefore, this invention includes
all modifications encompassed within the spirit and scope of the
following claims.
* * * * *