U.S. patent application number 14/396163 was filed with the patent office on 2015-06-11 for biomass fuel oven.
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 | 20150159879 14/396163 |
Document ID | / |
Family ID | 49482099 |
Filed Date | 2015-06-11 |
United States Patent
Application |
20150159879 |
Kind Code |
A1 |
Zhu; Hongfeng ; et
al. |
June 11, 2015 |
BIOMASS FUEL OVEN
Abstract
A biomass fuel oven for use with biomass fuel granule. The oven
has a body which is able to be levelly 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 burning zone is defined beyond the fire grate
and an air supply zone is defined below the fire grate. A plurality
of air vents is defined in the fire grate. An air supply device is
provided at the burning zone. The air supply device has a tubular
inner wall and an air chamber surrounding the tubular inner wall.
The air supply zone is in communication to the air chamber and is
supplied air by an air blower via an air duct.
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: |
49482099 |
Appl. No.: |
14/396163 |
Filed: |
April 23, 2012 |
PCT Filed: |
April 23, 2012 |
PCT NO: |
PCT/CN2012/074494 |
371 Date: |
October 22, 2014 |
Current U.S.
Class: |
126/73 ;
126/77 |
Current CPC
Class: |
F24B 5/026 20130101;
F24B 5/06 20130101; F24B 1/08 20130101; F24B 1/024 20130101; F24B
13/02 20130101; F23L 9/02 20130101; F24B 5/025 20130101; F23K 3/14
20130101 |
International
Class: |
F24B 1/02 20060101
F24B001/02; F24B 13/02 20060101 F24B013/02; F24B 5/02 20060101
F24B005/02; F24B 1/08 20060101 F24B001/08 |
Claims
1. A biomass fuel oven for use with biomass fuel (70) granule and
comprising: a body (1) which is able to be levelly placed on the
ground, said body (1) having a top panel (11) and a side panel (12)
extending downward to the ground from said top panel (11) and
having a combustion cabinet (10) and an auxiliary equipment cabinet
(20), said combustion cabinet (10) having a burner (30) received
therein, said burner (30) having a fire grate (31), a burning zone
(32) being defined beyond said fire grate (31), an air supply zone
(33) being defined below said fire grate (31), a plurality of air
vents (311) being defined in said fire grate (31), an air supply
device (40) being provided at said burning zone (32), said air
supply device (40) having a tubular inner wall (41) and an air
chamber (42) surrounding said tubular inner wall (41), said air
supply zone (33) being in communication to said air chamber (42)
and being supplied air by an air blower (51) via an air duct (34),
said auxiliary equipment cabinet (20) having an electrical
equipment (50) received therein, said electrical equipment (50)
having said air blower (51), a power supply (52), and a switch
(53), at least one row of clockwise deflecting devices (43) and at
least one row of anticlockwise deflecting devices (44) are formed
on said tubular inner wall (41) of said air supply device (40).
2. The biomass fuel oven as claimed in claim 1, wherein each row of
said clockwise deflecting devices (43) has a plurality of first
slit (431), on an outer surface of said tubular inner wall (41), a
plurality of first deflectors (432) being respectively formed on
one same side of said first slits (431), each said first deflector
(432) extends towards corresponding said first slit (431) and
having an angle "a" with respect to an outer surface of said
tubular wall (41), angle "a" being between 0 and 90 degree, and
each row of said anticlockwise deflecting devices (44) has a
plurality of second slit (441), on said outer surface of said
tubular inner wall (41), a plurality of second deflectors (442)
being respectively formed on one same side different from said side
of said first deflectors (432) of said second slits (441), each
said second deflector (442) extends towards corresponding said
second slit (441) and having an angle "b" with respect to said
outer surface of the tubular wall, angle "b" being between 0 and 90
degree.
3. The biomass fuel oven as claimed in claim 1, wherein said
tubular inner wall (41) further has a plurality of turbulent air
supplier (45) defined therein.
4. The biomass fuel oven as claimed in claim 2, wherein said
tubular inner wall (41) further has a plurality of turbulent air
supplier (45) defined therein.
5. The biomass fuel oven as claimed in claim 3, wherein said
turbulent air supplier (45) has a plurality of turbulent holes
(451) defined in said tubular inner wall (41).
6. The biomass fuel oven as claimed in claim 4, wherein said
turbulent air supplier (45) has a plurality of turbulent holes
(451) defined in said tubular inner wall (41).
7. The biomass fuel oven as claimed in claim 3, wherein said
turbulent air supplier (45) is a thin tube (452) in communication
to said air chamber (42) and having a plurality of turbulent holes
(451') defined therein.
8. The biomass fuel oven as claimed in claim 4, wherein said
turbulent air supplier (45) is a thin tube (452) in communication
to said air chamber (42) and having a plurality of turbulent holes
(451') defined therein.
9. The biomass fuel oven as claimed in claim 3, wherein said
turbulent air supplier (45) is a plurality of thin tubes (453)
extending into said tubular inner wall (41) and having turbulent
holes (451'') at free ends thereof.
10. The biomass fuel oven as claimed in claim 4, wherein said
turbulent air supplier (45) is a plurality of thin tubes (453)
extending into said tubular inner wall (41) and having turbulent
holes (451'') at free ends thereof.
11. The biomass fuel oven as claimed in claim 3, wherein said
turbulent air supplier (45) is two thin tubes (454) in
communication to said air chamber (42) extending into said tubular
inner wall (41) and being in communication to a circular thin pipe
(455) having a plurality of turbulent holes (451''').
12. The biomass fuel oven as claimed in claim 4, wherein said
turbulent air supplier (45) is two thin tubes (454) in
communication to said air chamber (42) extending into said tubular
inner wall (41) and being in communication to a circular thin pipe
(455) having a plurality of turbulent holes (451''').
13. A biomass fuel oven for use with biomass fuel (70) granule and
comprising: a body (1) which is able to be levelly placed on the
ground, said body (1) having a top panel (11) and a side panel (12)
extending downward to the ground from the top panel (11) and having
a combustion cabinet (10) and an auxiliary equipment cabinet (20),
said combustion cabinet (10) having a burner (30) received therein,
said burner (30) having a fire grate (31), a burning zone (32)
being defined beyond said fire grate (31), an air supply zone (33)
being defined below said fire grate (31), a plurality of air vents
(311) being defined in said fire grate (31), an air supply device
(40) being provided at said burning zone (32), said air supply
device (40) having a tubular inner wall (41) and an air chamber
(42) surrounding said tubular inner wall (41), said air supply zone
(33) and said air chamber (42) being respectively in communication
to said air blower (51), said auxiliary equipment cabinet (20)
having an electrical equipment (50) and a fuel supply mechanism
(60) received therein, said fuel supply mechanism (60) has a hopper
(61) having a lower outlet (611), a fuel tube (62) having one end
in communication to said lower outlet (611) of said hopper (61) and
a free end extending into said burning zone (32), and a rotary vane
feeder 63 rotatably received in said fuel tube (62), said
electrical equipment (50) having said air blower (51), a power
supply (52), and a switch (53), at least one row of clockwise
deflecting devices (43) and at least one row of anticlockwise
deflecting devices (44) are formed on the tubular inner wall (41)
of the air supply device (40).
14. The biomass fuel oven as claimed in claim 13, wherein each row
of said clockwise deflecting devices (43) has a plurality of first
slit (431), on an outer surface of said tubular inner wall (41), a
plurality of first deflectors (432) being respectively formed on
one same side of said first slits (431), each said first deflector
(432) extends towards corresponding said first slit (431) and
having an angle "a" with respect to an outer surface of said
tubular wall (41), angle "a" being between 0 and 90 degree, and
each row of said anticlockwise deflecting devices (44) has a
plurality of second slit (441), on said outer surface of said
tubular inner wall (41), a plurality of second deflectors (442)
being respectively formed on one same side different from said side
of said first deflectors (432) of said second slits (441), each
said second deflector (442) extends towards corresponding said
second slit (441) and having an angle "b" with respect to said
outer surface of the tubular wall, angle "b" being between 0 and 90
degree.
15. The biomass fuel oven as claimed in claim 13, wherein said
tubular inner wall (41) further has a plurality of turbulent air
supplier (45) defined therein.
16. The biomass fuel oven as claimed in claim 14, wherein said
tubular inner wall (41) further has a plurality of turbulent air
supplier (45) defined therein.
17. The biomass fuel oven as claimed in claim 15, wherein said
turbulent air supplier (45) has a plurality of turbulent holes
(451) defined in said tubular inner wall (41).
18. The biomass fuel oven as claimed in claim 16, wherein said
turbulent air supplier (45) has a plurality of turbulent holes
(451) defined in said tubular inner wall (41).
19. The biomass fuel oven as claimed in claim 15, wherein said
turbulent air supplier (45) is a thin tube (452) in communication
to said air chamber (42) and having a plurality of turbulent holes
(451') defined therein.
20. The biomass fuel oven as claimed in claim 16, wherein said
turbulent air supplier (45) is a thin tube (452) in communication
to said air chamber (42) and having a plurality of turbulent holes
(451') defined therein.
21. The biomass fuel oven as claimed in claim 15, wherein said
turbulent air supplier (45) is a plurality of thin tubes (453)
extending into said tubular inner wall (41) and having turbulent
holes (451'') at free ends thereof.
22. The biomass fuel oven as claimed in claim 16, wherein said
turbulent air supplier (45) is a plurality of thin tubes (453)
extending into said tubular inner wall (41) and having turbulent
holes (451'') at free ends thereof.
23. The biomass fuel oven as claimed in claim 15, wherein said
turbulent air supplier (45) is two thin tubes (454) in
communication to said air chamber (42) extending into said tubular
inner wall (41) and being in communication to a circular thin pipe
(455) having a plurality of turbulent holes (451''').
24. The biomass fuel oven as claimed in claim 16, wherein said
turbulent air supplier (45) is two thin tubes (454) in
communication to said air chamber (42) extending into said tubular
inner wall (41) and being in communication to a circular thin pipe
(455) having a plurality of turbulent holes (451''').
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 a
turbulent flow air supply in a flame zone to highly increase a use
ratio of 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 conventional biomass fuel oven is disclosed in a PCT
patent application PCT/CN2012/01746 "A High Performance Oven" by
this applicant. As shown in FIGS. 14 and 15, the oven has a body 9
having a combustion cabinet 91 and an auxiliary equipment cabinet
92. The combustion cabinet has a burner 93 received therein. The
burner 93 has a fire grate 931. A burning zone 932 is defined
beyond the tire grate 931 and an air supply zone 933 is defined
below the fire grate 931. A flame zone 934 is above the burning
zone 932 of the burner 93. An air supply device 94 is provided at
the flame zone 934. The air supply device 94 has a tubular inner
wall 941, an enclosed air chamber 942, and an air duct 943
connecting the air chamber 942 and the air supply zone 933. A
plurality of deflecting devices 95 are longitudinally formed on the
tubular inner wall 941 of the air supply device 94. Each deflecting
device 95 has a long slit 951. On an outer surface of the tubular
inner wall 941, a deflector 952 are formed all on a same side, left
or right, of the long slits 951. Each deflector 952 extends towards
corresponding long slit 951 and having an angle with respect to the
outer surface of the tubular wall 941. The angle is between 0 and
90 degree.
[0009] The aforementioned way of air supplying resolves the problem
of air interference between flows from each deflecting device, but
the oven still has technical drawbacks. The deflecting device 95
forms an air flow going spirally upward like a tornado in the flame
zone 934 in the tubular wall 941 of the air supply device 94. The
spiral air flow resolves the interference between flows of
supplying air and provides oxygen for combustion. However, just
because of the unidirectionality of the flow of the supplying air,
the oxygen in the supplying air is not able to completely mix with
a burning gas, which results in an incomplete burning. Secondly,
also because of the unidirectionality of the flow, without any
impediment, an upgoing velocity of flow will be quick, which will
quickly take away heat and some incompletely burn gas. This will
bring further waste of energy. Third, since the incomplete burning
caused by above two reasons, a carbon granule density of the
incomplete burning gas of the waste gas will be high. An outward
phenomena is thick smoke. Forth, heat in the flame zone 934 in the
air supply device 94 is always being taken away quickly and no high
temperature is able to be produced.
[0010] Furthermore, for conventional biomass fuel ovens, form of
the flames in the hearth 91 is relatively disperse and not
controllable. It is difficult to concentrate the flames to increase
a use ratio of heat energy.
BRIEF SUMMARY OF THE INVENTION
[0011] The main object of the invention is to provide a biomass
fuel oven which is able to avoid interference between supplying air
flows, and at the same time, to completely mix oxygen in the
supplying air with burning gas to make a fuller combustion.
[0012] Another object of the invention is to provide a biomass fuel
oven which is able to slow down an upgoing velocity of the burning
gas in the flame zone to achieve a higher temperature for
heating.
[0013] In order to accomplish the above objects, the present
invention provides a biomass fuel oven for use with biomass fuel
granule. The oven has a body which is able to be levelly placed on
the ground. The body has a top panel and a side panel extending
downward to the ground from the top panel. The body further has a
combustion cabinet and an auxiliary equipment cabinet. The
combustion cabinet has a burner received therein. The burner has a
fire grate. A burning zone is defined beyond the fire grate and an
air supply zone is defined below the fire grate. A plurality of air
vents is defined in the fire grate. An air supply device is
provided at the burning zone. The air supply device has a tubular
inner wall and an air chamber surrounding the tubular inner wall.
The air supply zone is in communication to the air chamber and is
supplied air by an air blower via an air duct, the auxiliary
equipment cabinet has an electrical equipment received therein. The
electrical equipment has the air blower, a power supply, and a
switch. At least one row of clockwise deflecting devices and at
least one row of anticlockwise deflecting devices are formed on the
tubular inner wall of the air supply device.
[0014] The beneficiary effects of the invention are as follows. The
air flows entering into the flame zone respectively from the
clockwise and anticlockwise deflecting devices are able to fully
mix oxygen in the supplying air with burning gas, which makes a
more complete combustion and increases use ratio of energy. At the
same time, compared with the conventional single spiral air flow,
an interference between the two countering air flows decrease an
up-going velocity of high temperature of burning gas. A longer
lingering time in the flame zone of the burning gas will be able to
obtain a higher burning temperature. In testing experiments, the
oven of the invention is able to increase temperature by 20-30
percent compared to conventional biomass fuel ovens. Thirdly,
because of the complete combustion, a density of carbon granule in
the waste gas decrease greatly. There is no more black smoke
produced from flames.
[0015] 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
[0016] FIG. 1 is a schematic perspective view of the preferred
embodiment of the invention.
[0017] FIG. 2 is an exploded perspective view of the oven shown in
FIG. 1.
[0018] FIG. 3a is a top plane view of a the oven shown in FIG.
1.
[0019] FIG. 3b is a cross-sectional view along direction A-A shown
in FIG. 3a.
[0020] FIG. 4 is a perspective partial view of a burner and an
tubular inner wall of an air supply device.
[0021] FIG. 5 is a top plane view of the burner and the tubular
inner wall of the air supply device.
[0022] FIG. 6 is a circuit diagram of an electrical equipment of
the oven shown in FIG. 1.
[0023] FIG. 7 is a schematic perspective view of another embodiment
of the invention.
[0024] FIG. 8 is an exploded perspective view of the oven shown in
FIG. 7.
[0025] FIG. 9 is a cross-sectional plane view of the oven shown in
FIG. 7.
[0026] FIG. 10 is an enlarged perspective partial view of the air
supply device shown in FIG. 7.
[0027] FIG. 11 is an enlarged plane partial view of the tubular
inner wall shown in FIG. 10.
[0028] FIG. 12 is a circuit diagram of an electrical equipment of
the oven shown in FIG. 7.
[0029] FIG. 13a through 13c are enlarged perspective view of three
other air supply devices of the invention.
[0030] FIG. 14 is a cross-sectional plane view of a conventional
biomass fuel oven having air supply device. And,
[0031] FIG. 15 is an enlarged plane view of a tubular inner wall of
the air supply device shown in FIG. 14.
DETAILED DESCRIPTION OF THE INVENTION
[0032] FIG. 1 is a schematic perspective view of the preferred
embodiment of a biomass fuel oven of the invention. The oven has a
body 1 which is able to be levelly placed on the ground. The body 1
has a top panel 11 and a side panel 12 extending downward to the
ground from the top panel 11. The body 1 has a combustion cabinet
10 and an auxiliary equipment cabinet 20 received therein.
[0033] Together with reference to FIGS. 3a and 3b, the combustion
cabinet 10 has a burner 30 and an air supply device 40 received
therein. The burner 30 has a fire grate 31. A burning zone 32 is
defined beyond the fire grate 31 and an air supply zone 33 is
defined below the fire grate 31. A plurality of air vents 311 are
defined in the fire grate 31. The air supply device 40 has a
tubular inner wall 41 and an air chamber 42 surrounding the tubular
inner wall 41. In this embodiment, the air supply zone 33 is in
communication to the air chamber 42, and being supplied air by an
air blower 51 via an air duct 34. The tubular inner wall 41 defines
a flame zone 35 therewithin by the wall thereof.
[0034] Together with reference to FIGS. 4 and 5, at least one row
of clockwise deflecting devices 43 and at least one row of
anticlockwise deflecting devices 44 are formed on the tubular inner
wall 41. Each row of clockwise deflecting devices 43 has a
plurality of first slit 431. On an outer surface of the tubular
inner wall 41, a plurality of first deflectors 432 is respectively
formed on one same side, left or right, of the first slits 431.
Each first deflector 432 extends towards corresponding first slit
431 and having an angle "a" with respect to an outer surface of the
tubular wall 41. Angle "a" is between 0 and 90 degree, preferably
45 degree. In the shown embodiment, all first deflectors 432 are on
the left side of corresponding first slit 431 and extend towards
corresponding first slit 431, i.e., towards right. Each row of
anticlockwise deflecting devices 44 has a plurality of second slit
441. On the outer surface of the tubular inner wall 41, a plurality
of second deflectors 442 is respectively formed on one same side
different from the side of the first deflectors 432 of the second
slits 441. Each second deflector 442 extends towards corresponding
second slit 441 and having an angle "b" with respect to an outer
surface of the tubular wall 41. Angle "b" is between 0 and 90
degree, preferably 45 degree. In the shown embodiment, all second
deflectors 442 are on the right side of corresponding second slit
441 and extend towards corresponding second slit 441, i.e., towards
left.
[0035] In the shown embodiment, the auxiliary equipment cabinet 20
has an electrical equipment 50 received therein. The electrical
equipment 50, as shown in FIG. 6, has the air blower 51 for
supplying air to the air supply zone 33 of the burner 30 and the
air chamber 42, a power supply 52, a switch 53 and a power light
54. The power supply 52 may be an independent alternating
current/direct current power supply 521, having or having not a
storage battery 522 in parallel as auxiliary. Either the
alternating current/direct current power supply 521 or the storage
battery 522 is able to supply power independently. The switch 53 is
installed on the side panel 12 and able to control the power supply
of whole circuit. The power light 54 is also installed on the side
panel 12 near the switch 53 and used to indict status of power
supply.
[0036] Fuel 70 is biomass fuel granule made by smashed and then
briquetted straw, bits of wood, or crop stalks.
[0037] In use, a user is able to first stably place the body 1 of
the oven on the ground where is desirable and then load fuel 70
onto the fire grate 31 of the burner 30 through the flame zone 35
defined by the tubular inner wall 41 of the air supply device 40 in
the combustion cabinet 10. When the user turns on the switch 53,
the power light 54 turns up, which means the electrical circuit is
closed and the oven starts to work. At this time, the user is able
to ignite the fuel 70 by throwing a burning alcohol cotton ball
onto the fuel 70 on the fire grate 31. Also at this time, the air
blower 51 start to supply air to the air supply zone 33 and the air
chamber 42. Air entering the air supply zone 33 through the air
vents 311 in the fire grate 31 provides oxygen for combustion of
the fuel 70 in the burning zone 32. Air entering the air chamber 42
goes into the flame zone 35 defined by the tubular inner wall 41
through all clockwise deflecting devices 43 and all anticlockwise
deflecting devices 44. Methane gas is created in a process of
burning of the fuel 70. With air flow produced by the air blower
51, the methane gas burns into flames. Different to the
conventional way of air supplying to the flame zone 35, air
entering the flame zone 35 through each clockwise deflecting device
43 unidirectionally flows clockwise after passing by each first
deflector 432. Therefore, the air in the flame zone 35 from the
clockwise deflecting device 43 is in a form of unidirectional
spiral. At the same time, air entering the flame zone 35 through
each anticlockwise deflecting device 44 unidirectionally flows
anticlockwise after passing by each second deflector 442.
Therefore, the air in the flame zone 35 from the anticlockwise
deflecting device 44 is in a form of unidirectional spiral opposite
to the air flow from the clockwise deflecting device 43. The air
flows entering into the flame zone 35 respectively from the
clockwise and anticlockwise deflecting devices 43 and 44 are able
to fully mix oxygen in the supplying air with burning gas, which
makes a more complete combustion and increases use ratio of energy.
At the same time, compared with the conventional single spiral air
flow, an interference between the two countering air flows decrease
an up-going velocity of high temperature of burning gas. A longer
lingering time in the flame zone 35 of the burning gas will be able
to obtain a higher burning temperature. In testing experiments, the
oven of the invention is able to increase temperature by 20-30
percent compared to conventional biomass fuel ovens.
[0038] The tubular inner wall 41 may further has a plurality of
turbulent air supplier 45 defined therein. The turbulent air
supplier 45 may be any mechanism which is able to supply air to the
flame zone 35 in the tubular inner wall 41. As shown in FIG. 4, the
embodiment of the turbulent air supplier 45 has a plurality of
turbulent holes 451 defined in the tubular inner wall 41. After the
air blower 51 is turned on, supplying air enters into the flame
zone 35 defined by the tubular inner wall 41 not only through the
clockwise and the anticlockwise deflecting devices 43 and 44, but
also through the turbulent holes 451 of the turbulent air supplier
45. The air flows entering into the flame zone 35 through the
turbulent air supplier 45 are able to further mix up oxygen in the
supplying air and the burning gas and further increase the use
ratio of energy. At the same time, the air flows entering into the
flame zone 35 through the turbulent air supplier 45 are able to
further decrease the up-going velocity of the burning gas, thus
further increase the temperature of the burning in the oven. Shown
in FIGS. 13a, 13b and 13c are three other embodiments of the
turbulent air supplier 45. In the embodiment shown in FIG. 13a, the
turbulent air supplier 45 is a thin tube 452 in communication to
the air chamber 42 and having a plurality of turbulent holes 451'
defined therein. In the embodiment shown in FIG. 13b, the turbulent
air supplier 45 is a plurality of thin tubes 453 extending into the
tubular inner wall 41 and having turbulent holes 451'' at free ends
thereof. In the embodiment shown in FIG. 13c, the turbulent air
supplier 45 is two thin tubes 454 in communication to the air
chamber 42 extending into the tubular inner wall 41 and being in
communication to a circular thin pipe 455 having a plurality of
turbulent holes 451'''.
[0039] Shown in FIGS. 7, 8 and 9 is another embodiment of the
invention. Compared with the preferred embodiment, the air supply
zone 33 of the burner 30 in this embodiment is not directly in
communication to the air chamber 42 of the air supply device 40.
The air supply zone 33 and the air chamber 42 are respectively in
communication to the air blower 51. A second difference is that
besides the electrical equipment 50, the auxiliary equipment
cabinet 20 further has a fuel supply mechanism 60 received therein.
The fuel supply mechanism 60 has a hopper 61 having a lower outlet
611, a fuel tube 62 having one end in communication to the lower
outlet 611 of the hopper 61 and a free end extending into the
burning zone 32, and a rotary vane feeder 63 rotatably received in
the fuel tube 62. The electrical equipment 50, as shown in FIG. 12,
has the air blower 51 for supplying air to the air supply zone 33
of the burner 30 and the air chamber 42, a power supply 52, a
switch 53, a power light 54, and a feeding motor 55 for driving the
rotary vane feeder 63. The switch 53 is installed on the side panel
12 and able to control the power supply of whole circuit. The power
light 54 is also installed on the side panel 12 near the switch 53
and used to indict status of power supply. A door 121 is able to be
provided in the side panel 12.
[0040] A shape of the tubular inner wall 41 does not have to be
strictly tubular having a single diameter as shown in the preferred
embodiment but be able to be any shape which is basically a round
tube such as a tube having wave or a complex shape as an inner tube
of a washing machine, as shown in FIGS. 10 and 11. The tubular
inner wall 41 shown in FIG. 7 has a shape of cone having a diameter
of end being greater than a diameter of the other end. Also in the
embodiment shown in FIG. 7, all the first and the second slits 431
and 441 of the clockwise and the anticlockwise deflecting devices
43 and 44 are a thin slit having an angle "c" with respect to a
generatrix "g" of the tubular inner wall 41. Angle "c" is between 0
and 45 degree, preferably 15 degree.
[0041] When the user needs to stop the burning, he is able to turn
off the switch 64, and the power light 65 goes out. The feeding
motor 61 stops rotating, and the air blower 62 ceases. As there is
no new supply of fuel 70, the fuel 70 in the burning zone 32 will
burn up in a very short time period. The user then is able to open
the door 121 and collect ash in the air supply zone 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.
[0042] 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.
* * * * *