CN111076223A

CN111076223A - Normally open fire device and gas stove thereof

Info

Publication number: CN111076223A
Application number: CN201911363914.3A
Authority: CN
Inventors: 俞银德
Original assignee: Yu Roubing
Current assignee: Yu Roubing
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-04-28

Abstract

A constant open flame device includes a cover, a support plate, a first gas supply pipe, a second gas supply pipe and a pair of ignition components; the bottom end of the cover is open, and a nozzle is connected to the side wall , each ignition assembly has a conduit, the upper ends of the first air supply pipe, the second air supply pipe and the conduits of the pair of ignition assemblies are sealingly connected to the hole wall of the corresponding through hole of the support plate, the cover The shell is covered on the support plate, and the spark pins of the pair of spark assemblies are located in the cover. The constant open flame produced by the device has stable flame, high concentration, strong and powerful, and can ignite the main combustion gas at any time to form the main combustion, and no carbon monoxide is produced. The invention also discloses a gas stove with the device.

Description

Normally open fire device and gas stove thereof

Technical Field

The invention relates to a stove, in particular to a normally open fire device and a gas stove thereof.

Background

A gas range in use is shown in fig. 1 to 7.

Referring to fig. 1 and 2, the gas range 1000 has a burner body 400, a main burner 500 for combustible gas, and a normally open flame unit 600.

Referring to fig. 1 and 2, the cooking range body 400 has a chamber inner circumference heat absorption water tank 410, a chamber outer circumference heat absorption water tank 420, and an outer lateral heat absorption water tank 430. The outer transverse heat absorption water tank 430 has an inner rectangular cylinder 431 and an outer rectangular cylinder 432, and a space between an outer surface of the inner rectangular cylinder 431 and an inner surface of the outer rectangular cylinder 432 is a space where the outer transverse heat absorption water tank 430 receives water. The bottom of the hearth inner ring heat absorption water tank 410 is communicated with the bottom of the hearth outer ring heat absorption water tank 420. The furnace outer ring heat absorption water tank 420 is communicated with the space of the outer transverse heat absorption water tank 430 for containing water. A short tube 480 connects the head space of the furnace inner ring heat absorption water tank 410 with the head space of the furnace outer ring heat absorption water tank 420. The space between the outer wall plate of the hearth inner ring heat absorption water tank 410 and the inner wall plate of the hearth outer ring heat absorption water tank 20 is an inner annular flue gas channel 421 of the oven body 400. The inner rectangular cylinder 431 is a transverse flue gas channel of the oven body 400. The inner annular flue gas channel 421 communicates with the space enclosed by the inner rectangular cylinder 431 as a transverse flue gas channel. The top wall plate of the hearth inner ring heat absorption water tank 410 extends outwards and is welded with the inner cylinder wall plate of the hearth outer ring heat absorption water tank 420 in a sealing mode to form an annular top plate 413, the upper part of the internal flue gas channel 121 is sealed, a plurality of through holes are formed in the annular top plate 413, or four through holes 414 are formed in the annular top plate 413 far away from the external transverse heat absorption water tank 430, so that the upper hearth 411 formed by the space surrounded by the part, located above the annular top plate 413, of the inner cylinder wall plate of the hearth outer ring heat absorption water tank 420 is communicated with the internal annular flue gas channel 421. A plurality of communicating pipes 434 are hermetically welded between the top wall plate and the bottom wall plate of the internal rectangular cylinder 431 of the external transverse heat absorption water tank 430, so that the top space and the bottom space of the internal rectangular cylinder 431 in the external rectangular cylinder 432 of the external transverse heat absorption water tank 430 are communicated, and the heating effect of high-temperature gas generated by combustion of the external transverse flue gas channel on water in the external transverse heat absorption water tank 430 can be improved.

The cooking hob 400 further has an inner transverse heat absorption water tank 450, the inner transverse heat absorption water tank 450 has a top wall plate 451 and a bottom wall plate 452, and the inner transverse heat absorption water tank 450 is communicated with the hearth inner ring heat absorption water tank 410. The space surrounded by the portion of the inner cylindrical wall plate of the furnace inner ring heat absorption water tank 410 located above the top wall plate 451 of the inner transverse heat absorption water tank 450 constitutes the lower furnace 412. The upper furnace 411 is communicated with the lower furnace 412.

The lower end of the exhaust pipe 433 is hermetically welded to an opening in the top wall of the inner rectangular cylinder 431, and the other end thereof protrudes upward from an opening in the top wall of the outer rectangular cylinder 432 and is hermetically welded to the opening.

Referring to fig. 3 to 7, the main burner 500 for combustible gas has a lower gas mixing housing 510, an intermediate support 520, an upper gas injection head 530, and a plurality of air/gas mixture conduits 550.

The gas mixing housing 510 has a partition 513 in the middle thereof to divide the gas mixing housing 510 into a lower housing portion 511 and an upper housing portion 512. The lower housing portion 511 has a lower closure plate 514 at its lower end. The upper housing portion 512 has an upper closure plate 519 at its upper end. A plurality of air guide pipes 515 inclined from the inside to the outside and from the left to the right are hermetically welded to a plurality of through holes of the lower closing plate 514, the centers of which are on the same circle. The partition 513 has a central through hole 516. An air inlet stub 517 is provided below the lower closure plate 514 of the lower housing portion 511. The lower housing part 511 has a gas inlet stub 518 in its circumferential wall.

The intermediate support 520 is in the shape of a stepped channel having a bottom wall 521, a lower peripheral wall 522, a central annular support wall 523 and an upper peripheral wall 524. The upper end of the lower peripheral wall plate 522 is slightly higher than the upper surface of the central annular support wall plate 523.

The upper showerhead 530 has an annular closure plate 531, a generally conical guide sleeve 532, and a cylindrical gas injection sleeve 533. The upper portion of the cylindrical air-jet sleeve 533 is provided with a plurality of small circular through holes 534. The cylindrical gas jet shroud 533 is formed with a plurality of vertical narrow openings 535 at its lower middle portion.

Referring to fig. 8 to 13, the normally open fire unit 600 has a windshield 601, an air supply duct 602, and a pair of striking assemblies 603. As shown in fig. 9 and 12, the windshield 601 has a rectangular left portion and a semicircular right portion. As shown in fig. 10 and 11, the windshield 601 is a housing whose left end is open. As shown in fig. 10 and 11, the gas supply pipe 602 is closed at the top and has a through hole 604 in the sidewall of the top. As shown in fig. 11, each of the striking assemblies 603 has a metal conduit 605, a refractory ceramic sleeve 606, and a refractory metal needle 607. The refractory ceramic bushing 606 is inserted into the metal conduit 605 from the top end of the metal conduit 605, with the top exposed at the top end of the refractory ceramic bushing 606. The high temperature resistant metal needle 607 is located in the central hole of the high temperature resistant ceramic bushing 606, the upper part of the needle is bent and extends out of the notch at the top end of the high temperature resistant ceramic bushing 606, the lower part of the needle is connected with a lead, and the lead (not shown) is communicated with an electric control switch (not shown). As shown in fig. 10 and 11, the gas supply pipe 602 and the metal conduits 605 of the two firing assemblies 603 sealingly pass through the floor of the housing of the draft shield 601 with their upper ends located within the housing of the draft shield 601. As shown in fig. 12 and 13, the gas supply pipe 602 is located on the right side of the two ignition modules 603, and the center of the gas supply pipe 602 is located on the center line of symmetry of the two ignition modules 603.

Referring to fig. 1 and 2, the main burner 500 of combustible gas is fixedly installed in the burner body 400 by hermetically welding a middle circular ring-shaped supporting wall plate 523 of the middle support 520 of the main burner 500 and an upper closing plate 519 of the upper end of the upper housing part 512 to the hole wall of the central hole of the top wall plate 451 and the hole wall of the central hole of the bottom wall plate 452 of the inner transverse heat absorption water tank 450 of the burner body 400, respectively. The air supply pipe 602 of the normally open fire unit 600 and the two metal pipes 605 of the pair of ignition assemblies 603 are hermetically welded to the hole wall of the corresponding hole of the top wall plate 451 and the hole wall of the corresponding hole of the bottom wall plate 452 of the internal transverse heat absorption water tank 450 of the burner body 400, respectively, so that the normally open fire unit 600 is fixedly installed in the burner body 400. The normally open fire unit 600 is located at the periphery of the main combustible gas burner 500, and the lower surface of the bottom plate of the housing of the windshield 601 of the normally open fire unit 600 is slightly higher than the upper surface of the annular closing plate 531 of the upper gas nozzle 530 of the main combustible gas burner 500.

The operation of the gas range 1000 will be described in detail with reference to the accompanying drawings:

referring to fig. 1, combustible gas is delivered to an air supply pipe 602, and the combustible gas flows out from a through hole 604 on the side wall of the top of the air supply pipe 602, enters the shell of the windshield 601, and is mixed with air in the shell of the windshield 601; a manual electric control switch, which applies high voltage to the two high temperature resistant metal needles 607 of the two ignition components 603 to generate electric sparks, and the mixed gas of the air and the combustible gas in the housing of the windshield 601 is ignited to form normally open flame, and the normally open flame is combusted from the opening at the left end of the housing of the windshield 601 to the center of the combustible gas main burner 500; simultaneously, air and combustible gas are conveyed to the air inlet short pipe 517 and the gas inlet short pipe 518, the air and the combustible gas are mixed in the lower shell part 511 to form main combustion gas, then the main combustion gas enters the upper shell part 512 through a central through hole 516 on the partition 513, then enters a space between the conical guide sleeve 532 and the cylindrical gas spraying sleeve 533 through a plurality of air-gas mixed gas guide pipes 550, then enters the space surrounded by the cylindrical gas spraying sleeve 533 through a plurality of small circular through holes 534 and a plurality of vertical narrow openings 535 on the cylindrical gas spraying sleeve 533, the main combustion gas rises, and is ignited by flame of normally open fire to form main combustion. A pan (not shown) is supported on top of the outer periphery of the furnace heat absorption water tank 420 to substantially seal the space of the upper furnace 411. The high temperature flue gas generated by the main combustion can be used for heating the pot for cooking on one hand, and on the other hand, under the condition that the space of the upper hearth 411 is basically sealed by the pot, the high temperature flue gas fills the space of the upper hearth 411 and the space of the lower hearth 412 to heat the water in the heat absorption water tank 410 at the inner ring of the hearth, the heat absorption water tank 420 at the outer ring of the hearth and the water in the internal transverse heat absorption water tank 450, then the high temperature flue gas enters the internal annular flue gas channel 421 through the four through holes 414, then enters the space surrounded by the internal rectangular cylinder 431 as the transverse flue gas channel to heat the water in the external transverse heat absorption water tank 430, and finally is discharged out of the stove body 400 through the smoke discharge.

The normally open fire unit 600 used by the gas stove 1000 has the advantages that under the condition that the amount of combustible gas conveyed to the gas supply pipe 602 is unstable, particularly under the condition that the combustible gas exceeds the reasonable amount, the combustible gas is insufficiently combusted, the generated carbon monoxide is discharged into the environment and is harmful to health, and the normally open fire is strong and weak in flame, so that the main combustion is influenced to be ignited at any time; the left end of the housing of the windshield 601 of the normally open flame unit 600 for the gas stove 1000 is open, and when the normally open flame is combusted from the opening at the left end of the housing of the windshield 601 to the center of the main burner 500, the normally open flame is easily influenced by external air flow, and the normally open flame is not concentrated and is scattered in time, so that the influence is exerted on the main combustion to ignite at any time.

Disclosure of Invention

The invention provides a normally open fire device and a gas stove thereof, aiming at solving the technical problems that the existing normally open fire unit for the gas stove has insufficient combustion of combustible gas, the generated carbon monoxide is harmful to health, the flame of the normally open fire is unstable, and the ignition of main combustion at any time is influenced.

The invention discloses a normally open fire device which is characterized by comprising a housing, a supporting plate, a first air supply pipe, a second air supply pipe and a pair of ignition components, wherein the housing is provided with a first air supply pipe and a second air supply pipe; the bottom end of the housing is open, a spray pipe is communicated with the side wall of the housing, each ignition assembly is provided with a guide pipe, the upper ends of the first air supply pipe, the second air supply pipe and the guide pipes of the pair of ignition assemblies are hermetically connected to the hole wall of the corresponding through hole of the support plate, the housing covers the support plate, and the ignition needles of the pair of ignition assemblies are positioned in the housing.

According to the normally open fire device, the housing and the support plate jointly define a basically closed space, mixed gas of air and combustible gas conveyed through the first air supply pipe is combusted in the space, the normally open fire device is not affected by any external environment, and flame is stable; because the air is supplemented into the basically closed space through the second air supply pipe, the combustible gas in the normal open fire is combusted secondarily, and the generation of carbon monoxide is completely avoided; because the normally open flame is sprayed to the main burner of the gas stove through the spray pipe, the concentration of the normally open flame sprayed into the main burner is high, powerful and powerful, and the main combustion gas can be ignited at any time to form main combustion.

The invention relates to a gas stove, which is provided with a main burner and a normally open fire device and is characterized in that the normally open fire device comprises a cover shell, a supporting plate, a first air supply pipe, a second air supply pipe and a pair of ignition components; the bottom end of the housing is open, a spray pipe is communicated with the side wall of the housing, each ignition assembly is provided with a guide pipe, the upper ends of the first air supply pipe, the second air supply pipe and the guide pipes of the pair of ignition assemblies are hermetically connected to the hole wall of the corresponding through hole of the supporting plate, the housing covers the supporting plate, the ignition needles of the pair of ignition assemblies are positioned in the housing, and the normally open ignition device is arranged at the periphery of the main burner.

The invention relates to a gas stove, which is provided with a main burner and a normally open fire device and is characterized in that the normally open fire device comprises a cover shell, a supporting plate, a first air supply pipe, a second air supply pipe and a pair of ignition components; the bottom end of the housing is open, a spray pipe is communicated with the side wall of the housing, each ignition assembly is provided with a guide pipe, the upper ends of the first air supply pipe, the second air supply pipe and the guide pipes of the pair of ignition assemblies are hermetically connected to the hole wall of the corresponding through hole of the supporting plate, the housing covers the supporting plate, the ignition needles of the pair of ignition assemblies are positioned in the housing, and the normally open ignition device is arranged at the periphery of the main burner; the burner is also provided with an auxiliary burner, the auxiliary burner is provided with a burning head and an air supply pipe, the burning head is provided with a central blind hole and a plurality of radial through holes, the radial through holes are communicated with the central blind hole, and the upper end of the air supply pipe extends into the central blind hole; the secondary burner is disposed within the primary burner.

Drawings

Fig. 1 is a longitudinal sectional view of an existing gas cooking stove;

FIG. 2 is a top schematic view of the gas stove of FIG. 1;

FIG. 3 is a longitudinal cross-sectional view of a main burner for combustible gas in the gas stove of FIG. 1;

FIG. 4 is a schematic cross-sectional view taken along line J-J of FIG. 3;

FIG. 5 is a schematic cross-sectional view taken along line K-K in FIG. 3;

FIG. 6 is a schematic cross-sectional view taken along line L-L of FIG. 3;

FIG. 7 is a schematic cross-sectional view taken along line M-M of FIG. 3;

FIG. 8 is a front schematic view of a normally open fire unit in the gas stove of FIG. 1;

FIG. 9 is a schematic top view of the normally open fire unit of FIG. 8;

FIG. 10 is a schematic cross-sectional view taken along line A-A of FIG. 9;

FIG. 11 is a schematic cross-sectional view taken along line B-B of FIG. 9;

FIG. 12 is a schematic cross-sectional view taken along line C-C of FIG. 10;

FIG. 13 is a schematic cross-sectional view taken along line D-D of FIG. 10;

FIG. 14 is a schematic front view of a normally open flame apparatus of the invention;

FIG. 15 is a schematic top view of the normally open flame apparatus of FIG. 14;

FIG. 16 is a schematic cross-sectional view taken along line E-E of FIG. 15;

FIG. 17 is a cross-sectional view taken along line F-F of FIG. 15;

FIG. 18 is a schematic cross-sectional view taken along line G-G of FIG. 17;

FIG. 19 is a schematic cross-sectional view taken along line H-H of FIG. 17;

FIG. 20 is a schematic longitudinal section of a secondary combustible gas burner of the invention;

fig. 21 is a longitudinal sectional view of a gas range having the normally open flame device of the present invention shown in fig. 14;

fig. 22 is a longitudinal sectional view schematically showing a gas range having the normally open flame device of the present invention shown in fig. 14 and the sub-burner of combustible gas of the present invention shown in fig. 20.

Detailed Description

The features and advantages of the normally open flame device and the gas range of the present invention will become more apparent from the following detailed description of the embodiments of the normally open flame device and the gas range thereof, which are described in conjunction with the accompanying drawings.

The normally open flame device 100 of the present invention is shown in fig. 14 to 19, and has a cylindrical housing 101, a circular support plate 130, a first air supply pipe 102, a second air supply pipe 120, and a pair of ignition modules 103. As shown in fig. 15 and 16, the bottom end of the cylindrical casing 101 is open, and a radial nozzle 110 is connected to the cylindrical wall thereof. As shown in fig. 17 to 19, each of the striking assemblies 103 has a metal conduit 105, a high temperature resistant ceramic sleeve 106 and a high temperature resistant metal needle 107. The refractory ceramic bushing 106 is inserted into the metal guide tube 105 from the top end of the metal guide tube 105, and the top is exposed from the top end of the refractory ceramic bushing 106. The high temperature resistant metal needle 107 is located in the central hole of the high temperature resistant ceramic sleeve 106, the upper part of the high temperature resistant metal needle bends and extends out of the notch at the top end of the high temperature resistant ceramic sleeve 106, the lower part of the high temperature resistant metal needle is connected with a lead (not shown), and the lead is communicated with an electric control switch (not shown). As shown in fig. 16 and 17, the upper ends of the first gas supply pipe 102, the second gas supply pipe 120 and the metal conduits 105 of the two ignition modules 103 are hermetically welded to the hole walls of the corresponding through holes of the circular support plate 130. As shown in fig. 18 and 19, the first air supply pipe 102 and the second air supply pipe 120 are respectively located on the left side and the right side of the two ignition modules 103, and the centers of the first air supply pipe 102 and the second air supply pipe 120 are located on the symmetrical center lines of the two ignition modules 103. The cylindrical housing 101 is covered over the circular support plate 130.

The gas range 200 of the present invention is shown in fig. 20 and has a cylindrical burner head 201 and an L-shaped gas supply pipe 202. The cylindrical burner head 201 has a central blind bore 204 and a plurality of radial through holes 205, the plurality of radial through holes 205 communicating with the central blind bore 204. The upper end of the L-shaped gas supply tube 202 can extend into the central blind bore 204 of the cylindrical burner head 201.

Referring to fig. 21, the normally open fire device 100 of the present invention shown in fig. 14 is used to replace the normally open fire unit 600 shown in fig. 8 in the gas range 1000 of the current use shown in fig. 1, resulting in the gas range 2000 of the present invention shown in fig. 21.

In the gas cooking stove 2000 of the present invention shown in fig. 21, the first air supply pipe 102, the second air supply pipe 120 and the two metal guide pipes 105 of the two ignition assemblies 103 of the normally open flame device 100 are hermetically welded to the hole wall of the corresponding hole of the top wall plate 451 and the hole wall of the corresponding hole of the bottom wall plate 452 of the inner transverse heat absorption water tank 450 of the burner body 400, respectively, so that the normally open flame device 100 is fixedly installed in the burner body 400. The normally open flame device 100 is located at the periphery of the main combustible gas burner 500, and the nozzle 110 of the normally open flame device 100 extends into a radial through hole of the circular closing plate 531 of the upper nozzle 530 of the main combustible gas burner 500.

Supplying a mixed gas of air and a combustible gas into the first gas supply pipe 102, the mixed gas of air and combustible gas entering the cylindrical casing 101; a manual electric control switch, which applies high voltage to the two high temperature resistant metal needles 107 of the two ignition components 103 to generate electric sparks, ignites the mixed gas of air and combustible gas in the cylindrical housing 101 to form a normally open fire, and simultaneously supplements air into the cylindrical housing 101 through the second air supply pipe 120 to perform secondary combustion on the combustible gas in the normally open fire, so that the flame of the normally open fire is sprayed to the center of the cylindrical air spray sleeve 533 through the radial spray pipe 110 on the cylindrical housing 101; simultaneously, air and combustible gas are conveyed to the air inlet short pipe 517 and the gas inlet short pipe 518, the air and the combustible gas are mixed in the lower shell part 511 to form main combustion gas, then the main combustion gas enters the upper shell part 512 through a central through hole 516 on the partition plate 513, then enters a space between the conical guide sleeve 532 and the cylindrical gas spraying sleeve 533 through a plurality of air-gas mixed gas guide pipes 550, then enters a space surrounded by the cylindrical gas spraying sleeve 533 through a plurality of small circular through holes 534 and a plurality of vertical narrow openings 535 on the cylindrical gas spraying sleeve 533, the main combustion gas rises, and is ignited by normal open flame to form main combustion.

The normally open fire device 100 of the present invention, since the cylindrical housing 101 and the circular support plate 130 together define a substantially closed space in which the mixed gas of air and combustible gas is burned, is not affected by any external environment, and the flame of the normally open fire is stable; because air is continuously supplemented into the basically closed space, the combustible gas in the normally open fire is combusted secondarily, and the generation of carbon monoxide is completely avoided; because the normally open flame is sprayed to the center of the cylindrical air injection sleeve 533 through the radial nozzle 110, the normally open flame sprayed into the cylindrical air injection sleeve 533 has high concentration and is powerful and powerful, and the main combustion gas can be ignited at any time to form main combustion.

Referring to fig. 22, a combustible gas sub-burner 200 of the invention shown in fig. 20 is added to the gas range 2000 of the invention shown in fig. 21 to obtain a gas range 3000 of the invention shown in fig. 22.

In the gas stove 3000 of the present invention shown in fig. 22, the vertical portion of the L-shaped gas supply pipe 202 of the sub-burner 200 is hermetically welded to the hole wall of the corresponding hole of the top wall plate 451 and the hole wall of the corresponding hole of the bottom wall plate 452 of the internal transverse heat absorption water tank 450 of the burner body 400, respectively, and the horizontal portion of the L-shaped gas supply pipe 202 is hermetically welded to the hole wall of the corresponding hole of the lower housing portion 511 of the main burner 500 for combustible gas, thereby fixedly mounting the sub-burner 200 in the burner body 400.

The mixed gas of air and combustible gas is delivered to the L-shaped air supply pipe 202, enters the central blind hole 204 of the cylindrical combustion head 201 and is then sprayed to the center of the cylindrical gas spraying sleeve 533 through the plurality of radial through holes 205, and the mixed gas of air and combustible gas rises and is ignited by flame of normal open fire to form auxiliary combustion.

When the main combustion that generates the strong combustion is not required, the sub combustion that generates the normal combustion may be used as an option.

Claims

1. A constant open flame device, characterized in that it comprises a cover, a support plate, a first gas supply pipe, a second gas supply pipe and a pair of ignition assemblies; the bottom end of the cover is open, and the side is open. A nozzle is communicated with the wall, and each ignition assembly has a conduit, and the upper ends of the first air supply pipe, the second air supply pipe and the conduits of the pair of ignition assemblies are sealingly connected to the corresponding through holes of the support plate. On the hole wall, the cover is covered on the support plate, and the spark pins of the pair of spark assemblies are located in the cover.

2. A gas stove with a main burner and a constant open flame device, characterized in that the constant open flame device comprises a cover, a support plate, a first gas supply pipe, a second gas supply pipe and a pair of bellows. Fire assembly; the bottom end of the casing is open, a nozzle is communicated on the side wall, each ignition assembly has a conduit, the first air supply pipe, the second air supply pipe and the conduits of the pair of ignition assemblies The upper end of the fuse is sealingly connected to the hole wall of the corresponding through hole of the support plate, the cover is covered on the support plate, the spark needles of the pair of ignition assemblies are located in the cover, and the normally open flame device is arranged in the cover The periphery of the main burner.

3. A gas stove with a main burner and a constant-fire device, characterized in that the constant-fire device includes a cover, a support plate, a first gas supply pipe, a second gas supply pipe, and a pair of heaters. Fire assembly; the bottom end of the casing is open, a nozzle is communicated on the side wall, each ignition assembly has a conduit, the first air supply pipe, the second air supply pipe and the conduits of the pair of ignition assemblies The upper end of the fuse is sealingly connected to the hole wall of the corresponding through hole of the support plate, the cover is covered on the support plate, the spark needles of the pair of ignition assemblies are located in the cover, and the normally open flame device is arranged in the cover The periphery of the main burner; also has an auxiliary burner, the auxiliary burner has a combustion head and an air supply pipe, the combustion head has a central blind hole and a plurality of radial through holes, the plurality of radial through holes and the The central blind hole is communicated, and the upper end of the air supply pipe extends into the central blind hole; the auxiliary burner is arranged in the main burner.