CN211781089U - Combustor with anti-backfire function - Google Patents

Abstract

The utility model relates to a combustor technical field, more specifically relates to a combustor with anti-backfire function. A combustor with an anti-backfire function comprises a shell and at least one fire grate arranged in the shell, wherein the fire grate and the shell form a combustor device, an air injection pipe assembly used for conveying gas is arranged below the air inlet end of the fire grate, a gas valve is arranged at the air inlet of the air injection pipe assembly, the combustor device further comprises a blowable backfire protection device penetrating through an upper through hole of the fire grate, and the backfire protection device is electrically connected with a controller used for controlling the gas valve to supply gas to the combustor device. The utility model discloses in, when the backfire appears in the combustor device, the fire bank temperature risees, and the fire bank of high temperature makes the backfire protection device fuse of installing on the fire bank, and controller control gas valve closes, and the controller cuts off the gas valve and provides the gas to the combustor device to can protect the combustor effectively when the combustor device appears backfire.

Description

Combustor with anti-backfire function

Technical Field

The utility model relates to a combustor technical field, more specifically relates to a combustor with anti-backfire function.

Background

Due to the needs of energy conservation and emission reduction, people pay attention to the emission of harmful flue gas of a combustor and pay attention to the reduction of the emission of nitrogen oxides harmful to human bodies and the environment. Through analysis, the smoke discharged by the burner of the gas water heater contains nitrogen oxides, the mainstream technology in the market is the technology of completely mixing the gas and sufficient air through a fan, the completely premixed gas is completely combusted on the surface of a fire hole plate of the burner, the high-temperature area during combustion is reduced, and the generation of the nitrogen oxides is reduced. Because the full premixed gas is close to the surface of the fire hole plate of the burner to burn, the temperature of the burner is continuously increased, and when the temperature is higher than the ignition point of the premixed gas, tempering can occur. To prevent the occurrence of flashback, a need exists for a flashback resistant burner. In addition, due to the defects of the structure of the combustor, the combustor has the problems of small load regulation ratio and poor user experience.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome the problem that the tempering appears in the combustor among the above-mentioned prior art, increase water heater combustion assembly's load regulation ratio promotes user experience's travelling comfort, provides a combustor with anti-backfire function.

In order to solve the technical problem, the utility model discloses a technical scheme is: a combustor with an anti-backfire function comprises a shell and at least one fire grate arranged in the shell, wherein the fire grate and the shell form a combustor device, an air injection pipe assembly used for conveying gas is arranged below the air inlet end of the fire grate, a gas valve is arranged at the air inlet of the air injection pipe assembly, the combustor device further comprises a blowable backfire protection device penetrating through an upper through hole of the fire grate, and the backfire protection device is electrically connected with a controller used for controlling the gas valve to supply gas to the combustor device.

In this technical scheme, when the burner device appears tempering, the fire row temperature risees, and the fire row of high temperature makes the backfire protection device who installs on the fire row fuse, and controller control gas valve closes, and the controller cuts off the gas valve and provides the gas to the burner device to can protect the burner effectively when the burner device appears tempering.

Preferably, both ends of the backfire protection device are connected into the controller, and the controller is electrically connected with the gas valve. After the backfire protection device is fused, the controller receives a signal that the backfire protection device is fused, the controller closes the gas valve, and the gas valve stops supplying gas to the gas ejector pipe assembly, so that the burner device is prevented from being damaged when backfire occurs.

Preferably, the controller, the flashback protection device, and the gas valve are connected in series. In the technical scheme, after the backfire protection device is fused, the circuits among the controller, the backfire protection device and the gas valve are cut off, the power supply of the controller to the gas valve is interrupted, the gas valve is closed, the gas valve does not provide gas for the gas injection pipe assembly any more, and the burner device is prevented from being damaged when backfire occurs.

Preferably, a cooling water pipe is arranged on the fire grate. In this technical scheme, can make fire row and condenser tube integrated into one piece through processes such as expand tube, the heat of combustor device can transmit to condenser tube on, the cold water that flows through in the condenser tube takes away the heat to reach the temperature that reduces the combustor device, avoid the appearance of tempering.

Preferably, the air inlet end that the fire was arranged with be provided with the deep bead between the jet-propelled pipe assembly, be provided with a plurality of first through-hole structures on the deep bead, first through-hole structure corresponds with the inlet end that fumarole, fire were arranged on the jet-propelled pipe assembly. In this technical scheme, when need control combustor primary air input, can change the deep bead in the combustor installation, it is mainly through changing the first through-hole structure of different diameter sizes on the deep bead to reach the purpose of control air input. It should be noted that the fumaroles on the fumarole assembly, the first through hole structure on the wind shield and the air inlet end of the fire row correspond to each other, so that the air and the fuel gas are fully mixed and then enter the fire row from the air inlet end of the fire row.

Preferably, the fumarole assembly includes sprue and two at least branch runners, branch runner along the axial of sprue set gradually and with the sprue intercommunication, be equipped with on the sprue make branch runner with the reposition of redundant personnel controlling means of sprue part intercommunication, the sprue is located to the air inlet one and serves, the fumarole is located each branch runner. Therefore, at least part of the branch runners can be controlled to be selectively communicated with the main runner through the flow dividing control device, that is, all the branch runners can be completely communicated with the main runner, or a part of the branch runners can be communicated with the main runner, and the number of the branch runners communicated with the main runner can be selected according to requirements; therefore, total sectional air injection of the whole air injection pipe can be realized, sectional combined combustion can be realized by matching with a combustor, the load regulation ratio of a combustion assembly of the water heater can be effectively increased, and the comfort of user experience is improved.

Preferably, the main runner penetrates through the branch runners, and the flow distribution control device comprises a segmenting structure arranged in the main runner between two adjacent branch runners and a segmenting device, wherein one end of the segmenting device is inserted into the main runner and matched with the segmenting structure, so that the main runners on two sides of the segmenting structure can be selectively communicated or closed. When the gas in the main runner flows in the direction, the subsection structure on the inner wall of the main runner between two adjacent branch runners is matched with the subsection device to close the main runners on two sides of the subsection structure, and the subsection structure between the two adjacent branch runners and the gas inlet is in a separated state from the corresponding subsection device, the gas inlet is communicated with the main runner, so that the gas always exists in the main runner between the two adjacent branch runners and the gas inlet, at the moment, in the two adjacent branch runners, the gas in the main runner can enter the branch runners close to the gas inlet, and the main runners on two sides of the subsection structure are closed due to the matching of the subsection structure between the two adjacent branch runners and the subsection device, so that the gas in the main runner cannot enter the other branch runner in the two adjacent branch runners.

Preferably, the segmenting device is including establishing conversion seat on the port of sprue one end, wear to locate conversion seat and stretch into the change shaft in the sprue, the segmentation structure is for locating first annular flange on the sprue inner wall, be equipped with on the circumference lateral wall of the inside change shaft of sprue can with the inconsistent tight fit's of segmentation structure second annular flange, be equipped with first sealing washer on the second annular flange, be equipped with on conversion seat and the change shaft and be used for controlling each segmentation structure and second annular flange and follow the sprue internal combustion gas flow direction is offset tight fit or the controlling means who separates in proper order, the one end that is close to the conversion seat is located to the air inlet. In the technical scheme, the control device controls the conversion shaft to move in the main flow channel, so that the abutting fit or separation of each group of segmental structures and the second annular flange can be realized, the aim of sequentially opening and closing each branch flow channel along the flowing direction of gas in the main flow channel is further fulfilled, and the aim of segmental combustion of the gas ejector pipe is finally realized. First sealing washer can guarantee that first annular flange has good leakproofness with second annular flange when supporting the tight fit.

Preferably, the housing comprises a first bracket, a second bracket, a first burner plate and a second burner plate which are detachably connected, and the first burner plate and the second burner plate are arranged between the first bracket and the second bracket; the first support with be provided with on the second support run through in the draw bar structure of fire row, the draw bar structure includes threaded rod and nut structure. In this technical scheme, the threaded rod runs through on locating first support, fire row and second support, then strains and locks through the nut structure, is favorable to convenient installation and the dismantlement of casing.

Preferably, the first support and the second support are provided with a gear structure formed by a plurality of second through hole structures, the gas ejector pipe assembly is provided with a screw hole, and the gear structure is in threaded connection with the screw hole. In this technical scheme, the fender position structure that a plurality of second through-hole structures formed and the screw threaded connection on the jet-propelled pipe assembly can realize installing the jet-propelled pipe assembly on keeping off the position structure's different second through-hole structures to can be when the combustor of jet-propelled gas kind or adaptation different liter numbers is changed to needs, through the mounted position of transform jet-propelled pipe assembly and the second through-hole structure who keeps off the position structure, thereby adapt to the burning of combustor. In addition, the distance between the gas injection hole and the fire grate on the gas injection pipe assembly can be controlled through the connection of the gas injection pipe assembly and different second through hole structures of the gear structures.

Compared with the prior art, the beneficial effects are:

in the utility model, by arranging the backfire protection device which penetrates through the fire grate, when the temperature of the fire grate is overhigh, the backfire protection device is fused, the controller controls the gas valve to be closed, and the burner is protected; when the type of the jet gas needs to be changed or the burner with different lifting numbers needs to be adapted, the connection relation between the jet pipe assembly and the second through hole structure on the gear structure is adjusted, so that the combustion of the combustion chamber can be adapted; the distance between the jet orifice on the jet pipe assembly and the fire grate can be adjusted by adjusting the connection relationship between the jet pipe assembly and the second through hole structure on the gear structure; the air inlet amount of primary air of the burner can be controlled by replacing the air baffle in the mounting process of the burner; the jet-propelled pipe assembly adopts the design of sprue and branch runner, can realize that the segmentation of whole jet-propelled pipe assembly spouts the gas, uses with the cooperation of combustor device and can realize the segmentation combination burning, can effectively increase water heater combustion assembly's load regulation ratio, promotes user experience's travelling comfort.

Drawings

Fig. 1 is a perspective view of the burner of the present invention;

fig. 2 is a perspective view of the burner of the present invention without the second bracket;

FIG. 3 is a partial view of the burner of the present invention;

FIG. 4 is a circuit control diagram of the burner of the present invention;

FIG. 5 is another circuit control diagram of the burner of the present invention;

FIG. 6 is a perspective view of the gas lance assembly of the present invention;

FIG. 7 is a longitudinal cross-sectional view of a main flow passage in the gas lance assembly of the present invention;

FIG. 8 is a longitudinal cross-sectional view of a transition seat in the gas lance assembly of the present invention;

fig. 9 is a longitudinal sectional view of the overall structure of the present invention with the segmented structure in abutting engagement with the second flange;

FIG. 10 is an enlarged view of a portion of FIG. 9 at A;

fig. 11 is a partial enlarged view at B in fig. 9;

fig. 12 is a longitudinal sectional view of the overall structure of the present invention when the segmented structure is separated from the second flange.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limiting the present patent, and those skilled in the art will understand the specific meaning of the terms according to their specific circumstances.

The technical solution of the present invention is further described in detail by the following specific embodiments in combination with the accompanying drawings:

example 1

As shown in fig. 1, 2, 4, 5, and 6, a burner with an anti-backfire function comprises a housing 1 and at least one fire grate 2 arranged in the housing 1, wherein the fire grate 2 and the housing 1 form a burner device, an air injection pipe assembly 3 for conveying gas is arranged below an air inlet end of the fire grate 2, a gas valve 4 is arranged at an air inlet 31 of the air injection pipe assembly 3, the burner device further comprises a fusible backfire protection device 5 penetrating through a through hole arranged on the fire grate 2, and the backfire protection device 5 is electrically connected with a controller 6 for controlling the gas valve 4 to supply gas to the burner device. When the burner device appears tempering, 2 temperature risees on the fire row, and 2 make the tempering protection device 5 fusing of installing on the fire row 2 on the fire row of high temperature fire row, and 6 control gas valves 4 of controller close, and 6 cut off gas valves 4 of controller provide the gas to the burner device to can protect the burner effectively when the burner device appears tempering. At least two groups of profiling structures 24 are arranged on the fire grate 2 at the outer side, and the profiling structures 24 form independent flow channels.

As shown in fig. 4, both ends of the backfire protection device 5 are connected into a controller 6, and the controller 6 is electrically connected with the gas valve 4. After the backfire protection device 5 is fused, the controller 6 receives a signal that the backfire protection device 5 is fused, the controller 6 closes the gas valve 4, and the gas valve 4 stops supplying gas to the gas ejector assembly 3, so that the burner device is prevented from being damaged when backfire occurs.

As shown in fig. 5, the controller 6, the flashback-preventing device 5, and the gas valve 4 are connected in series. After the backfire protection device 5 is fused, the circuit among the controller 6, the backfire protection device 5 and the gas valve 4 is cut off, the power supply of the controller 6 to the gas valve 4 is interrupted, the gas valve 4 is closed, the gas valve 4 does not provide gas for the gas ejector assembly 3 any more, and the burner device is prevented from being damaged when backfire occurs.

As shown in fig. 1 and 2, the fire grate 2 is provided with a cooling water pipe 7. In this embodiment, can make fire row 2 and condenser tube 7 integrated into one piece through processes such as expand tube, the heat of combustor device can transmit to condenser tube 7 on, the cold water that flows through in the condenser tube 7 takes away the heat to reach the temperature that reduces the combustor device, avoid the appearance of tempering.

In addition, a wind shield 8 is arranged between the air inlet end of the fire row 2 and the gas ejector assembly 3, a plurality of first through hole structures 81 are arranged on the wind shield 8, and the first through hole structures 81 correspond to the gas ejecting holes 34 on the gas ejector assembly 3 and the air inlet end of the fire row 2. When the primary air intake of the burner needs to be controlled, the wind shield 8 can be replaced in the mounting process of the burner, and the purpose of controlling the air intake is achieved mainly by replacing the first through hole structures 81 with different diameters on the wind shield 8. It should be noted that the gas injection holes 34 on the gas injection pipe assembly 3, the first through hole structure 81 on the wind shield 8 and the air inlet end of the fire row 2 correspond to each other, so that the air and the gas are fully mixed and then enter the fire row 2 from the air inlet end of the fire row 2.

As shown in fig. 6 and 7, the gas nozzle assembly 3 includes a main flow channel 32 and at least two branch flow channels 33, the branch flow channels 33 are sequentially disposed along an axial direction of the main flow channel 32 and are communicated with the main flow channel 32, a flow distribution control device is disposed on the main flow channel 32 to partially communicate the branch flow channels 33 with the main flow channel 32, the gas inlet 31 is disposed on one end of the main flow channel 32, and the gas nozzle 34 is disposed on each branch flow channel 33. Thus, at least part of the branch runners 33 can be controlled to be selectively communicated with the main runner 32 through the flow dividing control device, that is, all the branch runners 33 can be completely communicated with the main runner 32, or a part of the branch runners 33 can be communicated with the main runner 32, and the number of the branch runners 33 communicated with the main runner 32 can be selected according to requirements; therefore, 3 segmented air injection of the whole air injection pipe can be realized, segmented combined combustion can be realized by matching with a combustor, the load regulation ratio of a combustion assembly of the water heater can be effectively increased, and the comfort of user experience is improved.

In addition, as shown in fig. 6, 7 and 9, the main flow channel 32 penetrates through the branch flow channels 33, and the flow dividing control device includes a segment structure 9 disposed in the main flow channel 32 between two adjacent branch flow channels 33, and a segment device having one end inserted in the main flow channel 32 and cooperating with the segment structure 9 to enable the main flow channel 32 on both sides of the segment structure 9 to be selectively connected or closed. When the sectioning structure 9 on the inner wall of the main flow channel 32 between two adjacent branch flow channels 33 is matched with the sectioning device in the flowing direction of the fuel gas in the main flow channel 32, the main flow channel 32 at two sides of the sectioning structure 9 is closed, and the segmented structure 9 between the two adjacent branch flow channels 33 and the gas inlet 31 and the corresponding segmented device are in a separated state, because the gas inlet 31 is communicated with the main flow channel 32, the gas is always present in the main flow channel 32 between the two adjacent branch flow channels 33 and the gas inlet 31, and at this time, in the two adjacent branch channels 33, the gas in the main channel 32 can enter the branch channel 33 near the gas inlet 31, and the main flow channel 32 on both sides of the segment structure 9 is closed due to the cooperation of the segment structure 9 between the two adjacent branch flow channels 33 and the segment device, the gas in the main flow channel 32 cannot enter the other branch flow channel 33 of the two adjacent branch flow channels 33.

As shown in fig. 6 and 11, the segmenting device includes a converting seat 23 disposed at an end port of the main flow passage 32, and a converting shaft 10 penetrating through the converting seat 23 and extending into the main flow passage, the segmenting structure 9 is a first annular flange disposed on an inner wall of the main flow passage 32, a second annular flange 11 capable of being abutted against and tightly fitted with the segmenting structure 9 is disposed on a circumferential side wall of the converting shaft 10 inside the main flow passage 32, a first seal ring 25 is disposed on the second annular flange 11, a control device for controlling the sequential abutting against and tight fitting or separation of the segmenting structure 9 and the second annular flange 11 along a combustion flow direction in the main flow passage 32 is disposed on the converting seat 23 and the converting shaft 10, and the air inlet 31 is disposed at an end close to the converting seat 23. The control device controls the switching shaft 10 to move in the main flow passage 32, so that the component section structures 9 and the second annular flange 11 are in interference fit or separated, the aim of sequentially opening and closing the branch flow passages 33 along the gas flowing direction in the main flow passage 32 is further achieved, and the aim of sectionally combusting the gas ejector pipe is finally achieved. The first sealing ring 25 can ensure good sealing performance when the first annular flange is tightly matched with the second annular flange 11 in a propping mode.

It should be noted that, as shown in fig. 6, 8 and 10, the control device includes gear engaging grooves 19 corresponding to the number of the branch flow passages 33 and disposed on one side of the converting seat 23 near the outer portion of the main flow passage 32, engaging pins 20 disposed on the end of the converting shaft 10 extending out of the main flow passage 32 and engaged with the gear engaging grooves 19, and a spring 21 sleeved on the converting shaft 10 inside the main flow passage 32, one end of the spring 21 abuts against the converting seat 23, a blocking plate 22 is disposed on the converting shaft 10 at a position corresponding to the other end of the spring 21, and the other end of the spring 21 abuts against the blocking plate 22. When the bayonet 20 is clamped in the first gear clamping groove 19, the segmented structure 9 and the second annular flange 11 are in abutting tight fit, at the moment, the gas in the main runner 1 can only enter a first branch runner 33 close to the gas inlet 31, and the gas can only be sprayed out from the branch runner 33 close to the gas inlet 31; when the clamping pin 20 is clamped in the second retaining clamping groove 19, the segmented structure 9 and the second annular flange 11 are just separated, and the gas in the main flow passage 32 can enter all the branch flow passages 33, as shown in fig. 12; therefore, through the matching of the clamping grooves 19 of different gears and the clamping pins 20, whether the gas ejector tube assembly 3 burns in a segmented mode or not can be controlled.

In addition, as shown in fig. 1 and 3, the casing 1 includes a first bracket 12, a second bracket 13, a first burner plate 14 and a second burner plate 15, which are detachably connected, provided between the first bracket 12 and the second bracket 13; the first bracket 12 and the second bracket 13 are provided with a pull rod structure penetrating through the fire grate 2, and the pull rod structure comprises a threaded rod 16 and a nut structure 17. Threaded rod 16 runs through and locates first support 12, fire row 2 and second support 13 on, then strains and locks through nut structure 17, is favorable to convenient installation and the dismantlement of casing 1.

The first bracket 12 and the second bracket 13 are provided with a gear structure 18 formed by a plurality of second through hole structures, the gas nozzle assembly 3 is provided with a screw hole 35, and the gear structure 18 is in threaded connection with the screw hole 35. The gear structure 18 formed by the second through hole structures is in threaded connection with the screw hole 35 on the gas ejector assembly 3, so that the gas ejector assembly 3 can be installed on different second through hole structures of the gear structure 18, and the installation positions of the second through hole structures of the gas ejector assembly 3 and the gear structure 18 can be changed to adapt to the combustion of a combustor when the gas ejector type needs to be changed or the combustor with different upgrading numbers needs to be adapted. Furthermore, the distance between the gas nozzles 34 of the gas nozzle assembly 3 and the burner row 2 can be controlled by connecting the gas nozzle assembly 3 to a different second through-hole structure of the gear structure 18.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a combustor with anti-backfire function, includes casing (1) and locates at least one fire row (2) in casing (1), fire row (2) with casing (1) form the combustor device, the air inlet end below of fire row (2) is installed and is used for carrying gas jet-propelled pipe assembly (3), gas valve (4) are installed in air inlet (31) of air jet-propelled pipe assembly (3), its characterized in that: the gas burner is characterized by further comprising a fusible backfire protection device (5) penetrating through a through hole in the fire grate (2), wherein the backfire protection device (5) is electrically connected with a controller (6) used for controlling the gas valve (4) to supply gas to the burner device.

2. The burner with the function of preventing the backfire as claimed in claim 1, wherein: the two ends of the backfire protection device (5) are connected into the controller (6), and the controller (6) is electrically connected with the gas valve (4).

3. The burner with the function of preventing the backfire as claimed in claim 1, wherein: the backfire protection device (5) is connected with the gas valve (4) in series and then is connected into the controller (6).

4. A burner with an anti-backfire function as claimed in claim 2 or 3, wherein: and the fire grate (2) is provided with a cooling water pipe (7).

5. The burner with the function of preventing the backfire as claimed in claim 4, wherein: the gas inlet end of fire row (2) with be provided with deep bead (8) between fumarole assembly (3), be provided with a plurality of first through-hole structures (81) on deep bead (8), first through-hole structure (81) are corresponding with fumarole (34) on fumarole assembly (3), the gas inlet end of fire row (2).

6. The burner with the function of preventing the backfire as claimed in claim 5, wherein: jet-propelled pipe assembly (3) include sprue (32) and two at least runners (33), runner (33) are along the axial of sprue (32) sets gradually and with sprue (32) intercommunication, be equipped with on sprue (32) make runner (33) with the reposition of redundant personnel controlling means of sprue (32) part intercommunication, air inlet (31) are located on one end of sprue (32), fumarole (34) are located on each runner (33).

7. The burner with the function of preventing the backfire as claimed in claim 6, wherein: the main runner (32) run through in branch runner (33), the reposition of redundant personnel controlling means is including establishing segmentation structure (9) in the main runner between two adjacent branch runners (33) to and one end insert locate in main runner (32) and with segmentation structure (9) cooperate make the segmentation device that main runner (32) of segmentation structure (9) both sides can the selectivity communicate or close.

8. The burner with the function of preventing the backfire as claimed in claim 7, wherein: the segmenting device comprises a conversion seat (23) arranged on one end port of the main flow passage (32), a conversion shaft (10) which is arranged on the conversion seat (23) in a penetrating way and extends into the main flow passage (32), the segmented structure (9) is a first annular flange arranged on the inner wall of the main runner (32), a second annular flange (11) which can be abutted and tightly matched with the segmented structure (9) is arranged on the circumferential side wall of the switching shaft (10) in the main flow passage (32), the improved gas turbine is characterized in that a first sealing ring (25) is arranged on the second annular flange (11), a control device used for controlling each component section structure (9) to be sequentially abutted and tightly matched or separated with the second annular flange (11) along the flowing direction of gas in the main flow passage (32) is arranged on the conversion seat (23) and the conversion shaft (10), and the gas inlet (31) is arranged at one end close to the conversion seat (23).

9. The burner with the function of preventing the backfire as claimed in claim 1, wherein: the shell (1) comprises a first bracket (12), a second bracket (13), a first burner plate (14) and a second burner plate (15), wherein the first bracket (12) and the second bracket (13) are detachably connected; the first support (12) and the second support (13) are provided with pull rod structures penetrating through the fire grate (2), and each pull rod structure comprises a threaded rod (16) and a nut structure (17).

10. The burner with the function of preventing the backfire as claimed in claim 9, wherein: be provided with gear structure (18) that form by a plurality of second through-hole structures on first support (12), second support (13), be provided with screw (35) on jet-propelled pipe assembly (3), gear structure (18) with screw (35) threaded connection.

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