Combustor

Abstract

A combustor includes a housing and a combustion chamber assembly. The combustion cavity assembly comprises a cylinder part, a mounting base, a first spark plug, a second spark plug and a diesel nozzle assembly. The barrel part comprises a combustion cavity. The mounting base comprises an air inlet channel and a mounting cylinder part. The first sparking plug and the second sparking plug stretch into the combustion cavity in a protruding mode. The diesel oil nozzle assembly is installed on the installation barrel body part and used for spraying diesel oil into the combustion cavity. The diesel nozzle assembly comprises a valve needle, a first rotational flow assembly located at the bottom of the valve needle and a sleeve part located below the first rotational flow assembly, the first rotational flow assembly comprises an inlet hole and a closure spraying hole, and the sleeve part is provided with a mixing cavity communicating with the closure spraying hole. And the mixing cavity is used for mixing diesel oil and air. The closure spraying hole improves the continuity of spraying diesel oil at low power.

Description

Technical Field

[0001] The invention relates to a burner, belonging to the technical field of engine tail gas post-processing. Background Art

[0002] With the continuous upgrading of emission regulations, how to quickly increase the temperature of exhaust gas during cold start of the engine to shorten the time to reach the working temperature of the aftertreatment carrier and / or perform thermal management is a technical problem faced by technicians in the relevant technical field.

[0003] To this end, a solution of adding a burner to the exhaust gas after-treatment system has been proposed in the related art.

[0004] However, when the burner is in a low operating condition, the stability of diesel atomization is greatly challenged because the amount of diesel injected into the combustion chamber is small. Summary of the invention

[0005] The object of the present invention is to provide a burner with an improved structure.

[0006] To achieve the above object, the present invention adopts the following technical solution: a burner for use in a diesel engine exhaust treatment system, the burner comprising:

[0007] a housing, the housing comprising an inner cavity for allowing exhaust gas to flow; and

[0008] A combustion chamber assembly, the combustion chamber assembly is mounted on the housing, and the combustion chamber assembly comprises:

[0009] A barrel portion, the barrel portion comprising a circumferential wall and a combustion chamber surrounded by the circumferential wall, the combustion chamber being in communication with the inner cavity;

[0010] A mounting seat, the mounting seat is fixed to the barrel portion, the mounting seat comprises an air intake passage, a first wall portion, a second wall portion and a mounting barrel portion;

[0011] a first spark plug, the first spark plug being mounted on the first wall portion, the first spark plug protruding into the combustion chamber;

[0012] a second spark plug, the second spark plug being mounted on the second wall portion, the second spark plug protruding into the combustion chamber; and

[0013] A diesel nozzle assembly, the diesel nozzle assembly is mounted on the mounting cylinder portion, and the diesel nozzle assembly is used to spray diesel into the combustion chamber;

[0014] Wherein, the diesel nozzle assembly includes a valve needle, a first swirl assembly located at the bottom of the valve needle, and a sleeve portion at least partially located below the first swirl assembly, the first swirl assembly includes an inlet hole and a shut-off nozzle hole, the sleeve portion is provided with a mixing chamber connected to the shut-off nozzle hole, the mixing chamber is used for mixing diesel and air, and the mixing chamber is connected to the combustion chamber.

[0015] As a further improved technical solution of the present invention, the first swirl assembly includes a plurality of swirl plates to form a swirl channel; the inlet hole is arranged on the top swirl plate, and the intercepting spray hole is arranged on the bottom swirl plate.

[0016] As a further improved technical solution of the present invention, the combustion chamber assembly includes an annular airflow channel located between the mounting cylinder portion and the diesel nozzle assembly, the annular airflow channel is connected to the air intake channel, and the sleeve portion includes a first opening connecting the annular airflow channel and the mixing chamber.

[0017] As a further improved technical solution of the present invention, the diesel nozzle assembly further includes a second swirl assembly matched with the sleeve portion, and the second swirl assembly includes a second connecting port connecting the annular airflow channel and the combustion chamber.

[0018] As a further improved technical solution of the present invention, the sleeve portion includes a hollow cylindrical portion and a hollow conical portion connected to the cylindrical portion, the mixing chamber passes through the cylindrical portion and the conical portion, the second swirl component is located on the outside of the conical portion, a conical airflow channel is formed between the second swirl component and the conical portion, the second connecting port connects the annular airflow channel and the conical airflow channel, and the conical airflow channel is connected to the combustion chamber.

[0019] As a further improved technical solution of the present invention, the barrel portion and the mounting seat are both made of metal material, and the barrel portion and the mounting seat are separately provided and assembled and fixed together.

[0020] As a further improved technical solution of the present invention, the housing is provided with a raised mounting portion;

[0021] The mounting seat comprises a mounting plate and a mounting convex portion, the mounting plate is mounted and fixed to the mounting portion, the mounting convex portion and the mounting cylindrical portion are both integrally formed with the mounting plate, and the mounting convex portion and the mounting cylindrical portion both protrude from the mounting plate;

[0022] A first airflow purge channel is also provided between the first spark plug and the first wall portion, and the mounting convex portion is provided with a first air hole connecting the air intake channel and the first airflow purge channel, so as to use a part of the air to purge the first spark plug.

[0023] As a further improved technical solution of the present invention, a second air flow purge channel is also provided between the second spark plug and the second wall portion, and the mounting convex portion is provided with a second air hole connecting the air intake channel and the second air flow purge channel to utilize a portion of the air to purge the second spark plug.

[0024] As a further improved technical solution of the present invention, the first airflow purge channel and the second airflow purge channel are both annular and both pass through the mounting plate.

[0025] As a further improved technical solution of the present invention, the shell is further provided with a raised portion protruding in the direction of the mounting portion, and the raised portion is used to guide part of the exhaust gas to the combustion chamber assembly.

[0026] Compared with the prior art, the burner of the present invention has a first swirl component, which includes an inlet hole and a cut-off nozzle hole. The cut-off nozzle hole improves the continuity of diesel injection under low power, and the accuracy of fuel injection metering can be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a three-dimensional schematic diagram of a burner of the present invention in one embodiment;

[0028] Figure 2 yes Figure 1 Left view of;

[0029] Figure 3 yes Figure 1 The main view of

[0030] Figure 4 is along Figure 2 Schematic diagram of the cross section along the AA line;

[0031] Figure 5 is along Figure 2 Schematic diagram of the cross section of the middle BB line;

[0032] Figure 6 is along Figure 1 Schematic diagram of the cross section along the CC line;

[0033] Figure 7 is a three-dimensional schematic diagram of a combustion chamber assembly of a burner of the present invention;

[0034] Figure 8 yes Figure 7The main view of

[0035] Fig. 9 is along Figure 8 Schematic diagram of the cross section of the middle DD line;

[0036] Fig.10 yes Fig. 9 A partial enlarged view of the circled portion E;

[0037] Fig.11 is along Figure 3 Schematic cross-section of the FF line;

[0038] Fig.12 It is a schematic diagram of a detection circuit for detecting whether a burner is ignited successfully according to the present invention. DETAILED DESCRIPTION

[0039] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, where if there are several specific embodiments, the features of these embodiments can be combined with each other without conflict. When the description refers to the drawings, unless otherwise specified, the same numbers or symbols in different drawings represent the same or similar elements. The contents described in the following exemplary specific embodiments do not represent all embodiments of the present invention. On the contrary, they are only examples of products consistent with the present invention as recorded in the claims of the present invention.

[0040] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention. It should be understood that the words "first", "second" and the like used in the specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish the names of features.

[0041] Please refer to Figures 1 to 10 As shown, the present invention discloses a burner 100, which is used in a diesel engine exhaust aftertreatment system to quickly increase the temperature of the exhaust gas and / or perform thermal management. A person skilled in the art will understand that, in one embodiment, the diesel engine exhaust aftertreatment system includes a diesel oxidation catalyst (DOC), a diesel particulate filter (DPF) and a selective catalytic reducer (SCR). The burner includes a housing 1 and a combustion chamber assembly 2 mounted on the housing 1.

[0042] In one embodiment of the present invention, the housing 1 is made of a metal material, and includes a first half housing 11, a second half housing 12, a first flange 13 fixed to one end of the first half housing 11 and the second half housing 12, and a second flange 14 fixed to the other end of the first half housing 11 and the second half housing 12. The burner 100 can be detachably connected to the diesel engine exhaust after-treatment system through the first flange 13 and the second flange 14.

[0043] The shell 1 is provided with an inner cavity 10 to allow exhaust gas to flow through. In the illustrated embodiment of the present invention, the inner cavity 10 is formed by the first half shell 11 and the second half shell 12. Of course, those skilled in the art will understand that in other embodiments of the present invention, the shell 1 may also be an integrated shell. In one embodiment of the present invention, the first half shell 11 and the second half shell 12 are welded and fixed. The first flange 13 is welded and fixed to one end of the first half shell 11 and the second half shell 12, and the second flange 14 is welded and fixed to the other end of the first half shell 11 and the second half shell 12.

[0044] In addition, in the illustrated embodiment of the present invention, the housing 1 is provided with a raised mounting portion 15 , and the axis of the mounting portion 15 forms an angle less than 90° (eg, an angle of 45°) with the axis of the inner cavity 10 .

[0045] The combustion chamber assembly 2 is mounted on the mounting portion 15 and at least partially protrudes into the inner cavity 10. In addition, the housing 1 is further provided with a raised portion 16 protruding toward the mounting portion 15, and the raised portion 16 is used to guide part of the exhaust gas to the combustion chamber assembly 2 to dissipate heat to the combustion chamber assembly 2 to a certain extent.

[0046] In the illustrated embodiment of the present invention, the combustion chamber assembly 2 includes a barrel portion 21, a mounting seat 22 fixed to the barrel portion 21, a first spark plug 23 mounted on the mounting seat 22, a second spark plug 24 mounted on the mounting seat 22, and a diesel nozzle assembly 25 mounted on the mounting seat 22.

[0047] In the illustrated embodiment of the present invention, the barrel portion 21 is made of metal material, and the barrel portion 21 protrudes into the inner cavity 10. The barrel portion 21 includes a circumferential wall 211, a combustion chamber 212 surrounded by the circumferential wall 211, and an opening 213 located at the bottom of the barrel portion 21, and the opening 213 connects the combustion chamber 212 with the inner cavity 10.

[0048] In the illustrated embodiment of the present invention, the mounting seat 22 is made of a metal material, and the barrel portion 21 and the mounting seat 22 are separately provided and assembled and fixed together. The mounting seat 22 includes a mounting plate 221, a mounting barrel portion 222 integrally formed with the mounting plate 221, and a mounting convex portion 223 integrally formed with the mounting plate 221 and located beside the mounting barrel portion 222. The mounting plate 221 is fixedly mounted on the mounting portion 15, and the mounting barrel portion 222 and the mounting convex portion 223 both protrude upward from the mounting plate 221.

[0049] The diesel nozzle assembly 25 is installed in the installation cylinder portion 222, and the diesel nozzle assembly 25 includes a valve needle 251, a first swirl assembly 252 located at the bottom of the valve needle 251, a sleeve portion 253 at least partially located below the first swirl assembly 252, and a second swirl assembly 254 that cooperates with the sleeve portion 253.

[0050] In one embodiment of the present invention, the first swirl assembly 252 includes a plurality of swirl plates 2521 to form a swirl channel 2520. The swirl plate 2521 located at the top of the first swirl assembly 252 is provided with an inlet hole 2522, and the swirl plate 2521 located at the bottom of the first swirl assembly 252 is provided with a cut-off spray hole 2523. Each swirl plate 2521 is provided with a swirl groove. Diesel enters the swirl channel 2520 through the inlet hole 2522 of the first swirl assembly 252, and is sprayed into the mixing chamber 2531 from the cut-off spray hole 2523 at a certain angle and initial velocity. The first swirl assembly 252 can throttle diesel to a certain extent, so that the diesel nozzle assembly 25 can be better atomized at low flow. The cut-off spray hole improves the continuity of diesel injection at low power, and the accuracy of fuel injection metering can be greatly improved. In addition, diesel crushing is accelerated at high power, atomization is better, and ignition is faster. The present invention greatly improves the adaptability of the diesel nozzle assembly 25 to different working conditions by providing the first swirl assembly 252 .

[0051] In the illustrated embodiment of the present invention, the combustion chamber assembly 2 includes an annular airflow channel 255 located between the mounting cylinder portion 222 and the diesel nozzle assembly 25 .

[0052] The sleeve portion 253 includes a mixing cavity 2531 connected to the swirl channel 2520 and a first opening 2530 connected to the annular airflow channel 255. In the illustrated embodiment of the present invention, the sleeve portion 253 includes a hollow cylindrical portion 2533 and a hollow conical portion 2534 connected to the cylindrical portion 2533, and the mixing cavity 2531 penetrates the cylindrical portion 2533 and the conical portion 2534. The mixing cavity 2531 is connected to the combustion chamber 212. The second swirl assembly 254 is located outside the conical portion 2534, and a conical airflow channel 256 is formed between the second swirl assembly 254 and the conical portion 2534, and the conical airflow channel 256 is connected to the combustion chamber 212. The second swirl assembly 254 also includes a second connecting port 257 connecting the annular airflow channel 255 and the conical airflow channel 256.

[0053] In the illustrated embodiment of the present invention, the first spark plug 23 and the second spark plug 24 are mounted on the mounting convex portion 223 , and the first spark plug 23 and the second spark plug 24 both protrude into the combustion chamber 212 .

[0054] Specifically, the mounting bulge portion 223 is provided with an air intake passage 2230, a first wall portion 2231 for mounting the first spark plug 23, a first air hole 2232 penetrating the first wall portion 2231 and connected to the air intake passage 2230, a second wall portion 2233 for mounting the second spark plug 24, and a second air hole 2234 penetrating the second wall portion 2233 and connected to the air intake passage 2230.

[0055] In the illustrated embodiment of the present invention, a first airflow purge channel 2235 is further provided between the first spark plug 23 and the first wall portion 2231, and the first airflow purge channel 2235 penetrates the mounting plate 221 to communicate with the combustion chamber 212. Similarly, a second airflow purge channel 2236 is further provided between the second spark plug 24 and the second wall portion 2233, and the second airflow purge channel 2236 penetrates the mounting plate 221 to communicate with the combustion chamber 212. In the illustrated embodiment of the present invention, both the first airflow purge channel 2235 and the second airflow purge channel 2236 are annular. The first air hole 2232 connects the air intake channel 2230 with the first airflow purge channel 2235, so as to purge the first spark plug 23 with a portion of air to prevent carbon deposition. The second air hole 2234 communicates with the air intake passage 2230 and the second air flow purge passage 2236 to purge the second spark plug 24 with a portion of air to prevent carbon deposition.

[0056] The working principle of the burner 100 of the present invention is as follows:

[0057] Air path: air flows from the air intake channel 2230 into the mounting convex portion 223, wherein a portion of the air flows through the first air hole 2232 and enters the combustion chamber 212 from the first air purge channel 2235; a portion of the air flows through the second air hole 2234 and enters the combustion chamber 212 from the second air purge channel 2236; and most of the air flows into the annular air flow channel 255. The air entering the annular air flow channel 255 is divided into two paths, wherein one path of air flows through the first connecting port 2532 and enters the mixing chamber 2531; and the other path of air flows through the second connecting port 257 and enters the combustion chamber 212 from the conical air flow channel 256.

[0058] Oil circuit: The diesel flows from the oil channel of the diesel nozzle assembly 25 to the first swirl assembly 252, and the diesel flows into the mixing chamber 2531 through the swirl channel 2520. The diesel is atomized and mixed with the air passing through the first connecting port 2532 (first atomization). Another air path passing through the second connecting port 257 forms a swirl and is atomized and mixed with the diesel again (second atomization). Finally, the diesel entering the combustion chamber 212 has better ignition properties.

[0059] When the ignition conditions are met, the first spark plug 23 and the second spark plug 24 discharge to ignite the diesel. The combustion of the diesel will quickly increase the temperature of the exhaust gas, so that the exhaust gas after-treatment carrier in the diesel engine exhaust gas after-treatment system can quickly reach the operating temperature, which is beneficial to shorten the time it takes for the exhaust gas after-treatment carrier of the diesel engine to reach the operating temperature under cold start.

[0060] When the burner 100 is working, the diesel concentration near the first spark plug 23, the second spark plug 24 and the top of the combustion chamber 212 is high, and this area is prone to produce soot due to incomplete combustion, thereby causing carbon deposits on the first spark plug 23 and the second spark plug 24. Carbon deposits are extremely harmful. When the carbon deposits reach a certain level, the insulation between the first spark plug 23 and the second spark plug 24 and the mounting convex portion 223 will disappear, thereby causing certain safety issues. In the present invention, by introducing air from the first air hole 2232 and the second air hole 2234 to purge the first spark plug 23 and the second spark plug 24 respectively, the diesel concentration in this area can be reduced, the air-fuel ratio can be increased, the combustion efficiency can be improved, and the generation of soot can be reduced. At the same time, due to the enhanced air flow, soot is not easily adsorbed on the surface of the first spark plug 23, the second spark plug 24 and the spark plug mounting hole, thereby reducing the risk of carbon deposits in this area.

[0061] In addition, the present invention also discloses a detection method for detecting whether the burner 100 is successfully ignited. The detection circuit used in the detection method includes a burner controller 31, an ignition coil 32, a first ignition high-voltage wire 321 connecting the ignition coil 32 and the first ignition electrode 231 of the first spark plug 23, and a second ignition high-voltage wire 322 connecting the ignition coil 32 and the second ignition electrode 241 of the second spark plug 24.

[0062] The burner controller 31 sends an ignition request signal and receives a flame detection signal.

[0063] The ignition coil 32 includes a primary coil, a secondary coil and an iron core, wherein the primary coil is charged by a battery through switch control, the secondary coil increases the low voltage of the primary coil to a high voltage, and the iron core is used to enhance the magnetic field and electromagnetic induction effect.

[0064] The first ignition high-voltage line 321 transmits a high-voltage pulse signal to the first ignition electrode 231 , and the second ignition high-voltage line 322 transmits a high-voltage pulse signal to the second ignition electrode 241 .

[0065] The first ignition electrode 231 and the second ignition electrode 241 are used to break down the gas to form a spark by the high voltage difference between the two electrodes. The fuel is ignited by the spark to form a flame 4.

[0066] The working principle of the detection method is as follows: the burner controller 31 controls the charging and discharging of the primary coil. When the primary coil is powered on, a strong magnetic field is generated around it as the current increases, and the iron core stores the magnetic field energy. When the switch device disconnects the primary coil circuit, the magnetic field of the primary coil decays rapidly, and the secondary coil induces a very high voltage. This high-voltage pulse signal is transmitted to the first spark plug 23 and the second spark plug 24 through the first ignition high-voltage wire 321 and the second ignition high-voltage wire 322. The spark formed ignites the mixed gas of diesel and air to generate flame 4. When diesel burns, a large number of charged positive and negative ions and electrons are generated. These charged ions form a loop between the first ignition electrode 231, the second ignition electrode 241 and the shell 1 of the burner 100, generating a weak current signal, which is converted into a pulse width signal after amplification and output to the burner controller 31. Specifically, in one embodiment of the present invention, these charged ions form a loop between the first ignition electrode 231, the second ignition electrode 241, and the barrel portion 21 forming the combustion chamber 212, generating a weak current signal, which is converted into a pulse width signal after amplification and output to the burner controller 31. The burner controller 31 determines whether there is a stable flame 4 according to the duty cycle of the pulse width signal, thereby determining whether the ignition is successful.

[0067] The detection method comprises the following steps:

[0068] (a) The burner controller 31 sends an ignition request signal to the ignition coil 32;

[0069] (b) the ignition coil 32 transmits the high voltage pulse signal to the first spark plug 23 and the second spark plug 24 through the first ignition high voltage wire 321 and the second ignition high voltage wire 322;

[0070] (c) determining whether a current signal is generated by forming a loop between the first ignition electrode 231, the second ignition electrode 241, and the housing 1 of the burner 100;

[0071] (d) If yes, the ignition is judged to be successful; if no, the ignition is judged to be unsuccessful.

[0072] In step (c), the detection method includes determining whether a current signal is generated between the first ignition electrode 231 , the second ignition electrode 241 , and the barrel portion 21 forming the combustion chamber 212 due to the formation of a loop.

[0073] Between step (c) and step (d), the detection method further comprises:

[0074] The current signal is amplified and converted into a pulse width signal and output to the burner controller 31 .

[0075] In step (d), the burner controller 31 determines whether there is a stable flame 4 according to the duty cycle of the pulse width signal, thereby determining whether the ignition is successful.

[0076] The detection method of the present invention has the following beneficial effects:

[0077] (1) Due to the fast transmission speed of the electrical signal, the time to judge whether the ignition is successful is short. Since a large amount of fuel injection and a low air-fuel ratio are required during ignition, although this is conducive to rapid ignition, the emission of hydrocarbons will be higher. The present invention uses ion signals to judge whether the ignition is successful. The burner controller 31 can adjust the air-fuel ratio in advance to ensure that the fuel burns more fully.

[0078] (2) When the flame 4 is lost, the present invention can also make a quick judgment, thereby preventing excessive fuel injection from causing excessive hydrocarbon emissions.

[0079] (3) It is helpful to diagnose carbon deposits on the ignition electrode (for example, the first ignition electrode 231 and / or the second ignition electrode 241). When the ignition electrode is working without fuel injection, it can be judged whether there is carbon deposit around the ignition electrode based on the feedback pulse width signal; when there is no flame 4 but the ion signal still exists, it means that a circuit may be formed between the ignition electrode and the cylinder portion 21 forming the combustion chamber 212 due to carbon deposits.

[0080] The above embodiments are only used to illustrate the present invention but not to limit the technical solutions described in the present invention. The understanding of this specification should be based on the technicians in the relevant technical field. Although this specification has described the present invention in detail with reference to the above embodiments, ordinary technicians in the field should understand that technicians in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A burner for use in a diesel engine exhaust treatment system, characterized in that: The burner comprises: a housing, the housing comprising an inner cavity for allowing exhaust gas to flow; and A combustion chamber assembly, the combustion chamber assembly is mounted on the housing, and the combustion chamber assembly comprises: A barrel portion, the barrel portion comprising a circumferential wall and a combustion chamber surrounded by the circumferential wall, the combustion chamber being in communication with the inner cavity; A mounting seat, the mounting seat is fixed to the barrel portion, the mounting seat comprises an air intake passage, a first wall portion, a second wall portion and a mounting barrel portion; a first spark plug, the first spark plug being mounted on the first wall portion, the first spark plug protruding into the combustion chamber; a second spark plug, the second spark plug being mounted on the second wall portion, the second spark plug protruding into the combustion chamber; and A diesel nozzle assembly, the diesel nozzle assembly is mounted on the mounting cylinder portion, and the diesel nozzle assembly is used to spray diesel into the combustion chamber; Wherein, the diesel nozzle assembly includes a valve needle, a first swirl assembly located at the bottom of the valve needle, and a sleeve portion at least partially located below the first swirl assembly, the first swirl assembly includes an inlet hole and a shut-off nozzle hole, the sleeve portion is provided with a mixing chamber connected to the shut-off nozzle hole, the mixing chamber is used for mixing diesel and air, and the mixing chamber is connected to the combustion chamber.

2. The burner according to claim 1, characterized in that: The first swirl assembly includes a plurality of swirl plates to form a swirl channel; the inlet hole is arranged on the top swirl plate, and the intercepting spray hole is arranged on the bottom swirl plate.

3. The burner according to claim 1, characterized in that: The combustion chamber assembly includes an annular airflow channel located between the mounting barrel portion and the diesel nozzle assembly, the annular airflow channel is connected to the air intake channel, and the sleeve portion includes a first opening connecting the annular airflow channel and the mixing chamber.

4. The burner according to claim 3, characterized in that: The diesel nozzle assembly further includes a second swirl assembly matched with the sleeve portion, and the second swirl assembly includes a second communication port connecting the annular airflow channel and the combustion chamber.

5. The burner according to claim 4, characterized in that: The sleeve portion includes a hollow cylindrical portion and a hollow conical portion connected to the cylindrical portion, the mixing chamber passes through the cylindrical portion and the conical portion, the second swirl component is located on the outside of the conical portion, a conical airflow channel is formed between the second swirl component and the conical portion, the second connecting port connects the annular airflow channel and the conical airflow channel, and the conical airflow channel is connected to the combustion chamber.

6. The burner according to claim 1, characterized in that: The barrel portion and the mounting seat are both made of metal material, and the barrel portion and the mounting seat are separately arranged and assembled and fixed together.

7. The burner according to claim 1, characterized in that: The housing is provided with a raised mounting portion; The mounting seat comprises a mounting plate and a mounting convex portion, the mounting plate is mounted and fixed to the mounting portion, the mounting convex portion and the mounting cylindrical portion are both integrally formed with the mounting plate, and the mounting convex portion and the mounting cylindrical portion both protrude from the mounting plate; A first airflow purge channel is also provided between the first spark plug and the first wall portion, and the mounting convex portion is provided with a first air hole connecting the air intake channel and the first airflow purge channel, so as to use a part of the air to purge the first spark plug.

8. The burner according to claim 7, characterized in that: A second airflow purge channel is also provided between the second spark plug and the second wall portion, and the mounting convex portion is provided with a second air hole connecting the air intake channel and the second airflow purge channel, so as to use a part of the air to purge the second spark plug.

9. The burner according to claim 8, characterized in that: The first airflow purge channel and the second airflow purge channel are both annular and both pass through the mounting plate.

10. The burner according to claim 7, characterized in that: The shell is also provided with a raised portion protruding toward the mounting portion, and the raised portion is used to guide part of the exhaust gas to the combustion chamber assembly.

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