CN115823581B - Injector of torch igniter - Google Patents

Abstract

The invention discloses an injector of a torch igniter, which comprises a mounting seat, an end cover and nozzle assemblies, wherein the mounting seat is in sealing connection with the opening end of a combustion chamber, at least two groups of nozzle assemblies are arranged between the mounting seat and the end cover in a sealing way, a fuel main oil way and an injector main gas way are arranged on the end cover, the fuel main oil way and the injector main gas way are respectively communicated with all the nozzle assemblies at the same time, and the oil injection end of the nozzle assemblies penetrates through the mounting seat and is communicated with the combustion chamber. The beneficial effects are that: according to the invention, two or more groups of nozzle assemblies are integrated on one injector at the same time, so that the content of fuel in the combustion chamber is improved on the premise of improving the atomization quality of liquid fuel, the structural requirement of a torch igniter can be met through the combined use of two or three nozzle assemblies, the adaptability of the torch igniter is improved, the fuel atomization quality of the whole spray field can be improved through the combined use of the elliptical spray through holes and the circular spray through holes, and the flame stability in the combustion chamber of the torch igniter is improved.

Description

A kind of injector for torch igniter

Technical field

The present invention relates to an important component of an ignition device, in particular to an injector of a torch igniter, and belongs to the technical field of igniters.

Background technique

As a micro burner, the torch igniter generally ignites a small flow of liquid fuel with a spark plug to produce a stable high-temperature gas flame. Then the high-temperature gas flame ignites the fuel in the main combustion chamber of the combustion heater. Because the torch igniter has large ignition energy and is reliable It has the characteristics of high performance and quick start, and is usually used as an ignition starting device for combustion heaters. For air and liquid fuel type torch igniters, liquid fuel needs to be atomized with the help of an atomization device. Compared with conventional atomization nozzles, bubble atomization nozzles have good atomization performance under low pressure conditions and are less affected by viscosity. and low energy consumption. The bubble atomization nozzle is applied to the torch igniter to promote the atomization and evaporation of liquid fuel in the combustion chamber of the torch igniter, achieve rapid mixing and combustion of oxidant and liquid fuel, and then produce stable high temperature. gas flame to ensure the torch igniter effectively activates the combustion heater.

In the design of the torch igniter, the bubble atomization nozzle is a key part that determines the atomization performance of liquid fuel. The key to the design of the bubble atomization nozzle is to form spray particles suitable for evaporation, mixing, ignition and combustion in the combustion chamber. Path field, velocity field and flow intensity ratio distribution. The selection of structural parameters of the bubble atomization nozzle and the number of nozzles largely determine the nozzle atomization characteristics such as the size of the spray angle, particle size and velocity distribution, which in turn determines the stability of the flame in the combustion chamber of the torch igniter.

The atomization quality will improve as the gas-to-liquid ratio increases, but an excessively high gas-to-liquid ratio will inevitably lead to a reduction in fuel content, thereby reducing the ignition energy of the torch, and even flameout. At present, the existing technology cannot improve the atomization quality of liquid fuel in the combustion chamber of the torch igniter while increasing the fuel content, thereby failing to reduce the difficulty of torch ignition and improve the stability of torch ignition.

Contents of the invention

Purpose of the invention: The purpose of the invention is to address the problems existing in the prior art and propose an injector for a torch igniter that can simultaneously improve the atomization quality of liquid fuel and the content of fuel in the combustion chamber of the torch igniter.

Technical solution: an injector of a torch igniter, including a mounting seat, an end cover and a nozzle assembly. The mounting seat is sealingly connected to the open end of the combustion chamber. At least two groups are sealingly installed between the mounting seat and the end cover. Nozzle assembly, the end cover is provided with a main fuel oil path and a main air path for the injector. The main fuel oil path and the main air path for the injector are connected to all nozzle assemblies at the same time. The fuel injection of the nozzle assembly The end passes through the mounting base and is connected to the combustion chamber.

The invention integrates two or more groups of nozzle assemblies on one injector at the same time, and simultaneously supplies oil and air to the nozzle assembly through the main fuel oil passage on the end cover and the main air passage of the injector, thereby increasing the total fuel supply. Under such circumstances, the fuel supply amount of a single nozzle assembly is reduced, thereby improving the atomization quality of each nozzle assembly; on the premise of improving the atomization quality of liquid fuel, the fuel content in the combustion chamber is increased, thereby reducing the difficulty of ignition.

Preferably, in order to improve the maintenance convenience of the present invention, the mounting base is provided with an oxidant supply pipeline connected to the combustion chamber. By integrating the fuel injection assembly and the oxidizer supply pipeline on the mounting base at the same time, the entire torch igniter supply system can be disassembled and assembled, improving maintenance convenience. At the same time, the oxidizer supply pipeline and the fuel injection assembly are located on the mounting base at the same time. The entire torch igniter is on the same side, therefore, more conducive to full mixing of oxidizer and fuel, improving point stability.

Preferably, in order to improve the atomization quality of fuel, the nozzle assembly includes a nozzle body and an injection head. The injection head is installed at the injection end of the nozzle body. The nozzle body is provided with a liquid fuel oil circuit and a branch gas pipe. The liquid fuel oil circuit and the branch gas pipeline are respectively connected with the gas-liquid mixing chamber; the center of the injection head is provided with an injection through hole, and the inlet of the injection through hole is connected with the gas-liquid mixing chamber , the outlet of the injection through hole is connected with the combustion chamber. The invention adopts a bubble atomization nozzle and utilizes the characteristics of the bubble atomization nozzle to have good atomization quality under low pressure conditions, thereby improving the atomization quality of liquid fuel in the combustion chamber.

Preferably, in order to further improve the atomization quality of the fuel, an air guide pipe is provided on the branch gas pipeline. The branch gas pipe is inserted into the gas-liquid mixing chamber through the air guide pipe. The air guide pipe is located in the gas-liquid mixing chamber. There are through holes evenly distributed on the tube wall. The atomization quality of fuel in the gas-liquid mixing chamber can be improved through the through holes on the wall of the air guide pipe.

Preferably, in order to adapt to the structural requirements of the torch igniter, two nozzle assemblies are sealed and installed between the mounting base and the end cap. The two nozzle assemblies are symmetrical about the center of the mounting base, and the cross-sections at the exits of the two injection through holes are elliptical. shape structure and circular structure.

The elliptical spray hole is used to improve the entire spray field by taking advantage of the advantages of the elliptical spray hole having different flow fields in the long and short axis directions, as well as a larger spray cone angle, shorter jet breakup length and higher oil and gas mixing quality. The quality of fuel atomization improves the stability of the flame in the combustion chamber of the torch igniter. The use of different shapes of spray holes and staggered arrangements will result in different spray flow fields in the spray field and different particle sizes, thereby expanding the particle size range in the spray field and thus broadening the ignition range of the torch igniter. , reduce the difficulty of torch ignition and improve the stability of the flame in the combustion chamber of the torch igniter.

Preferably, in order to adapt to the structural requirements of the torch igniter and further improve the atomization quality of the liquid fuel in the combustion chamber, three nozzle assemblies are sealed and installed between the mounting base and the end cover, and the three nozzle assemblies are distributed on the mounting base. On the circumference with the central axis as the center of the circle, the cross section of the outlet of one of the injection through holes is an elliptical structure, and the cross section of the exits of the other two injection holes is a circular structure.

The synchronous operation of the three nozzle assemblies will reduce the fuel supply volume of a single nozzle component while increasing the total fuel supply volume, thereby improving the atomization quality of each nozzle component; at the same time, using different shapes of injection holes and staggered arrangements will The spray flow field in the spray field is different, and the particle size is also different, thereby expanding the particle size range in the spray field, thereby broadening the ignition range of the torch igniter, reducing the difficulty of torch ignition, and improving the combustion of the torch igniter. Chamber flame stability.

Preferably, in order to adapt to the structural requirements of the torch igniter and further improve the atomization quality of the liquid fuel in the combustion chamber, three nozzle assemblies are sealed and installed between the mounting base and the end cover, and the three nozzle assemblies are distributed on the mounting base. On the circumference with the central axis as the center of the circle, the cross section of the outlet of one of the injection holes is a circular structure, and the cross section of the exits of the other two injection holes is an elliptical structure.

The synchronous operation of the three nozzle assemblies will reduce the fuel supply volume of a single nozzle component while increasing the total fuel supply volume, thereby improving the atomization quality of each nozzle component; at the same time, two elliptical structure injection holes and a circular The combined use and staggered arrangement of the spray holes in the spray field will make the spray flow field in the spray field different, and the particle size will also be different, thereby expanding the particle size range in the spray field, and thus broadening the ignition of the torch igniter. range, reducing the difficulty of torch ignition and improving the stability of the flame in the combustion chamber of the torch igniter.

Preferably, in order to further improve the atomization quality of the liquid fuel in the combustion chamber, the long axes of the injection holes with an elliptical cross-section at the two outlets are not parallel. Through two spray holes with non-parallel long axes in an elliptical structure, the spray flow field in the spray field can be further made different, and the particle size can also be different, thereby expanding the particle size range in the spray field, and thus broadening the The ignition range of the torch igniter reduces the difficulty of torch ignition and improves the stability of the flame in the combustion chamber of the torch igniter.

Preferably, in order to improve the atomization quality of the liquid fuel in the combustion chamber, a wire mesh is provided between the gas-liquid mixing chamber and the injection head. The wire mesh can effectively divide the large bubbles in the gas-liquid mixing chamber into several uniform and stable small bubbles, thereby reducing the average diameter of atomized particles and improving the atomization quality of liquid fuel.

Beneficial effects: The present invention integrates two or more nozzle assemblies on one injector at the same time, and simultaneously supplies oil and air to the nozzle assembly through the main fuel oil path on the end cover and the main air path of the injector, so that the total oil supply Reduce the fuel supply amount of a single nozzle assembly when the amount is increased, thereby improving the atomization quality of each nozzle assembly; on the premise of improving the atomization quality of liquid fuel, increase the fuel content in the combustion chamber, thereby reducing the difficulty of ignition; adopt The elliptical spray hole uses the advantages of the elliptical spray hole to have different flow fields in the long and short axis directions, as well as a larger spray cone angle, shorter jet breakup length and higher oil and gas mixing quality, thereby improving the overall spray field. The quality of fuel atomization improves the stability of the flame in the combustion chamber of the torch igniter. The use of different shapes of spray holes and staggered arrangements will result in different spray flow fields in the spray field and different particle sizes, thereby expanding the particle size range in the spray field and thus broadening the ignition range of the torch igniter. , reduce the difficulty of torch ignition and improve the stability of the flame in the combustion chamber of the torch igniter; the structural requirements of the torch igniter can be adapted to the combined use of two or three nozzle assemblies, which improves the adaptability of the present invention. The combination of the hole and the circular injection hole can improve the fuel atomization quality of the entire spray field and improve the stability of the flame in the combustion chamber of the torch igniter.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without exerting creative efforts.

Figure 1 is a schematic diagram of the installation structure of the present invention;

Figure 2 is a schematic structural diagram of the nozzle assembly of the present invention;

Figure 3 is an enlarged view of the partial structure of the injection end of the nozzle assembly of the present invention;

Figure 4 is a schematic diagram of the three-dimensional coordinate system based on the mounting base of the present invention;

Figure 5 is a structural layout diagram of two nozzle assemblies installed on the mounting base of the present invention;

Figure 6 is a structural layout diagram of the first embodiment of installing three nozzle assemblies on the mounting base of the present invention;

Figure 7 is a structural layout diagram of a second embodiment of three nozzle assemblies installed on the mounting base of the present invention;

Figure 8 is a schematic structural diagram of the metal mesh of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientations or positional relationships indicated by "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply the device or device referred to. Elements must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations of the invention.

In the present invention, unless otherwise expressly provided and limited, the term "above" or "below" a first feature of a second feature may include direct contact between the first and second features, or may also include the first and second features. Not in direct contact but through additional characteristic contact between them. Furthermore, the terms "above", "above" and "above" a first feature on a second feature include the first feature being directly above and diagonally above the second feature, or simply mean that the first feature is higher in level than the second feature. “Below”, “under” and “under” the first feature is the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature.

As shown in Figure 1, an injector of a torch igniter includes a mounting seat 1, an end cover 2 and a nozzle assembly 3. The mounting seat 1 is sealingly connected to the open end of the combustion chamber 4. The mounting seat 1 and the end At least two sets of nozzle assemblies 3 are installed and sealed between the covers 2. The end cover 2 is provided with a main fuel oil passage 21 and a main injector air passage 22. The main fuel oil passage 21 and the main injector air passage are 22 are respectively connected to all nozzle assemblies 3 at the same time, and the fuel injection ends of the nozzle assemblies 3 are connected to the combustion chamber 4 through the mounting base 1 .

The present invention integrates two or more groups of nozzle assemblies 3 on one injector at the same time, and simultaneously supplies fuel and air to the nozzle assembly 3 through the fuel main oil passage 21 and the injector main air passage 22 on the end cover 2, so that the total When the fuel supply volume is increased, the fuel supply volume of a single nozzle assembly is reduced, thereby improving the atomization quality of each nozzle assembly 3; on the premise of improving the atomization quality of liquid fuel, the fuel content in the combustion chamber 4 is increased, thereby Reduce the difficulty of ignition.

In order to improve the maintenance convenience of the present invention, the mounting base 1 is provided with an oxidant supply pipeline 11 that communicates with the combustion chamber 4 . By integrating the fuel injection assembly 3 and the oxidant supply pipeline 11 on the mounting base 1 at the same time, the entire torch igniter supply system can be disassembled and assembled, improving maintenance convenience. At the same time, the oxidant supply pipeline 11 and the fuel injection assembly 3 are simultaneously It is located on the same side of the entire torch igniter on the mounting base 1. Therefore, it is more conducive to the complete mixing of oxidizer and fuel and improves the stability of the point.

As shown in Figures 2 and 3, in order to improve the atomization quality of fuel, the nozzle assembly 3 includes a nozzle body 31 and an injection head 32. The injection head 32 is installed at the injection end of the nozzle body 31. Inside the nozzle body 31 There is a liquid fuel oil line 33, a branch gas line 34 and a gas-liquid mixing chamber 35. The liquid fuel oil line 33 and the branch gas line 34 are respectively connected with the gas-liquid mixing chamber 35; the injection head 32 is provided with a central There is an injection through hole 321 , the inlet of the injection through hole 321 is connected to the gas-liquid mixing chamber 35 , and the outlet of the injection through hole 321 is connected to the combustion chamber 4 . The present invention adopts a bubble atomization nozzle and utilizes the characteristics of the bubble atomization nozzle to have good atomization quality under low pressure conditions, thereby improving the atomization quality of the liquid fuel in the combustion chamber 4 .

In order to further improve the atomization quality of the fuel, the branch gas pipeline 34 is provided with an air guide pipe 36. The branch gas pipe 34 is inserted into the gas-liquid mixing chamber 35 through the air guide pipe 36. The air guide pipe 36 is located at The tube wall in the gas-liquid mixing chamber 35 is evenly distributed with through holes 361 . The atomization quality of the fuel in the gas-liquid mixing chamber 35 can be improved through the through hole 361 on the wall of the air guide pipe 36 .

Embodiment 1

As shown in Figures 4 and 5, in order to adapt to the structural requirements of the torch igniter, two nozzle assemblies 3 are sealed and installed between the mounting base 1 and the end cover 2. The two nozzle assemblies 3 are symmetrical about the center of the mounting base 1. The cross-sections at the exits of the injection through holes 321 are respectively oval structure and circular structure.

Using an elliptical injection through hole 321, the injection through hole 321 has different flow fields in the long and short axis directions, as well as the advantages of a larger spray cone angle, a short jet breakup length and a higher oil and gas mixing quality, thereby improving the entire spray. The quality of fuel atomization in the field improves the stability of the flame in the combustion chamber of the torch igniter. Using different shapes of spray holes 321 and staggered arrangements will result in different spray flow fields in the spray field and different particle sizes, thereby expanding the range of particle sizes in the spray field and thus broadening the ignition of the torch igniter. range, reducing the difficulty of torch ignition and improving the stability of the flame in the combustion chamber 4 of the torch igniter.

Embodiment 2

As shown in Figures 4 and 6, in order to adapt to the structural requirements of the torch igniter and further improve the atomization quality of the liquid fuel in the combustion chamber, three nozzle assemblies 3 are sealed and installed between the mounting seat 1 and the end cover 2. The nozzle assemblies 3 are evenly distributed on the circumference with the central axis of the mounting base 1 as the center. The cross section of the outlet of one of the injection through holes 321 is an elliptical structure, and the cross section of the other two injection through holes 321 is a circular structure.

The synchronous operation of the three nozzle assemblies 3 will reduce the oil supply amount of a single nozzle assembly 3 while increasing the total oil supply amount, thereby improving the atomization quality of each nozzle assembly 3; at the same time, using different shapes of injection through holes 321 And the misaligned arrangement will make the spray flow field in the spray field different, and the particle size will also be different, thus expanding the particle size range in the spray field, thereby broadening the ignition range of the torch igniter, reducing the difficulty of torch ignition, and improving The stability of the flame in the combustion chamber 4 of the torch igniter.

Embodiment 3

As shown in Figures 4 and 7, in order to adapt to the structural requirements of the torch igniter and further improve the atomization quality of the liquid fuel in the combustion chamber, three nozzle assemblies 3 are sealed and installed between the mounting seat 1 and the end cover 2. The nozzle assemblies 3 are evenly distributed on the circumference with the central axis of the mounting base 1 as the center. One of the injection through holes 321 has a circular cross-section at the outlet, and the other two injection through holes 321 have an elliptical cross-section at the outlet.

The synchronous operation of the three nozzle components 3 will reduce the fuel supply volume of a single nozzle component 3 while increasing the total fuel supply volume, thereby improving the atomization quality of each nozzle component 3; at the same time, the two elliptical structure injection holes The combined use and staggered arrangement of 321 and a circular structure injection through hole 321 will make the spray flow field in the spray field different and the particle size also different, thus expanding the range of particle size in the spray field, thereby broadening the The ignition range of the torch igniter reduces the difficulty of torch ignition and improves the stability of the flame in the combustion chamber of the torch igniter.

In order to further improve the atomization quality of the liquid fuel in the combustion chamber, the long axes of the injection through holes 321 with elliptical cross-sections at the two outlets are perpendicular to each other. Through the two elliptical structure spray holes with their long axes perpendicular to each other, the spray flow field in the spray field can be further made different, and the particle sizes are also different, thereby expanding the particle size range in the spray field, and thus broadening the The ignition range of the torch igniter reduces the difficulty of torch ignition and improves the stability of the flame in the combustion chamber of the torch igniter.

As shown in FIG. 8 , in order to improve the atomization quality of the liquid fuel in the combustion chamber, a metal mesh 37 is provided between the gas-liquid mixing chamber 35 and the injection head 32 . The wire mesh 37 can be used to effectively divide the large bubbles in the gas-liquid mixing chamber 35 into several uniform and stable small bubbles, thereby reducing the average diameter of the atomized particles and improving the atomization quality of the liquid fuel.

Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on its differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple. For relevant details, please refer to the description in the method section.

The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined in this specification may be practiced in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. An injector for a torch igniter, characterized in that it includes a mounting seat (1), an end cover (2) and a nozzle assembly (3). The mounting seat (1) is connected to the open end of the combustion chamber (4). Sealed connection, at least two sets of nozzle assemblies (3) are installed sealingly between the mounting seat (1) and the end cover (2), and the end cover (2) is provided with a main fuel oil circuit (21) and an injection The main air path (22) of the injector, the main fuel oil path (21) and the main air path (22) of the injector are connected to all nozzle assemblies (3) at the same time, and the injection end of the nozzle assembly (3) passes through The mounting base (1) is connected with the combustion chamber (4); The mounting base (1) is provided with an oxidant supply pipeline (11) connected to the combustion chamber (4); The nozzle assembly (3) includes a nozzle body (31) and an injection head (32). The injection head (32) is installed at the injection end of the nozzle body (31). The nozzle body (31) is provided with liquid fuel. Oil pipeline (33), branch gas pipeline (34) and gas-liquid mixing chamber (35), the liquid fuel oil pipeline (33) and branch gas pipeline (34) are respectively connected with the gas-liquid mixing chamber (35) ; The injection head (32) is provided with an injection through hole (321) in the center, the inlet of the injection through hole (321) is connected to the gas-liquid mixing chamber (35), and the outlet of the injection through hole (321) is connected to the combustion chamber. Room (4) is connected; Two nozzle assemblies (3) are sealed and installed between the mounting base (1) and the end cover (2). The two nozzle assemblies (3) are symmetrical about the center of the mounting base (1), and the two injection through holes (321) The cross-sections at the exit are oval structure and circular structure respectively. 2. An injector for a torch igniter, characterized in that it includes a mounting seat (1), an end cover (2) and a nozzle assembly (3). The mounting seat (1) is connected to the open end of the combustion chamber (4). Sealed connection, at least two sets of nozzle assemblies (3) are installed sealingly between the mounting seat (1) and the end cover (2), and the end cover (2) is provided with a main fuel oil circuit (21) and an injection The main air path (22) of the injector, the main fuel oil path (21) and the main air path (22) of the injector are connected to all nozzle assemblies (3) at the same time, and the injection end of the nozzle assembly (3) passes through The mounting base (1) is connected with the combustion chamber (4); The mounting base (1) is provided with an oxidant supply pipeline (11) connected to the combustion chamber (4); The nozzle assembly (3) includes a nozzle body (31) and an injection head (32). The injection head (32) is installed at the injection end of the nozzle body (31). The nozzle body (31) is provided with liquid fuel. Oil pipeline (33), branch gas pipeline (34) and gas-liquid mixing chamber (35), the liquid fuel oil pipeline (33) and branch gas pipeline (34) are respectively connected with the gas-liquid mixing chamber (35) ; The injection head (32) is provided with an injection through hole (321) in the center, the inlet of the injection through hole (321) is connected to the gas-liquid mixing chamber (35), and the outlet of the injection through hole (321) is connected to the combustion chamber. Room (4) is connected; Three nozzle assemblies (3) are sealed and installed between the mounting base (1) and the end cover (2). The three nozzle assemblies (3) are evenly distributed on the circumference with the central axis of the mounting base (1) as the center, where The cross-section at the outlet of one injection through hole (321) is an elliptical structure, and the cross-section at the outlet of the other two injection through holes (321) is a circular structure. 3. An injector for a torch igniter, characterized in that it includes a mounting seat (1), an end cover (2) and a nozzle assembly (3). The mounting seat (1) is connected to the open end of the combustion chamber (4). Sealed connection, at least two sets of nozzle assemblies (3) are installed sealingly between the mounting seat (1) and the end cover (2), and the end cover (2) is provided with a main fuel oil circuit (21) and an injection The main air path (22) of the injector, the main fuel oil path (21) and the main air path (22) of the injector are connected to all nozzle assemblies (3) at the same time, and the injection end of the nozzle assembly (3) passes through The mounting base (1) is connected with the combustion chamber (4); The mounting base (1) is provided with an oxidant supply pipeline (11) connected to the combustion chamber (4); The nozzle assembly (3) includes a nozzle body (31) and an injection head (32). The injection head (32) is installed at the injection end of the nozzle body (31). The nozzle body (31) is provided with liquid fuel. Oil pipeline (33), branch gas pipeline (34) and gas-liquid mixing chamber (35), the liquid fuel oil pipeline (33) and branch gas pipeline (34) are respectively connected with the gas-liquid mixing chamber (35) ; The injection head (32) is provided with an injection through hole (321) in the center, the inlet of the injection through hole (321) is connected to the gas-liquid mixing chamber (35), and the outlet of the injection through hole (321) is connected to the combustion chamber. Room (4) is connected; Three nozzle assemblies (3) are sealed and installed between the mounting base (1) and the end cover (2). The three nozzle assemblies (3) are evenly distributed on the circumference with the central axis of the mounting base (1) as the center, where The cross-section at the outlet of one injection through hole (321) is a circular structure, and the cross-section at the outlet of the other two injection through holes (321) is an elliptical structure. 4. The injector of the torch igniter according to claim 3, characterized in that the long axes of the injection through holes (321) with an elliptical cross-section at the two exits are not parallel. 5. The injector of the torch igniter according to any one of claims 1-3, characterized in that: the branch gas pipeline (34) is provided with a gas guide pipe (36), and the branch gas pipeline (34) is provided with a gas guide pipe (36). The gas pipeline (34) is inserted into the gas-liquid mixing chamber (35) through the air guide tube (36). The air guide tube (36) is located in the gas-liquid mixing chamber (35) and has through holes (361) evenly distributed on the wall of the gas-liquid mixing chamber (35). . 6. The injector of the torch igniter according to any one of claims 1-3, characterized in that: a metal mesh ( 37).