A torch igniter

Abstract

The present invention discloses a torch igniter, comprising an igniter body and a nozzle assembly, wherein a hollow combustion chamber is provided inside the igniter body, the nozzle assembly penetrates the side wall of the igniter body and is in communication with the combustion chamber, a main oxidant inlet and a flame injection port are respectively provided at both ends of the igniter body, a spark plug mounting seat is provided on the side wall of the igniter body, and the nozzle assembly is located on the side wall between the main oxidant inlet and the spark plug mounting seat; the number of the nozzle assemblies is at least two and is evenly distributed on the side wall along the circumferential direction of the outer diameter of the igniter body, and the extension lines of the injection ports of the nozzle assemblies intersect. Beneficial effects: The present invention has a simple overall structure by combining a bubble atomizing nozzle with a torch igniter, improves the collision probability of atomized particles, enhances the atomization quality of liquid fuel, reduces the difficulty of torch ignition, and enhances the stability of the flame in the combustion chamber of the torch igniter.

Description

Technical Field

[0001] The present invention relates to an ignition device, in particular to a torch igniter which can reduce the ignition difficulty of the torch igniter and improve the ignition stability of the torch, belonging to the technical field of igniters. Background Art

[0002] As a micro-burner, the torch igniter generally uses a spark plug to ignite a small flow of liquid fuel, generating a stable high-temperature gas flame. The high-temperature gas flame then ignites the fuel in the main combustion chamber of the combustion heater. Due to its high ignition energy, high reliability, and rapid startup, the torch igniter is usually used as the ignition and starting device for the combustion heater. For air and liquid fuel torch igniters, the liquid fuel needs to be atomized with the help of an atomizer. Compared with conventional atomizer nozzles, bubble atomizer nozzles have the characteristics of achieving good atomization performance under low pressure conditions, being less affected by viscosity, and having low energy consumption. Bubble atomizer nozzles are applied to torch igniters to promote the atomization and evaporation of the liquid fuel in the torch igniter's combustion chamber, achieving rapid mixing and combustion of the oxidizer and liquid fuel, and thus generating a stable high-temperature gas flame, ensuring that the torch igniter effectively starts the combustion heater.

[0003] In flare igniter design, the bubble atomizer nozzle is a key component in determining the atomization performance of liquid fuels. The key to bubble atomizer design is to create a spray particle size, velocity field, and flow intensity ratio distribution suitable for evaporation, mixing, ignition, and combustion in the combustion chamber. The selection of bubble atomizer nozzle structural parameters and the number of nozzles largely determine the nozzle atomization characteristics such as the spray angle, particle size, and velocity distribution, which in turn determines the flame stability within the flare igniter combustion chamber.

[0004] At present, the existing technology is insufficient in improving the atomization quality of liquid fuel in the combustion chamber of the torch igniter, making it difficult to reduce the difficulty of torch ignition and improve the stability of torch ignition. Summary of the Invention

[0005] Purpose of the invention: The purpose of the present invention is to address the problems existing in the prior art and to propose a torch igniter that can reduce the difficulty of ignition of the torch igniter and improve the stability of torch ignition.

[0006] Technical solution: A torch igniter includes an igniter body and a nozzle assembly, wherein a hollow combustion chamber is provided inside the igniter body, the nozzle assembly passes through the side wall of the igniter body and is connected to the combustion chamber, a main oxidant inlet and a flame injection port are respectively provided at both ends of the igniter body, a spark plug mounting seat is provided on the side wall of the igniter body, and the nozzle assembly is located on the side wall between the main oxidant inlet and the spark plug mounting seat; the number of the nozzle assemblies is at least two and is evenly distributed on the side wall along the circumferential direction of the outer diameter of the igniter body, and the extension lines of the injection ports of the nozzle assemblies intersect.

[0007] The present invention utilizes uniformly distributed nozzle assemblies and intersecting extended lines of their nozzles to increase the probability of collision among atomized particles. This results in re-fragmentation of the atomized particles, improving the atomization quality of the liquid fuel, reducing the difficulty of flare ignition, and enhancing flame stability within the flare igniter's combustion chamber. To broaden the flare igniter's ignition range, the spark plug mounting base is positioned near the flame nozzle, while the nozzle assembly is positioned near the main oxidant inlet. Multiple spark plug bases are also positioned on the combustion chamber wall, allowing for selection of ignition positions based on actual conditions.

[0008] Preferably, to further improve the atomization quality of the liquid fuel, the nozzle assembly is a bubble atomizing nozzle, comprising a nozzle body and an injector head, the injector head being mounted at the injection end of the nozzle body. The nozzle body is provided with a liquid fuel oil circuit, a branch gas line, and a gas-liquid mixing chamber, the liquid fuel oil circuit and the branch gas line being respectively connected to the gas-liquid mixing chamber; a spray hole is provided at the center of the injector head, the inlet of the spray hole being connected to the gas-liquid mixing chamber, and the outlet of the spray hole being connected to the combustion chamber. By combining the bubble atomizing nozzle with a torch igniter, and utilizing the bubble atomizing nozzle's excellent atomization quality under low-pressure conditions, the atomization quality of the liquid fuel in the combustion chamber is thereby improved.

[0009] To further enhance the atomization quality of the liquid fuel, the injection through-hole has an elliptical cross-section at its outlet. This elliptical cross-section utilizes the advantages of a larger spray cone angle, shorter jet breakup length, and higher oil-gas mixing quality over a circular nozzle, thereby improving the atomization quality of the fuel throughout the spray field and enhancing the flame stability within the flare igniter combustion chamber.

[0010] Preferably, in order to increase the injection speed of the atomized fuel, the inlet of the injection through hole is a funnel-shaped structure expanding toward the gas-liquid mixing chamber, and the bottom end of the funnel-shaped structure is smoothly connected to the top end of the through hole of the elliptical structure.

[0011] Preferably, to further improve the atomization quality of the liquid fuel, 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, stable small bubbles, thereby reducing the average diameter of the atomized particles and improving the atomization quality of the liquid fuel.

[0012] In a preferred embodiment, to further enhance the atomization quality of the liquid fuel, the injection holes, each having an elliptical cross-section, are arranged in a staggered pattern. Multiple nozzle assemblies are disposed on the combustion chamber wall, with the respective elliptical injection holes spatially staggered in the major and minor axis directions. This results in different spray flow distributions for the liquid fuel injected into the combustion chamber through each injection hole. Furthermore, the intersection of the injection lines from the injection holes increases the probability of collision of the atomized particles, thereby achieving re-fragmentation of the atomized particles, improving the atomization quality of the liquid fuel, reducing the difficulty of flare ignition, and enhancing the stability of the flame within the flare igniter combustion chamber.

[0013] Preferably, to facilitate simultaneous and regular control of the injection timing and angle of each nozzle assembly, when adjacent nozzle assemblies are rotated about the combustion chamber axis until the injection holes are coaxial, the angle between the major axes of the elliptical cross-section is 180° divided by the number of nozzle assemblies. To facilitate simultaneous control of multiple nozzle assemblies, the elliptical injection holes are spatially staggered in a regular pattern along their major and minor axes.

[0014] Preferably, to simplify the overall structure while ensuring effective atomization, two nozzle assemblies are provided, symmetrically arranged on either side of the combustion chamber's central axis. The centers of the two nozzle assemblies' injection holes are coaxial and the injection holes are positioned opposite each other. Using two oppositely positioned nozzle assemblies can simplify the overall structure and reduce manufacturing costs.

[0015] To further enhance the atomization quality of the liquid fuel, the elliptical cross-sections of the two nozzle assembly injection holes preferably have a major axis angle of 90°. Two nozzle assemblies are positioned on the combustion chamber wall, and the two elliptical injection holes are spatially arranged with their major and minor axes perpendicular to each other. This ensures that the spray flow field distribution of the liquid fuel injected into the combustion chamber through the two injection holes is perpendicular to each other. Furthermore, the two opposing injection holes increase the probability of collision between the atomized particles, thereby achieving re-fragmentation of the atomized particles, improving the atomization quality of the liquid fuel, reducing the difficulty of flare ignition, and enhancing the stability of the flame within the flare igniter combustion chamber.

[0016] The working process and principle of the present invention are as follows:

[0017] A torch igniter described in the present invention is installed on a combustion heater, air enters from the branch gas pipeline of the bubble atomizing nozzle, liquid fuel enters from the liquid fuel oil circuit, and then air flows out from the small holes on the wall of the branch gas pipeline to form bubbles, and the bubbles are mixed with the incoming liquid fuel in the gas-liquid mixing chamber, and the evenly mixed gas-liquid two-phase flow flows through the metal wire mesh, and the metal wire mesh divides the large bubbles into many uniform and stable small bubbles, and then the gas-liquid two-phase flow is sprayed into the combustion chamber through the elliptical injection through hole. Because the elliptical injection through holes of the two nozzles are spatially staggered in the long and short axis directions, the spray flow field distributions ejected simultaneously by the injection heads of each nozzle assembly are different. At the same time, multiple or two nozzle assemblies are symmetrically arranged along the wall of the combustion chamber, which increases the collision probability of the atomized particles, thereby achieving the re-breakage of the atomized particles, and further improving the spray quality of the atomized liquid fuel. The main oxidant enters the combustion chamber through the main oxidant inlet. The oxidant after entering will be fully mixed with the atomized liquid fuel. Then the fully mixed oxidant and atomized liquid fuel are ignited by the spark plug installed at the spark plug mounting seat, forming a stable high-temperature gas flame in the combustion chamber. The formed high-temperature gas flame is ejected from the flame injection port at the right end of the combustion chamber, and the ejected flame column will ignite the liquid fuel in the combustion heater.

[0018] Beneficial effects: The present invention has a simple overall structure by combining a bubble atomizing nozzle with a torch igniter. The uniform distribution of the nozzle assembly and the intersection of the extended lines of the nozzle assembly nozzle orifices can increase the collision probability of the atomized particles, thereby achieving the re-breakup of the atomized particles, improving the atomization quality of the liquid fuel, reducing the difficulty of torch ignition, and improving the stability of the flame in the combustion chamber of the torch igniter. In order to widen the ignition range of the torch igniter, the spark plug mounting seat is close to the flame nozzle side, the nozzle assembly is close to the main oxidant inlet side, and a plurality of spark plug bases are provided on the combustion chamber wall, so that the ignition position can be selected according to actual conditions. A through hole with an elliptical cross-section is used at the outlet of the injection through hole, and the advantages of the elliptical nozzle hole compared to the circular nozzle hole, such as a larger spray cone angle, a short jet breakup length, and a higher oil-gas mixing quality, are utilized, thereby improving the fuel atomization quality of the entire spray field and improving the stability of the flame in the combustion chamber of the torch igniter. A plurality of nozzle assemblies are arranged on the wall of the combustion chamber, and the respective elliptical injection holes are spatially staggered in the directions of the major and minor axes, which makes the spray flow field distribution of the liquid fuel sprayed into the combustion chamber through each injection hole different. At the same time, the intersection of the injection lines of the injection holes can increase the collision probability of the atomized particles, thereby achieving the re-breakage of the atomized particles, improving the atomization quality of the liquid fuel, reducing the difficulty of torch ignition, and improving the stability of the flame in the combustion chamber of the torch igniter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the nozzle assembly of the present invention;

[0022] Figure 3 Schematic diagram of the structure of the metal wire mesh of the present invention;

[0023] Figure 4 It is an enlarged view of the local structure of the nozzle assembly at the injection head of the present invention. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0026] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0027] Example 1

[0028] A torch igniter comprises an igniter body 1 and a nozzle assembly 2, wherein a hollow combustion chamber 11 is provided inside the igniter body 1, and the nozzle assembly 2 passes through the side wall of the igniter body 1 and is connected with the combustion chamber 11. The invention is characterized in that: a main oxidant inlet 12 and a flame injection port 13 are respectively provided at both ends of the igniter body 1, a spark plug mounting seat 14 is provided on the side wall of the igniter body 1, and the nozzle assembly 2 is located on the side wall between the main oxidant inlet 12 and the spark plug mounting seat 14; the number of the nozzle assemblies 2 is at least two and is evenly distributed on the side wall along the circumferential direction of the outer diameter of the igniter body 1, and the extension lines of the injection ports of the nozzle assemblies 2 intersect.

[0029] The present invention utilizes uniformly distributed nozzle assemblies 2, with the extended lines of the nozzles intersecting to increase the probability of collision between atomized particles. This results in re-fragmentation of the atomized particles, improving the atomization quality of the liquid fuel, reducing the difficulty of flare ignition, and enhancing the flame stability within the flare igniter's combustion chamber. To broaden the flare igniter's ignition range, the spark plug mounting base is positioned near the flame injection port, the nozzle assembly is positioned near the main oxidant inlet, and multiple spark plug bases are positioned on the combustion chamber wall, allowing for selection of ignition positions based on actual conditions.

[0030] Example 2

[0031] like Figure 1 and 2 As shown, a torch igniter includes an igniter body 1 and a nozzle assembly 2, wherein a hollow combustion chamber 11 is provided inside the igniter body 1, and the nozzle assembly 2 passes through the side wall of the igniter body 1 and is connected with the combustion chamber 11, and is characterized in that: a main oxidant inlet 12 and a flame injection port 13 are respectively provided at both ends of the igniter body 1, a spark plug mounting seat 14 is provided on the side wall of the igniter body 1, and the nozzle assembly 2 is located on the side wall between the main oxidant inlet 12 and the spark plug mounting seat 14; the number of the nozzle assemblies 2 is more than two and is evenly distributed on the side wall along the circumferential direction of the outer diameter of the igniter body 1, and the extension lines of the injection ports of the nozzle assemblies 2 intersect.

[0032] To further improve the atomization quality of the liquid fuel, the nozzle assembly 2 is a bubble atomizing nozzle, comprising a nozzle body 21 and an injection head 22. The injection head 22 is mounted at the injection end of the nozzle body 21. A liquid fuel oil circuit 23, a branch gas line 24, and a gas-liquid mixing chamber 25 are provided within the nozzle body 21. The liquid fuel oil circuit 23 and the branch gas line 24 are respectively connected to the gas-liquid mixing chamber 25. An injection through-hole 221 is provided at the center of the injection head 22. The inlet of the injection through-hole 221 is connected to the gas-liquid mixing chamber 25, and the outlet of the injection through-hole 221 is connected to the combustion chamber 11. By combining the bubble atomizing nozzle with the torch igniter, and utilizing the bubble atomizing nozzle's excellent atomization quality under low-pressure conditions, the atomization quality of the liquid fuel in the combustion chamber is thereby improved.

[0033] To further enhance the atomization quality of the liquid fuel, the outlet of the injection through-hole 221 has an elliptical cross-section. This elliptical cross-section at the outlet of the injection through-hole 221 leverages the advantages of an elliptical nozzle hole over a circular nozzle hole, such as a larger spray cone angle, shorter jet breakup length, and higher oil-gas mixing quality. This improves the fuel atomization quality of the entire spray field and enhances the flame stability within the flare igniter combustion chamber.

[0034] like Figure 4 As shown, in order to increase the injection speed of the atomized fuel, the inlet of the injection through hole 221 is a funnel-shaped structure expanding toward the gas-liquid mixing chamber 25, and the bottom end of the funnel-shaped structure is smoothly connected to the top end of the through hole of the elliptical structure.

[0035] like Figure 3 As shown, to further improve the atomization quality of the liquid fuel, a wire mesh 26 is provided between the gas-liquid mixing chamber 25 and the injection head 22. The wire mesh 26 can effectively divide the large bubbles in the gas-liquid mixing chamber 25 into a number of uniform and stable small bubbles, thereby reducing the average diameter of the atomized particles and improving the atomization quality of the liquid fuel.

[0036] To further enhance the atomization quality of the liquid fuel, the injection holes 221 are arranged in a staggered pattern, each with an elliptical cross-section. Multiple nozzle assemblies 2 are positioned on the wall of the combustion chamber 11, with each elliptical injection hole 221 spatially staggered in the major and minor axis directions. This results in a different distribution of the spray flow fields when the liquid fuel is injected into the combustion chamber 11 through each injection hole 221. Furthermore, the intersection of the injection paths of the injection holes 221 increases the probability of collision of the atomized particles, thereby re-fragmenting the atomized particles, improving the atomization quality of the liquid fuel, reducing the difficulty of flare ignition, and enhancing the stability of the flame within the flare igniter combustion chamber.

[0037] To facilitate simultaneous and regular control of the injection timing and angle of each nozzle assembly 2, when adjacent nozzle assemblies 2 are rotated about the axis of the combustion chamber 11 until their injection holes 221 are coaxial, the angle between the major axes of the elliptical cross-section is 180° divided by the number of nozzle assemblies 2. To facilitate simultaneous control of multiple nozzle assemblies 2, the elliptical injection holes 221 are spatially staggered in a regular pattern along their major and minor axes.

[0038] Example 3

[0039] like Figure 1 and 2 As shown, a torch igniter includes an igniter body 1 and a nozzle assembly 2, wherein a hollow combustion chamber 11 is provided inside the igniter body 1, and the nozzle assembly 2 passes through the side wall of the igniter body 1 and is connected with the combustion chamber 11, and is characterized in that: a main oxidant inlet 12 and a flame injection port 13 are respectively provided at both ends of the igniter body 1, a spark plug mounting seat 14 is provided on the side wall of the igniter body 1, and the nozzle assembly 2 is located on the side wall between the main oxidant inlet 12 and the spark plug mounting seat 14; the number of the nozzle assemblies 2 is two, which are evenly distributed on the side wall along the circumferential direction of the outer diameter of the igniter body 1, and the extension lines of the injection ports of the nozzle assemblies 2 intersect.

[0040] To further improve the atomization quality of the liquid fuel, the nozzle assembly 2 is a bubble atomizing nozzle, comprising a nozzle body 21 and an injection head 22. The injection head 22 is mounted at the injection end of the nozzle body 21. A liquid fuel oil circuit 23, a branch gas line 24, and a gas-liquid mixing chamber 25 are provided within the nozzle body 21. The liquid fuel oil circuit 23 and the branch gas line 24 are respectively connected to the gas-liquid mixing chamber 25. An injection through-hole 221 is provided at the center of the injection head 22. The inlet of the injection through-hole 221 is connected to the gas-liquid mixing chamber 25, and the outlet of the injection through-hole 221 is connected to the combustion chamber 11. By combining the bubble atomizing nozzle with the torch igniter, and utilizing the bubble atomizing nozzle's excellent atomization quality under low-pressure conditions, the atomization quality of the liquid fuel in the combustion chamber is thereby improved.

[0041] To further enhance the atomization quality of the liquid fuel, the outlet of the injection through-hole 221 has an elliptical cross-section. This elliptical cross-section at the outlet of the injection through-hole 221 leverages the advantages of an elliptical nozzle hole over a circular nozzle hole, such as a larger spray cone angle, shorter jet breakup length, and higher oil-gas mixing quality. This improves the fuel atomization quality of the entire spray field and enhances the flame stability within the flare igniter combustion chamber.

[0042] like Figure 4As shown, in order to increase the injection speed of the atomized fuel, the inlet of the injection through hole 221 is a funnel-shaped structure expanding toward the gas-liquid mixing chamber 25, and the bottom end of the funnel-shaped structure is smoothly connected to the top end of the through hole of the elliptical structure.

[0043] like Figure 3 As shown, to further improve the atomization quality of the liquid fuel, a wire mesh 26 is provided between the gas-liquid mixing chamber 25 and the injection head 22. The wire mesh 26 can effectively divide the large bubbles in the gas-liquid mixing chamber 25 into a number of uniform and stable small bubbles, thereby reducing the average diameter of the atomized particles and improving the atomization quality of the liquid fuel.

[0044] To simplify the overall structure while ensuring atomization, two nozzle assemblies 2 are provided. These two nozzle assemblies are symmetrically arranged on either side of the central axis of the combustion chamber 11. The centers of the injection holes 221 of the two nozzle assemblies are coaxial and the injection holes 221 are arranged opposite each other. The use of two oppositely arranged nozzle assemblies 2 can simplify the overall structure and reduce manufacturing costs.

[0045] To further enhance the atomization quality of the liquid fuel, the long-axis angle of the elliptical cross-section of the two nozzle assembly injection holes 221 is 90°. Two nozzle assemblies 2 are positioned on the wall of the combustion chamber 11, and the two elliptical injection holes 221 are spatially arranged with their major and minor axes perpendicular to each other. This ensures that the spray flow field distribution of the liquid fuel injected into the combustion chamber 11 through the two injection holes 221 is perpendicular to each other. Furthermore, the two opposing injection holes 221 increase the probability of collision of atomized particles, thereby achieving re-fragmentation of the atomized particles, improving the atomization quality of the liquid fuel, reducing the difficulty of flare ignition, and enhancing the stability of the flame within the flare igniter combustion chamber.

[0046] The working process and principle of the present invention are as follows:

[0047] A torch igniter described in the present invention is installed on a combustion heater, air enters from the branch gas pipeline 24 of the bubble atomizing nozzle, liquid fuel enters from the liquid fuel oil pipeline 23, and then air flows out from the small holes on the wall of the branch gas pipeline 24 to form bubbles, and the bubbles are mixed with the incoming liquid fuel in the gas-liquid mixing chamber 25, and the evenly mixed gas-liquid two-phase flow flows through the metal wire mesh 26, and the metal wire mesh 26 divides the large bubbles into many uniform and stable small bubbles, and then the gas-liquid two-phase flow is sprayed into the combustion chamber 11 through the elliptical injection through hole 221. Because the elliptical injection through holes 221 of the two nozzles are spatially staggered in the long and short axis directions, the spray flow field distributions ejected simultaneously by the injection heads 22 of each nozzle assembly 2 are different. At the same time, the two nozzle assemblies are symmetrically arranged along the wall of the combustion chamber 11, which increases the collision probability of the atomized particles, thereby achieving the re-breakage of the atomized particles, and further improving the spray quality of the atomized liquid fuel. The main oxidant enters the combustion chamber through the main oxidant inlet 12. The oxidant after entering will be fully mixed with the atomized liquid fuel. Then, the fully mixed oxidant and the atomized liquid fuel are ignited by the spark plug installed at the spark plug mounting seat 14, forming a stable high-temperature gas flame in the combustion chamber 11. The formed high-temperature gas flame is ejected from the flame injection port 13 at the right end of the combustion chamber, and the ejected flame column will ignite the liquid fuel in the combustion heater.

[0048] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0049] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A torch igniter, comprising an igniter body (1) and a nozzle assembly (2), wherein a hollow combustion chamber (11) is provided inside the igniter body (1), and the nozzle assembly (2) penetrates the side wall of the igniter body (1) and communicates with the combustion chamber (11), characterized in that: The igniter body (1) is provided with a main oxidant inlet (12) and a flame injection port (13) at both ends thereof, a spark plug mounting seat (14) is provided on the side wall of the igniter body (1), and the nozzle assembly (2) is located on the side wall between the main oxidant inlet (12) and the spark plug mounting seat (14); the number of the nozzle assemblies (2) is at least two and is evenly distributed on the side wall along the circumferential direction of the outer diameter of the igniter body (1), and the injection port extension lines of the nozzle assemblies (2) intersect; The nozzle assembly (2) is a bubble atomizing nozzle, comprising a nozzle body (21) and an injection head (22); a liquid fuel oil path (23), a branch gas pipeline (24), and a gas-liquid mixing chamber (25) are provided in the nozzle body (21); an injection through hole (221) is provided at the center of the injection through hole (221); and the cross section of the outlet of the injection through hole (221) is an elliptical through hole; A metal mesh (26) is provided between the gas-liquid mixing chamber (25) and the injection head (22); The injection through holes (221) have an elliptical cross-section and are staggered in the major and minor axis directions.

2. The torch igniter according to claim 1, characterized in that: The injection head (22) is mounted on the injection end of the nozzle body (21); the liquid fuel oil circuit (23) and the branch gas pipeline (24) are respectively connected to the gas-liquid mixing chamber (25); the inlet of the injection through hole (221) is connected to the gas-liquid mixing chamber (25); and the outlet of the injection through hole (221) is connected to the combustion chamber (11).

3. The torch igniter according to claim 1, characterized in that: The inlet of the injection through hole (221) is a funnel-shaped structure expanding toward one side of the gas-liquid mixing chamber (25), and the bottom end of the funnel-shaped structure is smoothly connected to the top end of the through hole of the elliptical structure.

4. The torch igniter according to claim 1, characterized in that: When the adjacent nozzle assemblies (2) are rotated around the axis of the combustion chamber (11) until the injection through holes (221) are coaxial, the major axis angle of the elliptical structural cross section is 180° divided by the number of nozzle assemblies (2).

5. The torch igniter according to claim 2 or 4, characterized in that: The number of the nozzle assemblies (2) is two, and the two nozzle assemblies are symmetrically arranged on both sides of the central axis of the combustion chamber (11). The centers of the injection holes (221) of the two nozzle assemblies are coaxial, and the injection holes (221) are arranged opposite to each other.

6. The torch igniter according to claim 5, characterized in that: The major axis included angle of the elliptical structural cross section of the two nozzle assembly injection through holes (221) is 90°.

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