A gas injector

Abstract

This invention relates to the field of automotive powertrain technology, specifically disclosing a gas injector. A valve core and a sealing seat are spaced apart along a first direction to form a first cavity, and a valve seat and valve core are spaced apart along the first direction to form a second cavity. The valve core has a flow-limiting channel connecting the first and second cavities. A flow-limiting portion protrudes from the valve seat. The valve core is slidably disposed on the inner wall of the housing, thereby changing the flow area between the flow-limiting portion and the inner wall of the flow-limiting channel. When the intake air volume increases, a pressure difference is created between the first and second cavities. The valve core moves along a second direction, reducing the flow area between the valve core and the flow-limiting portion, thus reducing the amount of gas flowing and controlling the ejection volume of the gas injector. Simultaneously, when a gas flow occurs directly, the valve core, under the impact of a large force, will sit on the valve seat, and the flow-limiting portion will close the flow-limiting channel, blocking gas flow and ultimately achieving the functions of flow limitation and safety protection.

Description

Technical Field

[0001] This invention relates to the field of automotive power unit technology, and more particularly to a gas injector. Background Technology

[0002] The automotive industry is increasingly using clean gaseous fuels such as natural gas or hydrogen. Gas injectors, also known as gas fuel injectors, are one of the core components of gas fuel systems. They enable the injection of fuel into the engine in a timed and quantitative manner, and their injection performance has a very important impact on engine performance.

[0003] Gas injectors are primarily designed for maximum jet volume based on engine power. If the engine's jet volume requirements vary significantly, the gas injector must be designed according to the maximum jet volume. However, during gas injector operation, collisions between moving parts are unavoidable. Furthermore, with prolonged operation, collisions between the armature and the core within the injector, as well as excessive wear on the internal sealing surfaces, can increase the armature lift, causing the maximum jet volume to far exceed the engine's power requirements. Moreover, with further increases in operating time, the maximum jet volume will become even greater, potentially leading to complete injector failure and impacting engine performance. Summary of the Invention

[0004] The purpose of this invention is to provide a gas injector to solve the problem that the excessive amount of gas ejected by existing gas injectors causes the gas injector to fail and affects engine performance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a gas ejector, comprising:

[0007] The housing has an air intake channel that penetrates through it;

[0008] A sealing seat, wherein the sealing seat is provided with a first channel communicating with the air intake channel and is fixedly connected to the inner wall of the air intake channel;

[0009] The armature has a second channel communicating with the air intake channel, and the armature is slidably disposed on the inner wall of the air intake channel so as to open or close the first channel;

[0010] The first elastic element is configured to drive the armature to always have a tendency to move toward the position that closes the first channel;

[0011] An electromagnet assembly is configured to drive the armature to move in order to open the first channel;

[0012] A needle valve assembly includes a valve body and a needle valve. The valve body has an outlet channel, and the needle valve is disposed within the outlet channel and is capable of opening or closing the outlet channel. The valve body is fixedly connected to the housing and is located downstream in the gas flow direction. The gas injector also includes a flow limiting component, which includes:

[0013] A valve core and a sealing seat are spaced apart along a first direction to form a first cavity, and the first cavity is connected to the first channel;

[0014] A valve seat is disposed between the valve body and the housing, and is spaced apart from the valve core along the first direction to form a second cavity, the second cavity being connected to the air outlet passage;

[0015] The valve core is provided with a flow-limiting channel, which connects the first cavity and the second cavity. The valve seat is provided with a flow-limiting part. The valve core is slidably disposed on the inner wall of the housing, thereby changing the flow area between the flow-limiting part and the inner wall of the flow-limiting channel.

[0016] The second elastic element is configured to drive the valve core to always tend to move toward the position where the flow-limiting channel is opened.

[0017] As a preferred technical solution for the aforementioned gas injector, the inner diameter of the flow-limiting channel gradually increases along the second direction, which is the gas flow direction, and the first direction is opposite to the second direction.

[0018] As a preferred embodiment of the above-mentioned gas injector, the gas injector further includes a first adjusting shim, which is disposed between the valve seat and the housing.

[0019] As a preferred technical solution of the above-mentioned gas injector, the valve core is slidably disposed on the inner wall of the air intake channel, the valve core is provided with a first protrusion, and the inner wall of the air intake channel is provided with a first boss, the first protrusion being able to abut against the first boss along the first direction.

[0020] As a preferred embodiment of the aforementioned gas injector, the needle valve assembly further includes a third elastic element, which is configured to drive the needle valve to open or close the gas outlet passage.

[0021] As a preferred embodiment of the aforementioned gas injector, the electromagnet assembly includes a coil and an iron core disposed within the air intake channel. The coil is connected to the housing and arranged around the iron core. The iron core is configured to drive the armature to move along a first direction when the coil is energized.

[0022] As a preferred technical solution of the above-mentioned gas injector, the inner wall of the air intake channel is provided with a second protrusion, the iron core is provided with a second protrusion, the second protrusion abuts against the second protrusion, and the iron core is provided with a third channel, which is connected to the air intake channel.

[0023] As a preferred technical solution of the above-mentioned gas injector, the gas injector further includes a connector, which is connected to the inner wall of the air inlet channel, and the connector has a fourth channel inside, which communicates with the third channel, and the connector abuts against the iron core.

[0024] As a preferred embodiment of the gas injector, the gas injector further includes a second adjusting shim, which is disposed between the second boss and the second protrusion.

[0025] As a preferred embodiment of the above-mentioned gas injector, the gas injector further includes a sealing gasket, which is disposed between the armature and the sealing seat.

[0026] The beneficial effects of this invention are as follows:

[0027] This invention provides a gas injector, comprising: a housing, a sealing seat, an armature, a first elastic element, an electromagnet assembly, a needle valve assembly, and a flow-limiting assembly. The housing has an air inlet channel penetrating the housing. The sealing seat has a first channel communicating with the air inlet channel and is fixedly connected to the inner wall of the air inlet channel. The armature has a second channel communicating with the air inlet channel, and the armature is slidably disposed on the inner wall of the air inlet channel to open or close the first channel. The first elastic element is configured to drive the armature to always have a tendency to move towards a position closing the first channel. The electromagnet assembly is configured to drive the armature to move to open the first channel. The needle valve assembly includes a valve body and a needle valve. The valve body has an air outlet channel, and the needle valve is disposed within the air outlet channel. The valve body is fixedly connected to the housing and located downstream of the gas flow direction. The flow-limiting component includes a valve core, a valve seat, and a second elastic element. The valve core and the sealing seat are spaced apart along a first direction to form a first cavity, which is connected to a first channel. The valve seat is located between the valve body and the housing and is spaced apart from the valve core along the first direction to form a second cavity, which is connected to the gas outlet channel. The valve core is provided with a flow-limiting channel, which connects the first cavity and the second cavity. The valve seat has a protruding flow-limiting part. The valve core is slidably disposed on the inner wall of the housing, thereby changing the flow area between the flow-limiting part and the inner wall of the flow-limiting channel. The second elastic element is configured to drive the valve core to always have a tendency to move towards the position of opening the flow-limiting channel. With this configuration, when the gas injector is not working, the electromagnet assembly is in the closed state, and the armature will fall back onto the sealing seat under the preload of the first elastic element and the intake pressure to seal the first channel. When the gas injector is working normally, the electromagnet assembly will generate electromagnetic force and overcome the preload of the first elastic element, causing the armature to move in the first direction. At this time, the armature moves away from the sealing seat, and the sealing surface between the armature and the sealing seat is opened, that is, the first channel is opened. The gaseous fuel flows through the sealing surface, sequentially through the first channel, the first cavity, the flow-limiting channel and the second cavity, and finally completes the jetting through the exhaust channel.

[0028] At this time, because the preload of the second elastic element is balanced with the air pressure of the first cavity and the second cavity, the valve core remains stationary. However, when the gas injector works for a long time, the armature will inevitably collide. At the same time, when the armature falls back, there will be hard contact between the armature and the sealing seat. Over time, the collision wear will become more serious. This will further increase the armature stroke to a certain extent, and the flow area between the armature and the sealing seat will increase, resulting in a larger air intake and thus a larger gas jet volume of the gas injector.

[0029] At this point, the flow-limiting component begins to function. When the intake air volume increases, due to the pressure difference between the first and second cavities and the action of the second elastic element, the valve core will move in the second direction, reducing the flow area between the valve core and the flow-limiting part. This reduces the amount of gas flowing between the flow-limiting part and the valve core, and the increased intake air volume at the top will not increase the amount of gas injected. This effectively controls the amount of gas injected into the engine by the gas injector. Furthermore, if the electromagnet assembly fails or other reasons prevent the sealing surface between the armature and the gasket from sealing, allowing gas fuel to flow directly, the valve core will sit on the valve seat under the impact of the large force of the gas fuel. The flow-limiting part will close the flow-limiting channel, thereby blocking the flow of gas fuel and ultimately playing the role of flow limitation and safety protection. Attached Figure Description

[0030] Figure 1 A cross-sectional view of the gas injector provided by the present invention;

[0031] Figure 2 This is a partial cross-sectional view of the gas injector provided by the present invention.

[0032] in:

[0033] 1. Housing; 101. Air intake passage;

[0034] 2. Sealing seat; 201. First channel;

[0035] 3. Armature; 301. Second passage;

[0036] 4. First elastic element;

[0037] 5. Electromagnet assembly; 51. Iron core; 511. Third channel; 52. Coil;

[0038] 6. Needle valve assembly; 61. Valve body; 62. Needle valve; 63. Third elastic element; 601. Air outlet passage;

[0039] 7. Flow limiting component; 71. Valve core; 711. Flow limiting channel; 712. First protrusion; 72. Valve seat; 73. Second elastic element;

[0040] 8. First cavity; 9. Second cavity; 10. Flow limiting part; 11. Fastener; 12. First adjusting shim; 13. First boss;

[0041] 14. Connector; 141. Fourth channel;

[0042] 15. Second adjusting shim; 16. Sealing gasket. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0044] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0045] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0046] Unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0048] like Figures 1 to 2As shown, this embodiment provides a gas injector, which includes: a housing 1, a sealing seat 2, an armature 3, a first elastic element 4, an electromagnet assembly 5, a needle valve assembly 6, and a flow limiting assembly 7. The housing 1 has an air inlet channel 101 penetrating the housing 1. The sealing seat 2 has a first channel 201 communicating with the air inlet channel 101 and is fixedly connected to the inner wall of the air inlet channel 101. The armature 3 has a second channel 301 communicating with the air inlet channel 101, and the armature 3 is slidably disposed on the inner wall of the air inlet channel 101 to open or close the first channel 201. The first elastic element 4 is configured to drive the armature 3 to always have a tendency to move towards the position of closing the first channel 201. The electromagnet assembly 5 is configured to drive the armature 3 to move to open the first channel 201. The needle valve assembly 6 includes a valve body 61 and a needle valve 62. The valve body 61 has an air outlet channel 601, and the needle valve 62 is disposed in the air outlet channel 601. The valve body 61 is fixedly connected to the housing 1 and is located downstream of the gas flow direction. The flow limiting component 7 includes a valve core 71, a valve seat 72 and a second elastic member 73. The valve core 71 and the sealing seat 2 are spaced apart along the first direction to form a first cavity 8. The first cavity 8 is connected to the first channel 201. The valve seat 72 is disposed between the valve body 61 and the housing 1, and is spaced apart from the valve core 71 along the first direction to form a second cavity 9. The second cavity 9 is connected to the gas outlet channel 601. The valve core 71 is provided with a flow limiting channel 711, which connects the first cavity 8 and the second cavity 9. The valve seat 72 is provided with a flow limiting part 10 protruding on it. The valve core 71 is slidably disposed on the inner wall of the housing 1, thereby changing the flow area between the flow limiting part 10 and the inner wall of the flow limiting channel 711. The second elastic member 73 is configured to drive the valve core 71 to always have a tendency to move toward the position of opening the flow limiting channel 711. With this configuration, when the gas injector is not working, the electromagnet assembly 5 is in the closed state, and the armature 3 will fall back onto the sealing seat 2 under the preload of the first elastic element 4 and the air intake pressure to seal the first channel 201. When the gas injector is working normally, the electromagnet assembly 5 will generate electromagnetic force and overcome the preload of the first elastic element 4, causing the armature 3 to move in the first direction. At this time, the armature 3 moves away from the sealing seat 2, and the sealing surface between the armature 3 and the sealing seat 2 is opened, that is, the first channel 201 is opened. The gaseous fuel passes through the sealing surface and flows sequentially through the first channel 201, the first cavity 8, the flow restriction channel 711 and the second cavity 9, and finally completes the jetting through the exhaust channel 601.

[0049] At this time, because the preload of the second elastic element 73 is balanced with the air pressure of the first cavity 8 and the second cavity 9, the valve core 71 remains stationary. However, when the gas injector works for a long time, the armature 3 will inevitably collide. At the same time, when the armature 3 falls back, there will be hard contact between the armature 3 and the sealing seat 2. Over time, the collision wear will become more serious, which will further increase the stroke of the armature 3 to a certain extent. The flow area between the armature 3 and the sealing seat 2 will increase, resulting in a larger air intake and thus a larger gas jet volume of the gas injector.

[0050] At this time, the flow limiting component 7 begins to function. When the intake air volume increases, due to the pressure difference between the first cavity 8 and the second cavity 9 and the action of the second elastic element 73, the valve core 71 will move in the second direction, reducing the flow area between the valve core 71 and the flow limiting part 10. This reduces the amount of gas flowing between the flow limiting part 10 and the valve core 71, and the amount of gas injected will not increase due to the increased intake air volume at the upper end. This effectively controls the amount of gas injected into the engine by the gas injector. Furthermore, when the electromagnet component 5 fails or other reasons cause the sealing surface between the armature 3 and the sealing gasket 16 to fail to seal, allowing the gas fuel to flow directly, the valve core 71 will sit on the valve seat 72 under the impact of the large force of the gas fuel. The flow limiting part 10 will close the flow limiting channel 711, thereby blocking the flow of gas fuel and ultimately playing the role of flow limiting and safety protection.

[0051] In this embodiment, the second elastic element 73 extends and retracts along the first direction, and its two ends respectively abut against the valve seat 72 and the valve core 71. The valve seat 72 is provided with a plurality of vent holes, which connect the second cavity 9 and the air outlet channel 601. Specifically, both the first elastic element 4 and the second elastic element 73 are compression springs.

[0052] Optionally, the inner diameter of the flow-limiting channel 711 gradually increases along the second direction, which is the gas flow direction, while the first direction is opposite to the second direction. This arrangement ensures that the cross-sectional area of ​​the valve core 71 near the first cavity 8 is larger than the cross-sectional area of ​​the valve core 71 away from the first cavity 8. This makes it easier to create a pressure difference between the first cavity 8 and the second cavity 9, making it easier to overcome the preload of the second elastic element 73. When the air intake increases, it is also easier to adjust the flow area between the valve core 71 and the flow-limiting part 10, thereby controlling the amount of gas ejected. It should be noted that the first direction and the second direction are respectively as follows... Figure 1 The two arrows in the image indicate the direction.

[0053] In this embodiment, the flow-limiting part 10 is at least partially located within the flow-limiting channel 711, and a conical flow area is formed between the flow-limiting part 10 and the inner wall of the flow-limiting channel 711. Of course, in other embodiments, a spherical flow area may also be formed between the flow-limiting part 10 and the inner wall of the flow-limiting channel 711.

[0054] Optionally, in order to adjust the lift of the valve core 71, the gas injector further includes a first adjusting shim 12, which is disposed between the valve seat 72 and the housing 1. The lift of the valve core 71 can be adjusted by adjusting the thickness of the first adjusting shim 12.

[0055] Optionally, the valve core 71 is slidably disposed on the inner wall of the air intake channel 101. The valve core 71 is provided with a first protrusion 712, and the inner wall of the air intake channel 101 is provided with a first boss 13. The first protrusion 712 can abut against the first boss 13 in a first direction. This arrangement can limit the valve core 71 in the first direction and prevent the valve core 71 from sticking to the sealing seat 2 under the pre-tightening force of the second elastic member 73.

[0056] Optionally, the needle valve assembly 6 further includes a third elastic element 63, which is configured to drive the needle valve 62 to open or close the outlet passage 601. In this embodiment, the needle valve 62 has a first abutment surface, and the valve body 61 has a second abutment surface. With this configuration, before the gaseous fuel flows into the outlet passage 601, under the pre-tightening force of the third elastic element 63, the first abutment surface of the needle valve 62 is always in contact with the second abutment surface of the valve body 61, thereby achieving a seal; when the gaseous fuel flows into the outlet passage 601, it acts on the head of the needle valve 62 and the first abutment surface, using gas pressure to overcome the pre-tightening force of the third elastic element 63, thereby pushing the needle valve 62 to move in the second direction, ultimately causing the first abutment surface to separate from the second abutment surface, thus completing the gas ejection.

[0057] In this embodiment, the valve body 61 is fixedly sleeved on the outer wall of the housing 1, and a locking nut is threaded onto the needle valve 62. The third elastic element 63 abuts against the locking nut and the valve body 61. Of course, in other embodiments, the needle valve 62 may also have a third protrusion, and the third elastic element 63 abuts against the third protrusion and the valve body 61. Specifically, the third elastic element 63 is a compression spring.

[0058] Optionally, the gas injector also includes a fastener 11, which is simultaneously fixed to the valve body 61 and the coil 52.

[0059] Optionally, the electromagnet assembly 5 includes a coil 52 and an iron core 51 disposed within the air intake channel 101. The coil 52 is connected to the housing 1 and is disposed around the iron core 51. The iron core 51 is configured to drive the armature 3 to move along a first direction when the coil 52 is energized. It should be noted that when the coil 52 is energized, the iron core 51 generates an electromagnetic force to drive the armature 3 to move along the first direction. A collision occurs between the armature 3 and the iron core 51, and the distance between them is the lift of the armature 3.

[0060] In this embodiment, the first elastic member 4 extends and retracts along the first direction, and its two ends respectively abut against the iron core 51 and the armature 3.

[0061] Optionally, the inner wall of the air intake channel 101 is provided with a second protrusion, and the iron core 51 is provided with a second protrusion abutting against the second protrusion. The iron core 51 is provided with a third channel 511, which communicates with the air intake channel 101. In this embodiment, the second protrusion abuts against the second protrusion along a second direction.

[0062] Optionally, the gas injector also includes a connector 14, which is connected to the inner wall of the air intake channel 101. The connector 14 has a fourth channel 141 inside, which connects to the third channel 511. The connector 14 abuts against the iron core 51. This configuration allows the connector 14 to more easily receive gaseous fuel, which is then transported into the air intake channel 101 via the fourth channel 141. Simultaneously, the connector 14 abutting against the iron core 51 further presses the iron core 51 along the second direction against the second protrusion, preventing it from shifting. In this embodiment, to facilitate the installation and removal of the connector 14, the outer surface of the connector 14 is provided with a first thread, and the inner surface of the air intake channel 101 is provided with a second thread that mates with the first thread. The connector 14 is threadedly connected to the housing 1. Of course, in other embodiments, the connector 14 can also be fixedly connected to the inner wall of the air intake channel 101.

[0063] Optionally, to adjust the lift of the armature 3, the gas injector further includes a second adjusting shim 15, which is disposed between the second boss and the second protrusion. With this configuration, the lift of the armature 3 can be adjusted by adjusting the thickness of the second adjusting shim 15.

[0064] Optionally, the gas injector also includes a sealing gasket 16 disposed between the armature 3 and the sealing seat 2.

[0065] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A gas ejector, comprising: The housing (1) is provided with an air intake channel (101) that penetrates the housing (1). Sealing seat (2), the sealing seat (2) is provided with a first channel (201) communicating with the air intake channel (101), and is fixedly connected to the inner wall of the air intake channel (101); The armature (3) is provided with a second channel (301) communicating with the air intake channel (101), and the armature (3) is slidably disposed on the inner wall of the air intake channel (101) so as to open or close the first channel (201); The first elastic element (4) is configured to drive the armature (3) to always have a tendency to move toward the position that closes the first channel (201); The electromagnet assembly (5) is configured to drive the armature (3) to move in order to open the first channel (201). A needle valve assembly (6) includes a valve body (61) and a needle valve (62). The valve body (61) has an outlet passage (601). The needle valve (62) is disposed within the outlet passage (601) and is capable of opening or closing the outlet passage (601). The valve body (61) is fixedly connected to the housing (1) and is located downstream in the gas flow direction. The gas injector further includes a flow-limiting assembly (7), which includes: A valve core (71) is provided at a distance from the sealing seat (2) along a first direction to form a first cavity (8), and the first cavity (8) is connected to the first channel (201); the first direction is the opposite direction to the gas flow direction; Valve seat (72), the valve seat (72) is disposed between the valve body (61) and the housing (1), and is spaced apart from the valve core (71) along the first direction to form a second cavity (9), the second cavity (9) is connected to the air outlet channel (601). The valve core (71) is provided with a flow limiting channel (711), which connects the first cavity (8) and the second cavity (9). The valve seat (72) is provided with a flow limiting part (10). The valve core (71) is slidably disposed on the inner wall of the housing (1), thereby changing the flow area between the flow limiting part (10) and the inner wall of the flow limiting channel (711). The second elastic element (73) is configured to drive the valve core (71) to always have a tendency to move toward the position of opening the flow restriction channel (711).

2. The gas injector of claim 1, wherein The inner diameter of the flow-limiting channel (711) gradually increases along the second direction, which is the gas flow direction, and the first direction is opposite to the second direction.

3. The gas injector of claim 1, wherein The gas injector also includes a first adjusting shim (12), which is disposed between the valve seat (72) and the housing (1).

4. The gas injector of claim 1, wherein The valve core (71) is slidably disposed on the inner wall of the air intake channel (101). The valve core (71) is provided with a first protrusion (712). The inner wall of the air intake channel (101) is provided with a first boss (13). The first protrusion (712) can abut against the first boss (13) along the first direction.

5. The gas injector of claim 1, wherein The needle valve assembly (6) further includes a third elastic element (63) configured to drive the needle valve (62) to open or close the air outlet passage (601).

6. The gas injector of claim 1, wherein The electromagnet assembly (5) includes a coil (52) and an iron core (51) disposed in the air intake channel (101). The coil (52) is connected to the housing (1) and disposed around the iron core (51). The iron core (51) is configured to drive the armature (3) to move in a first direction when the coil (52) is energized.

7. The gas injector of claim 6, wherein The inner wall of the air intake channel (101) is provided with a second protrusion, and the iron core (51) is provided with a second protrusion. The second protrusion abuts against the second protrusion. The iron core (51) is provided with a third channel (511) inside, and the third channel (511) is connected to the air intake channel (101).

8. The gas injector according to claim 7, characterized in that, The gas injector also includes a connector (14), which is connected to the inner wall of the air intake channel (101), and the connector (14) has a fourth channel (141) inside, which is connected to the third channel (511), and the connector (14) abuts against the iron core (51).

9. The gas injector of claim 7, wherein, The gas injector also includes a second adjusting shim (15), which is disposed between the second boss and the second protrusion.

10. The gas injector according to any one of claims 1 to 9, characterized in that The gas injector also includes a sealing gasket (16), which is disposed between the armature (3) and the sealing seat (2).

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