Gas fuel injectors

Abstract

The present application relates to a gas fuel injector, which includes a shell, a drive assembly and an actuator assembly. The shell includes an air inlet, an air outlet and a first accommodating chamber that are interconnected. The actuator assembly is arranged in the accommodating chamber. The actuator assembly includes a first actuator and a second actuator. The first actuator is closer to the air inlet than the second actuator. The drive assembly is used to drive at least one of the first actuator and the second actuator to move along a first axis. The first actuator is provided with a flow hole and a flow groove that is not interconnected with the flow hole. The flow hole and the flow groove are configured to be able to communicate with the first accommodating chamber. The movement of the first actuator and the second actuator can be controlled by adjusting the driving condition of the drive assembly. The flow hole and the flow groove are arranged so that the size of the gas flow cross section can be switched when the first actuator moves to different positions, thereby achieving the matching of large and small gas flow rates, which can meet the requirements of precise control of the jet volume and stable injection in the entire flow basin.

Description

Technical Field

[0001] The present application relates to the technical field of engine fuel injection, and in particular to a gas fuel injector. Background Art

[0002] Energy technology development has also shifted from traditional fossil fuels to clean fuels. As the core component of the engine fuel supply system, the injector has also shifted from liquid fuel injectors to gas fuel injectors. Gas fuel injectors can achieve the function of injecting fuel into the engine at a fixed time and in a fixed quantity. Of course, its injection performance has a very important impact on engine performance.

[0003] In the related art, the gas fuel injector is mainly designed for the maximum injection volume according to the engine power. For example, when the engine has a large span of injection volume requirements, the injector needs to be designed according to the maximum injection volume. However, when the engine is idling, the injection volume requirements are small, and at this time, the power-on time of the injector needs to be reduced. The gas injector in the traditional technology has the problem of not being able to accurately control the injection volume. Therefore, how to meet the requirements of accurate control and stable injection of the injection volume of the entire flow range on the same established injector is a technical problem that technicians in this field need to solve. Summary of the invention

[0004] Based on this, it is necessary to provide a gas fuel injector to address the problem that the gas injector cannot accurately control the injection amount.

[0005] The present application provides a gas fuel injector, which comprises: a housing, a driving assembly and an actuator assembly, the housing comprising an air inlet, an air outlet and a first accommodating chamber which are interconnected, the first accommodating chamber extending along a first axis and being located between the air inlet and the air outlet; the driving assembly is arranged in the housing; the actuator assembly is arranged in the accommodating chamber, the actuator assembly comprises a first actuator and a second actuator, the first actuator is closer to the air inlet than the second actuator, the driving assembly is used to drive at least one of the first actuator and the second actuator to move along the first axis, the first actuator is provided with a flow hole and a flow groove which is not interconnected with the flow hole, the flow hole and the flow groove are both configured to be able to communicate with the first accommodating chamber; Among them, the injector includes a first operating condition, a second operating condition and a third operating condition. In the first operating condition, one end of the second actuator close to the air inlet is against the first actuator, so that the flow hole is not connected to the first accommodating chamber; in the second operating condition, the second actuator can move along the first axis in the direction away from the first actuator under the action of the driving component, so that the flow hole is connected to the first accommodating chamber; in the third operating condition, the second actuator can move along the first axis in the direction away from the first actuator under the action of the driving component, and at the same time, the first actuator can move along the first axis in the direction away from the second actuator under the action of the driving component, so that the flow hole and the flow groove are both connected to the first accommodating chamber.

[0006] In one embodiment, the flow groove is disposed at the periphery of the flow hole.

[0007] In one embodiment, the shell includes a first shell portion, the first shell portion is provided with a second accommodating chamber connected to the air inlet and a first through hole connected to the second accommodating chamber, a step surface is formed between the first accommodating chamber and the first through hole, the first actuator is accommodated in the second accommodating chamber and is configured to be able to abut against the step surface, the step surface is arranged corresponding to the circulation groove, the first through hole is connected to the circulation hole, and the second actuator is used to separate or connect the first accommodating chamber and the first through hole.

[0008] In one embodiment, the actuator further includes a first limit member and a first elastic member, the first limit member is disposed at the air inlet, and the first elastic member abuts between the first limit member and the first actuator to enable the first actuator to abut against the step surface.

[0009] In one embodiment, the actuator assembly further includes an adjusting member, which is disposed between the first limiting member and the first shell portion and is used to adjust the axial stroke of the first actuator.

[0010] In one of the embodiments, the first limiting member is provided with a second through hole, and the second through hole is used to connect the air inlet and the flow hole.

[0011] In one embodiment, the shell includes a second shell portion and a third shell portion connected to each other, a first accommodating chamber is formed in the second shell portion, an air outlet is formed in the third shell portion, a third accommodating chamber is arranged between the second shell portion and the third shell portion, the second actuator at least partially extends to the third accommodating chamber along the first axis, and the second actuator is provided with a channel for connecting the first accommodating chamber and the third accommodating chamber.

[0012] In one embodiment, the second actuator includes a sliding sleeve, the second shell portion is sleeved on the sliding sleeve, and the channel is disposed on the sliding sleeve.

[0013] In one embodiment, the actuator assembly further includes a second limit member and a second elastic member, the second limit member is connected to the second shell portion, the second elastic member is sleeved on the sliding sleeve and abuts between the second limit member and the sliding sleeve, and the second elastic member is used to move the sliding sleeve toward the direction close to the first actuator.

[0014] In one embodiment, the actuator further includes a third actuator, which is disposed at one end of the second actuator close to the air outlet and is configured to open or seal the air outlet under the action of the second actuator.

[0015] In the above-mentioned gas fuel injector, the movement of the first actuator and the second actuator can be controlled by adjusting the driving condition of the driving assembly, wherein, by setting the flow holes and the flow grooves, the size of the gas flow cross-section can be switched when the first actuator moves to different positions, thereby achieving the matching of large and small gas flow rates, which can meet the needs of precise control of the jet volume in the entire flow basin and stable injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a gas fuel injector in a first working condition according to an embodiment of the present application.

[0017] Figure 2 Schematic diagram of a flow channel in one embodiment of the present application.

[0018] Figure 3 This is a schematic diagram of a flow channel in another embodiment of the present application.

[0019] Figure 4 Schematic diagram of a gas fuel injector in a second working condition according to an embodiment of the present application.

[0020] Figure 5 Schematic diagram of a gas fuel injector in a third working condition in one embodiment of the present application.

[0021] The figures in the drawings are:

[0022] The first shell 11, the air inlet 111, the first through hole 112, the second accommodating chamber 113, the second shell 12, the first accommodating chamber 121, the third shell 13, the air outlet 131, the first sealing ring 14, the fixing cap 15, the second sealing ring 16, the third accommodating chamber 17, the first driving member 21, the second driving member 22, the first actuator 31, the circulation hole 311, the circulation groove 312, the second actuator 32, the armature 321, the sleeve 322, the first sealing surface 3221, the first opening 3222, the second opening 3223, the first limiting member 33, the second through hole 331, the first elastic member 34, the adjusting member 35, the second limiting member 36, the second elastic member 37, the third actuator 38, and the second sealing surface 381. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0024] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0025] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0029] The present application provides a gas fuel injector, which is arranged between an air supply system and an engine and is used for supplying gas fuel to the engine.

[0030] The gas fuel injector includes a shell, a drive assembly and an actuator. The shell is a shell that defines the appearance of the injector and is used to provide an installation position for the drive assembly and the actuator; the drive assembly and the actuator are both arranged in the shell, and the drive assembly is used to drive the actuator to move along a preset path; under the action of the drive assembly, the actuator can move to different positions, so that the injector can switch between the first working condition, the second working condition and the third working condition. Specifically, in the first working condition, the gas fuel injector does not spray gas; in the second working condition, the gas fuel injector realizes small flow gas control; in the third working condition, the gas fuel injector realizes large flow gas control. By adjusting the driving condition of the drive assembly to switch different working conditions, the flow demand of the entire flow range of the gas fuel injector can be met.

[0031] refer to Figure 1 As shown, the shell includes a first shell portion 11, a second shell portion 12, a third shell portion 13, an air inlet 111, an air outlet 131 and a first accommodating chamber 121. The first shell portion 11, the second shell portion 12 and the third shell portion 13 are connected in sequence, the air inlet 111 is formed in the first shell portion 11, the first accommodating chamber 121 is formed in the second shell portion 12, and the air outlet 131 is formed in the third shell portion 13. The air inlet 111, the air outlet 131 and the first accommodating chamber 121 are interconnected, the first accommodating chamber 121 is extended along the first axis and is located between the air inlet 111 and the air outlet 131. In the embodiment disclosed in the present application, taking the first axis parallel to the horizontal direction as an example, the air inlet 111 is upwards of the first accommodating chamber 121, and the air outlet 131 is downwards of the first accommodating chamber 121, and the gas flows from top to bottom.

[0032] The first shell 11 and the second shell 12 are clearance-fitted, and the first shell 11 and the second shell are sealed by a first sealing ring 14. A fixing cap 15 is also provided between the first shell 11 and the second shell 12, and the fixing cap 15 is used to press and fix the first shell 11 and the second shell 12. The second shell 12 and the third shell 13 are sealed by a second sealing ring 16.

[0033] The driving assembly includes a first driving member 21 and a second driving member 22, wherein the first driving member 21 is disposed between the first shell portion 11 and the second shell portion 12, and the second driving member 22 is disposed in the second shell portion 12. The actuator assembly includes a first actuator 31 and a second actuator 32, wherein the first actuator 31 is disposed in the first shell portion 11, and the second actuator 32 is disposed in the first accommodating chamber 121. The first driving member 21 is used to drive the first actuator 31 to move along the first axis, and the second driving member 22 is used to drive the second actuator 32 to move along the first axis. In the embodiment disclosed in the present application, the first driving member 21 and the second driving member 22 are both electromagnets, the first actuator 31 is an armature, and the second actuator 32 is at least partially an armature, and the armature can be driven to move by energizing the electromagnet. In the embodiment disclosed in the present application, by controlling the power supply of the first driving member 21 and the second driving member 22, at least one of the first actuator 31 and the second actuator 32 is driven to move. Specifically, in the first working condition, the first driving member 21 and the second driving member 22 are not powered; in the second working condition, the first driving member 21 is powered off and the second driving member 22 is powered on. In this working condition, only the second actuator 32 moves; in the third working condition, the first driving member 21 and the second driving member 22 are powered on at the same time. In this working condition, both the first actuator 31 and the second actuator 32 move. It can be understood that the driving component can also be provided with only one driving member in combination with the transmission component to drive at least one of the first actuator 31 and the second actuator 32 to move.

[0034] The first actuator 31 is closer to the air inlet 111 than the second actuator 32, and the first actuator 31 can adjust the flow cross section of the gas after entering the injector from the air inlet 111. Specifically, the first actuator 31 is provided with a flow hole 311 and a flow groove 312, the flow hole 311 and the flow groove 312 are not connected to each other, and the flow hole 311 and the flow groove 312 are configured to be connected to the first accommodating chamber 121. In the first operating condition, one end of the second actuator 32 close to the air inlet 111 abuts against the first actuator 31, so that the flow hole 311 is not connected to the first accommodating chamber 121; in the second operating condition, the second actuator 32 can move along the first axis in the direction away from the first actuator 31 (move to the left) under the action of the second actuator 32, so that the flow hole 311 is connected to the first accommodating chamber 121, and small flow gas control is achieved when the flow hole 311 is connected to the first accommodating chamber 121; in the third operating condition, the second actuator 32 can move along the first axis in the direction away from the first actuator 31 (move to the left) under the action of the second driving member 22, and at the same time, the first actuator 31 can move along the first axis in the direction away from the second actuator 32 (move to the right) under the action of the first driving member 21, so that the flow hole 311 and the flow groove 312 are both connected to the first accommodating chamber 121, and large flow gas control is achieved when the flow hole 311 and the flow groove 312 are both connected to the first accommodating chamber 121.

[0035] It can be understood that the diameter of the flow hole 311 is set according to the small air volume requirement of the engine, and the flow cross-section of the flow groove 312 is set according to the large air volume requirement of the engine.

[0036] refer to Figure 2 As shown, the first actuator 31 is penetrated along the first axis to form a flow hole 311 and a flow slot 312, the flow hole 311 is located at the center of the first actuator 31, and the flow slot 312 is located at the periphery of the flow hole 311. In the embodiment disclosed in the present application, a plurality of flow slots 312 are provided, and the flow slots 312 are distributed at intervals along the circumference of the first actuator 31, and the flow slots 312 are open at positions away from the flow hole 311.

[0037] Referring to FIG. 3 , in other embodiments, the flow slot 312 may also be a columnar hole.

[0038] In other embodiments, the circulation groove 312 can also be an annular groove. In this embodiment, the annular groove divides the first actuator 31 into two parts. Specifically, the circulation hole 311 is formed in the first part, and the annular groove is formed between the two parts. Of course, a connecting rod can be set in the middle to connect the two parts together to form the first actuator 31.

[0039] Reference again Figure 1As shown, the first shell 11 is provided with a first through hole 112 and a second accommodating cavity 113. The first through hole 112 is communicated with the second accommodating cavity 113, and the second accommodating cavity 113 is communicated with the air inlet 111. The first actuator 31 is accommodated in the second accommodating cavity 113, and the cavity wall of the second accommodating cavity 113 can guide the movement of the first actuator 31. At the same time, the circulation hole 311 can connect the air inlet 111 and the first through hole 112. A step surface is formed between the first accommodating cavity 121 and the first through hole 112, and the first actuator 31 can abut against the step surface. Specifically, when the first actuator 31 moves to the right, it is separated from the step surface. When the first actuator 31 moves to the left, it can move to abut against the step surface, and the step surface is arranged corresponding to the position of the circulation groove 312. In the second working condition, the first actuator 31 abuts against the step surface, and the step surface can seal the end of the flow groove 312 close to the gas outlet 131. At this time, the gas flows from the gas inlet 111, the flow hole 311, and the first through hole 112 to the first accommodating chamber 121; in the third working condition, the first actuator 31 is separated from the step surface. At this time, the gas flows from the gas inlet 111, the flow hole 311+the flow groove 312, and the first through hole 112 to the first accommodating chamber 121 in sequence. The flow hole 311 and the flow groove 312 simultaneously allow the gas to flow to the first accommodating chamber 121, thereby increasing the gas flow area and realizing large-flow gas control. The second working condition and the third working condition correspond to different positions of the first actuator 31. By switching the position of the first actuator 31, the flow groove 312 is selectively connected to the first through hole 112, realizing the switching of the large flow cross section and the small flow cross section of the gas.

[0040] The actuator assembly also includes a first limit member 33 and a first elastic member 34. The first limit member 33 is disposed at the air inlet 111, and the first elastic member 34 abuts between the first limit member 33 and the first actuator 31. In the second working condition, the first driving member 21 is powered off, and the first elastic member 34 can make the first actuator 31 abut against the step surface, so that the step surface can seal the end of the flow groove 312 away from the air inlet 111; in the third working condition, the first driving member 21 is powered on, and the first actuator 31, under the action of the first driving member 21, can overcome the elastic force of the first elastic member 34 and move toward the direction close to the air inlet 111.

[0041] The first stopper 33 is provided with a second through hole 331 , and the second through hole 331 is used to achieve communication between the air inlet 111 and the circulation hole 311 and the circulation groove 312 .

[0042] The actuator assembly also includes an adjusting member 35. A plane is formed between one end of the air inlet 111 close to the first actuator 31 and the second accommodating chamber 113. The first limit member 33 is pressed against the first shell 11 through the adjusting member 35 and the plane. By adjusting the thickness of the adjusting member 35, the axial stroke of the first actuator 31 can be adjusted, thereby adjusting the response time of the first actuator 31.

[0043] In the embodiment disclosed in the present application, the periphery of the first limit member 33 is connected to the inner wall of the first shell portion 11 via threads, and the first limit member 33 can be screwed in or out of the air inlet 111 via the threads. When the first limit member 33 is screwed in to a certain extent, the adjusting member 35 can be pressed onto the plane.

[0044] The second actuator 32 includes an armature 321 and a sleeve 322. The armature 321 is accommodated in the first accommodation cavity 121, and the second shell 12 is in clearance fit with the armature 321. The armature 321 can move along the first axis under the action of the second driving member 22. The armature 321 is fixedly sleeved on the sleeve 322 so that the sleeve 322 can move with the armature 321. One end of the sleeve 322 close to the air inlet 111 is a first sealing surface 3221, and the first sealing surface 3221 is used to seal or open the first through hole 112, so as to separate or connect the first accommodation cavity 121 and the first through hole 112.

[0045] The third shell 13 is at least partially disposed on the periphery of the second shell 12, and a third accommodating chamber 17 is disposed between the second shell 12 and the third shell 13. The second shell 12 is sleeved on the periphery of the sliding sleeve 322, and the second shell 12 can guide the movement of the sliding sleeve 322 along the first axis. The sliding sleeve 322 extends through the second shell 12 along the first axis to the third accommodating chamber 17, and the sliding sleeve 322 is provided with a channel for connecting the first accommodating chamber 121 and the third accommodating chamber 17. Specifically, the channel includes a first opening 3222 located in the first accommodating chamber 121 and a second opening 3223 located in the third accommodating chamber 17. After the gas enters the first accommodating chamber 121, it can flow to the third accommodating chamber 17 through the first opening 3222, the channel, and the second opening 3223.

[0046] The actuator assembly further includes a second stopper and a second elastic member 37. The second stopper is connected to the second shell 12, and a receiving space for receiving the second elastic member 37 is provided between the second shell 12 and the sliding sleeve 322. The second elastic member 37 is sleeved on the sliding sleeve 322 and abuts between the second stopper and the sliding sleeve 322. The second elastic member 37 is used to move the sliding sleeve 322 toward the direction close to the first actuator 31.

[0047] The actuator assembly also includes a third actuator 38. The third actuator 38 is accommodated in the third accommodating chamber 17 and is arranged at one end of the sliding sleeve 322 close to the air outlet 131. Under the action of the second actuator 32, the third actuator 38 can open or seal the air outlet 131. In the embodiment disclosed in the present application, the third actuator 38 is a needle valve, the third shell 13 is a needle valve shell, and a second sealing surface 381 is arranged at one end of the third actuator 38 close to the air outlet 131. The sealing or opening of the air outlet 131 is achieved by the fitting and separation of the second sealing surface 381 and the third shell 13.

[0048] The gas jet injector of the present application, such as Figure 1 In the first working condition, the first driving member 21 and the second driving member 22 are both powered off, one end of the sleeve 322 abuts against the first shell 11, the first sealing surface 3221 seals the first through hole 112, and the second sealing surface 381 seals the gas outlet 131, so that the gas cannot flow in the ejector. Figure 4 In the second working condition, the first driving member 21 is energized, and the armature 321 drives the sleeve 322 to move leftward along the first axis under the action of the first driving member 21, and the sleeve 322 pushes the third actuator 38 to move leftward. In this process, the first sealing surface 3221 opens the first through hole 112, and the second sealing surface 381 opens the gas outlet 131. At this time, the gas fuel flows through the second through hole 331, the flow hole 311, the first through hole 112, the first accommodating chamber 121, the first opening 3222, the channel, the second opening 3223 and the third accommodating chamber 17 in sequence, and finally flows out of the injector through the outlet gas. The injector under this working condition is in a small gas injection state. Figure 5 In the third working condition, the first driving member 21 and the second driving member 22 are energized at the same time, the first actuator 31 moves to the right, and the sleeve 322 moves to the left. In this process, the flow hole 311 and the flow groove 312 are both connected with the first through hole 112, and the first sealing surface 3221 opens the first through hole 112, so that the flow hole 311 and the flow groove 312 can be connected with the first accommodating chamber 121, and the second sealing surface 381 opens the gas outlet 131. At this time, the gas fuel flows through the second through hole 331, the flow hole 311 and the flow groove 312 in sequence (the gas fuel flows through the flow hole 311 and the flow groove 312 at the same time, and the two gas fuels can flow to the downstream after exiting the first through hole 112), the first through hole 112, the first accommodating chamber 121, the first opening 3222, the channel, the second opening 3223 and the third accommodating chamber 17, and finally flows out of the injector through the outlet gas. The injector under this working condition is in the large volume gear injection state.

[0049] The gas fuel injector of the present application has an increased overall flow cross-sectional area and an increased overall injection volume of the injector in the large volume gear compared to the small volume gear. The arrangement of the flow hole 311 and the flow slot 312, combined with the first actuator 31 at different positions, can meet the precise control of the injection volume of the entire flow range.

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A gas fuel injector, characterized in that: include: The housing comprises an air inlet, an air outlet and a first accommodating cavity which are interconnected, wherein the first accommodating cavity is extended along a first axis and is located between the air inlet and the air outlet; A driving assembly, disposed on the housing; and an actuator, disposed in the first accommodating chamber, the actuator comprising a first actuator and a second actuator, the first actuator being closer to the air inlet than the second actuator, the driving assembly being used to drive at least one of the first actuator and the second actuator to move along the first axis, the first actuator being provided with a flow hole and a flow groove that is not communicated with the flow hole, the flow hole and the flow groove being configured to be able to communicate with the first accommodating chamber; Wherein, the ejector includes a first operating condition, a second operating condition and a third operating condition; In the first working condition, one end of the second actuator close to the air inlet abuts against the first actuator, so that the flow hole is not connected to the first accommodating chamber; In the second working condition, the second actuator can move along the first axis in a direction away from the first actuator under the action of the driving assembly, so that the flow hole is connected with the first accommodating chamber; In the third working condition, the second actuator can move along the first axis in a direction away from the first actuator under the action of the driving assembly, and the first actuator can move along the first axis in a direction away from the second actuator under the action of the driving assembly, so that the flow hole and the flow groove are both connected to the first accommodating chamber; The circulation groove is arranged at the periphery of the circulation hole; The shell includes a first shell portion, the first shell portion is provided with a second accommodating chamber connected to the air inlet and a first through hole connected to the second accommodating chamber, a step surface is formed between the first accommodating chamber and the first through hole, the first actuator is accommodated in the second accommodating chamber and is configured to be able to abut against the step surface, the step surface is arranged corresponding to the circulation groove, the first through hole is connected to the circulation hole, and the second actuator is used to separate or connect the first accommodating chamber and the first through hole.

2. The gas fuel injector according to claim 1, characterized in that The actuator assembly further includes a first limiter and a first elastic member, wherein the first limiter is disposed at the air inlet, and the first elastic member abuts between the first limiter and the first actuator to enable the first actuator to abut against the step surface.

3. The gas fuel injector according to claim 2, characterized in that The actuator assembly further includes an adjusting member, which is disposed between the first limiting member and the first shell portion and is used to adjust an axial stroke of the first actuator.

4. The gas fuel injector according to claim 2, characterized in that The first limiting member is provided with a second through hole, and the second through hole is used to connect the air inlet and the flow hole.

5. The gas fuel injector according to claim 1, characterized in that The shell includes a second shell portion and a third shell portion which are connected to each other, the first accommodating chamber is formed in the second shell portion, the air outlet is formed in the third shell portion, a third accommodating chamber is arranged between the second shell portion and the third shell portion, the second actuator at least partially extends along the first axis to the third accommodating chamber, and the second actuator is provided with a channel for connecting the first accommodating chamber and the third accommodating chamber.

6. The gas fuel injector according to claim 5, characterized in that The second actuator includes a sliding sleeve, the second shell portion is sleeved on the sliding sleeve, and the channel is arranged on the sliding sleeve.

7. The gas fuel injector according to claim 6, characterized in that The actuator assembly also includes a second limit member and a second elastic member, the second limit member is connected to the second shell, the second elastic member is sleeved on the sliding sleeve and abuts between the second limit member and the sliding sleeve, and the second elastic member is used to move the sliding sleeve toward the first actuator.

8. The gas fuel injector according to any one of claims 1 to 7, characterized in that: The actuator assembly further includes a third actuator, which is disposed at one end of the second actuator close to the air outlet and is configured to open or seal the air outlet under the action of the second actuator.

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