Fuel Injectors

Abstract

The present application relates to a fuel injector. The fuel injector includes a main body, a sealing assembly and a driving assembly. The main body has a fuel inlet and a fuel outlet arranged relatively to each other along a first direction. The sealing assembly includes a first sealing member movably arranged inside the main body along the first direction, and when the first sealing member is in a sealing position, the first sealing member blocks the fuel inlet and the fuel outlet. When the first sealing member is in a non-sealing position, the fuel inlet and the fuel outlet are connected to each other. The driving assembly is used to drive the first sealing member to move between a sealing position and a non-sealing position along the first direction. Compared with the fuel outlet, the first sealing member and its sealing position are arranged closer to the fuel inlet. This makes the first sealing member relatively far away from the high temperature environment in the cylinder when the fuel injector is in use, so the temperature of the environment in which the first sealing member is located will not be very high, so the first sealing member can maintain the sealing effect for a long time.

Description

Technical Field

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

[0002] Hydrogen internal combustion engines have begun to be widely used in high-load and high-power equipment such as medium and heavy trucks, marine engines, and construction machinery. In these fields, engines generally use in-cylinder gas direct injection technology, which has high requirements for the sealing of fuel injectors. However, traditional fuel injectors need to inject gas fuel on the cylinder head of the engine, which makes the working environment of the fuel injector relatively harsh, causing the sealing effect of the fuel injector to fail quickly. Summary of the invention

[0003] Based on this, it is necessary to provide a fuel injector to address the problem that traditional fuel injectors need to inject gaseous fuel on the cylinder head of the engine, which makes the working environment of the fuel injector relatively harsh and causes the sealing effect of the fuel injector to fail quickly.

[0004] According to a first aspect of the present application, a fuel injector is provided for injecting gaseous fuel into a cylinder of an engine, wherein the fuel injector comprises:

[0005] The main body has a fuel inlet and a fuel outlet arranged opposite to each other along a first direction; the fuel inlet is used to receive gaseous fuel, and the fuel outlet is used to communicate with the cylinder and inject gaseous fuel;

[0006] a sealing assembly, comprising a first sealing member movably disposed inside the main body portion along the first direction, wherein the first sealing member has a sealing position and a non-sealing position during movement along the first direction, and when the first sealing member is in the sealing position, the first sealing member blocks the fuel inlet and the fuel outlet; when the first sealing member is in the non-sealing position, the fuel inlet and the fuel outlet are connected to each other; and

[0007] a driving assembly connected to the first sealing member to drive the first sealing member to move between the sealing position and the non-sealing position along the first direction;

[0008] Wherein, along the first direction, the first sealing member and the sealing position thereof are arranged closer to the fuel inlet than to the fuel outlet.

[0009] In one embodiment, from the fuel inlet to the fuel outlet, the main body portion includes a first barrel segment and a second barrel segment connected in sequence, and the radial dimension of the first barrel segment is smaller than the radial dimension of the second barrel segment, so as to form an abutment step at the connection between the first barrel segment and the second barrel segment;

[0010] The first sealing member is configured to abut against the abutting step when located at the sealing position, so as to block the communication between the first barrel section and the second barrel section.

[0011] In one embodiment, the driving assembly includes an armature and an electromagnetic coil arranged corresponding to the armature, and the armature is connected to a side of the first sealing member away from the first cylinder segment;

[0012] The electromagnetic coil is disposed inside the main body, and is used to drive the armature to move toward the fuel outlet when energized, so as to drive the first sealing member to leave the sealing position;

[0013] The armature is provided with a plurality of first holes. When the first sealing member is in the non-sealing position, the fuel inlet is connected with the fuel outlet through the first holes.

[0014] In one embodiment, the drive assembly further includes a first reset member, which is disposed between the armature and the fuel outlet, and the first reset member is configured to reset the armature and the first seal to the sealing position when the electromagnetic coil is de-energized.

[0015] In one of the embodiments, the fuel injector further includes a first step disposed between the first seal and the fuel outlet;

[0016] The first restoring member includes a first spring disposed between the first step and the armature, and the first spring abuts against the first step and the armature respectively.

[0017] In one embodiment, the fuel injector further comprises a limiting portion disposed between the first sealing member and the fuel outlet, wherein the limiting portion is protrudingly disposed on the inner wall of the second barrel section;

[0018] The sealing assembly further comprises a buffer member connected to a side of the armature away from the first sealing member, and the buffer member is configured to abut against the limiting portion before the armature when the first sealing member moves toward the non-sealing position.

[0019] In one embodiment, the sealing assembly further comprises a second sealing member movably disposed in the main body portion along the first direction, wherein the second sealing member has a working position and a non-working position during the movement;

[0020] When the first seal is located at the sealing position, the first seal is located at the working position to seal the fuel outlet; when the first seal is located at the non-sealing position, the second seal is located at the non-working position to allow the fuel outlet to communicate with the cylinder.

[0021] In one embodiment, the second sealing member includes a rod-shaped body disposed in the main body portion and a sealing head disposed at one end of the rod-shaped body and extending from the fuel outlet to the outside; the radial dimension of the sealing head gradually increases from the fuel inlet to the fuel outlet, so as to form an abutment surface on a side of the sealing head close to the fuel outlet;

[0022] The main body is provided with a matching surface at the mouth of the fuel outlet corresponding to the abutment surface, so as to abut and match with the abutment surface when the second sealing member is located at the working position.

[0023] In one embodiment, the drive assembly further comprises a second reset member connected to the rod-shaped body, wherein the second reset member is configured to reset the second sealing member to the working position when no gas fuel flows in the main body portion.

[0024] In one embodiment, the fuel injector further comprises a second step disposed near the fuel outlet, wherein the second step is disposed extending from the inner wall of the main body portion along the radial direction of the main body portion;

[0025] The second sealing member also includes an abutment member arranged at the other end of the rod-shaped body relative to the sealing head, and the abutment member is provided with a plurality of second channels; the second reset member includes a second spring arranged between the abutment member and the second step, and the second spring abuts against the abutment member and the second step respectively.

[0026] In the technical solution of the present application, the fuel injector receives gaseous fuel through a fuel inlet and injects the gaseous fuel into the cylinder of the engine through a fuel outlet. In addition, the sealing assembly of the fuel injector blocks the gas transport in the gas delivery channel inside the main body through a first seal, and the first seal can move between a sealing position and a non-sealing position under the drive of a drive assembly. Compared with the fuel outlet, the first seal and its sealing position are arranged closer to the fuel inlet, which makes the first seal relatively far away from the high temperature environment in the cylinder when the fuel injector is in use, so the temperature of the environment in which the first seal is located will not be very high, so the first seal can maintain the sealing effect for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the fuel injector proposed in the present application.

[0028] Figure 2 for Figure 1 Schematic diagram of the structure of the first seal.

[0029] Figure 3 for Figure 1 Schematic diagram of the structure of the middle armature.

[0030] Figure 4 for Figure 1 Schematic diagram of the structure of the second seal.

[0031] Description of Figure Numbers:

[0032]

[0033] DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Hydrogen internal combustion engines have begun to be widely used in high-load and high-power equipment such as medium and heavy trucks, marine engines, and construction machinery. In these fields, engines generally use in-cylinder gas direct injection technology, which has high requirements for the sealing of fuel injectors. However, traditional fuel injectors need to inject gas fuel on the cylinder head of the engine, which makes the working environment of the fuel injector relatively harsh, causing the sealing effect of the fuel injector to fail quickly.

[0041] The inventor of this application has found through research that the fuel injector needs to open or close the gas fuel delivery channel according to the engine stroke, and the fuel injector uses a seal to block the fuel transportation in the gas fuel delivery channel when the gas fuel delivery channel needs to be closed. In traditional fuel injectors, the fuel injector generally sets a seal at the connection between the gas fuel delivery channel and the engine cylinder to block the transportation of gas fuel. However, when the engine is working, the temperature in the cylinder will be very high, which will accelerate the wear of the seal and affect the normal use of the fuel injector.

[0042] In view of this, the present application proposes a fuel injector, which aims to solve the problem that traditional fuel injectors need to inject gaseous fuel on the cylinder head of the engine, making the working environment of the fuel injector relatively harsh and causing the sealing effect of the fuel injector to fail quickly. Figures 1 to 4 It is a schematic structural diagram of an embodiment of a fuel injector proposed in the present application.

[0043] See also Figure 1 The fuel injector 100 proposed in the present application is used to inject gaseous fuel into the cylinder of the engine. The fuel injector 100 includes a main body 1, a sealing assembly 2 and a driving assembly 3. The main body 1 has a fuel inlet 11 and a fuel outlet 12 arranged opposite to each other along a first direction M. The fuel inlet 11 is used to receive the gaseous fuel, and the fuel outlet 12 is used to communicate with the cylinder and inject the gaseous fuel.

[0044] The sealing assembly 2 includes a first sealing member 21 that is movable along the first direction M and is disposed inside the main body 1. The first sealing member 21 has a sealing position and a non-sealing position during its movement along the first direction M. When the first sealing member 21 is in the sealing position, the first sealing member 21 blocks the fuel inlet 11 and the fuel outlet 12. When the first sealing member 21 is in the non-sealing position, the fuel inlet 11 and the fuel outlet 12 are connected to each other.

[0045] The driving assembly 3 is connected to the first sealing member 21 to drive the first sealing member 21 to move between the sealing position and the non-sealing position along the first direction M. Along the first direction M, the first sealing member 21 and its sealing position are arranged closer to the fuel inlet 11 than to the fuel outlet 12 .

[0046] In the present application, the first direction M is a relative direction, and the first direction M can be set as a relative direction between the fuel inlet 11 and the fuel outlet 12 .

[0047] In the technical solution of the present application, the fuel injector 100 receives gaseous fuel through the fuel inlet 11, and injects the gaseous fuel into the cylinder of the engine through the fuel outlet 12. In addition, the sealing assembly 2 of the fuel injector 100 blocks the gas transport in the gas delivery channel inside the main body 1 through the first seal 21, and the first seal 21 can move between the sealing position and the non-sealing position under the drive of the drive assembly 3. Compared with the fuel outlet 12, the first seal 21 and its sealing position are arranged closer to the fuel inlet 11, which makes the first seal 21 relatively far away from the high temperature environment in the cylinder when the fuel injector 100 is in use, so the temperature of the environment where the first seal 21 is located will not be very high, so the first seal 21 can maintain the sealing effect for a long time.

[0048] Please refer to and Figure 2 In some embodiments, from the fuel inlet 11 to the fuel outlet 12, the main body 1 includes a first barrel section 13 and a second barrel section 14 connected in sequence, and the radial dimension of the first barrel section 13 is smaller than the radial dimension of the second barrel section 14, so as to form an abutment step 15 at the connection between the first barrel section 13 and the second barrel section 14. The first sealing member 21 is configured to abut against the abutment step 15 when located at the sealing position, so as to block the connection between the first barrel section 13 and the second barrel section 14.

[0049] Specifically, the main body 1 is provided with a first barrel section 13 and a second barrel section 14 having different radial dimensions, so that an abutting step 15 is formed at the connection between the first barrel section 13 and the second barrel section 14. When the first seal 21 moves to the sealing position, it can abut against the abutting step 15, thereby blocking the abutment between the first barrel section 13 and the second barrel section 14. Therefore, when the first seal 21 abuts against the abutting step 15, the gas fuel can no longer move from the first barrel section 13 to the second barrel section 14, and at this time, the fuel injector 100 stops fuel transportation.

[0050] In fact, the first sealing member 21 can also block the gas transportation between the first barrel section 13 and the second barrel section 14 in other ways. For example, when the size of the gas transmission channel in the main body 1 gradually increases along the first direction M, and the first sealing member 21 is movably arranged in the gas transmission channel along the first direction M, when the first sealing member 21 moves to the sealing position, the first sealing member 21 will abut against the inner wall of the gas transmission channel and block the transportation of the gas fuel in the main body 1.

[0051] Please refer to 1 to Figure 3 In some embodiments, the driving assembly 3 includes an armature 32 and an electromagnetic coil 31 corresponding to the armature 32. The armature 32 is connected to the side of the first sealing member 21 away from the first barrel section 13. The electromagnetic coil 31 is arranged inside the main body 1. The electromagnetic coil 31 is used to drive the armature 32 to move toward the fuel outlet 12 when powered on, so as to drive the first sealing member to leave the sealing position. The armature 32 is provided with a plurality of first channels. When the first sealing member 21 is in the non-sealing position, the fuel inlet 11 is connected to the fuel outlet 12 through the first channels.

[0052] When the electromagnetic coil 31 is energized, a magnetic field is generated around it, thereby driving the armature 32 to move through electromagnetic force. When the armature 32 moves, it drives the first seal 21 to move together, and when the armature 32 drives the first seal 21 to move toward the non-sealing position, the first seal 21 will release the blockage of the first barrel section 13 and the second barrel section 14. When the armature 32 drives the first seal 21 to move toward the sealing position, the first seal 21 continues to block the first barrel section 13 and the second barrel section 14.

[0053] In addition, when the first seal 21 blocks the transportation of gaseous fuel in the first barrel section 13 and the second barrel section 14, the gaseous fuel cannot pass through the first seal 21. When the first seal 21 does not block the transportation of gaseous fuel in the first barrel section 13 and the second barrel section 14, the gaseous fuel can pass through the first seal 21 and continue to flow toward the fuel outlet 12 through the multiple first holes on the armature 32.

[0054] See also Figure 1In some embodiments, the drive assembly 3 further includes a first reset member 33, which is disposed between the armature 32 and the fuel outlet 12, and the first reset member 33 is configured to reset the armature 32 and the first seal 21 to a sealing position when the electromagnetic coil 31 is de-energized.

[0055] The fuel injector 100 needs to control the output of gaseous fuel according to the working stroke of the engine, so the fuel injector 100 cannot spray gaseous fuel all the time. Therefore, the first seal 21 needs to reciprocate between the sealing position and the non-sealing position. Therefore, in some embodiments, the drive assembly 3 also resets the first seal 21 to the sealing position through the first reset member 33. When the electromagnetic coil 31 is powered off, the electromagnetic force disappears. At this time, the armature 32 will not continue to drive the first seal 21 to move, and the first reset member 33 will drive the armature 32 and the first seal 21 to move toward the sealing position, so that the first seal 21 blocks the first barrel section 13 and the second barrel section 14 again.

[0056] Specifically, the fuel injector 100 further includes a first step 16 disposed between the first sealing member 21 and the fuel outlet 12. The first reset member 33 includes a first spring 33a disposed between the first step 16 and the armature 32, and the first spring 33a abuts against the first step 16 and the armature 32, respectively. When the electromagnetic coil 31 drives the armature 32 and the first sealing member 21 to move, the armature 32 compresses the first spring 33a. Therefore, when the electromagnetic coil 31 stops being energized, the electromagnetic force disappears, and at this time the first spring 33a extends outward, thereby pushing the armature 32 and the first sealing member 21 toward the sealing position, thereby resetting the first sealing member 21 to the sealing position.

[0057] In some embodiments, the fuel injector 100 further includes a stopper 4 disposed between the first sealing member 21 and the fuel outlet 12, the stopper 4 protruding from the side wall of the main body 1 toward the main body 1. The sealing assembly 2 further includes a buffer 23 connected to a side of the armature 32 away from the first sealing member 21, the buffer 23 being configured to abut against the stopper 4 before the armature 32 when the first sealing member 21 moves toward the non-sealing position.

[0058] In specific applications, the armature 32 drives the first seal 21 to move under the drive of the electromagnetic coil 31, but the armature 32 cannot drive the first seal 21 to a position too far, otherwise the first seal 21 may be difficult to return to the sealing position. In addition, when the distance between the first seal 21 and the fuel outlet 12 is close, the first seal 21 may be affected by the high temperature environment in the cylinder, resulting in unnecessary wear.

[0059] Therefore, a limiting portion 4 is provided between the first sealing member 21 and the fuel outlet 12, and the limiting portion 4 can limit the movement of the first sealing member 21 and the armature 32 toward the fuel outlet 12. However, since the electromagnetic force generated by the electromagnetic coil 31 is generally large, the armature 32 may collide with the limiting portion 4 when moving. Therefore, the sealing assembly 2 is further provided with a buffer 23, which is generally made of a soft or elastic material, and the buffer 23 can contact the limiting portion 4 before the armature 32, thereby avoiding unnecessary loss between the armature 32 and the limiting portion 4.

[0060] See also Figure 1 and Figure 4 In some embodiments, the sealing assembly 2 further includes a second sealing member 22 movably disposed in the main body 1 along the first direction M, and the second sealing member 22 has a working position and a non-working position during the movement. When the first sealing member 21 is located in the sealing position, the first sealing member 21 is located in the working position to seal the fuel outlet 12. When the first sealing member 21 is located in the non-sealing position, the second sealing member 22 is located in the non-working position to allow the fuel outlet 12 to communicate with the cylinder.

[0061] In specific applications, the second seal 22 can seal the fuel outlet 12 in the working position, and connect the fuel outlet 12 to the cylinder in the non-working position. Therefore, when the cylinder of the engine is working, the second seal 22 can seal the fuel outlet 12, thereby isolating the high temperature environment in the cylinder from the first seal 21, further preventing the high temperature in the cylinder from affecting the first seal 21.

[0062] In fact, the second seal 22 is generally made of metal material, so that the second seal 22 will not be greatly affected in a high temperature environment. Although the sealing performance of the second seal 22 is relatively general when the second seal 22 is made of metal material, the fuel injector 100 can meet the sealing requirements through the first seal 21.

[0063] In some embodiments, the second sealing member 22 includes a rod-shaped body 221 disposed in the main body 1 and a sealing head 222 disposed at one end of the rod-shaped body 221 and extending from the fuel outlet 12 to the outside. The radial dimension of the sealing head 222 gradually increases from the fuel inlet 11 to the fuel outlet 12, so as to form an abutment surface on the side of the sealing head 222 close to the fuel outlet 12. The main body 1 is provided with a mating surface at the mouth of the fuel outlet 12 corresponding to the abutment surface, so as to abut and cooperate with the abutment surface when the second sealing member 22 is in the working position.

[0064] When the second sealing member 22 is in the working position, the second sealing member 22 abuts against the abutting surface at the fuel outlet 12 through the abutting surface on the sealing head 222, thereby sealing the fuel outlet 12. When the second sealing member 22 is in the non-working position, the second sealing member 22 moves outwardly toward the fuel opening for a certain distance, so that the abutting surface on the sealing head 222 and the abutting surface at the fuel outlet 12 are separated from each other, and at this time, there is also a spacing space between the second sealing member 22 and the main body 1, thereby transporting gas fuel.

[0065] In some embodiments, the drive assembly 3 further comprises a second reset member 34 connected to the rod-shaped body 221 , and the second reset member 34 is configured to reset the second sealing member 22 to a working position when no gas fuel flows in the main body portion 1 .

[0066] In actual applications, the gas pressure of the gas fuel is relatively high, which also makes the impact force of the gas fuel relatively large. Therefore, when the gas fuel is transported in the main body 1, the gas fuel can directly push the second seal 22 to move outside the fuel opening, so that the second seal 22 no longer seals the fuel opening, so the gas fuel can also be transported normally. When the gas fuel is transported, the first seal 21 blocks the fuel transportation of the fuel inlet 11, and the second seal 22 is no longer impacted by the gas fuel. At this time, the second reset member 34 can reset the second seal 22 to the working position, so that the second seal 22 seals the fuel outlet 12 again, so that the high temperature environment in the cylinder will not affect the first seal 21.

[0067] In some embodiments, the fuel injector 100 further includes a second step 17 disposed near the fuel outlet 12, and the second step 17 is extended from the inner wall of the main body 1 along the radial direction of the main body 1. The second sealing member 22 further includes an abutment member 223 disposed at the other end of the rod-shaped main body 221 relative to the sealing head 222, and a plurality of second channels are disposed on the abutment member 223. The second reset member 34 includes a second spring 34a disposed between the abutment member 223 and the second step 17, and the second spring 34a abuts against the abutment member 223 and the second step 17 respectively.

[0068] The fuel injector 100 elastically compresses the second spring 34a between the second step 17 and the rod-shaped body 221 through the second step 17, so that when the second seal 22 is impacted by the gas fuel and moves toward the fuel outlet 12, the second seal 22 will compress the second spring 34a. Therefore, when the gas fuel is transported, the first seal 21 blocks the fuel transportation of the fuel inlet 11, and the second seal 22 is no longer impacted by the gas fuel. At this time, the second spring 34a can reset the second seal 22 to the working position through its own elastic force, so that the second seal 22 seals the fuel outlet 12 again, so that the high temperature environment in the cylinder will not affect the first seal 21.

[0069] In addition, the second reset member 34 can also be specifically configured as a magnet, and when the second sealing member 22 is no longer impacted by the gas fuel, the magnet resets the second sealing member 22 to the working position through magnetic force. Of course, the second reset member 34 can also reset the second sealing member 22 through other implementations, which are not specifically limited here.

[0070] 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.

[0071] 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 fuel injector for injecting gaseous fuel into a cylinder of an engine, characterized in that: The fuel injector comprises: The main body has a fuel inlet and a fuel outlet arranged opposite to each other along a first direction; the fuel inlet is used to receive gaseous fuel, and the fuel outlet is used to communicate with the cylinder and inject gaseous fuel; from the fuel inlet to the fuel outlet, the main body includes a first barrel section and a second barrel section connected in sequence; a sealing assembly, comprising a first sealing member movably disposed inside the main body portion along the first direction, wherein the first sealing member has a sealing position and a non-sealing position during movement along the first direction, and when the first sealing member is in the sealing position, the first sealing member blocks the fuel inlet and the fuel outlet; when the first sealing member is in the non-sealing position, the fuel inlet and the fuel outlet are connected to each other; and a driving assembly connected to the first sealing member to drive the first sealing member to move between the sealing position and the non-sealing position along the first direction; the driving assembly includes an armature and an electromagnetic coil corresponding to the armature, the armature is connected to a side of the first sealing member away from the first barrel section; the electromagnetic coil is arranged inside the main body, and the electromagnetic coil is used to drive the armature to move toward the fuel outlet when energized, so as to drive the first sealing member to leave the sealing position; Wherein, along the first direction, the first sealing member and the sealing position thereof are arranged closer to the fuel inlet than to the fuel outlet.

2. The fuel injector according to claim 1, characterized in that The radial dimension of the first barrel segment is smaller than the radial dimension of the second barrel segment, so as to form an abutment step at the connection between the first barrel segment and the second barrel segment; The first sealing member is configured to abut against the abutting step when located at the sealing position, so as to block the communication between the first barrel section and the second barrel section.

3. The fuel injector according to claim 2, characterized in that The armature is provided with a plurality of first holes. When the first sealing member is in the non-sealing position, the fuel inlet is connected with the fuel outlet through the first holes.

4. The fuel injector according to claim 3, characterized in that The drive assembly further includes a first reset member, which is disposed between the armature and the fuel outlet, and is configured to reset the armature and the first sealing member to the sealing position when the electromagnetic coil is de-energized.

5. The fuel injector according to claim 4, characterized in that The fuel injector further includes a first step disposed between the first seal and the fuel outlet; The first restoring member includes a first spring disposed between the first step and the armature, and the first spring abuts against the first step and the armature respectively.

6. The fuel injector according to claim 3, characterized in that The fuel injector further comprises a limiting portion disposed between the first sealing member and the fuel outlet, wherein the limiting portion is protrudingly disposed on the inner wall of the second barrel section; The sealing assembly further comprises a buffer member connected to a side of the armature away from the first sealing member, and the buffer member is configured to abut against the limiting portion before the armature when the first sealing member moves toward the non-sealing position.

7. The fuel injector according to claim 1, characterized in that The sealing assembly further comprises a second sealing member movably disposed in the main body portion along the first direction, wherein the second sealing member has a working position and a non-working position during movement; When the first sealing member is in the sealing position, the second sealing member is in the working position to seal the fuel outlet; When the first seal is in the non-sealing position, the second seal is in the inoperative position so that the fuel outlet is in communication with the cylinder.

8. The fuel injector according to claim 7, characterized in that The second sealing member comprises a rod-shaped body disposed in the main body portion and a sealing head disposed at one end of the rod-shaped body and extending from the fuel outlet to the outside; the radial dimension of the sealing head gradually increases from the fuel inlet to the fuel outlet, so as to form an abutment surface on a side of the sealing head close to the fuel outlet; The main body is provided with a matching surface at the mouth of the fuel outlet corresponding to the abutment surface, so as to abut and match with the abutment surface when the second sealing member is located at the working position.

9. The fuel injector according to claim 8, characterized in that The driving assembly further comprises a second restoring member connected to the rod-shaped main body, wherein the second restoring member is configured to restore the second sealing member to the working position when no gas fuel flows in the main body portion.

10. The fuel injector according to claim 9, characterized in that It also includes a second step disposed near the fuel outlet, wherein the second step is disposed extending from the inner wall of the main body portion along the radial direction of the main body portion; The second sealing member also includes an abutment member arranged at the other end of the rod-shaped body relative to the sealing head, and the abutment member is provided with a plurality of second channels; the second reset member includes a second spring arranged between the abutment member and the second step, and the second spring abuts against the abutment member and the second step respectively.

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