Solenoid valve gas fuel injector

Abstract

The present application relates to a solenoid valve type gas fuel injector, comprising: a housing, the housing having a housing cavity extending along a first axis; an electromagnetic assembly, the electromagnetic assembly comprising a coil, and an iron core and an armature located in the housing cavity; the iron core and the armature are relatively arranged in the housing cavity along a direction parallel to the first axis, the coil is connected to the outside of the housing and arranged around the iron core; the iron core is configured to be able to drive the armature to move to a preset position along the first axis toward a side close to the iron core when the coil is energized; when the armature is in the preset position, there is a preset interval between the iron core and the armature in a direction parallel to the first direction axis. After the follower of the present application reaches the preset position, there is still a gap between the armature and the iron core, so that the armature avoids direct collision with the iron core, thereby extending the life of the injector.

Description

Technical Field

[0001] The present application relates to the technical field of injectors, and in particular to a solenoid valve type gas fuel injector. Background Art

[0002] Under the dual carbon strategy, hydrogen-fueled internal combustion engines are widely used in medium and heavy-duty vehicles, ship engines, engineering machinery and other application fields that require high load and high power density for internal combustion engines. The reliability of gas fuel injectors in hydrogen-fueled internal combustion engines directly affects the performance and life of the engine.

[0003] The armature of the fuel injector moves under the action of electromagnetic force and completes the movement after impacting with the fixed iron core. For traditional liquid fuel engines, the liquid fuel plays a damping role and can consume the impact energy between the armature and the iron core. The impact wear life of the armature and the iron core is relatively long and will not cause wear and failure. For gas fuel engines, the gas cannot provide sufficient damping to the armature and cannot consume enough impact energy. Therefore, the impact wear of the armature and the iron core is serious, which affects the service life of the injector. In the related technology, some of the anti-impact structures are more complicated, which increases the cost of the injector, and some use materials such as rubber to buffer the impact of the armature. Such materials have poor high temperature resistance and are prone to failure. Summary of the invention

[0004] Based on this, it is necessary to provide a solenoid valve type gas fuel injector with a simple structure and stable armature impact prevention to address the above problem.

[0005] In one aspect, a solenoid valve type gas fuel injector is provided, comprising:

[0006] A housing having a receiving cavity extending along a first axis;

[0007] An electromagnetic assembly, the electromagnetic assembly comprising a coil, and an iron core and an armature located in the accommodating cavity; the iron core and the armature are relatively arranged in the accommodating cavity along a direction parallel to the first axis, 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 the first axis toward a side close to the iron core to a preset position when the coil is energized; when the armature is at the preset position, the injector allows gas to pass through;

[0008] When the armature is in the preset position, a preset interval along a direction parallel to the first direction axis.

[0009] In one embodiment, the iron core is provided with a first guide hole extending therethrough, and the injector further comprises:

[0010] A follower is inserted into the first guide hole; the follower is in transmission connection with the armature and moves along the first axis under the action of the armature;

[0011] The limiter is configured to limit the movement of the follower to the limit position to stop the movement; when the follower reaches the limit position, the armature is located at the preset position. The collision between the armature and the iron core is transferred to between the limiter and the follower, and the follower stops moving after being limited by the limiter, and there is a preset interval between the armature and the iron core.

[0012] In one embodiment, the follower includes a guide portion and a contact portion; the guide portion is inserted into the first guide hole, one end of which is transmission-connected to the armature, and the other end of which is connected to the contact portion; when the follower is located at the limit position, the end of the contact portion away from the guide portion abuts against the limit portion.

[0013] In one embodiment, the shell is provided with an air inlet and an air outlet at opposite ends along the first axis; the shell includes a main body and an air inlet connector connected to one end of the main body, the air inlet connector is provided with the air inlet, and the air inlet connector is provided with a first step portion at one end facing the armature, and the first step portion is the limit member.

[0014] In one of the embodiments, the air inlet connecting member is provided with a second step portion, an elastic member is provided between the second step portion and the follower, and when the follower moves along the first axis toward the air inlet, the elastic member is compressed.

[0015] In one embodiment, the iron core has a first end face away from the armature and a second end face facing the armature; the first movement stroke of the follower is defined between the limit member and the first end face;

[0016] The armature has an upper end face facing the iron core; when the armature is not driven by the coil, it is located in an initial position, at which time there is a second distance between the second end face and the upper end face, and the second distance is greater than the first movement stroke, thereby preventing the armature from directly hitting the iron core.

[0017] In one embodiment, the difference between the second distance and the first movement stroke is less than or equal to 0.5 mm.

[0018] In one of the embodiments, an adjustment gasket is provided between the limit member and the iron core for precisely adjusting and controlling the first movement stroke.

[0019] In one embodiment, there is a gap between the circumferential side of the follower and the inner wall of the first guide hole, and the width of the gap is greater than or equal to 0.005 mm and less than or equal to 0.5 mm.

[0020] In one of the embodiments, the shell is provided with an air inlet and an air outlet at opposite ends along the first axis; the shell includes a main body and an air outlet seal connected to one end of the main body, the air outlet seal is provided with the air outlet, the armature is located in an initial position when not driven by the iron core, and the armature seals the air outlet at this time; when the armature moves along the first axis toward the air inlet, the air outlet is connected to the air inlet.

[0021] The present application realizes the opening and closing of the injector through an electromagnetic component. The armature can move along the first axis under the drive of the electromagnetic force. When the armature moves to a preset position, there is a preset interval between the armature and the iron core, so that the armature avoids direct collision with the iron core. The structure is streamlined and the life of the injector is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the cross-sectional structure of an injector in one embodiment of the present application.

[0023] Figure 2 It is a partial enlarged cross-sectional view of the armature of the injector in an embodiment of the present application in an initial position. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] See also Figure 1 , Figure 1 The structure diagram of the solenoid valve type gas fuel injector in one embodiment of the present application is shown. The injector 1 provided in one embodiment of the present application includes a housing 100, an electromagnetic assembly 200, a follower 300 and a stopper. The electromagnetic assembly 200 is arranged on the housing 100, and the follower 300 and the stopper are both arranged inside the housing 100.

[0031] The housing 100 is provided with an air inlet 121 and an air outlet 131 at opposite ends along the first axis 10, and the housing 100 includes a housing cavity between the air inlet 121 and the air outlet 131. The housing 100 includes a body 110, an air inlet connector 120 connected to one end of the body 110, and an outlet seal 130 connected to the other end of the body 110. The body 110 is provided with an accommodation cavity extending along the first axis 10, and the air inlet connector 120 is provided with an air inlet 121. The outlet seal 130 is located at one end of the body 110 away from the air inlet connector 120, and the outlet seal 130 is provided with an air outlet 131. The body 110 is a cylindrical structure, and a first opening and a second opening are formed at both ends of the body 110 in the longitudinal direction, and the accommodation cavity runs through the body 110 and connects the first opening and the second opening. The air inlet connector 120 is provided at the first opening and is sealed and connected to the first opening in the circumferential direction. The outlet seal 130 is disposed at the second opening and seals the second opening in a circumferential direction.

[0032] The body 110 includes a first body 111 and a second body 112. The first body 111 and the second body 112 are both cylindrical structures. The first body 111 and the second body 112 are connected to form a receiving cavity. An installation cavity is also formed outside the receiving cavity between the first body 111 and the second body 112 for receiving the coil 210 and the corresponding circuit.

[0033] The electromagnetic assembly 200 includes a coil 210, an iron core 220 and an armature 230. The coil 210 is connected to the circumferential side of the housing 100 and at corresponding positions of the iron core 220 and the armature 230. The iron core 220 and the armature 230 are arranged in an accommodating cavity. The iron core 220 is located between the air intake connector 120 and the armature 230, and the iron core 220 is provided with a first guide hole 221 penetrating therethrough. Specifically, the coil 210 is located inside the circumferential side wall of the body 110, the iron core 220 is located in the accommodating cavity, and the coil 210 is at least partially surrounded by the outside of the iron core 220. On the first axis 10, at least a portion of the coil 210 is at the same height as at least a portion of the iron core 220.

[0034] When the coil 210 is energized, the coil 210 and the iron core 220 form an electromagnetic force that attracts the armature 230. Under the driving action of the electromagnetic force, the armature 230 can move to a preset position along the first axis 10 toward a side close to the iron core 220. When the armature 230 is at the preset position, the iron core 220 and the armature 230 are at a preset interval in a direction parallel to the first direction axis 10.

[0035] The armature 230 has a first connecting hole 231 extending therethrough, and the first connecting hole 231 is connected to the air inlet 121 . The follower 300 has a second connecting hole 310 extending therethrough, and the first connecting hole 231 and the second connecting hole 310 are connected to each other, and the first connecting hole 231 is connected to the air outlet 131 , and the second connecting hole 310 is connected to the air inlet 121 .

[0036] The first connecting hole 231 includes a groove portion 2311, a longitudinal hole portion 2312 and a transverse hole portion 2313. The groove portion 2311 is provided on the side of the first connecting hole 231 facing the follower 300, and the transverse hole portion 2313 is provided on the side of the first connecting hole 231 away from the follower 300. The longitudinal hole portion 2312 is provided between the groove portion 2311 and the transverse hole portion 2313. The inner diameter of the groove portion 2311 is larger than the inner diameter of the longitudinal hole portion 2312, so as to form a step surface between the groove portion 2311 and the longitudinal hole portion 2312, and the guide portion of the follower 300 is connected to the groove portion 2311, and the end face of the guide portion is arranged against the step surface. The longitudinal hole portion 2312 extends along the first axis 10, and the extending direction of the transverse hole portion 2313 intersects with the first axis 10. The transverse hole portion 2313 is connected to one end of the longitudinal hole portion 2312 away from the groove portion 2311.

[0037] Furthermore, there is substantially no gap between the outer side surface of the core 220 and the armature 230 in the circumferential direction and the inner side wall of the body 110. There can be no gap between the outer side surface of the core 220 in the circumferential direction and the inner side wall of the body 110. Since the armature 230 is to move in the accommodating cavity, the gap between the outer side surface of the armature 230 in the circumferential direction and the inner side wall of the body 110 is greater than or equal to 0.005 mm and less than or equal to 0.5 mm.

[0038] The armature 230 includes a moving portion 231 and a sealing portion 233. The outer diameter of the moving portion 231 is larger than the diameter of the sealing portion 233. The gap between the outer side surface of the moving portion 231 and the inner side wall of the body 110 is greater than or equal to 0.005 mm and less than or equal to 0.5 mm. The gap between the outer side surface of the sealing portion 233 and the inner side wall of the body 110 is much larger than 0.005 mm. The transverse hole portion 2313 is provided in the sealing portion 233, and the transverse hole portion 2313 communicates with the longitudinal hole portion 2312 and the gap between the outer side surface of the sealing portion 233 and the inner side wall of the body 110.

[0039] Furthermore, a sealing portion 233 is formed at one end of the armature 230 facing the air outlet 131, and the sealing portion 233 can be sealed and connected with the air outlet 131. Since most of the structure of the first communication hole 231 is arranged along the first axis 10, by providing the transverse hole portion 2313, one end of the armature 230 can form an end surface that can seal the air outlet 131. When the armature 230 is not driven by the coil 210, it is located at the initial position, and the armature 230 seals the air outlet 131. When the armature 230 moves along the first axis 10 toward the air inlet 121, the air outlet 131 can be connected with the air inlet 121. Specifically, when the armature 230 is not driven by the coil 210, it is located at the initial position. At this time, the sealing portion 233 of the armature 230 is sealed and connected with the air outlet 131. When the armature 230 moves along the first axis 10 toward the air inlet 121, the sealing portion 233 leaves the air outlet 131, and the air outlet 131 can be connected with the air inlet 121 through the first connecting hole 231 and the second connecting hole 310. The air outlet 131 is opened to complete the injection of gas. By setting the sealing portion 233 and the transverse hole portion 2313, the armature 230 can not only connect the air outlet 131 and the air inlet 121, but also seal the air outlet 131, and the structure is simple and compact. Furthermore, a sealing gasket 600 is also provided between the sealing portion 233 and the outlet seal 130. The sealing gasket 600 is annular and is arranged around the air outlet 131, which can increase the sealing between the air outlet 131 and the sealing portion 233.

[0040] The follower 300 is inserted into the first guide hole 221, and the follower 300 is in transmission connection with the armature 230 to follow the armature 230 to move along the first axis 10. The limiter is arranged between the follower 300 and the air inlet 121, and the limiter can limit the follower 300 to move to the limit position to stop the movement. When the follower 300 is at the limit position, there is a preset interval between the armature 230 and the iron core 220.

[0041] Furthermore, the follower 300 includes a guide portion 330 and a contact portion 320. The guide portion 330 is inserted into the first guide hole 221, one end of the guide portion 330 is transmission-connected to the armature 230, and the other end is connected to the contact portion 320; when the follower 300 is located at the limit position, the end of the contact portion 320 away from the guide portion 330 abuts against the limit member, and the abutment of the contact portion 320 stops the follower 300 from moving. The guide portion 320 extends along the first axis 10, and the length of the guide portion 330 exceeds the length of the first guide hole 221, so that the guide portion 330 can move relative to the first guide hole 221 without leaving the range of the first guide hole 221. The contact portion 320 is convexly arranged at one end of the guide portion 330, and under certain conditions, the contact portion 320 can be stuck on a side surface of the iron core 220 and will not enter the first guide hole 221.

[0042] Furthermore, there is a gap between the outer circumference of the follower 300 and the inner wall of the first guide hole 221, and the width of the gap is greater than or equal to 0.005 mm and less than or equal to 0.5 mm. Furthermore, the width of the gap is greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

[0043] In this embodiment, the first step portion 122 is provided at one end of the air intake connector 120 facing the armature 230, and the first step portion 122 is a limiter, that is, the limiter is integrally formed with the air intake connector 120, and specifically, the limiter is formed at one end of the air intake connector 120 facing the armature 230. When the follower 300 moves to the limit position, the contact portion 320 abuts against the first step portion 122, so that the follower 300 stops moving along the first axis 10. The first step portion 122 is in a protruding step shape, which can limit the movement of the follower 300 without hindering the passage of gas.

[0044] In other embodiments, the limiting member may also be provided separately from the air inlet connector 120; the limiting member may also be provided in other non-step-shaped structures.

[0045] The iron core 220 has a first end face 222 away from the armature 230 and a second end face 223 facing the armature 230. The first end face 222 and the second end face 223 are two opposite side faces of the iron core 220 along the first axis 10. The first guide hole 221 runs through the entire iron core 220, that is, it is located between the first end face 222 and the second end face 223. There is a first distance L1 between the first step portion 122 and the first end face 222. The first distance L1 defines a first movement stroke L2 of the follower 300, that is, the follower 300 moves between the first step portion 122 and the first end face 222.

[0046] The armature 230 has an upper end surface facing the core 220. When the armature 230 is not driven by the coil 210, it is located at an initial position, at which time there is a second distance between the second end surface 223 and the upper end surface, and the second distance is greater than the first movement stroke L2. Specifically, the first movement stroke L2 is equal to the difference between the first distance L1 and the thickness of the contact portion 330.

[0047] Since the follower 300 is in transmission connection with the armature 230, when the coil 210 is energized, the coil 210 and the iron core 220 jointly drive the armature 230 to move along the first axis 10 toward the air inlet 121, and the follower 300 moves along the first axis 10 toward the air inlet 121 driven by the armature 230. When the follower 300 moves to the limit position, the follower 300 stops moving under the action of the limit member, and the armature 230 in transmission connection with the follower 300 is also forced to stop moving, and the armature 230 is at the terminal position at this time. When the follower 300 moves from the first end face 222 to the limit position of the first step portion 122, the follower 300 travels the first distance L1, and the armature 230 also reaches the terminal position from the initial position and travels the first distance L1. Since when the armature 230 is at the initial position, there is a second distance L3 between the second end face 223 and the upper end face, and the second distance L3 is greater than the first movement stroke L2, when the armature 230 is at the terminal position, there is a gap between the armature 230 and the iron core 220, so that the armature 230 avoids collision with the iron core 220.

[0048] The difference between the second distance L3 and the first movement stroke L2 is less than or equal to 1 mm, and the difference between the second distance L3 and the first movement stroke L2 is defined as a preset interval, and the residual gap is less than or equal to 1 mm. Further, the difference between the second distance L3 and the first movement stroke L2 is less than or equal to 0.5 mm. In this embodiment, the difference between the second distance L3 and the first movement stroke L2 is less than or equal to 0.2 mm, that is, the preset interval is less than or equal to 0.2 mm.

[0049] Furthermore, the air inlet connector 120 is provided with a second step portion 123, and an elastic member is provided between the second step portion 123 and the follower 300. When the follower 300 moves along the first axis 10 toward the air inlet 121, the elastic member is compressed. When the coil 210 is energized, the coil 210 and the iron core 220 jointly drive the armature 230 to move along the first axis 10 toward the air inlet 121, and the follower 300 moves along the first axis 10 toward the air inlet 121 driven by the armature 230, overcoming the force of the elastic member on the follower 300 and compressing the elastic member. When the coil 210 is de-energized, the driving force of the coil 210 and the armature 230 disappears, and the follower 300 moves away from the air inlet 121 along the first axis 10 under the action of the restoring force of the elastic member, driving the armature 230 back to the initial position.

[0050] Specifically, one end of the elastic member 500 abuts against the second step portion 123, and the other end abuts against the contact portion 320. The second step portion 123 and the first step portion 122 (i.e., the stopper) are sequentially arranged along the first axis 10, and the second step portion 123 is located between the first step portion 122 and the air inlet 121. In the present embodiment, the elastic member 500 is arranged in a channel formed by the air inlet connector 120 between the first step portion 122 and the second step portion 123, and the channel is connected to the air inlet 121. A gasket is provided between the elastic member 500 and the second step portion 123. It can be understood that a through hole is provided in the middle of the gasket, and the through hole connects the channel and the air inlet 121. The gasket can increase the compression of the second step portion 123 on the elastic member 500 along the direction of the first axis 10.

[0051] The limiting member and the iron core 220 limit the movement stroke of the follower 300, and an adjustment gasket 400 is provided between the limiting member and the iron core 220. It can be understood that the adjustment gasket 400 is annular, with a through hole in the middle, and does not hinder the air inlet 121 from connecting to the air outlet 131. In this embodiment, the first step portion 122 includes a limiting step surface 1221 and a connecting end surface 1222, the limiting step surface 1221 is used to limit the follower 300, and the connecting end surface 1222 is provided between the limiting step surface and the iron core 220, and the connecting end surface 1222 is an end surface of the air inlet connector 120 against the external structure. The distance between the limiting step surface and the first end surface 222 of the iron core 220 is the first distance L1.

[0052] An adjusting gasket 400 is provided between the connecting end face 1222 and the iron core 220. Furthermore, an adjusting gasket 400 is provided between the connecting end face 1222 and the first end face 222 of the iron core 220. The adjusting gasket 400 is used to adjust the size of the first distance L1 (i.e., the first movement stroke L2). When the first distance L1 needs to be increased or decreased, it can be achieved by simply replacing the adjusting gasket 400 of the corresponding thickness. The adjusting gasket 400 is located between the air intake connector 120 and the iron core 220. The adjusting gasket 400 can be replaced by removing the air intake connector 120. The replacement is convenient. The adjusting gasket 400 enables the first distance L1 to be accurately controlled and adjusted. With the current gasket processing technology accuracy and assembly control accuracy, the minimum controllable residual gap is an accuracy of 0.05 mm.

[0053] In this embodiment, the follower 300 and the air intake connector 120 (which can also be a limiter) are made of metal materials, and the follower 300 and the air intake connector 120 are subjected to hardening heat treatment so that the hardness of one or more of the follower 300 and the air intake connector 120 is within the range of 300-1200HV, which can be suitable for high-frequency impact in a high-temperature environment.

[0054] The working principle of the injector is briefly described below. When the coil 210 is not energized, the armature 230 is at the initial position, and the distance between the follower 300 and the stopper along the first axis 10 is the first distance L1; at this time, the sealing portion 233 of the armature 230 is sealed and connected to the air outlet 131. When the coil 210 is energized, the coil 210 and the iron core 220 jointly drive the armature 230 to move along the first axis 10 toward the air inlet 121, and the follower 300 moves along the first axis 10 toward the air inlet 121 driven by the armature 230, overcomes the force of the elastic member 500 on the follower 300, and compresses the elastic member 500; when the follower 300 moves the first movement stroke L2 to reach the limit position, under the action of the limit member there, the follower 300 stops moving, and the armature 230 transmission-connected to the follower 300 is also forced to stop moving, and the armature 230 is at the terminal position at this time; the sealing portion 233 of the armature 230 leaves the air outlet 131, and the air outlet 131 can be connected with the air inlet 121 through the first connecting hole 231 and the second connecting hole 310, and the air outlet 131 is opened to complete the injection of the gas. When the coil 210 is powered off, the driving force of the coil 210 and the armature 230 disappears, and the follower 300 moves away from the air inlet 121 along the first axis 10 under the restoring force of the elastic member 500, driving the armature 230 back to the initial position; at this time, the sealing portion 233 of the armature 230 is sealed and connected with the air outlet 131. Since there is a second distance L3 between the second end face 223 and the upper end face when the armature 230 is at the initial position, and the second distance L3 is greater than the first movement stroke L2, there is a gap between the armature 230 and the iron core 220 when the armature 230 is at the terminal position, so that the armature 230 avoids colliding with the iron core 220, and the collision site is transferred to the follower 300 and the limiter. Since the armature 230 and the core 220 are made of magnetic materials, the hardness and rigidity of magnetic materials are not as good as those of metal materials and are not resistant to impact. The follower 300 and the limiter can be made of high-hardness metal materials or other high-hardness materials that are resistant to high temperatures, friction and impact, and have lower processing and replacement costs.

[0055] 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.

[0056] 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 solenoid valve type gas fuel injector, characterized in that: include: A housing having a receiving cavity extending along a first axis; An electromagnetic assembly, the electromagnetic assembly comprising a coil, and an iron core and an armature located in the accommodating cavity; the iron core and the armature are relatively arranged in the accommodating cavity along a direction parallel to the first axis, 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 the first axis toward a side close to the iron core to a preset position when the coil is energized; When the armature is at the preset position, there is a preset interval between the iron core and the armature in a direction parallel to the first axis; The iron core is provided with a first guide hole penetrating therethrough, and the injector further comprises: A follower is inserted into the first guide hole; the follower is in transmission connection with the armature and moves along the first axis under the action of the armature; a limiter configured to limit the follower to move to a limit position to stop the movement; when the follower reaches the limit position, the armature is located at the preset position; The housing is provided with an air inlet and an air outlet at two opposite ends along the first axis; the housing comprises a body and an air inlet connector connected to one end of the body, the air inlet connector is provided with the air inlet, and the air inlet connector is provided with a first step portion at one end facing the armature, the first step portion being the limiter; The follower includes a guide portion and a contact portion; the guide portion is inserted into the first guide hole, one end of which is transmission-connected to the armature, and the other end of which is connected to the contact portion, the guide portion extends along the first axis, and the length of the guide portion exceeds the length of the first guide hole; when the follower is located at the limit position, one end of the contact portion away from the guide portion abuts against the limit member.

2. The solenoid valve type gas fuel injector according to claim 1, characterized in that: The air inlet connecting member is provided with a second step portion, and an elastic member is provided between the second step portion and the driven member. When the driven member moves toward the air inlet along the first axis, the elastic member is compressed.

3. The solenoid valve type gas fuel injector according to claim 1, characterized in that: The iron core has a first end face away from the armature and a second end face facing the armature; the first movement stroke of the follower is defined between the limiter and the first end face; The armature has an upper end surface facing the iron core; when the armature is not driven by the coil, it is located at an initial position, at which time there is a second distance between the second end surface and the upper end surface, and the second distance is greater than the first movement stroke.

4. The solenoid valve type gas fuel injector according to claim 3, characterized in that: The difference between the second distance and the first movement stroke is less than or equal to 0.5 mm.

5. The solenoid valve type gas fuel injector according to claim 1, characterized in that: An adjusting gasket is provided between the limiting member and the iron core.

6. The solenoid valve type gas fuel injector according to claim 1, characterized in that: A gap is provided between the peripheral side of the follower and the inner wall of the first guide hole, and a width of the gap is greater than or equal to 0.005 mm and less than or equal to 0.5 mm.

7. The solenoid valve type gas fuel injector according to claim 1, characterized in that: The shell is provided with an air inlet and an air outlet at opposite ends along the first axis; the shell includes a main body and an air outlet seal connected to one end of the main body, the air outlet seal is provided with the air outlet, the armature is located in an initial position when not driven by the iron core, and the armature seals the air outlet at this time; when the armature moves along the first axis toward the air inlet, the air outlet is connected to the air inlet.

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