Gas injector

Abstract

The invention relates to the technical field of automobile power systems, in particular to a gas ejector which comprises a shell and a valve element mechanism, the shell is provided with a valve cavity, a gas inlet channel and a gas outlet channel, the gas inlet channel and the gas outlet channel are arranged on the two sides of the valve cavity in the preset direction, and the gas inlet channel and the gas outlet channel communicate with the valve cavity; the valve element mechanism comprises a plunger assembly, a cam and a driver, the plunger assembly can generate elastic deformation in the preset direction, the plunger assembly is slidably arranged in the valve cavity in the preset direction, one end of the plunger assembly abuts against the inner wall of the valve cavity and seals the air inlet channel, and the cam is arranged in the valve cavity and is in running fit with the shell. The peripheral wall of the cam abuts against the other end of the plunger assembly, the driver drives the cam to rotate, and a rotating shaft of the cam is perpendicular to the preset direction. According to the gas ejector, an electromagnetic valve in a gas ejector in the prior art is replaced by the driver and the cam, so that electromagnetic leakage into the environment is avoided, and interference to surrounding electronic equipment is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of automobile power systems, in particular to a gas injector. Background Art

[0002] With the development of vehicle technology, vehicle energy has extended from traditional fossil fuels to clean fuels such as low-carbon or zero-carbon gas. Gas injectors, also known as gas fuel injectors, are responsible for providing fuel to the vehicle power unit in a timely and quantitative manner and are the core functional components of the vehicle power system.

[0003] In the prior art, the gas injector generally controls the flow cross section of the injector by controlling the relative movement of the two armatures of the solenoid valve, thereby controlling the intake volume of the gas injector. However, when the solenoid valve is working, it will generate a strong electromagnetic field, and if the electromagnetic field leaks into the environment, it will interfere with surrounding electronic equipment.

[0004] Therefore, a gas injector is urgently needed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a gas injector to solve the problem in the related art that the solenoid valve in the gas injector generates a strong electromagnetic field when working, and if the electromagnetic field leaks into the environment, it will interfere with surrounding electronic equipment.

[0006] In one aspect, the present invention provides a gas injector comprising:

[0007] A housing is provided with a valve cavity and an air inlet and an air outlet arranged on both sides of the valve cavity along a preset direction, wherein the air inlet and the air outlet are respectively connected to the valve cavity;

[0008] The valve core mechanism includes a plunger assembly, a cam and a driver. The plunger assembly can undergo elastic deformation along the preset direction. The plunger assembly is slidably arranged in the valve cavity along the preset direction. One end of the plunger assembly abuts against the inner wall of the valve cavity and closes the air inlet passage. The cam is arranged in the valve cavity and rotatably cooperates with the shell. The peripheral wall of the cam abuts against the other end of the plunger assembly. The driver drives the cam to rotate, and the rotating shaft of the cam is perpendicular to the preset direction.

[0009] As a preferred technical solution for the gas injector, the valve core mechanism also includes a fixed block, which is arranged in the valve cavity and fixed relative to the housing along the preset direction. The fixed block is provided with a sliding cavity and a first opening connected to the sliding cavity. The cam is located in the sliding cavity and rotatably cooperates with the fixed block. The other end of the plunger assembly extends into the sliding cavity from the first opening and abuts against the peripheral wall of the cam. The gas entering the valve cavity from the inlet duct can pass through the fixed block and flow out from the exhaust duct.

[0010] As a preferred technical solution of the gas injector, the valve core mechanism further includes a first sealing member, which is arranged at the first opening and is used to close the gap between the plunger assembly and the fixed block, and the plunger assembly is slidably matched with the first sealing member;

[0011] The sliding cavity is filled with lubricating grease.

[0012] As a preferred technical solution for the gas injector, the valve core mechanism also includes a valve needle assembly, which includes a valve needle, a first elastic member and a limit member, the valve needle includes a rod portion and a sealing portion, the rod portion is inserted into the exhaust duct and is spaced apart from the interior of the exhaust duct, one end of the rod portion is located outside the valve cavity and is fixedly connected to the sealing portion, the limit member is located in the valve cavity and is fixedly connected to the rod portion, the first elastic member is arranged between the limit member and the exhaust duct, and the two ends of the first elastic member along the preset direction are respectively abutted against the limit member and the inner wall of the valve cavity.

[0013] As a preferred technical solution of the gas injector, the fixed block is further provided with a second opening connected to the sliding cavity along the preset direction, and the other end of the rod extends into the sliding cavity from the second opening and abuts against the peripheral wall of the cam;

[0014] The valve core mechanism further includes a second sealing member, which is disposed at the second opening and is used to close the gap between the rod and the fixing block, and the rod is slidably fitted relative to the second sealing member.

[0015] As a preferred technical solution for the gas injector, the plunger assembly includes a plunger seat, a second elastic member and a plunger rod, one end of the plunger rod abuts against the inner wall of the valve chamber and closes the air inlet passage, the other end of the plunger rod abuts against one end of the second elastic member, the other end of the second elastic member abuts against one end of the plunger seat, and the other end of the plunger seat abuts against the peripheral wall of the cam.

[0016] As a preferred technical solution of the gas injector, the plunger seat is provided with a guide blind hole along the preset direction, the second elastic member is arranged in the guide blind hole, and the plunger rod extends into the guide blind hole and abuts against the elastic member.

[0017] As a preferred technical solution of the gas injector, a support ring is convexly provided on the inner wall of the valve cavity, the axial direction of the support ring is arranged along the preset direction, an annular oil groove is concavely provided on the inner peripheral wall of the support ring, lubricating grease is arranged in the annular oil groove, and the plunger assembly is penetrated through the support ring and is gap-matched with the inner peripheral wall of the support ring;

[0018] The support ring is provided with a first vent hole along the preset direction, and the gas entering the valve cavity from the air inlet can pass through the support ring through the first vent hole.

[0019] As a preferred technical solution for the gas injector, the shell includes an upper shell, a lower shell and an air inlet connector, the upper shell is provided with a first cavity and a first interface and a second interface connected to the first cavity along the preset direction, the air inlet connector extends into the first interface and is screwed to the upper shell, the air inlet duct is located at the air inlet connector, the lower shell is provided with a second cavity and a third interface connected to the second cavity along the preset direction and the exhaust duct, one end of the upper shell away from the air inlet connector is inserted into the third interface and is screwed to the lower shell, and the first cavity and the second cavity enclose the valve cavity.

[0020] As a preferred technical solution of the gas injector, the fixing block is arranged in the second cavity, and along the preset direction, one end of the fixing block abuts against the lower shell, and the other end of the fixing block abuts against the upper shell;

[0021] The fixing block is provided with a second vent hole along the preset direction, and the gas entering the valve cavity from the air inlet can pass through the fixing block through the second vent hole.

[0022] The beneficial effects of the present invention are:

[0023] The present invention provides a gas injector, which includes a shell and a valve core mechanism, wherein the shell is provided with a valve cavity and an air inlet and an air exhaust passage arranged on both sides of the valve cavity along a preset direction, and the air inlet and the air exhaust passage are respectively communicated with the valve cavity; the valve core mechanism includes a plunger assembly, a cam and a driver, the plunger assembly can undergo elastic deformation along a preset direction, the plunger assembly is slidably arranged in the valve cavity along the preset direction, one end of the plunger assembly abuts against the inner wall of the valve cavity and closes the air inlet, the cam is arranged in the valve cavity and rotatably cooperates with the shell, the peripheral wall of the cam abuts against the other end of the plunger assembly, the driver drives the cam to rotate, and the rotating shaft of the cam is perpendicular to the preset direction. In the gas injector, as the cam rotates, the plunger assembly deforms along a preset direction. When the maximum radius of the cam is in line with the plunger assembly, the compression of the plunger assembly along the preset direction is the largest. At this time, the external gas cannot overcome the elastic force of the plunger assembly, and thus the air inlet and the valve cavity cannot be connected, and the gas cannot enter the valve cavity through the air inlet. When the cam continues to rotate from the position where the maximum radius of the cam is in line with the plunger assembly, the compression of the plunger assembly along the preset direction gradually decreases, and the gas can push the plunger assembly to elastically deform, so that the other end of the plunger assembly opens the air inlet, so that the gas can enter the valve cavity through the air inlet, and then eject from the exhaust duct. The gas injector drives the plunger assembly through a combination of a driver and a cam, so that the plunger assembly closes or opens the air inlet. This setting replaces the solenoid valve in the gas injector in the prior art through the driver and the cam, thereby avoiding electromagnetic leakage into the environment and interfering with surrounding electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a gas injector according to an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the assembly of the upper housing and the valve core mechanism in an embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of the assembly of the lower housing and the valve core mechanism in an embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the upper shell in an embodiment of the present invention;

[0028] Figure 5 Schematic diagram of the structure of the fixed block in the embodiment of the present invention.

[0029] In the figure:

[0030] a. Preset direction;

[0031] 1. Shell; 11. Upper shell; 111. First cavity; 112. Support ring; 1121. Annular oil groove; 1122. First vent hole; 113. Annular protrusion; 12. Lower shell; 121. Second cavity; 122. Exhaust duct; 13. Intake joint; 131. Intake duct; 14. Second gasket;

[0032] 21. Plunger assembly; 211. Plunger seat; 2111. Guide blind hole; 212. Second elastic member; 213. Plunger rod; 22. Cam; 23. Driver; 231. Servo motor; 232. Closing plate; 24. Fixed block; 241. Sliding cavity; 242. Second vent hole; 243. Lubricating fluid channel; 25. First sealing member; 251. First retaining ring; 252. First sealing ring; 26. Valve needle assembly; 261. Valve needle; 2611. Rod; 2612. Sealing member; 262. First elastic member; 263. Limiting member; 264. First gasket; 27. Second sealing member; 271. Second retaining ring; 272. Second sealing ring. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] like Figure 1 to Figure 5 As shown, this embodiment provides a gas injector, which includes a shell 1 and a valve core mechanism. The shell 1 is provided with a valve cavity and an air inlet 131 and an exhaust 122 arranged on both sides of the valve cavity along a preset direction a. The air inlet 131 and the exhaust 122 are respectively connected to the valve cavity; the valve core mechanism includes a plunger assembly 21, a cam 22 and a driver 23. The plunger assembly 21 can undergo elastic deformation along the preset direction a. The plunger assembly 21 is slidably arranged in the valve cavity along the preset direction a. One end of the plunger assembly 21 abuts against the inner wall of the valve cavity and closes the air inlet 131. The cam 22 is arranged in the valve cavity and rotatably cooperates with the shell 1. The peripheral wall of the cam 22 abuts against the other end of the plunger assembly 21. The driver 23 drives the cam 22 to rotate, and the rotating shaft of the cam 22 is perpendicular to the preset direction a. In the gas injector, as the cam 22 rotates, the plunger assembly 21 is deformed along the preset direction a. When the maximum radius of the cam 22 is collinear with the plunger assembly 21, the compression of the plunger assembly 21 along the preset direction a is maximum. At this time, the external gas cannot overcome the elastic force of the plunger assembly 21, and thus cannot connect the air inlet 131 and the valve cavity, and the gas cannot enter the valve cavity through the air inlet 131; when the cam 22 continues to rotate from the position where the maximum radius of the cam 22 is collinear with the plunger assembly 21, the compression of the plunger assembly 21 along the preset direction a gradually decreases. At this time, the gas can push the plunger assembly 21 to undergo elastic deformation, so that the other end of the plunger assembly 21 opens the air inlet 131, so that the gas can enter the valve cavity through the air inlet 131, and then be ejected from the exhaust duct 122. The gas injector drives the plunger assembly 21 through a combination of a driver 23 and a cam 22, thereby causing the plunger assembly 21 to close or open the air inlet 131. This arrangement replaces the solenoid valve in the gas injector in the prior art through the driver 23 and the cam 22, thereby avoiding electromagnetic leakage into the environment and interfering with surrounding electronic equipment.

[0038] Optionally, the valve core mechanism further includes a fixed block 24, which is disposed in the valve cavity and fixed relative to the housing 1 along a preset direction a, and the fixed block 24 is provided with a sliding cavity 241 and a first opening connected to the sliding cavity 241, and the cam 22 is located in the sliding cavity 241 and is rotatably matched with the fixed block 24, and the other end of the plunger assembly 21 extends into the sliding cavity 241 from the first opening and abuts against the peripheral wall of the cam 22, and the gas entering the valve cavity from the inlet passage 131 can pass through the fixed block 24 and flow out from the exhaust passage 122. In this embodiment, the fixed block 24 is provided with a mounting hole perpendicular to the preset direction a, one end of the mounting hole is connected to the sliding cavity 241, and a supporting hole is provided on the inner wall of the sliding cavity 241 opposite to the mounting hole, and the driver 23 extends into the mounting hole from the other end of the mounting hole, and one end of the rotating shaft of the cam 22 is installed in the supporting hole through a bearing, and the output shaft of the driver 23 is drivingly connected to the other end of the rotating shaft of the cam 22, and this arrangement enables the rotating shaft of the cam 22 to be arranged perpendicular to the preset direction a.

[0039] In addition, the gas entering the valve cavity from the air inlet 131 can pass through the fixed block 24 and flow out from the exhaust duct 122. This arrangement can prevent the fixed block 24 from obstructing the gas entering the valve cavity from the air inlet 131 from flowing out from the exhaust duct 122. Specifically, a second air vent 242 can be provided on the fixed block 24 along a preset direction a, and the gas entering the valve cavity from the air inlet 131 can pass through the fixed block 24 through the second air vent 242. In other embodiments, the fixed block 24 can also be spaced apart from the cavity wall of the valve cavity. Specifically, at least two second air vents 242 are provided, and at least two second air vents 242 are spaced apart around the circumference of the fixed block.

[0040] Optionally, the driver 23 includes a servo motor 231 and a sealing plate 232. The servo motor 231 is disposed in the mounting hole. The sealing plate 232 is respectively fixed to the fixing block 24 and the servo motor 231. The sealing plate 232 seals the other end of the mounting hole. Specifically, the servo motor 231 can achieve very precise positioning and motion control, has high-precision closed-loop control, and can overcome the problem of stepping out of step of the stepping motor.

[0041] Optionally, the valve core mechanism further includes a first sealing member 25, which is arranged at the first opening and used to close the gap between the plunger assembly 21 and the fixed block 24, and the plunger assembly 21 is slidably matched with the first sealing member 25; the sliding cavity 241 is filled with lubricating grease. In this embodiment, the sliding cavity 241 is provided with a first clamping groove at the position of the first opening, and the first clamping groove is arranged around a preset direction a. The first sealing member 25 includes a first clamping ring 251 and a first sealing ring 252, and the first clamping ring 251 is clamped in the first clamping groove. The first sealing ring 252 is fixedly connected to the first clamping ring 251, and the first sealing ring 252 is respectively pressed against the inner wall of the sliding cavity 241 and the plunger assembly 21, thereby realizing the sealing of the sliding cavity 241. Lubricating grease is arranged in the sealed sliding cavity 241, and the cam 22 and the plunger assembly 21 can be lubricated to prevent the cam 22, the plunger assembly 21 and the fixed block 24 from rapid wear, so as to improve the durability of the gas injector.

[0042] Optionally, a lubricating fluid channel 243 is provided on the cavity wall of the sliding cavity 241, one end of the lubricating fluid channel 243 is connected to the sliding cavity 241, and the other end is connected to the support hole. This setting can lead the lubricating grease in the sliding cavity 241 into the support hole through the lubricating fluid channel 243. This setting can lubricate the bearings in the support hole to increase the service life of the bearings.

[0043] The plunger assembly 21 can achieve a primary seal of the gas injector. In order to achieve the reliability of the gas injector, a secondary seal is further provided on the gas injector. Optionally, the valve core mechanism also includes a valve needle assembly 26, the valve needle assembly 26 includes a valve needle 261, a first elastic member 262 and a limit member 263, the valve needle 261 includes a rod portion 2611 and a blocking portion 2612, the rod portion 2611 is penetrated through the exhaust passage 122 and is spaced apart from the interior of the exhaust passage 122, one end of the rod portion 2611 is located outside the valve cavity and is fixedly connected to the blocking portion 2612, the limit member 263 is located in the valve cavity and is fixedly connected to the rod portion 2611, the first elastic member 262 is arranged between the limit member 263 and the exhaust passage 122, and the two ends of the first elastic member 262 along the preset direction a are respectively abutted against the limit member 263 and the inner wall of the valve cavity. In this embodiment, the blocking portion 2612 is conical, and the first elastic member 262 drives the limiting member 263 to move in a direction away from the exhaust passage 122. During this process, the blocking portion 2612 is pressed against the hole wall of the exhaust passage 122, thereby closing the exhaust passage 122. This arrangement can prevent the gas in the valve cavity from leaking out of the valve cavity. When the gas pressure in the valve cavity increases to a preset value, the gas in the valve cavity can overcome the elastic force of the first elastic member 262, thereby making the blocking portion 2612 spaced from the exhaust passage 122, thereby making the gas in the valve cavity discharged through the exhaust passage 122. Specifically, the first elastic member 262 is a coil spring, and the first elastic member 262 is sleeved on the rod 2611.

[0044] Optionally, the limiting member 263 is sleeved on the rod 2611 and is screwed to the rod 2611. In this embodiment, the setting can adjust the relative position of the limiting member and the rod 2611 along the preset direction a by rotating the limiting member.

[0045] Optionally, the valve needle assembly 26 further includes a plurality of first gaskets 264, the thickness of the plurality of first gaskets 264 are different, one of the first gaskets 264 is selected to be sleeved on the rod portion 2611 and located between the first elastic member 262 and the exhaust passage 122, and along the preset direction a, one side of the first gasket 264 abuts against the first elastic member 262, and the other side abuts against the inner wall of the valve core near the exhaust passage 122. In this embodiment, since the thickness of the plurality of first gaskets 264 are different, when different first gaskets 264 are arranged between the first elastic member 262 and the exhaust passage 122, the compression amount of the first elastic member 262 is different, and the pressing force between the blocking portion 2612 and the exhaust passage 122 can be adjusted to ensure the stability of the sealing of the exhaust passage 122 by the blocking portion 2612.

[0046] Optionally, the fixed block 24 is further provided with a second opening connected to the slide cavity 241 along the preset direction a, and the other end of the rod 2611 extends from the second opening into the slide cavity 241 and abuts against the peripheral wall of the cam 22; the valve core mechanism further includes a second sealing member 27, which is provided at the second opening and is used to close the gap between the rod 2611 and the fixed block 24, and the rod 2611 slides relative to the second sealing member 27. In this embodiment, the above arrangement enables the cam 22 to drive the valve needle 261 to reciprocate along the preset direction a, thereby enabling the plunger assembly 21 and the valve needle 261 to achieve synchronous movement, when the plunger assembly 21 closes the intake passage 131, the blocking portion 2612 of the valve needle 261 closes the exhaust passage 122, and when the plunger assembly 21 opens the intake passage 131, the blocking portion 2612 of the valve needle 261 opens the exhaust passage 122. Preferably, when one end of the plunger assembly 21 abuts against the peripheral wall of the cam 22 at the maximum radius, the other end of the rod portion 2611 abuts against the peripheral wall of the cam 22 at the minimum radius.

[0047] Optionally, the plunger assembly 21 includes a plunger seat 211, a second elastic member 212 and a plunger rod 213, one end of the plunger rod 213 abuts against the inner wall of the valve cavity and closes the air inlet 131, the other end of the plunger rod 213 abuts against one end of the second elastic member 212, the other end of the second elastic member 212 abuts against one end of the plunger seat 211, and the other end of the plunger seat 211 abuts against the peripheral wall of the cam 22. In this embodiment, the second elastic member 212 allows the plunger seat 211 and the plunger rod 213 to have a movement tendency to move closer to or away from each other, thereby enabling the plunger assembly 21 to undergo elastic deformation. Specifically, the second elastic member 212 is a coil spring, and in other embodiments, the second elastic member 212 may also be an elastic rubber.

[0048] Optionally, the plunger seat 211 is provided with a guide blind hole 2111 along a preset direction a, the second elastic member 212 is provided in the guide blind hole 2111, and the plunger rod 213 extends into the guide blind hole 2111 and abuts against the elastic member. In this embodiment, in order to allow the plunger assembly 21 to only undergo elastic deformation along the preset direction a, a guide blind hole 2111 is recessed along the preset direction a on the plunger seat 211, and the second elastic member 212 and the plunger rod 213 are sequentially inserted into the guide blind hole 2111, so that the plunger rod 213 can only slide relative to the plunger seat 211 along the axial direction of the guide blind hole 2111.

[0049] Optionally, a support ring 112 is convexly provided on the inner wall of the valve cavity, and the axial direction of the support ring 112 is arranged along a preset direction a, and an annular oil groove 1121 is concavely provided on the inner peripheral wall of the support ring 112, and lubricating grease is arranged in the annular oil groove 1121, and the plunger assembly 21 is penetrated by the support ring 112 and is gap-matched with the inner peripheral wall of the support ring 112; the support ring 112 is provided with a first vent hole 1122 along the preset direction a, and the gas entering the valve cavity from the air inlet 131 can pass through the support ring 112 through the first vent hole 1122. In this embodiment, the plunger seat 211 is penetrated by the support ring 112 and is slidably matched with the support ring 112. In this arrangement, the support ring 112 plays a role in limiting the plunger seat 211, so that the limit seat can only slide along the preset direction a. An annular oil groove 1121 is concavely formed on the inner wall of the support ring 112. Lubricating grease is provided in the annular oil groove 1121, which can reduce the friction and wear between the plunger seat 211 and the support ring 112. Specifically, a plurality of annular oil grooves 1121 are provided along a preset direction a.

[0050] Optionally, a plurality of first ventilation holes 1122 are provided, and the plurality of first ventilation holes 1122 are arranged on the support ring 112 around the circumference of the support ring 112 .

[0051] Optionally, the shell includes an upper shell 11, a lower shell 12 and an air inlet connector 13, the upper shell 11 is provided with a first cavity 111 and a first interface and a second interface connected to the first cavity 111 along a preset direction a, the air inlet connector 13 extends into the first interface and is screwed to the upper shell 11, the air inlet duct 131 is located at the air inlet connector 13, the lower shell 12 is provided with a second cavity 121 and a third interface and an exhaust duct 122 connected to the second cavity 121 along a preset direction a, one end of the upper shell 11 away from the air inlet connector 13 is inserted into the third interface and is screwed to the lower shell 12, and the first cavity 111 and the second cavity 121 are surrounded to form a valve cavity. In this embodiment, the upper shell 11 and the lower shell 12 are detachably connected, and this arrangement can facilitate the installation of the valve core mechanism in the valve cavity. The air intake connector 13 is inserted into the first interface of the upper shell 11 and is threadedly connected to the upper shell 11. By rotating the air intake connector 13, the distance between the air intake duct 131 and the exhaust duct 122 along the preset direction a can be adjusted to adjust the tightness of the plunger assembly 21 and the upper shell 11 to ensure that the plunger assembly 21 can seal the air intake duct 131.

[0052] Optionally, an annular protrusion 113 is provided on the inner wall of the first cavity 111 at the first interface, and the shell further comprises a plurality of second gaskets 14, the thickness of the plurality of second gaskets 14 are different, and one second gasket 14 is selected and arranged in the first cavity 111, and along the preset direction a, one side of the second gasket 14 abuts against the annular protrusion 113, and the other side abuts against the air inlet connector 13. In this embodiment. Since the thicknesses of the plurality of second gaskets 14 are different, when different second gaskets 14 are arranged between the annular protrusion 113 and the air inlet connector 13, the spacing between the air inlet duct 131 and the exhaust duct 122 along the preset direction a is also different.

[0053] Optionally, the fixed block 24 is disposed in the second cavity 121, and along the preset direction a, one end of the fixed block 24 abuts against the lower shell 12, and the other end of the fixed block 24 abuts against the upper shell 11; the fixed block 24 is provided with a second vent hole 242 along the preset direction a, and the gas entering the valve cavity from the air inlet 131 can pass through the fixed block 24 through the second vent hole 242. In this embodiment, one end of the fixed block 24 abuts against the lower shell 12, and the other end of the fixed block 24 abuts against the upper shell 11, and this arrangement enables the fixed block 24 to be relatively fixed to the shell 1 along the preset direction a. The second vent hole 242 passes through the fixed block 24 along the preset direction a, and a plurality of second vent holes 242 are provided, and the plurality of second vent holes 242 are arranged at intervals around the axial direction of the sliding cavity 241.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Gas injector, It is characterized in that include: A housing (1) is provided with a valve cavity and an air inlet (131) and an air outlet (122) arranged on both sides of the valve cavity along a preset direction (a), wherein the air inlet (131) and the air outlet (122) are respectively connected to the valve cavity; A valve core mechanism comprises a plunger assembly (21), a cam (22) and a driver (23); the plunger assembly (21) is elastically deformable along the preset direction (a); the plunger assembly (21) is slidably arranged in the valve cavity along the preset direction (a); one end of the plunger assembly (21) abuts against the inner wall of the valve cavity and closes the air inlet (131); the cam (22) is arranged in the valve cavity and rotatably cooperates with the housing (1); the peripheral wall of the cam (22) abuts against the other end of the plunger assembly (21); the driver (23) drives the cam (22) to rotate; and the rotating shaft of the cam (22) is perpendicular to the preset direction (a).

2. The gas injector according to claim 1, It is characterized in that The valve core mechanism also includes a fixed block (24), which is arranged in the valve cavity and fixed relative to the housing (1) along the preset direction (a), and the fixed block (24) is provided with a sliding cavity (241) and a first opening connected to the sliding cavity (241), the cam (22) is located in the sliding cavity (241) and rotatably cooperates with the fixed block (24), the other end of the plunger assembly (21) extends into the sliding cavity (241) from the first opening and abuts against the peripheral wall of the cam (22), and the gas entering the valve cavity from the intake passage (131) can pass through the fixed block (24) and flow out from the exhaust passage (122).

3. The gas injector according to claim 2, It is characterized in that The valve core mechanism further comprises a first sealing member (25), the first sealing member (25) being arranged at the first opening and used for closing a gap between the plunger assembly (21) and the fixing block (24), the plunger assembly (21) being slidably fitted relative to the first sealing member (25); The sliding cavity (241) is filled with lubricating grease.

4. The gas injector according to claim 3, It is characterized in that The valve core mechanism also includes a valve needle assembly (26), the valve needle assembly (26) includes a valve needle (261), a first elastic member (262) and a limit member (263), the valve needle (261) includes a rod portion (2611) and a sealing portion (2612), the rod portion (2611) is inserted into the exhaust passage (122) and is spaced apart from the inside of the exhaust passage (122), one end of the rod portion (2611) is located outside the valve cavity and is fixedly connected to the sealing portion (2612), the limit member (263) is located in the valve cavity and is fixedly connected to the rod portion (2611), the first elastic member (262) is arranged between the limit member (263) and the exhaust passage (122), and the two ends of the first elastic member (262) along the preset direction (a) are respectively in contact with the limit member (263) and the inner wall of the valve cavity.

5. The gas injector according to claim 4, It is characterized in that The fixing block (24) is also provided with a second opening connected to the sliding cavity (241) along the preset direction (a); the other end of the rod portion (2611) extends from the second opening into the sliding cavity (241) and abuts against the peripheral wall of the cam (22); The valve core mechanism also includes a second sealing member (27), which is arranged at the second opening and is used to close the gap between the rod portion (2611) and the fixed block (24), and the rod portion (2611) is slidably matched with the second sealing member (27).

6. The gas injector according to claim 1, It is characterized in that The plunger assembly (21) comprises a plunger seat (211), a second elastic member (212) and a plunger rod (213); one end of the plunger rod (213) abuts against the inner wall of the valve cavity and closes the air inlet passage (131); the other end of the plunger rod (213) abuts against one end of the second elastic member (212); the other end of the second elastic member (212) abuts against one end of the plunger seat (211); and the other end of the plunger seat (211) abuts against the peripheral wall of the cam (22).

7. The gas injector according to claim 6, It is characterized in that The plunger seat (211) is provided with a guide blind hole (2111) along the preset direction (a), the second elastic member (212) is arranged in the guide blind hole (2111), and the plunger rod (213) extends into the guide blind hole (2111) and abuts against the elastic member.

8. The gas injector according to claim 6, It is characterized in that A support ring (112) is convexly provided on the inner wall of the valve cavity, the axial direction of the support ring (112) is arranged along the preset direction (a), an annular oil groove (1121) is concavely provided on the inner peripheral wall of the support ring (112), and lubricating grease is arranged in the annular oil groove (1121), and the plunger assembly (21) is inserted through the support ring (112) and is gap-matched with the inner peripheral wall of the support ring (112); The support ring (112) is provided with a first vent hole (1122) along the preset direction (a), and the gas entering the valve cavity from the air inlet (131) can pass through the support ring (112) through the first vent hole (1122).

9. The gas injector according to claim 2, It is characterized in that The shell (1) comprises an upper shell (11), a lower shell (12) and an air inlet connector (13); the upper shell (11) is provided with a first cavity (111) and a first interface and a second interface connected to the first cavity (111) along the preset direction (a); the air inlet connector (13) extends into the first interface and is screwed to the upper shell (11); the air inlet passage (131) is located at the air inlet connector (13); the lower shell (12) is provided with a second cavity (121) and a third interface connected to the second cavity (121) along the preset direction (a) and the exhaust passage (122); one end of the upper shell (11) away from the air inlet connector (13) is inserted into the third interface and is screwed to the lower shell (12); the first cavity (111) and the second cavity (121) are arranged to form the valve cavity.

10. The gas injector according to claim 9, It is characterized in that The fixing block (24) is arranged in the second cavity (121), and along the preset direction (a), one end of the fixing block (24) abuts against the lower shell (12), and the other end of the fixing block (24) abuts against the upper shell (11); The fixing block (24) is provided with a second vent hole (242) along the preset direction (a), and the gas entering the valve cavity from the air inlet (131) can pass through the fixing block (24) through the second vent hole (242).

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