Gas injection valve

Abstract

The invention relates to a gas injection valve. The device comprises a shell which is provided with an air inlet channel; the exhaust seat is installed on the shell, the exhaust seat comprises a sealing face, a vent hole formed in the sealing face and an exhaust channel static iron core assembly communicated with the vent hole, the static iron core assembly is arranged in the shell, and the static iron core assembly comprises a static iron core and a coil component arranged on the periphery of the static iron core in a surrounding mode; the static iron core assembly is arranged in the shell, the movable iron core assembly is arranged in the shell, the movable iron core assembly is matched with the static iron core assembly and can move relative to the shell, the movable iron core assembly comprises a sealing plug, and the sealing plug comprises a movable iron core and a sealing body installed on the movable iron core; and the sealing body can be in sealing contact with the sealing surface and seal the vent hole. The vibration resistance durability is improved, and the manufacturing cost and the maintenance difficulty are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic valves, in particular to a gas injection valve. Background Art

[0002] As a vehicle fuel, natural gas emits significantly lower pollutants after combustion than vehicles powered by petroleum fuel, and its price is much lower than gasoline and diesel. It can effectively reduce vehicle operating costs, generally saving about 50% of fuel costs and significantly reducing operating expenses.

[0003] The gas injection valve is a key component of a gas engine, responsible for controlling the air intake of the engine. Since the air intake needs to be precisely controlled, this component requires high air tightness. In addition, it is also necessary to ensure that the gas is stably output from the outlet. The nozzle structure in the prior art is relatively complex, and the number of parts involved is large, which makes assembly difficult during system integration, and there are problems such as poor sealing effect, poor reliability, insufficient vibration resistance and durability, and the manufacturing cost is high. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problems of poor sealing effect, poor reliability, insufficient vibration resistance and high manufacturing cost of the gas injection valve in the prior art.

[0005] In order to solve the above technical problems, the present invention provides a gas injection valve, comprising: The housing is provided with an air inlet passage; An exhaust seat, mounted on the housing, the exhaust seat comprising a sealing surface, a vent hole provided on the sealing surface, and an exhaust channel connected to the vent hole; A static iron core assembly is disposed in the housing, and the static iron core assembly includes a static iron core and a coil component disposed around the outer periphery of the static iron core; A moving iron core assembly is arranged in the housing, the moving iron core assembly cooperates with the static iron core assembly and can move relative to the housing, the moving iron core assembly includes a sealing plug, the sealing plug includes a moving iron core and a sealing body installed on the moving iron core, the sealing body can be in sealing contact with the sealing surface and close the vent hole; Wherein, when the moving iron core assembly moves to the first position, the sealing body is in sealing contact with the sealing surface to separate the air intake channel and the exhaust channel; when the moving iron core assembly moves to the second position, the sealing body is separated from the sealing surface to connect the air intake channel and the exhaust channel.

[0006] In one embodiment of the present invention, the moving iron core is in the form of a disk, and the sealing body is embedded in the middle of one end surface of the moving iron core.

[0007] In one embodiment of the present invention, a ring-shaped sink groove is arranged on the central axis of the moving iron core at one end of the moving iron core away from the sealing body.

[0008] In one embodiment of the present invention, it also includes a first axial through hole that penetrates axially to the middle of the moving iron core and the middle of the sealing body, and the side wall of the static iron core is provided with a radial through hole. When the sealing body is separated from the sealing surface, the air inlet channel can be connected with the first axial through hole through the radial through hole.

[0009] In one embodiment of the present invention, a plurality of second axial through holes are distributed on the end surface of the moving iron core with its central axis as the center, and when the sealing body is separated from the sealing surface, the air inlet channel can be connected to the air vent through the second axial through hole.

[0010] In one embodiment of the present invention, a travel ring is provided outside the moving iron core, and the sealing body comprises an elastic rubber body.

[0011] In one embodiment of the present invention, the moving iron core assembly includes a spring adjustment rod and a spring installed in the inner hole of the static iron core, wherein both ends of the spring are respectively connected to the spring adjustment rod and the sealing plug, and the spring is used to provide a force to move the sealing plug away from the spring adjustment rod.

[0012] In one embodiment of the present invention, an inner coil O-ring is provided between the static iron core and the coil component, an outer coil O-ring is provided between the coil component and the outer shell, a spring adjustment rod O-ring is provided between the spring adjustment rod and the inner hole of the static iron core, a shell O-ring is provided on the outer shell, an exhaust seat inner O-ring is provided between the exhaust seat and the outer shell, and an exhaust seat outer O-ring is provided on the exhaust seat outer shell.

[0013] In one embodiment of the present invention, a plurality of the air inlet passages are circumferentially distributed on the side wall of the outer shell, and the outer shell cover is provided with a filter covering the air inlet passages.

[0014] In one embodiment of the present invention, the outer shell is threadedly connected to a plug-in plastic seal that abuts against the coil component, and the plug-in plastic seal is installed with a dust cap covering one end of the static iron core.

[0015] The above technical solution of the present invention has the following advantages compared with the prior art: The gas injection valve described in the present invention can achieve precise control of gas intake and exhaust through the cooperation of the static iron core and the moving iron core assembly. By setting the seal body and the sealing surface to cooperate closely, the effective isolation and connection of the intake channel and the exhaust channel are guaranteed, and the stability and accuracy of the gas flow are ensured. The present invention reduces the number of parts and simplifies the overall structural design of the injection valve, making the system integration process more convenient, reducing the difficulty and time cost of assembly, and at the same time, the reduction in the number of parts also reduces the manufacturing cost and maintenance difficulty.

[0016] The present invention takes into account the anti-vibration durability performance, reduces the contact area between the sealing plug and the shell by arranging the sink groove, quickly releases the electromagnetic force, reduces the influence of vibration on the system, and thus prolongs the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0018] Figure 1 It is a cross-sectional structural diagram of the gas injection valve of the present invention.

[0019] Figure 2 yes Figure 3 A local enlarged structural diagram at position Z in the middle.

[0020] Figure 3 It is a gas flow structure diagram of the gas injection valve of the present invention.

[0021] Figure 4 It is an exploded structural diagram of the gas injection valve of the present invention.

[0022] Figure 5 It is a cross-sectional structural diagram of the sealing plug of the present invention.

[0023] Figure 6 It is the axial side structural diagram of the sealing plug of the present invention.

[0024] Figure 7 It is a cross-sectional structural diagram of the exhaust seat of the present invention.

[0025] Figure 8 It is a top view of the exhaust seat of the present invention.

[0026] Description of the Figures in the Specification: 100, static iron core assembly; 200, moving iron core assembly; 1. Coil component; 2. Static iron core; 2-1. Radial through hole; 3. Shell; 3-1. Inlet passage; 4. Sealing plug; 4-1. Moving iron core; 4-2. Sealing body; 4-3. Sink; 4-4. First axial through hole; 4-5. Second axial through hole; 5. Travel ring; 6. Exhaust seat; 6-1. Sealing surface; 6-2. Air vent; 6-3. Exhaust passage; 7. Spring adjustment rod; 7-1. Boss; 7-2. Grading hole; 8. Spring; 9. Plug-in plastic sealing; 10. Cap; 11. Filter; 12. O-ring inside the coil; 13. O-ring outside the coil; 14. O-ring of spring adjustment rod; 15. O-ring of shell; 16. O-ring inside the exhaust seat; 17. O-ring outside the exhaust seat. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0028] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0029] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0031] Reference Figure 1 , Figure 7 , Figure 8 As shown, a gas injection valve of the present invention comprises: The housing 3 is provided with an air inlet passage 3-1; An exhaust seat 6 is installed on the housing 3, and the exhaust seat 6 includes a sealing surface 6-1, a vent hole 6-2 provided on the sealing surface 6-1, and an exhaust channel 6-3 connected to the vent hole 6-2; The static iron core assembly 100 is disposed in the housing 3, and the static iron core assembly 100 includes a static iron core 2 and a coil component 1 disposed around the outer periphery of the static iron core 2; The moving iron core assembly 200 is arranged in the housing 3. The moving iron core assembly 200 cooperates with the static iron core assembly 100 and can move relative to the housing 3. The moving iron core assembly 200 includes a sealing plug 4. The sealing plug 4 includes a moving iron core 4-1 and a sealing body 4-2 installed on the moving iron core 4-1. The sealing body 4-2 can be in sealing contact with the sealing surface 6-1 and close the vent hole 6-2. Among them, when the moving iron core assembly 200 moves to the first position, the sealing body 4-2 is in sealing contact with the sealing surface 6-1 to separate the air intake channel 3-1 and the exhaust channel 6-3; when the moving iron core assembly 200 moves to the second position, the sealing body 4-2 is separated from the sealing surface 6-1 to connect the air intake channel 3-1 and the exhaust channel 6-3.

[0032] In one embodiment, referring to Figure 8 As shown, the ventilation hole 6-2 is in a waist shape with an arc, and a plurality of ventilation holes 6-2 are distributed around the central axis of the sealing surface 6-1.

[0033] In one embodiment, referring to Figure 5 As shown, the moving iron core 4-1 is in the form of a disk, and the sealing body 4-2 is embedded in the middle of one end surface of the moving iron core 4-1.

[0034] Reference Figure 6 As shown, a receiving cavity for receiving the sealing plug 4 is formed between the housing 3 and the exhaust seat 6, and a ring-shaped sinking groove 4-3 is arranged on the central axis of the moving iron core 4-1 at one end of the moving iron core 4-1 away from the sealing body 4-2. The sinking groove 4-3 can reduce the contact area with the housing 3, so as to achieve the purpose of quick release of electromagnetic force.

[0035] In one embodiment, referring to Figure 3 As shown, it also includes a first axial through hole 4-4 that axially penetrates along the middle of the moving iron core 4-1 and the middle of the sealing body 4-2. The side wall of the static iron core 2 is provided with a radial through hole 2-1. When the sealing body 4-2 is separated from the sealing surface 6-1, the air intake channel 3-1 can be connected with the first axial through hole 4-4 through the radial through hole 2-1.

[0036] In one embodiment, referring to Figure 6As shown, a plurality of second axial through holes 4-5 are distributed on the end face of the moving iron core 4-1 with its central axis as the center. When the sealing body 4-2 is separated from the sealing surface 6-1, the air inlet channel 3-1 can be connected with the air vent 6-2 through the second axial through hole 4-5.

[0037] In one embodiment, referring to Figure 1 As shown, the movable iron core 4-1 is equipped with a travel ring 5 outside, the travel ring 5 is arranged in the accommodating cavity, and forms a movement stroke with the height difference of the sealing plug 4, and the sealing body 4-2 includes an elastic rubber body, which can perform a good sealing cooperation with the sealing surface 6-1 of the exhaust seat 6.

[0038] In one embodiment, referring to Figure 2 As shown, the moving iron core assembly 200 includes a spring adjustment rod 7 and a spring 8 installed in the inner hole of the static iron core 2, and the two ends of the spring 8 are respectively connected to the spring adjustment rod 7 and the sealing plug 4, and the spring 8 is used to provide a force for the sealing plug 4 to move away from the spring adjustment rod 7. The end of the spring adjustment rod 7 that contacts the spring 8 has a boss 7-1, and the inner hole of the inner hole of the static iron core 2 is a graded hole 7-2, which has a dual positioning function and better reliability.

[0039] It can be understood that the spring adjustment rod 7 can adjust the force of the spring 8; the static iron core 2, the housing 3, and the sealing plug 4 (moving iron core 4-1) form a magnetic circuit closed loop.

[0040] In one embodiment, referring to Figure 2 As shown, a coil inner O-ring 12 is provided between the static iron core 2 and the coil component 1, a coil outer O-ring 13 is provided between the coil component 1 and the outer shell 3, a spring adjusting rod 7 O-ring is provided between the spring adjusting rod 7 and the inner hole of the static iron core 2, a shell O-ring 15 is provided on the outer shell 3, an exhaust seat inner O-ring 16 is provided between the exhaust seat 6 and the outer shell 3, and an exhaust seat outer O-ring 17 is provided on the outer shell of the exhaust seat 6.

[0041] The sealing body 4-2 of the gas injection valve is made of elastic rubber, which is in good contact with the sealing surface 6-1 of the exhaust seat 6, ensuring the improvement of air tightness. The design of multiple O-rings further improves the overall sealing performance, effectively prevents gas leakage, and enhances the reliability of the injection valve.

[0042] In one embodiment, referring to Figure 1 As shown, the plurality of air inlet channels 3-1 are circumferentially distributed on the side wall of the shell 3, and the shell 3 is provided with a filter 11 covering the air inlet channels 3-1, which can effectively filter impurities in the fuel gas and prevent impurities from entering the valve body, thereby extending the service life of the valve and ensuring the normal operation of the system.

[0043] In one embodiment, referring to Figure 1 As shown, the housing 3 is threadedly connected with a plug-in plastic seal 9 that abuts against the coil component 1. The plug-in plastic seal 9 is used to fix the wire rack and provide an electrical connector. The plug-in plastic seal 9 is installed with a dust cap 10 covering one end of the static iron core 2.

[0044] Working principle: When the coil component 1 is not energized, the sealing plug 4 is subject to the spring force of the spring 8 and moves away from the housing 3. The elastic rubber body below the sealing plug 4 presses on the sealing surface 6-1 of the exhaust seat 6 to form a seal. At this time, the air path is closed and no gas is discharged from the bottom of the exhaust seat 6.

[0045] When the coil component 1 is energized, the moving iron core 4-1 in the sealing plug 4 acts as a magnetic conductor. Under the influence of the electromagnetic force in the magnetic circuit, it overcomes the force of the spring 8 and rises to contact the outer shell 3. At this time, the elastic rubber body below the sealing plug 4 is away from the sealing surface 6-1 of the exhaust seat 6. At this time, the gas path is in an open state, and the gas enters from the side of the gas injection valve, passes through the filter 11, the intake channel 3-1, the static iron core 2 / sealing plug 4, and is discharged from the bottom intake channel 3-1 of the exhaust seat 6.

[0046] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A gas injection valve, characterized in that: include: The housing (3) is provided with an air intake passage (3-1); An exhaust seat (6) mounted on the housing (3), the exhaust seat (6) comprising a sealing surface (6-1), an air vent (6-2) disposed on the sealing surface (6-1), and an exhaust channel (6-3) communicating with the air vent (6-2); A static iron core assembly (100) is arranged in the housing (3), the static iron core assembly (100) comprising a static iron core (2) and a coil component (1) arranged around the outer periphery of the static iron core (2); A moving iron core assembly (200) is arranged in the housing (3); the moving iron core assembly (200) cooperates with the static iron core assembly (100) and is movable relative to the housing (3); the moving iron core assembly (200) comprises a sealing plug (4); the sealing plug (4) comprises a moving iron core (4-1) and a sealing body (4-2) mounted on the moving iron core (4-1); the sealing body (4-2) is capable of sealingly contacting the sealing surface (6-1) and closing the vent hole (6-2); When the moving iron core assembly (200) moves to a first position, the sealing body (4-2) is in sealing contact with the sealing surface (6-1) so that the air intake passage (3-1) and the exhaust passage (6-3) are isolated; when the moving iron core assembly (200) moves to a second position, the sealing body (4-2) is separated from the sealing surface (6-1) so that the air intake passage (3-1) and the exhaust passage (6-3) are connected.

2. A gas injection valve according to claim 1, characterized in that: The moving iron core (4-1) is in the form of a disk, and the sealing body (4-2) is embedded in the middle of one end surface of the moving iron core (4-1).

3. A gas injection valve according to claim 2, characterized in that: An annular sink groove (4-3) is arranged on the central axis of the moving iron core (4-1) and is arranged at one end of the moving iron core (4-1) away from the sealing body (4-2).

4. A gas injection valve according to claim 2, characterized in that: It also includes a first axial through hole (4-4) that axially penetrates to the middle of the moving iron core (4-1) and the middle of the sealing body (4-2); a radial through hole (2-1) is provided on the side wall of the stationary iron core (2); when the sealing body (4-2) is separated from the sealing surface (6-1), the air inlet passage (3-1) can be connected to the first axial through hole (4-4) through the radial through hole (2-1).

5. A gas injection valve according to claim 1, characterized in that: A plurality of second axial through holes (4-5) are distributed on the end surface of the moving iron core (4-1) with its central axis as the center, and when the sealing body (4-2) is separated from the sealing surface (6-1), the air inlet channel (3-1) can be connected to the air vent (6-2) through the second axial through hole (4-5).

6. A gas injection valve according to claim 1, characterized in that: The movable iron core (4-1) is fitted with a travel ring (5) outside, and the sealing body (4-2) comprises an elastic rubber body.

7. A gas injection valve according to claim 1, characterized in that: The moving iron core assembly (200) comprises a spring adjustment rod (7) and a spring (8) installed in the inner hole of the stationary iron core (2); two ends of the spring (8) are respectively connected to the spring adjustment rod (7) and the sealing plug (4); the spring (8) is used to provide a force to move the sealing plug (4) away from the spring adjustment rod (7).

8. A gas injection valve according to claim 7, characterized in that: An inner coil O-ring (12) is provided between the static iron core (2) and the coil component (1), an outer coil O-ring (13) is provided between the coil component (1) and the outer shell (3), a spring adjustment rod (7) O-ring is provided between the spring adjustment rod (7) and the inner hole of the static iron core (2), a shell O-ring (15) is provided on the outer shell of the outer shell (3), an inner exhaust seat O-ring (16) is provided between the exhaust seat (6) and the outer shell (3), and an outer exhaust seat O-ring (17) is provided on the outer shell of the exhaust seat (6).

9. A gas injection valve according to claim 1, characterized in that: The plurality of air inlet passages (3-1) are circumferentially distributed on the side wall of the outer shell (3), and the outer shell (3) is covered with a filter screen (11) covering the air inlet passages (3-1).

10. A gas injection valve according to claim 1, characterized in that: The outer shell (3) is threadedly connected to a plug-in plastic seal (9) that abuts against the coil component (1), and the plug-in plastic seal (9) is installed with a dustproof cap (10) that covers one end of the static iron core (2).

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