Solenoid valve

Abstract

The utility model provides an electromagnetic valve which comprises a push rod capable of moving between a first position and a second position in the axial direction of the electromagnetic valve. The sealing gasket is only arranged at one axial end of the push rod; the valve seat is provided with a first flow channel opening and a second flow channel opening, the first flow channel opening is communicated with the second flow channel opening, the valve seat is provided with a sealing surface, and the sealing surface is arranged on one axial side of the sealing gasket; the push rod limiting part is arranged on the other axial side of the sealing gasket, when the push rod is in the first position, the push rod blocks communication between the first flow channel opening and the second flow channel opening, the upper end face of the sealing gasket makes contact with the sealing face, and when the push rod is in the second position, the lower end face of the sealing gasket makes contact with the push rod limiting part.

Description

Technical Field

[0001] This application relates to the field of valve assembly technology, and in particular to a solenoid valve. Background Technology

[0002] In existing technologies, solenoid valves use rubber for axial sealing, and rubber components are also required for vibration damping. EP3124840A1 (see also US20170030475A1) discloses a solenoid valve in which rubber components are provided at both ends of the push rod along the axial direction. These rubber components need to be vulcanized and bonded at both ends of the push rod, resulting in a complex structure and high cost. Furthermore, the dynamic sealing structure is complex, with high sliding friction. If the parts are misaligned, gas leakage may occur, leading to solenoid valve malfunction. Utility Model Content

[0003] This application aims to provide a solenoid valve that simplifies the sealing structure and reduces costs.

[0004] This application discloses a solenoid valve, comprising:

[0005] A push rod, which is movable along the axial direction of the solenoid valve between a first position and a second position;

[0006] A sealing gasket, wherein the sealing gasket is only provided at one axial end of the push rod;

[0007] A valve seat, wherein the valve seat is provided with a first flow channel and a second flow channel, the first flow channel and the second flow channel are connected, and the valve seat is provided with a sealing surface, the sealing surface being disposed on one axial side of the sealing gasket; and

[0008] A push rod limiting part is disposed on the other side of the sealing gasket along its axial direction.

[0009] With the push rod in the first position, the push rod blocks the communication between the first flow channel and the second flow channel, and the upper end face of the sealing gasket contacts the sealing surface.

[0010] When the push rod is in the second position, the lower end face of the sealing gasket contacts the push rod limiting portion.

[0011] In at least one possible implementation, the push rod has a radial protrusion at one axial end, the radial protrusion protruding radially out of the main body of the push rod along the solenoid valve, and the sealing gasket covers at least two axial end faces of the radial protrusion.

[0012] In at least one possible implementation, the sealing surface is inclined relative to the cross-section of the solenoid valve, and the radially inner side of the sealing surface is closer to the sealing gasket than the radially outer side.

[0013] In at least one possible implementation, the radially inner side of the sealing surface extends to the first flow channel opening, the sealing surface and the first flow channel opening are smoothly transitioned by a chamfer, the chamfer and the sealing gasket are located in the same radial region, and the chamfer and the sealing gasket are in contact when the push rod is in the first position.

[0014] In at least one possible implementation, the push rod is fitted with a sealing ring, the sealing ring comprising a sealing body and an elastic body, the sealing body being annular and having a receiving cavity, the elastic body being disposed within the receiving cavity, the elastic body being configured to be compressibly deformed along the radial direction of the solenoid valve.

[0015] In at least one possible implementation, the elastomer is a V-shaped spring, the tip and open end of which are arranged opposite to each other along the axial direction of the solenoid valve.

[0016] In at least one possible implementation, two V-shaped springs are provided, arranged axially along the solenoid valve, and mounted on the same sealing body.

[0017] In at least one possible implementation, the tips of the two V-shaped springs are positioned opposite each other, with the open ends of the two V-shaped springs facing the axial sides of the solenoid valve.

[0018] In at least one possible implementation, the elastomer is made of metal, the seal is made of an elastic material, and the elastomer is partially bonded to or partially embedded in the seal.

[0019] In at least one possible implementation, the solenoid valve further includes a coil and an armature, the coil being sleeved on the armature, and the push rod being connected to the armature. When the coil is energized, it can drive the armature to move the push rod.

[0020] The armature is provided with a first compression spring and a second compression spring at its two axial ends, and the first compression spring and the second compression spring can apply forces in opposite directions to the armature.

[0021] By adopting the above technical solution, a sealing gasket can be set at only one axial end of the push rod to seal the gap between the push rod and the valve seat. It also buffers and reduces noise during the movement of the push rod. The sealing gasket has high integration, simple structure, and low cost. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of a solenoid valve according to one embodiment of this application is shown.

[0023] Figure 2It shows Figure 1 A magnified view of a portion of the image.

[0024] Figure 3 A partial structural schematic diagram of a solenoid valve according to another embodiment of this application is shown.

[0025] Explanation of reference numerals in the attached figures

[0026] 1 Valve seat 11 First flow channel port 12 Second flow channel port 13 Sealing surface 14 Chamfer

[0027] 2 shells

[0028] 3 armatures 31 First compression spring 32 Second compression spring

[0029] 4 push rods 41 radial protrusion

[0030] 5. Sealing gasket 51. Upper end face 52. Lower end face

[0031] 6 coil, 61 coil fixing piece, 62 pole piece

[0032] 7 Pad 71 Push Rod Limiting Section

[0033] 8. Sealing ring; 81. Sealing body; 82. Elastomer

[0034] Axial direction R radial direction Detailed Implementation

[0035] To more clearly illustrate the above-mentioned objectives, features, and advantages of this application, specific embodiments of this application are described in detail in conjunction with the accompanying drawings in this section. Besides the embodiments described in this section, this application can also be implemented in other different ways. Those skilled in the art can make corresponding improvements, modifications, and substitutions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application should be determined by the claims.

[0036] like Figures 1 to 2 As shown, one embodiment of this application proposes a solenoid valve, which can be a switching valve for a dual-chamber air spring. Specifically, the stiffness of the air spring can be adjusted by opening or closing the solenoid valve. The solenoid valve includes a valve seat 1, a housing 2, an armature 3, a push rod 4, a sealing gasket 5, a coil 6, a liner 7, and a sealing ring 8.

[0037] The housing 2 can be cylindrical, and the armature 3, push rod 4, coil 6, and gasket 7 are at least partially disposed inside the housing 2. The sealing ring 8 can be fixedly installed to the gasket 7.

[0038] Valve seat 1 can be approximately cylindrical, with one axial end of valve seat 1 ( Figure 1The upper end of the valve seat 1 can be provided with a first flow channel 11, and the peripheral wall of the valve seat 1 can be provided with a second flow channel 12. The first flow channel 11 and the second flow channel 12 are interconnected.

[0039] The coil 6 can be sleeved on the radial outer side of the coil fixing member 61, which is connected to the housing 2. The coil fixing member 61 can be cylindrical. The pole piece 62 can be connected to the coil fixing member 61 and can be electrically connected to the coil 6, thus supplying power to the coil 6.

[0040] The armature 3 can be located radially inside the coil fixing member 61, and the armature 3 can move relative to the coil fixing member 61 along the axial direction A of the solenoid valve. The gasket 7 can be cylindrical, and the gasket 7 can be sleeved on the push rod 4. The gasket 7 can be fixedly connected to the valve seat 1, and the gasket 7 can be located at one axial end of the armature 3. Figure 1 (the upper part of the middle).

[0041] A first compression spring 31 and a second compression spring 32 are respectively provided at both ends of the armature 3 along its axial direction. The first compression spring 31 and the second compression spring 32 can apply forces in opposite directions to the armature 3. Through the combined action of the first compression spring 31 and the second compression spring 32, the armature 3 can be balanced in a predetermined position (second position) when it is not subjected to the electromagnetic force applied by the coil 6.

[0042] Specifically, the first compression spring 31 can be located below the armature 3, and can be disposed between the end of the coil fixing member 61 and the armature 3. The first compression spring 31 has a tendency to move the armature 3 upward. The first compression spring 31 can be a conical spring. The second compression spring 32 can be located above the armature 3, and can be disposed between the armature 3 and the pad 7. The second compression spring has a tendency to move the armature 3 downward.

[0043] The push rod 4 can move relative to the gasket 7 along the axial direction A of the solenoid valve between a first position and a second position. When the push rod 4 is in the first position, the push rod 4 can block the communication between the first flow port 11 and the second flow port 12. When the push rod 4 is in the second position, the first flow port 11 and the second flow port 12 are connected.

[0044] The armature 3 and the push rod 4 can be connected together, for example by threads, so that the armature 3 and the push rod 4 can move together relative to the valve seat 1 or the gasket 7 along the axial direction A. When the coil 6 is energized, an electromagnetic force can be applied to the armature 3, so that the armature 3 can move upward with the push rod 4 against the elastic force of the second compression spring 32.

[0045] The push rod 4 can be a hollow column, and the sealing gasket 5 can be set at one axial end of the push rod 4. Figure 1(Upper middle end). Specifically, a radial protrusion 41 may be provided at one axial end of the push rod 4, and the radial protrusion 41 may protrude radially R from the outer circumferential surface of the main body of the push rod 4.

[0046] The sealing gasket 5 can be made of an elastic sealing material such as rubber. The sealing gasket 5 can be connected to the radial protrusion 41, and the sealing gasket 5 can at least cover both end faces on the axial direction A of the radial protrusion 41 (it can, but does not have to, cover the entire end face), thereby achieving contact between the push rod 4 and the valve seats 1 and the gasket 7 on both sides of its axial direction through the sealing gasket 5. The gasket 7 can be provided with a push rod limiting part 71, which is provided on the other side of the axial direction of the sealing gasket 5.

[0047] When the solenoid valve is energized, armature 3 carries push rod 4 to one axial direction. Figure 1 The push rod 4 is moved to the first position, blocking the connection between the first flow channel 11 and the second flow channel 12. The upper end face 51 of the sealing gasket 5 can be in close contact with the valve seat 1. By contacting and deforming the sealing gasket 5 with the valve seat 1, the connection between the first flow channel 11 and the second flow channel 12 can be blocked and a seal can be achieved.

[0048] When the solenoid valve is de-energized, armature 3 carries push rod 4 to the other side of the axial direction. Figure 1 When the push rod 4 moves to the lower middle position, the second compression spring 32 puts the push rod 4 in the second position, and the lower end face 52 of the sealing gasket 5 contacts the push rod limiting part 71. The sealing gasket 5 can play a buffering and shock absorption role, avoiding noise caused by direct collision between metal parts (push rod 4 and gasket 7).

[0049] In this embodiment, the sealing gasket 5 is integrally molded, which simplifies the structure, facilitates assembly, and reduces costs. In other possible embodiments, two separate sealing gaskets may be installed on opposite axial sides of the radial protrusion, thereby forming seals with the valve seat 1 and the gasket 7 respectively.

[0050] A single sealing gasket 5 can seal the gap between the push rod 4 and the valve seat 1, and it can also buffer and reduce noise during the movement of the push rod 4. The sealing gasket 5 has a high degree of integration, simple structure, and low cost.

[0051] The sealing ring 8 can be fitted on the radial outer side of the push rod 4. The sealing ring 8 is used to seal the gap between the push rod 4 and the gasket 7 (valve seat 1).

[0052] It is understood that in this embodiment, the outer peripheral surface of the sealing ring 8 only mates with the gasket 7. However, in other possible embodiments, since the specific connection structure between the gasket 7 and the valve seat 1 may be different from that in this application, the outer peripheral surface of the sealing ring 8 may mate with both the gasket 7 and the valve seat 1.

[0053] The sealing ring 8 can be annular, and can include a sealing body 81 and an elastic body 82. The elastic body 82 can be connected to the sealing body 81. Both the sealing body 81 and the elastic body 82 can be annular. The sealing body 81 can have a receiving cavity, and the elastic body 82 can be disposed in the receiving cavity. The elastic body 82 can be compressed and elastically deformed along the radial direction R of the solenoid valve, and the sealing ring 8 is compressed and elastically deformed, so that the inner peripheral surface of the sealing body 81 can be tightly fitted with the push rod 4, and the outer peripheral surface of the sealing body 81 can be tightly fitted with the gasket 7 and / or the valve seat 1.

[0054] The elastic body 82 can be a V-shaped spring, meaning its axial cross-section is V-shaped. Two V-shaped springs can be provided, arranged axially along the solenoid valve. The tips of the two V-shaped springs can face each other, and their open ends can face the axial sides of the solenoid valve. The two V-shaped springs can be mounted on the same sealing body 81. The V-shaped springs can apply localized pressure to the sealing body 81 axially, allowing it to contact the sealed component only at the position corresponding to the end of the V-shaped spring, thus minimizing the contact area between the sealing body 81 and the sealed component. This results in a better sealing effect, maintaining a seal even if the push rod 4 has a certain eccentricity with the gasket 7 and / or valve seat 1. Because the contact area between the sealing body 81 and the sealed component is small, the sliding friction between the push rod 4 and the sealing body 81 during movement is minimal, eliminating the need for additional lubrication on the sealing ring 8. The sealing structure using the sealing ring 8 is simple, making the solenoid valve easy to assemble.

[0055] The sealing ring 8 can be a single piece or multiple separate pieces.

[0056] like Figure 3 As shown, in another embodiment, the sealing ring may include two sealing bodies 81 and two elastic bodies 82, with one elastic body 82 disposed within each sealing body 81. The two sealing bodies 81 may be disposed within two annular grooves, respectively. One annular groove may be formed in the gasket 7, and the other annular groove may be formed in the valve seat 1.

[0057] exist Figures 1 to 3 In the example shown, the elastomer 82 can be made of metal, and the seal 81 can be made of an elastic material, such as rubber or PTFE (Teflon). The elastomer 82 can be housed solely within the receiving cavity of the seal 81. Alternatively, the elastomer 82 can be partially bonded, for example, vulcanized to the seal 81, or partially embedded in the seal 81, which can improve the stability and durability of the connection between the elastomer 82 and the seal 81.

[0058] See Figure 1 , Figure 2The valve seat 1 is provided with a sealing surface 13, which can be located on one axial side of the sealing gasket 5. The sealing surface 13 can be inclined relative to the cross-section of the solenoid valve; for example, the radially inner side of the sealing surface 13 is closer to the sealing gasket 5 than the radially outer side. The radially inner side of the sealing surface 13 can extend to the first flow channel opening 11. The sealing surface 13 and the first flow channel opening 11 can be smoothly transitioned by a chamfer 14. It is understood that the chamfer can include a rounded corner. The chamfer 14 and the sealing gasket 5 are located in the same radial region. When the push rod is in the first position, the chamfer 14 can contact the upper end face 51 of the sealing gasket 5. The chamfer 14 makes it easier for the sealing gasket 5 to be compressed and deformed, thereby improving the sealing performance, reducing the stress on the sealing gasket 5, and making the sealing gasket 5 less prone to failure.

[0059] This application is not limited to the above embodiments. Those skilled in the art can make various modifications to the above embodiments of this application under the guidance of this application, without departing from the scope of this application. In addition, the following description is provided.

[0060] (1) In the above embodiment, the push rod limiting part is located on the liner 7, but this application is not limited to this. In other possible embodiments, the push rod limiting part may also be provided on the valve seat.

[0061] (2) In other possible implementations, the sealing surface of the valve seat may be provided with a concave-convex structure, and the sealing gasket is elastically deformed by the protruding part, thereby achieving sealing.

[0062] (3) In the above embodiments, the tips of the V-shaped springs are arranged opposite each other, but this application is not limited to this. In other possible embodiments, the open ends of the V-shaped springs may be arranged opposite each other.

[0063] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0064] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0065] In this application, unless otherwise expressly stated or limited, terms such as "installation," "assembly," "connection," "linking," "joining," "linking," "abutment," "communication," "connection," "conduction," "fixing," and "fastening" should be interpreted broadly, for example, they can be direct or indirect. For instance, regarding connection, 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 an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly stated or limited. For instance, regarding communication / conduction, it can be direct communication / conduction or indirect communication / conduction through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0066] In this application, unless otherwise expressly stated or limited, a component being disposed / installed / located / enclosed / placed within, inside, or incorporated in another component can be either of the following two situations: a portion or a majority of the one component is located within the other component; or the one component is completely enclosed within the other component.

[0067] Although the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein. The present application can be modified and implemented as alternative embodiments without departing from the spirit and scope of the present application as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning for the present application.

Claims

1. An electromagnetic valve characterized by comprising: The application relates to an electromagnetic valve. The electromagnetic valve comprises: a push rod capable of moving along the axial direction of the electromagnetic valve between a first position and a second position; a sealing gasket arranged at one end of the push rod in the axial direction; a valve seat provided with a first flow passage opening and a second flow passage opening, the first flow passage opening and the second flow passage opening being in communication, the valve seat being provided with a sealing surface arranged at one side of the sealing gasket in the axial direction; and a push rod limiting portion arranged at the other side of the sealing gasket in the axial direction. In the state that the push rod is in the first position, the push rod blocks the communication between the first flow passage opening and the second flow passage opening, and the upper end surface of the sealing gasket is in contact with the sealing surface. In the state that the push rod is in the second position, the lower end surface of the sealing gasket is in contact with the push rod limiting portion.

2. The electromagnetic valve according to claim 1, characterized by One end of the push rod in the axial direction is provided with a radial protrusion protruding from the main body of the push rod in the radial direction of the electromagnetic valve, and the sealing gasket covers at least two end surfaces of the radial protrusion in the axial direction.

3. The electromagnetic valve according to claim 1, characterized by The sealing surface is inclined relative to the cross section of the electromagnetic valve, and the radial inner side of the sealing surface is closer to the sealing gasket than the radial outer side.

4. The electromagnetic valve according to claim 3, characterized by The radial inner side of the sealing surface extends to the first flow passage opening, and the sealing surface and the first flow passage opening are smoothly connected through a chamfer, the chamfer and the sealing gasket are located in the same radial area, and the chamfer is in contact with the sealing gasket in the state that the push rod is in the first position.

5. The electromagnetic valve according to claim 1, characterized by The push rod is provided with a sealing ring, the sealing ring comprises a sealing body and an elastic body, the sealing body is annular, the sealing body has a receiving cavity, the elastic body is arranged in the receiving cavity, and the elastic body is arranged to be elastically deformed in the radial direction of the electromagnetic valve.

6. The electromagnetic valve according to claim 5, characterized by The elastic body is a V-shaped spring, the tip end and the open end of the V-shaped spring are arranged in the axial direction of the electromagnetic valve.

7. The electromagnetic valve according to claim 6, characterized by The V-shaped spring is provided with two V-shaped springs arranged in the axial direction of the electromagnetic valve, and the two V-shaped springs are installed on the same sealing body.

8. The electromagnetic valve according to claim 6, characterized by The tip ends of the two V-shaped springs are oppositely arranged, and the open ends of the two V-shaped springs are directed to the two sides in the axial direction of the electromagnetic valve.

9. The electromagnetic valve according to claim 5, characterized by The elastic body is made of metal, the sealing body is made of elastic material, and the elastic body is partially bonded to the sealing body or partially embedded in the sealing body.

10. The electromagnetic valve according to claim 1, characterized by The electromagnetic valve further comprises a coil and an armature, the coil is sleeved on the armature, the push rod is connected to the armature, and the coil is energized to drive the armature to move the push rod, the axial two ends of the armature are respectively provided with a first compression spring and a second compression spring, and the first compression spring and the second compression spring can exert forces in opposite directions on the armature.

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