Electromagnetic valve and sealing method thereof

Abstract

The invention provides an electromagnetic valve and a sealing method thereof, the electromagnetic valve comprises static iron and a valve core, a dynamic seal is arranged between the static iron and the valve core, and the dynamic seal is used for sealing the static iron and the valve core. According to the technical scheme, the dynamic seal is arranged between the static iron and the valve element, and the dynamic seal is used for sealing the static iron and the valve element; the dynamic seal can provide dynamic seal for the valve and can guide the valve element, sealing is reliable, friction force is small, the structure is simple, and the service life is long.

Description

Background Art

[0002] Solenoid valves are fast-responding and easy-to-operate on-off valves that are widely used in various industries, and are particularly important in the aerospace field. The solenoid valves currently used in satellite systems have relatively high performance requirements and harsh working environments, which poses a great challenge to valve designers.

[0003] At present, satellites have the following performance requirements for solenoid valves due to their working profile and the characteristics of the environment they are in: fast response, long life (≮1 million times), compact structure, small mass, small electromagnetic force required, etc. Based on the above requirements, the main structural scheme of satellite solenoid valves is axial flow direct-acting type, with the inlet and outlet set on a line, and the valve core is also the armature. At the same time, in order to ensure the life requirement of ≮1 million times, the kinematic pair of the valve core and the housing is designed as a reed structure, and the valve is opened and closed by the deformation of the reed, minimizing the wear of the valve core and the housing.

[0004] However, this solution has many shortcomings, mainly: the reed structure is relatively complex, the production process is difficult, and the reed raw materials are relatively expensive; due to the influence of the reed material and structure, the valve core stroke cannot be increased, thus limiting the flow rate of the valve; at the same time, due to the influence of structure and quality, the electromagnetic force cannot be increased, which also limits the flow capacity of the valve. Summary of the invention

[0005] The present application provides a solenoid valve and a sealing method thereof, so as to increase the service life of the solenoid valve.

[0006] In a first aspect, a solenoid valve is provided, comprising: a stationary iron and a valve core, wherein:

[0007] A dynamic seal is provided between the static iron and the valve core.

[0008] The dynamic seal is used to seal the static iron and the valve core.

[0009] In the above technical solution, a dynamic seal is provided between the stationary iron and the valve core, and the dynamic seal is used to seal the stationary iron and the valve core; the dynamic seal can provide dynamic sealing for the valve and guide the valve core, and has reliable sealing, small friction, simple structure and long service life.

[0010] In a specific embodiment, the dynamic seal includes a sealing frame and a rubber ring, wherein:

[0011] The rubber ring includes a first lip, a second lip, a third lip and a fourth lip.

[0012] The first lip and the second lip are used for bidirectional dynamic sealing of the valve core; bidirectional here refers to two directions from the top and bottom of the valve core.

[0013] The third lip and the fourth lip are used to statically seal the static iron.

[0014] In a specific implementation scheme, the sealing frame set is arranged on the valve core, and the rubber ring is set with the sealing frame set.

[0015] The first lip and the second lip abut against the valve core;

[0016] The third lip and the fourth lip are sealed and connected to the stationary iron.

[0017] In a specific implementation manner, the first lip and the second lip are symmetrically arranged on both sides of the sealing frame.

[0018] In a specific implementation manner, the rubber ring and the sealing frame are integrally injection molded.

[0019] In a specific embodiment, the dynamic seal comprises a plastic ring, wherein:

[0020] The plastic ring includes a fifth lip and a sixth lip,

[0021] The fifth lip and the sixth lip are used to perform bidirectional dynamic sealing on the valve core;

[0022] The plastic ring is interference fit with the static iron and is used for static sealing of the static iron.

[0023] In a specific implementation manner, the fifth lip and the sixth lip abut against the valve core;

[0024] The side of the plastic ring away from the fifth lip or the sixth lip is interference fit with the static iron.

[0025] In a specific implementation scheme, the dynamic seal includes an O-ring and a support member, wherein the O-ring is embedded in the support member, wherein:

[0026] The O-ring is used to perform bidirectional dynamic sealing on the valve core;

[0027] The support member is used for statically sealing the static iron.

[0028] In a specific implementation scheme, the valve core is provided with a through hole along the central axis direction, and the outer diameter of the valve core is equal to the center diameter of the corresponding valve seat.

[0029] In a second aspect, a sealing method for a solenoid valve is provided, comprising the following steps:

[0030] A dynamic seal is set between the static iron and the valve core.

[0031] The dynamic seal is used to seal the static iron and the valve core.

[0032] In the above technical solution, a dynamic seal is provided between the stationary iron and the valve core, and the dynamic seal is used to seal the stationary iron and the valve core; the dynamic seal can provide dynamic sealing for the valve and guide the valve core, and has reliable sealing, small friction, simple structure and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the structure of the solenoid valve provided in the embodiment of the present application;

[0034] Figure 2 A schematic diagram of the structure of the valve core provided in an embodiment of the present application;

[0035] Figure 3 A schematic diagram of the structure of a dynamic seal provided in an embodiment of the present application;

[0036] Figure 4 A schematic diagram of the structure of another dynamic seal provided in an embodiment of the present application;

[0037] Figure 5 A schematic diagram of the structure of another dynamic seal provided in an embodiment of the present application;

[0038] Figure 6 A flowchart of a sealing method for a solenoid valve provided in an embodiment of the present application.

[0039] Among them, 1-static iron, 2-valve core, 3-dynamic seal, 4-sealing frame, 5-rubber ring, 6-first lip, 7-second lip, 8-third lip, 9-fourth lip, 10-plastic ring, 11-fifth lip, 12-sixth lip, 13-O-ring, 14-support, 15-armature, 16-spring, 17-connecting rod, 18-valve body, 19-connector, 20-coil, 21-magnetic shell, 22-through hole. DETAILED DESCRIPTION

[0040] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0041] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0042] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0043] To facilitate understanding of the solenoid valve and its sealing method provided in the embodiment of the present application, its application scenario is first explained. The solenoid valve and its sealing method provided in the embodiment of the present application are used to improve the service life of the solenoid valve. As a fast-response and easy-to-operate switch valve, the solenoid valve is widely used in all walks of life, and is particularly important in the aerospace field. The solenoid valves currently used in satellite systems have relatively high performance requirements and a harsh working environment, which poses a great challenge to valve designers. At present, satellites have the following performance requirements for solenoid valves due to the characteristics of their working profiles and the environment in which they are located: fast response, long life (≮1 million times), compact structure, small mass, small required electromagnetic force, etc. Based on the above requirements, the main structural scheme of the current satellite solenoid valve is axial flow direct-acting, with the inlet and outlet arranged on a line, and the valve core is also the armature. At the same time, in order to ensure the life requirement of ≮1 million times, the kinematic pair of the valve core and the housing is designed as a reed structure, and the valve is opened and closed by the deformation of the reed, minimizing the wear of the valve core and the housing. However, this solution has many shortcomings, mainly: the reed structure is relatively complex, the production process is difficult, and the raw materials of the reed are relatively expensive; the valve core stroke cannot be increased due to the influence of the reed material and structure, thus limiting the flow rate of the valve; and the electromagnetic force cannot be increased due to the influence of the structure and quality, thus limiting the flow capacity of the valve. For this reason, the embodiment of the present application provides a solenoid valve and a sealing method thereof to increase the service life of the solenoid valve. The following is a detailed description of the embodiment in conjunction with the specific drawings.

[0044] refer to Figures 1 to 6 , Figure 1 A schematic diagram of the structure of the solenoid valve provided in the embodiment of the present application; Figure 2 A schematic diagram of the structure of the valve core provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of a dynamic seal provided in an embodiment of the present application; Figure 4 A schematic diagram of the structure of another dynamic seal provided in an embodiment of the present application;

[0045] Figure 5 A schematic diagram of the structure of another dynamic seal provided in an embodiment of the present application; Figure 6 A flowchart of a sealing method for a solenoid valve provided in an embodiment of the present application.

[0046] exist Figure 1 The embodiment of the present application provides a solenoid valve, comprising: a stationary iron 1 and a valve core 2, wherein:

[0047] A dynamic seal 3 is provided between the static iron and the valve core.

[0048] The dynamic seal is used to seal the static iron and the valve core.

[0049] In the above technical solution, a dynamic seal is provided between the stationary iron and the valve core, and the dynamic seal is used to seal the stationary iron and the valve core; the dynamic seal can provide dynamic sealing for the valve and guide the valve core, and has reliable sealing, small friction, simple structure and long service life.

[0050] refer to Figure 2 and Figure 3 In a specific implementation scheme, the dynamic seal includes a sealing frame 4 and a rubber ring 5, wherein:

[0051] The rubber ring includes a first lip 6, a second lip 7, a third lip 8 and a fourth lip 9.

[0052] The first lip and the second lip are used to perform bidirectional dynamic sealing on the valve core;

[0053] The third lip and the fourth lip are used to statically seal the static iron.

[0054] In a specific implementation scheme, the sealing frame set is arranged on the valve core, and the rubber ring is set with the sealing frame set.

[0055] The first lip and the second lip abut against the valve core;

[0056] The third lip and the fourth lip are sealed and connected to the stationary iron.

[0057] In a specific implementation manner, the first lip and the second lip are symmetrically arranged on both sides of the sealing frame.

[0058] In a specific implementation manner, the rubber ring and the sealing frame are integrally injection molded.

[0059] refer to Figure 4 In a specific embodiment, the dynamic seal includes a plastic ring 10, wherein:

[0060] The plastic ring includes a fifth lip 11 and a sixth lip 12.

[0061] The fifth lip and the sixth lip are used to perform bidirectional dynamic sealing on the valve core;

[0062] The plastic ring is interference fit with the static iron and is used for static sealing of the static iron.

[0063] In a specific implementation manner, the fifth lip and the sixth lip abut against the valve core;

[0064] The side of the plastic ring away from the fifth lip or the sixth lip is interference fit with the static iron.

[0065] Specifically, refer to Figure 4 The dynamic seal is made of plastic. The fifth lip 11 and the sixth lip 12 are provided on the structure to cooperate with the valve core to realize the bidirectional dynamic sealing function. The outer diameter of this structure realizes static sealing with the static iron through interference fit. The dynamic seal of this structure is easy to install, the structure is further simplified, and the cost is further reduced.

[0066] refer to Figure 5 In a specific implementation scheme, the dynamic seal includes an O-ring 13 and a support member 14, wherein the O-ring is embedded in the support member, wherein:

[0067] The O-ring is used to perform bidirectional dynamic sealing on the valve core;

[0068] The support member is used for statically sealing the static iron.

[0069] Specifically, refer to Figure 5 The dynamic seal includes an O-ring and a support; the O-ring is made of rubber and the support is made of plastic. The O-ring is responsible for the dynamic seal with the valve core, and the support is responsible for the static seal with the static iron through interference fit. In specific implementation, for the solenoid valve adopting this structure, two dynamic sealing structures can be arranged along the movement direction of the valve core to achieve the guide balance of the valve core.

[0070] The advantage of this solution is that it solves the problem of low life of a single O-ring, while avoiding the disadvantage of high friction of the all-plastic sealing structure.

[0071] In a specific implementation scheme, the valve core is provided with a through hole 22 along the central axis direction, and the outer diameter of the valve core is equal to the center diameter of the corresponding valve seat.

[0072] Specifically, the solenoid valve includes: an armature 15, a spring 16, a connecting rod 17, a static iron 1, a dynamic seal 3, a valve body 18, a valve core 2, a connector 19, a coil 20 and a magnetic conductive housing 21. The two ends of the connecting rod are respectively connected to the armature and the valve core, which can be threaded or interference connected, and the static iron is sleeved in the middle, and a spring is installed between the armature and the static iron; the coil is installed outside the armature and the static iron; the coil is installed outside the magnetic conductive housing, and the connector is welded on the magnetic conductive housing; the valve body fixes the dynamic seal to the static iron, and the dynamic seal is sleeved on the valve core.

[0073] In this embodiment, the solenoid valve is a normally open solenoid valve, and the inlet and outlet are connected when the power is off; after power is turned on, the armature drives the connecting rod and the valve core to move downward under the action of the electromagnetic force until the valve core fits the valve seat, the valve is closed, and the dynamic seal blocks the inlet and outlet media, thereby disconnecting the flow channel.

[0074] refer to Figure 2 The valve core is provided with a through hole, through which the media on the upper and lower ends of the valve core can be connected. The outer diameter φA of the valve core is equal to the middle diameter φB of the valve seat, so it can be ensured that after the valve is closed, the force-bearing areas on the upper and lower sides of the valve core are equal, that is, the axial force on the valve core is zero.

[0075] refer to Figure 3 The dynamic seal includes a rubber ring and a sealing frame. The rubber ring is integrally injection-molded on the sealing frame, wherein the sealing frame is T-shaped; the rubber ring is provided with a first lip, a second lip, a third lip and a fourth lip. The rubber ring realizes a bidirectional dynamic seal with the valve core through the first lip and the second lip, and realizes a static seal with the static iron through the third lip and the fourth lip. A layer of PTFE coating is sprayed on the matching surface of the valve core to increase the surface finish and wear resistance. In this embodiment, the dynamic seal not only plays a sealing role, but also serves to provide a guide for the valve core.

[0076] Furthermore, the dynamic seal structure adopts an interference connection between the seal frame and the stationary iron, and the valve body and the stationary iron are connected by threads. Another connection method is that the seal frame and the stationary iron are connected by gaps, and the dynamic seal is fixed to the stationary iron by extrusion through the valve body, and the valve body and the stationary iron are connected by threads.

[0077] In the above technical scheme, the dynamic seal can provide both dynamic sealing for the valve and guidance for the valve core, with reliable sealing, low friction, simple structure and long service life; a through hole is set on the valve core to allow the medium to communicate, and the upper and lower end surface areas are equal, so that the valve core itself is not affected by the medium force, and the required electromagnetic force is also reduced, allowing the valve core to move a larger stroke; the dynamic seal can effectively solve the problems of complex structure, high cost, complex process and limited flow capacity of the original sealing method, and at the same time can increase the service life of the valve; the valve core structure of the present application can eliminate the influence of the medium force on the valve core, reduce the electromagnetic force required for the valve, and is conducive to simplifying the structure of the solenoid valve and reducing the mass of the solenoid valve.

[0078] exist Figure 6 , the embodiment of the present application provides a sealing method for a solenoid valve, comprising the following steps:

[0079] A dynamic seal is set between the static iron and the valve core.

[0080] The dynamic seal is used to seal the static iron and the valve core.

[0081] In the above technical solution, a dynamic seal is provided between the stationary iron and the valve core, and the dynamic seal is used to seal the stationary iron and the valve core; the dynamic seal can provide dynamic sealing for the valve and guide the valve core, and has reliable sealing, small friction, simple structure and long service life.

[0082] Those skilled in the art will appreciate that the present application may be implemented as a system, method or computer program product.

[0083] Therefore, the present disclosure may be specifically implemented in the following forms, namely: it may be completely hardware, it may be completely software (including firmware, resident software, microcode, etc.), or it may be a combination of hardware and software, generally referred to herein as a "circuit", "module" or "system". In addition, in some embodiments, the present application may also be implemented in the form of a computer program product in one or more computer-readable media, and the computer-readable medium may contain computer-readable program code.

[0084] Any combination of one or more computer-readable media can be used. Computer-readable media can be computer-readable signal media or computer-readable storage media. Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this document, computer-readable storage media can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0085] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art can change, modify, replace and modify the above embodiments within the scope of the present application. On this basis, a variety of replacements and improvements can be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A solenoid valve, characterized in that: include: Static iron and valve core, among which, A dynamic seal is provided between the static iron and the valve core. The dynamic seal is used to seal the static iron and the valve core.

2. The solenoid valve according to claim 1, characterized in that: The dynamic seal includes a sealing frame and a rubber ring, wherein: The rubber ring includes a first lip, a second lip, a third lip and a fourth lip. The first lip and the second lip are used to perform bidirectional dynamic sealing on the valve core; The third lip and the fourth lip are used to statically seal the static iron.

3. The solenoid valve according to claim 2, characterized in that: The sealing frame is set on the valve core, and the rubber ring is set with the sealing frame. The first lip and the second lip abut against the valve core; The third lip and the fourth lip are sealed and connected to the stationary iron.

4. The solenoid valve according to claim 3, characterized in that: The first lip and the second lip are symmetrically arranged on both sides of the sealing frame.

5. The solenoid valve according to claim 4, characterized in that: The rubber ring and the sealing frame are integrally injection-molded.

6. The solenoid valve according to claim 1, characterized in that: The dynamic seal comprises a plastic ring, wherein: The plastic ring includes a fifth lip and a sixth lip, The fifth lip and the sixth lip are used to perform bidirectional dynamic sealing on the valve core; The plastic ring is interference fit with the static iron and is used for static sealing of the static iron.

7. The solenoid valve according to claim 6, characterized in that: The fifth lip and the sixth lip are in contact with the valve core; The side of the plastic ring away from the fifth lip or the sixth lip is interference fit with the static iron.

8. The solenoid valve according to claim 1, characterized in that: The dynamic seal comprises an O-ring and a support member, wherein the O-ring is embedded in the support member, wherein: The O-ring is used to perform bidirectional dynamic sealing on the valve core; The support member is used for statically sealing the static iron.

9. The solenoid valve according to any one of claims 1 to 8, characterized in that: The valve core is provided with a through hole along the central axis direction, and the outer diameter of the valve core is equal to the central diameter of the corresponding valve seat.

10. A sealing method for a solenoid valve, characterized in that: The following steps are involved: A dynamic seal is set between the static iron and the valve core. The dynamic seal is used to seal the static iron and the valve core.

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