Electromagnetic valve and sealing structure thereof

Abstract

A sealing structure of an electromagnetic valve comprises a valve, an outer diameter sealing section and a sealing ring, wherein the outer diameter sealing section is of a conical structure with a wide upper part and a narrow lower part; the lip seal framework is arranged on the valve in a sleeving manner; and the lip seal wraps the lip seal framework, and the lip seal is tightly attached to the outer diameter sealing section of the valve. When the valve moves downwards in the axial direction, the sealing interference magnitude between the conical outer diameter sealing section and the lip seal sealing section is gradually increased, continuous tightening type sealing is achieved, the sealing effect is gradually enhanced along with movement of the valve, and the sealing reliability is improved. The outer diameter sealing section of the valve is designed to be of a conical structure with the wide upper portion and the narrow lower portion, after the outer diameter sealing section is tightly attached to the lip seal, the sealing interference magnitude is gradually increased when the valve moves downwards in the axial direction, continuous tightening type sealing is achieved, the sealing effect is gradually enhanced along with movement of the valve, and the problems that a traditional straight cylinder type valve is fixed in sealing interference magnitude and prone to leakage are structurally solved. The valve is matched with the lip seal and the lip seal framework, the functions of axial limiting and noise reduction are achieved, a sound insulation pad can be directly saved, and the number of parts is reduced.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve technology, and more specifically to a solenoid valve and its sealing structure. Background Technology

[0002] Air suspension systems are undergoing a major transformation from traditional single-chamber to multi-chamber technology. Dual-chamber and triple-chamber air springs are core pathways for technological upgrades. They dynamically switch stiffness by changing the effective working volume of the air spring through a stiffness control valve to control the airflow, thereby balancing vehicle comfort and handling. This is a crucial component of hybrid and electric vehicle chassis technology. The air spring stiffness adjustment solenoid valve, as a core component of the stiffness control valve, directly determines the accuracy of stiffness adjustment and product lifespan through the reliability and wear resistance of its sealing structure. Therefore, the sealing structure design of the valve and lip seal in the solenoid valve is a key technical point.

[0003] In existing air spring stiffness regulating solenoid valves, the valve and lip seal often employ a straight-cylinder sliding seal fit. The lip seal rubber component directly wraps around the metal valve skeleton or is built into the valve assembly. After the lip seal is fixed to the stationary iron core, the valve is pushed by the valve stem to perform reciprocating axial movement within the lip seal. This type of straight-cylinder sealing fit structure has two drawbacks. First, because the valve's outer diameter is designed to be constant, dynamic adjustment of the sealing interference cannot be achieved. The sealing effect is limited, and sealing gaps are easily formed due to assembly and wear, leading to air leakage and affecting the stiffness adjustment effect. Second, the lip seal rubber component is under constant compression, and the reciprocating friction with the constant-diameter valve can easily cause permanent deformation and fatigue failure of the rubber, significantly reducing the service life of the sealing structure.

[0004] Meanwhile, the rigid valve sealing structures disclosed in existing technologies, such as patent applications CN202322326956.8, CN202410944577.1 and CN223294131 U, do not optimize the design of the valve sealing section, do not use a conical sealing structure in conjunction with a lip seal to enhance the sealing effect, and the axial limiting and noise reduction of such designs all rely on separate sound insulation pads. The number of parts is large, the structure is complex, and the assembly cost is also increased accordingly.

[0005] To address the core issues of existing solenoid valve sealing structures, such as the inability to dynamically adjust the sealing interference, poor sealing reliability, rapid wear, and short lifespan due to the straight-cylinder fit between the valve and the lip seal, there is an urgent need to design an air spring stiffness regulating solenoid valve sealing structure that uses a conical valve as the core and a lip seal to achieve adjustable sealing effect, reliable sealing, and low wear. Summary of the Invention

[0006] The purpose of this invention is to solve the problems in air spring stiffness regulating solenoid valves, such as the inability to adjust the sealing interference and insufficient sealing reliability due to the valve and lip seal straight cylinder fit, rapid wear of rubber parts, short product life, and the need to rely on separate sound insulation pads for axial limiting and noise reduction, resulting in a large number of parts. Therefore, this invention proposes a solenoid valve and its sealing structure.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A sealing structure for a solenoid valve includes: The valve has a tapered structure with a wider top and a narrower bottom for its outer diameter sealing section. A lip seal frame is fitted onto the valve. The lip seal is coated onto the lip seal skeleton through a vulcanization process, and the lip seal fits tightly against the outer diameter sealing section of the valve.

[0009] As a further aspect of the present invention: the inner wall of the lip seal has a first sealing section in the shape of an annulus protruding at both the upper and lower ends, and the inner wall of the lip seal has a second sealing section in the shape of an annulus protruding between the two first sealing sections. The two first sealing sections and the second sealing section are all in contact with the outer diameter of the valve to form a three-section sealing structure. This structure, together with the valve's conical sealing section, achieves multiple sealing protection, further eliminating air leakage from the structure and ensuring the working accuracy of the stiffness regulating solenoid valve.

[0010] As a further aspect of the present invention: the outer radial direction of the lip seal protrudes outward to form a sealing surface. This sealing surface is used to tightly fit against the stationary iron core of the solenoid valve, achieving a seal between the lip seal and the stationary iron core.

[0011] As a further aspect of the present invention: multiple protrusions are formed at intervals on both the upper and lower end faces of the lip seal, and ventilation grooves are formed between the multiple protrusions. The ventilation grooves are adapted to the gas flow requirements of the air suspension system, ensuring the response efficiency of air passage opening and closing.

[0012] As a further aspect of the present invention, the cross-section of the lip seal skeleton is T-shaped.

[0013] As a further aspect of the present invention: the inner wall of the lip seal skeleton is provided with a groove in an annular shape.

[0014] As a further aspect of the present invention: a retaining ring protrudes from the area where the lip seal and the lip seal skeleton fit together, corresponding to and engaging with the groove. The engagement of the retaining ring and the groove enhances the strength of the rubber after vulcanization.

[0015] As a further aspect of the present invention: the valve, in conjunction with the lip seal, forms a hook-type positioning structure, with the upper and lower end faces of the lip seal being higher than the sealing lip surface, and the outer circle of the valve having a stepped structure. This structure meets the requirements for gas flow rate, noise reduction, and stable and reliable limiting, and replaces a separate sound insulation pad to achieve axial limiting and noise reduction.

[0016] As a further aspect of the present invention: the small-diameter section of the conical outer diameter sealing section of the valve transitions smoothly to the large-diameter section, avoiding excessive friction on the sealing section of the lip seal during axial movement of the valve and reducing wear and tear on the rubber parts.

[0017] The transition from the small-diameter section to the large-diameter section of the valve's conical sealing section is smooth, which greatly reduces the friction and scraping between the valve and the lip seal section during axial movement. This avoids permanent deformation and fatigue failure of the lip seal rubber parts due to long-term reciprocating friction. At the same time, the elastic deformation of the rubber lip seal can adapt to the conical valve, further reducing wear and effectively improving the service life of the solenoid valve's sealing structure.

[0018] As a further aspect of the present invention: when the valve moves downward axially, the sealing interference between its conical outer diameter sealing section and lip sealing section gradually increases, thereby achieving continuous tightening sealing. The sealing effect gradually strengthens with the movement of the valve, improving sealing reliability.

[0019] The valve's outer diameter sealing section is designed as a tapered structure that is wider at the top and narrower at the bottom. After it fits tightly with the lip seal, the sealing interference gradually increases as the valve moves downward axially, achieving a continuous tightening seal. The sealing effect gradually strengthens with the movement of the valve. Structurally, this solves the problem of fixed sealing interference and easy leakage in traditional straight-tube valves, and is suitable for the high-precision air circuit sealing requirements of air suspension systems.

[0020] As a further aspect of the present invention: the lip seal is made of rubber material, which has good elasticity and sealing performance, is suitable for fitting and sealing with metal valves, and can achieve adaptive adjustment of the sealing interference through elastic deformation.

[0021] The vent groove on the lip seal ensures a good seal while meeting the gas flow requirements of the air suspension system, thus guaranteeing the response efficiency of the air circuit opening and closing.

[0022] As a further aspect of the present invention: the lip seal skeleton is made of a rigid material, specifically plastic or metal, to ensure the rigidity and support of the structure, prevent the lip seal from shifting during valve movement, and improve the overall stability of the structure.

[0023] An electromagnetic valve includes a sealing structure and a stationary iron core. The valve is mounted inside the stationary iron core via a lip seal skeleton and a lip seal, and the sealing surface on the lip seal is in close contact with the stationary iron core.

[0024] The valve, along with its lip seal and lip seal skeleton, combines axial limiting and noise reduction functions, directly saving a sound insulation pad and reducing the number of parts. At the same time, the lip seal and lip seal skeleton are mounted on and fixed on the stationary iron core, and the T-shaped skeleton ensures support rigidity. The overall structure integrates sealing, limiting, and noise reduction functions, simplifying the assembly process of the solenoid valve and reducing production and assembly costs. Attached Figure Description

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a structural diagram of the valve; Figure 3 It is a cross-sectional structural diagram of the skeleton and lip seal; Figure 4 This is a cross-sectional view of the lip seal; Figure 5 This is a cross-sectional view of the lip seal skeleton; Figure 6 yes Figure 4 Cross-sectional view; Figure 7 yes Figure 6 Enlarged view of point A in the middle; Figure 8 This is a schematic diagram of a valve installed inside a stationary iron core.

[0027] In the diagram: 1. Valve; 11. First diameter section; 12. Second diameter section; 2. Lip seal skeleton; 21. Groove; 3. Lip seal; 31. Sealing surface; 32. Snap ring; 33. Protrusion; 34. First sealing section; 35. Second sealing section; 36. Vent groove; 4. Stationary iron core. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1, combined with Figures 1-7 The device includes a valve 1, a lip seal skeleton 2, and a lip seal 3. The outer diameter sealing section of the valve 1 is designed as a tapered structure that is wider at the top and narrower at the bottom. The first diameter section 11 of the tapered structure is the small diameter end, and the second diameter section 12 is the large diameter end. The transition from the first diameter section 11 to the second diameter section 12 is smooth. The lip seal skeleton 2 is made of metal and has a T-shaped cross section. It is fitted on the outside of the tapered sealing section of the valve 1. The inner wall of the lip seal skeleton 2 has a groove 21 circumferentially formed.

[0030] The lip seal 3 is made of rubber; the retaining ring 32 engages with the groove 21 of the lip seal skeleton 2 to achieve a fixed connection between the lip seal 3 and the lip seal skeleton 2 and avoid relative displacement.

[0031] The outer radial direction of the lip seal 3 protrudes outward to form a sealing surface 31. Multiple protrusions 33 are spaced out on one end face of the lip seal 3, and a ventilation groove 36 is formed between adjacent protrusions 33. The valve 1 cooperates with the lip seal 3 to form a hook-type positioning structure. The upper and lower end faces of the lip seal 3 are higher than the first sealing section 34. The outer circle of the valve 1 is provided with a stepped structure. This structure meets the gas flow requirements of the air suspension system, and at the same time achieves axial limiting and noise reduction, replacing the separate sound insulation pad.

[0032] Example 2, combined with Figure 8 The system includes a stationary iron core 4. In Example 1, the valve 1 is inserted inside the stationary iron core 4. The sealing surface 31 of the lip seal 3 is tightly fitted with the inner wall of the stationary iron core 4 to achieve a seal between the lip seal 3 and the stationary iron core 4. The overall structure integrates sealing, axial limiting, and noise reduction functions, simplifying the internal structure of the solenoid valve.

[0033] The working principle of this invention is as follows: When the solenoid valve is working, the valve stem pushes the valve 1 to move axially within the stationary iron core 4. Since the valve 1 has a conical structure, the sealing interference gradually increases as it moves downwards, achieving a continuous tightening seal and progressively improving the sealing effect. Furthermore, the smooth transition of the conical section reduces friction on the rubber parts of the lip seal 3, preventing fatigue failure. The double sealing sections of the lip seal 3, symmetrically arranged with double lips, form multiple seals, improving the reliability of the air circuit seal. The vent groove 36 ensures efficient gas flow, meeting the air circuit opening and closing requirements of the air suspension system. Simultaneously, the hook-type positioning structure of the valve 1 achieves axial limiting through the end face of the lip seal 3 and the outer circular step of the valve 1, preventing excessive movement of the valve 1. This structure effectively reduces the noise generated by valve movement, replacing a separate sound insulation pad, reducing the number of parts, and improving assembly efficiency.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A sealing structure for a solenoid valve, characterized in that, include: The valve (1) has an outer diameter sealing section that is tapered, wider at the top and narrower at the bottom; A lip seal frame (2) is fitted onto the valve (1); The lip seal (3) covers the lip seal skeleton (2) and the lip seal (3) is tightly fitted to the outer diameter sealing section of the valve (1).

2. The sealing structure according to claim 1, characterized in that, The inner wall of the lip seal (3) has a first sealing section (34) in the shape of a ring protruding at both the upper and lower ends. The inner wall of the lip seal (3) has a second sealing section (35) in the shape of a ring protruding between the two first sealing sections (34). Both the first sealing section (34) and the second sealing section (35) are in contact with the outer diameter of the valve (1).

3. The sealing structure according to claim 1, characterized in that, The outer radial protrusion of the lip seal (3) forms a sealing surface (31).

4. The sealing structure according to claim 1, characterized in that, The lip seal (3) has multiple protrusions (33) at intervals on both the upper and lower end faces, and ventilation grooves (36) are formed between the multiple protrusions (33).

5. The sealing structure according to claim 1, characterized in that, The cross-section of the lip seal skeleton (2) is T-shaped.

6. The sealing structure according to claim 5, characterized in that, The inner wall of the lip seal skeleton (2) is provided with a groove (21) in an annular shape.

7. The sealing structure according to claim 6, characterized in that, The lip seal (3) and the lip seal skeleton (2) have a protruding retaining ring (32) that corresponds to and cooperates with the groove (21).

8. A solenoid valve, characterized in that, The sealing structure includes any one of claims 1 to 7, and also includes a stationary iron core (4). The valve (1) is mounted inside the stationary iron core (4) through the lip seal skeleton (2) and the lip seal (3). The sealing surface (31) on the lip seal (3) is in close contact with the stationary iron core (4).

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