Valve seat assembly for a solenoid valve

Abstract

This utility model discloses a valve seat assembly for a solenoid valve, including a valve seat and a sleeve axially connected to the valve seat. The sleeve is a cylindrical shape with both ends open. The inner sidewall of the sleeve is a guide straight cylinder sidewall. A through hole is provided in the middle of the valve seat. A flange is provided at the first end of the sleeve for connecting to the base of the solenoid valve. A mating and fixing sidewall is provided on the outer side of the valve seat. A straight cylinder connecting part is provided at the second end of the sleeve and is fixedly connected to the mating and fixing sidewall. Several flow holes are provided on the sidewall of the sleeve. The sleeve can be firmly connected to the base of the solenoid valve through the flange. At the same time, the mating and fixing of the mating and fixing sidewall and the straight cylinder connecting part ensures sealing and connection firmness.

Description

Technical Field

[0001] This utility model relates to the field of solenoid valve technology, specifically to a valve seat assembly for a solenoid valve. Background Technology

[0002] Closed-loop air supply units (ASUs) are gaining increasing attention from end-users due to their high inflation efficiency. Throughout the entire lifecycle of a closed-loop air supply unit, the ASU plays a crucial role in transporting gas between the air spring and the gas tank, moving gas from the air spring to the gas tank or vice versa. To improve the integration of the ASU, a large number of solenoid valves need to be installed on the integrated valve body to cut off and open different air passages within the integrated valve body. The valve seat assembly on existing solenoid valves generally includes a valve seat and a sleeve. The valve seat serves to fix and seal the valve, while the sleeve connects the valve seat to the solenoid valve base. The sleeve also needs to guide the valve core inside. Therefore, the connection strength and sealing performance between the valve seat and the sleeve are particularly important. Utility Model Content

[0003] This invention provides a valve seat assembly for a solenoid valve, which can solve the problems of unreliable strength and sealing performance and excessively high production cost of the valve seat assembly of the solenoid valve used in existing closed air supply units.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a valve seat assembly for a solenoid valve, comprising a valve seat and a sleeve axially connected to the valve seat. The sleeve is a cylindrical shape with both ends open. The inner sidewall of the sleeve is a guide straight cylinder sidewall. A through hole is provided in the middle of the valve seat. A flange for connecting to the base of the solenoid valve is provided at the first end of the sleeve. A mating and fixing sidewall is provided on the outer side of the valve seat. A straight cylinder connecting part is provided at the second end of the sleeve and is fixedly connected to the mating and fixing sidewall. A plurality of flow holes are provided on the sidewall of the sleeve. The sleeve can be firmly connected to the base of the solenoid valve through the flange. At the same time, the mating and fixing of the mating and fixing sidewall and the straight cylinder connecting part ensures sealing and connection firmness.

[0005] Preferably, the straight cylindrical connecting part and the mating fixed side wall are connected and fixed by a radial interference fit. The radial interference fit process is relatively simple and has low requirements for the materials of the valve seat and the sleeve.

[0006] Preferably, the straight cylindrical connecting part and the mating fixed side wall are connected and fixed by a weld formed by laser welding, and the connection is sealed and firm by setting the weld.

[0007] Preferably, the flow holes are located near the valve seat and are evenly distributed around the circumference to ensure that the gas from the external air passage can enter the sleeve evenly.

[0008] Preferably, the flange and the guide cylinder sidewall are connected by a first rounded corner, which facilitates the forming process of the flange and also improves the strength of the flange.

[0009] Preferably, the bottom of the fixed sidewall is provided with a limiting step, and the lower axial end of the limiting step is provided with a sealing ring mating part. The sealing ring mating part can be installed on the outside to form a seal between the sealing ring and the integrated valve body of the closed air supply unit. The limiting step can limit the axial position of the sleeve.

[0010] Preferably, the upper edge of the fixed sidewall is provided with a second rounded corner, and the lower inner side of the straight cylindrical connecting part is provided with a guide cone surface. The second rounded corner and the guide cone surface cooperate to guide the sleeve during the process of fitting the fixed sidewall, ensuring concentricity.

[0011] Preferably, the top of the valve seat is provided with a sealing boss that mates with the valve core around the through hole, which is beneficial for the valve core to seal the through hole.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] The sleeve can be firmly connected to the base of the solenoid valve through the flange. At the same time, the cooperation between the fixed side wall and the straight cylinder connection ensures the sealing and connection of the sleeve and valve seat. The forming process of the sleeve and valve seat is simple and low cost, and can achieve the substitution of parts with the same function. Attached Figure Description

[0014] Figure 1 This is a partial cross-sectional perspective view of the present invention.

[0015] Figure 2 This is a cross-sectional view of the sleeve structure of this utility model;

[0016] Figure 3 This is a partial cross-sectional perspective view of the valve seat of this utility model.

[0017] Figure label:

[0018] 1. Sleeve; 11. Guide straight cylinder sidewall; 12. Flange; 13. First rounded corner; 14. Flow hole; 16. Straight cylinder connection; 17. Guide cone surface; 2. Valve seat; 21. Through hole; 22. Sealing boss; 23. Fitting and fixing sidewall; 24. Second rounded corner; 25. Limiting step; 26. Sealing ring mating part; 3. Weld. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0020] like Figure 1-3 As shown, this utility model provides a solution to the problems of unreliable strength and sealing performance and high production cost of the valve seat assembly of the solenoid valve used in the existing closed air supply unit. The utility model provides the following technical solution: A valve seat assembly of a solenoid valve includes a valve seat 2 and a sleeve 1 axially connected to the valve seat 2. The sleeve 1 is a cylindrical shape with both ends through. The inner side wall of the sleeve 1 is a guide straight cylindrical side wall 11. The valve seat 2 has a through hole 21 in the middle. The first end of the sleeve 1 is provided with a flange 12 for connecting to the base of the solenoid valve. The outer side of the valve seat 2 is provided with a mating and fixing side wall 23. The second end of the sleeve 1 is provided with a straight cylindrical connecting part 16 fixedly connected to the mating and fixing side wall 23. The side wall of the sleeve 1 is provided with a plurality of flow holes 14. The sleeve 1 can be firmly connected to the base of the solenoid valve through the flange 12. At the same time, the mating and fixing of the mating and fixing side wall 23 and the straight cylindrical connecting part 16 ensures sealing and connection firmness.

[0021] In this embodiment, the straight cylindrical connecting part 16 and the mating fixed side wall 23 are connected and fixed by radial interference fit. The radial interference fit process is relatively simple and has low requirements for the materials of valve seat 2 and sleeve 1. When using radial interference fit, the interference amount is controlled at 0.03-0.06mm (for example, the inner diameter of the sleeve is 0.04mm smaller than the outer diameter of the valve seat). The surface roughness Ra of the mating surface is ≤1.6μm. Through cold pressing assembly process (pressing speed 5mm / s), a tight mechanical engagement can be formed. After air tightness test, the leakage is ≤5ml / min under 1.5MPa air pressure, which meets the requirements of ISO6150 standard.

[0022] In this embodiment, the straight cylindrical connecting part 16 and the mating fixed side wall 23 are connected and fixed by a weld 3 formed by laser welding. The weld 3 achieves a sealed and secure connection. Specifically, pulsed laser welding (power 200-300W, welding speed 10mm / s) is used during laser welding. The weld 3 has a width of 0.2-0.3mm and a depth of 0.5-0.8mm, forming a continuous sealed fusion line. After a burst test, the pressure resistance of the connection part can reach 6MPa, which is 200% higher than traditional adhesive bonding. The mating gap between the straight cylindrical connecting part 16 and the mating fixed side wall 23 is 0.01mm. The laser weld 3 is located at the overlap of the two, continuously distributed in a ring, with a weld width of 0.25mm and a penetration depth of 0.6mm.

[0023] In this embodiment, the flow holes 14 are located near the valve seat 2 and are evenly distributed around the circumference to ensure that the gas from the external gas passage can enter the sleeve 1 uniformly. Specifically, the diameter of the flow holes is set to 2-3 mm (e.g., three φ2.5 mm holes evenly distributed), and the distance from the center of the hole to the end face of the valve seat is 5 mm, reducing the pressure loss of the gas flow by 15% (compared to the traditional upper arrangement structure). CFD fluid simulation shows that the gas flow velocity uniformity index in the sleeve increases from 0.72 to 0.91, avoiding noise caused by local eddies (noise value decreases from 65 dB to 58 dB).

[0024] In this embodiment, the flange portion 12 and the guide cylinder sidewall 11 are connected by a first rounded corner portion 13. The first rounded corner portion 13 facilitates the forming process of the flange portion 12 and also improves the strength of the flange portion 12. Specifically, the transition design of the first rounded corner portion 13 (rounded corner radius R = 1.5 mm) can reduce stress concentration. Finite element analysis has verified that the maximum stress value of the flange portion under 2 MPa air pressure impact is reduced from 120 MPa to 85 MPa, thus avoiding fatigue fracture.

[0025] In this embodiment, a limiting step 25 is provided at the bottom of the fixed side wall 23. A sealing ring mating part 26 is provided at the lower axial end of the limiting step 25. A sealing ring can be installed on the outside of the sealing ring mating part 26 to form a seal between the sealing ring and the integrated valve body of the closed air supply unit. The limiting step 25 can limit the axial position of the sleeve 1.

[0026] Preferably, the upper edge of the fixed sidewall 23 is provided with a second rounded corner portion 24, and the inner side of the lower end of the straight cylindrical connecting portion 16 is provided with a guide cone surface 17. The second rounded corner portion 24 and the guide cone surface 17 cooperate to guide the sleeve 1 during the fitting of the fixed sidewall 23, ensuring concentricity. Specifically, the radius of the second rounded corner portion 24 is R = 0.8 mm, and the taper of the guide cone surface 17 on the inner side of the straight cylindrical connecting portion is 15°, which facilitates assembly guidance.

[0027] In this embodiment, the top of the valve seat 2 is provided with a sealing boss 22 that mates with the valve core around the through hole 21. This facilitates the valve core's sealing of the through hole 21. The sealing boss 22 has a height of 1.2 mm, a top plane diameter of φ8 mm, and a surface roughness Ra≤0.8 μm. When it mates with the sealing surface of the valve core (not shown), the uniformity of the contact pressure distribution is improved by 40%. When the valve core is pressed down to seal the through hole 21, the rigid support of the sealing boss can reduce the deformation of the valve core. Under a gas pressure of 1.5 MPa, the sealing contact stress between the valve core and the boss reaches 1.2 MPa, which meets the zero leakage requirement.

[0028] In the ASU integrated valve body, this valve seat assembly is used to control the gas flow between the air spring and the gas tank. When the ASU is working, the flow hole 14 of the sleeve 1 introduces the gas in the integrated valve body into the sleeve, and then into the valve core control area through the through hole 21. The gas path is switched by opening and closing the valve core. In the ASU whole machine test, after undergoing 500,000 cycles (temperature -40℃~125℃, air pressure 0~1.6MPa), the connection parts showed no cracks, the sealing rings showed no aging, and the flow hole was not blocked, meeting the service life requirement of 10 years / 1 million kilometers for commercial vehicles.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A valve seat assembly for a solenoid valve, characterized by The device includes a valve seat (2) and a sleeve (1) axially connected to the valve seat (2). The sleeve (1) is a cylindrical shape with both ends open. The inner side wall of the sleeve (1) is a guide straight cylinder side wall (11). The valve seat (2) has a through hole (21) in the middle. The first end of the sleeve (1) is provided with a flange (12) for connecting to the base of the solenoid valve. The outer side of the valve seat (2) is provided with a mating and fixing side wall (23). The second end of the sleeve (1) is provided with a straight cylinder connecting part (16) fixedly connected to the mating and fixing side wall (23). The side wall of the sleeve (1) is provided with several flow holes (14).

2. The valve seat assembly of the solenoid valve according to claim 1, characterized in that: The straight cylindrical connecting part (16) and the mating fixed side wall (23) are connected and fixed by radial interference fit.

3. The valve seat assembly of the solenoid valve according to claim 1, characterized in that: The straight cylindrical connecting part (16) and the mating fixed side wall (23) are connected and fixed by a weld (3) formed by laser welding.

4. The valve seat assembly of the solenoid valve according to claim 1, characterized in that: The flow hole (14) is located near the valve seat (2) and is evenly distributed around the circumference.

5. The valve seat assembly of the solenoid valve according to claim 1, characterized in that: The flange (12) and the guide cylinder sidewall (11) are connected by a first rounded corner (13).

6. The valve seat assembly of the solenoid valve according to any one of claims 1-5, characterized in that: The bottom of the fixed sidewall (23) is provided with a limiting step (25), and the lower axial end of the limiting step (25) is provided with a sealing ring mating part (26).

7. The valve seat assembly of the solenoid valve according to claim 6, characterized in that: The upper edge of the fixed sidewall (23) is provided with a second rounded corner (24), and the lower inner side of the straight cylindrical connecting part (16) is provided with a guide cone surface (17).

8. The valve seat assembly of the solenoid valve according to claim 7, characterized in that: The valve seat (2) is provided with a sealing boss (22) around the through hole (21) to cooperate with the valve core.

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