Valve seat seal structure

Abstract

A valve seat sealing structure relates to valve sealing technical field, including sealing ring (2) and the support ring (1) that is embedded in the middle part of its inside, one end surface of sealing ring (2) is the outwardly open tapered sealing surface, and the tapered sealing surface of sealing ring (2) is equipped with self-lubricating wear-resistant film (3). The utility model discloses a sealing ring is designed as the outwardly open tapered sealing surface, increases the contact area with the ball valve core, cooperates self-lubricating wear-resistant film on the tapered sealing surface, not only can be more closely combined with the ball valve core, strengthens sealing performance, solves the problem that rigid sealing contact area is small, still can reduce friction, reduce wear and tear by self-lubricating wear-resistant film;At the same time, the support ring embedded in the middle part of the inside provides stable support for the sealing ring, prevents its excessive deformation and creep under high pressure, effectively overcomes the defects of elastic sealing, finally realizes the dual effect of sealing performance improvement and valve service life extension.

Description

Technical Field

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

[0002] The control of fluid media by valves is mainly achieved through the sealing fit between the valve seat and the ball. The sealing methods of valve seats mainly include rigid sealing and elastic sealing.

[0003] In existing technologies, rigid seals typically achieve sealing by forming a line contact between the valve seat and the ball valve core. However, due to the small contact area, the sealing effect is often poor. Elastic seals, on the other hand, use an elastic sealing ring on the valve seat to form a surface contact with the ball valve core, increasing the sealing area and ensuring a good fit, thus improving the sealing effect. However, because the elastic sealing ring is made of a soft material, it is prone to wear due to friction during long-term use and creep under continuous load, which can lead to leakage problems after prolonged use and affect the service life of the valve. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model provides a valve seat sealing structure.

[0005] The technical solution of this utility model is as follows:

[0006] A valve seat sealing structure includes a sealing ring and a support ring embedded in the middle of its inner side. One end face of the sealing ring is a conical sealing surface with the opening facing outward, and a self-lubricating wear-resistant film is provided on the conical sealing surface of the sealing ring.

[0007] Furthermore, a sealing convex ring is provided in the middle of the conical sealing surface of the sealing ring, and a self-lubricating wear-resistant film forms a pressure-bearing ring band on the surface of the sealing convex ring.

[0008] As one implementation method, an annular groove is provided in the middle of the inner side of the sealing ring, and the support ring is engaged with the annular groove. The cross-section of the annular groove is a radially open U-shape. The axial end face of the support ring is provided with several circumferentially spaced grooves, and the groove wall of the annular groove is provided with protrusions that engage with the grooves.

[0009] Furthermore, the groove is an arc-shaped groove with a radial cross-section of U, and the center of the arc coincides with the axis of the sealing ring.

[0010] Preferably, the sealing ring is made of EPDM rubber, the support ring is made of nylon, and the self-lubricating wear-resistant membrane is made of PTFE.

[0011] Furthermore, to maintain the long-term stable operation of the sealing structure, the radial protrusion height of the sealing ring is 0.15-0.25 times the axial thickness of the sealing ring, the radial depth of the groove is 0.3-0.5 times the radial thickness of the support ring, and the axial thickness of the sealing ring is 1.2-2.5 times the axial thickness of the support ring.

[0012] This invention increases the contact area with the ball valve core by designing the sealing ring as an outward-facing conical sealing surface. Combined with the self-lubricating wear-resistant film on the conical sealing surface, it not only fits more tightly with the ball valve core, enhancing sealing performance and solving the problem of small contact area in rigid seals, but also reduces friction and wear thanks to the self-lubricating wear-resistant film. At the same time, the support ring embedded in the inner center provides stable support for the sealing ring, preventing it from excessively deforming and creeping under high pressure, effectively overcoming the defects of elastic seals, and ultimately achieving the dual effect of improved sealing performance and extended valve service life. Attached Figure Description

[0013] In the attached diagram:

[0014] Figure 1 This is a schematic diagram of a valve seat sealing structure according to this embodiment;

[0015] Figure 2 for Figure 1 A schematic diagram of a half-section structure;

[0016] Figure 3 for Figure 2 Enlarged view of point A;

[0017] Figure 4 This is a schematic diagram of the support ring structure;

[0018] Figure 5 This is a schematic diagram of the sealing ring structure;

[0019] Figure 6 This is a schematic diagram of the structure of a self-lubricating wear-resistant film;

[0020] The components represented by the various reference numerals in the diagram are:

[0021] 1. Support ring; 11. Groove; 2. Sealing ring; 21. Sealing convex ring; 22. Annular groove; 23. Protrusion; 3. Self-lubricating wear-resistant film; 31. Pressure bearing ring belt. Detailed Implementation

[0022] Combination Figure 1 and Figure 2This embodiment provides a valve seat sealing structure, which can be used for sealing between the valve seat and the ball valve core on an automotive water pump or electronic water valve. The valve seat sealing structure includes a sealing ring 2 and a support ring 1 embedded in the middle of its inner side. One end face of the sealing ring 2 is a conical sealing surface with the opening facing outward, and a self-lubricating wear-resistant film 3 is provided on the conical sealing surface of the sealing ring 2.

[0023] This valve seat sealing structure increases the contact area with the ball valve core by designing the sealing ring 2 as an outward-facing conical sealing surface. Combined with the self-lubricating wear-resistant film 3 on the conical sealing surface, it can not only fit more tightly with the ball valve core and enhance the sealing performance, solving the problem of small contact area of ​​rigid seals, but also reduce friction and wear thanks to the self-lubricating wear-resistant film 3. At the same time, the support ring 1 embedded in the inner center provides stable support for the sealing ring 2, preventing it from being excessively deformed and creeped under high pressure, effectively overcoming the defects of elastic seals, and ultimately achieving the dual effect of improved sealing performance and extended valve service life.

[0024] Specific combination Figure 3 and Figure 6 Specifically, the sealing ring 2 has a sealing protrusion 21 in the middle of its conical sealing surface, and a self-lubricating wear-resistant film 3 forms a pressure-bearing ring 31 on the surface of the sealing protrusion 21. The design of the sealing protrusion 21 can concentrate the contact pressure between the ball valve core and the sealing ring 2 when the valve is closed, further enhancing the sealing effect; the pressure-bearing ring 31, thanks to the characteristics of the self-lubricating wear-resistant film 3, can withstand the extrusion pressure of the ball valve core and reduce friction and wear through its self-lubricating properties.

[0025] Combination Figure 5 and Figure 6 It is said that the self-lubricating wear-resistant film 3 can completely cover the conical sealing surface of the sealing ring 2 by hot pressing or bonding, so as to avoid direct friction between the sealing ring 2 and the sealing ring 2.

[0026] Combination Figure 4 and Figure 5 An annular groove 22 is provided in the center of the inner side of the sealing ring 2. The support ring 1 engages with the annular groove 22. The annular groove 22 has a radially open U-shaped cross-section. The axial end face of the support ring 1 has several circumferentially spaced grooves 11. The groove wall of the annular groove 22 has protrusions 23 that engage with the grooves 11. This engagement method makes the connection between the support ring 1 and the sealing ring 2 more stable, effectively preventing the support ring 1 from shifting or rotating inside the sealing ring 2. At the same time, the interlocking of the grooves 11 and the protrusions 23 further enhances the connection strength between the two, ensuring that the support ring 1 can stably support the sealing ring 2 during valve operation.

[0027] Combination Figure 4The groove 11 is an arc-shaped groove with a radial cross-section of U, and the center of the arc coincides with the axis of the sealing ring 2. This special arc-shaped groove design not only facilitates the assembly of the support ring 1 and the annular groove 22, but also ensures the connection strength while enabling the support ring 1 to transmit pressure to the sealing ring 2 more evenly when under force, avoiding local stress concentration that could damage the sealing ring 2.

[0028] The sealing ring 2 can be made of EPDM rubber, which has excellent weather resistance, ozone resistance, chemical corrosion resistance and good elasticity. It can maintain stable performance in a temperature range of -40℃ to 150℃, and adapt to the working requirements of valves in different harsh environments.

[0029] The support ring 1 can be made of nylon. Nylon has high strength, high rigidity, wear resistance and good dimensional stability, which can provide reliable support for the sealing ring 2 and effectively prevent the sealing ring 2 from being excessively deformed and creeped when subjected to high pressure fluid medium.

[0030] The self-lubricating wear-resistant membrane 3 can be made of PTFE material, which has an extremely low coefficient of friction, excellent wear resistance and outstanding chemical stability. During the valve opening and closing process, it can greatly reduce the friction between the sealing ring 2 and the ball valve core, reduce wear, and resist the erosion of various corrosive fluid media, ensuring the long-term stable operation of the sealing structure.

[0031] Combination Figure 3 and Figure 6 To maintain the long-term stable operation of the sealing structure:

[0032] The radial protrusion height of the sealing ring 21 is 0.15-0.25 times the axial thickness of the sealing ring 2. This height ratio enables the sealing ring 21 to generate appropriate contact pressure when it contacts the ball valve core, thereby achieving efficient sealing.

[0033] The radial depth of the groove 11 is 0.3-0.5 times the radial thickness of the support ring 1. The reasonable depth setting of the groove 11 ensures that the support ring 1 and the annular groove 22 are firmly engaged, without excessively weakening the strength of the support ring 1.

[0034] The axial thickness of the sealing ring 2 is 1.2-2.5 times that of the support ring 1. This ensures that the sealing ring 2 has sufficient elastic deformation space to achieve a good sealing effect, while also ensuring that the support ring 1 provides sufficient support force to maintain the structural stability of the sealing ring 2.

[0035] Wherein, the radial protrusion height of the sealing ring 21 is the vertical height of the sealing ring 21 protruding from the conical sealing surface (see...). Figure 3The dimension at h); the axial thickness of the sealing ring 2 is the total thickness of the sealing ring 2 in the axial direction, including the conical sealing surface area; the radial depth of the groove 11 is the maximum depth of the groove 11 on the support ring 1 from the inner diameter surface of the support ring 1 to the bottom of the groove (measured radially along the support ring 1); the radial thickness of the support ring 1 is the wall thickness of the support ring 1 in the mating area of ​​the annular groove 22 (the single-sided thickness dimension of the support ring 1 in the radial direction); the axial thickness of the support ring 1 is the total thickness of the support ring 1 in the axial direction.

Claims

1. A valve seat sealing structure, characterized in that, It includes a sealing ring (2) and a support ring (1) embedded in the middle of its inner side. One end face of the sealing ring (2) is a conical sealing surface with the opening facing outward, and a self-lubricating wear-resistant film (3) is provided on the conical sealing surface of the sealing ring (2).

2. The valve seat sealing structure as described in claim 1, characterized in that, The sealing ring (2) has a sealing convex ring (21) in the middle of the conical sealing surface, and the self-lubricating wear-resistant film (3) forms a pressure-bearing ring (31) on the surface of the sealing convex ring (21).

3. The valve seat sealing structure as described in claim 1, characterized in that, The sealing ring (2) has an annular groove (22) in the middle of its inner side, and the support ring (1) is engaged with the annular groove (22). The cross-section of the annular groove (22) is a radially open U-shape. The axial end face of the support ring (1) is provided with a number of circumferentially spaced grooves (11). The groove wall of the annular groove (22) is provided with protrusions (23) that engage with the grooves (11).

4. The valve seat sealing structure as described in claim 3, characterized in that, The groove (11) is an arc-shaped groove with a radial cross section of U, and its arc center coincides with the axis of the sealing ring (2).

5. The valve seat sealing structure as described in claim 1, characterized in that, The sealing ring (2) is made of EPDM rubber.

6. The valve seat sealing structure as described in claim 1, characterized in that, The support ring (1) is made of nylon.

7. The valve seat sealing structure as described in claim 1, characterized in that, The self-lubricating wear-resistant film (3) is made of PTFE.

8. The valve seat sealing structure as described in claim 2, characterized in that, The radial protrusion height of the sealing ring (21) is 0.15-0.25 times the axial thickness of the sealing ring (2).

9. A valve seat sealing structure as described in claim 3, characterized in that, The radial depth of the groove (11) is 0.3-0.5 times the radial thickness of the support ring (1).

10. A valve seat sealing structure as described in any one of claims 1-9, characterized in that, The axial thickness of the sealing ring (2) is 1.2-2.5 times that of the support ring (1).

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