Cold-mounted multilayer elastic sealing valve seat

Abstract

According to the cold-mounted multilayer elastic sealing valve seat, an inclined sealing conical surface is arranged at the top of the inner circumferential wall of a valve seat body, an annular cavity is formed in a valve seat inner body in the circumferential direction of the valve seat inner body, and the sealing conical surface is communicated with the annular cavity to form a first opening; the sealing ring of a hollow structure is arranged in the annular cavity, part of the sealing ring protrudes out of the first opening, and a second opening is formed in the sealing ring in the circumferential direction. The first opening is not overlapped with the second opening in the radial direction; the scheme has the following advantages that through cold fitting interference fit between the inner valve seat and the outer valve seat, the advantages that the contact finger spring provides supporting force and introduces high-pressure side pressure into the sealing ring from the second opening are combined, and the sealing performance and the abrasion resistance of the sealing ring are remarkably improved; a compensation structure of the contact finger spring effectively prolongs the service life of the valve and reduces sealing failure caused by abrasion; the maintenance cost is reduced due to the quick replacement design, and the maintainability of the valve is improved; the method is suitable for harsh working conditions such as high temperature, high pressure and corrosive media.

Description

TECHNICAL FIELD

[0001] The utility model relates to the valve sealing field, especially is cold dress formula multilayer elastic sealing valve seat. BACKGROUND

[0002] The domestic track ball valve seat adopts the metal surfacing structure or the soft sealing structure, and the valve seat structure of the track ball valve of the foreign OBIRT company is that the metal O-shaped ring is welded to the valve seat base body and high-pressure nitrogen is filled in the inner cavity, and the elasticity compensation is provided for the ball core and the valve seat sealing, and the two structures have the following problems at present.

[0003] 1, the metal surfacing valve seat cannot realize long-period sealing: when the medium temperature or pressure changes, the gap between the valve seat sealing surface and the ball core is easy to produce, which leads to sealing failure;

[0004] 2, the non-metal valve seat has poor erosion resistance: the valve seat is easy to wear in the medium containing particles, which leads to the damage of the sealing surface;

[0005] 3, the remanufacturing is difficult: for the nitrogen-filled valve seat structure, the domestic scheme has not been solved and localized.

[0006] In summary, for the existing track ball valve seat structure, the valve seat of the surfacing metal type structure cannot meet the requirements of strict cut-off leakage level and has the problem of difficult maintenance for the nitrogen-filled valve seat structure, and how to realize the elastic sealing of the valve seat becomes a problem that researchers in the field urgently need to solve. INVENTION CONTENTS

[0007] The technical problem to be solved by the utility model is how to realize the elastic sealing of the valve seat;

[0008] To solve the above technical problems, the technical scheme adopted by the utility model is:

[0009] The utility model discloses a cold dress formula multilayer elastic sealing valve seat, which comprises a valve seat body, the inner peripheral wall top of the valve seat body is provided with an inclined sealing conical surface, a ring cavity is formed in the valve seat body along the circumferential direction, the sealing conical surface is in communication with the ring cavity and forms a first opening, a sealing ring with a hollow structure is arranged in the ring cavity, part of the sealing ring protrudes from the first opening, the sealing ring is provided with a second opening along the circumferential direction, and the first opening does not coincide with the second opening in the radial direction.

[0010] Further, a finger spring is arranged in the sealing ring.

[0011] Furthermore, the valve seat body includes: an outer valve seat, which has an inclined first sealing cone surface on its top inner wall, and its inner wall is divided into a first inner wall portion and a second inner wall portion. The second inner wall portion is located axially below the first inner wall portion. The inner diameter of the first inner wall portion is smaller than the diameter of the second inner wall portion, and a limiting platform is formed between the first inner wall portion and the second inner wall portion. A first annular protrusion is provided radially inward on the second inner wall portion of the outer valve seat; an inner valve seat is disposed at the second inner wall portion of the outer valve seat, which has an inclined second sealing cone surface on its top inner wall, and its top has a positioning platform that makes surface contact with the limiting platform. A second annular protrusion is provided radially inward on the positioning platform; a first opening is formed between the first sealing cone surface and the second sealing cone surface; and a sealing ring is located in the annular cavity formed by the top of the positioning platform, the inner side of the second inner wall portion, and the first and second annular protrusions.

[0012] Furthermore, the second opening abuts against the first annular protrusion.

[0013] Furthermore, the inner valve seat and the outer valve seat are cold-fitted interference fit.

[0014] The beneficial effects of this utility model are as follows: This utility model is a cold-installed multi-layer elastic sealing valve seat, and this solution has the following advantages:

[0015] (1) By using the cold-fitting interference fit between the inner and outer valve seats, combined with the advantages of the contact spring providing support force and introducing the high-pressure side pressure from the second opening to the sealing ring, the sealing performance and wear resistance of the sealing ring are significantly improved.

[0016] (2) The compensation structure of the contact finger spring effectively extends the service life of the valve and reduces sealing failure caused by wear.

[0017] (3) The quick-change design reduces maintenance costs and improves valve maintainability;

[0018] (4) It is suitable for harsh working conditions such as high temperature, high pressure, and corrosive media, and has a wide range of application prospects. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a cross-sectional view of the present invention;

[0021] Figure 2 This is a diagram showing the fit between the utility model and the ball core;

[0022] Figure 3 This is a diagram showing the fit between the inner and outer valve seats;

[0023] Figure 4This is a diagram showing the fit between the sealing ring and the contact spring;

[0024] Figure 5 This is a schematic diagram of the external valve seat;

[0025] Figure 6 This is a schematic diagram of the internal valve seat. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0027] like Figure 3 As shown, this embodiment is a cold-installed multi-layer elastic sealing valve seat, including a valve seat body 1. A sealing cone surface 2, which is wider at the top and narrower at the bottom, is provided on the inner wall of the top of the valve seat body. The sealing cone surface 2 is not continuously provided. The sealing cone surface 2 is inclined inward and has an annular cavity 3 inside the valve seat body 1. The annular cavity 3 is not sealed. A first opening 4 is formed between the annular cavity 3 and the sealing cone surface 2. The annular cavity is connected to the outside by providing the first opening 4.

[0028] like Figure 4 As shown, the sealing ring 5 is a hollow structure, and has an axial second opening 51, through which the inner and outer parts of the sealing ring 5 are connected; as Figure 1 , 2 As shown, the sealing ring 5 is disposed in the ring cavity 3. The portion of the sealing ring 5 located at the first opening 4 protrudes from the sealing cone surface 2, and this portion is used for the ball core 01 to perform a sealing.

[0029] When the ball core 01 rotates to the sealing ring 5 at the first opening 4, the sealing ring 5 deforms inward, and the medium on the high-pressure side enters the ring cavity 3 and enters the sealing ring 5 from the second opening 51 of the sealing ring 5. This reduces the pressure difference between the inside and outside of the sealing ring 5, ensuring that the sealing ring 5 is not excessively deformed and compressed by the medium, so that the sealing ring 5 can always fit the ball core 01, thus ensuring the sealing performance.

[0030] Of course, the first opening 4 and the second opening 51 should not be set to overlap. If they are set to overlap, the sealing performance of the second opening 51 of the sealing ring and the ball core 01 will be poor.

[0031] like Figure 4 As shown, in some possible embodiments, a finger spring 6 is provided inside the sealing ring 5;

[0032] In this embodiment, a contact spring is provided inside the sealing ring. The contact spring can provide support and elasticity to the sealing ring to compensate for changes in medium temperature and dimensional changes caused by wear on the sealing surface of the sealing ring, ensuring that the valve seat and the ball core are always in close contact.

[0033] like Figure 3 , 4 As shown in Figures 5 and 6, in some possible embodiments, the valve seat body 1 includes: an outer valve seat 11, with an inclined first sealing cone surface 21 provided on its top inner wall, and its inner wall distributed as a first inner wall portion 12 and a second inner wall portion 13. The second inner wall portion 13 is located axially below the first inner wall portion 12. The inner diameter of the first inner wall portion 12 is smaller than the diameter of the second inner wall portion 13, and a limiting platform 14 is formed between the first inner wall portion 12 and the second inner wall portion 13. A first annular protrusion 1 is provided radially inward on the second inner wall portion 13. 5; An inner valve seat 16 is provided at the second inner wall portion 13 of the outer valve seat, and an inclined second sealing cone surface 22 is provided at the top inner wall of the inner valve seat. The top of the inner valve seat has a positioning platform 17 that is in surface contact with the limiting platform 14. A second annular protrusion 18 is provided on the radially inner side of the positioning platform 17. The first opening 4 is formed between the first sealing cone surface 21 and the second sealing cone surface 22. The sealing ring 5 is located in the annular cavity 3 formed by the top of the positioning platform 17, the inner side of the second inner wall portion 12, the first annular protrusion 15, and the second annular protrusion 18.

[0034] In this embodiment, the valve seat body 1 is composed of an inner valve seat 16 and an outer valve seat 11. The limiting platform 14 of the outer valve seat 11 and the top positioning platform 17 of the inner valve seat 16 form a surface contact, which limits the axial position between the inner valve seat 16 and the outer valve seat 11. A first annular protrusion 15 is provided at the outer valve seat 11, and a second annular protrusion 18 is provided at the top of the inner valve seat 16. Thus, the sealing ring 5 is disposed in the annular cavity 3 formed between the first annular protrusion 15, the second annular protrusion 18, the top of the positioning platform 17, and the second inner wall portion 12.

[0035] like Figure 1 As shown, in some possible embodiments, the second opening 51 abuts against the first annular protrusion 15.

[0036] In this embodiment, when the sealing ring 5 is installed in the ring cavity 3, the opening position of the second opening 51 is defined. The second opening 51 is preferably abutted against the first annular protrusion 15. That is, for the left side of the sealing ring 5, the second opening 51 is opened at the upper left of the sealing ring 5. In this way, the right side of the sealing ring 5 abuts against the ball core 01 and deforms. The high-pressure medium will enter the sealing ring 5 through the first opening 51 from the gap between the sealing ring 5 and the first annular protrusion 15. In this way, the high-pressure medium can enter the sealing ring 5 relatively easily and provide support for the sealing ring 5.

[0037] like Figure 3 As shown, in some possible embodiments, the inner valve seat 16 and the outer valve seat 11 are cold-fitted interference fits.

[0038] In this embodiment, the outer valve seat 11 and the inner valve seat 16 are fitted with an interference fit. After the inner valve seat 16 is immersed in cryogenic liquid nitrogen, the fit gap between it and the outer valve seat 11 is eliminated by cold assembly to ensure sealing performance.

[0039] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A cold-installed multi-layer elastic sealing valve seat, characterized in that, include: The valve seat body has an inclined sealing cone surface at the top of its inner peripheral wall. An annular cavity is formed in the circumferential direction of the valve seat body. The sealing cone surface is connected to the annular cavity and forms a first opening. A hollow sealing ring is disposed within the ring cavity, a portion of the sealing ring protrudes from the first opening, and a second opening is circumferentially provided on the sealing ring. The first opening does not coincide with the second opening in the radial direction.

2. The cold-fitting multi-layer elastic sealing valve seat according to claim 1, characterized in that, A finger spring is provided inside the sealing ring.

3. The cold-fitting multi-layer elastic sealing valve seat according to claim 1, characterized in that, The valve seat body includes: The outer valve seat has an inclined first sealing cone surface on its top inner wall. Its inner wall is divided into a first inner wall portion and a second inner wall portion. The second inner wall portion is located axially below the first inner wall portion. The inner diameter of the first inner wall portion is smaller than the diameter of the second inner wall portion. A limiting platform is formed between the first inner wall portion and the second inner wall portion. The second inner wall portion has a first annular protrusion radially inward. An inner valve seat located on the second inner wall of the outer valve seat has an inclined second sealing cone surface on its top inner wall and a positioning platform at its top that makes surface contact with the limiting platform. A second annular protrusion is provided on the radially inner side of the positioning platform. The first opening is formed between the first sealing cone surface and the second sealing cone surface; The sealing ring is located in the annular cavity formed by the top of the positioning platform, the inner side of the second inner wall, and the first and second annular protrusions.

4. The cold-fitting multi-layer elastic sealing valve seat according to claim 3, characterized in that, The second opening abuts against the first annular protrusion.

5. The cold-fitting multi-layer elastic sealing valve seat according to claim 3, characterized in that, The inner and outer valve seats are cold-fitted with an interference fit.

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