CN218913817U

CN218913817U - Valve seat sealing cavity structure

Info

Publication number: CN218913817U
Application number: CN202221931959.3U
Authority: CN
Inventors: 谈玉英; 白纪耘; 潘建新
Original assignee: Shanghai Hongshen Special Valve Manufacturing Co ltd
Current assignee: Shanghai Hongshen Special Valve Manufacturing Co ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2023-04-25
Anticipated expiration: 2032-07-26

Abstract

The utility model relates to a sealing structure of a valve, in particular to a valve seat sealing cavity structure which is arranged in the valve and sleeved on the valve seat, wherein the sealing cavity structure sequentially comprises a sealing assembly, a pre-tightening piece and a sealing assembly from outside to inside; the sealing assembly comprises a sealing ring and a sealing support ring; the sealing ring is located the outside of sealed cavity structure, and the sealing support circle sets up between sealing ring and pretension piece. Compared with the prior art, the utility model has the advantages that the sealing cavity structure is formed into a whole through the combined action of the sealing component and the pretension piece, so that the sealing of the sealing ring can be realized, and meanwhile, the powder in the flow channel can be effectively sealed in a dustproof manner; further cooperate the design of sealing member on the disk seat, can realize double-deck sealed, provide better sealed effect for the ball valve.

Description

Valve seat sealing cavity structure

Technical Field

The utility model relates to a sealing structure of a valve, in particular to a valve seat sealing cavity structure.

Background

The valve is a control component in the fluid conveying system and has the functions of stopping, adjusting, guiding, preventing backflow, stabilizing pressure, diverting or overflow pressure relief and the like. The sealing performance of the valve refers to the capability of each sealing part of the valve for preventing medium leakage, and is the most important technical performance index of the valve. The sealing part of the valve mainly comprises three parts: the contact part between the opening and closing piece and the two sealing surfaces of the valve seat; the matching part of the filler, the valve rod and the stuffing box; the junction of the valve body and the valve cover. The first of these is called internal leakage, known as a loose seal, which affects the ability of the valve to intercept the medium. The leakage of the two latter parts can be called as leakage, namely, the medium leaks from the inside of the valve to the outside of the valve, the leakage can cause material loss, environmental pollution and accidents in severe cases. It follows that the valve must have reliable sealing properties.

The sealing condition of the valve seat sealing surface of the valve plays a vital role in the valve, at present, the sealing is usually carried out by adopting a mode of packing before and after the valve seat, but the dustproof sealing effect of the method is poor, once the valve seat cavity is filled with powder media, the powder media can enter the valve seat cavity, and then the spring pretightening force is possibly invalid, the sealing capability of the valve seat sealing ring is damaged or the valve seat cannot move slightly.

Especially for the high-frequency valve, the superfine powder of the high-frequency valve has certain self-aggregation, is extremely easy to accumulate in the gap of the valve parts, further causes the blocking and even the blocking of the valve, further causes the sealing failure of the valve and the valve failure, and seriously affects the industrial production. Therefore, the conventional packing sealing method is difficult to accomplish sealing in valves such as high frequency valves, and a new sealing chamber structure is required to accomplish sealing of the valves.

Disclosure of Invention

The present utility model has been made to solve at least one of the above problems, and an object of the present utility model is to provide a valve seat seal chamber structure capable of effectively preventing powder from entering the valve seat seal chamber and achieving effective sealing of the valve seat portion and the valve.

The aim of the utility model is achieved by the following technical scheme:

the valve seat sealing cavity structure is arranged in the valve and sleeved on the valve seat, and comprises a sealing assembly, a pre-tightening piece and a sealing assembly from outside to inside in sequence;

the sealing assembly comprises a sealing ring and a sealing support ring; the sealing ring is positioned at the outermost side of the sealing cavity structure, and the sealing support ring is arranged between the sealing ring and the pre-tightening piece.

Preferably, the pre-tightening piece comprises a spring piece and a gasket, and the spring piece is arranged at two sides of the gasket. The pretension piece is used for applying pretension force to the sealing assembly, so that a better sealing effect and effective sealing time can be provided for the sealing cavity structure and the valve.

Preferably, the spring member is a disc spring. The disc spring has the advantages of large load, short stroke and small required space, is very suitable for being used in the sealing cavity structure, and provides excellent and continuous pretightening force for the sealing assembly.

Preferably, the seal cavity structure further comprises a seal member, the valve seat is provided with a groove, and the seal member is fixedly arranged in the groove. Through the setting of seal assembly and the setting of sealing member, provide double-deck sealed for the disk seat, provide more excellent sealed effect.

Preferably, the sealing element is an O-ring.

Preferably, the sealing cavity structure is of a circular ring structure and is sleeved on the valve seat.

Preferably, the valve is a ball valve, and a valve body of the ball valve is arranged in the valve seat.

Preferably, the valve seats are provided with a pair which are symmetrically arranged on the valve body; the sealing cavity structure is provided with a pair of sealing cavities which are respectively sleeved on the two valve seats.

Preferably, the valve seat is also provided with a cutting knife, and the front end of the cutting knife is propped against the surface of the valve body. The scaling or dirt on the surface of the sphere can be effectively scraped by the cutter.

Preferably, the cutting blade is annularly fixed to the valve seat. The cutting knife arranged in the replacement way can act on the surface of the valve body simultaneously in the rotating process of the valve body so as to remove dirt.

Compared with the prior art, the utility model has the following beneficial effects:

1. the sealing cavity structure is formed into a whole through the combined action of the sealing component and the pre-tightening piece, so that the sealing of the sealing ring can be realized, and meanwhile, powder in the flow channel can be effectively sealed in a dustproof manner; further cooperate the design of sealing member on the disk seat, can realize double-deck sealed, provide better sealed effect for the ball valve.

2. The annular cutting knife is fixed on the inner side edge of the valve seat, dirt adhered on the surface of the valve body of the ball valve can be removed when the valve body rotates, self-cutting descaling is realized, the effective service life of the valve can be prolonged, and the cleaning and maintenance times of the valve can be reduced to a certain extent.

3. The disc spring is adopted as a component for applying the pretightening force, the disc spring can be subjected to personalized design according to the force and the space volume which are applied as required, and can be independently replaced when part of reeds fail, so that the disc spring is very convenient, has large load and is suitable for being used in the sealing cavity structure.

Drawings

FIG. 1 is a schematic view of the overall structure of a ball valve in an embodiment;

FIG. 2 is a schematic view of the structure of a valve seat seal chamber portion of a ball valve in an embodiment;

in the figure: 1-a sealing ring; 2-sealing a supporting ring; 3-washers; 4-spring elements; 5-a seal; 6-valve seat; 7-valve body.

Detailed Description

The utility model will now be described in detail with reference to the drawings and specific examples.

Examples

The valve seat sealing cavity structure is arranged in the valve and sleeved on the valve seat 6, and as shown in fig. 1 and 2, the sealing cavity structure sequentially comprises a sealing component, a pre-tightening piece and a sealing component from outside to inside;

the sealing assembly comprises a sealing ring 1 and a sealing support ring 2; the sealing ring 1 is located at the outermost side of the sealing cavity structure, and the sealing support ring 2 is arranged between the sealing ring 1 and the pre-tightening piece.

More specifically, in the present embodiment:

as shown in fig. 1, the valve in this embodiment is a ball valve, the upper and lower ends of the ball valve are respectively provided with a valve seat 6, and the sealing cavity structure is respectively sleeved on the boss parts of the upper and lower valve seats 6 to realize sealing.

The sealing cavity structure is integrally formed by sealing assemblies on two sides and a pretension piece arranged in the center, and the pretension piece provides pretension force for the sealing assemblies on two sides so as to provide enough sealing performance after being sleeved on the valve seat 6. The sealing assembly comprises a sealing ring 1 and a sealing stay ring 2, and the pre-tightening piece comprises a gasket 3 and a spring piece 4 (a disc spring is selected as the spring piece in the embodiment); as shown in fig. 2, the sealing ring 1, the sealing stay ring 2, the spring member 4, the gasket 3, the spring member 4, the sealing stay ring 2 and the sealing ring 1 are sequentially arranged from left to right. An annular groove is formed in the upper plane of the boss of the valve seat 6, a sealing element 5 is fixedly arranged in the groove, an O-shaped sealing ring is adopted as the sealing element 5 in the embodiment, and the sealing element 5 and a sealing assembly are matched together to enable the sealing cavity structure to be combined with axial sealing and radial sealing to form double-layer sealing.

A cutting knife is also fixed at the inner side edge of the valve seat 6, and the front end tool bit of the cutting knife is abutted against the side surface of the valve body 7 of the ball valve, so that scaling on the surface of the valve body 7 can be scraped off when the valve body 7 rotates; furthermore, the cutting blade also adopts an annular design, so that the valve body 7 can be comprehensively descaled when the valve body 7 rotates.

The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present utility model. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present utility model is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present utility model.

Claims

1. The valve seat sealing cavity structure is arranged in a valve and sleeved on a valve seat (6), and is characterized in that the sealing cavity structure sequentially comprises a sealing component, a pre-tightening piece and a sealing component from outside to inside;

the sealing assembly comprises a sealing ring (1) and a sealing support ring (2); the sealing ring (1) is positioned at the outermost side of the sealing cavity structure, and the sealing support ring (2) is arranged between the sealing ring (1) and the pre-tightening piece.

2. A valve seat seal cavity structure according to claim 1, wherein said pretension member comprises a spring member (4) and a gasket (3), said spring member (4) being arranged on both sides of the gasket (3).

3. A valve seat seal arrangement according to claim 2, wherein the spring member (4) is a disc spring.

4. A valve seat seal cavity structure according to claim 1, further comprising a sealing member (5), wherein the valve seat (6) is provided with a groove, and the sealing member (5) is fixedly arranged in the groove.

5. A valve seat seal arrangement according to claim 4, wherein the sealing member (5) is an O-ring.

6. A valve seat seal cavity structure according to claim 1, characterized in that the seal cavity structure is a ring-shaped structure and is sleeved on the valve seat (6).

7. A valve seat seal arrangement according to claim 1, characterized in that the valve is a ball valve, the valve body (7) of which is mounted in the valve seat (6).

8. A valve seat seal cavity structure according to claim 7, characterized in that the valve seat (6) is provided with a pair, symmetrically arranged to the valve body (7); the sealing cavity structure is provided with a pair of sealing cavities which are respectively sleeved on the two valve seats (6).

9. A valve seat sealing cavity structure according to claim 7, characterized in that the valve seat (6) is further provided with a cutting knife, and the front end of the cutting knife is propped against the surface of the valve body (7).

10. A valve seat seal arrangement according to claim 9, wherein the cutting blade is annularly fixed to the valve seat (6).