CN213982073U

CN213982073U - Valve core sealing structure and valve thereof

Info

Publication number: CN213982073U
Application number: CN202022350728.0U
Authority: CN
Inventors: 周忠云; 贾琦月; 史沫; 殷铭阳; 杨大军
Original assignee: China Huanqiu Contracting and Engineering Corp; Chongqing Chuanyi Control Valve Co Ltd
Current assignee: China Huanqiu Contracting and Engineering Corp; Chongqing Chuanyi Control Valve Co Ltd
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-08-17
Anticipated expiration: 2030-10-20

Abstract

The utility model relates to a valve structure field, concretely relates to case seal structure and valve thereof, wherein, a case seal structure includes case, sealing washer and disk seat, and sealing washer and case lie in same one side of disk seat, are equipped with on the disk seat and compress tightly the piece, compress tightly the piece and press the sealing washer on the disk seat. The valve core sealing structure is applied to the valve, the sealing ring is not easy to damage and easy to replace, and the service life of the valve is prolonged.

Description

Valve core sealing structure and valve thereof

Technical Field

The utility model relates to a valve structure field, concretely relates to case seal structure and valve thereof.

Background

The regulating valve is used as an important control element in a modern factory, the quality and market share of the valve are directly influenced by the leakage grade and the regulating precision of the valve, and the leakage grade is required to reach VI level or even zero leakage under some special working conditions, so the sealing performance of the sealing structure of the valve core in the valve is very important.

As shown in fig. 1, the conventional valve core sealing structure includes a valve seat 3, a valve core 8, a valve core block 5, a sealing ring 4, a gasket 2, a guide ring 7 and a bushing 9, the valve core sealing structure is located in the valve body 1, the sealing ring 4 is generally pressed on the bottom of the valve core 8 through the valve core block 5, the valve core block 5 and the valve core 8 are fixedly connected through an inner hexagon screw 6, the inner hexagon screw 6 is easily loosened and falls off in the long-term reciprocating motion process of the valve, and therefore the sealing effect is affected. Meanwhile, as the valve core block 5 is provided with the threaded connecting hole in a lathing manner, the valve core block 5 and the valve core 8 have high production difficulty and production cost in the processing and production process, and one section of the lower end of the curved surface of the valve core block 5 is flat, so that the adjustment precision is not high when the opening degree is large.

If the sealing ring 4 is fixed in a fixing mode such as welding, the whole set of valve core 8 can only be replaced during maintenance, and therefore the maintenance cost is increased. In addition, when the actuating mechanism thrust on the valve directly acts on the valve core 8, because the valve core 8 and the valve seat 3 are not provided with a structure for limiting the sealing ring 4, when the thrust is too large, the sealing ring 4 is easy to deform, so that the sealing ring 4 is easy to lose efficacy, and the service life of the valve is shortened.

In addition, for the valve with the medium flowing out from the bottom inlet side, the medium impacts the sealing ring 4 on the valve core 8 at a high speed in the opening process of the valve, so that the sealing surface of the sealing ring 4 is easily eroded and damaged, the sealing performance is reduced, and the service life of the valve is further shortened.

SUMMERY OF THE UTILITY MODEL

The utility model discloses it is providing case seal structure to anticipate to improve the life of sealing washer.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the valve core sealing structure comprises a valve core, a sealing ring and a valve seat, wherein the sealing ring and the valve core are positioned on the same side of the valve seat, a pressing piece is arranged on the valve seat, and the sealing ring is pressed on the valve seat by the pressing piece.

The principle and the advantages of the scheme are as follows: when the valve core is pressed on the valve seat, a soft seal is formed between the valve core and the sealing ring, so that a medium is sealed, and the leakage of the medium is reduced or avoided. The sealing ring is arranged on the valve seat, and through the design of the special position of the sealing ring, the medium flows towards the valve core direction, and the sealing ring is not directly opposite to the medium, so that the erosion of the medium to the sealing ring can be effectively avoided, and the service life of the sealing ring is prolonged. Through this scheme, need not to dismantle the connecting valve pellet on the case, whole case is integral design, has reduced the manufacturing cost of case, has avoided simultaneously that interior hex bolts drops, not hard up the relatively poor, the easy damage scheduling problem of valve of sealed effect that causes. The connection position of the screw hole is not reserved on the curved surface of the valve core, and the curved surface can be designed into a curved surface shape with higher adjustment precision, so that the adjustment precision of the valve in large opening is improved.

The sealing washer adopts the mode that compresses tightly the piece and compresses tightly to fix on the disk seat, compares and adopts the sealing washer to weld dead mode, and in follow-up maintenance process, the sealing washer can be followed the disk seat and pulled down, only need change the sealing washer can, need not to change whole case or disk seat, greatly reduced cost of maintenance, it is more convenient that the on-the-spot maintenance is changed, has increased market competition.

Preferably, as an improvement, a placing groove is arranged on the valve seat, and the sealing ring is located in the placing groove. The sealing washer is put in the standing groove, and the standing groove is used for spacing the sealing washer, and the lateral wall of sealing washer offsets with the inner wall of standing groove, and to a certain extent like this, the standing groove can avoid the valve to open the in-process sealing washer and turn over from the standing groove, can effectively avoid the medium to the erosion of sealing washer, has improved the life of sealing washer, and then has improved the life of valve.

Preferably, as a modification, a hard seal is formed between the valve seat and the valve element by a valve wire. The valve line of this scheme case and disk seat cooperation department can protect the sealing washer, has played the effect of first sealed and support case, avoids causing the great and inefficacy of sealing washer deformation volume when actuating mechanism thrust is too big. If when the sealing ring is invalid, the valve can be sealed through the valve line at the matching position of the valve seat and the valve core, so that the sealing reliability of the valve is improved. This scheme is passed through two kinds of sealing methods of sealing washer and valve line, can effectively prolong valve life and improve the valve leakage grade, can reach VI level and leak the requirement even zero.

Preferably, as a refinement, the sealing angle of the valve line is between 25 ° and 35 °. Therefore, the angle of the inclined plane of the valve line is set to be 25-35 degrees, the medium can be effectively guided, the scouring of the medium on the sealing ring is reduced, and meanwhile, the sealing ring is prevented from being damaged due to overlarge shearing force applied to the sealing ring by the valve core in the closing process of the valve.

Preferably, as an improvement, the contact part between the valve core and the sealing ring is designed with a bevel of 1.5-3 degrees. Therefore, the contact position of the valve core and the sealing ring is designed with an inclined plane of 1.5-3 degrees, so that the valve can effectively guide the medium in the opening process, reduce the scouring of the medium on the sealing ring and prolong the service life of the sealing ring.

Preferably, as a refinement, the end of the pressure piece facing the valve slide is provided with a bevel of 40 ° to 50 °. Therefore, the medium can be effectively guided, the scouring of the medium sealing ring is reduced, and the service life of the sealing ring is prolonged.

Preferably, as an improvement, the pressing member is a pressing ring with an L-shaped cross section, the sealing ring is also L-shaped, one end of the sealing ring is located in the placing groove, and the other end of the sealing ring is pressed on the valve seat by the pressing ring. From this, the shape of clamping ring is the annular, and the piece that compresses tightly like this can compress tightly on the circumferencial direction of sealing washer, and the sealing washer can be fixed more stable, firm under the effect of the piece that compresses tightly. The cross-sectional shape design with the sealing washer is L shape, can realize like this that the card of sealing washer is gone into in the standing groove and can be pressed the piece extrusion by compressing tightly, compresses tightly the piece simultaneously and is compressing tightly the removal that the piece can not influence the case yet in the extrusion to the sealing washer.

In addition, this scheme still provides another technical scheme, and this technical scheme relates to the valve that contains case seal structure, includes the valve body and is located the inside guide ring of valve body, and the guide ring is pressed on compressing tightly the piece. From this, adopt the mode of guide ring transmission power to compress tightly the piece, need not to pass through the fix with screw with compressing tightly the piece on the disk seat, it is more convenient to maintain and change.

Preferably, as an improvement, a gasket is provided between the valve body and the valve seat. The gasket is used to improve the sealing performance between the valve seat and the valve body.

Preferably, as an improvement, a valve core shaft is fixedly connected to the valve core, and a bushing is sleeved on the outer side of the valve core shaft. The bush is used for increasing the leakproofness of valve's valve gap and case axle. The bush plays the effect of protection to the valve gap, and the bush can directly be changed after the bush wearing and tearing, need not to change whole valve gap, and the replacement cost is low.

Drawings

Fig. 1 is a schematic view of a prior art cartridge seal structure.

Fig. 2 is a full sectional view of the valve.

Fig. 3 is an enlarged view of B in fig. 2.

Fig. 4 is an enlarged view of a in fig. 3.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the valve comprises a valve body 1, a gasket 2, a valve seat 3, a sealing ring 4, a valve core block 5, a hexagon socket head cap screw 6, a guide ring 7, a valve core 8, a lining 9, a valve body 11, a gasket 12, a valve seat 13, a sealing ring 14, a pressing piece 15, a guide ring 16, a valve core 17 and a lining 18.

Example 1

Substantially as shown in figures 3 to 4 of the accompanying drawings: the valve core sealing structure comprises a valve core 17, a sealing ring 14 and a valve seat 13, wherein the sealing ring 14 and the valve core 17 are both located above the valve seat 13, an annular boss is integrally formed on the upper surface of the valve seat 13, an annular placing groove is formed in the upper surface of the boss of the valve seat 13, the cross section of the sealing ring 14 in the embodiment is L-shaped, and one end, close to the middle of the valve seat 13, of the sealing ring 14 faces downwards and is located in the placing groove. Be equipped with on the disk seat 13 and compress tightly piece 15, compress tightly piece 15 in this embodiment for the clamping ring, the cross sectional shape of clamping ring is L shape, and the one end that compresses tightly piece 15 is close to disk seat 13 middle part is pressed on sealing washer 14, and the other end that compresses tightly piece 15 is located the below of boss to make and compress tightly between piece 15 and the disk seat 13 and closely cooperate. The top of the pressing piece 15 in this embodiment is an extrusion part which is extruded mutually with the bottom of the guide ring 16 on the valve, so that the pressing piece 15 is extruded through the guide ring 16, and the pressing piece 15 extrudes the sealing ring 14, thereby realizing the fixation of the sealing ring 14.

As shown in fig. 4, in the present embodiment, a hard seal is formed between the valve seat 13 and the valve element 17 by a valve wire. Specifically, the sealing angle of the valve line on the valve seat 13 is 25 degrees to 35 degrees, preferably 30 degrees in the embodiment, a slope of 1.5 degrees to 3 degrees is designed at the contact position between the valve core 17 and the sealing ring 14, and a slope of 40 degrees to 50 degrees is arranged at the end of the pressing member 15 facing the valve core 17, preferably 45 degrees in the embodiment.

In this embodiment, a first hard seal is formed between the valve seat 13 and the valve core 17 through a 30-degree valve line, and a second soft seal is formed between the sealing ring 14 and the valve core 17, so that the valve line at the matching position of the valve core 17 and the valve seat 13 can protect the sealing ring 14, the valve line on the valve seat 13 plays a role in supporting the valve core 17, and the sealing ring 14 is prevented from being deformed greatly to fail when the thrust of the actuator is too large. When the sealing ring 14 fails, the valve can be sealed through a valve line at the matching position of the valve seat 13 and the valve core 17, and the sealing reliability of the valve is improved. Therefore, the service life of the valve can be effectively prolonged and the leakage grade of the valve can be improved through the double composite sealing design in the embodiment, and the requirement of VI-grade leakage and even zero leakage can be met.

In this embodiment, the sealing ring 14 is fixed on the valve seat 13 through the pressing part 15, so that the whole sealing ring 14 is arranged at a position where the medium is not easy to wash, and when the medium flows upwards from bottom to top, the erosion of the medium on the sealing ring 14 can be effectively avoided, and the service life of the valve is prolonged. In addition, the contact position of the valve core 17 and the sealing ring 14 is designed with an inclined plane of 1.5-3 degrees, a medium flows out from the bottom to the top in the opening process of the valve, and the medium can be effectively guided by matching with the inclined plane of the 30-degree valve line and the 45-degree inclined plane of the pressing ring, so that the scouring of the medium on the sealing ring 14 is reduced, and the service life of the sealing ring 14 is prolonged.

When the sealing ring 14 is damaged, only the sealing ring 14 needs to be replaced, and the whole valve seat 13 or the valve core 17 does not need to be replaced, so that the maintenance cost is greatly reduced. In the embodiment, the connection position of the screw hole is not reserved on the curved surface of the valve core 17, and the curved surface can be designed into a curved surface shape with higher adjustment precision, so that the adjustment precision of the valve in a large opening degree is improved.

Example 2

This example differs from example 1 in that: the sealing angle of the valve line is 25 degrees, and the inclined plane of the end part of the pressing piece 15 facing the valve core 17 is 40 degrees.

Example 3

This example differs from example 1 in that: the sealing angle of the valve line is 35 degrees, and the inclined plane of the end part of the pressing piece 15 facing the valve core 17 is 50 degrees.

Example 4

The valve comprises a valve body 11 and a guide ring 16 positioned inside the valve body 11, wherein the bottom of the guide ring 16 is provided with an annular pressure groove, and the pressure groove is pressed on the top of a pressing piece 15. A gasket 12 is arranged between the valve body 11 and the valve seat 13, and the gasket 12 in the embodiment is a metal wound gasket. The valve core 17 is integrally formed with a valve core 17 shaft, a bushing 18 is sleeved outside the valve core 17 shaft, and the bushing 18 is positioned in the guide ring 16. The top of the guide ring 16 abuts the top of the valve cover of the valve.

The valve core sealing structure is applied to the valve in the embodiment, so that the service life of the valve is prolonged.

The above description is only an example of the present invention, and the detailed technical solutions and/or characteristics known in the solutions are not described too much here. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. Case seal structure, including case, sealing washer and disk seat, sealing washer and case are located same one side of disk seat, its characterized in that: a pressing piece is arranged on the valve seat and presses the sealing ring on the valve seat; and a hard seal is formed between the valve seat and the valve core through a valve line.

2. The spool seal structure according to claim 1, characterized in that: the valve seat is provided with a placing groove, and the sealing ring is positioned in the placing groove.

3. The spool seal structure according to claim 1, characterized in that: the sealing angle of the valve line is 25-35 degrees.

4. The spool seal structure according to claim 1, characterized in that: the contact part between the valve core and the sealing ring is designed with an inclined plane of 1.5-3 degrees.

5. The spool seal structure according to claim 1, characterized in that: the end part of the pressing piece facing the valve core is provided with a bevel of 40-50 degrees.

6. The spool seal structure according to claim 2, characterized in that: the pressing piece is a pressing ring with an L-shaped cross section, the sealing ring is also L-shaped, one end of the sealing ring is positioned in the placing groove, and the other end of the sealing ring is pressed on the valve seat by the pressing ring.

7. A valve comprising a cartridge sealing structure according to any one of claims 1 to 6, wherein: the valve comprises a valve body and a guide ring positioned in the valve body, wherein the guide ring is pressed on a pressing piece.

8. The valve of claim 7, wherein: and a gasket is arranged between the valve body and the valve seat.

9. The valve of claim 7, wherein: the valve core is fixedly connected with a valve core shaft, and a bushing is sleeved on the outer side of the valve core shaft.