CN212407646U

CN212407646U - Valve seat with pressure memory function and ball valve thereof

Info

Publication number: CN212407646U
Application number: CN202020683821.0U
Authority: CN
Inventors: 蔡毅; 杨积海; 吴显金; 周星彪
Original assignee: TEJI VALVE GROUP CO Ltd
Current assignee: TEJI VALVE GROUP CO Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2021-01-26
Anticipated expiration: 2030-04-29

Abstract

The utility model provides a disk seat and ball valve thereof with pressure memory function belongs to the ball valve field, and it includes disk seat body, valve body, through the sealed cooperation of the main sealed C type circle and the vice sealed C type circle valve body of interval distribution between the inboard one end of disk seat body and the valve body, the well side of disk seat body or lean on outside and valve body matched with step face, be provided with the elastic regulating piece that direction of regulation and medium flow direction are parallel between step face and the valve body, near the outside of disk seat body is equipped with external seal structure or sealing washer and the sealed cooperation of valve body. The utility model discloses it is external with the elasticity regulating part, make its middle part that is located the disk seat body or lean on outer one side, seal, design external seal structure in the outside of disk seat body through two C type circles in the inboard of disk seat body simultaneously, realize two way seal to the elasticity regulating part, prevent effectively that the dust from getting into, prolonging the life of disk seat and ball valve.

Description

Valve seat with pressure memory function and ball valve thereof

Technical Field

The utility model relates to a ball valve field, in particular to disk seat and ball valve with pressure memory function.

Background

The existing hard sealing ball valve is used for conveying fixed particles, such as polysilicon, coal dust and the like, dust is easy to accumulate at a plate spring, and after the ball valve is used for a period of time, the plate spring is clamped and stagnated, and a valve seat body loses an adjusting effect and causes the reduction of the sealing property of the ball valve. Moreover, powder enters a gap between the valve body and the valve seat body, so that the valve seat body is clamped and stuck, and the ball valve cannot be closed seriously.

Based on this, the present application is proposed.

Disclosure of Invention

Not enough to prior art, the utility model provides a ball valve with pressure memory function, during dust easily got into the clearance between leaf spring and valve body and the disk seat body among the solution prior art, caused jump ring and/or disk seat body jamming, lead to the ball valve to be difficult to inclosed problem.

In order to achieve the purpose, the utility model provides a ball valve with pressure memory function, it includes valve seat body, valve body and spheroid, the inboard one end of valve seat body and valve body clearance fit, clearance fit department is equipped with interval distribution's main seal C type circle and vice seal C type circle sealed, main seal C type circle and vice seal C type circle sealed both ends respectively with valve seat body, valve body clearance fit; the middle side or the outer side of the valve seat body is provided with a step surface matched with the valve body, and an elastic adjusting piece with the adjusting direction parallel to the medium flow direction is arranged between the step surface and the valve body; and an outer sealing structure or a sealing ring is arranged near the elastic adjusting piece and the outer side of the valve seat body and is in sealing fit with the valve body, and the outer sealing structure is positioned on the outer side of the elastic adjusting piece.

In the above structure, the inner side of the valve seat body is the side opposite to the position of the ball body and in close contact with the valve body, and the outer side is the side close to the position of the ball body. The utility model discloses it is external with the elasticity regulating part, make its middle part that is located the disk seat body or lean on outer one side, seal, design external seal structure in the outside of disk seat body through two C type circle in the inboard of disk seat body simultaneously, realize two way seal to the elasticity regulating part to prevent that the dust from getting into. And because the elastic adjusting piece is arranged on the step surface, and a certain distance which needs to be bent is arranged between the elastic adjusting piece and the inner side of the valve seat body, the difficulty that dust enters the elastic adjusting piece after invading from the inner side of the valve seat body is raised, and the failure of the elastic adjusting piece caused by the fixed particles entering the elastic adjusting piece is further reduced.

Because of the existence of the double C-shaped rings, the entering highest pressure can be intercepted between the main sealing C-shaped ring and the auxiliary sealing C-shaped ring, thereby realizing the memory function of the highest pressure, and the inner side of the valve seat body and the valve body are always in a pressure self-sealing state, which also ensures the sealing effect between the inner side of the valve seat body and the valve body. And after the highest pressure is memorized in the annular groove between the main sealing C-shaped ring and the auxiliary sealing C-shaped ring, the effective thrust of the valve seat body can be continuously stabilized, so that the valve seat body is continuously and tightly contacted with the ball, the valve seat body is converted into a type similar to static sealing from the piston motion type, the static sealing can thoroughly eliminate the possible clamping stagnation of the piston motion, and the fatigue of the sealing material caused by the piston motion is thoroughly eliminated.

For the installation, the utility model discloses further set up as follows: the elastic adjusting piece is a plate spring, and the plate spring is small in installation space, high in response speed and elastic hardness and suitable for being used for a hard sealing ball valve.

The utility model discloses further set up as follows: the outer circles of the main sealing C-shaped ring and the auxiliary sealing C-shaped ring are respectively in contact fit with the valve body or a covering part fixed on the valve body.

The utility model discloses further set up as follows: the sealed gaps of the main sealing C-shaped ring and the auxiliary sealing C-shaped ring are arranged oppositely.

For the sealed relative interval of restriction main seal C type circle and vice sealed C type circle and respective mounted position, the utility model discloses further set up as follows: and a convex part on the end surface of the inner side of the valve seat body is embedded in the interval between the main sealing C-shaped ring and the auxiliary sealing C-shaped ring.

The utility model discloses further set up as follows: the outer sealing structure comprises a screw, a pressing plate, a split ring and a flexible stopper, the pressing plate is adjustably fixed on the valve seat body through the screw, one end of the flexible stopper is clamped between the valve seat body and the split ring, and the other end of the flexible stopper extends to the valve body from the valve seat body and is in clearance fit or interference fit with the valve body to achieve sealing connection. One end of the inner diameter of the split ring is matched with the pressure plate to cause the flexible stopper to expand outwards. According to the structure, the outer sealing structure is designed on the front side of the plate spring close to the sphere, the feeding amount is controlled through the screwing-in depth of the adjusting screw, and the force is transferred by combining the pressing plate, so that the split ring and the flexible stopper are expanded outwards, the flexible stopper is contacted with the cavity wall of the valve body, and fixed particles are prevented from entering the position of the elastic adjusting part.

The utility model discloses further set up as follows: in the outer sealing structure, an elastic gasket is arranged between the pressure plate and the valve seat body and is used for buffering the pressure plate and the split ring, so that the pressure plate and the screw are kept in tight contact, the pressure loss caused by the direct contact of the pressure plate and the valve seat body is reduced, the pressing effect of the pressure plate on the split ring is improved, and the sealing effect is ensured.

The utility model discloses further set up as follows: the elastic gasket is preferably a disc spring, the mounting space of the disc spring is small, the elastic hardness is high, and the disc spring is suitable for transmitting pressure timely and effectively and is also suitable for a hard ball valve.

The utility model discloses further set up as follows: the flexible stopper is a graphite plate, the graphite plate has good flexibility, and when the flexible stopper is in contact with the wall of the valve body cavity, the flexible stopper can play a role in sealing better than an O-shaped ring or a rubber ring under a contact matching structure provided by the outer sealing structure.

Another object of the utility model is to provide a ball valve with pressure memory function, including spheroid and the above any kind of disk seat that has pressure memory function, be equipped with sealed face on the disk seat body, the spheroid is as an organic whole through sealed face and disk seat seal assembly. Owing to adopted above-mentioned disk seat, the utility model discloses the sealing performance of ball valve can improve, life can prolong.

The utility model has the advantages as follows: the utility model adopts the technical scheme that the elastic adjusting piece is arranged in the front, a double C-shaped ring is designed at the inner side for memorizing the highest pressure and realizing the self-sealing of the pressure, and a sealing structure is designed at the outer side for sealing, so that the elastic adjusting piece is firmly isolated between an inner sealing defense line and an outer sealing defense line, thereby effectively preventing fixed particles such as dust and the like from entering the elastic adjusting piece and between the valve seat body and the valve body and further preventing the sealing failure of the ball valve; and through the pressure self-sealing effect, the valve seat body is converted from a piston motion type to a static sealing type, so that the clamping stagnation problem possibly existing in the piston motion is eliminated, the fatigue of the sealing material due to the piston motion is avoided, the service life of the ball valve is greatly prolonged, and the ball valve is simple in structure, convenient to realize, and good in application value and economical efficiency.

Drawings

FIG. 1 is a schematic view of a prior art valve seat assembly.

Fig. 2 is the structural schematic diagram of the valve seat assembly of the present invention.

Fig. 3 is a schematic view of the valve seat of the present invention.

Fig. 4 is a schematic view of the structure of the C-shaped ring of the present invention.

Reference numerals: 100-ball, 200-valve seat body, 300-valve body, 400-wedge-shaped sealing ring, 500-leaf spring, 610-screw, 620-elastic gasket, 630-pressing plate, 640-split ring, 650-flexible stopper, 710-main seal C-shaped ring, 720-auxiliary seal C-shaped ring, 800-cover part, 810-flow guide surface, 210-first valve seat inner side wall, 220-outer valve seat side wall, 230-valve seat bottom surface, 240-bulge part, 241-seal groove, 241-second valve seat inner side wall, 310-valve body surface, 320-first valve body side wall, 330-second valve body side wall, 321-installation groove.

Detailed Description

Embodiment 1 as shown in fig. 2, the present embodiment provides a ball valve with a pressure memory function, which includes a valve seat body 200, a valve body 300 and a ball 100, wherein the valve seat body 200 and the valve body 300 are matched by a step structure: the first valve seat inner side wall 210 of the valve seat body 200 on the right side in fig. 2 is spaced opposite to the first valve body side wall 320 of the valve body 300. The middle part of the left side end of the valve seat body 200 is provided with a protruding part 240 protruding leftwards, the left side end face of the protruding part 240 is a second valve seat inner side wall 241, the second valve seat inner side wall 241 is opposite to the second valve body side wall 330 of the valve body 300 at intervals, and an upper sealing groove 241 and a lower sealing groove 241 for installing sealing elements are formed between the non-protruding part 240 of the left side end of the valve seat and the second valve body side wall 330. The middle connecting section on the valve seat for connecting the first valve seat inner side wall 210 and the second valve seat inner side wall 241 is in clearance fit with the middle connecting section for connecting the first valve body side wall 320 and the second valve body side wall 330. The primary seal C-ring 710 and the secondary seal C-ring 720 are sealingly mounted in the two seal grooves 241. And a main sealing C-shaped ring 710 and a secondary sealing C-shaped ring 720 which are distributed at intervals are arranged at the interval between the second valve seat inner side wall 241 and the second valve body side wall 330 for sealing, and a bulge part 240 is arranged on the end surface of the inner side of the valve seat body 200. The two sealed ends of the main sealing C-shaped ring 710 and the auxiliary sealing C-shaped ring 720 are in clearance fit with the second valve seat inner side wall 241 and the second valve body side wall 330 respectively, furthermore, the outer circle of the main sealing C-shaped ring 710 is in contact fit with one upper surface of the valve body 300 respectively, and the outer circle of the auxiliary sealing C-shaped ring 720 is in contact fit with one covering piece 800 fixed on the valve body 300, so that a plane compression sealing mode is formed. In the structure, the sealing gaps of the main sealing C-shaped ring 710 and the auxiliary sealing C-shaped ring 720 are arranged oppositely.

The covering piece 800 is used for providing the cover for vice sealed C type circle 720 on the one hand, and the route between the installation hole that its and vice sealed C type circle 720 were located is tortuous to covering piece 800 sets up in a direction that is parallel to the medium, can effectively block the dust and avoid fixed particulate matters such as dust to enter into vice sealed C type circle 720 and cause vice sealed C type circle 720 jamming. The cover 800, on the other hand, allows for the passage of media pressure into the secondary seal C-ring 720 and the annular groove to effect a pressure self-seal. Preferably, the front end of the cover 800 in the medium flowing direction is provided with an inclined flow guide surface 810, and the medium is made to flow forward by the inclined flow guide effect and to flow backward by the inclined surface to prevent dust from entering the gap between the cover 800 and the valve seat body 200 as much as possible.

In this embodiment, the first valve seat inner wall 210 spaced apart from the first valve body sidewall 320 of the valve body 300 is disposed on the middle side of the valve seat body 200, the first valve body sidewall 320 is provided with a mounting groove 321 for mounting the plate spring 500, and the plate spring 500 having a regulating direction parallel to the medium flow direction is mounted in the mounting groove 321. On the right side of the plate spring 500, an outer sealing structure is provided for sealing the gap between the valve seat bottom surface 230 and the valve body surface 310 shown in fig. 1, and blocking the passage of dust into the plate spring 500.

With continued reference to fig. 1, the outer sealing structure includes a screw 610, a pressure plate 630, a split ring 640, a resilient gasket 620 and a flexible stopper 650, the pressure plate 630 is "L" shaped and is flush-mounted against a corner of the valve seat body 200, which is detachably and fixedly connected with the valve seat outer side wall 220 (shown as a right end surface in figure 1) of the valve seat body 200 through an elastic gasket 620 and a screw 610, the pressing plate 630 is perpendicular to the other end of the above-mentioned components and clamps the upper end of the split ring 640 and the upper end of the flexible stopper 650 together on the valve seat body 200 by the screw 610 and the elastic washer 620, the graphite plate is not bound with the lower end of the split ring 640, but under the pressing action of the screw and the disc spring, the split ring 640 and the flexible stopper 650 are expanded outward in opposite directions (relative to the pressing force of the screw 610 against the pressing plate 630), and the lower end of the flexible stopper 650 is controlled to extend onto the valve body 300 to achieve a sealing connection with the valve body 300 in a clearance-free fit or interference fit. The structure greatly simplifies the structure of the valve seat body 200, and when in use, the feeding amount of the screw is preset according to the distance between the valve seat body 200 and the cavity wall of the valve body 300, so that the flexible stopper 650 can be just in sealing connection with the valve body surface 310 when expanding.

In this embodiment, the elastic pad 620 is preferably a disc spring, which has a small installation space and high elastic hardness for convenient use. Furthermore, the flexible stopper 650 is a graphite plate, which has good flexibility, and the sealing effect of the flexible stopper in contact and matching with the valve body surface 310 is good, so that dust can be effectively prevented from entering the flexible stopper.

In this embodiment, the specific principle of implementing pressure trapping and self-compensation is as follows:

first, a main sealing C-ring 710 and a sub sealing C-ring 720 installed between the valve seat body 200 and the valve body 300 can realize low pressure sealing by pre-compressing the two C-rings.

When the pipe is filled with the medium, the medium pressure enters the outer circle of the auxiliary sealing C-shaped ring 720 through the gap between the valve seat body 200 and the valve body 300, and then the two ends of the auxiliary sealing C-shaped ring 720 are compressed, so that the medium pressure can enter the annular groove between the main sealing C-shaped ring 720 and the auxiliary sealing C-shaped ring. Because the outer circle of the main sealing C-shaped ring 710 (the outer side wall at the opposite side of the notch of the C-shaped ring) is in contact with the valve body 300, the valve body 300 can provide a supporting and reacting force, so that the main sealing C-shaped ring 710 is pressed and opened, and two ends of the main sealing C-shaped ring 710 are respectively in contact fit with the second valve seat inner side wall 241 and the second valve body side wall 330 to realize pressure self-sealing.

And thirdly, when the pressure in the pipeline is equal to the pressure of the annular groove (namely, the annular gap formed by the interval distribution) between the main sealing C-shaped ring 720 and the auxiliary sealing C-shaped ring 720, the pressure is not further input at the position of the auxiliary sealing C-shaped ring 720.

Fourthly, when the pressure in the pipeline is smaller than the pressure of the annular groove between the main sealing C-shaped ring 720 and the auxiliary sealing C-shaped ring 720, the excircle of the auxiliary sealing C-shaped ring 720 is limited by the valve body 300 or the covering piece 800 fixed on the valve body 300, the auxiliary sealing C-shaped ring 720 is opened, and the two ends of the auxiliary sealing C-shaped ring are respectively in contact fit with the second valve seat inner side wall 241 and the second valve body side wall 330 to realize pressure self-sealing.

And fifthly, when the pressure in the pipeline is higher than the pressure of the annular groove between the main sealing C-shaped ring 720 and the auxiliary sealing C-shaped ring 720, the medium pressure enters the auxiliary sealing C-shaped ring 720 and the annular groove again as described in the second point, so that the main sealing C-shaped ring 710 is pressed and opened again to realize pressure self-sealing (the second point is repeated).

In the process, the highest pressure entering the valve seat body can be intercepted between the main sealing C-shaped ring 720 and the auxiliary sealing C-shaped ring 720, so that the memory function of the highest pressure is realized, and the memory function of the highest pressure further enables the main sealing C-shaped ring 710 and the auxiliary sealing C-shaped ring 720 to intercept a certain pressure all the time, so that the inner side of the valve seat body 200 and the valve body 300 can be always in a pressure self-sealing state, and the continuous and stable effective thrust of the sealing effect and the valve seat body 200 is further ensured.

In addition, in this embodiment, the primary sealing C-ring 710 and the secondary sealing C-ring 720 may be made of a metal material, preferably stainless steel or aluminum alloy. The covering member 800 may be made of the same material as the valve body 300, or may be made of a polymer having a certain rigidity, such as glass fiber reinforced plastic.

Embodiment 2 referring to fig. 2, the present embodiment provides a ball valve with a pressure memory function, which includes a ball 100 and a valve seat with a pressure memory function as described in embodiment 1, wherein a sealing surface is provided on a valve seat body 200, and the ball 100 is sealingly assembled with the valve seat through the sealing surface. Owing to adopted in embodiment 1 the disk seat that has pressure memory function, the utility model discloses the ball valve can "remember" the highest pressure in the use and seal with the highest pressure to ensure the sealing performance of ball valve, keep smooth and easy use of ball valve, the life of extension ball valve.

The utility model discloses well open ring is equipped with the open-ended annular member for the middle part for provide certain packing force and plane supporting role for flexible separation blade.

To sum up, the utility model provides a can realize pressure memory through trapped pressure and carry out disk seat and ball valve of pressure self-sealing, it is close to static seal with the dynamic seal conversion of disk seat body 200 through trapped pressure and pressure self-sealing effect to thoroughly eliminate the condition that the dust got into leaf spring 500 from the inboard of disk seat body 200 and caused its jamming, eliminate sealing material's fatigue simultaneously from this, improve durability, increase of service life.

Claims

1. The utility model provides a disk seat with pressure memory function, includes disk seat body, valve body, the inboard one end and the valve body clearance fit of disk seat body, its characterized in that: the clearance fit part is provided with main sealing C-shaped ring and auxiliary sealing C-shaped ring seals which are distributed at intervals, and two ends of the main sealing C-shaped ring and the auxiliary sealing C-shaped ring seals are respectively in clearance fit with the valve seat body and the valve body; the middle side or the outer side of the valve seat body is provided with a step surface matched with the valve body, and an elastic adjusting piece with the adjusting direction parallel to the medium flow direction is arranged between the step surface and the valve body; and an outer sealing structure or a sealing ring is arranged near the elastic adjusting piece and the outer side of the valve seat body and is in sealing fit with the valve body, and the outer sealing structure is positioned on the outer side of the elastic adjusting piece.

2. The valve seat with pressure memory function according to claim 1, wherein: the outer circles of the main sealing C-shaped ring and the auxiliary sealing C-shaped ring are respectively in contact fit with the valve body or a covering part fixed on the valve body.

3. The valve seat with pressure memory function according to claim 2, wherein: the sealed gaps of the main sealing C-shaped ring and the auxiliary sealing C-shaped ring are arranged oppositely.

4. The valve seat with pressure memory function according to any one of claims 1 to 3, wherein: and a convex part on the end surface of the inner side of the valve seat body is embedded in the interval between the main sealing C-shaped ring and the auxiliary sealing C-shaped ring.

5. The valve seat with pressure memory function according to claim 1, wherein: the elastic adjusting piece is a plate spring, and the plate spring is small in installation space, high in response speed and elastic hardness and suitable for being used for a hard sealing ball valve.

6. The valve seat with pressure memory function according to claim 1, wherein: the outer sealing structure comprises a screw, a pressing plate, a split ring and a flexible stopper, the pressing plate is adjustably fixed on the valve seat body through the screw, one end of the flexible stopper is clamped between the valve seat body and the split ring, and the other end of the flexible stopper extends to the valve body from the valve seat body and is in clearance fit or interference fit with the valve body to achieve sealing connection.

7. The valve seat with pressure memory function according to claim 6, wherein: in the outer sealing structure, an elastic gasket is arranged between the pressure plate and the valve seat body.

8. The valve seat with pressure memory function according to claim 7, wherein: the elastic gasket is a disc spring.

9. The valve seat with pressure memory function according to claim 6, wherein: the flexible stopper is a graphite plate.

10. The utility model provides a ball valve with pressure memory function which characterized in that: the pressure memory valve comprises a ball and the valve seat with the pressure memory function as claimed in any one of claims 1 to 8, wherein a sealing surface is arranged on the valve seat body, and the ball and the valve seat are assembled into a whole in a sealing mode through the sealing surface.