CN219975445U - Valve seat sealing structure and pipeline ball valve - Google Patents

Abstract

The utility model relates to a valve seat sealing structure and a pipeline ball valve, wherein the valve seat sealing structure is arranged between a valve body and a ball body of the ball valve, and the valve seat sealing structure comprises: a retainer outer ring for connection with the valve body; the inner fixer ring is annularly arranged on the inner side of the outer fixer ring, and an accommodating space is reserved between the outer wall of the inner fixer ring and the inner wall of the outer fixer ring; the sealing piece is annularly arranged in the accommodating space; the springs are respectively positioned on two sides of the sealing piece, and the springs are abutted against the end face of the first side of the sealing piece so as to push the end face of the second side of the sealing piece to be in sealing fit with the outer wall of the ball body. The utility model solves the technical problem of poor sealing stability of the valve seat of the ball valve.

Description

Valve seat sealing structure and pipeline ball valve

Technical Field

The utility model relates to the field of valves, in particular to a valve seat sealing structure and a pipeline ball valve.

Background

Pipeline ball valves are used as key control elements in long-distance pipelines and play an indispensable important role in natural gas pipeline transportation. With the rapid development of the natural gas industry, pipeline ball valve technology is greatly improved, parameters such as valve pressure, caliber and the like are increased year by year, natural gas is inflammable and explosive, when the large-caliber pipeline ball valve is overhauled, if internal leakage occurs under the cutting-off working condition of the pipeline ball valve, a relief valve behind the valve still has natural gas medium due to continuous internal leakage, and when overhauling, the natural gas medium is usually cut, detached and the like, spark is easily caused, and serious safety accidents and casualties are easily caused.

At present, as shown in fig. 1 and 2, a sealing structure of a valve seat in a pipeline ball valve is characterized in that a circular ring-shaped fixer 300 is arranged between a valve body 100 and a ball 200, a circular ring-shaped accommodating groove 400 is formed in the end face of the fixer 300, which faces the ball 200, along the circumferential direction of the fixer 300, a sealing ring 500 is arranged in the accommodating groove 400, at least part of the sealing ring 500 is positioned outside the accommodating groove 400, so that the sealing ring 500 can be in sealing fit with the ball 200, a plurality of springs 600 are arranged in the end face of the fixer 300, which faces away from the ball 200, along the circumferential direction of the fixer 300, the springs 600 are compressed between the fixer 300 and the valve body 100, and initial pretightening force is provided for the sealing ring 500 through the springs 600, so that the sealing ring 500 can be in a sealing connection state with the ball 200 is ensured.

But this kind of seal structure's drawback lies in: because the sealing ring 500 is in interference fit with the accommodating groove 400 on the fixer 300, an oil press is needed to press in when the sealing ring 500 is installed in the accommodating groove 400, and because the sealing ring 500 and the inner wall of the accommodating groove 400 are both in fit and sealing (namely, the outer wall of the sealing ring 500 and the inner wall corresponding to the accommodating groove 400 are end face sealing), in the process of pressing in the sealing ring 500, in order to exhaust air in the accommodating groove 400, at least one (generally four evenly distributed) exhaust grooves are needed to be formed on the outer wall of the sealing ring 500 and/or the inner wall of the accommodating groove 400 so as to prevent air in the accommodating groove 400 from being exhausted outside through the exhaust grooves. In the later use process, the exhaust groove can also become a leakage channel, so that stable sealing between the valve seat and the ball body cannot be ensured, and potential safety hazards exist. In addition, whether the seal ring 500 and the ball 200 can be stably sealed is mainly determined by the elastic force of the spring 600, and in the application scene of the high-pressure large-caliber valve, deformation failure of the spring 600 is easily caused when the pressure is too large, and the sealing effect is lost.

Aiming at the problem of poor sealing stability of a valve seat of a ball valve in the related art, no effective solution is provided at present.

Therefore, the inventor has put forward a valve seat sealing structure and a pipeline ball valve by virtue of experience and practice of related industries for many years so as to overcome the defects of the prior art.

Disclosure of Invention

The utility model aims to provide a valve seat sealing structure and a pipeline ball valve, which are used for improving the sealing stability between a valve seat and a ball body, eliminating the problems of sealing leakage and spring compression failure and ensuring the long-term and stable working state of the ball valve.

The object of the utility model can be achieved by the following scheme:

the utility model provides a valve seat sealing structure, which is arranged between a valve body and a ball body of a ball valve, and comprises:

a retainer outer ring for connection with the valve body;

the inner fixer ring is annularly arranged on the inner side of the outer fixer ring, and an accommodating space is reserved between the outer wall of the inner fixer ring and the inner wall of the outer fixer ring;

the sealing piece is annularly arranged in the accommodating space;

the springs are respectively positioned on two sides of the sealing piece, and the springs are abutted against the end face of the first side of the sealing piece so as to push the end face of the second side of the sealing piece to be in sealing fit with the outer wall of the ball body.

In a preferred embodiment of the present utility model, a sealing section and a connecting section are sequentially formed on the outer wall of the inner ring of the fixer from the direction close to the sphere to the direction far away from the sphere, the sealing element is located on the sealing section, and the inner side wall surface of the sealing element is tightly attached to the sealing section;

the connecting section is radially protruded out of the sealing section of the inner ring of the fixer, the connecting section is provided with a containing groove, the spring is positioned in the containing groove, and two ends of the spring are respectively abutted against the inner wall of the containing groove and the end face of the first side of the sealing piece.

In a preferred embodiment of the utility model, a first spacer is provided on the end face of the first side of the seal, the spring pressing the seal via the first spacer.

In a preferred embodiment of the present utility model, the connecting section is provided with a pressure inlet hole axially communicated with the accommodating groove, the pressure inlet hole is used for communicating with the inlet of the valve body, a second gasket is arranged in the accommodating groove and located between the pressure inlet hole and the accommodating groove, and two ends of the spring are respectively abutted against the second gasket and the first gasket.

In a preferred embodiment of the present utility model, the number of the accommodating grooves is plural, each of the accommodating grooves is uniformly distributed at intervals along the circumferential direction of the inner ring of the fixer, and each of the accommodating grooves is respectively provided with the spring.

In a preferred embodiment of the utility model, at least one first groove is annularly arranged on the inner side wall surface of the sealing element and/or the sealing section, a first sealing ring is arranged in the first groove in an interference manner, and the first sealing ring is used for sealing between the inner side wall surface of the sealing element and the outer wall of the inner ring of the fixer.

In a preferred embodiment of the present utility model, a first step and a second step are sequentially formed on the inner wall of the outer ring of the fixer from the direction from the position close to the ball to the direction far from the ball, the diameter of the first step is smaller than that of the second step, the sealing element is located on the first step, and the outer side wall surface of the sealing element is tightly attached to the first step;

the second step section is fixedly connected with the connecting section of the inner ring of the fixer.

In a preferred embodiment of the utility model, the second step and the connecting section are connected by threads.

In a preferred embodiment of the utility model, a locking screw is screwed at the connection position between the second step and the connecting section.

In a preferred embodiment of the utility model, a limit shoulder is formed on the annular inner edge of the outer ring of the holder, which is adjacent to one side of the ball, and against which at least part of the end face of the second side of the seal can abut.

In a preferred embodiment of the present utility model, at least a part of the end face of the second side of the sealing member is formed with a matching portion for fitting and sealing with the outer wall of the sphere.

In a preferred embodiment of the present utility model, at least one second groove is formed on the outer side wall surface of the sealing member and/or the first step section in a ring manner, and a second sealing ring is disposed in the second groove in an interference manner, and is used for sealing between the outer side wall surface of the sealing member and the inner wall of the outer ring of the fixer.

In a preferred embodiment of the present utility model, at least one third groove is formed on the outer wall of the outer ring of the retainer, and a third sealing ring is disposed in the third groove in an interference manner, and the third sealing ring is used for sealing between the outer wall of the outer ring of the retainer and the valve body.

The present utility model provides a pipeline ball valve comprising:

a valve body having an inlet and an outlet communicating with the flow passage, the flow passage being formed inside the valve body;

the ball body is arranged in the valve body and controls the on-off of the overflow channel;

at least two above-mentioned disk seat seal structure, one disk seat seal structure seal set up near the entrance the inner wall of valve body with between the outer wall of spheroid, another disk seat seal structure seal set up near the exit the inner wall of valve body with between the outer wall of spheroid.

From the above, the valve seat sealing structure and the pipeline ball valve of the utility model have the characteristics and advantages that: the valve seat sealing structure comprises a fixer outer ring, a fixer inner ring, a sealing element and a spring, wherein the fixer outer ring is used for being connected with the valve body, the fixer inner ring is arranged on the inner side of the fixer outer ring, a containing space is reserved between the outer wall of the fixer inner ring and the inner wall of the fixer outer ring, the sealing element is arranged in the containing space in a surrounding manner, the spring is arranged to abut against the end face of the first side of the sealing element, the end face of the second side of the sealing element is pushed by the spring to be in sealing fit with the outer wall of the ball body, the assembling position of the sealing element is provided by the cooperation of the fixer outer ring and the fixer inner ring, and the sealing element is not required to be installed in a pressing-in manner, so that the setting of an exhaust groove between the sealing element and the fixer can be canceled, the hidden danger of sealing leakage is eliminated, the sealing stability between the valve seat sealing structure and the ball body is improved, and good sealing effect is ensured; in addition, the spring in the utility model applies thrust to the sealing element, so that stable sealing of the sealing element and the ball body is ensured, and the integral thrust to the fixer and the sealing element is not required, so that the deformation of the spring is not influenced even if the valve pressure is too large, the problem of spring failure is avoided, and the ball valve is ensured to be in a long-term and stable working state.

Drawings

The following drawings are only for purposes of illustration and explanation of the present utility model and are not intended to limit the scope of the utility model. Wherein:

fig. 1: is a structural schematic diagram of a pipeline ball valve in the prior art.

Fig. 2: an enlarged view of a portion of the valve seat seal structure in position a of fig. 1.

Fig. 3: is a structural schematic diagram of the pipeline ball valve.

Fig. 4: an enlarged view of a portion of the valve seat seal structure in position B of fig. 3.

Fig. 5: is a front cross-sectional view of the inner ring of the retainer in the valve seat sealing structure of the present utility model.

Fig. 6: is a right side view of the inner ring of the retainer in the valve seat sealing structure of the present utility model.

Fig. 7: is a front cross-sectional view of the outer ring of the retainer in the valve seat sealing structure of the present utility model.

Fig. 8: is a front cross-sectional view of a sealing ring in the valve seat sealing structure.

The reference numerals in the background art are:

100. a valve body; 200. A sphere;

300. a holder; 400. A receiving groove;

500. a seal ring; 600. And (3) a spring.

The reference numerals in the utility model are:

1. a valve body; 101. An inlet;

102. an outlet; 2. A sphere;

3. an inner retainer ring; 301. A sealing section;

302. a connection section; 303. A receiving groove;

304. a pressure inlet hole; 4. A retainer outer ring;

401. a first step; 402. A second step;

403. a limit shoulder; 404. A third groove;

5. a seal; 501. A matching section;

502. a second groove; 503. A first groove;

6. a spring; 7. A first gasket;

8. a second gasket; 9. A locking screw;

10. a third seal ring; 11. A second seal ring;

12. a first seal ring.

Detailed Description

For a clearer understanding of technical features, objects, and effects of the present utility model, a specific embodiment of the present utility model will be described with reference to the accompanying drawings.

Embodiment one

As shown in fig. 3 to 8, the present utility model provides a valve seat sealing structure provided between a valve body 1 and a ball 2 of a ball valve, the valve seat sealing structure including a retainer outer ring 4, a retainer inner ring 3, a seal 5, and a spring 6, the retainer outer ring 4, the retainer inner ring 3, and the seal 5 each being circular, the retainer outer ring 4 being for connection with the valve body 1; the inner ring 3 of the fixer is arranged on the inner side of the outer ring 4 of the fixer (namely, the outer ring 4 of the fixer is sleeved on the outer side of the inner ring 3 of the fixer), the inner ring 3 of the fixer and the outer ring 4 of the fixer are concentric, a circular containing space is reserved between the outer wall of the inner ring 3 of the fixer and the inner wall of the outer ring 4 of the fixer, the sealing element 5 is arranged in the containing space in a surrounding manner, the springs 6 and the ball 2 are respectively positioned on two sides of the sealing element 5, the springs 6 are propped against the end face of the first side of the sealing element 5 so as to push the end face of the second side of the sealing element 5 (the two opposite end faces of the sealing element 5 are respectively the end face of the first side of the sealing element 5 and the end face of the second side of the sealing element 5) to be in sealing fit with the outer wall of the ball 2.

The fixing outer ring 4 is fixedly connected with the valve body 1, and a specific connection manner between the fixing outer ring 4 and the valve body 1 is not limited herein, for example: the outer ring 4 of the fixer is fixedly clamped with the valve body 1, or the outer ring 4 of the fixer is fixedly welded with the valve body 1, or the outer ring 4 of the fixer is fixedly arranged with the valve body 1 through a fixing piece of a screw, so that the valve seat sealing structure is stably connected with the valve body 1.

In the utility model, the valve seat sealing structure comprises a fixer outer ring 4, a fixer inner ring 3, a sealing element 5 and a spring 6, wherein the fixer outer ring 4 is used for being connected with the valve body 1, the fixer inner ring 3 is annularly arranged on the inner side of the fixer outer ring 4, a containing space is reserved between the outer wall of the fixer inner ring 3 and the inner wall of the fixer outer ring 4, the sealing element 5 is annularly arranged in the containing space, the spring 6 is propped against the end face of the first side of the sealing element 5, and the end face of the second side of the sealing element 5 is pushed by the spring 6 to be in sealing fit with the outer wall of the ball body 2, so that the sealing assembly between the ball body 2 and the valve body 1 is realized. According to the utility model, the outer ring 4 of the fixer is matched with the inner ring 3 of the fixer to provide an assembling position for the sealing element 5, and the sealing element 5 is not required to be installed in a pressing mode, so that the arrangement of an exhaust groove between the sealing element 5 and the fixer can be canceled, the hidden danger of sealing leakage is eliminated, the sealing stability between a valve seat sealing structure and a ball body is improved, and a good sealing effect is ensured; in addition, the spring 6 in the utility model applies thrust to the sealing element 5, so that stable sealing of the sealing element 5 and the ball body 2 is ensured, and the integral thrust to the fixer and the sealing element 5 is not required, so that the spring 6 is not influenced even if the valve pressure is too large, the bending deformation of the spring 6 is not caused, the problem of failure of the spring 6 is avoided, and the ball valve is ensured to be in a long-term and stable working state.

In an alternative embodiment of the present utility model, as shown in fig. 4 to 6, a sealing section 301 and a connecting section 302 are sequentially formed on the outer wall of the inner ring 3 of the holder from the direction close to the ball 2 to the direction far away from the ball 2, the sealing member 5 is located on the sealing section 301 in the axial direction, and the inner side wall surface of the sealing member 5 is closely attached to the connecting section 302; the connecting section 302 protrudes from the sealing section 301 in the radial direction of the inner ring 3 of the fixer (i.e. the connecting section 302 is an annular boss arranged along the circumferential direction of the inner ring 3 of the fixer), the connecting section 302 is provided with a containing groove 303 which is open towards the sealing member 5 along the circumferential direction, the spring 6 is positioned in the containing groove 303, one end of the spring 6 is propped against the inner wall of the containing groove 303, and the other end of the spring 6 is propped against the end face of the first side of the sealing member 5. The spring 6 provides thrust for the sealing element 5 (namely, the elastic force of the spring 6) so as to ensure that the end face of the second side of the sealing element 5 can be in sealing fit with the outer wall of the sphere 2, and ensure the sealing effect.

Further, as shown in fig. 3, a first spacer 7 is provided on the end face of the first side of the seal member 5, and the spring 6 presses the seal member 5 through the first spacer 7. Through the setting of first gasket 7, can avoid spring 6 and the terminal surface direct contact of the first side of sealing member 5, and then avoid direct contact to cause the damage to sealing member 5. Wherein the first spacer 7 may be, but is not limited to, an annular metal sheet cooperating with the spring 6.

In an alternative embodiment of the present utility model, as shown in fig. 4 to 6, a pressing hole 304 is formed on the connecting section 302 and is axially connected to the accommodating groove 303, the aperture of the pressing hole 304 is smaller than the inner diameter of the accommodating groove 303, the pressing hole 304 is used for being connected to the inlet 101 of the valve body 1, a second gasket 8 is disposed in the accommodating groove 303 and located between the pressing hole 304 and the accommodating groove 303, the second gasket 8 can block the connection position between the pressing hole 304 and the accommodating groove 303, and in the embodiment provided with the first gasket 7 and the second gasket 8, one end of the spring 6 is propped against the second gasket 8, and the other end of the spring 6 is propped against the first gasket 7. The medium (gas or liquid) entering from the inlet 101 of the valve body 1 can enter the pressure inlet 304 and act on the second gasket 8, and the second gasket 8 provides pressure for the spring 6, so as to provide specific sealing pressure for the sealing element 5, and further improve the sealing effect of the sealing element 5 and the ball body 2. Wherein the second gasket 8 may be, but is not limited to, a circular metal sheet.

Further, as shown in fig. 6, the number of the accommodating grooves 303 is plural, the accommodating grooves 303 are uniformly distributed at intervals along the circumferential direction of the inner ring 3 of the holder, the more the number of the accommodating grooves 303 is, the more densely distributed the accommodating grooves 303 are in the circumferential direction of the inner ring 3 of the holder, the more uniform the thrust of the spring 6 is applied to the seal member 5 as a whole, and the better the seal effect between the seal member 5 and the ball 2 is. Wherein the spring 6 may be, but is not limited to, a cylindrical coil spring.

Further, as shown in fig. 4 and 8, at least one first groove 503 is formed on the inner side wall surface of the sealing member 5 in a ring manner, a first sealing ring 12 is provided in the first groove 503 in an interference manner, and the first sealing ring 12 is used for sealing between the inner side wall surface of the sealing member 5 and the outer wall of the inner ring 3 of the fixer, so as to ensure the sealing between the inner side wall surface of the sealing member 5 and the outer wall of the inner ring 3 of the fixer after the sealing member 5 is assembled. Of course, the first groove 503 may also be disposed on the sealing section 301, or the first groove 503 may be disposed on both the inner side wall surface of the sealing member 5 and the sealing section 301, where the first groove 503 is disposed to provide a mounting position for the first sealing ring 12, so as to achieve a sealing effect between the inner side wall surface of the sealing member 5 and the outer wall of the inner ring 3 of the holder.

In an alternative embodiment of the present utility model, as shown in fig. 4 and 7, a first step 401 and a second step 402 are sequentially formed on the inner wall of the outer ring 4 from the direction close to the ball 2 to the direction far away from the ball 2 (i.e. the inner hole of the outer ring 4 of the retainer is a stepped hole), the diameter of the first step 401 is smaller than that of the second step 402, the sealing element 5 is located in the first step 401 in the axial direction, and the outer side wall surface of the sealing element 5 is closely attached to the first step 401, namely: the sealing member 5 is circumferentially opposite to the sealing section 301 of the retainer inner ring 3 and the first stepped section 401 of the retainer outer ring 4, respectively, so that the inner side wall surface of the sealing member 5 can be tightly fitted with the connecting section 302, and the outer side wall surface of the sealing member 5 can be tightly fitted with the first stepped section 401, so that the sealing member 5 is sealingly fitted between the retainer inner ring 3 and the retainer outer ring 4.

Further, as shown in fig. 4, the second step 402 of the outer ring 4 of the fastener is fixedly connected with the connecting section 302 of the inner ring 3 of the fastener by threads. Specifically, the connecting section 302 of the inner ring 3 of the fixer is provided with external threads, the second step section 402 of the outer ring 4 of the fixer is provided with internal threads matched with the external threads, and the outer ring 4 of the fixer is matched and connected with the inner ring 3 of the fixer through the internal threads so as to achieve the purpose of convenient assembly.

Further, as shown in FIG. 4, a locking screw 9 is screwed on the connection position (i.e., the thread engagement surface) between the second step 402 and the connection section 302. By adding the locking screw 9, the outer ring 4 and the inner ring 3 are integrated into a rigid connection, so that the screw thread between the second step 402 of the outer ring 4 and the connecting section 302 of the inner ring 3 is prevented from loosening.

In an alternative embodiment of the utility model, as shown in fig. 4 and 7, a limiting shoulder 403 protruding toward the central axis is formed at the annular inner edge of the outer ring 4 of the holder near one side of the ball 2, and at least a part of the end surface of the second side of the sealing member 5 can be positioned against the limiting shoulder 403, and the limiting shoulder 403 plays a role in limiting the position of the sealing member 5.

Further, as shown in fig. 4 and 7, at least a part of the end surface of the second side of the seal 5 is formed with a mating portion 501, and the mating portion 501 is used to seal against the outer wall of the ball 2. The matching portion 501 may be a slope matching with the shape of the outer wall of the ball 2 to ensure a good sealing effect.

Further, as shown in fig. 4 and 8, at least one second groove 502 is formed on the outer side wall surface of the sealing element 5 in a ring manner, and a second sealing ring 11 is provided in the second groove 502 in an interference manner, and the second sealing ring 11 is used for sealing between the outer side wall surface of the sealing element 5 and the inner wall of the outer ring 4 of the fixer, so that the sealing between the outer side wall surface of the sealing element 5 and the inner wall of the outer ring 4 of the fixer after the sealing element 5 is assembled is ensured. Of course, the second groove 502 may also be disposed on the first step 401, or the second groove 502 may be disposed on both the outer side wall surface of the sealing member 5 and the first step 401, where the second groove 502 is disposed to provide a mounting position for the second sealing ring 11, so as to achieve a sealing effect between the outer side wall surface of the sealing member 5 and the inner wall of the outer ring 4 of the holder.

In the utility model, due to the arrangement of the first sealing ring 12 and the second sealing ring 11, a certain gap is reserved between the inner wall of the sealing element 5 and the inner wall of the inner ring 3 of the fixer and between the outer wall of the sealing element 5 and the outer wall of the outer ring 4 of the fixer, so that the clearance fit between the sealing element 5 and the fixer is realized, and different assembly modes are adopted compared with the traditional sealing element.

In an alternative embodiment of the present utility model, as shown in fig. 4 and 7, at least one third groove 404 is formed on the outer wall of the outer ring 4 of the retainer, and a third sealing ring 10 is disposed in the third groove 404 in an interference manner, where the third sealing ring 10 is used for sealing between the outer wall of the outer ring 4 of the retainer and the valve body 1.

The assembly steps of the valve seat sealing structure of the utility model are as follows:

step S1: respectively installing a plurality of second gaskets 8 at the bottom of each accommodating groove 303 on the inner ring 3 of the fixer;

step S2: a plurality of springs 6 are respectively arranged in the accommodating grooves 303 on the inner ring 3 of the fixer;

step S3: respectively installing first gaskets 7 at positions corresponding to the springs 6, so that second gaskets 8 and first gaskets 7 are respectively positioned at two ends of the springs 6;

step S4: the first sealing ring 12 and the second sealing ring 11 are respectively arranged in the first groove 503 and the second groove 502 of the sealing piece 5;

step S5: fitting the seal 5 inside the holder outer ring 4 and fitting the seal 5 into position against the stop shoulder 403;

step S6: fitting the retainer outer ring 4 and the retainer inner ring 3 by screw fitting until the left end face of the retainer outer ring 4 is flush with the left end face of the retainer inner ring 3 (or the left end of the first step 401 of the retainer outer ring 4 abuts against the right end of the connecting section 302 of the retainer inner ring 3) as in fig. 4;

step S7: a plurality of threads are drilled at the thread connecting surface (namely, a riding joint) between the outer ring 4 of the fixer and the inner ring 3 of the fixer, and the plurality of threads are circumferentially spaced and uniformly distributed; wherein the number of the threaded holes is at least three;

step S8: and (5) screwing locking screws 9 into the threaded holes to complete the installation of the valve seat sealing structure.

The valve seat sealing structure has the characteristics and advantages that:

1. compared with the traditional connection mode of interference fit between the sealing element and the metal fixer, the valve seat sealing structure provided by the utility model has the advantages that the sealing element 5 and the fixer (namely, the fixer inner ring 3 and the fixer outer ring 4) are in clearance fit, so that the convenience of installation is improved.

2. In the valve seat sealing structure, the sealing element 5 is sealed with the inner ring 3 of the fixer and the outer ring 4 of the fixer through the sealing ring, compared with the traditional end face sealing, the valve seat sealing structure has a more stable sealing effect, and leakage accidents are avoided.

3. In the valve seat sealing structure, the spring 6 directly acts on the sealing element 5, compared with the traditional structure that the spring acts on the whole fixer and the sealing element, the utility model can improve the sealing specific pressure, eliminate the adverse effect on the sealing ring caused by the bending moment of the head part of the fixer under the spring force, and ensure that the spring 6 cannot be pressed to generate bending deformation.

4. Compared with the traditional pipeline ball valve, the valve seat sealing structure is additionally provided with the pressure inlet hole 304 communicated with the accommodating groove 303, the compression amount of the spring 6 is increased by means of the thrust of a medium, and then the sealing effect of the sealing element 5 and the ball body 2 is improved, and the sealing performance is improved.

5. Compared with the traditional pipeline ball valve, the valve seat sealing structure limits the sealing element in a lathe edging mode, and the limiting shoulder 403 is additionally arranged, so that the lathe edging uncertainty and the irremovable property are eliminated.

Second embodiment

As shown in fig. 3 and fig. 4, the present utility model provides a pipeline ball valve, the pipeline ball valve includes a valve body 1, a ball 2 and at least two valve seat sealing structures, wherein an overflow channel is formed inside the valve body 1, two ends of the valve body 1 are respectively provided with an inlet 101 and an outlet 102 (of course, positions of the inlet 101 and the outlet 102 can be changed), the inlet 101 and the outlet 102 are both communicated with the overflow channel, the ball 2 is disposed in the valve body 1, the ball 2 is used for controlling on-off of the overflow channel (wherein, specific assembly relation between the ball 2 and the valve body 1 and control of the ball 2 are all in the prior art, and are not repeated here), one valve seat sealing structure is disposed between an inner wall of the valve body 1 close to the inlet 101 and an outer wall of the ball 2, and the other valve seat sealing structure is disposed between an inner wall of the valve body 1 close to the outlet 102 and an outer wall of the ball 2.

The foregoing is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this utility model, and are intended to be within the scope of this utility model.

Claims (14)

1. A valve seat sealing structure, it sets up between the valve body and the spheroid of ball valve, its characterized in that, valve seat sealing structure includes:

a retainer outer ring for connection with the valve body;

the inner fixer ring is annularly arranged on the inner side of the outer fixer ring, and an accommodating space is reserved between the outer wall of the inner fixer ring and the inner wall of the outer fixer ring;

the sealing piece is annularly arranged in the accommodating space;

the springs are respectively positioned on two sides of the sealing piece, and the springs are abutted against the end face of the first side of the sealing piece so as to push the end face of the second side of the sealing piece to be in sealing fit with the outer wall of the ball body.

2. The valve seat sealing structure according to claim 1, wherein a sealing section and a connecting section are sequentially formed on the outer wall of the inner ring of the fixer from the direction from the position close to the ball body to the direction away from the ball body, the sealing element is positioned on the sealing section, and the inner side wall surface of the sealing element is tightly attached to the sealing section;

the connecting section is radially protruded out of the sealing section of the inner ring of the fixer, the connecting section is provided with a containing groove, the spring is positioned in the containing groove, and two ends of the spring are respectively abutted against the inner wall of the containing groove and the end face of the first side of the sealing piece.

3. The valve seat sealing structure according to claim 2, wherein a first spacer is provided on an end face of the first side of the seal member, and the spring presses the seal member through the first spacer.

4. The valve seat sealing structure according to claim 3, wherein the connecting section is provided with a pressure inlet hole communicated with the accommodating groove along the axial direction, the pressure inlet hole is used for being communicated with the inlet of the valve body, a second gasket is arranged in the accommodating groove and positioned between the pressure inlet hole and the accommodating groove, and two ends of the spring are respectively propped against the second gasket and the first gasket.

5. The valve seat sealing structure according to claim 2, wherein the number of the accommodation grooves is plural, each of the accommodation grooves is spaced apart and uniformly distributed along the circumferential direction of the retainer inner ring, and each of the accommodation grooves is provided with the spring, respectively.

6. The valve seat sealing structure according to claim 2, wherein at least one first groove is formed in the inner side wall surface of the sealing element and/or the sealing section in a surrounding mode, a first sealing ring is arranged in the first groove in an interference mode, and the first sealing ring is used for sealing between the inner side wall surface of the sealing element and the outer wall of the inner ring of the fixer.

7. The valve seat sealing structure according to claim 2, wherein a first step and a second step are formed on the inner wall of the outer ring of the retainer in sequence from the direction from the position close to the ball body to the direction away from the ball body, the diameter of the first step is smaller than that of the second step, the sealing element is positioned on the first step, and the outer side wall surface of the sealing element is tightly attached to the first step;

the second step section is fixedly connected with the connecting section of the inner ring of the fixer.

8. The valve seat sealing structure according to claim 7, wherein the second step and the connecting section are connected by threads.

9. The valve seat sealing structure according to claim 8, wherein a locking screw is screwed at a connection position between the second step and the connection section.

10. The valve seat sealing structure according to claim 7, wherein a limit shoulder is formed at an annular inner edge of the retainer outer ring adjacent to one side of the ball, at least a portion of an end face of the second side of the seal being positioned against the limit shoulder.

11. A valve seat sealing structure as claimed in claim 7 or 10, wherein at least a part of the end face of the second side of the seal member is formed with a mating portion for fitting with the outer wall of the ball body.

12. The valve seat sealing structure according to claim 7, wherein at least one second groove is formed in the outer side wall surface of the sealing element and/or the first step section in a ring mode, a second sealing ring is arranged in the second groove in an interference mode, and the second sealing ring is used for sealing between the outer side wall surface of the sealing element and the inner wall of the outer ring of the fixer.

13. The valve seat sealing structure according to claim 7, wherein at least one third groove is formed on the outer wall of the outer ring of the retainer, and a third sealing ring is arranged in the third groove in an interference manner, and is used for sealing between the outer wall of the outer ring of the retainer and the valve body.

14. A pipeline ball valve, characterized in that the pipeline ball valve comprises:

a valve body having an inlet and an outlet communicating with the flow passage, the flow passage being formed inside the valve body;

the ball body is arranged in the valve body and controls the on-off of the overflow channel;

at least two valve seat sealing structures according to any one of claims 1 to 13, one of said valve seat sealing structures being sealingly arranged between an inner wall of said valve body adjacent said inlet and an outer wall of said sphere, and the other of said valve seat sealing structures being sealingly arranged between an inner wall of said valve body adjacent said outlet and an outer wall of said sphere.