阅读说明：本技术 一种活动密封结构及具有其的球阀 (Movable sealing structure and ball valve with same ) 是由 谢正泽 *** 吴平 叶友海 黄亚光 陈浩 李增有 张炎 于 2020-06-29 设计创作，主要内容包括：本发明提供一种活动密封结构及具有其的球阀,活动密封结构包括：活动安装在阀盖上的阀座,和活动安装在阀球上的活动密封环,其中阀座具有阀座密封面,活动密封环具有阀球密封面,当阀座密封面与阀球密封面紧密结合后,实现密封。本发明的活动密封结构,阀座活动安装设置,能够灵活补偿应对密封面磨损后阀座密封面与阀球密封面间出现的压力减小,避免轻微磨损后的密封不严；阀球密封面设置在活动密封环上,活动密封环活动且可转动地安装在阀球上,当对阀球进行装配,出现阀座密封面与阀球密封面因对位不精导致贴合不严时,可调松并转动活动密封环,调整阀座密封面与阀球密封面实现精确对位,之后再重新固定活动密封环,从而提高装配效率。(The invention provides a movable sealing structure and a ball valve with the same, wherein the movable sealing structure comprises: the valve comprises a valve seat movably mounted on a valve cover and a movable sealing ring movably mounted on a valve ball, wherein the valve seat is provided with a valve seat sealing surface, the movable sealing ring is provided with a valve ball sealing surface, and sealing is realized after the valve seat sealing surface and the valve ball sealing surface are tightly combined. According to the movable sealing structure, the valve seat is movably arranged, so that the pressure reduction between the sealing surface of the valve seat and the sealing surface of the valve ball after the sealing surface is abraded can be compensated flexibly, and the untight sealing after slight abrasion is avoided; the sealing face of the valve ball is arranged on the movable sealing ring, the movable sealing ring is movably and rotatably arranged on the valve ball, when the valve ball is assembled, the sealing face of the valve seat and the sealing face of the valve ball are not accurately attached due to poor alignment, the movable sealing ring can be loosened and rotated, the sealing face of the valve seat and the sealing face of the valve ball are adjusted to realize accurate alignment, and then the movable sealing ring is fixed again, so that the assembly efficiency is improved.)

1. A movable seal structure, comprising:

the valve seat (100) is suitable for being movably arranged on the valve cover (400) and is provided with a valve seat sealing surface (101), and the valve seat sealing surface (101) is an eccentric sealing surface;

the movable sealing ring (200) is suitable for being movably and rotatably arranged on a valve ball (300) and is provided with a valve ball sealing surface (201), and the valve ball sealing surface (201) is an eccentric sealing surface capable of being matched and sealed with the valve seat sealing surface (101);

and after the valve seat sealing surface (101) is tightly attached to the valve ball sealing surface (201), sealing is realized.

2. The movable seal structure according to claim 1, wherein the valve seat (100) includes a cylindrical main body portion (110), an annular portion (120) provided at one end of the cylindrical main body portion (110), and a seal portion (130) located at a connecting position of the cylindrical main body portion (110) and the annular portion (120), the valve seat sealing surface (101) being provided at a position of the seal portion (130) toward a valve ball (300) side; the position that is used for installing valve seat (100) of valve gap (200) is formed with sunken, the outer wall laminating of valve seat (100) sunken inner wall sets up.

3. The movable seal structure of claim 2, wherein: the movable sealing structure further comprises a valve seat fixing structure, the valve seat fixing structure comprises an annular baffle (140) which is provided with a through hole and is suitable for being fixed on a valve cover (200) through a bolt, and a limiting cavity (141) is formed between part of the annular baffle (140) and the valve cover (200);

the periphery of the annular part (120) is provided with an annular protrusion (121), and the annular protrusion (121) extends into the limiting cavity (141) and is limited by the limiting cavity (141).

4. The movable seal structure of claim 3, wherein: the orientation of tube-shape main part (110) valve gap (200) one side is formed with first clearance (111) and second clearance (112), the width in second clearance (112) is greater than first clearance (111), first clearance (111) internally mounted has valve seat sealing washer (150), second clearance (112) internally mounted has the valve seat to press cover (160), the one end laminating of valve seat pressure cover (160) is inserted first clearance (111) is inside towards valve gap (400) direction extrusion valve seat sealing washer (150), valve seat spring (170) are installed to the other end of valve seat pressure cover (160), valve seat pressure cover (160) with being close to of second clearance (112) the lateral wall on one side of first clearance (111) has movable gap (180).

5. The movable seal structure of claim 4, wherein: the valve seat pressing sleeve is characterized by further comprising an annular groove (190) which is arranged on the inner wall of the valve cover (200) on the outer side of the valve seat pressing sleeve (160), a graphite gasket (191) is arranged inside the annular groove (190), and the part, extending out of the annular groove (190), of the graphite gasket (191) is in contact with the outer wall of the cylindrical main body (110) in a fitting mode.

6. The movable seal structure of claim 1, wherein: the movable sealing ring (200) has a fixed state and a rotatable state; when in a fixed state, the movable sealing ring (200) and the valve ball (300) are fixed into a whole; when the movable sealing ring is in a rotatable state, under the action of external force, the movable sealing ring (200) can rotate relative to the valve ball (300), so that the relative position of the valve ball sealing surface (201) and the valve seat sealing surface (101) is changed.

7. The movable seal structure of claim 6, wherein: the movable sealing ring (200) comprises an annular main body (210), a rotating hole (211) is formed in the middle of the annular main body (210), and the annular sealing surface (201) is arranged on the periphery of the annular main body (210); the rotating hole (211) is a through hole.

8. The movable seal structure of claim 7, wherein: the valve ball (300) is provided with:

a first plane (301) formed at one end of the valve ball (1) for sealing;

a first step pillar (302) formed on the first plane (301) and perpendicular to the first plane (301); the first step column (302) is suitable for the rotating hole (211) to be rotatably sleeved, and the height of the first step column (302) is less than or equal to the thickness of the movable sealing ring (200);

and the gland (303) is detachably and fixedly arranged on the valve ball (300) and is used for fixing the movable sealing ring (200) sleeved on the first step column (302).

9. The movable seal structure of claim 8, wherein: be equipped with second plane (304) on first step post (302) top surface, the shaping has second step post (305) on second plane (304), gland (303) cover is established back on second step post (305), through bolt (306) fixed mounting on second plane (304).

10. A ball valve comprising a valve body (600), a valve ball (300) mounted inside the valve body (600) through a valve stem (500), a bonnet (400) mounted on the valve body (600), and a valve seat (100) mounted inside the bonnet (400);

the method is characterized in that: further comprising a movable sealing structure mounted on the valve seat (100) and the valve ball (300), the movable sealing structure being as claimed in any one of claims 1-9.

Technical Field

The invention relates to the technical field of ball valves, in particular to a movable sealing structure and a ball valve with the same.

Background

The ball valve is one of valves widely used, has simple structure, reliable sealing and convenient maintenance, and is widely applied to the fields of petroleum, chemical engineering, metallurgy, light spinning, food, atomic energy, aviation and the like. The ball valve has 90 deg rotation action, and the cock body is one ball with circular through hole or passage in the axis and is used mainly in pipeline to cut off, distribute and change the flow direction of medium and may be closed tightly only through 90 deg rotation and small rotation moment.

The sealing of the conventional ball valve depends on the precise extrusion sealing of the valve seat sealing surface and the ball sealing surface, the requirements on the machining precision and the installation precision of the valve seat sealing surface and the ball sealing surface are very high, once slight deviation occurs in machining or installation, bias voltage is likely to occur, the sealing effect is influenced, and the sealing can be failed in a severe case. The valve seat in the prior art is usually fixedly arranged on the valve cover, and when the ball valve is closed, the spherical surface of the valve ball is in extrusion contact with the valve seat sealing surface of the valve seat to realize sealing; the requirement on the installation accuracy of the valve seat is high, multiple fine adjustment processes are usually involved, even if the installation accuracy is achieved at the beginning, bias abrasion can occur after a certain period of time of subsequent use, the sealing pressure between the sealing surface of the valve seat and the spherical surface is uneven, the sealing strength is further reduced, and serious sealing failure can even be caused. In addition, in the ball valve in the prior art, the valve seat sealing surface and the ball body sealing surface are fixedly arranged, so that the ball valve needs to be integrally replaced once the sealing failure is caused by abrasion and the like, and the cost is high.

Chinese patent document CN108980400B discloses an eccentric ball valve, in which a valve seat is installed on a valve cover in a micro-movable manner by an adjustable installation structure, and a gap is formed between the outer circumferential surface of the valve seat and the valve cover; under the drive of the operating mechanism, when the valve ball rotates to enable the valve ball sealing surface to be gradually in extrusion contact with the valve seat sealing surface, the valve seat can make micro movement along the circumferential direction of the valve ball sealing surface, so that the valve ball sealing surface and the valve seat sealing surface are automatically adjusted and centered, and uniform pressure sealing is further realized. The technical solutions in the above patent documents can solve the problem of fine mounting deviation, but have high requirements for production accuracy.

Therefore, how to design a novel ball valve which can solve the technical problem that the installation process needs to be finely adjusted for many times and can reduce the replacement cost of the valve is an unsolved technical problem in the prior art.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the technical defects that although the ball valve in the prior art can solve the problem that fine deviation is easy to occur during installation, multiple times of adjustment are not needed, the requirement on production precision is high, and once the sealing failure is caused by abrasion of a valve seat sealing surface, the ball valve needs to be integrally replaced, so that the replacement cost is high, thereby providing a movable sealing structure applied to the ball valve.

The invention also provides a ball valve with the movable sealing structure.

To this end, the present invention provides a movable sealing structure comprising:

the valve seat is suitable for being movably arranged on the valve cover and is provided with a valve seat sealing surface, and the valve seat sealing surface is an eccentric sealing surface;

the movable sealing ring is suitable for being movably and rotatably arranged on the valve ball and is provided with a valve ball sealing surface, and the valve ball sealing surface is an eccentric sealing surface which can be matched and sealed with the valve seat sealing surface;

and after the valve seat sealing surface is tightly attached to the valve ball sealing surface, sealing is realized.

Preferably, the valve seat comprises a cylindrical main body part, an annular part arranged at one end of the cylindrical main body part, and a sealing part positioned at the connecting position of the cylindrical main body part and the annular part, and the valve seat sealing surface is arranged at the position of one side of the sealing part facing the valve ball; the valve cover is used for installing the position of the valve seat to form a recess, and the outer wall of the valve seat is attached to the inner wall of the recess.

As a preferable scheme, the movable sealing structure further comprises a valve seat fixing structure, the valve seat fixing structure comprises an annular baffle plate, the annular baffle plate is provided with a through hole and is suitable for being fixed on a valve cover through a bolt, and a limiting cavity is formed between part of the annular baffle plate and the valve cover;

the periphery of the annular part is provided with an annular bulge, and the annular bulge extends into the limiting cavity and is limited by the limiting cavity.

As a preferred scheme, the orientation of tube-shape main part valve gap one side is formed with first clearance and second clearance, the width in second clearance is greater than first clearance, first clearance internally mounted has the valve seat sealing washer, second clearance internally mounted has the valve seat to press the cover, the laminating of the one end of valve seat pressure cover is inserted first clearance is inside towards the extrusion of valve gap direction the valve seat sealing washer, the valve seat spring is installed to the other end that the cover was pressed to the valve seat, the valve seat press the cover with being close to of second clearance the lateral wall on one side of first clearance has the clearance of moving.

As a preferred scheme, still include the ring channel, set up be located the valve gap inner wall in the disk seat pressure cover outside, the inside graphite gasket that is equipped with of ring channel, the part that stretches out of graphite gasket the ring channel with the laminating of the outer wall of tube-shape main part contacts.

Preferably, the movable sealing ring has a fixed state and a rotatable state; when the movable sealing ring is in a fixed state, the movable sealing ring and the valve ball are fixed into a whole; when the movable sealing ring is in a rotatable state, under the action of external force, the movable sealing ring can rotate relative to the valve ball, so that the relative position of the sealing surface of the valve ball and the sealing surface of the valve seat is changed.

As a preferable scheme, the movable sealing ring comprises an annular main body, a rotating hole is formed in the middle of the annular main body, and the annular sealing surface is formed on the periphery of the annular main body; the rotating hole is a through hole.

As a preferable scheme, the valve ball is provided with:

a first plane formed at one end of the valve ball (1) for sealing;

the first step column is formed on the first plane and is perpendicular to the first plane; the first step column is suitable for the rotary hole to be rotatably sleeved, and the height of the first step column is less than or equal to the thickness of the movable sealing ring;

and the gland is detachably and fixedly arranged on the valve ball and is used for fixing the movable sealing ring sleeved on the first step column.

As a preferred scheme, a second plane is arranged on the top surface of the first step column, a second step column is formed on the second plane, and the pressing cover is fixedly installed on the second plane through bolts after being sleeved on the second step column.

The invention also provides a ball valve which comprises a valve body, a valve ball arranged in the valve body through a valve rod, a valve cover arranged on the valve body and a valve seat arranged on the inner side of the valve cover;

the valve also comprises a movable sealing structure arranged on the valve seat and the valve ball, wherein the movable sealing structure is any one of the movable sealing structures.

The technical scheme provided by the invention has the following advantages:

1. the movable sealing structure comprises a valve seat movably arranged on a valve cover and a movable sealing ring movably arranged on a valve ball, wherein the valve seat is provided with a valve seat sealing surface, the movable sealing ring is provided with a valve ball sealing surface, and sealing is realized after the valve seat sealing surface is tightly combined with the valve ball sealing surface. According to the movable sealing structure, the valve seat is movably arranged, so that the pressure between the sealing surface of the valve seat and the sealing surface of the valve ball can be flexibly reduced after the sealing surface is abraded, and the untight sealing after slight abrasion is avoided; secondly, when the sealing surface of the valve seat is worn and needs to be replaced, only the valve seat with smaller volume needs to be replaced, and the replacement cost of the equipment is low; the sealing face of the valve ball is arranged on the movable sealing ring, the movable sealing ring is movably and rotatably arranged on the valve ball, when the valve ball is assembled, the valve seat sealing face and the valve ball sealing face can be loosened due to poor fit caused by poor alignment, the movable sealing ring can be adjusted, the valve seat sealing face and the valve ball sealing face can be adjusted quickly to realize accurate alignment by rotating the movable sealing ring, and the movable sealing ring is fixed again after the adjustment is finished, so that the assembly efficiency can be greatly improved.

2. According to the movable sealing structure, the position of the valve cover for mounting the valve seat is provided with the recess, and the outer wall of the valve seat is attached to the inner wall of the recess, so that the valve seat can only move along the direction of the medium flow direction and cannot move radially.

3. The movable sealing structure also comprises a valve seat fixing structure, wherein the valve seat fixing structure comprises an annular baffle plate, the annular baffle plate is fixed on the valve cover through a bolt, and a limiting cavity is formed between part of the annular baffle plate and the valve cover; be equipped with annular bulge on the periphery of annular portion, annular bulge stretches into to spacing intracavity portion by spacing chamber spacing for the disk seat can only make certain degree's concertina movement along medium flow direction.

4. According to the movable sealing structure, the first gap and the second gap are formed on the side, facing the valve cover, of the cylindrical main body, the trapezoidal valve seat sealing ring is installed inside the first gap, the valve seat pressing sleeve is installed inside the second gap, one end of the valve seat pressing sleeve is inserted into the first gap in a fitting mode to press the valve seat sealing ring towards the valve cover, the valve seat spring is installed at the other end of the valve seat pressing sleeve and used for driving the valve seat to move towards the valve ball by driving the valve seat pressing sleeve, so that the valve seat sealing surface and the valve ball sealing surface are pressed tightly, and even if the sealing surface is slightly worn, the valve seat sealing surface and the valve ball sealing surface can still achieve pressing sealing under the pressure action of the spring.

5. The movable sealing structure also comprises an annular groove, wherein a graphite gasket is arranged in the annular groove, and the part of the graphite gasket extending out of the annular groove is in contact with the outer wall of the cylindrical main body in a fitting manner, so that sealing is realized, and a medium is prevented from entering the valve seat pressing sleeve.

6. According to the movable sealing structure, when the movable sealing ring is in a fixed state, the movable sealing ring and the valve ball are fixed into a whole, and the movable sealing ring rotates along with the valve ball to realize opening or cutting off of a flow passage; when the movable sealing ring is in a rotatable state, the valve ball sealing surface can rotate relative to the valve seat sealing surface under the action of external force; when the valve seat sealing surface and the valve ball sealing surface can not be in close contact to realize sealing during assembly, the movable sealing ring can be loosened to a rotatable state and gradually rotated until the valve ball sealing surface and the valve seat sealing surface are in close contact to seal, and then the movable sealing ring is fixed on the valve ball, so that the precise assembly of the valve ball can be realized. The movable sealing structure can solve the technical problem that fine deviation is easy to occur during installation and multiple times of fine adjustment are needed.

7. The movable sealing structure comprises an annular main body, wherein a rotating hole is formed in the middle of the annular main body, and a valve ball sealing surface is arranged on the periphery of the annular main body; the movable sealing ring is arranged on the valve ball through the rotating hole, and when the movable sealing ring needs to be adjusted, the movable sealing ring rotates through the position of the rotating hole.

8. According to the movable sealing structure, the valve ball is provided with the first plane and the first step column, the movable sealing ring is sleeved on the first step column and is fixedly arranged on the valve ball by using the gland, and the movable sealing ring sleeved on the first step column is extruded and fixed.

9. According to the movable sealing structure, the second plane is arranged on the top surface of the first stepped column, the second stepped column is formed on the second plane, and the gland bush is arranged on the second plane through bolt regulation after being sleeved on the second stepped column; the second step column and the second plane are designed to facilitate fixation of the gland more conveniently.

10. The invention also provides a ball valve, which comprises a valve body, a valve rod, a valve ball, a valve seat, a valve cover and the like, and also comprises a movable sealing structure which is arranged between the valve seat and the valve ball, wherein the movable sealing structure is the movable sealing structure.

Drawings

To more clearly illustrate the technical solutions in the prior art or the embodiments of the present invention, the drawings used in the description of the prior art or the embodiments are briefly introduced below.

Fig. 1 is a schematic view of the overall structure of the valve ball of the present invention.

Fig. 2 is an enlarged schematic view of a portion a of fig. 1.

Reference numerals: 100. a valve seat; 101. a valve seat sealing surface; 110. a cylindrical main body portion; 111. a first gap; 112. a second gap; 113. a first chamfer structure; 120. an annular portion; 121. an annular projection; 130. a sealing part; 140. an annular baffle; 141. a limiting cavity; 150. a valve seat sealing ring; 160. pressing the valve seat; 170. a valve seat spring; 180. a clearance for movement; 190. an annular groove; 191. a graphite gasket; 200. a movable sealing ring; 201. a valve ball sealing surface; 210. an annular body; 211. rotating the hole; 300. a valve ball; 301. a first plane; 302. a first step column; 303. a gland; 304. a second plane; 305. a second step post; 306. a bolt; 400. a valve cover; 401. an end face; 402. a second chamfer structure; 500. a valve stem; 600. a valve body.

Detailed Description

The technical solution of the present invention is described in detail below with reference to the accompanying drawings.