Upper-mounted horizontal shaft eccentric half ball valve

Abstract

The utility model discloses a top-mounted horizontal shaft eccentric semi-ball valve, which relates to the technical field of semi-ball valves and has the characteristics of top-mounted convenient maintenance, stability of a horizontal shaft structure and accurate and adjustable functions of a sealing surface. The valve shaft is installed on the valve body in the horizontal direction and fixedly connected with the hemispheroid, a top opening communicated with the flow channel is formed in the top of the valve body, and a top cover is detachably installed at the top opening in a covering mode. A spherical crown ring, a sealing ring and an adjusting mechanism for adjusting the position of the sealing ring are arranged on the hemisphere, and the spherical crown ring is fixedly mounted on the hemisphere; the back hole is formed from the back face of the hemisphere and penetrates to the back face of the sealing ring, and the first stud is screwed in from the back hole and abuts against the back face of the sealing ring. The valve shaft is installed on the valve body in the horizontal direction, the height of the valve body can be effectively reduced, and occupation of the hemispheroid on the lower end space of the runner is reduced. The valve does not need to be integrally detached from a pipeline, internal parts can be maintained by directly opening the top cover, the operation process is simplified, and the position of the sealing ring can be conveniently and online preset.

Description

Technical Field

[0001] The utility model relates to the technical field of semi-spherical valves, in particular to an upper-mounted horizontal-axis eccentric semi-spherical valve. Background Art

[0002] Nowadays, semi-spherical valves are widely used in the field of industrial pipeline fluid control, and among them, semi-spherical valves with side-mounted and vertical valve shaft structures are the most common. Such valves expose significant drawbacks during actual operation: the side-mounted structure causes the core components of the valve, such as seals and valve shafts, to be disassembled from the pipeline as a whole during maintenance, with a complex operation process, consuming a large amount of manpower and material resources, and greatly extending the shutdown time of the pipeline system, affecting production continuity; in the vertical valve shaft installation method, the vertical installation of the valve shaft increases the height of the valve body, and moreover, the semi-spherical body occupies the space at the lower end of the flow channel, hindering the flow of the medium.

[0003] At the same time, the semi-spherical body seal ring and the valve seat seal ring of traditional side-mounted vertical semi-spherical valves lack a flexible and effective pre-adjustment structure. After long-term use, wear of the seals is inevitable, and it is difficult for existing valves to conveniently and accurately adjust their positions. There is a lack of an on-line adjustable compensation mechanism, making it impossible to promptly restore the sealing performance after seal failure, and it is difficult to meet the usage requirements of high-frequency and high-precision fluid control. Summary of the Utility Model

[0004] The purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides an upper-mounted horizontal-axis eccentric semi-spherical valve, which has the characteristics of convenient maintenance of the upper-mounted type, the structural stability of the horizontal shaft, and the function of precise adjustment of the sealing surface.

[0005] The technical solution of the utility model: It includes a valve body, a valve shaft, a semi-spherical body, and a valve seat. The valve body has a flow channel for the medium to flow through. The valve seat is installed on one side of the outlet position of the flow channel. The outlet position of the flow channel has a flange surface. The valve shaft is installed horizontally on the valve body and is fixedly connected to the semi-spherical body. The top of the valve body is provided with a top opening communicating with the flow channel, and a top cover is detachably covered and installed at the top opening; a spherical crown ring, a seal ring, and an adjusting mechanism for adjusting the position of the seal ring are arranged on the semi-spherical body. The spherical crown ring is fixedly installed on the semi-spherical body. The seal ring is located between the spherical crown ring and the semi-spherical body. The front surface of the seal ring faces the spherical crown ring, the back surface faces the semi-spherical body, and the outer edge of the seal ring is in contact with the valve seat to form a sealing fit. A reserved space is provided between the front surface and the corresponding surface of the spherical crown ring and between the back surface and the corresponding surface of the semi-spherical body of the seal ring; the adjusting mechanism includes a first stud and a back hole opened on the semi-spherical body. The back hole is opened from the back surface of the semi-spherical body and penetrates through to the back surface of the seal ring. The first stud is screwed into the back hole and abuts against the back surface of the seal ring.

[0006] With the above technical solution, the valve shaft is installed on the valve body in the horizontal direction. Compared with the traditional vertical valve shaft installation method, it can effectively reduce the height of the valve body, reduce the occupation of the space at the lower end of the runner by the hemispherical body, and make the medium flow more smoothly; the top-mounted structure with a top opening provided at the top of the valve body and a detachable top cover can directly open the top cover to maintain the internal components without removing the valve from the pipeline as a whole during maintenance, seal replacement and other operations, which simplifies the operation process, shortens the shutdown time of the pipeline system, and reduces the labor and material costs; and by setting the adjustment mechanism and the position of the top opening, the first stud is screwed into the back hole to abut against the back of the sealing ring, so that the position of the sealing ring can be conveniently pre-adjusted online to accurately compensate for the decline in sealing performance caused by wear, meeting the use requirements of high-frequency and high-precision fluid control.

[0007] In a possible design, the adjustment mechanism includes an elastic member installed in the spherical crown ring, and both ends of the elastic member are elastically pressed against the front of the sealing ring and the spherical crown ring respectively.

[0008] With the above design, during the wear process of the sealing ring, the elastic member can provide an elastic compensation force in real time, adaptively adjust the position of the sealing ring, prevent the sealing ring from floating and disengaging excessively when the valve is in the open state, ensure the installation reliability of the sealing ring, and effectively extend the service life of the sealing surface.

[0009] In a possible design, a guiding rib protrudes from the back of the sealing ring, the guiding rib is perpendicular to the main body part of the sealing ring, a ring groove is opened at the end of the back hole, the guiding rib is movably installed in the ring groove, and the first stud abuts against the guiding rib.

[0010] With the above design, it provides a guiding and positioning function for the adjustment of the sealing ring, so that the sealing ring will not shift during the adjustment process, ensuring the accuracy of the adjustment. At the same time, it enhances the stability of the sealing ring during the working process, and avoids affecting the sealing effect due to the displacement of the sealing ring caused by the impact of the medium flow.

[0011] In a possible design, a rigid ring pad is also installed between the first stud and the guiding rib, and the rigid ring pad is movably installed in the ring groove.

[0012] With the above design, the rigid ring pad can effectively disperse the pressure of the first stud on the guiding rib, prevent the guiding rib from being damaged due to excessive local force, and at the same time, during the adjustment process, it can make the acting force of the first stud be transmitted to the sealing ring more evenly, improving the reliability and stability of the adjustment.

[0013] In a possible design, a convex platform protrudes from the inner wall of the runner of the valve body, a second stud is screwed on the convex platform, the back side of the valve seat abuts tightly against the convex platform, there is a gap between the convex platform and the flange surface, and the second stud is screwed into the convex platform from the gap and abuts against the back side position of the valve seat.

[0014] With the above design, convenient adjustment of the valve seat position can be achieved. When the valve seat seal ring wears out, the valve seat position can be adjusted in time to restore the sealing performance. The interval between the boss and the flange surface provides an operating space for the installation and adjustment of the second stud, making the adjustment of the valve seat position more convenient and fast. Brief Description of the Drawings

[0015] Figure 1 It is a sectional view of the present utility model in the closed state;

[0016] Figure 2 It is a sectional view of another section of the present utility model in the open state;

[0017] Figure 3 For the present utility model Figure 1 Local enlarged view at A in;

[0018] Among them, 1, valve body; 11, flow channel; 12, flange surface; 13, top opening; 14, top cover; 15, boss; 2, valve shaft; 3, hemispherical body; 31, spherical crown ring; 32, seal ring; 321, guiding rib; 33, adjusting mechanism; 331, reserved space; 332, first stud; 333, back hole; 334, elastic member; 335, annular groove; 336, rigid annular gasket; 4, valve seat; 41, second stud; 42, interval. Detailed Description of the Preferred Embodiment

[0019] As Figures 1 to 3 shown, an upper-mounted horizontal shaft eccentric semi-spherical valve includes a valve body 1, a valve shaft 2, a hemispherical body 3 and a valve seat 4. A flow channel 11 for the medium to flow is machined inside the valve body 1. A position for installing the valve seat 4 is reserved on one side of the outlet of the flow channel 11 and a flange surface 12 is machined. The flange surface 12 is used for butt-joint fixation with an external pipeline. The valve shaft 2 is installed horizontally on the valve body 1 and fixedly connected to the hemispherical body 3. A top opening 13 communicating with the flow channel 11 is opened at the top of the valve body 1. The top opening 13 is opened at the center of the top of the valve body 1. A detachable top cover 14 is installed at the top opening 13 by means of threading or flange connection, and a sealing gasket is arranged between the top cover 14 and the valve body 1. The valve body 1 adopts a horizontal installation structure. The valve shaft 2 horizontally penetrates the valve body 1 and is perpendicular to the direction of the medium flow channel 11 of the flow channel 11, forming a 90° rotation control structure. A shaft hole is opened at the corresponding position on the side wall of the valve body 1. After the valve shaft 2 horizontally passes through the shaft hole, it is fixedly connected to the hemispherical body 3 by means of welding, key connection, etc.

[0020] This application realizes the direct maintenance of core components such as the seal ring 32 and the valve seat 4 from the top without disassembling the valve body, solves the technical problem that traditional side-mounted valves must disassemble the pipeline, and shortens the maintenance time. The horizontal layout of the valve shaft 2 eliminates the height redundancy of the vertical valve shaft 2, reduces the height of the valve body 1 by at least 30%, and at the same time, when the hemispherical body 3 deflects, it completely avoids the space at the lower end of the flow channel 11, reducing the flow resistance coefficient.

[0021] A spherical crown ring 31, a sealing ring 32 and an adjusting mechanism 33 for adjusting the position of the sealing ring 32 are provided on the hemispherical body 3. The spherical crown ring 31 is fixed on the surface of the hemispherical body 3 by welding or bolts. The sealing ring 32 is located between the spherical crown ring 31 and the hemispherical body 3. The front of the sealing ring 32 faces the spherical crown ring 31, the back faces the hemispherical body 3, and the outer edge of the sealing ring 32 contacts the valve seat 4 to form a sealing fit. A reserved space 331 is provided between the front and back of the sealing ring 32 and the corresponding surfaces of the spherical crown ring 31 and the hemispherical body 3 respectively. The reserved space 331 has a gap of about 0.3 - 0.8 mm, which is equivalent to placing the sealing ring 32 in the reserved space 331 between the spherical crown ring 31 and the hemispherical body 3. The adjusting mechanism 33 includes a first stud 332 and a back hole 333 opened on the hemispherical body 3. The back hole 333 is machined on the back of the hemispherical body 3 according to the design dimensions and penetrates through to the back of the sealing ring 32. After the first stud 332 is screwed into the back hole 333, it can directly abut against the back of the sealing ring 32. By rotating the first stud 332, the position of the sealing ring 32 can be adjusted. In this way, by adjusting the elongation of the first stud 332, the sealing ring 32 is pushed to displace axially to compensate for the wear gap. Even when the valve is in the on-line installation state, by removing the top cover 14 and inserting the tool into the back position of the hemispherical body 3, the first stud 332 can also be adjusted on-line; when the valve is opened and the hemispherical body 3 is lifted close to the top port 13, a person's hand can go around to the back of the hemispherical body 3 and use the tool to adjust the first stud 332.

[0022] The adjusting mechanism 33 includes an elastic member 334 installed in the spherical crown ring 31. A groove for installing the elastic member 334 is machined inside the spherical crown ring 31. The elastic member 334 can be a helical spring, a disc spring, an elastic rubber, etc. The elastic member 334 is installed in the groove so that its two ends are in close contact with the front of the sealing ring 32 and the bottom surface of the groove of the spherical crown ring 31 respectively. The elastic member 334 automatically compresses and stores energy to maintain the continuous contact pressure between the sealing ring 32 and the first stud 332. The reverse elastic force of the elastic member 334 and the thrust of the first stud 332 form a certain dynamic balance to ensure that the sealing ring 32 is closely fitted with the first stud 332 and prevent the sealing ring 32 from frequently jumping off due to the influence of the medium.

[0023] When manufacturing the sealing ring 32, a guiding edge 321 perpendicular to the main body part is formed on the back surface of the sealing ring 32 by means of die injection molding or machining. At the same time, a ring groove 335 adapted to the shape of the guiding edge 321 is machined at the end of the back hole 333 of the hemispherical body 3. When the sealing ring 32 is installed on the hemispherical body 3, the guiding edge 321 is inserted into the ring groove 335, and after the first stud 332 is screwed into the back hole 333, it abuts against the guiding edge 321. When adjusting the position of the sealing ring 32, the guiding edge 321 slides in the ring groove 335 to ensure that the sealing ring 32 moves only in a predetermined direction and avoids deviation. The thrust of the first stud 332 is converted into a uniform surface load through the guiding edge 321, avoiding point contact stress concentration.

[0024] According to the size of the guiding edge 321 and the space of the ring groove 335, a suitable rigid ring gasket 336 is placed and inserted. The rigid ring gasket 336 can be made of metal or hard plastic. The rigid ring gasket 336 is placed in the ring groove 335, between the first stud 332 and the guiding edge 321. When installing the first stud 332, the rigid ring gasket 336 evenly disperses the pressure of the stud onto the guiding edge 321, preventing local stress concentration and damage to the guiding edge 321.

[0025] When machining the inner wall of the flow channel 11 of the valve body 1, the boss 15 structure is directly formed, and a threaded hole is machined on the boss 15. The second stud 41 is screwed into the threaded hole. When installing the valve seat 4, its back side is closely abutted against the boss 15, and a sufficient interval 42 for the second stud 41 to be screwed in for adjustment and the adjustment tool is reserved between the boss 15 and the flange surface 12. When the sealing ring 32 of the valve seat 4 is worn and needs to be adjusted, by rotating the second stud 41, it pushes against the back side of the valve seat 4 to change the position of the valve seat 4, so as to restore the sealing performance of the sealing ring 32 of the valve seat 4. In actual operation, when adjusting the valve seat 4 of this valve online, there are indeed technical difficulties such as a relatively long operation distance and a large space corner; however, this problem can be overcome by customizing special tools. The specially made lengthened adjusting rod or corner wrench can effectively break through the space limitation and achieve precise adjustment. For large-diameter valves, the operator can directly enter the top opening 13 to adjust the valve seat 4 and the sealing ring 32 at close range. Compared with the complex process of disassembling the whole valve from the pipeline for traditional valves, this application has certain advantages in terms of operation convenience, maintenance efficiency, and cost control, improving the feasibility and economy of valve maintenance.

Claims

1. A top-mounted horizontal shaft eccentric hemispherical valve, comprising a valve body (1), a valve shaft (2), a hemispherical body (3) and a valve seat (4), wherein the valve body (1) has a flow channel (11) for medium to flow, the valve seat (4) is mounted on one side of the outlet position of the flow channel (11), and the outlet position of the flow channel (11) has a flange surface (12), characterized in that: The valve shaft (2) is mounted on the valve body (1) in a horizontal direction and is fixedly connected to the hemispherical body (3); a top opening (13) communicating with the flow channel (11) is provided on the top of the valve body (1); a top cover (14) is detachably mounted on the top opening (13); a spherical crown ring (31), a sealing ring (32) and an adjusting mechanism (33) for adjusting the position of the sealing ring (32) are provided on the hemispherical body (3); the spherical crown ring (31) is fixedly mounted on the hemispherical body (3); the sealing ring (32) is located between the spherical crown ring (31) and the hemispherical body (3); the front side of the sealing ring (32) faces the spherical crown ring (31); and the sealing ring (32) is disposed between the spherical crown ring (31) and the hemispherical body (3). 1), the back side faces the hemispherical body (3) and the outer edge of the sealing ring (32) contacts the valve seat (4) to form a sealing fit, and a reserved space (331) is provided between the front side and the back side of the sealing ring (32) and the corresponding surface of the spherical crown ring (31) and the corresponding surface of the hemispherical body (3), respectively; the adjusting mechanism (33) comprises a first stud (332) and a back hole (333) opened on the hemispherical body (3), the back hole (333) is opened from the back side of the hemispherical body (3) and passes through to the back side of the sealing ring (32), and the first stud (332) is screwed into the back hole (333) and abuts against the back side of the sealing ring (32).

2. The top-mounted horizontal shaft eccentric hemispherical valve according to claim 1, characterized in that: The adjustment mechanism (33) comprises an elastic member (334) installed in the spherical crown ring (31), and two ends of the elastic member (334) are elastically pressed against the front surface of the sealing ring (32) and the spherical crown ring (31) respectively.

3. The top-mounted horizontal shaft eccentric hemispherical valve according to claim 1 or 2, characterized in that: A guide ridge (321) is convexly provided on the back side of the sealing ring (32), the guide ridge (321) and the main body of the sealing ring (32) being perpendicular to each other, an annular groove (335) is provided at the end of the back hole (333), the guide ridge (321) is movably mounted in the annular groove (335), and the first stud (332) abuts against the guide ridge (321).

4. The top-mounted horizontal shaft eccentric hemispherical valve according to claim 3 is characterized in that: A hard ring washer (336) is also installed between the first stud (332) and the guide edge (321), and the hard ring washer (336) is movably installed in the ring groove (335).

5. The top-mounted horizontal shaft eccentric hemispherical valve according to claim 1, characterized in that: A boss (15) is provided on the inner wall of the flow channel (11) of the valve body (1), a second stud (41) is screwed onto the boss (15), the back side of the valve seat (4) is closely attached to the boss (15), a gap (42) is provided between the boss (15) and the flange surface (12), the second stud (41) is screwed into the boss (15) from the gap (42) and abuts against the back side of the valve seat (4).

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