Top entry cryogenic ball valve

Abstract

The utility model discloses a top -mounted low temperature ball valve, the utility model relates to top -mounted ball valve technical field, including the valve body, and both sides of valve body are through a set of first bolt fixed connection with a pair of pipe body, and the annular groove is seted up on the inner top wall of valve body, and the first support block is connected in the annular groove, and the circular rod is slidably connected with the sliding hole in the valve body bottom, and one end of the circular rod in the valve body is fixedly connected with the second support block, and the valve body bottom is provided with the position locking assembly for fixing circular rod, and the ball is seted up between first support block and second support block, and the flow channel is seted up on the ball, and the rotating assembly for driving the ball rotation is seted up on the valve body top, and the sealing assembly for sealing is seted up on the pipe body, and the utility model's advantage lies in: can solve under the low temperature environment, and the ball is easily locked under the influence of low temperature, leads to unable drive valve rod, and when the force is too big, and the phenomenon of easily causing the valve rod fracture.

Description

Technical Field

[0001] This utility model relates to the field of top-mounted ball valve technology, specifically a top-mounted cryogenic ball valve. Background Technology

[0002] With the rapid development of the petroleum, chemical, and gas industries, especially the widespread application of liquefied natural gas (LNG) as a new energy source, the demand for cryogenic valves for LNG is increasing. In accordance with the national energy strategy, my country will actively participate in the development of the global oil and gas market. Because LNG has a temperature of -162℃ at atmospheric pressure and is flammable and explosive, higher requirements are placed on the sealing performance of LNG cryogenic valves during design.

[0003] The applicant discovered through a search that a Chinese patent, "A Top-Mounted Cryogenic Ball Valve," with publication number "CN202756656U," primarily uses a flanged structure on the valve seat ring to fix the sealing ring, and seals the valve seat and valve body through an annular sealing cavity and a spring energy storage ring. Simultaneously, a fireproof structure is installed between the valve body and the valve seat ring to ensure the sealing performance of the valve seat and valve ball under cryogenic conditions. The joint between the valve seat ring and the valve body provides reliable sealing and fireproof safety for the valve. While the above technical solution can achieve the relevant beneficial effects through the existing structure, it still has the following drawbacks: in low-temperature environments, the ball is easily locked due to the low temperature, making it impossible to drive the valve stem. Excessive force can easily cause the valve stem to break. Therefore, we propose a quick-connect structure for the pressure regulating device of a hemodialysis machine. Utility Model Content

[0004] The purpose of this utility model is to provide a top-mounted cryogenic ball valve.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a top-mounted cryogenic ball valve, comprising a valve body, a pair of tubes fixed to both sides of the valve body by a set of first bolts, an annular groove being formed on the top wall of the valve body, a first support block being slidably connected in the annular groove, a circular rod being slidably connected to the bottom of the valve body through a sliding hole, a second support block being fixed to one end of the circular rod located inside the valve body, a locking assembly for fixing the position of the circular rod being provided at the bottom of the valve body, a ball being provided between the first support block and the second support block, a flow channel being formed on the ball, a rotating assembly for driving the ball to rotate being provided at the top of the valve body, and a sealing assembly for sealing being provided on the tubes.

[0006] As a further embodiment of this utility model: the rotating assembly includes a spline groove opened on the top of the sphere, a rectangular spline is connected to the sliding sleeve in the spline groove, a valve stem is fixedly connected to the top of the rectangular spline, and the top of the valve stem passes through the first support block and the top of the valve body, and is connected to the first support block and the valve body sliding sleeve, and a valve is fixedly connected to the top of the valve stem by a second bolt.

[0007] As a further embodiment of this utility model: the locking assembly includes a circular piece fixed to the bottom of a circular rod, the circular piece having a set of through holes, a set of circular blocks fixed to the bottom of the valve body, the bottom of the circular blocks having a second threaded groove, a third bolt in the second threaded groove, and the third bolt passing through the through holes.

[0008] As a further embodiment of this utility model: the sealing assembly includes a set of circular grooves opened at one end of the tube body near the valve body, a sliding rod is slidably connected in the circular grooves, and a sealing ring is fixedly connected to one end of the set of sliding rods.

[0009] As a further embodiment of this utility model: a spring is connected to the inner sleeve of the circular groove, and the spring is located between the bottom of the circular groove and the sliding rod.

[0010] As a further embodiment of this utility model: the bottom of the first support block is provided with an annular groove, the top of the sphere is provided with a set of semi-circular grooves, a ball bearing is placed in the semi-circular grooves, and the set of ball bearings is movably connected in the annular groove.

[0011] As a further embodiment of this utility model: a rotating groove is provided on the top of the second support block, and a bottom support block is placed in the rotating groove.

[0012] Compared with the prior art, the beneficial effects of this utility model by adopting the above technical solution are as follows: 1. This utility model transforms sliding friction into rolling friction through the ball bearing design between the first support block and the ball. Furthermore, the bottom support block placed in the rotating groove at the top of the first support block rotates with the ball, thus reducing the rotational resistance at low temperatures. Operators can easily open and close the valve without increasing the torque, avoiding the problem of traditional ball valves getting stuck at low temperatures. 2. This utility model utilizes the flexible structure of the spring and sealing ring. The elastic compensation of the spring can absorb the thermal contraction deformation of the sealing ring, ball, and tube at low temperatures. Combined with the precise support of the ball and the bottom support block, the sealing ring can achieve the flexible compensation of the spring, thus preventing gaps from forming between the sealing ring and the ball due to thermal contraction at low temperatures.

[0013] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present utility model; Figure 2 This is a cross-sectional view of the valve body in an embodiment of this utility model; Figure 3 This is a schematic diagram of a rectangular spline in an embodiment of this utility model; Figure 4 This is a schematic diagram of the bottom support block in an embodiment of the present invention; Figure 5 This is a schematic diagram of the sphere in an embodiment of the present invention; Figure 6 This is a schematic diagram of the second bolt in an embodiment of this utility model.

[0015] In the diagram: 1. Valve body; 2. Pipe body; 3. Annular groove; 4. First support block; 5. Circular rod; 6. Second support block; 7. Ball; 8. Flow channel; 9. Spline groove; 10. Rectangular spline; 11. Valve stem; 12. Valve; 13. Circular plate; 14. Through hole; 15. Circular block; 16. Second threaded groove; 17. Third bolt; 18. Circular groove; 19. Sliding rod; 20. Sealing ring; 21. Spring; 22. Annular groove; 23. Semicircular groove; 24. Ball; 25. Rotating groove; 26. Bottom support block. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that the description of these embodiments is for the purpose of helping to understand this utility model, but does not constitute a limitation on this utility model.

[0017] Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0018] Please see the appendix Figure 1 -Appendix Figure 6This utility model discloses a top-mounted cryogenic ball valve, comprising a valve body 1, with a pair of tubes 2 fixed to both sides of the valve body 1 by a set of first bolts. An annular groove 3 is provided on the inner top wall of the valve body 1, and a first support block 4 is slidably connected in the annular groove 3. A circular rod 5 is slidably connected to the bottom of the valve body 1 through a sliding hole. A second support block 6 is fixed to one end of the circular rod 5 located inside the valve body 1. A locking assembly for fixing the position of the circular rod 5 is provided at the bottom of the valve body 1. A ball 7 is provided between the first support block 4 and the second support block 6. A flow channel 8 is provided on the ball 7. A rotating assembly for driving the ball 7 to rotate is provided at the top of the valve body 1. A sealing assembly for sealing is provided on the tubes 2.

[0019] In Embodiment 1, the rotating assembly includes a spline groove 9 on the top of the ball 7, a rectangular spline 10 connected to the spline groove 9, a valve stem 11 fixed to the top of the rectangular spline 10, and the top of the valve stem 11 passes through the first support block 4 and the top of the valve body 1, and is connected to the first support block 4 and the valve body 1 via a sliding sleeve. A valve 12 is fixed to the top of the valve stem 11 by a second bolt. The locking assembly includes a circular plate 13 fixed to the bottom of the circular rod 5, a set of through holes 14 on the circular plate 13, a set of circular blocks 15 fixed to the bottom of the valve body 1, a second threaded groove 16 on the bottom of the circular block 15, a third bolt 17 in the second threaded groove 16, and the third bolt 17 passing through the through hole 14. The sealing assembly includes a set of circular grooves 18 on one end of the tube 2 near the valve body 1, a sliding rod 19 slidably connected in the circular grooves 18, and a sealing ring 20 fixed to one end of the set of sliding rods 19. Specifically, the spline groove 9 is an internal spline structure adapted to the rectangular spline 10. It achieves precise torque transmission through key tooth meshing, while allowing the rectangular spline 10 to slide slightly along the groove axis, adapting to thermal deformation compensation of the valve stem 11 and ball 7 at low temperatures. The rectangular spline 10 is made of high-strength, low-temperature resistant alloy, and the key teeth are hardened to ensure transmission stability and wear resistance in low-temperature environments. A low-temperature grease filling groove is provided at the connection between the valve stem 11 and the sliding sleeve of the first support block 4 and valve body 1 to reduce rotational friction and prevent low-temperature jamming. The circular plate 13 corresponds one-to-one with the circular block 15. The diameter of the through hole 14 is slightly larger than the diameter of the third bolt 17, facilitating fine-tuning during installation. After the third bolt 17 is tightened, the circular plate 13 axially locks the circular rod 5, preventing displacement of the ball 7 under force. The circular block 15 and valve body 1 are integrally formed. The inner wall of the second threaded groove 16 is coated with a low-temperature resistant sealant to prevent leakage of the medium from the thread gap at low temperatures. The circular grooves 18 are evenly distributed around the circumference of the tube body 2. One end of the sliding rod 19 is welded and fixed to the sealing ring 20, and the other end is provided with a limiting boss to prevent it from falling out. The sealing ring 20 is made of modified PTFE material and the end face is polished. Through the guiding cooperation between the sliding rod 19 and the circular grooves 18, it is ensured that the sealing ring 20 is always parallel and in contact with the surface of the ball 7, thus ensuring the sealing effect.

[0020] In embodiment 2, a spring 21 is connected to the inner sleeve of the circular groove 18. The spring 21 is located between the bottom of the circular groove 18 and the sliding rod 19. The bottom of the first support block 4 is provided with an annular groove 22. The top of the ball 7 is provided with a set of semi-circular grooves 23. A ball bearing 24 is placed in the semi-circular grooves 23, and the set of ball bearings 24 is movably connected in the annular groove 22. The top of the second support block 6 is provided with a rotating groove 25, and a bottom support block 26 is placed in the rotating groove 25. Specifically, the spring 21 inside the circular groove 18 is a low-temperature compression spring 21. Under natural conditions, it pushes the sliding rod 19 to keep the sealing ring 20 in close contact with the ball 7. At low temperatures, the elastic deformation compensates for the thermal contraction gap between the sealing ring 20 and the ball 7, preventing leakage. The annular groove 22 and the semi-circular groove 23 are size-matched. The ball 24 is made of silicon nitride ceramic material to reduce the frictional resistance of the ball 7 rotation at low temperatures. At the same time, the annular groove 22 limits the ball 24 to ensure the coaxiality of the ball 7 rotation. The rotating groove 25 is an arc-shaped groove that matches the bottom support block 26. The bottom support block 26 is made of self-lubricating wear-resistant material and fits against the bottom of the ball 7 to form a three-point support, which counteracts the radial force of the fluid pressure on the ball 7 and ensures the smooth rotation of the ball 7 at low temperatures.

[0021] Working principle: When valve 12 is closed, the flow channel 8 of ball 7 is perpendicular to the fluid channel of pipe 2 at 90°. Under the preload of spring 21, the sealing ring 20 of the sealing assembly tightly adheres to both sides of the ball 7, blocking fluid flow. At this time, the third bolt 17 of the locking assembly passes through the through hole 14 of the circular piece 13 and is threadedly connected to the circular block 15 at the bottom of the valve body 1, fixing the position of the circular rod 5. Then, the ball 7 is stably limited between the second support block 6 and the first support block 4 through the first support block 4. The operator rotates the valve 12 at the top of the valve stem 11, and the valve 12 drives the valve stem 11 to rotate through the second bolt. Since the rectangular spline 10 at the bottom of the valve stem 11 and the spline groove 9 at the top of the ball 7 are fitted together, the rotational torque is directly transmitted to the ball 7 through the spline transmission. When the body 7 starts to rotate under the action of torque, the annular groove 22 at the bottom of the first support block 4 and the ball 24 in the semi-circular groove 23 at the top of the ball 7 undergo rolling friction, converting the sliding friction of the ball 7 into rolling friction and reducing rotational resistance. At the same time, the bottom support block 26 at the top of the second support block 6 provides bottom support for the ball 7, preventing the ball 7 from deforming due to low temperature or shifting due to fluid pressure. After the ball 7 rotates 90°, the flow channel 8 of the ball 7 is completely aligned with the fluid channels of the two side tubes 2, and the fluid flows smoothly through the flow channel 8. During this process, the sealing ring 20 is always in contact with the surface of the ball 7 under the action of the spring 21, which not only ensures dynamic sealing during flow, but also prevents the sealing ring 20 and the ball 7 from having gaps due to thermal contraction at low temperature due to the flexible compensation effect of the spring 21.

[0022] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1Based on.

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0024] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments.

[0025] For those skilled in the art, various changes, modifications, substitutions, and alterations to these embodiments without departing from the principles and spirit of this utility model will still fall within the protection scope of this utility model.

Claims

1. A top-mounted cryogenic ball valve, comprising a valve body (1), characterized in that: A pair of tubes (2) are fixed to both sides of the valve body (1) by a set of first bolts. An annular groove (3) is provided on the inner top wall of the valve body (1). A first support block (4) is slidably connected in the annular groove (3). A circular rod (5) is slidably connected to the bottom of the valve body (1) through a sliding hole. A second support block (6) is fixed to one end of the circular rod (5) inside the valve body (1). A locking assembly for fixing the position of the circular rod (5) is provided at the bottom of the valve body (1). A ball (7) is provided between the first support block (4) and the second support block (6). A flow channel (8) is provided on the ball (7). A rotating assembly for driving the ball (7) to rotate is provided at the top of the valve body (1). A sealing assembly for sealing is provided on the tube (2).

2. The top-mounted cryogenic ball valve according to claim 1, characterized in that: The rotating assembly includes a spline groove (9) on the top of a ball (7), a rectangular spline (10) is connected to the inner sleeve of the spline groove (9), a valve stem (11) is fixed to the top of the rectangular spline (10), and the top of the valve stem (11) passes through the first support block (4) and the top of the valve body (1), and is connected to the first support block (4) and the valve body (1) through the inner sleeve. A valve (12) is fixed to the top of the valve stem (11) by a second bolt.

3. A top-mounted cryogenic ball valve according to claim 1, characterized in that: The locking assembly includes a circular plate (13) fixed to the bottom of a circular rod (5), a set of through holes (14) on the circular plate (13), a set of circular blocks (15) fixed to the bottom of the valve body (1), a second threaded groove (16) on the bottom of the circular block (15), a third bolt (17) in the second threaded groove (16), and the third bolt (17) passing through the through hole (14).

4. A top-mounted cryogenic ball valve according to claim 1, characterized in that: The sealing assembly includes a set of circular grooves (18) opened at one end of the tube body (2) near the valve body (1), a sliding rod (19) is slidably connected in the circular grooves (18), and a sealing ring (20) is fixedly connected to one end of the set of sliding rods (19).

5. A top-mounted cryogenic ball valve according to claim 4, characterized in that: A spring (21) is connected to the inner sleeve of the circular groove (18), and the spring (21) is located between the bottom of the circular groove (18) and the sliding rod (19).

6. A top-mounted cryogenic ball valve according to claim 1, characterized in that: The first support block (4) has an annular groove (22) at the bottom, and the sphere (7) has a set of semicircular grooves (23) at the top. Balls (24) are placed in the semicircular grooves (23), and a set of balls (24) can be movably connected in the annular grooves (22).

7. A top-mounted cryogenic ball valve according to claim 1, characterized in that: The second support block (6) has a rotating groove (25) on its top, and a bottom support block (26) is placed in the rotating groove (25).

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