Low-temperature deformation coordination compensation top-mounted ball valve

Abstract

The invention relates to the technical field of valve sealing, in particular to a low-temperature deformation coordination compensation top-mounted ball valve which comprises a valve body, a front valve seat assembly, a rear valve seat assembly, a valve rod assembly, a ball body and a floating mechanism, the ball body is arranged in the valve body, and the valve rod assembly is arranged at the top of the valve body; according to the low-temperature deformation coordination compensation top-mounted ball valve, after assembly, the upper valve shaft and the lower valve shaft in the valve body are in butt joint with the top and the bottom of the ball body respectively to form a top-mounted ball valve main body structure, the top-mounted ball valve main body structure is connected with a pipeline in a welded mode, no external leakage exists at the connecting position, and the low-temperature deformation coordination compensation top-mounted ball valve is convenient to use. Meanwhile, all internal parts of the valve are arranged in the valve body, online maintenance can be achieved by opening the valve cover, the valve body does not need to be detached from a pipeline, and the downtime and the maintenance cost are reduced; the top pressing block is elastically supported by the bottom spring, the top spring is matched to enable the ball to be in a floating free state, shrinkage deformation of valve internals at low temperature can be coordinated and compensated, and the low-temperature sealing performance of the valve is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of valve sealing, and more specifically, to a cryogenic deformation coordination compensation top-mounted ball valve. Background Art

[0002] A ball valve is a rotary valve that controls the on / off or flow regulation of a fluid by rotating a sphere. Its core component is a sphere with a through hole. When the sphere rotates 90°, the valve can be fully opened or closed. Due to its characteristics such as fast opening and closing, good sealing performance, and small flow resistance, ball valves are widely used in industries such as petroleum, chemical, power, and water treatment. The existing structure of ball valves can basically meet the daily use requirements. However, during installation, the entire ball valve is embedded in the pipeline, and the entire valve body needs to be disassembled during later maintenance. At the same time, the sphere that controls the opening and closing of the valve is fixedly connected to the valve stem. When using austenitic materials from normal temperature to ultra-low temperature in an environment with extreme temperature changes, as the temperature changes, the internal components of the valve shrink and the dimensions change, resulting in a change in the sealing performance of the valve at low temperatures. The existing structure cannot provide coordinated compensation under the condition of internal component deformation, which affects the sealing performance of the valve under low temperature conditions. Therefore, we propose a cryogenic deformation coordination compensation top-mounted ball valve. Summary of the Invention

[0003] In view of this, the present invention provides a cryogenic deformation coordination compensation top-mounted ball valve, aiming to solve the above technical problems.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A cryogenic deformation coordination compensation top-mounted ball valve, comprising a valve body, a front valve seat assembly, a rear valve seat assembly, a valve stem assembly, a sphere, and a floating mechanism. A front valve seat assembly is provided on one side inside the valve body, a rear valve seat assembly is provided on the other side inside the valve body, a sphere is provided inside the valve body, a valve stem assembly is provided on the top of the valve body, and a floating mechanism is provided between the sphere and the valve stem assembly and the valve body.

[0005] In some embodiments, the front valve seat assembly is composed of a front valve seat, a front spring, a front connecting sleeve, and a front fixing hoop. A front fixing hoop is sleeved on the front valve seat, the front valve seat is sleeved on the front connecting sleeve, both the front connecting sleeve and the front valve seat are sleeved in the valve body, front springs are uniformly arranged between the front valve seat and the front connecting sleeve, and the front springs are sleeved in grooves uniformly opened on one side of the front valve seat.

[0006] In some embodiments, the rear valve seat assembly is composed of a rear valve seat, a rear spring, a rear connecting sleeve and a rear fixing hoop. The rear fixing hoop is sleeved on the rear valve seat. The rear valve seat is sleeved on the rear connecting sleeve. Both the rear connecting sleeve and the rear valve seat are sleeved in the valve body. A rear spring is evenly arranged between the rear valve seat and the rear connecting sleeve. The rear spring is sleeved in a groove evenly formed on one side of the rear valve seat.

[0007] In some embodiments, the valve stem assembly is composed of a first bushing, a valve cover, a first positioning pin, an antifriction gasket, a second bushing, an upper valve shaft, a packing gasket, a packing set, a packing gland, a third bushing, an upper bracket, a second positioning pin, a driving worm gear and a packing pressing plate. The first positioning pin is sleeved in a groove symmetrically formed at the bottom of the valve cover. The bottom end of the first positioning pin is sleeved in a groove formed at the top of the valve body. The valve cover and the valve body are fixed to each other by bolts.

[0008] In some embodiments, the upper valve shaft is sleeved in the valve cover. The bottom of the upper valve shaft is fitted and sleeved in a groove at the top of the sphere. The bottom end of the upper valve shaft is sleeved with a second bushing. An antifriction gasket is attached to the bottom of the second bushing. The antifriction gasket is sleeved on the upper valve shaft. The bottom of the valve cover is sleeved with a first bushing. The first bushing is sleeved on the top of the sphere.

[0009] In some embodiments, a packing gasket, a packing set and a packing gland are sleeved on the inner wall of the top of the valve cover from bottom to top. The packing gasket, the packing set and the packing gland are all sleeved on the upper valve shaft. A third bushing is arranged at the connection between the packing gland and the upper valve shaft. The top of the valve cover is connected with a packing pressing plate by a screw. The packing pressing plate presses tightly on the packing gland. A second positioning pin is sleeved in a groove formed at the top of the valve cover. The top end of the second positioning pin is sleeved in a groove formed at the bottom of the upper bracket. A driving worm gear is fixedly installed at the top of the upper bracket. The driving worm gear is connected with the top of the upper valve shaft by a transmission key.

[0010] In some embodiments, the floating mechanism is composed of a lower valve shaft, a bottom spring, a fourth bushing, a top spring and a top pressing block. The lower valve shaft is rotatably connected to the inner bottom end of the valve body. A fourth bushing is arranged between the lower valve shaft and the sphere. A bottom spring is arranged in a groove formed at the top of the lower valve shaft. The top of the bottom spring is attached to the top pressing block. The top pressing block is slidably connected in the lower valve shaft. The top pressing block presses against the bottom of the valve body. The top spring is arranged in a groove formed at the center of the bottom of the upper valve shaft. The bottom end of the top spring is attached to the top of the valve body.

[0011] Through the above technical solutions, compared with the prior art, the present invention discloses a cryogenic deformation coordination compensation top-mounted ball valve, which has the following beneficial effects: 1. The present invention docks the pipeline structure by the front valve seat assembly and the rear valve seat assembly in the valve body. The valve cover fixed to the top of the valve body supports the upper valve shaft. After assembly, the upper valve shaft and the lower valve shaft in the valve body are respectively docked with the top and bottom of the sphere to form a top-mounted ball valve main structure. The valve is welded to the pipeline, and there is no external leakage at the connection. At the same time, all valve internals are within the valve body. Opening the valve cover enables on-line maintenance without disassembling the valve body from the pipeline, reducing downtime and maintenance costs.

[0012] 2. A bottom spring is arranged in the lower valve shaft of the present invention. The bottom spring is used to elastically support the top pressing block. At the same time, a top spring is arranged at the bottom of the upper valve shaft. The top pressing block with elastic support at the bottom makes the sphere elastically float between the front valve seat assembly and the rear valve seat assembly. After assembly, the sphere is in a floating free state, which can coordinately compensate for the shrinkage deformation of the valve internals at low temperatures and ensure the low-temperature sealing performance of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is an exploded structure schematic diagram of the present invention; Figure 3 It is Figure 2 A partial enlarged view of area A in Figure 4 It is Figure 2 A partial enlarged view of area B in Figure 5 It is a partial structure schematic diagram of Embodiment II of the present invention; Figure 6 It is Figure 5 A partial enlarged view of area C in Figure 7 It is Figure 5 A partial enlarged view of area D in Figure 8 It is a schematic diagram of the opening positions of the front stepped groove and the rear stepped groove of the present invention.

[0015] Wherein: 1 - Valve body; 2 - Front valve seat assembly; 3 - Rear valve seat assembly; 4 - Valve stem assembly; 5 - Sphere; 6 - Floating mechanism; 21 - Front valve seat; 22 - Front spring; 23 - Front connecting sleeve; 24 - Front fixing hoop; 31 - Rear valve seat; 32 - Rear spring; 33 - Rear connecting sleeve; 34 - Rear fixing hoop; 40 - First bushing; 41 - Valve cover; 42 - First positioning pin; 43 - Anti - friction gasket; 44 - Second bushing; 45 - Upper valve shaft; 46 - Packing gasket; 47 - Packing set; 48 - Packing gland; 49 - Third bushing; 50 - Upper bracket; 51 - Second positioning pin; 52 - Driving worm gear; 53 - Packing pressing plate; 61 - Lower valve shaft; 62 - Bottom spring; 63 - Fourth bushing; 64 - Top spring; 65 - Pressing block; 101 - Front pressing ring; 102 - Front sealing ring; 103 - Front stepped groove; 112 - Rear sealing ring; 113 - Rear stepped groove. Detailed implementation mode

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0017] Embodiment 1: Please refer to Figures 1-4 , the present invention provides a technical solution: a cryogenic deformation - coordinated compensation top - mounted ball valve, including a valve body 1, a front valve seat assembly 2, a rear valve seat assembly 3, a valve stem assembly 4, a sphere 5 and a floating mechanism 6. A front valve seat assembly 2 is arranged on one side inside the valve body 1, a rear valve seat assembly 3 is arranged on the other side inside the valve body 1, a sphere 5 is arranged inside the valve body 1, a valve stem assembly 4 is arranged on the top of the valve body 1, and a floating mechanism 6 is arranged between the sphere 5, the valve stem assembly 4 and the valve body 1; the valve stem assembly 4 can drive the sphere 5 to rotate in the valve body 1, and by rotating the valve body 1, the opening and closing state of the ball valve is regulated; The front valve seat assembly 2 is composed of a front valve seat 21, a front spring 22, a front connecting sleeve 23 and a front fixing hoop 24. A front fixing hoop 24 is sleeved on the front valve seat 21, the front valve seat 21 is sleeved on the front connecting sleeve 23, both the front connecting sleeve 23 and the front valve seat 21 are sleeved in the valve body 1. Front springs 22 are evenly arranged between the front valve seat 21 and the front connecting sleeve 23. The front springs 22 are sleeved in the grooves evenly opened on one side of the front valve seat 21. The front valve seat 21 is connected to the front connecting sleeve 23 through the front springs 22. The front connecting sleeve 23 is pressed against one side of the sphere 5 under the elastic force of the front springs 22. In the open state, the front connecting sleeve 23 is pressed against one side of the inner cavity of the sphere 5. In the closed state, the sphere 5 rotates ninety degrees, and at this time, the front connecting sleeve 23 is pressed against the outer wall of the sphere 5, cutting off the communication state of the pipeline; The rear valve seat assembly 3 is composed of a rear valve seat 31, a rear spring 32, a rear connecting sleeve 33, and a rear fixing hoop 34. The rear fixing hoop 34 is sleeved on the rear valve seat 31. The rear valve seat 31 is sleeved on the rear connecting sleeve 33. Both the rear connecting sleeve 33 and the rear valve seat 31 are sleeved in the valve body 1. Rear springs 32 are evenly arranged between the rear valve seat 31 and the rear connecting sleeve 33. The rear springs 32 are sleeved in the grooves evenly opened on one side of the rear valve seat 31. The rear valve seat 31 is connected to the rear connecting sleeve 33 through the rear springs 32. The rear connecting sleeve 33 is pressed against the other side of the sphere 5 under the elastic force of the rear springs 32. In the open state, the rear connecting sleeve 33 is pressed against one side of the inner cavity of the sphere 5. In the closed state, the sphere 5 rotates 90 degrees. At this time, the rear connecting sleeve 33 is pressed against the outer wall of the sphere 5, cutting off the communication state of the pipeline. The valve stem assembly 4 is composed of a first bushing 40, a valve cover 41, a first positioning pin 42, an antifriction gasket 43, a second bushing 44, an upper valve shaft 45, a packing gasket 46, a packing set 47, a packing gland 48, a third bushing 49, an upper bracket 50, a second positioning pin 51, a driving worm gear 52, and a packing pressing plate 53. The first positioning pin 42 is sleeved in the grooves symmetrically opened at the bottom of the valve cover 41. The bottom end of the first positioning pin 42 is sleeved in the groove opened at the top of the valve body 1. The valve cover 41 and the valve body 1 are fixed to each other by bolts. During the assembly process, the upper and lower ends of the first positioning pin 42 are respectively butted against the valve cover 41 and the valve body 1 to limit the installation of the valve cover 41 and assist the smooth progress of the assembly. The upper valve shaft 45 is sleeved in the valve cover 41. The bottom of the upper valve shaft 45 is fitted and sleeved in the groove at the top of the sphere 5. The bottom end of the upper valve shaft 45 is sleeved with a second bushing 44. The bottom of the second bushing 44 is fitted with an antifriction gasket 43. The antifriction gasket 43 is sleeved on the upper valve shaft 45. The bottom of the valve cover 41 is sleeved with a first bushing 40. The first bushing 40 is sleeved on the top of the sphere 5. The first bushing 40 is sleeved between the top of the sphere 5 and the valve cover 41 to ensure that the sphere 5 remains axially centered during rotation and avoid the offset of the sphere 5 caused by the medium pressure or operating torque. The antifriction gasket 43 is located at the bottom end of the upper valve shaft 45. As a sliding bearing material, it significantly reduces the frictional torque during the rotation of the sphere 5 and makes the valve operation easier. At the top of the inner wall of the valve cover 41, a packing gasket 46, a packing set 47, and a packing gland 48 are sleeved from bottom to top. The packing gasket 46, the packing set 47, and the packing gland 48 are all sleeved on the upper valve stem 45. A third bushing 49 is provided at the connection between the packing gland 48 and the upper valve stem 45. The top of the valve cover 41 is connected by a screw to a packing pressing plate 53, and the packing pressing plate 53 presses tightly on the packing gland 48. A second positioning pin 51 is sleeved in a groove opened at the top of the valve cover 41, and the top of the second positioning pin 51 is sleeved in a groove opened at the bottom of the upper support 50. A driving worm gear 52 is fixedly installed at the top of the upper support 50, and the driving worm gear 52 is connected to the top of the upper valve stem 45 by a transmission key; the packing gasket 46 and the packing set 47 are located at the connection between the valve cover 41 and the upper valve stem 45 to form an elastic sealing layer to prevent the liquid, gas, or steam in the pipeline from leaking outward along the valve stem. After the packing pressing plate 53 is fixed, the packing gland 48 is pressed against the packing set 47 to ensure the stability of the structure; The floating mechanism 6 is composed of a lower valve stem 61, a bottom spring 62, a fourth bushing 63, a top spring 64, and a pressing block 65. The lower valve stem 61 is rotatably connected to the inner bottom end of the valve body 1. A fourth bushing 63 is provided between the lower valve stem 61 and the sphere 5. A bottom spring 62 is provided in a groove opened at the top of the lower valve stem 61, and the top of the bottom spring 62 abuts against the pressing block 65. The pressing block 65 is slidably connected in the lower valve stem 61, and the pressing block 65 presses against the bottom of the valve body 1. The top spring 64 is provided in a groove opened at the center of the bottom of the upper valve stem 45, and the bottom end of the top spring 64 abuts against the top of the valve body 1; A bottom spring 62 is provided in the lower valve stem 61, and the bottom spring 62 is used to elastically support the pressing block 65. At the same time, a top spring 64 is provided at the bottom of the upper valve stem 45. The pressing block 65 with elastic support at the bottom enables the sphere 5 to elastically float between the front valve seat assembly 2 and the rear valve seat assembly 3. After assembly, the sphere 5 is in a free floating state and can coordinately compensate for the shrinkage deformation of the valve internals at low temperatures.

[0018] Embodiment 2: Please refer to Figures 1-8, the present invention provides a technical solution: a low-temperature deformation coordination compensation top-mounted ball valve, further comprising a front pressure ring 101, a front sealing ring 102, a front stepped groove 103, a rear sealing ring 112 and a rear stepped groove 113. The front stepped groove 103 and the rear stepped groove 113 are respectively formed on both inner sides of the valve body 1. The front stepped groove 103 and the rear stepped groove 113 are respectively slidably connected to the front valve seat assembly 2 and the rear valve seat assembly 3. The front pressure ring 101 is fixed to the front connecting sleeve 23 in the front valve seat assembly 2 by bolts. The front connecting sleeve 23 is elastically supported on the front valve seat 21 by a front spring 22. The front fixing hoop 24 on the front valve seat 21 presses against the front stepped groove 103 to limit the movement of the front valve seat 21. The front sealing ring 102 is sleeved on the front connecting sleeve 23, and the front sealing ring 102 is located between the front connecting sleeve 23 and the front pressure ring 101. The elastic potential energy accumulated by the front sealing ring 102 tightly presses the inside of the front stepped groove 103 to achieve the seal between the front valve seat assembly 2 and the valve body 1. The rear connecting sleeve 33 is elastically supported on the rear valve seat 31 by a rear spring 32. The rear fixing hoop 34 on the rear valve seat 31 presses against the rear stepped groove 113 to limit the movement of the rear valve seat 31. The rear sealing ring 112 is sleeved on the rear connecting sleeve 33 and tightly presses the inside of the rear stepped groove 113 by the accumulated elastic potential energy to achieve the seal between the rear valve seat assembly 3 and the valve body 1.

[0019] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0020] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0021] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low-temperature deformation coordination compensation top-mounted ball valve, comprising a valve body (1), a front valve seat assembly (2), a rear valve seat assembly (3), a valve stem assembly (4), a ball (5) and a floating mechanism (6), characterized in that: On one side inside the valve body (1), a front valve seat assembly (2) is provided. On the other side inside the valve body (1), a rear valve seat assembly (3) is provided. Inside the valve body (1), a sphere (5) is provided. On the top of the valve body (1), a valve stem assembly (4) is provided. A floating mechanism (6) is provided between the sphere (5), the valve stem assembly (4) and the valve body (1).

2. The top-mounted ball valve with low-temperature deformation coordination compensation according to claim 1, characterized in that: The front valve seat assembly (2) consists of a front valve seat (21), a front spring (22), a front connecting sleeve (23) and a front fixing hoop (24). A front fixing hoop (24) is sleeved on the front valve seat (21). The front valve seat (21) is sleeved on the front connecting sleeve (23). Both the front connecting sleeve (23) and the front valve seat (21) are sleeved in the valve body (1). Front springs (22) are evenly arranged between the front valve seat (21) and the front connecting sleeve (23). The front springs (22) are sleeved in the grooves evenly opened on one side of the front valve seat (21).

3. The top-mounted ball valve with low-temperature deformation coordination compensation according to claim 1, characterized in that: The rear valve seat assembly (3) consists of a rear valve seat (31), a rear spring (32), a rear connecting sleeve (33) and a rear fixing hoop (34). A rear fixing hoop (34) is sleeved on the rear valve seat (31). The rear valve seat (31) is sleeved on the rear connecting sleeve (33). Both the rear connecting sleeve (33) and the rear valve seat (31) are sleeved in the valve body (1). Rear springs (32) are evenly arranged between the rear valve seat (31) and the rear connecting sleeve (33). The rear springs (32) are sleeved in the grooves evenly opened on one side of the rear valve seat (31).

4. The top-mounted ball valve for low-temperature deformation coordination compensation according to claim 1, characterized in that: The valve stem assembly (4) consists of a first bushing (40), a valve cover (41), a first positioning pin (42), an antifriction gasket (43), a second bushing (44), an upper valve shaft (45), a packing gasket (46), a packing set (47), a packing gland (48), a third bushing (49), an upper bracket (50), a second positioning pin (51), a driving worm gear (52) and a packing pressing plate (53). A first positioning pin (42) is sleeved in the symmetrically opened grooves at the bottom of the valve cover (41). The bottom end of the first positioning pin (42) is sleeved in the groove opened at the top of the valve body (1). The valve cover (41) and the valve body (1) are fixed to each other by bolts.

5. The top-mounted ball valve for compensating low-temperature deformation coordination according to claim 4, wherein: The upper valve shaft (45) is sleeved in the valve cover (41). The bottom of the upper valve shaft (45) is fitted and sleeved in the groove at the top of the sphere (5). The bottom end of the upper valve shaft (45) is sleeved with a second bushing (44). An antifriction gasket (43) is attached to the bottom of the second bushing (44). The antifriction gasket (43) is sleeved on the upper valve shaft (45). The bottom of the valve cover (41) is sleeved with a first bushing (40). The first bushing (40) is sleeved on the top of the sphere (5).

6. The top-mounted ball valve with low-temperature deformation coordination compensation according to claim 4, characterized in that: At the top of the inner wall of the valve cover (41), a packing gasket (46), a packing set (47) and a packing gland (48) are sleeved from bottom to top. The packing gasket (46), the packing set (47) and the packing gland (48) are all sleeved on the upper valve shaft (45). A third bushing (49) is provided at the connection between the packing gland (48) and the upper valve shaft (45). The top of the valve cover (41) is connected with a packing pressing plate (53) by a screw. The packing pressing plate (53) presses tightly on the packing gland (48). A second positioning pin (51) is sleeved in a groove opened at the top of the valve cover (41). The top end of the second positioning pin (51) is sleeved in a groove opened at the bottom of the upper support (50). A driving worm gear (52) is fixedly installed at the top of the upper support (50). The driving worm gear (52) is connected with the top of the upper valve shaft (45) through a transmission key.

7. The top-mounted ball valve with low-temperature deformation coordination compensation according to claim 1, characterized in that: The floating mechanism (6) is composed of a lower valve shaft (61), a bottom spring (62), a fourth bushing (63), a top spring (64) and a pressing block (65). The lower valve shaft (61) is rotatably connected to the bottom end inside the valve body (1). A fourth bushing (63) is provided between the lower valve shaft (61) and the sphere (5). A bottom spring (62) is arranged in a groove opened at the top of the lower valve shaft (61). The top of the bottom spring (62) abuts against the pressing block (65). The pressing block (65) is slidably connected in the lower valve shaft (61). The pressing block (65) presses against the bottom of the valve body (1). The top spring (64) is arranged in a groove opened at the center of the bottom of the upper valve shaft (45). The bottom end of the top spring (64) abuts against the top of the valve body (1).

Images