Ultralow temperature high pressure ball valve

Abstract

The application discloses an ultralow-temperature high-pressure ball valve, which comprises a spherical valve, a sealing pair, a valve body, a valve cover and a valve rod, and a temperature insulation transmission part is arranged on the valve rod. The temperature insulation transmission part is arranged on the valve rod to insulate temperature, reduce the transmission of cold energy to the operating handle through the valve rod, and simultaneously play the role of packing seal between the valve rod and the valve cover, so that the temperature insulation transmission part can avoid the influence of cold energy on the packing in the temperature insulation transmission part while avoiding the transmission of cold energy to the operating handle, and further reduce the influence of the transmission of cold energy on the seal between the valve cover and the valve rod. The temperature insulation transmission part has the functions of temperature insulation and transmission, and can rotate the valve rod without affecting the temperature insulation. The length of the valve rod can be effectively shortened through the temperature insulation transmission part, so that the height of the valve cover exposed outside the heat preservation layer is reduced, and the volume of the ultralow-temperature high-pressure ball valve is effectively reduced, and the construction space is effectively increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ultra-low temperature ball valve, more particularly, the present application relates to an ultra-low temperature high-pressure ball valve. BACKGROUND

[0002] With the development of petrochemical industry, especially the wide application of liquefied natural gas (LNG), the requirements for valves used in ultra-low temperature working conditions are also increasing. According to the requirements of relevant engineering design and process operation safety, domestic and foreign valve suppliers have been researching on the structure design of ultra-low temperature ball valves in different positions and making corresponding improvements on the structure design. The definition of low temperature valve in petrochemical industry is defined according to the design temperature of the transported medium. Generally, the valve applied in medium temperature below-40℃ is called low temperature valve, and the valve applied in medium temperature below-101℃ is called ultra-low temperature valve. The ultra-low temperature ball valve is mainly applied in liquefied natural gas, liquefied petroleum gas and air separation industry. The output of liquid low temperature medium is: liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc. These media are not only flammable and explosive, but also will vaporize when heated or flashed, and the volume will expand sharply when vaporized. If the valve cavity of the valve conveying these fluids is closed and the structure design is unreasonable, it will cause overpressure in the valve cavity, resulting in medium leakage, even valve cracking and accidents. Therefore, the current mainstream research and development direction is how to avoid overpressure in the valve cavity, and few people pay attention to how to reduce the temperature transfer direction.

[0003] The valve cover of the low temperature valve is designed with a lengthened valve cover. The design of the lengthened valve cover is to make the valve handle and the packing installation position away from the low temperature area, which can avoid the low temperature of the medium causing cold burn of the valve operator, and can also make the packing work at normal temperature to ensure that the packing will not be damaged by frost to cause packing fracture failure. In addition, since the cold insulation layer of the general ultra-low temperature valve is relatively thick, the lengthened valve cover also ensures the space for cold insulation construction, and makes the packing gland located outside the cold insulation layer. When adding the packing and tightening the gland bolt, the cold insulation layer does not need to be damaged. Some manufacturers use a drip plate design on the lengthened valve cover of the ultra-low temperature ball valve. The drip plate is arranged outside the cold insulation layer, which can prevent the condensed water from falling on the cold insulation layer and the upper part of the valve body, and protect the cold insulation layer and prevent the loss of cold energy. For example, the prior application patent 201220513078.X has disclosed the specific structure of the ultra-low temperature ball valve, which adopts the lengthened valve cover design and the drip plate design to reduce the transmission of low temperature and the influence of condensed water through the drip plate. However, the structure design of the valve and the stem direct connection depends on the material properties of the valve stem itself. The direct connection with the ball valve is not obvious in reducing the effect of cold energy transmission. In order to achieve sufficient temperature change, the valve stem needs to have a very long length, so the ultra-low temperature ball valve occupies a large space. Therefore, how to reduce the transmission of cold energy without increasing the length of the valve stem, so as to minimize the size of the ultra-low temperature high pressure ball valve without affecting the packing and causing frostbite to the workers, is a technical problem to be solved by the present application. Therefore, it is necessary to propose an ultra-low temperature high pressure ball valve to at least partially solve the problems in the prior art. SUMMARY

[0004] A series of simplified concepts are introduced in the summary part, which will be further described in detail in the specific embodiment part. The summary part of the present application does not mean to try to limit the key features and necessary technical features of the claimed technical solution, and even less to try to determine the protection scope of the claimed technical solution.

[0005] To at least partially solve the above problems, the present application provides an ultra-low temperature high pressure ball valve, comprising: an ultra-low temperature high pressure ball valve, characterized in that it comprises: a spherical valve, a sealing pair, a valve body, a valve cover and a valve stem; the spherical valve is arranged in the valve body, and the spherical valve is sealingly connected with the inner wall of the valve body through the sealing pair, the top of the valve body is provided with a valve cover, the valve stem is arranged in the valve cover, the bottom of the valve stem is connected with the top of the spherical valve, the top of the valve stem extends to the outside of the valve cover and is connected with an operating handle, and a temperature insulation transmission member is arranged on the valve stem.

[0006] Preferably, the valve cover comprises a bottom cover, an extended neck and a stuffing box, the bottom cover is connected with the stuffing box through the extended neck, the bottom cover is connected with the valve body, the bottom of the valve rod is provided with a limiting clamping table, the bottom of the valve rod is clamped with the bottom surface of the bottom cover through the limiting clamping table, and the temperature insulation transmission member is located in the stuffing box.

[0007] Preferably, the bottom of the spherical valve is connected with the inner bottom of the valve body, the top of the spherical valve is clamped with the bottom of the valve rod, and the outer wall of the extended neck is provided with a drip plate, and the diameter of the drip plate is greater than the diameter of the stuffing box.

[0008] Preferably, the valve rod comprises a lower rod and an upper rod; the top of the lower rod is connected with the bottom of the upper rod through the temperature insulation transmission member, the bottom of the lower rod is connected with the top of the spherical valve, and the top of the upper rod extends to the outside of the stuffing box and is connected with the operating handle.

[0009] Preferably, the temperature insulation transmission member comprises a transmission assembly and a sealing assembly; the sealing assembly is arranged in the inside of the transmission assembly, the bottom of the sealing assembly is connected with the transmission assembly, the top of the sealing assembly is connected with the upper rod, and the bottom of the transmission assembly is clamped with the top of the lower rod.

[0010] Preferably, the transmission assembly comprises a displacement tube and a rotating rod; the sealing assembly, the displacement tube and the rotating rod are all arranged in the stuffing box, the bottom of the stuffing box is provided with a through hole, the bottom of the rotating rod is provided with a clamping joint, the clamping joint extends to the outside of the stuffing box through the through hole and is clamped with the top of the lower rod, the outer wall of the rotating rod is movably connected with the inner wall of the displacement tube, the outer wall of the displacement tube is movably connected with the inner wall of the stuffing box, the top of the displacement tube is provided with a piston head, and the bottom of the sealing assembly is connected with the piston head.

[0011] Preferably, the inner wall of the stuffing box, the inner wall and the outer wall of the displacement tube and the outer wall of the rotating rod are all provided with semispherical grooves in a threaded manner, the semispherical grooves of the outer wall of the rotating rod and the inner wall of the displacement tube form an internal threaded ball groove, the semispherical grooves of the outer wall of the displacement tube and the inner wall of the stuffing box form an external threaded ball groove, and transmission balls are arranged in the internal threaded ball groove and the external threaded ball groove.

[0012] Preferably, the transmission assembly further comprises a hydraulic control assembly; the piston head comprises a first piston and a second piston, the first piston is arranged at the top of the displacement tube, the second piston is arranged at the bottom of the sealing assembly, and the side wall of the second piston is movably and sealingly connected with the inner wall of the stuffing box, the second piston is located above the first piston, the side wall of the stuffing box is provided with a hydraulic hole, the hydraulic hole is located between the first piston and the second piston, the hydraulic control assembly communicates with the inside of the stuffing box through the hydraulic hole, the sealing assembly is connected with the second piston and selectively penetrates the second piston to be connected with the first piston, and the upper rod is provided with a locking device.

[0013] Preferably, the sealing assembly comprises a connecting rod, a threaded top rod, an inner compression expansion piece, an outer compression expansion piece and a stuffing piece; the top of the connecting rod is connected with the bottom of the upper rod, the connecting rod is provided with a threaded through hole, the threaded tube through hole penetrates the connecting rod and the upper rod, the threaded top rod comprises an adjusting section and a connecting section, the connecting section is arranged at the bottom of the adjusting section, and the diameter of the connecting section is smaller than that of the adjusting section, the adjusting section is arranged in the threaded tube through hole and is threadedly connected with the connecting rod, the bottom of the connecting section is connected with the piston head, the outer compression expansion piece is arranged at the bottom of the connecting rod and abuts against the top of the piston head, the connecting section is provided with the inner compression expansion piece and a shaft sleeve, the bottom of the shaft sleeve penetrates the bottom of the outer compression expansion piece and is connected with the top of the piston head, the bottom of the inner compression expansion piece abuts against the top of the shaft sleeve, and the top abuts against the bottom of the adjusting section, and the stuffing piece is arranged on the outer wall of the connecting rod.

[0014] Preferably, the side wall of the connecting rod is provided with a stuffing area, the outer wall of the connecting rod in the stuffing area is spirally provided with a slide rail, the shape of the stuffing piece is adapted to the inner wall of the stuffing box, and the stuffing piece is provided with a sliding groove adapted to the slide rail.

[0015] Compared with the prior art, the present application at least has the following beneficial effects:

[0016] The spherical valve, sealing pair, valve body and valve cover in the application are the conventional structures of the ultra-low temperature high-pressure ball valve, and the specific model and principle will not be described again, a temperature insulation transmission member is arranged on the valve rod to perform temperature insulation, so as to reduce the transmission of cold quantity to the operating handle, the temperature insulation transmission member simultaneously plays the role of packing seal between the valve rod and the valve cover, therefore, the temperature insulation transmission member can avoid the influence of cold quantity on the packing inside the temperature insulation transmission member, and further reduce the influence of cold quantity transmission on the seal between the valve cover and the valve rod. The temperature insulation transmission member has the transmission function while playing the temperature insulation role, and can rotate the valve rod without affecting the rotation of the valve rod. The length of the valve rod can be effectively shortened through the temperature insulation transmission member, so as to reduce the height of the valve cover exposed outside the heat preservation layer, and further effectively reduce the volume of the ultra-low temperature high-pressure ball valve, and effectively increase the construction space.

[0017] The ultra-low temperature high-pressure ball valve, other advantages, objects and characteristics of the application will be embodied by the following description, and will be understood by the person skilled in the art through the research and practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, and are used together with the embodiments of the application to explain the application, and do not constitute a limitation on the application. In the drawings:

[0019] Figure 1 It is a sectional view of the ultra-low temperature high-pressure ball valve.

[0020] Figure 2 It is a sectional view of the transmission assembly in the ultra-low temperature high-pressure ball valve.

[0021] Figure 3 It is a structural schematic view of the transmission assembly in the ultra-low temperature high-pressure ball valve (the packing box and the transmission ball are shown).

[0022] Figure 4 It is a sectional view of the sealing assembly in the ultra-low temperature high-pressure ball valve.

[0023] Figure 5 It is a structural schematic view of the sealing assembly in the ultra-low temperature high-pressure ball valve.

[0024] Figure 6 It is a sectional view of the packing member in the ultra-low temperature high-pressure ball valve.

[0025] Figure 7 It is a sectional view of the first embodiment of the temperature insulation transmission member in the ultra-low temperature high-pressure ball valve.

[0026] Figure 8It is a sectional view of the second embodiment of the temperature insulation transmission member of the ultra-low temperature high-pressure ball valve.

[0027] In the figure: 1 ball valve, 2 sealing pair, 3 valve body, 4 valve cover, 41 bottom cover, 42 extension neck, 43 stuffing box, 44 drip plate, 5 valve stem, 51 lower stem, 52 upper stem, 6 temperature insulation transmission member, 7 transmission assembly, 71 transmission ball, 72 displacement tube, 73 rotating rod, 74 piston head, 741 first piston, 742 second piston, 75 hydraulic hole, 8 sealing assembly, 81 connecting rod, 811 sliding rail, 82 threaded top rod, 83 inner compression expansion member, 84 outer compression expansion member, 85 filler member, 851 sliding groove, 86 shaft sleeve. DETAILED DESCRIPTION

[0028] The application will be further described in detail below with reference to the accompanying drawings and examples, so that those skilled in the art can implement the application according to the description.

[0029] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0030] As Figures 1-8 shown, the application provides an ultra-low temperature high-pressure ball valve, comprising: a ball valve 1, a sealing pair 2, a valve body 3, a valve cover 4 and a valve stem 5; the ball valve 1 is arranged in the valve body 3, and the ball valve 1 is sealingly connected with the inner wall of the valve body 3 through the sealing pair 2, the top of the valve body 3 is provided with the valve cover 4, the valve stem 5 is arranged in the valve cover 4, the bottom of the valve stem 5 is connected with the top of the ball valve 1, the top of the valve stem 5 extends to the outside of the valve cover 4 and is connected with an operating handle, and the valve stem 5 is provided with a temperature insulation transmission member 6.

[0031] The working principle and beneficial effects of the above technical solution are as follows: the ball valve 1, the sealing pair 2, the valve body 3 and the valve cover 4 in the application are all conventional structures of the ultra-low temperature high-pressure ball valve, and the specific model and principle will not be described again, and the temperature insulation transmission member 6 is arranged on the valve stem 5 to perform temperature insulation, so as to reduce the transmission of cold quantity to the operating handle through the valve stem 5, the temperature insulation transmission member 6 simultaneously plays the role of filler sealing between the valve stem 5 and the valve cover 4, so that the temperature insulation transmission member 6 can avoid the transmission of cold quantity to the operating handle and the influence of cold quantity on the filler inside the temperature insulation transmission member 6, thereby reducing the influence of cold quantity transmission on the sealing between the valve cover 4 and the valve stem 5. The temperature insulation transmission member 6 has the functions of temperature insulation and transmission at the same time, and can not affect the rotation of the valve stem 5 while insulating the temperature. The length of the valve stem 5 can be effectively shortened through the temperature insulation transmission member 6, so as to reduce the height of the valve cover 4 exposed outside the heat preservation layer, thereby effectively reducing the volume of the ultra-low temperature high-pressure ball valve and effectively increasing the construction space.

[0032] In one embodiment, the valve cover 4 comprises a bottom cover 41, an extended neck 42 and a stuffing box 43, the bottom cover 41 is connected with the stuffing box 43 through the extended neck 42, the bottom cover 41 is connected with the valve body 3, the bottom of the valve rod 5 is provided with a limiting clamping table, the bottom of the valve rod 5 is clamped with the bottom surface of the bottom cover 41 through the limiting clamping table. The temperature insulation transmission member 6 is located in the stuffing box 43. The bottom of the spherical valve 1 is connected with the inner bottom of the valve body 3, the top of the spherical valve 1 is clamped with the bottom of the valve rod 5, the outer wall of the extended neck 42 is provided with a drip plate 44, the diameter of the drip plate 44 is greater than the diameter of the stuffing box 43. The valve rod 5 comprises a lower rod 51 and an upper rod 52; the top of the lower rod 51 is connected with the bottom of the upper rod 52 through the temperature insulation transmission member 6, the bottom of the lower rod 51 is connected with the top of the spherical valve 1, the top of the upper rod 52 extends to the outside of the stuffing box 43 and is connected with the operating handle. The temperature insulation transmission member 6 comprises a transmission assembly 7 and a sealing assembly 8; the sealing assembly 8 is arranged in the inside of the transmission assembly 7, the bottom of the sealing assembly 8 is connected with the transmission assembly 7, the top of the sealing assembly 8 is connected with the upper rod 52, and the bottom of the transmission assembly 7 is clamped with the top of the lower rod 51.

[0033] The working principle and beneficial effects of the above technical solution are as follows: in the present application, the valve cover 4 can be divided into the bottom cover 41, which is used for connection, fixation and sealing with the valve body 3, which is a conventional technical means; the extended neck 42, which is used for accommodating the lower rod 51 and providing support for the installation of the drip plate 44; the stuffing box 43, which is used for arranging the transmission assembly 7 and the sealing assembly 8; when the cold quantity is transmitted, the cold quantity diffused by the valve body 3 and the bottom cover 41 is not described here), the cold quantity is first transmitted to the lower end of the lower rod 51 via the spherical valve 1, because the extended neck 42 has a certain length, so that the cold quantity is lost when transmitted from the lower end to the upper end of the lower rod 51, so that the temperature of the upper end is higher than that of the lower end (the principle applied in the prior art is the same, so a relatively long valve rod 5 is required in the prior art), when the cold quantity is transmitted to the transmission assembly 7 via the upper end of the lower rod 51, the split connection structure of the transmission assembly 7 can greatly block the transmission of the cold quantity, so that the temperature acting on the sealing assembly 8 does not affect the filler therein, after the cold quantity is blocked again by the sealing assembly 8, the cold quantity is transmitted to the operating handle through the upper rod 52, so that the temperature of the operating handle tends to be normal or reaches a temperature that will not cause cold burns, thereby avoiding frostbite of the operator, and at the same time, as the temperature rises, the condensation of the condensate at the stuffing box 43 is reduced, and the influence of the condensate on the heat preservation layer and the valve body 3 is reduced.

[0034] The first embodiment of the temperature insulation transmission member is that the transmission assembly 7 comprises a displacement tube 72 and a rotating rod 73; the sealing assembly 8, the displacement tube 72 and the rotating rod 73 are all arranged in the stuffing box 43, the bottom of the stuffing box 43 is provided with a through hole, the bottom of the rotating rod 73 is provided with a clamping joint, the clamping joint extends to the outside of the stuffing box 43 through the through hole and is clamped with the top of the lower rod 51, the outer wall of the rotating rod 73 is movably connected with the inner wall of the displacement tube 72, the outer wall of the displacement tube 72 is movably connected with the inner wall of the stuffing box 43, the top of the displacement tube 72 is provided with a piston head 74, and the bottom of the sealing assembly 8 is connected with the piston head 74. The inner wall of the stuffing box 43, the inner wall and the outer wall of the displacement tube 72 and the outer wall of the rotating rod 73 are all provided with semispherical grooves in a threaded manner, the semispherical grooves of the outer wall of the rotating rod 73 and the inner wall of the displacement tube 72 form an internal threaded ball groove, and the semispherical grooves of the outer wall of the displacement tube 72 and the inner wall of the stuffing box 43 form an external threaded ball groove, and a transmission ball 71 is arranged in the internal threaded ball groove and the external threaded ball groove. The sealing assembly 8 comprises a connecting rod 81, a threaded top rod 82, an inner compression expansion piece 83, an outer compression expansion piece 84 and a filler 85; the top of the connecting rod 81 is connected with the bottom of the upper rod 52, the connecting rod 81 is provided with a threaded through hole, the threaded tube through hole penetrates the connecting rod 81 and the upper rod 52, the threaded top rod 82 comprises an adjusting section and a connecting section, the connecting section is arranged at the bottom of the adjusting section and has a smaller diameter than the adjusting section, the adjusting section is arranged in the threaded tube through hole and is threadedly connected with the connecting rod 81, the bottom of the connecting section is connected with the piston head 74, the outer compression expansion piece 84 is arranged at the bottom of the connecting rod 81 and abuts against the top of the piston head 74, the connecting section is provided with the inner compression expansion piece 83 and a shaft sleeve 86, the bottom of the shaft sleeve 86 penetrates the bottom of the outer compression expansion piece 84 and is connected with the top of the piston head 74, the bottom of the inner compression expansion piece 83 abuts against the top of the shaft sleeve 86 and the bottom of the adjusting section, and the filler 85 is arranged on the outer wall of the connecting rod 81. The side wall of the connecting rod 81 is provided with a filler area, the filler area is located above the outer compression expansion piece 84, the outer wall of the connecting rod 81 in the filler area is provided with a slide rail 811 in a spiral manner, the filler 85 is shaped to be adapted to the inner wall of the stuffing box 43, and the filler 85 is provided with a sliding groove 851 adapted to the slide rail 811.

[0035] The working principle and beneficial effects of the above technical solutions are as follows: the ultra-low temperature high-pressure ball valve of the present application provides two implementation modes, the first implementation mode is manual implementation, and the second implementation mode is hand and self-integrated; the main structural difference between the first implementation mode and the second implementation mode is that the piston head 74 of the first implementation mode is integral, and the piston head 74 of the second implementation mode is split. Regardless of which implementation mode, the principle of the sealing assembly 8 is the same. When assembling the sealing assembly 8, the packing piece 85 needs to be sleeved into the packing area from the bottom of the connecting rod 81, the packing area is located at the bottom of the connecting rod 81, and the outer diameter of the packing area of the connecting rod 81 is smaller than the outer diameter of the non-packing area of the connecting rod 81, so that the clamping table formed at the connecting rod 81 and the packing area is used for clamping the packing piece 85, the packing piece 5 is provided with a sliding groove 851, and when the packing piece 5 is sleeved in the packing area, the packing piece 85 can be rotated and slid into the packing area along the spiral sliding rail 811, and is clamped with the clamping table between the connecting rod 81 and the packing area to prevent falling out. The packing piece 85 includes but is not limited to conventional packing and its supporting components composed of a gasket, a spring, a packing pad, a PTFE packing group, a spacer ring, graphite packing, etc. After the packing piece 85 is installed, a hexagonal wrench (or other supporting tools) is used to enter and screw the threaded top rod 82 from the threaded penetration hole at the top of the upper rod 52. When screwing, the threaded top rod 82 will move downward relative to the connecting rod 81, the bottom of the adjusting section presses the top of the inner compression expansion piece 83 downward, and the shaft sleeve 86 moves upward relative to the connecting section to press the bottom of the inner compression expansion piece 83, so that the inner compression expansion piece 83 is expanded due to being compressed upward and downward, and the bottom of the connecting rod 81 presses the top of the outer compression expansion piece 84 downward, and the top of the piston head 74 presses the bottom of the outer compression expansion piece 84 upward, so that the outer compression expansion piece 84 is also compressed. Because the outer compression expansion piece 84 is located outside the inner compression expansion piece 83, and the bottom of the inner compression expansion piece 83 is compressed by the shaft sleeve 86, the bottom position is higher than the bottom of the outer compression expansion piece 84, so the inner compression expansion piece 83 will preferentially extrude and deform, and the deformation amplitude is greater than that of the outer compression expansion piece 84. The inner compression expansion piece 83 can support the outer compression expansion piece 84 during expansion to avoid damage caused by the outer compression expansion piece 84 bending inward during extrusion. Meanwhile, the preferential expansion of the inner compression expansion piece 83 can support the top of the outer compression expansion piece 84, so that the top of the outer compression expansion piece 84 will abut against the bottom of the packing piece 85 after the inner compression expansion piece 83 is compressed and expanded, thereby freeing the hands of the operator and preventing the packing piece 85 from falling off. The inner compression expansion piece 83 and the outer compression expansion piece 84 can be composed of a vertical elastic tube or any compression expansion structure.With the pressure of the outer compression expansion piece 84 on the packing piece 85 gradually increasing, the packing pieces 85 can be squeezed together while rotating, increasing the pressure between the packing pieces 85 (principle similar to the threaded cooperation of a nut and a screw cap), and the packing pieces 85 that are squeezed and deformed by force can also be more closely attached to the inner wall of the packing box 43, thereby increasing the sealing performance between the packing pieces 85. The bottom of the connecting section is connected with the piston head 74, and the connecting section not only plays a role of connecting and driving the sealing assembly 8 and the transmission assembly 7, but also plays a role of limiting and adjusting the inner compression expansion piece 83 and the outer compression expansion piece 84. When the relative position between the bottom of the connecting rod 81 and the top of the piston head 74 is adjusted by the threaded jacking rod 82, the air pressure between the packing piece 85 and the piston head 74 increases, thereby further pushing the bottom of the packing piece 85 through the air pressure, and increasing the sealing effect of the packing piece 85. In the long-term use of the ultra-low temperature ball valve, once the packing piece 85 is found to be aged and the sealing is not tight, and the gas is slightly leaked, the pressure between the packing pieces 85 can be adjusted by rotating the threaded jacking rod 82 to solve the problem of aging and poor sealing of the packing piece 85, and to avoid safety accidents caused by continuous gas leakage.

[0036] When the operating handle drives the upper rod 52 to move downward, the upper rod 52 drives the connecting rod 81 to move downward, the connecting rod 81 drives the piston head 74 to move downward through the threaded jacking rod 82, and then the displacement tube 72 moves downward, the displacement tube 72 can realize the downward movement of the displacement tube 72 relative to the inner wall of the packing box 43 through the transmission ball 71 in the external threaded ball groove, the bottom of the rotating rod 73 is clamped with the lower rod 51 through the clamp joint, so that the displacement tube 72 moves downward while realizing the downward movement of the displacement tube 72 relative to the rotating rod 73 through the transmission ball 71 in the internal threaded ball groove, and the rotating rod 73 rotates relative to the displacement tube 72, thereby driving the lower rod 51 to rotate to realize the opening and closing of the spherical valve 1.

[0037] It should be noted that the transmission ball 71 is arranged in the hemispherical groove in the inner and outer walls of the displacement tube 72, and the two ends of the hemispherical groove in the inner and outer walls of the displacement tube 72 are closed ends, the heights of the upper and lower ends of the hemispherical grooves of the packing box 43 and the rotating rod 73 are greater than the heights of the upper and lower ends of the hemispherical groove of the displacement tube 72, thereby avoiding the transmission ball 71 from falling off the hemispherical groove of the packing box 43 or the rotating rod 73 in the process of moving up and down in the displacement tube 72.

[0038] The cold energy is transmitted to the rotating rod 73 through the joint at the upper end of the lower rod 51 to perform the first cold energy isolation; then the cold energy of the rotating rod 73 is transmitted to the displacement pipe 72 through the transmission ball 71 to perform the second cold energy isolation; the cold energy is transmitted from the displacement pipe 72 to the threaded ejector rod 82 to perform the third cold energy isolation; finally, the cold energy is transmitted to the connecting rod 81 through the threaded ejector rod 82 to perform the fourth cold energy isolation; the cold energy transmission between the connecting rod 81 and the filler 85, the cold energy transmission between the connecting rod 81 and the upper rod 52, and the cold energy transmission between the upper rod 52 and the operating handle can be ignored. Through the split transmission of the transmission assembly 7, the cold energy transmission is isolated, and then the cold energy transmission is isolated through a small number of energy transmissions, so that the cold energy isolation can be realized in a very short valve rod 5 length, thereby reducing the volume of the ultra-low temperature high-pressure ball valve.

[0039] The second embodiment of the temperature insulation transmission member is that the transmission assembly 7 further comprises a hydraulic control assembly; the piston head 74 comprises a first piston 741 and a second piston 742, the first piston 741 is arranged at the top of the displacement pipe 72, the second piston 742 is arranged at the bottom of the sealing assembly 8, and the side wall of the second piston 742 is in movable sealing connection with the inner wall of the stuffing box 43, the second piston 742 is located above the first piston 741, the side wall of the stuffing box 43 is provided with a hydraulic hole 75, the hydraulic hole 75 is located between the first piston 741 and the second piston 742, the hydraulic control assembly communicates with the inside of the stuffing box 43 through the hydraulic hole 75, the sealing assembly 8 is connected with the second piston 742 and selectively penetrates the second piston 742 to connect with the first piston 741, and the upper rod 52 is provided with a locking device.

[0040] The working principle and beneficial effects of the above technical solution are as follows: the second embodiment of the temperature insulation transmission member is provided, and the basic principle is the same as that of the first embodiment. In this embodiment, the piston head 74 comprises a first piston 741 for connecting with the displacement pipe 72 and a second piston 742 for connecting with the sealing assembly 8.

[0041] When the user needs to manually control, the hydraulic control assembly is first in a hydraulic release state, the upper rod 52 is adjusted, the threaded ejector rod 82 penetrates the second piston 742 to connect with the first piston 741, so that the first piston 741 and the second piston 742 form an integral whole, then the use state of the hydraulic control assembly is changed (or the first piston 741 and the second piston 742 are located at a position where the hydraulic hole 75 can be sealed), so that the stuffing box 43 can maintain a sealed state even if there is the hydraulic hole 75, at this time, the use mode is the same as that of the first embodiment.

[0042] When the user needs to be automatically controlled, first, the upper rod 52 is locked and fixed through the locking device, to prevent the second piston 742 from moving, then the hydraulic control assembly injects hydraulic oil between the first piston 741 and the second piston 742 through the hydraulic hole 75, and then controls the hydraulic size, when the hydraulic pressure between the first piston 741 and the second piston 742 increases, the first piston 741 moves downward, thereby driving the transmission assembly 7 to rotate the lower rod 51, when the hydraulic pressure is reduced, the first piston 741 moves upward to reset, thereby driving the transmission assembly 7 to rotate the lower rod 51 to reset.

[0043] Through the design of the above structure, the automatic opening and closing of the ultra-low temperature high-pressure ball valve can be realized, and the automatic and manual can be switched as needed, so that the remote and intelligent control of the hydraulic control assembly can be realized.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0045] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] Although the embodiments of the present application have been disclosed as above, they are not limited only to the applications listed in the specification and embodiments, and can be fully applied to various fields suitable for the present application, and additional modifications can be easily realized by those skilled in the art, therefore, the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A cryogenic high-pressure ball valve, characterized in that, include: A ball valve (1), a sealing pair (2), a valve body (3), a valve cover (4), and a valve stem (5); the ball valve (1) is disposed inside the valve body (3), and the ball valve (1) is sealed to the inner wall of the valve body (3) through the sealing pair (2). The valve body (3) is provided with a valve cover (4) at the top. The valve stem (5) is disposed inside the valve cover (4). The bottom of the valve stem (5) is connected to the top of the ball valve (1). The top of the valve stem (5) extends to the outside of the valve cover (4) and is connected to the operating handle. A heat-insulating transmission component (6) is provided on the valve stem (5). The valve cover (4) includes a bottom cover (41), an extension neck (42), and a stuffing box (43). The bottom cover (41) is connected to the stuffing box (43) through the extension neck (42). The bottom cover (41) is connected to the valve body (3). A limiting plate is provided at the bottom of the valve stem (5). The bottom of the valve stem (5) is engaged with the bottom surface of the bottom cover (41) through the limiting plate. The thermal insulation transmission component (6) is located inside the stuffing box (43). The valve stem (5) includes a lower stem (51) and an upper stem (52); the top of the lower stem (51) is connected to the bottom of the upper stem (52) through the thermal insulation transmission member (6), the bottom of the lower stem (51) is connected to the top of the ball valve (1), and the top of the upper stem (52) extends to the outside of the stuffing box (43) and is connected to the operating handle; The thermal insulation transmission component (6) includes a transmission assembly (7) and a sealing assembly (8); the sealing assembly (8) is disposed inside the transmission assembly (7), the bottom of the sealing assembly (8) is connected to the transmission assembly (7), the top of the sealing assembly (8) is connected to the upper rod (52), and the bottom of the transmission assembly (7) is engaged with the top of the lower rod (51). The transmission assembly (7) includes a displacement tube (72) and a rotating rod (73); the sealing assembly (8), the displacement tube (72) and the rotating rod (73) are all disposed in the stuffing box (43). The bottom of the stuffing box (43) is provided with a through hole. The bottom of the rotating rod (73) is provided with a snap-fit ​​connector. The snap-fit ​​connector extends through the through hole to the outside of the stuffing box (43) and snaps against the top of the lower rod (51). The outer wall of the rotating rod (73) is movably connected to the inner wall of the displacement tube (72). The outer wall of the displacement tube (72) is movably connected to the inner wall of the stuffing box (43). The top of the displacement tube (72) is provided with a piston head (74). The bottom of the sealing assembly (8) is connected to the piston head (74). The inner wall of the stuffing box (43), the inner and outer walls of the displacement tube (72), and the outer wall of the rotating rod (73) are all provided with hemispherical grooves in a threaded manner. The hemispherical grooves on the outer wall of the rotating rod (73) and the inner wall of the displacement tube (72) constitute an internal threaded ball groove, and the hemispherical grooves on the outer wall of the displacement tube (72) and the inner wall of the stuffing box (43) constitute an external threaded ball groove. A transmission ball (71) is provided in both the internal threaded ball groove and the external threaded ball groove.

2. The cryogenic high-pressure ball valve according to claim 1, characterized in that, The bottom of the ball valve (1) is axially connected to the inner bottom of the valve body (3), the top of the ball valve (1) is snapped into the bottom of the valve stem (5), and a drip plate (44) is provided on the outer wall of the extension neck (42), the diameter of the drip plate (44) being larger than the diameter of the packing box (43).

3. The cryogenic high-pressure ball valve according to claim 1, characterized in that, The transmission assembly (7) further includes a hydraulic control assembly; the piston head (74) includes a first piston (741) and a second piston (742), the first piston (741) is disposed at the top of the displacement tube (72), the second piston (742) is disposed at the bottom of the sealing assembly (8), and the side wall of the second piston (742) is movably and sealingly connected to the inner wall of the stuffing box (43), the second piston (742) is located above the first piston (741), the side wall of the stuffing box (43) is provided with a hydraulic hole (75), the hydraulic hole (75) is located between the first piston (741) and the second piston (742), the hydraulic control assembly communicates with the interior of the stuffing box (43) through the hydraulic hole (75), the sealing assembly (8) is connected to the second piston (742) and selectively penetrates the second piston (742) to connect with the first piston (741), and the upper rod (52) is provided with a locking device.

4. The cryogenic high-pressure ball valve according to claim 1, characterized in that, The sealing assembly (8) includes a connecting rod (81), a threaded push rod (82), an internal compression expansion member (83), an external compression expansion member (84), and a packing member (85); the top of the connecting rod (81) is connected to the bottom of the upper rod (52), and the connecting rod (81) is provided with a threaded through hole, the threaded tube through hole passing through the connecting rod (81) and the upper rod (52); the threaded push rod (82) includes an adjusting section and a connecting section, the connecting section is located at the bottom of the adjusting section, and the diameter of the connecting section is smaller than the diameter of the adjusting section; the adjusting section is located in the threaded tube through hole and is connected to the connecting rod (81) and the upper rod (52). 1) Threaded connection, the bottom of the connecting section is connected to the piston head (74), the external compression expansion member (84) is disposed at the bottom of the connecting rod (81) and abuts against the top of the piston head (74), the connecting section is provided with the internal compression expansion member (83) and the bushing (86), the bottom of the bushing (86) passes through the bottom of the external compression expansion member (84) and is connected to the top of the piston head (74), the bottom of the internal compression expansion member (83) abuts against the top of the bushing (86), and the top abuts against the bottom of the adjusting section, the packing member (85) is disposed on the outer wall of the connecting rod (81).

5. The cryogenic high-pressure ball valve according to claim 4, characterized in that, The side wall of the connecting rod (81) is provided with a filling area, which is located above the external compression expansion member (84). The outer wall of the connecting rod (81) located in the filling area is provided with a slide rail (811) in a spiral shape. The shape of the filling member (85) is adapted to the inner wall of the filling box (43), and the filling member (85) is provided with a slide groove (851) adapted to the slide rail (811).

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