Ultralow-temperature jacket ball valve

Abstract

The utility model discloses an ultralow-temperature jacket ball valve, and relates to the technical field of valves. Comprising a handle assembly, a center shaft assembly, a valve body, a valve deck and a steel ball, the handle assembly is fixedly connected with the top of the center shaft assembly, the center shaft assembly is connected with the steel ball, the steel ball is arranged in the valve body, one end of the valve body is connected with the valve deck, and the packing assembly comprises a sealing support, valve rod packing and a low-temperature O-shaped ring. The multiple valve rod fillers and the low-temperature O-shaped ring are arranged in the sealing support and installed on the middle shaft assembly, and the low-temperature O-shaped ring is arranged below the multiple valve rod fillers. The heat preservation jacket is installed on the valve body, and the jacket flanges are fixedly installed on the two sides of the heat preservation jacket. The valve is used for solving the problems in the aspects of sealing performance and cold insulation capacity, and a more reliable and efficient valve solution is provided for ultralow-temperature equipment.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to an ultra-low temperature jacketed ball valve. Background Art

[0002] The seat seal structure of cryogenic ball valves currently used in low-temperature applications such as liquefied natural gas, air separation, and ethylene production largely follows the design principles of normal-temperature ball valves, but uses ultra-low-temperature-resistant PCTFE polymer. PCTFE has excellent low-temperature crack resistance, but its high hardness places extremely high demands on the fit precision between the valve ball and seat. However, the widely used cryogenic ball valves still have some significant design limitations.

[0003] First, under conditions of frequent switching between high and low pressure, the sealing effect is prone to fluctuations and may even cause leakage, thus affecting the overall performance of the ball valve and the safety of the system. Secondly, due to the high hardness and fitting accuracy of PCTFE material, the opening and closing torque of the ball valve is often unstable. In actual operation, it is easy for the torque to be too large or too small. Excessive torque may cause damage to the ball valve or difficulty in operation, while too small torque may cause poor sealing or leakage, which not only affects the service life of the ball valve, but also increases operational risks and maintenance costs. In addition, most of the existing ultra-low temperature ball valves adopt a design without an insulation jacket, which cannot keep the medium passing through the ball valve cold for a long time. During the transportation of ultra-low temperature liquid medium, energy loss and an increase in medium temperature will occur, affecting the overall efficiency of the system.

[0004] Therefore, the market urgently needs an ultra-low temperature jacketed ball valve that can achieve better sealing effect and more stable opening and closing torque to suit more and more ultra-low temperature equipment. Utility Model Content

[0005] The utility model provides an ultra-low temperature jacketed ball valve, which solves the problems in sealing performance and cold preservation capacity, and provides a more reliable and efficient valve solution for ultra-low temperature equipment.

[0006] The technical solutions used in this utility model are as follows:

[0007] A cryogenic jacketed ball valve, comprising a handle assembly, a central axis assembly, a valve body, a valve cover, and a steel ball, wherein the handle assembly is fixedly connected to the top of the central axis assembly, the central axis assembly is connected to the steel ball, the steel ball is disposed within the valve body, and one end of the valve body is connected to the valve cover, further comprising:

[0008] The packing assembly includes a sealing bracket, a valve stem packing and a low-temperature O-ring. The sealing bracket is fixedly mounted on the top of the central shaft assembly. The valve stem packing is provided with a plurality of valve stem packings. The plurality of valve stem packings and the low-temperature O-rings are arranged in the sealing bracket and mounted on the central shaft assembly. The low-temperature O-rings are arranged below the plurality of valve stem packings.

[0009] A thermal insulation jacket and a jacket flange, wherein the thermal insulation jacket is mounted on the valve body, and the jacket flange is fixedly mounted on both sides of the thermal insulation jacket.

[0010] Furthermore, the handle assembly includes a handle rubber sleeve, a steel tube handle and a handle connecting block, the handle rubber sleeve is installed at both ends of the steel tube handle, the steel tube handle is fixedly connected to the handle connecting block, and the handle connecting block is fixedly connected to the top of the central axis assembly.

[0011] Furthermore, it also includes a positioning piece and a limiting bolt, the positioning piece is fixed to the bottom of the handle assembly, and the limiting bolt is fixed to a corner of the top of the filler assembly.

[0012] Furthermore, the central axis assembly includes an extended valve stem, a rod sleeve and a base frame, the top end of the extended valve stem is fixedly connected to the handle assembly, the bottom end of the extended valve stem passes through the valve body and is connected to the steel ball, the rod sleeve is fixed to the outside of the extended valve stem, the top end of the rod sleeve is fixedly connected to the packing assembly, the bottom end of the rod sleeve is fixedly connected to the base frame, the base frame is fixedly connected to the valve body, and a sealing ring is provided at the connection between the base frame and the valve body.

[0013] Furthermore, the packing assembly further includes a glam, which is disposed in the sealing bracket and mounted on the central shaft assembly, and the glam is located above the plurality of valve stem packings.

[0014] Furthermore, the packing assembly also includes a fastening bolt and a disc-shaped spring piece, which are arranged in the sealing bracket and installed on the central axis assembly. The disc-shaped spring piece is located above the glam, and the fastening bolt is located above the disc-shaped spring piece.

[0015] Furthermore, one end of the valve body is connected to the valve cover via a plurality of hexagon socket bolts.

[0016] Furthermore, a sewage discharge component is provided at the bottom of the thermal insulation jacket, and the sewage discharge component includes a sewage discharge port and a sewage discharge plug, and the sewage discharge plug cooperates with the sewage discharge port.

[0017] Furthermore, two soft valve seats are provided in the valve body, and the two soft valve seats are located on both sides of the steel ball. An elastic compensation component is provided on one side of the inner cavity of the valve cover, and the elastic compensation component abuts against one of the soft valve seats.

[0018] Furthermore, the elastic force compensation component includes a valve seat pressure ring and a disc spring, the valve seat pressure ring abuts against the soft valve seat, and the disc spring is located between the valve seat pressure ring and the inner cavity of the valve cover.

[0019] The beneficial effects of the utility model are:

[0020] 1. The utility model is equipped with an insulation jacket and jacket flange, which allows the valve body to maintain uniform heat and cold for a long time. By extracting the air in the insulation jacket to create a vacuum environment, or adding a cold insulation medium in the insulation jacket, energy loss and medium temperature rise are effectively reduced, thereby improving the overall efficiency of the system.

[0021] 2. This utility model significantly improves the sealing performance of the ball valve by introducing a packing assembly, specifically a design that includes multiple stem packings and low-temperature O-rings. The stem packings fit tightly against the center shaft assembly, effectively preventing media leakage. The low-temperature O-rings further enhance the sealing effect in ultra-low temperature environments, ensuring that the ball valve maintains a stable seal even under extreme conditions, ensuring safe system operation.

[0022] 3. The fixed connection design between the handle assembly and the central axis assembly in the utility model enables the operator to easily and accurately control the opening and closing of the ball valve, which not only improves the convenience of operation, but also ensures that the ball valve can remain stable during operation, reducing the safety hazards caused by improper operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of the ultra-low temperature jacketed ball valve provided by the utility model;

[0024] Figure 2 This is a cross-sectional view of the ultra-low temperature jacketed ball valve provided by the utility model;

[0025] Figure 3 for Figure 2 A magnified view of the structure of area A in the middle;

[0026] Figure 4 for Figure 2 A magnified view of the structure of region B in the middle.

[0027] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0028] 1. Handle rubber sleeve; 2. Steel pipe handle; 3. Handle connecting block; 4. Positioning piece; 5. Packing assembly; 6. Central shaft assembly; 7. Limit bolt; 8. Valve body; 9. Sealing ring; 10. Jacket flange; 11. Valve cover; 12. Insulation jacket; 13. Hexagon socket bolt; 14. Drain assembly; 15. Steel ball; 16. Soft valve seat; 17. Elastic compensation assembly; 51. Sealing bracket; 52. Stem packing; 53. Low-temperature O-ring; 54. Glam; 55. Disc spring; 56. Fastening bolt; 61. Extended valve stem; 62. Rod sleeve; 63. Base frame; 141. Drain port; 142. Drain plug; 171. Seat pressure ring; 172. Disc spring. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings.

[0031] like Figures 1-4 As shown, this embodiment provides an ultra-low temperature jacketed ball valve, including a handle assembly, a packing assembly 5, a central axis assembly 6, a positioning piece 4, a limiting bolt 7, a valve body 8, a valve cover 11 and a steel ball 15. The handle assembly is fixedly connected to the top of the central axis assembly 6, the positioning piece 4 is fixed to the bottom of the handle assembly, the limiting bolt 7 is fixedly installed on the top of the sealing bracket 51 of the packing assembly 5, the packing assembly 5 is fixed to the top of the central axis assembly 6, the central axis assembly 6 passes through the valve body 8 and is connected to the steel ball 15, the steel ball 15 is arranged in the valve body 8, and a channel is opened in the middle of the steel ball 15 for medium transmission. One end of the valve body 8 is connected to the valve cover 11 by a plurality of hexagon socket bolts 13, which are six in this embodiment, wherein the handle assembly is used to provide operation. The torque required for operating the ball valve is driven by rotating the handle to drive the central axis assembly 6 and the steel ball 15 to rotate together, controlling the exposed area of ​​the channel on the steel ball 15 to control the opening and closing of the ball valve; the positioning piece 4 and the limit bolt 7 cooperate to limit the switching angle of the ball valve; the packing assembly 5 is used to enhance the sealing performance of the central axis assembly 6 to prevent medium leakage; the central axis assembly 6 is used to connect the handle assembly and the steel ball 15 to transmit the operating torque to the steel ball 15; the valve body 8 accommodates the steel ball 15 and the soft valve seat 16 to provide a channel for the flow of the medium; the valve cover 11 is connected to the valve body 8 to provide additional sealing and protection to ensure the overall performance of the ball valve; the steel ball 15 serves as the opening and closing part of the ball valve, and controls the cutting off or flow of the medium by rotation.

[0032] The valve body 8 and the valve cover 11 are connected by hexagon socket bolts 13 instead of an integral threaded connection. The bolted connection is almost unaffected by low temperature, has better sealing performance, and avoids the thermal expansion and contraction effect in an ultra-low temperature environment, which causes the overall threaded connection to be affected, thereby causing leakage; in addition, the valve body 8 and the valve cover 11 are connected at the connection point with an overall large threaded connection, and the threads are easily bitten by each other. Dispersing them into six small-sized hexagon socket bolts 13 can effectively prevent biting, and is more convenient to disassemble and assemble, with shorter maintenance time and lower cost.

[0033] Specifically, if Figure 1 and Figure 2 As shown, the handle assembly includes a handle rubber sleeve 1, a steel pipe handle 2 and a handle connecting block 3, the central axis assembly 6 includes an extended valve stem 61, a rod sleeve 62 and a base frame 63, the handle rubber sleeve 1 is installed at both ends of the steel pipe handle 2, the steel pipe handle 2 is fixedly connected to the handle connecting block 3, the handle connecting block 3 is fixedly connected to the top of the extended valve stem 61, the bottom end of the extended valve stem 61 passes through the valve body 8 and is connected to the steel ball 15, the rod sleeve 62 is fixed to the outside of the extended valve stem 61, the top of the rod sleeve 62 is fixedly connected to the packing assembly 5, the bottom end of the rod sleeve 62 is fixedly connected to the base frame 63, the base frame 63 is fixedly connected to the valve body 8, and a sealing ring 9 is provided at the connection between the base frame 63 and the valve body 8. The handle rubber sleeve 1 increases the grip comfort and anti-slip performance of the handle, protects the operator's hands from low temperature or mechanical damage, and provides a stable grip; the handle connecting block 3 connects the handle assembly and the central axis assembly 6 to transmit the operating torque; the extended valve stem 61 connects the handle assembly and the steel ball 15 to transmit the operating torque, and raises the height of the packing assembly 5, which meets the height design requirements of the BS6364 standard, keeps the packing assembly 5 away from the low temperature zone, ensures that the valve stem packing 52 is used at normal temperature, ensures the sealing performance of the valve stem packing 52, extends the service life of the valve stem packing 52, and also prevents the operator from frostbite due to too low temperature; the base frame 63 provides connection and support between the central axis assembly 6 and the valve body 8; the sealing ring 9 improves the sealing between the central axis assembly 6 and the valve body 8 to prevent medium leakage.

[0034] Specifically, if Figure 1-Figure 3As shown, the packing assembly 5 includes a sealing bracket 51, a valve stem packing 52, a low-temperature O-ring 53, a glam 54, a disc-shaped spring piece 55 and a fastening bolt 56. The sealing bracket 51 is fixedly installed on the top of the rod sleeve 62. There are multiple valve stem packings 52. Multiple valve stem packings 52, low-temperature O-rings 53, glam 54, disc-shaped spring pieces 55 and fastening bolts 56 are all arranged in the sealing bracket 51 and installed on the central shaft assembly 6. The low-temperature O-ring 53 is arranged below the multiple valve stem packings 52, the glam 54 is located above the multiple valve stem packings 52, the disc-shaped spring piece 55 is located above the glam 54, and the fastening bolt 56 is arranged above the disc-shaped spring piece 55. The sealing bracket 51 is used to support and fix other components in the packing assembly 5; the valve stem packing 52 is used to improve the sealing performance and prevent medium leakage; the low-temperature O-ring 53 is used for secondary sealing; the grommet 54 is used to support and fix the valve stem packing 52 to prevent it from loosening or falling off; the disc-shaped spring piece 55 provides additional elastic force compensation, which is adjusted by the tightening bolt 56 and deformed to generate elastic force, so that the packing assembly 5 and the central shaft assembly 6 maintain a close contact state, ensuring the sealing performance of the packing assembly 5.

[0035] In order to keep the heat and cold evenly for a long time, an insulation jacket 12 and a jacket flange 10 are also provided. The insulation jacket 12 is a cylindrical structure and is installed in the middle of the valve body 8. The jacket flange 10 is fixedly installed on both sides of the insulation jacket 12. The jacket flange 10 is used to fix the insulation jacket 12. By extracting the air in the insulation jacket 12 to maintain a vacuum environment, or adding a cold insulation medium in the insulation jacket 12, the stability and insulation performance of the insulation jacket 12 are ensured, the low temperature state of the medium during the transportation process is maintained, and the overall efficiency of the system is improved. A sewage discharge component 14 is provided at the bottom of the insulation jacket 12. The sewage discharge component 14 includes a sewage outlet 141 and a sewage plug 142. The sewage plug 142 cooperates with the sewage outlet 141 to regularly discharge the deposits formed between the valve body 8 and the jacket flange 10 to avoid affecting the cold insulation effect of the insulation jacket 12.

[0036] In order to improve the sealing performance and extend the service life, such as Figure 4 As shown, two soft valve seats 16 are provided in the valve body 8, and the two soft valve seats 16 are located on both sides of the steel ball 15. An elastic compensation component 17 is provided on one side of the inner cavity of the valve cover 11, and the elastic compensation component 17 abuts against one of the soft valve seats 16 to pre-tighten and compensate the soft valve seat 16 to improve the sealing performance. The elastic compensation component 17 includes a valve seat pressure ring 171 and a disc spring 172. The valve seat pressure ring 171 abuts against the soft valve seat 16, and the disc spring 172 is located between the valve seat pressure ring 171 and the inner cavity of the valve cover 11. The disc spring 172 deforms to generate elastic force that acts evenly on the soft valve seat 16 through the valve seat pressure ring 171, so that the soft valve seat 16 and the steel ball 15 maintain a close contact state, thereby improving the sealing performance.

[0037] The operating principle of the present utility model is as follows.

[0038] The operator controls the opening and closing of the ball valve by rotating the handle assembly. The handle assembly, the central axis assembly 6 and the steel ball 15 are connected in sequence. The handle assembly provides sufficient torque to enable the steel ball 15 to rotate in the valve body 8, thereby controlling the flow of the medium. After rotating to the switch position, the limit bolt 7 contacts the positioning plate 4, preventing the handle assembly from continuing to rotate, ensuring that the ball valve does not rotate excessively during the opening and closing process, thereby avoiding the problem of inaccurate limiting caused by excessive rotation. At the same time, the design of the positioning plate 4 enables it to generate a clear feedback signal when it contacts the limit bolt 7, telling the operator when the ball valve rotates to the predetermined position. When the ball valve is working, the packing assembly 5 ensures the seal between the central axis assembly 6 and the valve body 8 through the combination of valve stem packing 52, low-temperature O-ring 53, Glam 54, disc spring 55 and fastening bolt 56 to prevent leakage of the medium; the elastic compensation assembly 17 pre-tightens and compensates the two soft valve seats 16 set in the valve body 8 through the valve seat pressure ring 171 and the disc spring 172, ensuring that the soft valve seat 16 and the steel ball 15 always maintain a close contact state, further enhancing the sealing effect of the ball valve; the air in the insulation jacket 12 is extracted to form a vacuum environment, or a low-temperature medium is added, thereby effectively reducing energy loss and the rise in medium temperature. In addition, the sewage group head is opened regularly to discharge the deposits inside the valve body 8 and the insulation jacket 12 to avoid affecting the cold insulation effect.

[0039] The above describes an embodiment of the present invention in detail. However, the above content is only a preferred embodiment of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent application of the present invention.

Claims

1. A cryogenic jacketed ball valve, comprising a handle assembly, a central axis assembly (6), a valve body (8), a valve cover (11) and a steel ball (15), wherein the handle assembly is fixedly connected to the top of the central axis assembly (6), the central axis assembly (6) is connected to the steel ball (15), the steel ball (15) is arranged in the valve body (8), and one end of the valve body (8) is connected to the valve cover (11), characterized in that: Also includes: A packing assembly (5), the packing assembly (5) comprising a sealing bracket (51), a valve stem packing (52) and a low-temperature O-ring (53), the sealing bracket (51) being fixedly mounted on the top of the central shaft assembly (6), a plurality of valve stem packings (52) being provided, the plurality of valve stem packings (52) and the low-temperature O-ring (53) being arranged in the sealing bracket (51) and mounted on the central shaft assembly (6), the low-temperature O-ring (53) being arranged below the plurality of valve stem packings (52), A heat-insulating jacket (12) and a jacket flange (10), wherein the heat-insulating jacket (12) is mounted on the valve body (8), and the jacket flange (10) is fixedly mounted on both sides of the heat-insulating jacket (12).

2. The ultra-low temperature jacketed ball valve according to claim 1, characterized in that: The handle assembly comprises a handle rubber sleeve (1), a steel tube handle (2) and a handle connecting block (3); the handle rubber sleeve (1) is mounted on both ends of the steel tube handle (2); the steel tube handle (2) is fixedly connected to the handle connecting block (3); and the handle connecting block (3) is fixedly connected to the top of the central axis assembly (6).

3. The ultra-low temperature jacketed ball valve according to claim 1 or 2, characterized in that: It also includes a positioning piece (4) and a limiting bolt (7), wherein the positioning piece (4) is fixed to the bottom of the handle assembly, and the limiting bolt (7) is fixed to a corner of the top of the filler assembly (5).

4. The ultra-low temperature jacketed ball valve according to claim 1, characterized in that: The central axis assembly (6) comprises an extended valve stem (61), a rod sleeve (62) and a base frame (63); the top end of the extended valve stem (61) is fixedly connected to the handle assembly; the bottom end of the extended valve stem (61) passes through the valve body (8) and is connected to the steel ball (15); the rod sleeve (62) is fixed to the outside of the extended valve stem (61); the top end of the rod sleeve (62) is fixedly connected to the packing assembly (5); the bottom end of the rod sleeve (62) is fixedly connected to the base frame (63); the base frame (63) is fixedly connected to the valve body (8); and a sealing ring (9) is provided at the connection between the base frame (63) and the valve body (8).

5. The ultra-low temperature jacketed ball valve according to claim 1, characterized in that: The packing assembly (5) further comprises a glam (54), which is arranged in the sealing bracket (51) and mounted on the central shaft assembly (6), and the glam (54) is located above the plurality of valve stem packings (52).

6. The ultra-low temperature jacketed ball valve according to claim 5, characterized in that: The packing assembly (5) further comprises a fastening bolt (56) and a disc-shaped spring piece (55), wherein the fastening bolt (56) and the disc-shaped spring piece (55) are arranged in the sealing bracket (51) and mounted on the central shaft assembly (6), wherein the disc-shaped spring piece (55) is located above the grommet (54), and the fastening bolt (56) is located above the disc-shaped spring piece (55).

7. The ultra-low temperature jacketed ball valve according to claim 1, characterized in that: One end of the valve body (8) is connected to the valve cover (11) via a plurality of hexagon socket bolts (13).

8. The ultra-low temperature jacketed ball valve according to claim 1, characterized in that: A sewage discharge assembly (14) is provided at the bottom of the heat-insulating jacket (12). The sewage discharge assembly (14) comprises a sewage discharge port (141) and a sewage discharge plug (142). The sewage discharge plug (142) cooperates with the sewage discharge port (141).

9. The ultra-low temperature jacketed ball valve according to claim 1, characterized in that: Two soft valve seats (16) are provided in the valve body (8), and the two soft valve seats (16) are located on both sides of the steel ball (15). An elastic force compensation component (17) is provided on one side of the inner cavity of the valve cover (11), and the elastic force compensation component (17) abuts against one of the soft valve seats (16).

10. The ultra-low temperature jacketed ball valve according to claim 9, characterized in that: The elastic force compensation component (17) includes a valve seat pressing ring (171) and a disc spring (172), wherein the valve seat pressing ring (171) abuts against the soft valve seat (16), and the disc spring (172) is located between the valve seat pressing ring (171) and the inner cavity of the valve cover (11).

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