A fixed cryogenic ball valve

Abstract

This utility model discloses a fixed cryogenic ball valve, relating to the field of ball valves. The device includes a cryogenic ball valve body, with a long-neck valve stem assembly mounted on its upper end. An outer protective cylinder is mounted outside the long-neck valve stem assembly, comprising an outer cylinder and an inner cylinder. The inner cylinder includes an inner metal shell, which is installed outside the long-neck valve stem assembly, forming a first air-isolated cavity between the inner metal shell and the long-neck valve stem assembly. The outer cylinder includes a rainproof rubber cover, which is fitted over the inner metal shell, forming a second air-isolated cavity between the rainproof rubber cover and the inner metal shell. This device prevents moisture or other liquids from entering the valve stem and, through a multi-layered structure, isolates the internal and external temperatures, enhancing the valve stem's heat insulation and physical protection. Furthermore, the modular design allows for easy disassembly and replacement of the outer protective cylinder.

Description

Technical Field

[0001] This utility model relates to the field of ball valves, and in particular to a fixed cryogenic ball valve. Background Technology

[0002] Fixed cryogenic ball valves are valves specifically designed for cryogenic media. The ball is rigidly connected to the valve body via upper and lower valve stems, and the valve seat adopts a floating design to achieve bidirectional sealing by pressing the sealing ring with the medium pressure or spring force. The applicable temperature range is typically -40℃ to -196℃. The long-neck valve cover design can prevent the packing from freezing. They are widely used in cryogenic fluid systems such as liquefied natural gas, liquid oxygen, and liquid nitrogen, in fields such as petrochemicals, liquefied natural gas storage and transportation, power, pharmaceuticals, and aerospace.

[0003] On the long neck stem of existing cryogenic ball valves, water vapor in the air or raindrops falling on the stem easily condense into an ice shell, which over time forms an ice layer. Although this ice layer does not directly enter the valve interior and affect operation, its formation and expansion can damage the insulation layer and accelerate corrosion of the valve cover material. Existing insulation layers are simply a single layer of insulation material on the outside, such as foam glass. This material becomes brittle and loses its insulation effect over time, and may even partially detach, failing to form a protective layer on the outside of the valve stem, thus leading to the aforementioned problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a fixed cryogenic ball valve. This solves the problem of existing cryogenic ball valves where water vapor in the air or raindrops falling on the valve stem easily condenses into an ice shell, eventually forming an ice layer. While this ice layer doesn't directly enter the valve and affect operation, its formation and expansion can damage the insulation layer and exacerbate corrosion of the valve cover material. Existing insulation layers are simply a single layer of insulation material, such as foam glass, on the outside. This material becomes brittle and loses its insulation effect over time, and may even partially detach, failing to form an insulating layer on the outside of the valve stem, thus leading to the aforementioned problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fixed cryogenic ball valve, comprising a cryogenic ball valve body, a long-neck valve stem assembly mounted on the upper end of the cryogenic ball valve body, an outer protective cylinder mounted on the outside of the long-neck valve stem assembly, the outer protective cylinder comprising an outer cylinder and an inner cylinder, wherein the inner cylinder comprises an inner metal shell, the inner metal shell is mounted on the outside of the long-neck valve stem assembly, a first air-isolated cavity is formed between the inner metal shell and the long-neck valve stem assembly, the outer cylinder comprises a rainproof rubber cover, the rainproof rubber cover is sleeved on the outside of the inner metal shell, a second air-isolated cavity is formed between the rainproof rubber cover and the inner metal shell.

[0006] Preferably, the long-neck valve stem assembly includes a long valve stem and a connecting fixing plate. The inner metal cylinder shell is installed outside the long valve stem, and the connecting fixing plate is installed at the upper end of the long valve stem. The connecting fixing plate is used to fix the outer cylinder and the inner cylinder to the outer end of the long valve stem. A lower connecting seat is fixedly connected to the bottom end of the long valve stem, and a valve stem fixing rod is fixedly connected to the bottom end of the long valve stem.

[0007] Preferably, the inner cylinder includes a connecting base and an upper insertion rod. The connecting base is fixedly connected to the bottom end of the inner metal shell, and the upper insertion rod is fixedly connected to the top end of the inner metal shell. An insertion hole is provided in the connecting base, and the upper insertion rod is movably inserted into the inner insertion hole. The insertion hole has two sets, inner and outer. A threaded groove is provided at the top end of the upper insertion rod, and it is threadedly fixed in the connecting base by a nut. The connecting base is mounted on the lower connecting seat, and the valve stem fixing rod is movably inserted into the outer insertion hole.

[0008] Preferably, the outer cylinder includes an upper connecting ring, a lower connecting ring, and a lower fixing post. The upper connecting ring is fixedly connected to the upper end of the rainproof and insulating rubber cover, the lower connecting ring is fixedly connected to the lower end of the rainproof and insulating rubber cover, and the lower fixing post is fixedly connected to the bottom end of the lower connecting ring. The lower fixing post is movably inserted into the connecting fixing plate. The connecting fixing plate includes a fixed lower clamping plate, and the upper connecting ring is movably engaged between the fixed lower clamping plate and the connecting fixing plate.

[0009] Preferably, the top of the cryogenic ball valve body is fixedly connected to an upper connecting flange, the long neck valve stem assembly includes a flange base, the flange base is fixedly connected to the bottom of the lower connecting seat, and the flange base and the upper connecting flange are sealed together.

[0010] Preferably, the long-neck valve stem assembly further includes an upper sealing connector and a rotating valve disc. The connecting and fixing disc further includes a fixing disc connecting column. The upper sealing connector is installed on the fixing disc connecting column. A stuffing box is provided inside the upper sealing connector. The rotating valve disc is rotatably connected to the upper sealing connector. A rotating inner rod is connected to the bottom end of the rotating valve disc. The rotating inner rod passes through the stuffing box and enters the cryogenic ball valve body to drive the ball valve to open or close.

[0011] The technical effects and advantages of this utility model are as follows:

[0012] This type of fixed cryogenic ball valve, through the setting of an outer protective cylinder and the combination of an air layer, a metal layer, an air layer, and a rubber insulating layer, prevents water vapor or other liquids from entering the valve stem. The multi-layer structure also prevents the temperature inside the valve stem from being transferred to the outermost rubber layer, and prevents the external temperature from being transferred to the valve stem. This not only enhances the heat insulation effect of the valve stem but also increases its physical protection. At the same time, the modular design makes the outer protective cylinder easy to disassemble and replace. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall front structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the overall exploded structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the partial explosion structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the outer protective cylinder of this utility model;

[0018] Figure 5 This is a schematic diagram of the explosion structure of the outer protective cylinder of this utility model.

[0019] In the diagram: 1. Low-temperature ball valve body; 11. Upper connecting flange; 2. Long neck valve stem assembly; 21. Long valve stem; 211. Lower connecting seat; 212. Valve stem fixing rod; 22. Flange base; 23. Connecting fixing plate; 231. Fixing plate connecting column; 232. Fixed lower clamping plate; 233. Insertion hole; 24. Upper sealing connector; 25. Rotating valve disc; 3. Outer protective cylinder; 31. Outer cylinder; 311. Rainproof and insulating rubber cover; 312. Upper connecting ring; 313. Lower connecting ring; 314. Lower fixing column; 32. Inner cylinder; 321. Inner metal shell; 322. Connecting base; 323. First air isolation chamber; 324. Upper insertion rod; 33. Second air isolation chamber. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0022] This utility model discloses a fixed cryogenic ball valve, according to the attached... Figures 1 to 3As shown, the device includes a cryogenic ball valve body 1, a long-neck valve stem assembly 2 mounted on the upper end of the cryogenic ball valve body 1, and an outer protective cylinder 3 mounted on the outside of the long-neck valve stem assembly 2. The outer protective cylinder 3 includes an outer cylinder 31 and an inner cylinder 32. The inner cylinder 32 includes an inner metal shell 321, which is installed on the outside of the long-neck valve stem assembly 2. A first air isolation cavity 323 is formed between the inner metal shell 321 and the long-neck valve stem assembly 2. The outer cylinder 31 includes a rainproof rubber cover 311, which is fitted on the outside of the inner metal shell 321. The rainproof rubber cover 311 is used to isolate the external environment. A second air isolation cavity 33 is formed between the rainproof rubber cover 311 and the inner metal shell 321. Both the first air isolation cavity 323 and the second air isolation cavity 33 serve as thermal insulation media.

[0023] According to the appendix Figures 1 to 3 As shown, the long-neck valve stem assembly 2 further includes a long valve stem 21 and a connecting fixing plate 23. The inner metal shell 321 is installed outside the long valve stem 21, and the connecting fixing plate 23 is installed on the upper end of the long valve stem 21. The connecting fixing plate 23 is used to fix the outer cylinder 31 and the inner cylinder 32 to the outer end of the long valve stem 21. A lower connecting seat 211 is fixedly connected to the bottom end of the long valve stem 21, and a valve stem fixing rod 212 is fixedly connected to the bottom end of the long valve stem 21.

[0024] According to the appendix Figures 3 to 5 As shown, the inner cylinder 32 further includes a connecting base 322 and an upper insertion rod 324. The connecting base 322 is fixedly connected to the bottom end of the inner metal shell 321, and the upper insertion rod 324 is fixedly connected to the top end of the inner metal shell 321. An insertion hole 233 is provided in the connecting fixing plate 23. The upper insertion rod 324 is movably inserted into the inner insertion hole 233. The insertion hole 233 is provided with two sets, inner and outer. A threaded groove is provided at the top end of the upper insertion rod 324, and it is fixed in the connecting fixing plate 23 by a nut. The connecting base 322 is installed on the lower connecting seat 211, and the valve stem fixing rod 212 is movably inserted into the outer insertion hole 233.

[0025] According to the appendix Figures 3 to 5 As shown, the outer cylinder 31 includes an upper connecting ring 312, a lower connecting ring 313, and a lower fixing post 314. The upper connecting ring 312 is fixedly connected to the upper end of the rainproof and insulating rubber cover 311, the lower connecting ring 313 is fixedly connected to the lower end of the rainproof and insulating rubber cover 311, and the lower fixing post 314 is fixedly connected to the bottom end of the lower connecting ring 313. The lower fixing post 314 is movably inserted into the connecting fixing plate 23. The connecting fixing plate 23 includes a fixed lower clamping plate 232, and the upper connecting ring 312 is movably engaged between the fixed lower clamping plate 232 and the connecting fixing plate 23.

[0026] According to the appendix Figures 1 to 3As shown, the cryogenic ball valve body 1 is specifically disclosed to have an upper connecting flange 11 fixedly connected to its top end, and the long neck valve stem assembly 2 includes a flange base 22, which is fixedly connected to the bottom end of the lower connecting seat 211. The flange base 22 and the upper connecting flange 11 are connected in a flange sealing connection.

[0027] According to the appendix Figures 2 to 5 As shown, it is particularly important to emphasize that the long neck valve stem assembly 2 also includes an upper sealing connector 24 and a rotating valve disc 25. The connecting fixed disc 23 also includes a fixed disc connecting column 231. The upper sealing connector 24 is installed on the fixed disc connecting column 231. A stuffing box is provided inside the upper sealing connector 24. The rotating valve disc 25 is rotatably connected to the upper sealing connector 24. A rotating inner rod is connected to the bottom end of the rotating valve disc 25. The rotating inner rod passes through the stuffing box and enters the cryogenic ball valve body 1 to drive the ball valve to open or close.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fixed cryogenic ball valve, comprising a cryogenic ball valve body (1), wherein a long-neck valve stem assembly (2) is mounted on the upper end of the cryogenic ball valve body (1), characterized in that, The long neck valve stem assembly (2) is externally fitted with an outer protective cylinder (3), which includes an outer cylinder (31) and an inner cylinder (32); The inner cylinder (32) includes an inner metal shell (321), which is installed on the outside of the long neck valve stem assembly (2). A first air isolation cavity (323) is formed between the inner metal shell (321) and the long neck valve stem assembly (2). The outer cylinder (31) includes a rainproof rubber cover (311), which is fitted on the outside of the inner metal shell (321). The rainproof rubber cover (311) is used to isolate the external environment. A second air isolation cavity (33) is formed between the rainproof rubber cover (311) and the inner metal shell (321). Both the first air isolation cavity (323) and the second air isolation cavity (33) serve as heat insulation media.

2. A fixed cryogenic ball valve according to claim 1, characterized in that, The long-neck valve stem assembly (2) includes a long valve stem (21) and a connecting fixing plate (23). The inner metal cylinder shell (321) is installed outside the long valve stem (21). The connecting fixing plate (23) is installed on the upper end of the long valve stem (21). The connecting fixing plate (23) is used to fix the outer cylinder (31) and the inner cylinder (32) to the outer end of the long valve stem (21). The bottom end of the long valve stem (21) is fixedly connected to a lower connecting seat (211). The bottom end of the long valve stem (21) is fixedly connected to a valve stem fixing rod (212).

3. A fixed cryogenic ball valve according to claim 2, characterized in that, The inner cylinder (32) includes a connecting base (322) and an upper insertion rod (324). The connecting base (322) is fixedly connected to the bottom end of the inner metal shell (321), and the upper insertion rod (324) is fixedly connected to the top end of the inner metal shell (321). The connecting fixing plate (23) has an insertion hole (233) inside. The upper insertion rod (324) is movably inserted into the inner insertion hole (233). The insertion hole (233) is provided with two sets, inner and outer. The top end of the upper insertion rod (324) has a threaded groove and is fixed in the connecting fixing plate (23) by a nut. The connecting base (322) is installed on the lower connecting seat (211), and the valve stem fixing rod (212) is movably inserted into the outer insertion hole (233).

4. A fixed cryogenic ball valve according to claim 3, characterized in that, The outer cylinder (31) includes an upper connecting ring (312), a lower connecting ring (313), and a lower fixing post (314). The upper connecting ring (312) is fixedly connected to the upper end of the rainproof and insulating rubber cover (311). The lower connecting ring (313) is fixedly connected to the lower end of the rainproof and insulating rubber cover (311). The lower fixing post (314) is fixedly connected to the bottom end of the lower connecting ring (313). The lower fixing post (314) is movably inserted into the connecting fixing plate (23). The connecting fixing plate (23) includes a fixed lower clamping plate (232). The upper connecting ring (312) is movably engaged between the fixed lower clamping plate (232) and the connecting fixing plate (23).

5. A fixed cryogenic ball valve according to claim 2, characterized in that, The top of the cryogenic ball valve body (1) is fixedly connected to an upper connecting flange (11), and the long neck valve stem assembly (2) includes a flange base (22). The flange base (22) is fixedly connected to the bottom of the lower connecting seat (211), and the flange base (22) and the upper connecting flange (11) are connected in a flange seal.

6. A fixed cryogenic ball valve according to claim 2, characterized in that, The long neck valve stem assembly (2) also includes an upper sealing connector (24) and a rotating valve disc (25). The connecting fixing disc (23) also includes a fixing disc connecting column (231). The upper sealing connector (24) is installed on the fixing disc connecting column (231). A stuffing box is provided inside the upper sealing connector (24). The rotating valve disc (25) is rotatably connected to the upper sealing connector (24). A rotating inner rod is connected to the bottom end of the rotating valve disc (25). The rotating inner rod passes through the stuffing box and enters the cryogenic ball valve body (1) to drive the ball valve to open or close.

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