Stop valve for ultralow-temperature liquid hydrogen

Abstract

The utility model discloses a stop valve for ultralow-temperature liquid hydrogen, which relates to the technical field of liquid hydrogen stop valves and comprises a liquid hydrogen pipe mechanism, a guide mechanism is fixed at the upper end of the liquid hydrogen pipe mechanism through a screw, and a rotation locking mechanism is rotatably arranged in the guide mechanism. According to the ultralow-temperature stop valve, the problems that a valve rod of an existing ultralow-temperature stop valve is likely to have the cold brittleness phenomenon due to the low-temperature environment, and low-temperature liquid leakage is possibly caused by mistaken touch are solved, the rotary positioning block and the rotary locking mechanism are arranged in a matched mode, when the valve rod rotates till the liquid hydrogen pipe mechanism is blocked, the hand is retracted, the annular cover descends, and the liquid hydrogen pipe mechanism is locked. At the moment, the reset function of the reset spring drives the positioning sliding block to be inserted into the clamping groove, at the moment, the rotating locking mechanism cannot rotate, stop locking is achieved, through the application and arrangement of the nickel base alloy material, the used nickel base alloy has excellent corrosion resistance and low-temperature performance, the ultralow-temperature stop valve is suitable for working at the extremely low temperature, and the service life of the ultralow-temperature stop valve is prolonged. And the cold brittleness phenomenon of the rotary locking mechanism is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid hydrogen stop valves, and particularly relates to a stop valve for ultra-low temperature liquid hydrogen. Background Technique

[0002] Ultra-low temperature stop valves are valves that mainly play a control and regulation role in ultra-low temperature liquids such as liquid oxygen, liquid nitrogen, liquid argon, and liquid hydrogen. They are widely used in fields such as aerospace, scientific research, medical treatment, and electronics. Compared with ordinary stop valves, higher requirements are imposed on material selection, sealing structure, and cold resistance. Materials are usually selected from high-quality stainless steel, copper alloy, aluminum alloy, titanium alloy, graphite, etc. that have been specially treated, enabling ultra-low temperature stop valves to maintain high strength, high toughness, and high corrosion resistance in extremely low temperature environments.

[0003] However, ultra-low temperature stop valves mostly handle liquids with relatively low cut-off temperatures during operation. Therefore, after long-term use, due to the relatively low temperature environment, the valve stem may exhibit cold brittleness. At the same time, the cold brittleness also makes the metal more prone to corrosion, thus affecting the service life of the ultra-low temperature stop valve, further reducing the working efficiency of the ultra-low temperature stop valve. Moreover, after the traditional ultra-low temperature stop valve is closed by turning the handle, it is possible for the staff to accidentally touch the handle and cause the handle to rotate, which may lead to safety accidents such as leakage of low-temperature liquids.

[0004] In view of the above problems, a stop valve for ultra-low temperature liquid hydrogen is proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide a stop valve for ultra-low temperature liquid hydrogen, which solves the problems in the background technique that the existing ultra-low temperature stop valve may cause cold brittleness of the valve stem due to the relatively low temperature environment, and after turning the handle to close the valve, it is possible for the staff to accidentally touch the handle and cause the handle to rotate, resulting in leakage of low-temperature liquids.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A stop valve for ultra-low temperature liquid hydrogen, including a liquid hydrogen pipe mechanism. The upper end of the liquid hydrogen pipe mechanism is fixed by screws with a guiding mechanism. A rotating locking mechanism is rotatably arranged in the guiding mechanism. The guiding mechanism includes a rotating positioning block. The upper end of the rotating positioning block is fixedly provided with an upper ring. A clamping groove is opened in the upper ring. The rotating locking mechanism includes a nickel-based alloy rotating ring threadedly arranged inside the rotating positioning block. The nickel-based alloy rotating ring is a component made of nickel-based alloy material. The upper end of the nickel-based alloy rotating ring is set as a rotating rod. Sliding grooves are correspondingly opened on both sides of the nickel-based alloy rotating ring for locking components. A positioning slider is slidably arranged in the sliding groove. A return spring is arranged between the positioning slider and the rotating rod. Both sides of the upper end of the positioning slider are connected with connecting rods. The upper ends of the connecting rods are connected with a ring cover.

[0007] Preferably, the liquid hydrogen pipe mechanism includes a left through pipe, and a right through pipe fixedly arranged on one side of the left through pipe. A lower through port is provided on one side of the left through pipe, and an upper through port is provided on one side of the right through pipe.

[0008] Preferably, the liquid hydrogen pipe mechanism further includes a pipe ring fixedly arranged at the upper ends of the left through pipe and the right through pipe. Through holes are provided inside the left through pipe and the right through pipe, and sealing strips are clamped in the through holes.

[0009] Preferably, the guiding mechanism includes a cover screwed to the pipe ring, guiding pipes connected to both sides of the upper end of the cover, and a rotating positioning block connected to the upper ends of the two guiding pipes.

[0010] Preferably, the rotating locking mechanism further includes a sealing block fixedly arranged at the lower end of the nickel-based alloy rotating ring.

[0011] Preferably, a threaded pipe is fixedly arranged on the nickel-based alloy rotating ring, and a sliding groove is provided at the upper end of the threaded pipe.

[0012] Preferably, an inclined groove is provided at the lower end of the positioning slider.

[0013] Preferably, the positioning slider is sleeved on the nickel-based alloy rotating ring, and the positioning slider is aligned with the sliding groove for clamping.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. For a cryogenic liquid hydrogen globe valve provided by the present utility model, through the combined setting of the rotating positioning block and the rotating locking mechanism, manually rotating the rotating rod can drive the overall rotation of the nickel-based alloy rotating ring. When holding the rotating rod by hand, the ring cover can be driven to lift, squeezing the return spring. The ring cover and the positioning slider are connected by a connecting rod, driving the positioning slider to rise along the sliding groove. At this time, the positioning slider disengages from the card slot, enabling the rotating locking mechanism to rotate. When the rotating locking mechanism rotates to block the liquid hydrogen pipe mechanism, release the hand, and the ring cover descends. At this time, the return action of the return spring drives the positioning slider to insert into the card slot, and at this time, the rotating locking mechanism cannot rotate, realizing cut-off locking, preventing the staff from accidentally touching and causing rotation, thereby solving the problem of cryogenic liquid leakage caused by the staff accidentally touching the handle and causing the handle to rotate after closing the valve by twisting the handle in the existing cryogenic globe valve.

[0016] 2. For a cryogenic liquid hydrogen globe valve provided by the present utility model, through the application of nickel-based alloy materials, the used nickel-based alloy has excellent corrosion resistance and low-temperature performance, is suitable for cryogenic globe valves operating at extremely low temperatures, and prevents the rotating locking mechanism from appearing cold embrittlement, solving the problem that the valve stem of the existing cryogenic globe valve may appear cold embrittlement due to a lower temperature environment. Brief Description of the Drawings

[0017] Figure 1 It is a schematic side view structure diagram of the whole of the present utility model;

[0018] Figure 2 It is a schematic structure diagram of the whole of the present utility model;

[0019] Figure 3 It is a schematic disassembled structure diagram of the whole of the present utility model;

[0020] Figure 4 It is a schematic disassembled structure diagram of the guiding mechanism and the rotation locking mechanism of the present utility model Figure 1 ;

[0021] Figure 5 It is a schematic disassembled structure diagram of the guiding mechanism and the rotation locking mechanism of the present utility model Figure 2 ;

[0022] Figure 6 It is of the present utility model Figure 5 schematic structure diagram at position A.

[0023] In the figure: 1. Liquid hydrogen pipe mechanism; 11. Left through pipe; 111. Lower through port; 12. Right through pipe; 121. Upper through port; 13. Pipe ring; 14. Through hole; 15. Sealing strip; 2. Guiding mechanism; 21. Sealing cover; 22. Guiding pipe; 23. Rotating positioning block; 231. Upper ring; 232. Card slot; 3. Rotation locking mechanism; 31. Nickel-based alloy rotating ring; 311. Threaded pipe; 312. Slide groove; 313. Rotating rod; 32. Locking assembly; 321. Positioning slider; 3211. Inclined groove; 322. Connecting rod; 323. Ring cover; 33. Sealing block; 34. Return spring. Detailed Description of the Preferred Embodiment

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] To further understand the content of the present utility model, the present utility model will be described in detail in conjunction with the accompanying drawings.

[0026] In conjunction with Figure 1, a globe valve for ultra-low temperature liquid hydrogen of the present utility model includes a liquid hydrogen pipe mechanism 1. A guiding mechanism 2 is fixed to the upper end of the liquid hydrogen pipe mechanism 1 by screws. A rotating locking mechanism 3 is rotatably arranged in the guiding mechanism 2. The guiding mechanism 2 includes a rotating positioning block 23. An upper ring 231 is fixedly arranged at the upper end of the rotating positioning block 23. A clamping groove 232 is formed in the upper ring 231. The rotating locking mechanism 3 includes a nickel-based alloy rotating ring 31 threadedly arranged inside the rotating positioning block 23. The nickel-based alloy rotating ring 31 is a component made of nickel-based alloy material. The upper end of the nickel-based alloy rotating ring 31 is set as a rotating rod 313. Sliding grooves 312 are formed on both sides of the nickel-based alloy rotating ring 31 corresponding to the locking components 32. A positioning slider 321 is slidably arranged in the sliding grooves 312. A return spring 34 is arranged between the positioning slider 321 and the rotating rod 313. Connecting rods 322 are connected to both sides of the upper end of the positioning slider 321. The upper ends of the connecting rods 322 are connected to a ring cover 323.

[0027] Specifically, the rotating positioning block 23 realizes thread guiding for the nickel-based alloy rotating ring 31. The nickel-based alloy rotating ring 31 rotates and lifts along the rotating positioning block 23 to block or open the liquid hydrogen pipe mechanism 1. The clamping groove 232 formed on the upper ring 231 is used for positioning and clamping the locking components 32. The nickel-based alloy rotating ring 31 is rotatably arranged in the rotating positioning block 23. Manually rotating the rotating rod 313 can drive the overall rotation of the nickel-based alloy rotating ring 31. When holding the rotating rod 313 by hand, the ring cover 323 can be lifted, squeezing the return spring 34. The ring cover 323 and the positioning slider 321 are connected by the connecting rods 322, driving the positioning slider 321 to rise along the sliding grooves 312. At this time, the positioning slider 321 disengages from the clamping groove 232, enabling the rotating locking mechanism 3 to rotate. When the rotating locking mechanism 3 rotates to block the liquid hydrogen pipe mechanism 1, release the hand, and the ring cover 323 descends. At this time, the reset function of the return spring 34 drives the positioning slider 321 to insert into the clamping groove 232. At this time, the rotating locking mechanism 3 cannot rotate, realizing cut-off locking, preventing the staff from accidentally touching and causing rotation, thus resulting in the problem of low-temperature liquid leakage. The nickel-based alloy used for the nickel-based alloy rotating ring 31 has excellent corrosion resistance and low-temperature performance, and is suitable for ultra-low temperature globe valves working at extremely low temperatures, preventing the rotating locking mechanism 3 from appearing cold brittleness.

[0028] The present utility model will be further described below in conjunction with embodiments.

[0029] Embodiment 1:

[0030] Combined with Figures 2 - 5, the liquid hydrogen pipe mechanism 1 includes a left through pipe 11, a right through pipe 12 fixedly arranged on one side of the left through pipe 11. A lower through port 111 is provided on one side of the left through pipe 11, and an upper through port 121 is provided on one side of the right through pipe 12. The left through pipe 11 and the right through pipe 12 are fixedly connected to each other, and the lower through port 111 and the upper through port 121 are staggered up and down, so that the rotation locking mechanism 3 can control the flow thereof.

[0031] The liquid hydrogen pipe mechanism 1 further includes a pipe ring 13 fixedly arranged at the upper ends of the left through pipe 11 and the right through pipe 12. Through holes 14 are provided inside the left through pipe 11 and the right through pipe 12. A sealing strip 15 is clamped in the through holes 14. The pipe ring 13 cooperates with the guiding mechanism 2 to achieve sealing. The through holes 14 communicate the lower through port 111 and the upper through port 121, and the sealing strip 15 clamped in the through holes 14 cooperates with the rotation locking mechanism 3 to achieve liquid hydrogen sealing.

[0032] The guiding mechanism 2 includes a cover 21 connected to the pipe ring 13 by screws, guiding pipes 22 connected to both sides of the upper end of the cover 21, and a rotation positioning block 23 connected to the upper ends of the two guiding pipes 22. The cover 21 is hermetically connected to the pipe ring 13, and the guiding pipes 22 vertically support the rotation positioning block 23.

[0033] Embodiment Two:

[0034] Combined with Figures 4 - 6 , the rotation locking mechanism 3 further includes a sealing block 33 fixedly arranged at the lower end of the nickel-based alloy rotating ring 31. The sealing block 33 can contact the sealing strip 15 to achieve the path sealing of the left through pipe 11 and the right through pipe 12.

[0035] A threaded pipe 311 is fixedly arranged on the nickel-based alloy rotating ring 31. A chute 312 is provided at the upper end of the threaded pipe 311. The threaded pipe 311 is threadedly engaged in the rotation positioning block 23. The length of the threaded pipe 311 is equal to the adjustment height when the rotation locking mechanism 3 rotates. The setting that the chute 312 is provided at the upper end of the threaded pipe 311 limits the lowest height at which the locking assembly 32 is reset by the return spring 34.

[0036] An inclined groove 3211 is provided at the lower end of the positioning slider 321. The provision of the inclined groove 3211 helps the positioning slider 321 to align with the card slot 232 for locking after rotation ends.

[0037] The positioning slider 321 is sleeved on the nickel-based alloy rotating ring 31, and the positioning slider 321 is aligned with the chute 312 for engagement. The setting of this structure enables the locking assembly 32 to rotate synchronously with the nickel-based alloy rotating ring 31. When the rotating rod 313 is manually rotated, the locking assembly 32 automatically follows, and after the hand is released, the locking assembly 32 automatically resets to achieve locking.

[0038] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0039] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stop valve for ultra-low temperature liquid hydrogen, comprising a liquid hydrogen pipe mechanism (1), characterized in that: The upper end of the liquid hydrogen pipe mechanism (1) is screwed with a guide mechanism (2), and a rotation locking mechanism (3) is rotatably arranged in the guide mechanism (2); The guide mechanism (2) comprises a rotation positioning block (23), an upper ring (231) is fixedly arranged at the upper end of the rotation positioning block (23), a slot (232) is provided in the upper ring (231), the rotation locking mechanism (3) comprises a nickel-based alloy rotating ring (31) threadedly arranged inside the rotation positioning block (23), the nickel-based alloy rotating ring (31) is a component made of nickel-based alloy material, the upper end of the nickel-based alloy rotating ring (31) is arranged as a rotation rod (313), two sides of the nickel-based alloy rotating ring (31) are provided with sliding grooves (312) corresponding to the locking assembly (32), a positioning slider (321) is slidably arranged in the sliding groove (312), a return spring (34) is provided between the positioning slider (321) and the rotation rod (313), two sides of the upper end of the positioning slider (321) are connected with connecting rods (322), and the upper end of the connecting rod (322) is connected with a ring cover (323).

2. A stop valve for ultra-low temperature liquid hydrogen according to claim 1, characterized in that: The liquid hydrogen pipe mechanism (1) comprises a left through pipe (11), and a right through pipe (12) fixedly arranged on one side of the left through pipe (11); a lower through opening (111) is opened on one side of the left through pipe (11), and an upper through opening (121) is opened on one side of the right through pipe (12).

3. A stop valve for ultra-low temperature liquid hydrogen according to claim 2, characterized in that: The liquid hydrogen pipe mechanism (1) further comprises a pipe ring (13) fixedly arranged at the upper ends of the left through pipe (11) and the right through pipe (12); through holes (14) are provided inside the left through pipe (11) and the right through pipe (12); and sealing strips (15) are engaged in the through holes (14).

4. A stop valve for ultra-low temperature liquid hydrogen according to claim 3, characterized in that: The guide mechanism (2) comprises a cover (21) provided with a screw-connected pipe ring (13), guide tubes (22) connected to both sides of the upper end of the cover (21), and the rotation positioning block (23) connected to the upper ends of the two groups of guide tubes (22).

5. The stop valve for ultra-low temperature liquid hydrogen according to claim 1, characterized in that: The rotation locking mechanism (3) further comprises a sealing block (33) fixedly arranged at the lower end of the nickel-based alloy rotating ring (31).

6. A stop valve for ultra-low temperature liquid hydrogen according to claim 1, characterized in that: A threaded tube (311) is fixedly arranged on the nickel-based alloy rotating ring (31), and the sliding groove (312) is opened at the upper end of the threaded tube (311).

7. The stop valve for ultra-low temperature liquid hydrogen according to claim 1, characterized in that: The lower end of the positioning slide block (321) is provided with an inclined groove (3211).

8. The stop valve for ultra-low temperature liquid hydrogen according to claim 1, characterized in that: The positioning slide block (321) is sleeved on the nickel-based alloy rotating ring (31), and the positioning slide block (321) is aligned with the slide groove (312) for engagement.

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