Vacuum male and female joint for liquid helium and liquid hydrogen valve and mounting process thereof

Abstract

This invention discloses a vacuum male and female connector for liquid helium and liquid hydrogen valves and its installation process. The connector includes a vacuum male connector and a vacuum female connector. The vacuum male connector comprises an outer tube, an inner tube, and a bellows. The inner tube and the bellows are connected. One end of the outer tube has a male flange, and the other end has a male fitting sleeve. The vacuum female connector comprises an outer tube, an inner tube, and a bellows. A female fitting sleeve is located between the inner tube and the bellows. One end of the outer tube has a female flange, the inner edge of which connects to the outer circle of the inner tube. The male and female flanges are detachably connected. This invention facilitates assembly and production, and is less prone to cracking due to thermal expansion and contraction under temperature changes and uneven stress. It has the advantages of structural stability, reliability, and good sealing performance.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically to a vacuum male and female connector for a liquid helium-liquid hydrogen valve and its installation process. Background Technology

[0002] Insulated valves possess excellent heat and cold insulation properties, and their valve diameter matches the pipe diameter, while effectively reducing heat loss of the medium in the pipeline. Insulated valves are widely used in various systems such as petroleum, chemical, metallurgy, and pharmaceutical industries, effectively reducing heat loss of the medium in the pipeline and preventing phenomena such as crystallization and solidification.

[0003] Cryogenic valves are valves that can be used in low-temperature conditions. Valves with an operating temperature below -40°C are usually called cryogenic valves. Cryogenic valves are commonly used for the opening and closing control of cryogenic fluids such as liquid hydrogen, liquid helium, liquid oxygen, and liquid argon. The quality of the valve is directly related to the safety of transporting cryogenic fluids.

[0004] Due to the high sealing requirements, the vacuum jacket of the liquid helium and liquid hydrogen cryogenic valve is very troublesome to connect and install. Furthermore, the thin vacuum jacket is prone to cracking due to thermal expansion and contraction and uneven stress under temperature changes, which can damage the vacuum system. Summary of the Invention

[0005] The purpose of this invention is to provide a vacuum male and female connector for liquid helium and liquid hydrogen valves and its installation process. This invention is easy to assemble and produce, and is not prone to cracking due to thermal expansion and contraction under temperature changes and uneven stress. It has the advantages of stable and reliable structure and good sealing performance.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a vacuum male and female connector for a liquid helium-liquid hydrogen valve, used for installation at both ends of the vacuum jacket of the liquid helium-liquid hydrogen valve and connected to the inner tube of the liquid helium-liquid hydrogen valve, characterized in that: it includes a vacuum male connector and a vacuum female connector. The vacuum connector includes an outer tube, an inner tube, and a corrugated tube. The inner tube and the corrugated tube are connected. One end of the outer tube is provided with a male flange, and the other end is provided with a male fitting sleeve. The male fitting sleeve is installed on the outer periphery of the male flange. The vacuum female connector includes a vacuum female connector outer tube, a vacuum female connector inner tube and a vacuum female connector corrugated tube disposed inside the vacuum female connector outer tube, a female mating sleeve is provided between the vacuum female connector inner tube and the vacuum female connector corrugated tube, and the vacuum female connector inner tube is sleeved on the outer circumference of the vacuum male connector outer tube, and a female flange is provided at one end of the vacuum female connector outer tube, the inner edge of the female flange being connected to the outer circle of the vacuum female connector inner tube; The male flange and the female flange are detachably connected together, so that the male mating sleeve and the female mating sleeve abut against each other.

[0007] The present invention is further configured such that a heat-sealing assembly is sandwiched between the male flange and the female flange, and a cold-sealing assembly is sandwiched between the male fitting sleeve and the female fitting sleeve.

[0008] The present invention is further configured such that the heat sealing assembly includes a heat sealing ring and an O-ring, and the male flange near the female flange has a first groove and a second groove arranged sequentially from the inside to the outside. The heat sealing ring and the O-ring are respectively embedded in the first groove and the second groove. When the male flange and the female flange are locked together, the female flange presses the O-ring into the second groove. The female flange is also provided with a pressing protrusion for pressing the heat sealing ring into the first groove.

[0009] The present invention is further configured such that the male fitting sleeve has a first sealing groove on its outer periphery, and the female fitting sleeve has a second sealing groove on its outer periphery. The first sealing groove and the second sealing groove are combined to form a sealing cavity. The cold sealing assembly is disposed in the sealing cavity. The cold sealing assembly includes a support ring and a first PTFE retaining ring and a second PTFE retaining ring disposed at both ends of the support ring. The first PTFE retaining ring abuts against the inner end of the first sealing groove, and the second PTFE retaining ring abuts against the inner end of the second sealing groove.

[0010] The present invention is further configured such that the two ends of the support ring are respectively provided with a first annular V-groove and a second annular V-groove, the first PTFE retaining ring is provided with a first annular protrusion that fits into the first annular V-groove, the second PTFE retaining ring is provided with a second annular protrusion that fits into the second annular V-groove, the other end of the first PTFE retaining ring corresponding to the first annular protrusion is provided with a third annular V-groove, the inner end of the first sealing groove is provided with a third annular protrusion that fits into the third annular V-groove, the other end of the second PTFE retaining ring corresponding to the second annular protrusion is provided with a fourth annular V-groove, the inner end of the second sealing groove is provided with a fourth annular protrusion that fits into the fourth annular V-groove; and the positive pressure of the third annular protrusion on the first PTFE retaining ring points towards the first annular protrusion, and the positive pressure of the fourth annular protrusion on the second PTFE retaining ring points towards the second annular protrusion.

[0011] The present invention is further configured such that a loose flange is fitted around the outer periphery of the outer tube of the vacuum female connector, and the loose flange is located at the end of the female flange away from the male flange. The loose flange and the male flange are connected together by multiple bolts, so that the male flange and the female flange are tightly abutted together.

[0012] The invention is further configured such that the installation directions of each pair of connected bolts are opposite.

[0013] The present invention is further configured such that the outer periphery of the mother flange is provided with an annular positioning groove, and the inner periphery of the loose flange is provided with an annular positioning flange that matches the annular positioning groove.

[0014] The invention is further configured such that a positioning mechanism is provided between the female flange and the loose flange. The positioning mechanism includes a limiting ring and multiple positioning components. The limiting ring is threadedly connected to the annular positioning groove. The limiting ring has multiple mounting cavities, the number of which is equivalent to the number of positioning components. Each mounting cavity includes a threaded groove, a movable channel, and a limiting opening from the inside to the outside. The diameters of the threaded groove, the movable channel, and the limiting opening decrease sequentially. The positioning components are disposed in the corresponding mounting cavities. Each positioning component includes a limiting plug, a gasket, a spring, and a locking ball. The limiting plug is threadedly connected to the threaded groove. The outer end of the limiting plug has a hexagonal operating groove. The gasket is disposed at the inner end of the limiting plug. The spring and the locking ball are disposed in the movable channel, with one end of the spring abutting against the gasket and the other end of the spring abutting against the locking ball, so that the locking ball is partially exposed outside the limiting opening. The inner circumference of the annular positioning flange has a positioning recess for the locking ball to be inserted.

[0015] This invention also provides an installation process for a vacuum male and female connector for a liquid helium-liquid hydrogen valve, comprising the following steps: (a) Welding: a. Welding of the vacuum female connector: First, weld the bellows of the vacuum female connector to the inner tube of the liquid helium-liquid hydrogen valve and check for leaks at the welded area; Second, weld the outer tube of the vacuum female connector to the outer tube of the liquid helium-liquid hydrogen valve and check for leaks at the welded area; Third, fit the loose flange onto the outer tube of the vacuum female connector, with its flat end facing the liquid helium-liquid hydrogen valve; Finally, weld the female flange to both the outer and inner tubes of the vacuum female connector and check for leaks at the welded area. b. Welding of the vacuum male connector: First, remove the cold sealing assembly. Step 1: Weld the bellows of the vacuum male connector to the inner tube of the liquid helium-liquid hydrogen valve and check for leaks at the welded area. Step 2: Weld the male flange to the outer tube of the vacuum male connector and the outer tube of the liquid helium-liquid hydrogen valve respectively, and check for leaks at the welded area. Step 3: Weld the outer tube of the vacuum male connector to the inner tube of the vacuum male connector and check for leaks at the welded area. (II) Installation: Before installing the male and female connectors, first, put the removed cold sealing ring assembly onto the vacuum male connector; the second step is to install the heat sealing ring assembly, embedding the heat sealing ring into the first groove of the male flange, and simultaneously embedding the matching O-ring into the second groove; the third step is to assemble the vacuum male connector and the vacuum female connector; the fourth step is to connect the loose flange and the male flange together with multiple bolts, so that the male flange and the female flange are tightly pressed together, and the installation directions of each pair of connected bolts are opposite.

[0016] Compared with the prior art, the present invention has the following advantages: The present invention has a simple and reliable structure, is easy to assemble and produce, and has a metal vacuum jacket welded to the valve body. Both ends have vacuum male and female connectors, forming an independent vacuum system with the valve body jacket. Through the vacuum connector, a vacuum insulation layer is formed, which effectively reduces heat radiation and heat loss. The inner tube of the vacuum male and female connector is equipped with a corrugated pipe, which can prevent the thin vacuum jacket from cracking due to thermal expansion and contraction and uneven stress under temperature changes, thus preventing damage to the vacuum system. It has the advantages of stable and reliable structure and good sealing performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the vacuum male and female connector of the present invention; Figure 2 for Figure 1 Enlarged structural diagram of section A in the middle; Figure 3 for Figure 1 Enlarged structural diagram of section B in the middle; Figure 4 This is a schematic diagram of the mating structure of the loose flange and the male flange of the present invention; Figure 5 for Figure 4 Enlarged structural diagram of section C; Figure 6 This is a schematic diagram of the structure of the vacuum male and female connector of the present invention installed on a valve.

[0018] In the diagram: 1. Liquid helium / liquid hydrogen valve; 2. Vacuum jacket; 3. Vacuum male connector; 4. Vacuum female connector; 5. Vacuum male connector outer tube; 6. Vacuum male connector inner tube; 7. Vacuum male connector bellows; 8. Male flange; 9. Male mating sleeve; 10. Vacuum female connector outer tube; 11. Vacuum female connector inner tube; 12. Vacuum female connector bellows; 13. Female mating sleeve; 14. Female flange; 15. Heat sealing assembly; 16. Cold sealing assembly; 17. Heat sealing ring; 18. O-ring; 19. First groove; 20. Second groove; 21. Pressing protrusion; 22. First sealing groove; 23. Second sealing groove; 24. Sealing cavity; 25. Support ring; 26. First 27. Second PTFE retaining ring; 28. First annular V-groove; 29. ​​Second annular V-groove; 30. First annular protrusion; 31. Second annular protrusion; 32. Third annular V-groove; 33. Third annular protrusion; 34. Fourth annular V-groove; 35. Fourth annular protrusion; 36. Loose flange; 37. Annular positioning groove; 38. Annular positioning flange; 39. Positioning mechanism; 40. Limiting ring; 41. Positioning assembly; 42. Mounting cavity; 43. Threaded groove; 44. Movable channel; 45. Limiting opening; 46. Limiting plug; 47. Gasket; 48. Spring; 49. Locking ball; 50. Hexagonal operating groove; 51. Positioning recess. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example: As attached Figures 1-6 The diagram shows a vacuum male and female connector for a liquid helium-liquid hydrogen valve, used to be installed at both ends of the vacuum jacket 2 of the liquid helium-liquid hydrogen valve 1 and connected to the inner tube of the liquid helium-liquid hydrogen valve 1. It includes a vacuum male connector 3 and a vacuum female connector 4. The vacuum connector 3 includes a vacuum connector outer tube 5, a vacuum connector inner tube 6 and a vacuum connector corrugated tube 7 disposed inside the vacuum connector outer tube 5. The vacuum connector inner tube 6 and the vacuum connector corrugated tube 7 are connected. One end of the vacuum connector outer tube 5 is provided with a male flange 8, and the other end of the vacuum connector outer tube 5 is provided with a male mating sleeve 9. The male mating sleeve 9 is installed on the outer periphery of the vacuum male flange 8. The vacuum female connector 4 includes a vacuum female connector outer tube 10, a vacuum female connector inner tube 11 and a vacuum female connector corrugated tube 12 disposed inside the vacuum female connector outer tube 10, a female mating sleeve 13 is provided between the vacuum female connector inner tube 11 and the vacuum female connector corrugated tube 12, and the vacuum female connector inner tube 11 is sleeved on the outer periphery of the vacuum male connector outer tube 5. One end of the vacuum female connector outer tube 10 is provided with a female flange 14, and the inner edge of the female flange 14 is connected to the outer circle of the vacuum female connector inner tube 11. The male flange 8 and the female flange 14 are detachably connected together, so that the male mating sleeve 9 and the female mating sleeve 13 abut against each other.

[0021] As attached Figure 1 As shown, a heat-sealing assembly 15 is sandwiched between the male flange 8 and the female flange 14, and a cold-sealing assembly 16 is sandwiched between the male mating sleeve 9 and the female mating sleeve 13.

[0022] As attached Figure 2 As shown, the heat-sealing assembly 15 includes a heat-sealing ring 17 and an O-ring 18. The male flange 8, near the female flange 14, has a first groove 19 and a second groove 20 arranged sequentially from the inside to the outside. The heat-sealing ring 17 and the O-ring 18 are respectively embedded in the first groove 19 and the second groove 20. When the male flange 8 is locked to the female flange 14, the female flange 14 presses the O-ring 18 into the second groove 20. The female flange 14 is also provided with a pressing protrusion 21 for pressing the heat-sealing ring 17 into the first groove 19.

[0023] As attached Figure 3 As shown, the male fitting sleeve 9 has a first sealing groove 22 on its outer periphery, and the female fitting sleeve 13 has a second sealing groove 23 on its outer periphery. The first sealing groove 22 and the second sealing groove 23 are combined to form a sealing cavity 24. The cold sealing assembly 16 is disposed in the sealing cavity 24. The cold sealing assembly 16 includes a support ring 25 and a first PTFE retaining ring 26 and a second PTFE retaining ring 27 disposed at both ends of the support ring 25. The first PTFE retaining ring 26 abuts against the inner end of the first sealing groove 22, and the second PTFE retaining ring 27 abuts against the inner end of the second sealing groove 23.

[0024] As attached Figure 3 As shown, the support ring 25 has a first annular V-groove 28 and a second annular V-groove 29 at both ends. The first PTFE retaining ring 26 has a first annular protrusion 30 that matches the first annular V-groove 28. The second PTFE retaining ring 27 has a second annular protrusion 31 that matches the second annular V-groove 29. The other end of the first PTFE retaining ring 26 corresponding to the first annular protrusion 30 has a third annular V-groove 32. The inner end of the first sealing groove 22 has a third annular protrusion 33 that matches the third annular V-groove 32. The other end of the second PTFE retaining ring 27 corresponding to the second annular protrusion 31 has a fourth annular V-groove 34. The inner end of the second sealing groove 23 has a fourth annular protrusion 35 that matches the fourth annular V-groove 34. Furthermore, the positive pressure of the third annular protrusion 33 on the first PTFE retaining ring 26 points towards the first annular protrusion 30, and the positive pressure of the fourth annular protrusion 35 on the second PTFE retaining ring 27 points towards the second annular protrusion 31. This design greatly improves the sealing effect of the cold sealing ring assembly.

[0025] As attached Figure 1 As shown, a loose flange 36 is fitted around the outer circumference of the outer tube 10 of the vacuum female connector, and the loose flange 36 is located at the end of the female flange 14 away from the male flange 8. The loose flange 36 and the male flange 8 are connected together by multiple bolts, so that the male flange 8 and the female flange 14 are tightly abutted.

[0026] In this design, the two bolts connected to each other are installed in opposite directions. This makes the connection between the loose flange 36 and the male flange 8 more stable and has an anti-loosening effect.

[0027] As attached Figure 4 As shown, the outer circumference of the female flange 14 is provided with an annular positioning groove 37, and the inner circumference of the loose flange 36 is provided with an annular positioning flange 38 that matches the annular positioning groove 37. This design facilitates the positioning of the loose flange 36 and the female flange 14, making their fit more stable and reliable.

[0028] As attached Figure 5As shown, a positioning mechanism 39 is provided between the female flange 14 and the loose flange 36. The positioning mechanism 39 includes a limiting ring 40 and multiple positioning components 41. The limiting ring 40 is threaded onto the annular positioning groove 37. The limiting ring 40 has multiple mounting cavities 42, the number of which is equivalent to the number of positioning components 41. Each mounting cavity 42 includes a threaded groove 43, a movable channel 44, and a limiting opening 45 from the inside out. The diameters of the threaded groove 43, the movable channel 44, and the limiting opening 45 decrease sequentially. The positioning components 41 are disposed in the corresponding mounting cavities 42. The flange 1 includes a limiting plug 46, a gasket 47, a spring 48, and a locking ball 49. The limiting plug 46 is threaded into a threaded groove 43, and its outer end has a hexagonal operating groove 50. The gasket 47 is disposed at the inner end of the limiting plug 46. The spring 48 and the locking ball 49 are disposed within a movable channel 44, with one end of the spring 48 abutting against the gasket 47 and the other end abutting against the locking ball 49, so that part of the locking ball 49 protrudes outside the limiting opening 45. The inner circumference of the annular positioning flange 38 has a positioning recess 51 for the locking ball 49 to be inserted. The positioning assembly 41 pre-positions the female flange 14 and the loose flange 36, greatly facilitating the docking operation between the loose flange 36 and the male flange 8.

[0029] This invention also provides an installation process for a vacuum male and female connector for a liquid helium-liquid hydrogen valve, comprising the following steps: (a) Welding: Before welding, insulating paper is wrapped around the bellows of the vacuum female connector and the vacuum male connector.

[0030] a. Welding of the vacuum female connector: First, weld the bellows of the vacuum female connector to the inner tube of the liquid helium-liquid hydrogen valve and check for leaks at the welded area; Second, weld the outer tube of the vacuum female connector to the outer tube of the liquid helium-liquid hydrogen valve and check for leaks at the welded area; Third, fit the loose flange onto the outer tube of the vacuum female connector, with its flat end facing the liquid helium-liquid hydrogen valve; Finally, weld the female flange to both the outer and inner tubes of the vacuum female connector and check for leaks at the welded area. b. Welding of the vacuum male connector: First, remove the cold sealing assembly. Step 1: Weld the bellows of the vacuum male connector to the inner tube of the liquid helium-liquid hydrogen valve and check for leaks at the welded area. Step 2: Weld the male flange to the outer tube of the vacuum male connector and the outer tube of the liquid helium-liquid hydrogen valve respectively, and check for leaks at the welded area. Step 3: Weld the outer tube of the vacuum male connector to the inner tube of the vacuum male connector and check for leaks at the welded area. (II) Installation: Before installing the male and female connectors, first, put the removed cold sealing ring assembly onto the vacuum male connector; the second step is to install the heat sealing ring assembly, embedding the heat sealing ring into the first groove of the male flange, and simultaneously embedding the matching O-ring into the second groove; the third step is to assemble the vacuum male connector and the vacuum female connector; the fourth step is to connect the loose flange and the male flange together with multiple bolts, so that the male flange and the female flange are tightly pressed together, and the installation directions of each pair of connected bolts are opposite.

Claims

1. A vacuum male and female connector for a liquid helium-liquid hydrogen valve, used for installation at both ends of the vacuum jacket (2) of a liquid helium-liquid hydrogen valve (1) and connected to the inner tube of the liquid helium-liquid hydrogen valve (1), characterized in that: The system includes a vacuum male connector (3) and a vacuum female connector (4). The vacuum male connector (3) includes a vacuum male connector outer tube (5) and a vacuum male connector inner tube (6) and a vacuum male connector corrugated tube (7) disposed within the vacuum male connector outer tube (5). The vacuum male connector inner tube (6) and the vacuum male connector corrugated tube (7) are connected. One end of the vacuum male connector outer tube (5) is provided with a male flange (8), and the other end of the vacuum male connector outer tube (5) is provided with a male mating sleeve (9). The male mating sleeve (9) is installed on the outer periphery of the vacuum male flange (8). The vacuum female connector (4) includes a vacuum female connector outer tube (10) and a vacuum female connector inner tube (11) and a vacuum female connector corrugated tube (12) disposed within the vacuum female connector outer tube (10). A female mating sleeve (13) is provided between the vacuum female connector inner tube (11) and the vacuum female connector corrugated tube (12). 1) A female flange (14) is provided at one end of the outer tube (5) of the vacuum male connector, and the inner edge of the female flange (14) is connected to the outer circle of the inner tube (11) of the vacuum female connector. The male flange (8) and the female flange (14) are detachably connected together, so that the male mating sleeve (9) and the female mating sleeve (13) abut against each other. A loose flange (36) is provided on the outer circumference of the outer tube (10) of the vacuum female connector, and the loose flange (36) is located at the end of the female flange (14) away from the male flange (8). The loose flange (36) and the male flange (8) are connected together by multiple bolts, so that the male flange (8) abuts against the female flange (14). An annular positioning groove (37) is provided on the outer circumference of the female flange (14), and an annular positioning flange (38) that matches the annular positioning groove (37) is provided on the inner circumference of the loose flange (36).A positioning mechanism (39) is provided between the female flange (14) and the loose flange (36). The positioning mechanism (39) includes a limiting ring (40) and multiple positioning components (41). The limiting ring (40) is threaded onto the annular positioning groove (37). The limiting ring (40) has multiple mounting cavities (42) with a number equivalent to the number of positioning components (41). Each mounting cavity (42) includes a threaded groove (43), a movable channel (44), and a limiting opening (45) from the inside out. The diameters of the threaded groove (43), the movable channel (44), and the limiting opening (45) decrease sequentially. The positioning components (41) are set in the corresponding mounting cavities (42). The positioning components (41) include... The device comprises a limiting screw plug (46), a washer (47), a spring (48), and a locking ball (49). The limiting screw plug (46) is threaded into a threaded groove (43), and the outer end of the limiting screw plug (46) is provided with a hexagonal operating groove (50). The washer (47) is located at the inner end of the limiting screw plug (46). The spring (48) and the locking ball (49) are located in the movable channel (44), with one end of the spring (48) abutting against the washer (47) and the other end of the spring (48) abutting against the locking ball (49), so that part of the locking ball (49) is exposed outside the limiting opening (45). The inner circumference of the annular positioning flange (38) is provided with a positioning recess (51) for the locking ball (49) to be inserted.

2. The vacuum male and female connector for a liquid helium-liquid hydrogen valve according to claim 1, characterized in that: A heat-sealing assembly (15) is sandwiched between the male flange (8) and the female flange (14), and a cold-sealing assembly (16) is sandwiched between the male mating sleeve (9) and the female mating sleeve (13).

3. A vacuum male and female connector for a liquid helium-liquid hydrogen valve according to claim 2, characterized in that: The heat-sealing assembly (15) includes a heat-sealing ring (17) and an O-ring (18). The male flange (8) near the female flange (14) has a first groove (19) and a second groove (20) arranged sequentially from the inside to the outside. The heat-sealing ring (17) and the O-ring (18) are respectively embedded in the first groove (19) and the second groove (20). When the male flange (8) is locked to the female flange (14), the female flange (14) presses the O-ring (18) into the second groove (20). The female flange (14) is also provided with a pressing protrusion (21) for pressing the heat-sealing ring (17) into the first groove (19).

4. A vacuum male and female connector for a liquid helium-liquid hydrogen valve according to claim 2, characterized in that: The male fitting (9) has a first sealing groove (22) on its outer periphery, and the female fitting (13) has a second sealing groove (23) on its outer periphery. The first sealing groove (22) and the second sealing groove (23) are combined to form a sealing cavity (24). The cold sealing assembly (16) is disposed in the sealing cavity (24). The cold sealing assembly (16) includes a support ring (25) and a first PTFE retaining ring (26) and a second PTFE retaining ring (27) disposed at both ends of the support ring (25). The first PTFE retaining ring (26) abuts against the inner end of the first sealing groove (22), and the second PTFE retaining ring (27) abuts against the inner end of the second sealing groove (23).

5. A vacuum male and female connector for a liquid helium-liquid hydrogen valve according to claim 4, characterized in that: The support ring (25) has a first annular V-groove (28) and a second annular V-groove (29) at both ends. The first PTFE retaining ring (26) has a first annular protrusion (30) that fits into the first annular V-groove (28). The second PTFE retaining ring (27) has a second annular protrusion (31) that fits into the second annular V-groove (29). The other end of the first PTFE retaining ring (26) corresponding to the first annular protrusion (30) has a third annular V-groove (32). The inner end of the first sealing groove (22) has a groove that fits into the third annular V-groove. (32) A matching third annular protrusion (33), the second PTFE retaining ring (27) is provided with a fourth annular V groove (34) at the other end corresponding to the second annular protrusion (31), and the inner end of the second sealing groove (23) is provided with a fourth annular protrusion (35) that matches the fourth annular V groove (34); and the positive pressure of the third annular protrusion (33) on the first PTFE retaining ring (26) is directed towards the first annular protrusion (30), and the positive pressure of the fourth annular protrusion (35) on the second PTFE retaining ring (27) is directed towards the second annular protrusion (31).

6. A vacuum male and female connector for a liquid helium-liquid hydrogen valve according to claim 1, characterized in that: The two bolts connected together are installed in opposite directions.

7. The installation process of a vacuum male and female connector for a liquid helium-liquid hydrogen valve according to any one of claims 1 to 6, characterized in that: Includes the following steps: (a) Welding: a. Welding of the vacuum female connector: First, weld the bellows of the vacuum female connector to the inner tube of the liquid helium-liquid hydrogen valve and check for leaks at the welded area; Second, weld the outer tube of the vacuum female connector to the outer tube of the liquid helium-liquid hydrogen valve and check for leaks at the welded area; Third, fit the loose flange onto the outer tube of the vacuum female connector, with its flat end facing the liquid helium-liquid hydrogen valve; Finally, weld the female flange to both the outer and inner tubes of the vacuum female connector and check for leaks at the welded area. b. Welding of the vacuum male connector: First, remove the cold sealing assembly. Step 1: Weld the bellows of the vacuum male connector to the inner tube of the liquid helium-liquid hydrogen valve and check for leaks at the welded area. Step 2: Weld the male flange to the outer tube of the vacuum male connector and the outer tube of the liquid helium-liquid hydrogen valve respectively, and check for leaks at the welded area. Step 3: Weld the outer tube of the vacuum male connector to the inner tube of the vacuum male connector and check for leaks at the welded area. (II) Installation: Before installing the male and female connectors, first, put the removed cold sealing ring assembly onto the vacuum male connector; the second step is to install the heat sealing ring assembly, embedding the heat sealing ring into the first groove of the male flange, and simultaneously embedding the matching O-ring into the second groove; the third step is to assemble the vacuum male connector and the vacuum female connector; the fourth step is to connect the loose flange and the male flange together with multiple bolts, so that the male flange and the female flange are tightly pressed together, and the installation directions of each pair of connected bolts are opposite.

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