A vacuum socket device for receiving and transferring liquid hydrogen.

Abstract

This invention belongs to the field of cryogenic engineering research and application technology, specifically relating to a vacuum socket device for receiving and transferring liquid hydrogen. The device includes a sealing tube I, an outer tube I, a connecting tube I, an integral flange, a sealing tube II, a connecting tube II, an inner tube, a flange shoulder, an outer tube II, a flange ring, a threaded seal, a sealing ring, and a gasket. The protruding structure of the threaded seal, the annular gap B, and the large-diameter end face of the flange shoulder form chamber A. The annular gap A and the shoulder of the sealing tube II form chamber B. Chamber B communicates with an evacuation port machined on the side wall of the outer tube II. When a vacuum is drawn through the evacuation port, chamber B forms a vacuum chamber. The sealed chamber A is located outside the vacuum chamber B. This double-layered chamber enhances the effect of preventing heat exchange between liquid hydrogen and the external environment, significantly reducing evaporation loss of liquid hydrogen during transfer and reception. The socket joint has a flange connection structure, facilitating disassembly and improving the adaptability of the equipment.

Description

Technical Field

[0001] This invention belongs to the field of cryogenic engineering research and application technology, specifically relating to a vacuum socket device for receiving and transferring liquid hydrogen. Background Technology

[0002] In the receiving and refueling of liquid hydrogen and other cryogenic liquids, such as liquid oxygen, liquid nitrogen, liquid helium, and liquefied natural gas, minimizing evaporation losses has always been a major challenge in the industry. Existing liquid hydrogen and other cryogenic liquid receiving and refueling devices mainly fall into two categories: one is as follows... Figure 1 As shown in (a), the cryogenic liquid passes through an inner and outer jacketed tube, with one end connected to a liquid production or storage device and the other end connected to a receiving device for storage or use. Both ends are welded structures. The vacuum jacket is filled with insulation material (perlite, foaming material, etc.) and evacuated, or directly evacuated. Another type is... Figure 1 (b), in Figure 1 (a) On the other end, a flange or other quick-connect device is welded to facilitate disassembly.

[0003] Existing cryogenic liquid receiving and transfer devices have the following main drawbacks:

[0004] Figure 1 (a) involves directly welding the two ends of the pipeline to the equipment, which is inconvenient to disassemble. After the pipeline is filled with insulation material, the vacuuming effect is poor and the heat leakage is still serious. It is only suitable for situations where the value of the cryogenic liquid itself is low, the heat leakage requirement is small, and frequent disassembly is not required. Figure 1 (b) compared to Figure 1 (a) The addition of a quick-release structure increases the adaptability to different applications, but heat leakage of cryogenic liquids at quick-release or flange structures remains significant. Summary of the Invention

[0005] In view of this, the present invention provides a vacuum socket device for receiving and transferring liquid hydrogen. The device can reduce the evaporation loss of cryogenic liquids during the transfer and receiving process, improve the adaptability of the equipment to different applications, reduce heat leakage at quick-release or flange structures, and facilitate disassembly.

[0006] This invention is achieved through the following technical solution:

[0007] A vacuum socket apparatus for receiving and transferring liquid hydrogen, the apparatus comprising a sealing tube I, an outer tube I, a connecting tube I, an integral flange, a threaded seal, a sealing tube II, a connecting tube II, an inner tube, a flange shoulder, an outer tube II, and a flange ring;

[0008] The outer end of the sealing pipe I is machined with a frustum structure, and the other end is machined with external threads; one end of the outer pipe I is fixedly connected to the large diameter end of the frustum structure, and the other end is installed inside the integral flange; the connecting pipe I is coaxially fitted outside the outer pipe I and fixedly connected to the outside of the integral flange.

[0009] One end of the threaded seal has a raised structure that is threaded to the sealing pipe I and is held between the sealing pipe I and the outer pipe I. The other end is connected to the end of the sealing pipe II with an external thread. The sealing pipe II has a shoulder and is connected to the inner pipe. The connecting pipe II and the inner pipe are coaxially located inside the outer pipe I. The connecting pipe II and the inner pipe form an annular gap A, and the connecting pipe II and the outer pipe I form an annular gap B. The flange shoulder is a stepped cylindrical shape. The center hole is fixed to one end of the connecting pipe II. The large diameter end face abuts against the integral flange. The flange ring is fixed to the integral flange.

[0010] The raised structure of the threaded seal, the annular gap B, and the large-diameter end face of the flange shoulder form a sealed chamber A. The annular gap A and the shoulder of the sealing pipe II form chamber B. Chamber B is connected to the evacuation port machined on the side wall of the outer pipe II, so that chamber B forms a vacuum chamber.

[0011] Furthermore, the device also includes a gasket and a sealing ring; the gasket is installed between the flange and the large-diameter end face of the flange shoulder of the integral flange; the sealing ring is fitted onto the threaded seal; the threaded seal, the sealing ring, and the gasket constitute a sealing device.

[0012] Furthermore, the sealing tube I is a cylindrical tube open at both ends, with the external thread at one end of the sealing tube I meeting the large-diameter end of the frustum structure machined at the other end; the outer tube I is a cylindrical tube open at both ends, with the external thread end of the sealing tube I extending into the interior of the outer tube I; the connecting tube I is a cylindrical tube open at both ends, with one end fixed to the stepped surface formed between the integral flange protrusion structure and the flange, and the other end welded to the liquid hydrogen production device or storage tank; the structure formed by welding the sealing tube I, the outer tube I, the connecting tube I, and the integral flange is the female head of the receiving plug.

[0013] Furthermore, the sealing tube II is a cylindrical tube open at both ends; the inner tube is a cylindrical tube open at both ends, with the inner diameter of the inner tube being the same as that of the sealing tube II. The inner tube and the shoulder of the sealing tube II are coaxially connected and fixed together by welding; the connecting tube II is a cylindrical tube open at both ends, with one end welded to the shoulder of the sealing tube II, and the other end installed in the center hole of the stepped cylindrical flange shoulder ring; the outer tube II is a cylindrical tube open at both ends, installed outside the inner tube. One end of the outer tube II is coaxially connected to the small diameter end of the flange shoulder ring, and the other end is welded to the liquid hydrogen receiving device or the terminal for use; the flange ring is installed outside the small diameter end of the flange shoulder ring; the structure composed of the sealing tube II, connecting tube II, inner tube, flange ring, outer tube II, and flange ring welded together constitutes the male connector of the receiving plug.

[0014] Furthermore, the integral flange can be a loose flange, a slip-on flange, a slip-on flange with neck, or a socket flange; the threaded sealing material is polytetrafluoroethylene (PTFE); the gasket material is PTFE or graphite; the sealing ring is an O-ring, and the sealing ring material is fiberglass, aluminum, fluororubber, or nitrile rubber.

[0015] Furthermore, the liquid hydrogen can be replaced with liquid oxygen, liquid nitrogen, liquid helium, and liquefied natural gas.

[0016] Beneficial effects:

[0017] (1) The present invention provides a vacuum socket device for receiving and transferring liquid hydrogen. In the device, the protruding structure of the threaded seal, the annular gap B and the large-diameter end face of the flange shoulder form a sealed chamber A, and the annular gap A and the shoulder of the sealing tube II form an unsealed chamber B. The chamber B is connected to the evacuation port. After evacuation through the evacuation port, the chamber B forms a vacuum chamber, which prevents the liquid hydrogen from exchanging heat with the external environment during the receiving and transferring process. The sealed chamber A is set outside the vacuum chamber B. The double-layer chamber enhances the effect of preventing the liquid hydrogen from exchanging heat with the external environment and significantly reduces the evaporation loss of the cryogenic liquid during the transfer and receiving process.

[0018] (2) The present invention provides a vacuum socket device for receiving and transferring liquid hydrogen. The female and male ends of the vacuum socket device are flange connection structures, which are simple in structure and easy to disassemble and remove, thus improving the adaptability of the equipment to different occasions.

[0019] (3) The present invention provides a vacuum socket device for receiving and transferring liquid hydrogen. The device is sealed with a gasket made of polytetrafluoroethylene or graphite, and the sealing ring is an O-ring. The material is fiberglass, aluminum, fluororubber or nitrile rubber. It has a good sealing effect, reduces heat leakage at quick-release or flange structures, and can be used for any medium such as liquid hydrogen, liquid oxygen, liquid nitrogen, liquid helium, liquefied natural gas, etc., with a wide range of applications. Attached Figure Description

[0020] Figure 1 These are two existing cryogenic liquid receiving and transfer devices;

[0021] Figure 2 This is a simplified structural diagram of the vacuum socket device for receiving and transferring liquid hydrogen as described in this invention.

[0022] Figure 3 This is a simplified structural diagram of the vacuum socket device for receiving and transferring liquid hydrogen as described in this invention after assembly.

[0023] Among them, 1-Sealing pipe I, 2-Outer pipe I, 3-Connecting pipe I, 4-Integral flange, 5-Threaded seal, 6-Sealing ring, 7-Gasket, 8-Sealing pipe II, 9-Connecting pipe II, 10-Inner pipe, 11-Flange shoulder ring, 12-Outer pipe II, 13-Flange ring, 14-Cavity B, 15-Cavity A, 16-Evacuation port. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] A vacuum socket device for receiving and transferring liquid hydrogen, such as Figure 2 As shown, the device includes a sealing pipe I 1, an outer pipe I 2, a connecting pipe I 3, an integral flange 4, a threaded seal 5, a sealing ring 6, a gasket 7, a sealing pipe II 8, a connecting pipe II 9, an inner pipe 10, a flange shoulder ring 11, an outer pipe II 12, and a flange ring 13.

[0026] Sealing tube I1 is a cylindrical tube open at both ends. One end of sealing tube I1 is machined with a frustum structure, and the other end is machined with an external thread, which intersects with the large-diameter end of the frustum. Outer tube I2 is a cylindrical tube open at both ends. The external thread end of sealing tube I1 extends into the interior of outer tube I2. One end of outer tube I2 is welded to the large-diameter end of the frustum structure of sealing tube I1, and the other end of outer tube I2 is installed in the flange hole in the center of integral flange 4. Connecting tube I3 is a cylindrical tube open at both ends, coaxially fitted outside outer tube I2. One end of connecting tube I3 is welded to the stepped surface formed between the protruding structure of integral flange 4 and the flange plate, and the other end of connecting tube I3 is welded to the liquid hydrogen production device or storage tank. The structure formed by welding sealing tube I1, outer tube I2, connecting tube I3 and integral flange 4 is the female connector of the receiving plug.

[0027] The integral flange 4 can be a loose flange, a slip-on flange, a slip-on flange with neck, or a socket flange; further, in this embodiment, the integral flange 4 is a loose flange;

[0028] Sealing tube II 8 is a cylindrical tube open at both ends, with an external thread machined at one end and a shoulder at the other end; Inner tube 10 is a cylindrical tube open at both ends, with the same inner diameter as sealing tube II 8. Inner tube 10 and the shoulder of sealing tube II 8 are coaxially connected and welded together; Connecting tube II 9 is a cylindrical tube open at both ends, coaxially fitted outside inner tube 10, forming an annular gap A between them; one end of connecting tube II 9 is welded to the shoulder of sealing tube II 8, and the other end is installed in the center hole of stepped cylindrical flange shoulder ring 11; Outer tube II 12 is a cylindrical tube open at both ends, installed outside inner tube 10. One end of outer tube II 12 is coaxially welded to the small-diameter end of flange shoulder ring 11, and the other end is welded to the liquid hydrogen receiving device or the terminal for use; Outer tube II An opening is machined on the side wall of 12 as a vacuum port 16; the flange ring 13 is installed on the outside of the small diameter end of the flange shoulder ring 11; the structure formed by welding the sealing pipe II 8, connecting pipe II 9, inner pipe 10, flange ring 11, outer pipe II 12 and flange ring 13 is the male connector of the receiving plug.

[0029] The threaded seal 5, the sealing ring 6, and the gasket 7 form a sealing device; the threaded seal 5 has internal threads at both ends, and a raised structure is machined on the outer wall of one end.

[0030] When assembling the vacuum socket assembly, as follows: Figure 3 As shown, one end of the threaded seal 5 with a raised structure is threadedly connected to the sealing pipe I1, and the raised structure of the threaded seal 5 is locked between the sealing pipe I1 and the outer pipe I2; the other end of the threaded seal 5 is threadedly connected to the sealing pipe II 8, so that the sealing pipe II 8, the connecting pipe II 9 and the inner pipe 10 are all coaxially located inside the outer pipe I2, and an annular gap B is formed between the connecting pipe II 9 and the outer pipe I2; the integral flange 4 and the flange shoulder ring 11 abut against each other, and the gasket 7 is installed between the flange plate of the integral flange 4 and the large diameter end face of the flange shoulder ring 11; the sealing ring 6 is fitted on the threaded seal 5 to provide a locking function.

[0031] The integral flange 4 of the female part of the socket joint and the flange ring 13 of the male part are fixedly connected. After assembly, the raised structure of the threaded seal 5, the annular gap B and the large-diameter end face of the flange shoulder 11 form a sealed chamber A15, and the annular gap A and the shoulder of the sealing tube II 8 form an unsealed chamber B14, which is connected to the evacuation port 16. After evacuation through the evacuation port 16, the chamber B14 forms a vacuum chamber. The presence of the sealed chamber A15 and the vacuum chamber B14 reduces the evaporation loss of the cryogenic liquid during the receiving and transfer process. Furthermore, since the female and male parts of the socket joint are flange connection structures, the adaptability of the equipment to different applications is improved, and disassembly is convenient.

[0032] In this embodiment, the threaded seal 5 is made of polytetrafluoroethylene (PTFE); the gasket 7 is made of PTFE; and the sealing ring is a fiberglass O-ring.

[0033] Working principle:

[0034] During liquid hydrogen reception and transfer, the connecting pipe I 3 in the female socket joint is welded to the liquid hydrogen production device or storage tank, and the outer pipe II 12 in the male socket joint is welded to the liquid hydrogen receiving device or user terminal. The connecting pipe I 3 and the outer pipe II 12 are only used to fix the female and male joints and are not used for cryogenic liquid transfer. The vacuum socket device is assembled, and the integral flange 4 of the female socket device and the flange ring 13 of the male socket device are fixedly connected by bolts.

[0035] Liquid hydrogen flows out from the production device or storage tank and sequentially passes through the coaxial sealing tube I 1, sealing tube II 8 and inner tube 10 in the socket joint to be transferred to the liquid hydrogen receiving device or user terminal. After being evacuated through the evacuation port 16, chamber B 14 forms a vacuum chamber, preventing heat exchange between the liquid hydrogen and the external environment. Outside chamber B, there is also a sealed chamber A 15. Chambers A 15 and chamber B 14 enhance the effect of preventing heat exchange between the liquid hydrogen and the external environment, significantly reducing the evaporation loss of cryogenic liquid during the transfer and receiving process.

[0036] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A vacuum socket apparatus for receiving and transferring liquid hydrogen, characterized in that: The device includes a sealing pipe I, an outer pipe I, a connecting pipe I, an integral flange, a threaded seal, a sealing pipe II, a connecting pipe II, an inner pipe, a flange shoulder ring, an outer pipe II, and a flange ring; The outer end of the sealing pipe I is machined with a frustum structure, and the other end is machined with external threads; one end of the outer pipe I is fixedly connected to the large diameter end of the frustum structure, and the other end is installed inside the integral flange; the connecting pipe I is coaxially fitted outside the outer pipe I and fixedly connected to the outside of the integral flange. One end of the threaded seal has a raised structure that is threaded to the sealing pipe I, and the raised structure is stuck between the sealing pipe I and the outer pipe I; the other end is connected to the end of the sealing pipe II with an external thread; the sealing pipe II has a shoulder at one end that is connected to the inner pipe; the connecting pipe II and the inner pipe are coaxially located inside the outer pipe I, forming an annular gap A between the connecting pipe II and the inner pipe, and an annular gap B between the connecting pipe II and the outer pipe I; the flange shoulder is a stepped cylindrical shape, with the center hole fixed to one end of the connecting pipe II, the large diameter end face abutting against the integral flange, and the flange ring fixed to the integral flange; The raised structure of the threaded seal, the annular gap B, and the large-diameter end face of the flange shoulder form a sealed chamber A. The annular gap A and the shoulder of the sealing tube II form chamber B. Chamber B is connected to the evacuation port machined on the side wall of the outer tube II, so that chamber B forms a vacuum chamber. The liquid hydrogen can be replaced with liquid oxygen, liquid nitrogen, liquid helium, and liquefied natural gas.

2. The vacuum socket apparatus for receiving and transferring liquid hydrogen according to claim 1, characterized in that: The device also includes a gasket and a sealing ring; the gasket is installed between the flange plate of the integral flange and the large-diameter end face of the flange shoulder; the sealing ring is fitted onto the threaded seal; the threaded seal, the sealing ring, and the gasket constitute a sealing device.

3. The vacuum socket apparatus for receiving and transferring liquid hydrogen according to claim 2, characterized in that: Sealing pipe I is a cylindrical pipe open at both ends. The external thread at one end of sealing pipe I meets the large-diameter end of the frustum structure machined at the other end. Outer pipe I is a cylindrical pipe open at both ends. The external thread end of sealing pipe I extends into the interior of outer pipe I. Connecting pipe I is a cylindrical pipe open at both ends. One end is fixed to the stepped surface formed between the integral flange protrusion structure and the flange, and the other end is welded to the liquid hydrogen production device or storage tank. The structure formed by welding sealing pipe I, outer pipe I, connecting pipe I and integral flange is the female head of the receiving plug.

4. The vacuum socket apparatus for receiving and transferring liquid hydrogen according to claim 3, characterized in that: Sealing tube II is a cylindrical tube open at both ends; inner tube is a cylindrical tube open at both ends, with the same inner diameter as sealing tube II. The inner tube is coaxially connected to the shoulder of sealing tube II and fixed by welding; connecting tube II is a cylindrical tube open at both ends, with one end welded to the shoulder of sealing tube II and the other end installed in the center hole of the stepped cylindrical flange shoulder ring; outer tube II is a cylindrical tube open at both ends, installed outside the inner tube. One end of outer tube II is coaxially connected to the small diameter end of the flange shoulder ring and the other end is welded to the liquid hydrogen receiving device or the terminal; flange ring is installed outside the small diameter end of the flange shoulder ring; the structure composed of sealing tube II, connecting tube II, inner tube, flange ring, outer tube II and flange ring welded together is the male connector of the receiving plug.

5. A vacuum socket apparatus for receiving and transferring liquid hydrogen according to any one of claims 1 to 4, characterized in that: The integral flange can be a loose flange, a slip-on flange, a slip-on flange with neck, or a socket flange; the threaded seal material is polytetrafluoroethylene (PTFE); the gasket material is PTFE or graphite; the sealing ring is an O-ring, and the sealing ring material is fiberglass, aluminum, fluororubber, or nitrile rubber.

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