A pump pool structure for a liquid hydrogen cryogenic pump

Abstract

The application provides a pump pool structure for a liquid hydrogen immersed liquid pump, which comprises an inner cylinder and an outer cylinder sleeved outside the inner cylinder, the top of the outer cylinder is provided with an outer cylinder cover, the top of the inner cylinder is provided with an inner cylinder cover, the outer cylinder cover and the inner cylinder cover are respectively provided with a first mounting opening and a second mounting opening, and the liquid hydrogen immersed liquid pump is mounted in the inner cylinder through the first mounting opening and the second mounting opening; a flow straightening sleeve is arranged in the inner cylinder, the axis direction of the flow straightening sleeve is consistent with the axis direction of the inner cylinder, and the pump body of the liquid hydrogen immersed liquid pump is inserted into the surrounding space of the flow straightening sleeve. By arranging the flow straightening sleeve in the inner cylinder, the liquid inlet of the liquid hydrogen immersed liquid pump is located inside the flow straightening sleeve, which can relieve the surge of the liquid hydrogen immersed liquid pump caused by the suction of gas, and the increase of the heat loss of the pump pool structure caused by the addition of the flow straightening sleeve is avoided.

Description

Technical Field

[0001] This invention belongs to the field of cryogenic liquid transportation technology, specifically, it relates to a pump pool structure for a liquid hydrogen submersible pump. Background Technology

[0002] Hydrogen energy, as the most promising clean energy source, has the advantages of being non-toxic, pollution-free, low-consumption, high total yield, and recyclable, and is hailed as the "ultimate energy" of the 21st century.

[0003] Currently, the application of hydrogen energy in China is mainly concentrated in fuel cell vehicles, and hydrogen refueling stations are the main hub connecting upstream hydrogen production / transportation with downstream fuel cell vehicle applications. Due to the advantages of liquid hydrogen refueling stations, such as high hydrogen storage efficiency, high hydrogen purity, and low construction / operation costs, they are expected to become mainstream in the future as fuel cell vehicles gradually enter the industrialization stage.

[0004] The liquid hydrogen submersible pump is the core equipment of a liquid hydrogen refueling station. As the installation platform for the liquid hydrogen pump, the main functions of the liquid hydrogen pump tank include: ① providing the working medium for the liquid hydrogen submersible pump; ② withstanding the vibration and impact generated during pump operation; ③ monitoring parameters such as pressure, temperature, and liquid level of the medium within the pump tank. Therefore, designing a liquid hydrogen pump tank with good thermal insulation and vibration and shock resistance is one of the key technologies.

[0005] On the one hand, vibration and shock resistance requires structures with good load-bearing capacity and high structural rigidity, which is generally achieved through reasonable structural design and the addition of structural materials. On the other hand, adding structural materials can lead to increased heat loss to some extent. Finding a balance between the two is the key to the development of liquid hydrogen pump tanks.

[0006] In view of this, the present invention is hereby proposed. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome at least some of the shortcomings of the prior art and provide a pump pool structure for a liquid hydrogen submersible pump. By setting a rectifier sleeve in the inner cylinder, the liquid inlet of the liquid hydrogen submersible pump is located inside the rectifier sleeve. On the one hand, this can alleviate the surge caused by the liquid hydrogen submersible pump drawing in gas, and on the other hand, it will not increase the heat loss of the pump pool structure due to the addition of the rectifier sleeve.

[0008] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0009] A pump pool structure for a liquid hydrogen submersible pump includes an inner cylinder and an outer cylinder sleeved outside the inner cylinder. The top of the outer cylinder is provided with an outer cylinder cover, and the top of the inner cylinder is provided with an inner cylinder cover. The outer cylinder cover and the inner cylinder cover are respectively provided with a first installation port and a second installation port. The liquid hydrogen submersible pump is installed in the inner cylinder through the first installation port and the second installation port.

[0010] A rectifier sleeve is provided in the inner cylinder, and the axial direction of the rectifier sleeve is consistent with the axial direction of the inner cylinder. The pump body of the liquid hydrogen submersible pump is inserted into the surrounding space of the rectifier sleeve.

[0011] In some embodiments, liquid hydrogen inlet pipes are provided on the side walls of the outer cylinder and the inner cylinder;

[0012] The distance between the inlet of the liquid hydrogen inlet pipe and the bottom of the inner cylinder is greater than the distance between the bottom end of the rectifier sleeve and the bottom of the inner cylinder.

[0013] In some embodiments, a positioning buffer ring is provided in the surrounding space of the rectifier sleeve, and the pump body of the liquid hydrogen submersible pump abuts against the inner wall of the positioning buffer ring.

[0014] In some embodiments, the rectifier sleeve is connected to the side wall of the inner cylinder via multiple ribs.

[0015] In some embodiments, an installation sleeve assembly for installing a liquid hydrogen submersible pump is provided between the first installation port and the second installation port.

[0016] The mounting sleeve assembly includes:

[0017] A mating flange is used for a sealed connection with the first mounting port.

[0018] A heat insulation sleeve, wherein the sleeve body is located in the inner cylinder, and the top end of the heat insulation sleeve is sealed to the second mounting port;

[0019] A transition sleeve is provided, with its two ends connected to the bottom of the docking flange and the heat insulation sleeve, respectively. The vacuum chamber of the liquid hydrogen submersible pump is clearance-fitted with the inner wall of the transition sleeve.

[0020] In some embodiments, the transition sleeve includes a straight pipe section and a corrugated pipe section;

[0021] One end of the straight pipe section is connected to the mating flange, and the other end is connected to one end of the corrugated pipe section. The other end of the corrugated pipe section is connected to the bottom end of the heat insulation sleeve.

[0022] In some embodiments, the vacuum chamber of the liquid hydrogen submersible pump is sealed to the bottom end of the transition sleeve by a sealing ring;

[0023] A gas connection pipe is provided between the transition sleeve and the inner cylinder cover. The gas connection pipe is used to introduce the gas in the gap formed between the vacuum chamber of the liquid hydrogen submersible pump and the inner side wall of the transition sleeve into the inner cylinder.

[0024] In some embodiments, a heat-insulating support structure is provided between the bottom of the inner cylinder and the bottom of the outer cylinder.

[0025] In some embodiments, the thermal insulation support structure includes a first fixing sleeve and a second fixing sleeve that are respectively fixedly connected to the bottom of the outer cylinder and the bottom of the inner cylinder;

[0026] The first fixing sleeve is slidably fitted onto the outside of the second fixing sleeve; or, the first fixing sleeve is slidably inserted into the inside of the second fixing sleeve.

[0027] In some embodiments, the first fixing sleeve and the second fixing sleeve are made of fiberglass.

[0028] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0029] 1. The pump pool structure for a liquid hydrogen submersible pump provided by this invention, by setting a rectifier sleeve in the inner cylinder to allow the pump body of the liquid hydrogen submersible pump to be inserted, so that the inlet of the liquid hydrogen submersible pump is located inside the rectifier sleeve, can alleviate the surge caused by the liquid hydrogen submersible pump due to gas intake, and also avoid increasing the heat loss of the pump pool structure due to the addition of the rectifier sleeve, thus reducing heat leakage. In addition, during the transportation of the pump pool structure, which is generally fixed laterally on the transport vehicle, the rectifier sleeve can also support the pump body of the liquid hydrogen submersible pump, alleviate the shear force generated by the lateral placement of the pump body, and prevent damage to the pump body during transportation.

[0030] 2. The pump pool structure for liquid hydrogen submersible pumps provided by the present invention provides an installation sleeve assembly for installing liquid hydrogen submersible pumps by setting an installation sleeve assembly between the first installation port of the outer barrel cover and the second installation port of the inner barrel cover, so that the inner wall of the sleeve fits in close contact with the vacuum chamber of the liquid hydrogen submersible pump body. This facilitates the installation and disassembly of the liquid hydrogen submersible pump and can isolate the heat leakage generated by the low temperature liquid in the pump pool structure through the pump pool cover to the greatest extent.

[0031] 3. The pump pool structure for liquid hydrogen submersible pumps provided by the present invention further prevents structural damage to the inner cylinder when the liquid hydrogen submersible pump is working by setting a heat insulation support structure between the bottom of the inner cylinder and the bottom of the outer cylinder.

[0032] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0033] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0034] Figure 1 This is a schematic diagram of the pump pool structure for a liquid hydrogen submersible pump provided according to an exemplary embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of the mounting sleeve assembly provided according to an exemplary embodiment of the present invention.

[0036] In the diagram: 100, pump tank structure;

[0037] 10. Inner cylinder; 11. Inner cylinder cover; 12. Second mounting port; 13. Rectifying sleeve; 14. Positioning buffer ring; 15. Rib plate;

[0038] 20. Outer cylinder; 21. Outer cylinder cover; 22. First mounting port; 23. Thermal insulation support structure; 24. Base;

[0039] 30. Liquid hydrogen inlet pipe;

[0040] 40. Return air pipe assembly;

[0041] 50. Vacuum insulation cavity;

[0042] 60. Liquid hydrogen submersible pump; 61. Pump body; 62. Vacuum chamber;

[0043] 70. Install sleeve assembly; 71. Connecting flange; 72. Insulating sleeve; 73. Transition sleeve; 731. Straight pipe section; 732. Corrugated pipe section;

[0044] 80. Gas connection pipe;

[0045] 90. Sealing ring.

[0046] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0048] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] Figure 1 The structure of a pump pool structure 100 for a liquid hydrogen submersible pump provided according to an exemplary embodiment of the present invention is shown.

[0051] like Figure 1 As shown, the pump pool structure 100 for the liquid hydrogen submersible pump includes an inner cylinder 10 and an outer cylinder 20 sleeved on the outside of the inner cylinder 10. The top of the outer cylinder 20 is provided with an outer cylinder cover 21, and the top of the inner cylinder 10 is provided with an inner cylinder cover 11. The outer cylinder cover 21 and the inner cylinder cover 11 are respectively provided with a first mounting port 22 and a second mounting port 12. The liquid hydrogen submersible pump 60 is installed in the inner cylinder 10 through the first mounting port 22 and the second mounting port 12.

[0052] As an example, the outer cylinder 20 has a cylindrical structure, with its bottom fixed to the base 24 and its top closed by the outer cylinder cover 21. The inner cylinder 10 has a U-shaped cross-section and its top closed by the inner cylinder cover 11. The outer cylinder 20 and the inner cylinder 10 form a vacuum insulation cavity 50, and the outer cylinder 20 is provided with a vacuum evacuation port (not shown) that communicates with the interior of the vacuum insulation cavity 50. The vacuum evacuation port facilitates the evacuation operation of the vacuum insulation cavity 50. The design of the vacuum insulation cavity 50 gives the pump tank structure 100 good thermal insulation performance, effectively preventing heat exchange between the liquid hydrogen inside the inner cylinder 10 and the external air. In addition, the vacuum insulation cavity 50 can also be filled with a vacuum insulation layer consisting of multiple layers of reflective material and thermal insulation material wound alternately to further improve the insulation effect.

[0053] It should be noted that the material and structural design of the pump pool structure 100 for the liquid hydrogen submersible pump need to avoid the impact on the equipment and function under liquid hydrogen conditions; therefore, the material of the pump pool structure 100 for the liquid hydrogen submersible pump is stainless steel or similar material suitable for use in low-temperature environments, and this invention does not impose any restrictions here.

[0054] The inner cylinder 10 is provided with a rectifier sleeve 13, the axial direction of which is consistent with the axial direction of the inner cylinder 10, and the pump body 61 of the liquid hydrogen submersible pump 60 is inserted into the surrounding space of the rectifier sleeve 13.

[0055] In the above scheme, by setting a vertical rectifier sleeve 13 in the inner cylinder 10 to allow the pump body 61 of the liquid hydrogen submersible pump 60 to be inserted, the inlet of the liquid hydrogen submersible pump 60 is located inside the rectifier sleeve 13. On the one hand, this can alleviate the surge caused by the liquid hydrogen submersible pump 60 sucking in gas, and on the other hand, it will not increase the heat loss of the pump pool structure 100 due to the addition of the rectifier sleeve 13, thus reducing heat leakage.

[0056] In addition, during the transportation of the pump pool structure 100, the pump pool structure 100 is generally fixed horizontally on the transport vehicle. At this time, the rectifier sleeve 13 can also support the pump body 61 of the liquid hydrogen submersible pump 60, alleviate the shear force generated by the horizontal placement of the pump body 61 of the liquid hydrogen submersible pump 60, and avoid damage to the pump body 61 of the liquid hydrogen submersible pump 60 during transportation.

[0057] Optionally, the rectifying sleeve 13 is connected to the side wall of the inner cylinder 10 through multiple ribs 15, which improves the stability of the rectifying sleeve 13 and does not isolate the internal space of the inner cylinder 10, thus affecting the flow of liquid hydrogen in the inner cylinder 10.

[0058] In some embodiments, liquid hydrogen inlet pipes 30 are provided on the side walls of the outer cylinder 20 and the inner cylinder 10, and the distance between the opening of the liquid hydrogen inlet pipe 30 and the bottom of the inner cylinder 10 is greater than the distance between the bottom end of the rectifier sleeve 13 and the bottom of the inner cylinder 10.

[0059] Specifically, when liquid hydrogen enters the inner cylinder 10 through the liquid hydrogen inlet pipe 30, it will rotate along the gap between the inner wall of the inner cylinder 10 and the rectifier sleeve 13, which reduces the disturbance to the inlet and outlet flow field of the liquid hydrogen submersible pump 60 and also reduces the impact of liquid hydrogen on the pump body 61 of the liquid hydrogen submersible pump 60.

[0060] Moreover, when liquid hydrogen enters the inner cylinder 10 through the liquid hydrogen inlet pipe 30, heat leakage is inevitable, causing some of the liquid hydrogen to vaporize into gaseous hydrogen. However, since gaseous hydrogen has a lower density, after entering the inner cylinder 10, the gaseous hydrogen moves upward to the top of the inner cylinder 10 due to buoyancy, thus separating from the liquid hydrogen at the bottom. In this way, when the liquid hydrogen submersible pump 60 is working, the pump body 61 of the liquid hydrogen submersible pump 60 can be prevented from sucking in gaseous hydrogen.

[0061] As an example, the liquid hydrogen inlet pipe 30 can be configured as a double-layer vacuum tube structure to reduce heat leakage when liquid hydrogen enters the inner cylinder 10 through the liquid hydrogen inlet pipe 30. Understandably, the liquid hydrogen inlet pipe 30 is also provided with a vacuum evacuation port, which facilitates the vacuuming operation of the double-layer vacuum tube structure.

[0062] In some embodiments, a return gas pipe assembly 40 is provided on the side walls of the outer cylinder 20 and the inner cylinder 10. When gaseous hydrogen is generated inside the inner cylinder 10 due to the vaporization of liquid hydrogen, the gaseous hydrogen is usually discharged from the pump pool structure 100 through the return gas pipe assembly 40. The discharged gaseous hydrogen is eventually recovered or burned.

[0063] It should be noted that the return pipe assembly 40 may include a return pipe and commonly used structures in the art such as safety valves, rupture discs, pressure sensors and shut-off valves installed on the return pipe, which will not be described in detail here.

[0064] In some embodiments, a positioning buffer ring 14 is provided in the surrounding space of the rectifying sleeve 13, and the pump body 61 of the liquid hydrogen submersible pump 60 abuts against the inner wall of the positioning buffer ring 14. The vibration isolation ring of the positioning buffer ring 14 can effectively buffer and reduce vibration, and support and position the pump body 61 of the liquid hydrogen submersible pump 60, thereby further improving the stability of the pump body 61 of the cryogenic liquid hydrogen submersible pump 60.

[0065] It should be noted that the positioning buffer ring 14 should be made of a low-temperature elastomer material that can maintain elasticity even at low temperatures for extended periods. Examples include cryogenic dienes and cryogenic rubber.

[0066] Those skilled in the art know that compared to cryogenic liquids such as LNG, liquid hydrogen has a lower temperature, reaching -253°C. Therefore, the liquid hydrogen submersible pump 60 must be placed in a vacuum-insulated pump pool structure with excellent thermal insulation to ensure its normal and stable operation in a low-temperature environment. Thus, the insulation of the pump pool structure is particularly critical. Foreign manufacturers often use cold box insulation materials, but the insulation effect is generally limited. Domestic gas stations typically use open-type pump pools, with a flange cover on the open end to form a sealed container structure. However, whether using a regular flange cover or a flange cover with a vacuum isolation chamber, it is impossible to prevent heat exchange between the cryogenic liquid inside the pump pool and the open pump pool cover. This heat exchange leads to frost and ice formation on the pump pool cover, causing cavitation inside the pump pool, increasing the starting current of the cryogenic submersible pump, affecting its service life, and making it difficult to control the temperature inside the pump pool and detect the liquid level, seriously affecting the safe and stable operation of the pump.

[0067] Based on this, the present invention provides an installation sleeve assembly 70 for installing a liquid hydrogen submersible pump 60 between the first installation port 22 of the outer cylinder cover 21 and the second installation port 12 of the inner cylinder cover 11. The installation sleeve assembly 70 enables the inner cylinder 10 to be thermally insulated from the outside, thereby reducing the heat leakage generated by the cryogenic liquid hydrogen through the inner cylinder cover 11 and the outer cylinder cover 21.

[0068] Specifically, such as Figure 2 As shown, the mounting sleeve assembly 70 includes a docking flange 71, a heat-insulating sleeve 72, and a transition sleeve 73. The docking flange 71 is sealed to the first mounting port 22. The body of the heat-insulating sleeve 72 is located within the inner cylinder 10, and its top end is sealed to the second mounting port 12. The two ends of the transition sleeve 73 are respectively connected to the bottom ends of the docking flange 71 and the heat-insulating sleeve 72. The vacuum chamber 62 of the liquid hydrogen submersible pump 60 is clearance-fitted with the inner wall of the transition sleeve 73.

[0069] In the above scheme, the heat insulation sleeve 72 has a certain height, and its body is located in the inner cylinder 10, which increases the length of the heat conduction section and reduces heat leakage. Furthermore, the two ends of the transition sleeve 73 are connected to the bottom of the mating flange 71 and the heat insulation sleeve 72 respectively, which also correspondingly increases the length of the heat conduction section, further reducing heat leakage.

[0070] It should be noted that the heat insulation sleeve 72, transition sleeve 73, etc. should be made of non-metallic heat insulation materials such as fiberglass.

[0071] In some embodiments, the transition sleeve 73 includes a straight pipe section 731 and a corrugated pipe section 732; wherein one end of the straight pipe section 731 is connected to the mating flange 71, the other end is connected to one end of the corrugated pipe section 732, and the other end of the corrugated pipe section 732 is connected to the bottom end of the heat insulation sleeve 72.

[0072] In the above scheme, the use of a corrugated pipe section 732 in the limited space of the inner cylinder 10 can increase the length of the heat conduction section and achieve the purpose of reducing heat leakage.

[0073] Furthermore, the use of a corrugated pipe in the transition sleeve 73 can alleviate the problem of dimensional deviation and the deformation problem of pipe fittings such as the heat insulation sleeve 72 under low temperature conditions. The use of corrugated pipe can compensate for the displacement of the connecting pipe fittings and absorb axial displacement.

[0074] In some embodiments, the vacuum chamber 62 of the liquid hydrogen submersible pump 60 is sealed to the bottom end of the transition sleeve 73 by a sealing ring 90 to further isolate the liquid hydrogen in the inner cylinder 10 from the external structure. However, in a low-temperature environment of -253°C, the sealing ring 90 may fail, causing gaseous hydrogen to accumulate in the gap formed between the vacuum chamber 62 of the liquid hydrogen submersible pump 60 and the inner wall of the transition sleeve 73. The accumulated gaseous hydrogen will exert pressure on the mounting sleeve assembly 70. To prevent the mounting sleeve assembly 70 from failing due to the pressure of the gaseous hydrogen, the present invention provides a gas connection pipe 80 between the transition sleeve 73 and the inner cylinder cover 11. The gas connection pipe 80 is used to introduce the gas in the gap formed between the vacuum chamber 62 of the liquid hydrogen submersible pump 60 and the inner wall of the transition sleeve 73 into the inner cylinder 10, and then discharge it from the pump pool structure 100 through the return gas pipe assembly 40.

[0075] In some embodiments, a heat-insulating support structure 23 is provided between the bottom of the inner cylinder 10 and the bottom of the outer cylinder 20 to prevent structural damage to the inner cylinder 10 when the liquid hydrogen submersible pump 60 is working.

[0076] As an example, the heat insulation support structure 23 includes a first fixing sleeve and a second fixing sleeve that are fixedly connected to the base 24 of the outer cylinder 20 and the bottom of the inner cylinder 10, respectively; the first fixing sleeve is slidably sleeved on the outside of the second fixing sleeve; or, the first fixing sleeve is slidably inserted into the inside of the second fixing sleeve.

[0077] When the inner cylinder 10 expands and contracts due to temperature difference, the second fixed sleeve can slide relative to the first fixed sleeve along the axial direction, reducing the adverse effects of stress concentration.

[0078] In some embodiments, the first and second fixing sleeves are made of fiberglass to reduce heat leakage.

[0079] It should be noted that the inner cylinder cover 11 and the outer cylinder cover 21 are also provided with mounting holes for installing temperature sensors and level gauge interfaces. After the temperature sensors and level gauges are installed, the liquid hydrogen level in the inner cylinder 10 can be effectively monitored, and the precooling process of the liquid hydrogen submersible pump 60 and the pump pool structure 100 can be accurately controlled in real time to ensure the precooling effect of the pump pool structure 100.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A pump pool structure for a liquid hydrogen submersible pump, comprising an inner cylinder and an outer cylinder sleeved outside the inner cylinder, wherein an outer cylinder cover is provided at the top of the outer cylinder and an inner cylinder cover is provided at the top of the inner cylinder, wherein a first mounting port and a second mounting port are respectively provided on the outer cylinder cover and the inner cylinder cover, and the liquid hydrogen submersible pump is installed in the inner cylinder through the first mounting port and the second mounting port; Its features are, A rectifier sleeve is provided in the inner cylinder, and the axial direction of the rectifier sleeve is consistent with the axial direction of the inner cylinder. The pump body of the liquid hydrogen submersible pump is inserted into the surrounding space of the rectifier sleeve. An installation sleeve assembly for installing a liquid hydrogen submersible pump is provided between the first installation port and the second installation port. The mounting sleeve assembly includes: A mating flange is used for a sealed connection with the first mounting port. A heat insulation sleeve, wherein the sleeve body is located in the inner cylinder, and the top end of the heat insulation sleeve is sealed to the second mounting port; A transition sleeve, the two ends of which are respectively connected to the bottom end of the docking flange and the heat insulation sleeve, and the vacuum chamber of the liquid hydrogen submersible pump is clearance-fitted with the inner wall of the transition sleeve; The vacuum chamber of the liquid hydrogen submersible pump is sealed to the bottom end of the transition sleeve by a sealing ring. A gas connection pipe is provided between the transition sleeve and the inner cylinder cover. The gas connection pipe is used to introduce the gas in the gap formed between the vacuum chamber of the liquid hydrogen submersible pump and the inner sidewall of the transition sleeve into the inner cylinder.

2. The pump tank structure for a liquid hydrogen submersible pump according to claim 1, characterized in that, Liquid hydrogen inlet pipes are provided on the side walls of the outer cylinder and the inner cylinder; The distance between the inlet of the liquid hydrogen inlet pipe and the bottom of the inner cylinder is greater than the distance between the bottom end of the rectifier sleeve and the bottom of the inner cylinder.

3. The pump tank structure for a liquid hydrogen submersible pump according to claim 1, characterized in that, A positioning buffer ring is provided in the surrounding space of the rectifier sleeve, and the pump body of the liquid hydrogen submersible pump abuts against the inner wall of the positioning buffer ring.

4. The pump tank structure for a liquid hydrogen submersible pump according to claim 1, characterized in that, The rectifier sleeve is connected to the side wall of the inner cylinder through multiple ribs.

5. The pump pool structure for a liquid hydrogen submersible pump according to any one of claims 1 to 4, characterized in that, The transition sleeve includes a straight pipe section and a corrugated pipe section; One end of the straight pipe section is connected to the mating flange, and the other end is connected to one end of the corrugated pipe section. The other end of the corrugated pipe section is connected to the bottom end of the heat insulation sleeve.

6. The pump pool structure for a liquid hydrogen submersible pump according to any one of claims 1 to 4, characterized in that, A heat-insulating support structure is provided between the bottom of the inner cylinder and the bottom of the outer cylinder.

7. The pump tank structure for a liquid hydrogen submersible pump according to claim 6, characterized in that, The thermal insulation support structure includes a first fixing sleeve and a second fixing sleeve that are fixedly connected to the bottom of the outer cylinder and the bottom of the inner cylinder, respectively. The first fixing sleeve is slidably fitted onto the outside of the second fixing sleeve; or, the first fixing sleeve is slidably inserted into the inside of the second fixing sleeve.

8. The pump tank structure for a liquid hydrogen submersible pump according to claim 7, characterized in that, The first fixing sleeve and the second fixing sleeve are made of fiberglass.

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