Pump pool structure for efficient cold insulation liquid hydrogen immersed pump
By employing multi-layer composite insulation, neck fins, and labyrinth vacuum jacketed tubes in the liquid hydrogen submersible pump pool, the heat leakage problem of the pump pool was solved, achieving efficient cold insulation and improved safety.
Patent Information
- Application Number
- CN202423219057.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-25
AI Technical Summary
The liquid hydrogen submersible pump pool suffers from severe heat leakage during operation, leading to liquid voids, icing, and frost formation at the pump cover, resulting in energy loss and safety hazards.
The pump pool structure for the high-efficiency cold-insulated liquid hydrogen submersible pump includes an outer shell, an inner container, a pump pool cover, and a multi-layer composite insulation layer. It utilizes neck tube fins to interrupt the heat conduction path, stacked packing to form a gas barrier layer, a labyrinth vacuum jacket tube to increase the length of the heat conduction path, and reduces heat conduction through the vacuum jacket and adsorbent.
It effectively reduces heat leakage at the pump cover, prevents liquid cavitation and icing, ensures efficient cooling of the equipment, and improves the safety and energy efficiency of the equipment.
Smart Images
Figure CN223594533U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to liquid hydrogen hydrogenation technical field, concretely relates to a kind of pump pool structure for high-efficiency cold insulation liquid hydrogen submerged pump. BACKGROUND
[0002] Liquid hydrogen submerged pump pool is the important equipment of liquid hydrogen hydrogenation station, and it is the installation platform of liquid hydrogen submerged pump, for providing working medium for liquid hydrogen submerged pump.
[0003] During the operation of liquid hydrogen submerged pump, heat leakage is serious at the pump cover of liquid hydrogen pump pool, which leads to liquid emptying phenomenon at the pump cover, and icing and frosting problems of the pump cover;
[0004] The traditional low-temperature liquid submerged pump pool structure is mainly composed of an outer shell, an inner container, a pump pool cover and a thermal insulation layer. The inner container stores liquid hydrogen medium, and the temperature of the liquid hydrogen is -253℃. The outer shell and the pump pool cover are at atmospheric temperature. Since there is a temperature difference of about 273℃ between the outer shell, the pump pool cover and the inner container, heat transfer will inevitably occur. The traditional low-temperature liquid submerged pump pool structure has a large heat leakage, which leads to the formation of liquid emptying phenomenon, icing and frosting problems at the pump pool cover, and certain energy loss and safety hazards. SUMMARY
[0005] The utility model aims to provide a pump pool structure for high-efficiency cold insulation liquid hydrogen submerged pump with good cold insulation effect.
[0006] To achieve the above object, the utility model discloses the following technical scheme: A kind of pump pool structure for high-efficiency cold-keeping liquid hydrogen submerged pump, including shell, inner container, pump pool cover, shell and inner container are all closed at lower end and upper end is open, inner container is arranged in the inside of shell, inner container flange is fixed at the upper end of inner container, inner container flange is pressed in the upper end open edge of shell, so that inner container flange, inner container and shell are collectively formed around the vacuum interlayer of outer portion of inner container;The pump pool cover is pressed and locked in inner container flange, installation port is provided on the pump pool cover, which is opposite the top opening of inner container, packing gland is installed in the inside of inner container, the inner space of inner container is divided into upper chamber and lower chamber by packing gland, lower chamber is used to accommodate liquid hydrogen submerged pump, inlet port is provided on the side wall of inner container where lower chamber is located, inlet port is connected with inlet pipe, inlet pipe is sealed and extends out of shell, connecting seat is installed on packing gland, connecting seat is used to install liquid hydrogen submerged pump, outlet hole is provided on connecting seat, which is just connected with outlet of liquid hydrogen submerged pump when liquid hydrogen submerged pump is installed on connecting seat, outlet hole of connecting seat is connected with lower inlet end of outlet pipe, upper outlet end of outlet pipe is sequentially extended out of pump pool cover through upper chamber of inner container and installation port of pump pool cover, outer pipe is sleeved outside outlet pipe which extends out of pump pool cover, lower end port of outer pipe is connected with installation port of pump pool cover, upper end port of outer pipe and upper outlet end port of outlet pipe are connected and closed by sealing element, so that the interlayer space formed by outer pipe and outlet pipe can be connected with upper chamber of inner container and form vacuum insulation chamber together.
[0007] Further, the foregoing pump pool structure for high-efficiency cold-keeping liquid hydrogen submerged pump, wherein: the specific mounting structure of the packing gland in the inner container includes: a ring of bosses is arranged on the inner side wall of the inner container, the packing gland is pressed on the bosses of the inner side wall of the inner container through the sealing packing, a pressing sleeve is arranged above the packing gland, the lower sleeve port of the pressing sleeve downwardly and sealingly presses the packing gland, the upper sleeve port of the pressing sleeve upwardly and sealingly presses the pump pool cover, and the pump pool cover can press the packing gland against the bosses of the inner container through the pressing sleeve when the pump pool cover is locked to the inner container flange.
[0008] Further, the foregoing pump pool structure for high-efficiency cold-keeping liquid hydrogen submerged pump, wherein: the specific mounting structure of the sealing packing includes: a ring of downwardly protruding retaining rings is arranged on the bottom edge of the packing gland, the packing gland, the retaining rings, the inner wall of the inner container and the bosses jointly form a packing chamber, and the sealing packing is arranged in the packing chamber.
[0009] Further, the foregoing pump pool structure for high-efficiency cold-keeping liquid hydrogen submerged pump, wherein: the sealing packing adopts a stacked packing structure in which a plurality of layers of packing are stacked from bottom to top.
[0010] Further, the foregoing pump pool structure for high-efficiency cold-keeping liquid hydrogen submerged pump, wherein: superfine thermal insulation cotton is filled in the lower space of the upper chamber of the inner container.
[0011] Further, the foregoing high-efficiency cold-insulated liquid hydrogen submersible pump pool structure, wherein: the outer wall of the liquid outlet pipe, the outer wall of the liquid inlet pipe, and the outer wall of the inner container are all coated with a multilayer composite thermal insulation layer, and the multilayer composite thermal insulation layer is composed of a plurality of thermal insulation layers stacked from inside to outside.
[0012] Further, the foregoing high-efficiency cold-insulated liquid hydrogen submersible pump pool structure, wherein: a plurality of neck pipe fins are installed on the outer wall of the inner container from top to bottom, and each neck pipe fin protrudes from the multilayer composite thermal insulation layer coated on the outer wall of the inner container to simultaneously contact all the thermal insulation layers of the multilayer composite thermal insulation layer coated on the outer wall of the inner container.
[0013] Further, the foregoing high-efficiency cold-insulated liquid hydrogen submersible pump pool structure, wherein: the sealing element is a labyrinth vacuum jacket pipe, and the upper end of the outer pipe is connected and sealed with the upper liquid outlet end of the liquid outlet pipe through the labyrinth vacuum jacket pipe, so that a labyrinth passage is formed between the upper liquid outlet end of the liquid outlet pipe and the corresponding pipe end of the outer pipe.
[0014] Further, the foregoing high-efficiency cold-insulated liquid hydrogen submersible pump pool structure, wherein: a vacuum extraction port is arranged on the outer wall of the outer pipe and the outer wall of the outer shell, and a sealing plug capable of opening or closing the vacuum extraction port is arranged on each vacuum extraction port.
[0015] Further, the foregoing high-efficiency cold-insulated liquid hydrogen submersible pump pool structure, wherein: a normal-temperature adsorbent is arranged in the vacuum interlayer formed by the inner container flange and the outer shell, and the normal-temperature adsorbent is arranged in the upper space of the vacuum interlayer, and a low-temperature adsorbent is arranged between the bottom of the inner container and the multilayer composite thermal insulation layer coated on the bottom of the inner container.
[0016] Through the implementation of the above technical solutions, the beneficial effects of the present application are: (1) the continuity of the heat conduction path of the inner container is effectively interrupted by the neck pipe fins, and the temperature gradient between each thermal insulation layer in the multilayer composite thermal insulation layer is reduced by the temperature of the neck pipe fins, so that each thermal insulation layer of the multilayer composite thermal insulation layer reaches thermal equilibrium, thereby effectively reducing the transfer of cold energy from the inner container to the outer shell;
[0017] (2) the vacuum extraction and thermal insulation space between the liquid outlet pipe and the outer shell is increased, and the high-vacuum area can reduce heat convection and heat conduction, thereby effectively reducing the transfer of cold energy from the liquid outlet pipe to the outer shell;
[0018] (3) The accumulated packing, the packing gland, and the superfine thermal insulation cotton form a gas barrier layer, the gas barrier layer is used for sealing low-temperature hydrogen generated in the process of equipment operation in the lower chamber of the inner container, preventing the low-temperature hydrogen generated in the process of equipment operation from entering the upper chamber of the inner container to contact the pump pool cover, preventing the cold energy of the lower chamber liquid hydrogen from being transmitted to the pump pool cover, thereby effectively avoiding the liquid air phenomenon, the icing and the frosting of the pump pool cover outside, and guaranteeing efficient cold insulation of the equipment body;
[0019] (4) The interlayer space formed by the outer pipe and the liquid outlet pipe is connected with the upper chamber of the inner container and forms a vacuum insulation chamber together, the upper chamber of the inner container is a vacuum insulation chamber, the high-vacuum area can reduce heat convection and heat conduction, thereby effectively preventing the cold energy of the lower chamber liquid hydrogen from being transmitted to the pump pool cover, and guaranteeing efficient cold insulation of the equipment body;
[0020] (5) The multilayer composite insulation layer can effectively reduce heat radiation and heat conduction, and slow down the cold energy transmission of the inner container to the outer shell;
[0021] (6) The labyrinth vacuum jacket pipe is used for increasing the length of the heat conduction path, reducing heat conduction of the external environment to the equipment body when liquid enters and exits, and guaranteeing efficient cold insulation of the equipment body. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 It is a structural schematic view of the pump pool structure of the efficient cold insulation liquid hydrogen immersed liquid pump.
[0023] Figure 2 It is a schematic view of the mutual position relationship of the packing gland, the sealing packing, the pressing sleeve, the superfine thermal insulation cotton and the inner container.
[0024] Figure 3 It is a structural schematic view of the accumulated sealing packing.
[0025] Figure 4 It is a schematic view of the position relationship of the neck pipe fin, the inner container and the multilayer composite insulation layer.
[0026] Figure 5 It is a use state schematic view of the pump pool structure of the efficient cold insulation liquid hydrogen immersed liquid pump when the liquid hydrogen immersed liquid pump is installed. DETAILED DESCRIPTION
[0027] In order to make the purpose, the technical scheme and the advantages of the utility model more clearly, the utility model is further described in detail in connection with the drawings and the embodiments.
[0028] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the pump pool structure for high-efficiency cold-insulated liquid hydrogen submersible pump comprises an outer shell 1, an inner container 2, and a pump pool cover 3. The outer shell 1 and the inner container 2 are both closed at the lower end and open at the upper end. The inner container 2 is arranged inside the outer shell 1. A flange 4 is fixed to the upper end of the inner container 2. In this embodiment, the inner container 2 and the flange 4 are integrally formed. The flange 4 is formed by outwardly extending from the upper end of the inner container 2. The flange 4 is pressed against the upper end of the outer shell 1 to form a vacuum interlayer 5 around the outer container 2 together with the outer shell 1 and the inner container 2. The pump pool cover 3 is pressed against the flange 4 and is locked to the flange 4 by locking bolts 6. A mounting hole 7 is arranged in the center of the pump pool cover 3 and faces the opening of the inner container 2. A packing gland 8 is arranged inside the inner container 2. The packing gland 8 divides the inner space of the inner container 2 into an upper chamber 9 and a lower chamber 10. The lower chamber 10 is used to accommodate a liquid hydrogen submersible pump 11. An installation hole 36 is arranged on the packing gland 8. A connecting sleeve 13 is fixed to the bottom of the packing gland 8. The upper end of the connecting sleeve 13 is connected to the installation hole of the packing gland 8. The lower end of the connecting sleeve 13 is connected to a connecting seat 14. The connecting seat 14 is used to install the liquid hydrogen submersible pump 11. An outlet hole 15 is arranged on the connecting seat 14 and is connected to the outlet of the liquid hydrogen submersible pump 11 when the liquid hydrogen submersible pump 11 is installed on the connecting seat 14. The outlet hole 15 of the connecting seat 14 is connected to the lower end of an outlet pipe 16. The upper end of the outlet pipe 16 extends out of the pump pool cover 3 through the connecting sleeve 13, the installation hole 36 of the packing gland 8, the upper chamber 9 of the inner container 2, and the mounting hole 7 of the pump pool cover 3. An outer pipe 17 is arranged outside the outlet pipe 16 extending out of the pump pool cover 3. The lower end of the outer pipe 17 is connected to the mounting hole 7 of the pump pool cover 3. The upper end of the outer pipe 17 is connected to the upper end of the outlet pipe 16 by a sealing element. The space between the outer pipe 17 and the outlet pipe 16 forms a vacuum interlayer space 19 which is connected to the upper chamber 9 of the inner container 2. Superfine thermal insulation cotton 24 is filled in the lower space of the upper chamber 9 of the inner container 2. The design of the super-fine thermal insulation cotton 24 can further prevent the cold energy of the liquid hydrogen in the lower chamber from being transmitted upward to the pump pool cover, thereby ensuring the high-efficiency cold insulation of the equipment body. The sealing element can be a sealing plate directly connecting and sealing the upper end of the outer pipe 17 and the upper end of the outlet pipe 16. The sealing element can also be a labyrinth vacuum jacket pipe 18. In this embodiment, the upper end of the outer pipe 17 and the upper end of the outlet pipe 16 are connected and sealed by the labyrinth vacuum jacket pipe 18. The area between the upper end of the outlet pipe and the corresponding pipe end of the outer pipe forms a labyrinth channel. The labyrinth vacuum jacket pipe can increase the length of the heat conduction path and reduce the heat conduction from the external environment to the equipment body when the liquid enters and exits.A liquid inlet is arranged on the side wall of the inner container 2 where the lower chamber 10 is located, and a liquid inlet mounting port is arranged on the side wall of the outer shell 1. The liquid inlet is connected to one end of the liquid inlet pipe 12, and the other end of the liquid inlet pipe 12 extends out of the outer shell 1 from the liquid inlet mounting port of the outer shell 1. The end of the liquid inlet pipe that is opposite to the liquid inlet of the inner container 2 is defined as the inner end of the liquid inlet pipe, and the end of the liquid inlet pipe that extends out of the outer shell is defined as the outer end of the liquid inlet pipe. A first outer pipe 33 is sleeved outside the pipe section of the liquid inlet pipe that extends out of the outer shell 1. One end of the first outer pipe 33 is in communication with the liquid inlet mounting port of the outer shell 1. The end of the first outer pipe that is opposite to the liquid inlet mounting port of the outer shell is defined as the inner end of the first outer pipe, and the other end of the first outer pipe is defined as the outer end of the first outer pipe. The outer end of the first outer pipe is connected and closed with the outer end of the liquid inlet pipe by the labyrinth vacuum jacket pipe 18, so that the interlayer space between the first outer pipe 33 and the liquid inlet pipe 12 can be in communication with the vacuum interlayer 5 that is jointly formed by the inner container flange 4, the inner container 2 and the outer shell 1. A vacuum port 28 is arranged on the outer wall of the outer pipe 17 and the outer wall of the outer shell 1. A sealing plug 29 that can open or close the vacuum port 28 is arranged on each vacuum port 28. When it is necessary to perform vacuumization on the vacuum insulation chamber formed by the interlayer space 19 and the upper chamber 9 of the inner container, the sealing plug 29 of the vacuum port 28 on the outer wall of the outer pipe 17 is only pulled out, and then vacuumization is performed by a vacuum pump or other vacuumization components. Since the interlayer space 19 and the upper chamber 9 of the inner container are in communication with each other, the upper chamber 9 of the inner container can be vacuumized at the same time when the interlayer space 19 is vacuumized, which is convenient to operate.
[0029] A gas return port is arranged on the side wall of the inner container 2 where the lower chamber 10 is located, and a gas return mounting port is arranged on the side wall of the outer shell 1. The gas return port is connected to one end of the gas return pipe 34, and the other end of the gas return pipe 34 extends out of the outer shell 1 from the gas return mounting port of the outer shell 1. The end of the gas return pipe that is opposite to the gas return port of the inner container 2 is defined as the inner end of the gas return pipe, and the end of the gas return pipe that extends out of the outer shell is defined as the outer end of the gas return pipe. A second outer pipe 35 is sleeved outside the pipe section of the gas return pipe that extends out of the outer shell 1. One end of the second outer pipe 35 is in communication with the gas return mounting port of the outer shell 1. The end of the second outer pipe that is opposite to the gas return mounting port of the outer shell is defined as the inner end of the second outer pipe, and the other end of the second outer pipe is defined as the outer end of the second outer pipe. The outer end of the second outer pipe is connected and closed with the outer end of the gas return pipe by the labyrinth vacuum jacket pipe 18, so that the interlayer space between the second outer pipe 35 and the gas return pipe 34 can be in communication with the vacuum interlayer 5 that is jointly formed by the inner container flange 4, the inner container 2 and the outer shell 1. In this way, when the vacuum interlayer 5 is vacuumized through the vacuum port 28 of the outer shell 1, the interlayer space between the second outer pipe 35 and the gas return pipe 34, and the interlayer space between the first outer pipe 33 and the liquid inlet pipe 12 can be vacuumized at the same time, which is more convenient to operate.
[0030] In the embodiment, the specific mounting structure of the filler grommet 8 in the inner container 2 comprises: a ring of bosses 20 is arranged on the inner side wall of the inner container 2, the filler grommet 8 is pressed against the bosses 20 on the inner side wall of the inner container 2 by the sealing filler 21, a pressing sleeve 22 is arranged above the filler grommet 8, the lower cylinder opening of the pressing sleeve 22 seals and presses the filler grommet 8 downward, the upper cylinder opening of the pressing sleeve 22 seals and presses the pump pool cover 3 upward, and the pump pool cover 3 can press the filler grommet 8 against the bosses 20 of the inner container 2 through the pressing sleeve 22 when the pump pool cover 3 is locked to the inner container flange 4; the mounting structure is simple, and the inner container 2 can be conveniently disassembled and assembled; and the specific mounting structure of the sealing filler is that a ring of retaining rings 23 protruding downward is arranged on the bottom edge of the filler grommet 8, the filler grommet 8, the retaining rings 23, the inner wall of the inner container 2 and the bosses 20 jointly form a filler chamber, and the sealing filler 21 is arranged in the filler chamber; the sealing filler 21 adopts a stacked filler structure in which a plurality of layers of fillers 32 are stacked and embedded in sequence from bottom to top.
[0031] In the embodiment, the outer wall of the liquid outlet pipe 16, the outer wall of the liquid inlet pipe 12, the outer wall of the gas return pipe 34 and the outer wall of the inner container 2 are all coated with a multilayer composite heat insulation layer 25, the multilayer composite heat insulation layer 25 is composed of a plurality of heat insulation layers 26 which are stacked and combined in sequence from inside to outside, and the multilayer composite heat insulation layer can effectively reduce heat radiation and heat conduction and slow down the transfer of cold energy from the inner container to the outer shell.
[0032] In the embodiment, a plurality of neck pipe fins 27 are arranged on the outer wall of the inner container 2 from top to bottom, each neck pipe fin 27 protrudes from the multilayer composite heat insulation layer 25 coated on the outer wall of the inner container 2 and simultaneously contacts all the heat insulation layers 26 of the multilayer composite heat insulation layer 25 coated on the outer wall of the inner container 2; on the one hand, the neck pipe fins can effectively interrupt the continuity of the heat conduction path of the inner container, and on the other hand, through the heat conduction of the neck pipe fins, the temperature of the neck pipe fins is used to slow down the temperature gradient between each heat insulation layer in the multilayer composite heat insulation layer, so that each heat insulation layer 26 of the multilayer composite heat insulation layer 25 reaches thermal equilibrium, thereby effectively reducing the cold energy transferred from the inner container to the outer shell.
[0033] In the embodiment, the normal-temperature adsorbent 30 is arranged in the vacuum interlayer 5 formed by the inner container flange 4, the inner container 2 and the outer shell 1, and the normal-temperature adsorbent 30 is arranged in the upper space of the vacuum interlayer 5; the low-temperature adsorbent 31 is arranged between the bottom of the inner container 2 and the multilayer composite heat insulation layer 25 coated on the bottom of the inner container 2, and the normal-temperature adsorbent 30 and the low-temperature adsorbent 31 are used to improve the stability of the equipment.
[0034] The utility model has the advantages of:
[0035] (1) the continuity of the heat conduction path of the inner container is effectively interrupted by the neck pipe fin, the temperature gradient between the heat insulation layers in the multi-layer composite heat insulation layer is slowed down by the temperature of the neck pipe fin, and each heat insulation layer of the multi-layer composite heat insulation layer reaches thermal equilibrium, so that the cold quantity of the inner container is effectively slowed down to the shell;
[0036] (2) the vacuum heat insulation space between the liquid outlet pipe and the shell is increased, the high vacuum area can reduce heat convection and heat conduction, so that the cold quantity of the liquid outlet pipe is effectively slowed down to the shell;
[0037] (3) the stacked filler, the filler gland and the superfine thermal insulation cotton form a gas barrier layer, the low-temperature hydrogen generated during the operation of the device is sealed in the lower chamber of the inner container by the gas barrier layer, the low-temperature hydrogen generated during the operation of the device is prevented from entering the upper chamber of the inner container to contact the pump pool cover, the cold quantity of the lower chamber liquid hydrogen is prevented from being transmitted upward to the pump pool cover, so that the liquid air phenomenon occurs outside the pump pool cover, and the problems of ice and frost on the pump pool cover are effectively avoided, and the device body is efficiently cooled;
[0038] (4) the sandwich space formed by the outer pipe and the liquid outlet pipe is connected with the upper chamber of the inner container and forms a vacuum heat insulation chamber together, since the upper chamber of the inner container is a vacuum heat insulation chamber, the high vacuum area can reduce heat convection and heat conduction, so that the cold quantity of the lower chamber liquid hydrogen is effectively prevented from being transmitted upward to the pump pool cover, and the device body is efficiently cooled;
[0039] (5) the multi-layer composite heat insulation layer can effectively reduce heat radiation and heat conduction, and slow down the cold quantity of the inner container to the shell;
[0040] (6) the labyrinth vacuum jacket pipe is used to increase the length of the heat conduction path, reduce the heat conduction of the external environment to the device body when the liquid enters and exits, and ensure that the device body is efficiently cooled.
[0041] The above only describes the preferred embodiments of the present application, and does not limit the present application in any other form, and any modification or equivalent change made according to the technical essence of the present application still belongs to the scope of protection required by the present application.
Claims
1. A pump pool structure for a high-efficiency cryogenic liquid hydrogen cryopump, characterized by: The application relates to a liquid hydrogen cryogenic tank, which comprises an outer shell, an inner container, and a pump pool cover, wherein the outer shell and the inner container are both closed at the lower ends and open at the upper ends, the inner container is arranged in the inner shell, a flange is fixed to the upper end of the inner container, the flange is pressed against the upper end of the outer shell, and the flange, the inner container and the outer shell jointly form a vacuum interlayer around the outer wall of the inner container; the pump pool cover is pressed and locked to the flange, an installation opening is arranged on the pump pool cover and faces the top opening of the inner container, a packing gland is arranged in the inner container, the packing gland divides the inner space of the inner container into an upper chamber and a lower chamber, the lower chamber is used for arranging a liquid hydrogen immersion pump, a liquid inlet is arranged on the side wall of the inner container, the liquid inlet is connected with a liquid inlet pipe, the liquid inlet pipe is sealed and extends out of the outer shell, a connecting seat is arranged on the packing gland and used for arranging the liquid hydrogen immersion pump, a liquid outlet hole is arranged on the connecting seat and is connected with the outlet of the liquid hydrogen immersion pump when the liquid hydrogen immersion pump is arranged on the connecting seat, the liquid outlet hole of the connecting seat is connected with the lower inlet end of a liquid outlet pipe, and the upper outlet end of the liquid outlet pipe extends out of the pump pool cover through the upper chamber of the inner container and the installation opening of the pump pool cover; an outer pipe is arranged outside the liquid outlet pipe, the lower end of the outer pipe is connected with the installation opening of the pump pool cover, and the upper end of the outer pipe is connected with the upper outlet end of the liquid outlet pipe through a sealing element, so that the space formed by the outer pipe and the liquid outlet pipe is connected with the upper chamber of the inner container and forms a vacuum insulation chamber.
2. The pump pool structure for a high-efficiency cryogenic liquid hydrogen cryopump according to claim 1, characterized by: The specific mounting structure of the packing gland in the inner container comprises the following steps: a flange is arranged on the inner side wall of the inner container, the packing gland is pressed against the flange, a pressing sleeve is arranged above the packing gland, the lower sleeve opening of the pressing sleeve is downwardly sealed and pressed against the packing gland, the upper sleeve opening of the pressing sleeve is upwardly sealed and pressed against the pump pool cover, and the pump pool cover is locked to the flange and can press the packing gland against the flange through the pressing sleeve.
3. The pump pool structure for a high-efficiency cryogenic liquid hydrogen cryopump according to claim 2, characterized by: The specific mounting structure of the sealing packing comprises the following steps: a ring-shaped stop ring is arranged on the bottom edge of the packing gland and protrudes downwardly, the packing gland, the stop ring, the inner wall of the inner container and the flange jointly form a packing chamber, and the sealing packing is arranged in the packing chamber.
4. The pump pool structure for a high-efficiency cryogenic liquid hydrogen cryopump according to claim 3, characterized by: The sealing packing adopts a stacked packing structure in which a plurality of layers of packing are stacked from bottom to top.
5. The pump pool structure for high-efficiency cryogenic liquid hydrogen cryopump according to claim 1, characterized in that: Superfine thermal insulation cotton is filled in the lower space of the upper chamber of the inner container.
6. The pump pool structure for a high-efficiency cryogenic liquid hydrogen cryopump according to claim 1, wherein: The outer wall of the liquid outlet pipe, the outer wall of the liquid inlet pipe and the outer wall of the inner container are all coated with a multilayer composite thermal insulation layer, and the multilayer composite thermal insulation layer is formed by a plurality of thermal insulation layers which are sequentially and integrally combined from inside to outside.
7. The pump pool structure for a high-efficiency cryogenic liquid hydrogen cryopump according to claim 6, characterized by: A plurality of neck pipe fins are arranged on the outer wall of the inner container from top to bottom, each neck pipe fin extends out of the multilayer composite thermal insulation layer coated on the outer wall of the inner container and simultaneously contacts all the thermal insulation layers of the multilayer composite thermal insulation layer coated on the outer wall of the inner container.
8. The pump pool structure for a high-efficiency cryogenic liquid hydrogen cryopump according to claim 1, wherein: The sealing element is a labyrinth vacuum jacket pipe, and the upper end of the outer pipe and the upper outlet end of the liquid outlet pipe are connected and sealed through the labyrinth vacuum jacket pipe, so that a labyrinth channel is formed between the upper outlet end of the liquid outlet pipe and the corresponding pipe end of the outer pipe.
9. The pump pool structure for a high-efficiency cryogenic liquid hydrogen cryopump according to claim 1, wherein: Vacuum suction openings are arranged on the outer wall of the outer pipe and the outer wall of the outer shell, and a sealing plug which can open or close the vacuum suction opening is arranged on each vacuum suction opening.
10. The pump pool structure for a high-efficiency cryogenic liquid hydrogen cryopump according to claim 1, wherein: The normal-temperature adsorbent is arranged in the vacuum interlayer formed by the inner container flange, the inner container and the shell, and the normal-temperature adsorbent is arranged in the upper space of the vacuum interlayer. The low-temperature adsorbent is arranged between the bottom of the inner container and the multi-layer composite thermal insulation layer wrapped on the bottom of the inner container.