CN219775457U - High-vacuum multilayer heat-insulating pump pool for liquid hydrogen reciprocating pump - Google Patents

Abstract

The utility model discloses a high-vacuum multilayer heat-insulating pump pool for a liquid hydrogen reciprocating pump, which relates to the technical field of low-temperature pressure containers and comprises a pump pool main body, a pump cover assembly, a liquid inlet pipe assembly, an air return pipe assembly, a liquid outlet pipe assembly and a liquid hydrogen reciprocating pump, wherein the liquid inlet pipe assembly and the air return pipe assembly are communicated with the inside of the pump pool main body; the utility model has reasonable design, and particularly designs the detachable liquid outlet connecting mechanism for ensuring the later disassembly and maintenance of the liquid hydrogen reciprocating pump so as to improve the convenience degree of the disassembly and maintenance of the liquid hydrogen reciprocating pump in the follow-up work.

Description

High-vacuum multilayer heat-insulating pump pool for liquid hydrogen reciprocating pump

Technical Field

The utility model relates to the technical field of low-temperature pressure containers, in particular to the technical field of high-vacuum multilayer heat-insulating pump tanks for liquid hydrogen reciprocating pumps.

Background

The liquid hydrogen belongs to clean and green energy, can be applied to the aspects of aerospace, aviation, civil use, medicine and the like, and is a global development trend in the future. The traditional vacuum heat-insulating low-temperature pump pool is applied to liquid nitrogen and liquefied natural gas working conditions, is matched with the traditional centrifugal pump, but cannot be applied to liquid hydrogen working conditions, and mainly is that the centrifugal pump cannot meet the liquid hydrogen working conditions. The main reason is that the molecular mass of the liquid hydrogen medium is extremely small because the liquid hydrogen medium is different from the liquid nitrogen, liquefied natural gas and other mediums, and the centrifugal pump grade required by the liquid hydrogen medium is far greater than that of a centrifugal pump used by the liquid nitrogen, the liquefied natural gas and other mediums under the condition of the same pressure of 2MPa through theoretical calculation, and the length of the centrifugal pump reaches surprisingly more than 2000 meters. Accordingly, if the vacuum heat-insulating low-temperature pump pool is required to meet the working condition of liquid hydrogen, the complexity, time and cost are all difficulties to overcome, so that the centrifugal pump matched with the conventional vacuum heat-insulating low-temperature pump pool cannot be applied to the working condition of liquid hydrogen.

So most of liquid hydrogen pump pools at present adopt liquid hydrogen reciprocating pumps as power devices, liquid hydrogen enters the pump pool through a liquid inlet pipe, when the liquid hydrogen reciprocating pumps work, pistons in the middle reciprocate up and down regularly, pass through an upper outlet and a lower outlet respectively, and then come out through a liquid outlet pipe; the gaseous hydrogen gasified in the pump pool can be discharged from the return air pipe or discharged from the discharge pipe on the pump cover when the internal pressure reaches a critical value, and finally can be recovered or burnt. The following patent technologies are also disclosed with respect to liquid hydrogen pump cells:

patent publication number CN115234827a, entitled "a double-layer cold-insulation pool structure for liquid hydrogen pump", discloses the following: the utility model provides a liquid hydrogen pump is with double-deck cold-retaining pond structure, including double-deck cold-retaining pond body, double-deck cold-retaining pond body comprises urceolus and inner tube, wherein the bottom of urceolus is connected with the base, first opening has been seted up at its top, the flange lid is installed to first opening part, the second opening has been seted up at the bottom of inner tube, be connected with the flange lid through the connecting tubule, inlet and gas vent have been seted up respectively on urceolus one side of body, and inlet mounting hole and gas vent mounting hole have been seted up on the inner tube side of body, inlet and gas vent's opposite side is located the side of urceolus and has seted up the return air mouth, and the return air mounting hole is connected with the return air mouth vacuum tube, this scheme makes liquid hydrogen pump in the liquid hydrogen station flow can effectively work, reduces the heat loss of liquid hydrogen transmission in-process, improves the transmission efficiency of liquid hydrogen pump.

The liquid hydrogen reciprocating pumps used in the liquid hydrogen pump pool disclosed in the prior art and the patent above all use traditional liquid hydrogen reciprocating pumps, the traditional liquid hydrogen reciprocating pumps have poor heat preservation effect, and the liquid outlet structure of the liquid hydrogen reciprocating pump is inconvenient to connect and disconnect, so that the liquid hydrogen reciprocating pump is inconvenient to detach and maintain in the follow-up work.

Disclosure of Invention

The utility model aims at: the utility model provides a high-vacuum multilayer heat-insulating pump pool for a liquid hydrogen reciprocating pump, which aims to solve the technical problem that a liquid outlet structure of a traditional liquid hydrogen reciprocating pump is inconvenient to connect and disconnect.

The utility model adopts the following technical scheme for realizing the purposes:

the utility model provides a high vacuum multilayer heat-insulating pump pond for liquid hydrogen reciprocating pump, includes pump pond main part, pump cover subassembly, feed liquor pipe subassembly, muffler subassembly, drain pipe subassembly and liquid hydrogen reciprocating pump, feed liquor pipe subassembly and muffler subassembly all communicate with the inside of pump pond main part, and liquid hydrogen reciprocating pump is including being located the actuating mechanism on the pump cover subassembly and being located the actuating mechanism of pump pond main part, and the drain pipe subassembly passes to be connected with convenient to detach's play liquid coupling mechanism between the end of pump cover subassembly and the actuating mechanism.

In this scheme, pressure vessel is liquid hydrogen pump pond, and this liquid hydrogen pump pond adopts liquid hydrogen reciprocating pump as power device, and liquid hydrogen passes through the feed liquor pipe subassembly and gets into inside the pump pond main part, and liquid hydrogen reciprocating pump during operation, the piston of liquid hydrogen reciprocating pump is through reciprocating from top to bottom at the actuating mechanism internal law for the inside liquid hydrogen of pump pond main part enters into liquid coupling mechanism through actuating mechanism in, the rethread drain pipe subassembly discharges liquid hydrogen pump pond.

The detachable heat insulation structure and the liquid outlet connecting mechanism are specially designed for guaranteeing the later disassembly and maintenance of the liquid hydrogen reciprocating pump so as to improve the convenience degree of the disassembly and maintenance of the liquid hydrogen reciprocating pump in the follow-up work.

Further, actuating mechanism includes piston sleeve main part, feed liquor mechanism and play liquid mechanism, and piston sleeve main part is vertical to be set up in the pump sump main part to extend to pump sump main part bottom and its bottom and seal the setting, piston sleeve main part passes through actuating mechanism drive, feed liquor mechanism and piston sleeve main part bottom intercommunication, go out liquid end and the piston sleeve main part middle part intercommunication of liquid mechanism, actuating mechanism go out liquid end and go out liquid coupling mechanism and be connected.

In this scheme, feed liquor mechanism is for seting up the inlet in piston sleeve pipe main part bottom, and the inlet can be the level setting also can be the slope setting, and play liquid end and play liquid coupling mechanism of play liquid mechanism are connected, and convenient follow-up play liquid coupling mechanism can dismantle with the drain pipe subassembly and be connected, goes out liquid coupling mechanism and as intermediate transition connection structure, realizes that the liquid hydrogen pump is plugged to unpick and wash and the maintenance.

Further, go out liquid coupling mechanism and include from the top down the loose joint, unitary axial expansion joint and the adapter that connect gradually and set up, loose joint and go out liquid pipe assembly end detachable connection, adapter and play liquid end fixed connection of liquid mechanism.

In this scheme, the liquid outlet end of adapter and liquid outlet mechanism realizes fixed connection through the welding form, and the welding form has the advantage that the connection is reliable and intensity is high, and one of oxy-acetylene welding, oxy-hydrogen welding, air acetylene welding and barometric pressure welding can be selected to the welding form. The movable joint is arranged so as to facilitate the connection and the disconnection of subsequent maintenance of the liquid hydrogen reciprocating pump; in addition, the problems of deviation of the dimension and deformation of the pipe fitting under the low-temperature working condition are considered, and the single axial expansion joint with the function of displacement compensation on the connecting pipe fitting is adopted.

Further, go out liquid mechanism and include out liquid trunk line, first play liquid branch pipe and second play liquid branch pipe, go out liquid trunk line play liquid end and adapter fixed connection, the one end of first play liquid branch pipe and second play liquid branch pipe all with go out liquid trunk line internal communication, the other end of first play liquid branch pipe and second play liquid branch pipe all with the inside intercommunication of piston sleeve pipe main part.

In the scheme, the first liquid outlet branch pipe is arranged above the second liquid outlet branch pipe, the arrangement of the first liquid outlet branch pipe and the second liquid outlet branch pipe can provide two liquid inlet channels for the main liquid pipeline, and after one liquid inlet channel fails, the other liquid inlet channel can continuously work, so that shutdown maintenance is avoided; when the liquid hydrogen reciprocating pump works normally, the piston of the liquid hydrogen reciprocating pump reciprocates up and down in the piston sleeve main body through a rule, so that liquid hydrogen enters the liquid outlet main pipeline through the first liquid outlet branch pipe and the second liquid outlet branch pipe respectively.

Further, the heat preservation structure comprises a fixed heat preservation part and a movable heat preservation part, the fixed heat preservation part is fixed on the pump cover assembly, the movable heat preservation part is installed on the actuating mechanism, a first installation through hole for installing the liquid outlet pipe assembly and a second installation through hole for installing the movable heat preservation part are arranged on the fixed heat preservation part, a reserved gap for installing the liquid outlet connecting mechanism is reserved in the fixed heat preservation part, the reserved gap is located at the first installation through hole, and polyurethane is filled in the fixed heat preservation part and the movable heat preservation part.

In this scheme, still including being arranged in the pump sump main part and being used for actuating mechanism heat retaining insulation structure, insulation structure is different with conventional pump sump heat preservation, is according to the special design of liquid hydrogen reciprocating pump structure, has both guaranteed the heat preservation effect, also does benefit to the dismantlement when maintaining the liquid hydrogen reciprocating pump simultaneously in the later stage. The fixed heat preservation part is fixed on the pump cover component; the movable heat preservation part can move along with the installation and the unloading of the liquid hydrogen reciprocating pump; meanwhile, in order to ensure connection and disconnection of a liquid hydrogen reciprocating pump liquid outlet structure, an arc-shaped reserved notch is reserved on the fixed heat preservation part.

Further, a sealing ring for sealing the pump tank main body and the pump cover assembly is arranged between the upper edge of the pump tank main body and the pump cover assembly, and the upper edge of the pump tank main body and the pump cover assembly are locked through locking assemblies uniformly distributed in the circumferential direction.

In this scheme, the sealing washer is the winding pad, and locking assembly is the locking bolt, and the winding pad is the static seal material that is used for pressure vessel's sealing part, has high temperature resistant, high pressure or corrosion resistance's performance, has good compressibility and resilience, is high-quality static seal material.

In addition, the pump cover assembly comprises a flange gland, and at least two lifting lugs are arranged on the flange gland.

Further, be provided with the diffusion tube on the pump cover subassembly, the diffusion tube lower extreme extends into the pump sump main part in, the pump sump main part is vertical pump sump main part, feed liquor pipe assembly and pump sump main part bottom intercommunication, muffler assembly and pump sump main part's middle part intercommunication.

In the scheme, when gaseous hydrogen is vaporized in the liquid hydrogen pump pool, the gaseous hydrogen is discharged out of the pump pool main body from the muffler component in normal condition; however, when the vaporized gaseous hydrogen in the pump pool main body is excessive, the exhaust amount of the air return pipe assembly is limited, the pressure in the pump pool main body can continuously rise, and when the pressure reaches a critical value, the gaseous hydrogen can be discharged from the exhaust pipe on the pump cover assembly; the gaseous hydrogen discharged from both the above methods is finally recovered or burned.

Further, the pump pool main body comprises an outer shell and an inner shell, the inner shell is sleeved in the outer shell, a vacuum heat insulation cavity is formed between the outer shell and the inner shell in an enclosing mode, and a vacuum extraction opening communicated with the inside of the vacuum heat insulation cavity is formed in the outer shell.

In this scheme, the key design of pump sump main part is in the vacuum insulation chamber, and the design in vacuum insulation chamber makes the pump sump main part have good heat preservation adiabatic effect, can prevent effectively that the inside liquid hydrogen of inner shell from carrying out heat exchange with outside air, in addition, the vacuum extraction opening is convenient to carry out the evacuation operation to the vacuum insulation chamber.

In addition, the shell of drain pipe subassembly also designs double-deck vacuum housing, also is provided with the vacuum extraction opening on the drain pipe subassembly, and the vacuum extraction opening is convenient to carry out the evacuation operation to double-deck vacuum housing.

The liquid hydrogen pump pool main body and the vacuum pipeline of the liquid outlet pipe component are respectively subjected to the treatment of the hydrogen removing agent so as to reduce the influence on the purity of the liquid hydrogen and enhance the functional operation of equipment.

Further, a purge port is formed in the pump cover assembly, a purge pipe is arranged in the purge port, penetrates through the purge port and extends into the pump pool main body, and the purge pipe comprises a vertical pipe on the upper portion and an arc pipe at the lower end.

In this scheme, be located the inside purge tube lower extreme of pump sump main part and set up to the arctube, the gaseous purge direction of design of arctube can be changed for purge direction passes through to the slant direction from vertical direction, and the setting of purge tube makes the inside cleanliness of pump sump main part promote. In addition, a temperature changing interface is arranged on the liquid inlet pipe assembly.

Further, the pump cover assembly is a circular pump cover assembly, and the liquid outlet pipe assembly and the liquid hydrogen reciprocating pump are both eccentrically arranged at the center of the pump cover assembly.

In this scheme, drain pipe subassembly and the equal eccentric design of liquid hydrogen reciprocating pump do not adopt the structure of traditional pump sump center pump play liquid, and this is because the medium is the reason of liquid hydrogen, and the pump can't adopt immersed pump, can only pressurize and improve the flow for the medium through the structural style of liquid hydrogen plunger in this scheme.

Working principle:

the liquid hydrogen pump pool adopts a liquid hydrogen reciprocating pump as a power device, liquid hydrogen enters the pump pool main body through the liquid inlet pipe assembly, when the liquid hydrogen reciprocating pump works, a piston of the liquid hydrogen reciprocating pump reciprocates up and down regularly in the actuating mechanism, so that the liquid hydrogen in the pump pool main body enters the liquid outlet connecting mechanism through the actuating mechanism, and is discharged out of the liquid hydrogen pump pool through the liquid outlet pipe assembly.

In addition, when gaseous hydrogen is vaporized in the liquid hydrogen pump tank, the gaseous hydrogen is usually discharged from the pump tank main body through the muffler assembly; however, when the vaporized gaseous hydrogen in the pump pool main body is excessive, the exhaust amount of the air return pipe assembly is limited, the pressure in the pump pool main body can continuously rise, and when the pressure reaches a critical value, the gaseous hydrogen can be discharged from the exhaust pipe on the pump cover assembly; the gaseous hydrogen discharged from both the above methods is finally recovered or burned.

The beneficial effects of the utility model are as follows:

1. the utility model has reasonable design, and particularly designs the detachable liquid outlet connecting mechanism for ensuring the later disassembly and maintenance of the liquid hydrogen reciprocating pump so as to improve the convenience degree of the disassembly and maintenance of the liquid hydrogen reciprocating pump in the follow-up work.

2. The liquid outlet connecting mechanism comprises a movable joint, a single axial expansion joint and an adapter which are sequentially connected from top to bottom, the adapter is fixedly connected with the liquid outlet end of the liquid outlet mechanism in a welding mode, and the welding mode has the advantages of reliable connection and high strength, and the movable joint is arranged so as to facilitate connection of a liquid hydrogen reciprocating pump and disconnection of subsequent maintenance; in addition, the problems of deviation of the dimension and deformation of the pipe fitting under the low-temperature working condition are considered, and the single axial expansion joint with the function of displacement compensation on the connecting pipe fitting is adopted.

3. The heat preservation structure is different from the conventional pump pool in heat preservation, is specially designed according to the structure of the liquid hydrogen reciprocating pump, ensures the heat preservation effect, and is beneficial to disassembly during later maintenance of the liquid hydrogen reciprocating pump. The fixed heat preservation part is fixed on the pump cover component; the movable heat preservation part can move along with the installation and the unloading of the liquid hydrogen reciprocating pump.

4. Because the temperature of the liquid hydrogen medium is extremely low, the material and structural design of the corresponding liquid hydrogen pump pool need to avoid the influence on equipment and functions caused by the liquid hydrogen working condition; the main body material of the liquid hydrogen pump pool is S30508, and the heat insulation material is polyurethane.

5. The lower end of the purging pipe positioned in the pump pool main body is provided with an arc-shaped pipe, the design of the arc-shaped pipe can change the gas purging direction, so that the purging direction is transited from the vertical direction to the oblique direction, and the cleaning degree in the pump pool main body is improved due to the purging pipe;

6. the liquid outlet pipe assembly and the liquid hydrogen reciprocating pump are both designed eccentrically, and a structure that the center of a traditional pump pool is connected with a pump to discharge liquid is not adopted, so that the pump cannot adopt an immersed pump due to the fact that a medium is liquid hydrogen, and the medium can be pressurized and the flow can be improved only through the structural form of the liquid hydrogen plunger in the scheme.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a partial schematic view of the structure of FIG. 1;

FIG. 5 is an enlarged view of FIG. 3 at I;

FIG. 6 is a perspective view of FIG. 1;

FIG. 7 is a schematic view of the structure of the liquid outlet connection mechanism;

FIG. 8 is a schematic structural view of a thermal insulation structure;

reference numerals: 10-pump pool main body, 11-outer shell, 12-inner shell, 20-liquid inlet pipe assembly, 30-muffler assembly, 31-variable temperature interface, 40-liquid outlet connecting mechanism, 41-movable joint, 42-single axial expansion joint, 43-adapter, 50-actuating mechanism, 51-liquid inlet mechanism, 52-piston sleeve main body, 53-liquid outlet mechanism, 531-liquid outlet main pipe, 532-first liquid outlet branch pipe, 533-second liquid outlet branch pipe, 60-pump cover assembly, 61-purge pipe, 62-diffusion pipe, 70-liquid outlet pipe assembly, 80-driving mechanism, 90-heat preservation structure, 91-movable heat preservation part, 92-fixed heat preservation part and 93-reserved notch.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In describing embodiments of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "inner", "outer", "upper", etc. are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in place when the inventive product is used, are merely for convenience of description and simplification of description, and are not indicative or implying that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Example 1

As shown in fig. 1 to 8, the present embodiment provides a high vacuum multi-layer heat-insulating pump cell for a liquid hydrogen reciprocating pump, which comprises a pump cell main body 10, a pump cover assembly 60, a liquid inlet pipe assembly 20, an air return pipe assembly 30, a liquid outlet pipe assembly 70 and a liquid hydrogen reciprocating pump, wherein the liquid inlet pipe assembly and the air return pipe assembly 30 are both communicated with the inside of the pump cell main body 10, the liquid hydrogen reciprocating pump comprises a driving mechanism 80 positioned on the pump cover assembly 60 and an actuating mechanism 50 positioned in the pump cell main body 10, and further comprises a heat-insulating structure 90 positioned in the pump cell main body 10 and used for insulating the actuating mechanism 50, and a liquid outlet connecting mechanism 40 convenient to detach is connected between the tail end of the liquid outlet pipe assembly 70 passing through the pump cover assembly 60 and the actuating mechanism 50.

In this embodiment, the pressure vessel is a liquid hydrogen pump tank, the liquid hydrogen pump tank uses a liquid hydrogen reciprocating pump as a power device, liquid hydrogen enters the pump tank main body 10 through the liquid inlet pipe assembly 20, when the liquid hydrogen reciprocating pump works, a piston of the liquid hydrogen reciprocating pump reciprocates up and down regularly in the actuating mechanism 50, so that liquid hydrogen in the pump tank main body 10 enters the liquid outlet connecting mechanism 40 through the actuating mechanism 50, and then is discharged out of the liquid hydrogen pump tank through the liquid outlet pipe assembly 70.

Critically, in order to ensure the later disassembly and maintenance of the liquid hydrogen reciprocating pump, the detachable heat insulation structure 90 and the liquid outlet connecting mechanism 40 are specially designed so as to improve the convenience of the disassembly and maintenance of the liquid hydrogen reciprocating pump in the subsequent work.

Example 2

The embodiment is further optimized based on the embodiment 1, specifically:

the liquid outlet connection mechanism 40 comprises a movable joint 41, a unitary axial expansion joint 42 and an adapter 43 which are sequentially connected from top to bottom, wherein the movable joint 41 is detachably connected with the tail end of the liquid outlet pipe assembly 70, and the adapter 43 is fixedly connected with the liquid outlet end of the executing mechanism 50.

In this embodiment, the liquid outlet ends of the adapter 43 and the liquid outlet mechanism 53 are fixedly connected in a welding manner, which has the advantages of reliable connection and high strength, and can be one of oxyacetylene welding, oxyhydrogen welding, air acetylene welding and air pressure welding. The movable joint 41 is arranged so as to facilitate the connection and disconnection of subsequent maintenance of the liquid hydrogen reciprocating pump; in addition, the single axial expansion joint 42 with the function of displacement compensation for the connecting pipe fitting is adopted in consideration of the problems of deviation of the dimension and deformation of the pipe fitting under the low-temperature working condition. Specifically, the unitary axial expansion joint 42 is a unitary axial bellows expansion joint, which is composed of a bellows and a structural member, and is mainly used for an expansion joint (bellows) that absorbs axial displacement and cannot bear the thrust of medium pressure.

The actuating mechanism 50 comprises a piston sleeve main body 52, a liquid inlet mechanism 51 and a liquid outlet mechanism 53, wherein the piston sleeve main body 52 is vertically arranged in the pump pool main body 10 and extends to the bottom of the pump pool main body 10, the bottom of the piston sleeve main body is sealed, the piston sleeve main body 52 is driven by a driving mechanism 80, the liquid inlet mechanism 51 is communicated with the bottom of the piston sleeve main body 52, the liquid inlet end of the liquid outlet mechanism 53 is communicated with the middle of the piston sleeve main body 52, and the liquid outlet end of the liquid outlet mechanism 53 is connected with the adapter 43.

In this embodiment, the liquid inlet mechanism 51 is a liquid inlet formed at the bottom of the piston sleeve main body 52, and the liquid inlet may be horizontally or obliquely arranged, and the liquid outlet end of the liquid outlet mechanism 53 is connected with the liquid outlet connection mechanism 40, so that the subsequent detachable connection of the liquid outlet connection mechanism 40 and the liquid outlet pipe assembly 70 is facilitated, and the liquid outlet connection mechanism 40 is used as an intermediate transition connection structure to realize the plugging, disassembling, washing and maintenance of the liquid hydrogen pump.

Example 3

This example was further optimized based on example 1 or 2, specifically:

the liquid outlet mechanism 53 comprises a liquid outlet main pipeline 531, a first liquid outlet branch pipe 532 and a second liquid outlet branch pipe 533, wherein the liquid outlet end of the liquid outlet main pipeline 531 is fixedly connected with the adapter 43, one ends of the first liquid outlet branch pipe 532 and the second liquid outlet branch pipe 533 are communicated with the inside of the liquid outlet main pipeline 531, and the other ends of the first liquid outlet branch pipe 532 and the second liquid outlet branch pipe 533 are communicated with the inside of the piston sleeve main body 52.

In this embodiment, the first liquid outlet branch pipe 532 is disposed above the second liquid outlet branch pipe 533, and the first liquid outlet branch pipe 532 and the second liquid outlet branch pipe 533 can provide two liquid inlet channels for the main liquid outlet pipeline 531, so that after one liquid inlet channel fails, the other liquid inlet channel can continuously work, thereby avoiding shutdown maintenance; in normal operation, the piston of the liquid hydrogen reciprocating pump reciprocates up and down in the piston sleeve body 52 in a regular manner, so that liquid hydrogen enters the main liquid outlet pipe 531 through the first liquid outlet branch pipe 532 and the second liquid outlet branch pipe 533 (533) respectively.

Example 4

This embodiment is further optimized based on any one of embodiments 1 to 3, specifically:

still including being located in the pump pond main part 10 is used for the heat retaining structure 90 of actuating mechanism 50 keeps warm, and heat retaining structure 90 includes fixed heat retaining portion 92 and removes heat retaining portion 91, and fixed heat retaining portion 92 is fixed on pump cover assembly 60, removes heat retaining portion 91 and installs on actuating mechanism 50, is provided with the first installation through-hole that is used for installing drain pipe assembly 70 and is used for installing the second installation through-hole of removing heat retaining portion 91 on fixed heat retaining portion 92, and the reservation breach 93 that is used for installing drain coupling mechanism 40 is reserved on fixed heat retaining portion 92, and reservation breach 93 is located first installation through-hole department, and the inside of fixed heat retaining portion 92 and removal heat retaining portion 91 all is filled with polyurethane.

In this embodiment, the heat insulation structure 90 is different from the conventional pump pool heat insulation structure, and is specifically designed according to the structure of the liquid hydrogen reciprocating pump, so that the heat insulation effect is ensured, and meanwhile, the disassembly during the later maintenance of the liquid hydrogen reciprocating pump is facilitated. The fixed thermal insulation 92 is fixed to the pump cover assembly 60; the movable heat retaining portion 91 is movable with the mounting and dismounting of the liquid hydrogen reciprocating pump; meanwhile, in order to ensure connection and disconnection of the liquid hydrogen reciprocating pump liquid outlet structure, an arc-shaped reserved notch 93 is reserved in the fixed heat-preserving part 92.

Wherein, the heat-insulating material is polyurethane foaming heat-insulating with relatively better heat-insulating performance. In addition, the heat preservation part and the movable heat preservation part 91 are formed by welding sealing plates, and the heat preservation part and the movable heat preservation part 91 are fully welded to ensure the tightness of the inside and prevent foaming leakage.

Example 5

This embodiment is further optimized based on any one of embodiments 1 to 4, specifically:

a sealing ring for sealing the upper edge of the pump pool main body 10 and the pump cover assembly 60 is arranged between the upper edge of the pump pool main body 10 and the pump cover assembly 60, and the upper edge of the pump pool main body 10 and the pump cover assembly 60 are locked through locking assemblies uniformly distributed in the circumferential direction.

In this embodiment, the seal ring is a winding pad, the locking assembly is a locking bolt, the winding pad is a static sealing material for a sealing portion of the pressure vessel, the winding pad is made of standard high-quality SUS304, SUS316 (V-shaped or W-shaped) metal strips and other alloy materials which are mutually overlapped and spirally wound with flexible materials such as graphite, asbestos, polytetrafluoroethylene, asbestos-free materials and the like, and the metal strips are fixed at the beginning and the end by spot welding, so that the sealing pad has high-temperature resistance, high-pressure resistance or corrosion resistance, good compression rate and rebound rate, and is a high-quality static sealing material.

In addition, the pump cap assembly 60 includes a flange cap having at least two lifting lugs disposed thereon.

Example 6

This embodiment is further optimized based on any one of embodiments 1 to 5, specifically:

the pump cover assembly 60 is provided with a diffusing pipe 62, the lower end of the diffusing pipe 62 extends into the pump pool main body 10, the pump pool main body 10 is a vertical pump pool main body 10, the liquid inlet pipe assembly 20 is communicated with the bottom of the pump pool main body 10, and the air return pipe assembly 30 is communicated with the middle of the pump pool main body 10.

In this embodiment, when gaseous hydrogen is vaporized inside the liquid hydrogen pump cell, it is common that the gaseous hydrogen is discharged from the pump cell body 10 through the muffler assembly 30; however, when the amount of vaporized gaseous hydrogen in the pump sump body 10 is excessive, the amount of the exhaust gas from the gas return pipe assembly 30 is limited, the pressure in the pump sump body 10 is continuously increased, and when the pressure reaches a critical value, the gaseous hydrogen is discharged from the exhaust pipe 62 on the pump cap assembly 60; the gaseous hydrogen discharged from both the above methods is finally recovered or burned.

Example 7

This embodiment is further optimized based on any one of embodiments 1 to 6, specifically:

the pump pool main body 10 comprises an outer shell 11 and an inner shell 12, wherein the inner shell 12 is sleeved in the outer shell 11, a vacuum heat insulation cavity is formed between the outer shell 11 and the inner shell 12, and a vacuum extraction opening communicated with the inside of the vacuum heat insulation cavity is formed in the outer shell 11.

In this embodiment, the pump pool main body 10 is designed in a vacuum insulation cavity, and the design of the vacuum insulation cavity enables the pump pool main body 10 to have a good heat insulation effect, so that the heat exchange between liquid hydrogen inside the inner shell 12 and outside air can be effectively prevented, and in addition, the vacuum pumping port facilitates the vacuumizing operation on the vacuum insulation cavity. For example, when the diameter of the outer shell 11 isThe diameter of the inner shell 12 is +.>The nominal diameter of the vacuum suction opening in the outer housing 11 can be designed as DN30. Because the temperature of the liquid hydrogen medium is extremely low, the material and structural design of the corresponding liquid hydrogen pump pool main body 10 need to avoid the influence on equipment and functions caused by the liquid hydrogen working condition; the material of the liquid hydrogen pump cell body 10 is selected as S30508.

In addition, the outer shell of the liquid outlet pipe assembly 70 is also designed into a double-layer vacuum shell, and the liquid outlet pipe assembly 70 is also provided with a vacuum extraction opening, so that the vacuum extraction opening is convenient for carrying out vacuum extraction operation on the double-layer vacuum shell. For example, when the diameter of the outer shell 11 isThe diameter of the inner shell 12 is +.>The nominal diameter of the vacuum pump-out port of the drain tube assembly 70 may be designed as DN22.

The liquid hydrogen pump tank main body 10 and the vacuum pipeline of the liquid outlet pipe assembly 70 are respectively subjected to the hydrogen removing agent treatment so as to reduce the influence on the purity of the liquid hydrogen and enhance the functional operation of equipment.

Example 8

This embodiment is further optimized based on any one of embodiments 1 to 7, specifically:

the pump cover assembly 60 is provided with a purge port, a purge pipe 61 is provided in the purge port, the purge pipe 61 extends into the pump sump body 10 through the purge port, and the purge pipe 61 includes a vertical pipe at an upper portion and an arc pipe at a lower end.

In this embodiment, the lower end of the purge tube 61 located inside the pump sump body 10 is set to be an arc tube, and the design of the arc tube can change the gas purge direction, so that the purge direction is transited from the vertical direction to the oblique direction, and the cleanliness inside the pump sump body 10 is improved due to the purge tube 61.

In addition, the inlet tube assembly 20 is provided with a temperature change interface 31.

Example 9

This embodiment is further optimized based on any one of embodiments 1 to 7, specifically:

the pump cap assembly 60 is a circular pump cap assembly 60, and the liquid discharge tube assembly 70 and the liquid hydrogen reciprocating pump are both arranged eccentrically to the center of the pump cap assembly 60.

In this embodiment, the liquid outlet pipe assembly 70 and the liquid hydrogen reciprocating pump are both designed eccentrically, and the structure of connecting the center of the conventional pump pool to the liquid outlet is not adopted, because the medium is liquid hydrogen, the pump cannot adopt a submerged pump, and the medium can be pressurized and the flow rate can be increased only through the structural form of the liquid hydrogen plunger in this scheme.

Claims (10)

1. The utility model provides a high vacuum multilayer heat insulation pump pond for liquid hydrogen reciprocating pump, its characterized in that includes pump pond main part (10), pump cover subassembly (60), feed liquor pipe assembly (20), muffler subassembly (30), drain pipe assembly (70) and liquid hydrogen reciprocating pump, feed liquor pipe assembly (20) with muffler subassembly (30) all with pump pond main part (10) inside intercommunication, liquid hydrogen reciprocating pump is including being located actuating mechanism (80) on pump cover subassembly (60) and be located actuating mechanism (50) in pump pond main part (10), drain pipe assembly (70) pass the end of pump cover subassembly (60) with be connected with between actuating mechanism (50) and be convenient for dismantle play liquid coupling mechanism (40).

2. The high-vacuum multilayer heat-insulating pump sump for a liquid hydrogen reciprocating pump according to claim 1, wherein the liquid outlet connecting mechanism (40) comprises a movable joint (41), a single-type axial expansion joint (42) and an adapter (43) which are sequentially connected from top to bottom, the movable joint (41) is detachably connected with the tail end of the liquid outlet pipe assembly (70), and the adapter (43) is fixedly connected with the liquid outlet end of the actuating mechanism (50).

3. The high-vacuum multi-layer heat-insulating pump sump for a liquid hydrogen reciprocating pump according to claim 2, wherein the actuating mechanism (50) comprises a piston sleeve main body (52), a liquid inlet mechanism (51) and a liquid outlet mechanism (53), the piston sleeve main body (52) is vertically arranged in the pump sump main body (10) and extends to the bottom of the pump sump main body (10), the piston sleeve main body (52) is driven by the driving mechanism (80), the liquid inlet mechanism (51) is communicated with the bottom of the piston sleeve main body (52), the liquid inlet end of the liquid outlet mechanism (53) is communicated with the middle of the piston sleeve main body (52), and the liquid outlet end of the liquid outlet mechanism (53) is fixedly connected with the adapter (43).

4. A high vacuum multi-layer heat-insulating pump pool for a liquid hydrogen reciprocating pump according to claim 3, characterized in that, the liquid outlet mechanism (53) comprises a main liquid outlet pipe (531), a first liquid outlet branch pipe (532) and a second liquid outlet branch pipe (533), the liquid outlet end of the main liquid outlet pipe (531) is fixedly connected with the adapter (43), one ends of the first liquid outlet branch pipe (532) and the second liquid outlet branch pipe (533) are communicated with the inside of the main liquid outlet pipe (531), and the other ends of the first liquid outlet branch pipe (532) and the second liquid outlet branch pipe (533) are communicated with the inside of the piston sleeve main body (52).

5. The high-vacuum multi-layer heat-insulating pump sump for a liquid hydrogen reciprocating pump according to claim 1, further comprising a heat-insulating structure (90) which is positioned in the pump sump main body (10) and used for insulating the actuating mechanism (50), wherein the heat-insulating structure (90) comprises a fixed heat-insulating part (92) and a movable heat-insulating part (91), the fixed heat-insulating part (92) is fixed on the pump cover assembly (60), the movable heat-insulating part (91) is installed on the actuating mechanism (50), a first installation through hole for installing the liquid outlet pipe assembly (70) and a second installation through hole for installing the movable heat-insulating part (91) are arranged on the fixed heat-insulating part (92), a reserved gap (93) for installing the liquid outlet connecting mechanism (40) is reserved on the fixed heat-insulating part (92), and polyurethane is filled in the fixed heat-insulating part (92) and the movable heat-insulating part (91).

6. The high vacuum multi-layer heat insulating pump sump for a liquid hydrogen reciprocating pump as claimed in any one of claims 1 to 5, wherein a sealing ring for sealing the pump sump body (10) and the pump cover assembly (60) is provided between the upper edge of the pump sump body (10) and the pump cover assembly (60), and the upper edge of the pump sump body (10) and the pump cover assembly (60) are locked by locking assemblies uniformly distributed in the circumferential direction.

7. The high vacuum multi-layer heat-insulating pump sump for a liquid hydrogen reciprocating pump as claimed in any one of claims 1 to 5, wherein a diffusing pipe (62) is provided on said pump cover assembly (60), a lower end of said diffusing pipe (62) extends into said pump sump body (10), said pump sump body (10) is a vertical pump sump body (10), said liquid inlet pipe assembly (20) is communicated with a bottom of said pump sump body (10), and said muffler assembly (30) is communicated with a middle of said pump sump body (10).

8. The high-vacuum multi-layer heat-insulating pump sump for a liquid hydrogen reciprocating pump according to any one of claims 1 to 5, wherein the pump sump main body (10) comprises an outer housing (11) and an inner housing (12), the inner housing (12) is sleeved in the outer housing (11), a vacuum heat-insulating cavity is enclosed between the outer housing (11) and the inner housing (12), and a vacuum extraction opening communicated with the inside of the vacuum heat-insulating cavity is arranged on the outer housing (11).

9. The high vacuum multi-layer heat insulating pump sump for a liquid hydrogen reciprocating pump according to claim 1, wherein a purge port is provided on the pump cover assembly (60), a purge pipe (61) is provided in the purge port, the purge pipe (61) extends to the inside of the pump sump body (10) through the purge port, and the purge pipe (61) includes a vertical pipe at an upper portion and an arc pipe at a lower end.

10. A high vacuum multi-layer heat insulating pump sump for a liquid hydrogen reciprocating pump in accordance with any one of claims 1 to 5 or 9 wherein said pump cap assembly (60) is a circular pump cap assembly (60), said liquid outlet tube assembly (70) and said liquid hydrogen reciprocating pump being both arranged eccentrically on said pump cap assembly (60).