CN111997861B - Reciprocating submerged liquid hydrogen pump capable of effectively reducing heat transfer loss - Google Patents

Reciprocating submerged liquid hydrogen pump capable of effectively reducing heat transfer loss Download PDF

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Publication number
CN111997861B
CN111997861B CN202010714775.0A CN202010714775A CN111997861B CN 111997861 B CN111997861 B CN 111997861B CN 202010714775 A CN202010714775 A CN 202010714775A CN 111997861 B CN111997861 B CN 111997861B
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China
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liquid hydrogen
cold end
cylinder
valve
piston
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CN111997861A (en
Inventor
王永强
陈正文
刘海山
文宏刚
鲁飞
韩彩红
庞雷
苏吉鑫
曲玉栋
韦志超
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HEFEI GENERAL ENVIRONMENT CONTROL TECHNOLOGY CO LTD
Hefei General Machinery Research Institute Co Ltd
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HEFEI GENERAL ENVIRONMENT CONTROL TECHNOLOGY CO LTD
Hefei General Machinery Research Institute Co Ltd
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Publication of CN111997861A publication Critical patent/CN111997861A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
    • F04B15/08—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure the liquids having low boiling points
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves
    • F04B53/1032—Spring-actuated disc valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/143—Sealing provided on the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/103—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
    • F04B15/08—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure the liquids having low boiling points
    • F04B2015/081—Liquefied gases
    • F04B2015/0822—Hydrogen

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

The invention discloses a reciprocating submerged type liquid hydrogen pump capable of effectively reducing heat transfer loss, which comprises the following components: the isolating part is connected with the liquid hydrogen container, and the pump main body is arranged in the isolating part; the cold end part of the pump main body and the power part connected with the cold end part are arranged on the pump main body; the cold junction includes the cold junction cylinder body, is equipped with the cold junction piston in the cold junction cylinder body, and cold junction cylinder body downside is provided with the isolating valve of isolating part, is equipped with the entry check valve that is used for communicateing the cold junction cylinder body epicoele of cold junction piston upside and cold junction cylinder body cavity of resorption on the cold junction piston, and the top of cold junction cylinder body is equipped with and is used for the intercommunication the export check valve of cold junction cylinder body epicoele and liquid hydrogen outlet pipe. The invention not only cancels the step of precooling before working, but also can drive the normal temperature piston through the high pressure fluid to drive the cold end to reciprocate to finish the conveying process of the liquid hydrogen, and also reduces the heat transfer speed of the supporting rod, thereby reducing the heat transfer loss of the liquid hydrogen pump and providing the possibility for configuring the liquid hydrogen pump for a large-size liquid hydrogen tank.

Description

Reciprocating submerged liquid hydrogen pump capable of effectively reducing heat transfer loss
Technical Field
The invention relates to the field of liquid hydrogen energy, in particular to a reciprocating submerged liquid hydrogen pump capable of effectively reducing heat transfer loss.
Background
Liquid hydrogen (LH 2) is a high-energy and ultralow-temperature liquid clean fuel, has incomparable advantages in terms of energy storage density and transportation cost compared with gas hydrogen and metal hydride, has a wider development space, and China also issues a plurality of related policies to support the hydrogen energy industry. The liquid hydrogen pump for conveying liquid hydrogen is one of important devices in the liquid hydrogen industry.
At present, liquid hydrogen is unloaded and conveyed by basically adopting a pressurizing and extruding mode, the design requirement of a container is high, the output pressure is low, and the high-temperature pressurizing gas can generate the risk of thermoacoustic oscillation.
In a common reciprocating type ultra-low temperature pump, a normal temperature power part generally adopts a crank link mechanism driven by a motor, and a cold end of the pump is a plunger pump structure in a vacuum heat insulation mode, and the pump is common equipment for low temperature liquid such as Liquefied Natural Gas (LNG). The method is characterized in that deep precooling is needed before a pump is started, the preparation work is complicated and long-time consuming, and the loss of BOG (low-temperature liquid obtained by liquefying gas under the critical temperature after pressurization is large, and the gas is evaporated due to the fact that the gas is difficult to be absolutely insulated from the environment and absorbs external heat) is large, so that the air is polluted and the cost is increased. In the process of LNG storage and transportation, an electric centrifugal pump completely latent in liquid exists, but the problem of motor liquid immersion cannot be solved due to the fact that the liquid hydrogen temperature (253 ℃) is far lower than that of LNG (169 ℃), and therefore the problem needs to be solved urgently.
Disclosure of Invention
In order to avoid and overcome the technical problems in the prior art, the invention provides a reciprocating submerged liquid hydrogen pump which can effectively reduce heat transfer loss. The invention not only cancels the step of precooling before working, but also can drive the normal temperature piston through the high pressure fluid to drive the cold end to reciprocate to finish the conveying process of the liquid hydrogen, and also reduces the heat transfer speed of the supporting rod, thereby reducing the heat transfer loss of the liquid hydrogen pump and providing the possibility for configuring the liquid hydrogen pump for a large-size liquid hydrogen tank.
In order to achieve the purpose, the invention provides the following technical scheme:
a reciprocating submerged liquid hydrogen pump capable of effectively reducing heat transfer loss comprises the following components:
an isolation part connected with the liquid hydrogen container, wherein the isolation part completely isolates the pump main body from the liquid hydrogen container, and the pump main body is arranged in the isolation part;
the cold end part of the pump main body is used for receiving the liquid hydrogen from the liquid hydrogen container and discharging the liquid hydrogen to the liquid hydrogen outlet pipe;
the power part is connected with the cold end part and drives the cold end part to reciprocate by adopting high-pressure fluid in a power source station, or the power part adopts a mechanical power device to remotely convey the high-pressure fluid to drive the cold end part to reciprocate, so that the discharge of liquid hydrogen is realized;
the cold end part comprises a cold end cylinder body, a cold end piston connected with the power part through a support rod is arranged in the cold end cylinder body, and a cold end piston sealing ring used for filling a gap between the cold end piston and the inner wall of the cylinder body is sleeved on the periphery of the cold end piston; an isolating valve for communicating or separating a cold end cylinder lower cavity on the lower side of the cold end piston with the liquid hydrogen container is arranged on the lower side of the cold end cylinder, an inlet one-way valve for communicating a cold end cylinder upper cavity on the upper side of the cold end piston with the cold end cylinder lower cavity is arranged on the cold end piston, and an outlet one-way valve for communicating the cold end cylinder upper cavity with the liquid hydrogen outlet pipe is arranged at the top of the cold end cylinder; and a support rod cold end sealing ring is arranged at the contact position of the support rod and the top of the cold end cylinder body.
As a first preferable scheme of the power part, the power part comprises a normal temperature component and a high-pressure fluid power source; the normal temperature assembly comprises a normal temperature piston arranged in a normal temperature cylinder body, wherein a normal temperature piston sealing ring used for filling a gap between the normal temperature piston and the inner wall of the cylinder body is sleeved on the normal temperature piston; the high-pressure fluid power source is respectively communicated with cylinder cavities at the upper side and the lower side of the normal-temperature piston through two pipelines; the working states of the cylinder cavities on the upper side and the lower side of the normal-temperature piston are different when the normal-temperature piston works, namely when the cylinder cavity on one side of the normal-temperature piston enters fluid, the cylinder cavity on the other side of the normal-temperature piston discharges the fluid; the upper end of the supporting rod penetrates through the bottom of the normal-temperature cylinder body to be connected with the normal-temperature piston, and the lower end of the supporting rod penetrates through the top of the cold-end cylinder body to be connected with the cold-end piston.
Preferably, the normal temperature assembly comprises a normal temperature cylinder body with an opening at the upper part and an opening at the lower part, a sealed top cover is arranged at the opening at the upper part of the normal temperature cylinder body, and a sealed bottom cover is arranged at the opening at the lower part of the normal temperature cylinder body; the top cover is provided with a top pipeline communicated with a cylinder cavity above the normal-temperature piston, the bottom cover is provided with a bottom pipeline communicated with the cylinder cavity below the normal-temperature piston, and the top pipeline and the bottom pipeline are two pipelines communicated with the high-pressure fluid power source; the upper end of the supporting rod penetrates through the bottom cover to be connected with the normal-temperature piston, and a supporting rod normal-temperature sealing ring is arranged at the contact position of the supporting rod and the bottom cover.
Preferably, the top pipeline and the bottom pipeline are both connected with the high-pressure fluid power source through the reversing valve, the high-pressure fluid power source provides high-pressure fluid power for only one of the top pipeline and the bottom pipeline through the reversing valve at the same time, and the reversing valve is a three-position four-way reversing valve or a three-position five-way reversing valve.
Further preferably, only the top cover of the liquid hydrogen pump extends out of the outer side of the isolation part; the bottom pipeline penetrates through the top cover to enter the isolation part and is communicated with a cylinder cavity below the normal-temperature piston through the bottom cover; and a liquid hydrogen outlet pipe for discharging the liquid hydrogen passes through the top cover to convey the liquid hydrogen to the outside.
Further preferably, the cold end is a cold end assembly; the cold end assembly comprises a cold end cylinder body with an opening at the lower part, a cold end bottom cover for sealing is fixedly arranged at the opening at the lower part of the cold end cylinder body, and a channel connected with a valve core of the isolating valve is arranged on the cold end bottom cover;
further preferably, the cold end assembly and the normal temperature assembly are fixedly connected through a support cylinder, and the support rod penetrates through the support cylinder; the liquid hydrogen outlet pipe spirally rises around the branch cylinder.
As a second preferable scheme of the power part, the power part comprises a normal temperature component and a power component; the normal-temperature assembly comprises a normal-temperature piston arranged in a normal-temperature cylinder body, wherein a normal-temperature piston sealing ring used for filling a gap between the normal-temperature piston and the inner wall of the cylinder body is sleeved on the normal-temperature piston; the power assembly comprises a power device, a liquid cavity for storing high-pressure fluid is arranged in the power device, the power device is communicated with the cylinder cavity on the lower side of the normal-temperature piston through a driving pipeline, and the high-pressure fluid in the liquid cavity is driven to enter the cylinder cavity on the lower side of the normal-temperature piston along the driving pipeline, so that the normal-temperature piston starts to move; the upper end of the supporting rod penetrates through the bottom of the normal-temperature cylinder body to be connected with the normal-temperature piston, and the lower end of the supporting rod penetrates through the top of the cold-end cylinder body to be connected with the cold-end piston;
the power device is a metering pump, a liquid cavity in the metering pump is stored with high-pressure hydraulic oil, the high-pressure hydraulic oil is high-pressure fluid, and the metering pump controls the high-pressure hydraulic oil in the liquid cavity to enter and exit a cylinder cavity on the lower side of a normal-temperature piston through a plunger; a safety relief valve is also arranged on the driving pipeline;
the driving pipeline penetrates through the top cover to enter the isolation part and is communicated with a cylinder cavity below the normal-temperature piston through the bottom cover;
the normal temperature assembly comprises a normal temperature cylinder body with an upper opening and a lower opening, a sealed top cover is arranged at the upper opening of the normal temperature cylinder body, and a sealed bottom cover is arranged at the lower opening of the normal temperature cylinder body; the liquid hydrogen pump only has a top cover extending out of the isolating part, and a liquid hydrogen outlet pipe for discharging liquid hydrogen penetrates through the top cover to convey the liquid hydrogen to the outside;
the power part also comprises a pressure stabilizing assembly used for providing power for the cold end piston in the suction process; the pressure stabilizing assembly is connected with the upper end of the normal-temperature piston, or the pressure stabilizing assembly is communicated with a cylinder cavity on the upper side of the normal-temperature piston.
As a preferable scheme of the invention, the isolation part is an isolation assembly, a groove matched with the shape of the isolation assembly is formed on the liquid hydrogen container, and the isolation assembly is arranged in the groove; the isolation assembly comprises an isolation cylinder, and a pump body of the reciprocating submerged liquid type liquid hydrogen pump is arranged in the isolation cylinder; the isolation assembly further comprises an isolation valve installed at the bottom of the isolation cylinder, and the isolation valve is a connection medium between liquid hydrogen in the liquid hydrogen container and the cold end.
Preferably, the isolation cylinder is a double-layer sleeve with an opening at the upper part and the lower part, and the double-layer sleeve divides the isolation cylinder into a cylinder cavity space and a cavity clamping space between the sleeves; a top mounting flange is arranged at the top of the isolation cylinder, a bottom mounting flange is arranged at the bottom of the isolation cylinder, the bottom mounting flange and the liquid hydrogen container form movable contact and are in sealing connection, and the top mounting flange is fixedly and hermetically connected with a top cover on the pump body; the top mounting flange is provided with a through hole which is convenient for pumping the space of the inner cylinder cavity of the isolation cylinder into a vacuum state; the isolating cylinder body is provided with a vacuumizing interface which is convenient for vacuumizing the space of the clamping cavity in the isolating cylinder, the bottom mounting flange is hollow, and the bottom mounting flange is provided with a through hole which is communicated with the inner cavity of the bottom mounting flange and the space of the clamping cavity in the isolating cylinder; and a pressure sensor or a vacuum pressure gauge is also arranged on the mounting flange at the top.
Preferably, the isolation valve comprises a valve core, a valve body and a valve cover, wherein the upper part of the valve body is in an opening shape, the valve cover is fixed on the bottom mounting flange, a circulation port for liquid hydrogen to circulate is formed in the valve cover, the valve body is fixedly arranged at the bottom of the valve cover and is positioned below the circulation port, the valve body extends downwards into the liquid hydrogen container, and at least one drainage port for liquid hydrogen to flow into the valve body is formed in the valve body; a cylindrical cold end bottom cover convex part is arranged on the lower side of the cold end bottom cover, a cold end bottom cover liquid inlet hole is formed in the cold end bottom cover convex part, and the outer diameter of the cold end bottom cover convex part is matched with the inner diameter of a circulation hole in the valve cover;
the valve core and the valve cover are matched to realize the following two working states: when the valve core is abutted to the valve cover, the flow port is blocked, and the liquid hydrogen in the liquid hydrogen container cannot be conveyed outwards;
the convex part of the cold end bottom cover on the lower side of the cold end bottom cover is inserted into the circulation port on the valve cover, and the convex part of the cold end bottom cover is pressed against the top of the valve core, so that when the valve core is not pressed against the valve cover, the drainage port, the liquid hydrogen inlet hole of the cold end bottom cover and the circulation port are communicated with each other, and liquid hydrogen in the liquid hydrogen container can be normally conveyed outwards;
the valve core is a two-section stepped column shape with a thick upper part and a thin lower part, the thin lower half section of the valve core is movably arranged at the bottom of the valve body in a penetrating way, a compression spring is arranged in the valve body and sleeved on the lower half section of the valve core, one end of the compression spring, far away from the valve body, is abutted to the upper half section of the valve core, and when the compression spring is in a natural state, the compression spring presses the upper half section of the valve core to enable the upper half section of the valve core to be blocked up by the flow opening on the valve cover.
Compared with the prior art, the invention has the beneficial effects that:
1. when the reciprocating pump is used, a reciprocating pump structure that a traditional motor directly drives a cold end (hydraulic end) piston (plunger) to reciprocate through a crank connecting rod mechanism is omitted, the reciprocating pump is changed into a submerged liquid hydrogen reciprocating pump device that high-pressure fluid remotely transmits power, namely, a high-pressure fluid power source is used for providing power for a normal-temperature assembly, the high-pressure fluid power source drives the normal-temperature piston to reciprocate up and down and simultaneously drives the cold end piston to reciprocate, compared with an electric structure of the traditional crank connecting rod, the running process is safer and quicker, and the scheme completely isolates the power source from an ultralow-temperature (-253 ℃) liquid hydrogen medium and an inflammable and explosive hydrogen medium environment, effectively solves the technical problems of motors in the ultralow-temperature environment and the safe technical problems of motor power mechanisms in the inflammable and explosive environment, and is safe and reliable and easy to implement in engineering.
2. The liquid hydrogen pump of the invention generates pressure difference in the reciprocating motion process, so that the cold end assembly sucks liquid hydrogen from the inlet one-way valve and discharges the liquid hydrogen from the outlet one-way valve to finish the transportation of the liquid hydrogen. In conventional designs, the output phase of the reciprocating pump is the scheduled phase of the piston or plunger, i.e., the strut in this configuration is under pressure. The stability of the pressed rod piece is a main checking index for preventing the rod piece from bending deformation during working and is also a main factor for restricting the size of the rod piece. Therefore, when the strut is long, a rod with a large cross-sectional size must be used to ensure safe operation. However, the working environment of the liquid hydrogen pump causes that the support rod is one of important parts for transferring heat from the cold end to the normal temperature end, and the heat transfer quantity is possibly beyond the design requirement due to the large cross section size.
Unlike conventional designs, the inlet check valve of the present invention is disposed on the cold end piston, while the outlet check valve is disposed on top of the cold end cylinder. Under the structure of the design form, when the supporting rod is in a tension state, the liquid hydrogen pump is in an output stage, so that the main stress state of the supporting rod is changed from the traditional pressure state to the tension state, the stability of the supporting rod is not the main factor for limiting the diameter of the supporting rod, and only the safety intensity check is carried out on the tension stress of the supporting rod. The structural design of the invention greatly reduces the section size of the support rod, further reduces the heat transfer speed of the support rod, reduces the heat transfer loss of the liquid hydrogen pump to be lower, and provides possibility for configuring the liquid hydrogen pump for a large-size liquid hydrogen tank. The design can make the liquid hydrogen pump work normally under the condition of smaller cross section size, thereby greatly reducing the heat transfer speed of the supporting rod and reducing the heat transfer evaporation loss of the liquid hydrogen.
In addition, because the inlet check valve is arranged on the cold end piston, after the high-pressure fluid power source is cut off, although the liquid hydrogen pump stops conveying the liquid hydrogen, the space below the cold end piston still retains the liquid hydrogen at the moment, so that the liquid hydrogen pump can directly work without precooling when restarted next time, and the working efficiency is effectively improved.
3. When the high-pressure fluid power source is used, the reversing valve is arranged between the high-pressure fluid power source and the top pipeline and the bottom pipeline, so that the high-pressure fluid power source can provide high-pressure fluid power for only one of the top pipeline and the bottom pipeline through the reversing valve at the same time, power conflict between the two pipelines is prevented, and a liquid discharging pipeline arranged on the reversing valve can effectively discharge more fluid in a normal-temperature cylinder body in the working process; the top pipeline and the bottom pipeline can be air inlet pipelines or liquid inlet pipelines, and various pipeline choices are provided for different power sources which can be connected.
4. When the invention is used, the liquid hydrogen pump is arranged in the isolation component. During operation (the liquid hydrogen pump is in the state that the installation finishes this moment), cold junction bottom convex part of the cold junction bottom downside of cold junction cylinder body inserts in the circulation mouth of valve gap, and cold junction bottom convex part pass the circulation mouth and press on the top of case makes keep having certain clearance between case and the valve gap, this moment drainage mouth on the valve body, cold junction bottom liquid hydrogen inlet hole and the circulation mouth of valve gap communicate each other, and liquid hydrogen accessible drainage mouth, cold junction bottom liquid hydrogen inlet hole and the circulation mouth in the liquid hydrogen container normally outwards transport.
Because the liquid hydrogen in the liquid hydrogen container has got into cold junction cylinder body lower chamber department through drainage mouth, cold junction bottom cap liquid hydrogen inlet hole, circulation mouth, consequently when the cold junction piston moved down under the effect of branch, the volume increase of cold junction cylinder body upper chamber, pressure diminishes, and liquid hydrogen gets into in the cold junction cylinder body upper chamber through the entry check valve on through-hole and the cold junction piston this moment, waits to discharge. On the contrary, when the cold end piston moves upwards under the action of the support rod, the volume of the upper cavity of the cold end cylinder body is reduced, the pressure is increased, and at the moment, the liquid hydrogen enters the outlet pipe of the liquid hydrogen container through the outlet one-way valve at the top of the cold end cylinder body and is finally discharged through the outlet pipe of the liquid hydrogen container; meanwhile, the volume of the lower cavity of the cold-end cylinder body is increased, the pressure is reduced, and the liquid hydrogen continuously enters the lower cavity of the cold-end cylinder body through the circulation port.
Of course, when the liquid hydrogen pump is overhauled, the cold end cylinder body is drawn out at this moment, and the cold end bottom cover convex part of the cold end bottom cover lower side of the cold end cylinder body is not inserted in the circulation port of the valve cover any more, and the cold end bottom cover convex part is not pressing at this moment the top of the valve core, and the compression spring in the isolation valve is in the state of propping up upwards and leaning on and making the valve core block up the circulation port of the valve cover, and the whole isolation valve is in the closed state promptly, ensures the closure of the liquid hydrogen container.
5. When the device is used, the liquid hydrogen pump is arranged in the isolation assembly, the cavity spaces of the bottom mounting flange and the isolation cylinder are both vacuumized through the vacuumizing interface, and the cavity space of the inner cylinder of the isolation cylinder is also vacuumized through the through hole formed in the top mounting flange, so that the heat transfer in the isolation assembly is reduced, and meanwhile, only the top cover of the liquid hydrogen pump body is positioned outside the isolation assembly, so that the heat transfer area is small, the absorption of external heat is extremely limited, and the BOG loss in the working process can be effectively reduced; a position reserved on the top mounting flange can be additionally provided with a pressure sensor, real-time pressure monitoring is carried out on the space outside the internal pump body of the isolation cylinder, when liquid hydrogen leaks, pressure rise can be timely found, danger is avoided, and meanwhile the use condition of the sealing ring can be known according to the change of pressure so as to be convenient for timely replacement; meanwhile, the hole formed in the mounting flange at the top can release trace hydrogen leaked when the liquid hydrogen pump is dismounted in the isolation assembly to the outside safely, and nitrogen purging can be carried out to the inside to ensure that no oxygen remains in the inside.
6. When the liquid hydrogen pump is used, the liquid hydrogen pump is high in temperature during normal-temperature production and low in temperature during working, so that the temperature difference is overlarge, the liquid hydrogen outlet pipe is arranged to spirally rise around the support cylinder after passing through the outlet one-way valve, the situation that the liquid hydrogen outlet pipe is contracted and broken in an excessively low-temperature state is avoided, and elastic compensation is effectively performed by arranging the liquid hydrogen pump in a spiral shape.
Drawings
Fig. 1 and 3 are schematic installation diagrams of a reciprocating submerged liquid hydrogen pump in a liquid hydrogen container, which can effectively reduce heat transfer loss.
The power section in fig. 1 includes a room temperature module 2 and a power source station 4; the power part in fig. 3 comprises a room temperature component 2 and a power component 5 which can provide remote mechanical power drive.
Fig. 2 and 4 are schematic structural views of the reciprocating submerged liquid hydrogen pump capable of effectively reducing heat transfer loss in the present invention.
Fig. 5 is a schematic structural diagram of an isolation valve in a reciprocating submerged liquid hydrogen pump, which can effectively reduce heat transfer loss.
In the figure:
1. a cold end assembly; 2. a normal temperature component; 3. an isolation component; 4. a power source station; 5. a power assembly; 6. a liquid hydrogen container; 7. a pump body 8, a liquid hydrogen container outlet pipe;
101. a sealing ring at the cold end of the supporting rod; 102. an outlet check valve; 103. a cold end piston; 104. an inlet check valve; 105. a cold end piston seal ring; 106. a cold end cylinder; 107. a cold end bottom cover; 1071. a cold end bottom cover convex part; 1072. a cold end bottom cover liquid inlet hydrogen hole;
201. supporting a cylinder; 202. a strut; 203. a bottom cover; 204. a normal-temperature sealing ring of the supporting rod; 205. a normal-temperature cylinder body; 206. a normal temperature piston sealing ring; 207. a piston at normal temperature; 208. a top cover; 209. a top pipeline; 210. a bottom pipeline;
301. a flange is arranged at the top; 302. an isolation cylinder; 303. installing a flange at the bottom; 304. an isolation valve; 3041. a valve body; 30411. a drainage opening; 3042. a compression spring; 3043. a valve cover; 3044. a valve core;
401. a high pressure fluid power source; 402. a reversing valve;
501. a metering pump; 502. a drive line; 503. a safety relief valve; 504. a pressure stabilizing container; 505. and a pressure stabilizing pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1 to 5, in an embodiment of the present invention, a reciprocating submerged type liquid hydrogen pump capable of effectively reducing heat transfer loss includes the following components:
the reciprocating submerged liquid hydrogen pump comprises the following components:
a partition connected to the liquid hydrogen container 6, the partition completely separating the pump main body 7 from the liquid hydrogen container 6, the pump main body 7 being installed inside the partition;
a pump body cold end for receiving liquid hydrogen from the liquid hydrogen container 6 and discharging the liquid hydrogen to a liquid hydrogen outlet pipe 8;
the power part is connected with the cold end part and drives the cold end part to reciprocate by adopting high-pressure fluid in the power source station 4, or the power part adopts a mechanical power device to remotely convey the high-pressure fluid to drive the cold end part to reciprocate, so that the discharge of liquid hydrogen is realized;
the cold end part comprises a cold end cylinder 106, a cold end piston 103 connected with the power part through a strut 202 is arranged in the cold end cylinder 106, and a cold end piston sealing ring 105 used for filling a gap between the cold end piston 103 and the inner wall of the cylinder is sleeved on the periphery of the cold end piston 103; an isolating valve 304 for communicating or separating a cold end cylinder lower cavity on the lower side of the cold end piston 103 with the liquid hydrogen container 6 is arranged on the lower side of the cold end cylinder 106, an inlet one-way valve 104 for communicating a cold end cylinder upper cavity on the upper side of the cold end piston 103 with the cold end cylinder lower cavity is arranged on the cold end piston 103, and an outlet one-way valve 102 for communicating the cold end cylinder upper cavity with a liquid hydrogen outlet pipe is arranged at the top of the cold end cylinder 106; a strut cold end sealing ring 101 is arranged at the contact position of the strut 202 and the top of the cold end cylinder 106.
Since the power part of the present invention has two cases, the two cases will be described separately with reference to the drawings.
First embodiment
As shown in fig. 1 and 2, the power part comprises a normal temperature assembly 2 and a high-pressure fluid power source 401; the normal temperature assembly 2 comprises a normal temperature piston 207 arranged in a normal temperature cylinder 205, wherein a normal temperature piston sealing ring 206 used for filling a gap between the normal temperature piston 207 and the inner wall of the cylinder is sleeved on the normal temperature piston 207; the high-pressure fluid power source 401 is respectively communicated with cylinder cavities at the upper side and the lower side of the normal-temperature piston 207 through two pipelines; the cylinder cavities on the upper and lower sides of the normal temperature piston 207 are different in working state, that is, when fluid enters the cylinder cavity on one side of the normal temperature piston 207, the cylinder cavity on the other side of the normal temperature piston 207 discharges the fluid; the upper end of the strut 202 passes through the bottom of the normal temperature cylinder 205 to be connected with the normal temperature piston 207, and the lower end of the strut 202 passes downwards through the top of the cold end cylinder 106 to be connected with the cold end piston 103.
The normal temperature component 2 comprises a normal temperature cylinder 205 with an opening at the upper part and the lower part, a sealed top cover 208 is arranged at the opening at the upper part of the normal temperature cylinder 205, and a sealed bottom cover 203 is arranged at the opening at the lower part; a top pipeline 209 communicated with a cylinder cavity above the normal-temperature piston 207 is arranged on the top cover 208, a bottom pipeline 210 communicated with a cylinder cavity below the normal-temperature piston 207 is arranged on the bottom cover 203, and the top pipeline 209 and the bottom pipeline 210 are two pipelines communicated with the high-pressure fluid power source 401; the upper end of the supporting rod 202 penetrates through the bottom cover 203 to be connected with a normal temperature piston 207, and a supporting rod normal temperature sealing ring 204 is arranged at the contact position of the supporting rod 202 and the bottom cover 203.
The high-pressure fluid power source can select inert gases such as nitrogen and the like, and can also select liquid such as high-pressure hydraulic oil and the like.
The top pipeline 209 and the bottom pipeline 210 are both connected with a high-pressure fluid power source 401 through a reversing valve 402, and at the same time, the high-pressure fluid power source 401 provides high-pressure fluid power for only one of the top pipeline 209 and the bottom pipeline 210 through the reversing valve 402, and the reversing valve 402 is a three-position four-way reversing valve or a three-position five-way reversing valve.
The liquid hydrogen pump only has a top cover 208 extending out of the isolation part; the bottom pipeline 210 penetrates through the top cover 208 to enter the isolation part, and then is communicated with a cylinder cavity below the normal-temperature piston 207 through the bottom cover 203; a liquid hydrogen outlet pipe for discharging liquid hydrogen passes through the top cover 208 to deliver the liquid hydrogen to the outside.
The cold end part is a cold end component 1; the cold end assembly 1 comprises a cold end cylinder 106 with an opening at the lower part, a cold end bottom cover 107 for sealing is fixedly arranged at the opening at the lower part of the cold end cylinder 106, and a channel communicated with the isolation valve 304 is formed in the cold end bottom cover 107;
the cold end component 1 and the normal temperature component 2 are fixedly connected through a support cylinder 201, and the support rod 202 penetrates through the support cylinder 201; the liquid hydrogen outlet pipe spirals up around the branch 201.
Second embodiment
As shown in fig. 3 and 4, the power part comprises a normal temperature assembly 2 and a power assembly 5; the normal temperature assembly 2 comprises a normal temperature piston 207 arranged in a normal temperature cylinder 205, wherein a normal temperature piston sealing ring 206 used for filling a gap between the normal temperature piston 207 and the inner wall of the cylinder is sleeved on the normal temperature piston 207; the power assembly 5 comprises a power device, a liquid cavity for storing high-pressure fluid is arranged in the power device, the power device is communicated with the cylinder cavity at the lower side of the normal-temperature piston 207 through a driving pipeline 502, and drives the high-pressure fluid in the liquid cavity to enter the cylinder cavity at the lower side of the normal-temperature piston 206 along the driving pipeline 502, so that the normal-temperature piston 207 starts to move; the upper end of the strut 202 passes through the bottom of the normal temperature cylinder 205 to be connected with the normal temperature piston 207, and the lower end of the strut 202 downwards passes through the top of the cold end cylinder 106 to be connected with the cold end piston 103;
the power device is a metering pump 501, a liquid cavity in the metering pump 501 stores high-pressure hydraulic oil, the high-pressure hydraulic oil is high-pressure fluid, and the metering pump 501 controls the high-pressure hydraulic oil in the liquid cavity to enter and exit a cylinder cavity on the lower side of the normal-temperature piston 207 through a plunger; a safety relief valve 503 is also arranged on the driving pipeline 502;
the driving pipeline 502 penetrates through the top cover 208 to enter the isolation part, and then is communicated with a cylinder cavity below the normal temperature piston 207 through the bottom cover 203;
the normal temperature component 2 comprises a normal temperature cylinder 205 with an opening at the upper part and the lower part, a sealed top cover 208 is arranged at the opening at the upper part of the normal temperature cylinder 205, and a sealed bottom cover 203 is arranged at the opening at the lower part; the liquid hydrogen pump only has a top cover 208 extending out of the isolation part, and a liquid hydrogen outlet pipe for discharging the liquid hydrogen passes through the top cover 208 to convey the liquid hydrogen to the outside;
the power part also comprises a pressure stabilizing component, and the power part also comprises a pressure stabilizing component used for providing power for the cold end piston 103 in the suction process; the pressure stabilizing assembly is connected with the upper end of the normal-temperature piston 207, or the pressure stabilizing assembly is communicated with a cylinder cavity on the upper side of the normal-temperature piston 207.
Specifically, as shown in fig. 3 and 4, the pressure stabilizing assembly includes a pressure stabilizing container 504, inert gas with a certain pressure is stored in the pressure stabilizing container 504, and the pressure stabilizing container 504 is communicated with the cylinder cavity on the upper side of the normal temperature piston 207 through a pressure stabilizing pipeline 505.
Of course, the pressure stabilizing assembly may also be a compression spring for stabilizing pressure, the compression spring may be disposed in the cylinder cavity on the upper side of the normal temperature piston 207, the upper end of the compression spring is connected to the top wall of the normal temperature cylinder 205, and the lower end of the compression spring is connected to the upper top surface of the normal temperature piston 207.
Since the partition is an important and critical component of the present invention, it will be described separately below with reference to the accompanying drawings.
As shown in fig. 2 and 4, the isolating part is an isolating assembly 3, a groove matched with the shape of the isolating assembly 3 is formed in the liquid hydrogen container 6, and the isolating assembly 3 is installed in the groove; the isolation assembly 3 comprises an isolation cylinder 302, and a pump body of the reciprocating submerged liquid type liquid hydrogen pump is arranged in the isolation cylinder 302; the isolation assembly 3 further comprises an isolation valve 304 mounted at the bottom of the isolation cylinder 302, wherein the isolation valve 304 is a connection medium between the liquid hydrogen in the liquid hydrogen container 6 and the cold end.
The isolation cylinder 302 is a double-layer sleeve with an upper opening and a lower opening, and the double-layer sleeve divides the isolation cylinder 302 into a cylinder cavity space and a cavity clamping space between the sleeves; a top mounting flange 301 is arranged at the top of the isolation cylinder 302, a bottom mounting flange 303 is arranged at the bottom of the isolation cylinder 302, the bottom mounting flange 303 and the liquid hydrogen container 6 form movable contact and are in sealing connection, and the top mounting flange 301 is fixedly and hermetically connected with a top cover 208 on the pump body; the top mounting flange 301 is provided with a through hole which is convenient for pumping the space of the inner cylinder cavity of the isolation cylinder 302 into a vacuum state; the body of the isolation cylinder 302 is provided with a vacuumizing interface which is convenient for vacuumizing the cavity space in the isolation cylinder 302, the bottom mounting flange 303 is hollow, and the bottom mounting flange 303 is provided with a through hole for communicating the inner cavity of the bottom mounting flange 303 with the cavity space in the isolation cylinder 302; and a pressure sensor or a vacuum pressure gauge is also arranged on the top mounting flange 301.
The top mounting flange 301 and the bottom mounting flange 303 may be secured to the insulating cylinder 302 by selective welding.
When the liquid hydrogen container is installed, the top installation flange 301 can be fixed with an installation flange arranged on the liquid hydrogen container 6 through bolts, the contact surface is sealed by a sealing ring, and then the bottom installation flange 303 and the liquid hydrogen container 6 are compressed and sealed through a sealing gasket; also can be used forOnly the bottom mounting flange 303 and the mounting flange arranged on the liquid hydrogen container 6 are fixed by bolts, and the contact surface is sealed by a sealing ring Sealing, and then compressing and sealing the top mounting flange 301 and the liquid hydrogen container 6 through a sealing gasket(ii) a The top mounting flange 301 and the bottom mounting flange 303 can be fixedly connected with mounting flanges carried by the liquid hydrogen container 6 through bolts, and the contact surfaces are sealed by sealing rings.
As shown in fig. 2 and 4, the separation cylinder 302 is a cylindrical installation space provided on the liquid hydrogen container 6, and a top installation flange 301 and a bottom installation flange 303 are used for fixing the separation cylinder 302. The isolating cylinder 302 is directly installed on the liquid hydrogen container 6, and the pump body 7 is directly installed in the isolating cylinder 302, so that the main functions of the isolating cylinder 302 are heat insulation and communication, wherein the heat insulation is realized through the cylinder body structure of the isolating cylinder 302, and the communication is that the pump body 7 arranged in the isolating cylinder 302 is communicated with the liquid hydrogen container 6 through the isolating valve 304 arranged at the bottom of the isolating cylinder 302.
As shown in fig. 5, the isolation valve 304 includes a valve core 3044, a valve body 3041 with an opening on the top, and a valve cover 3043, where the valve cover 3043 is fixed on the bottom mounting flange 303, the valve cover 3043 is provided with a flow port for flowing liquid hydrogen, the valve body 3041 is fixed at the bottom of the valve cover 3043 and located below the flow port, the valve body 3041 extends downward into the liquid hydrogen container, and the valve body 3041 is provided with at least one flow guide port 30411 for flowing liquid hydrogen into the valve body 3041; a cylindrical cold end bottom cover convex part 1071 is arranged on the lower side of the cold end bottom cover 107, a cold end bottom cover liquid inlet hydrogen hole 1072 is arranged on the cold end bottom cover convex part 1071, and the outer diameter of the cold end bottom cover convex part 1071 is matched with the inner diameter of a flow port on the valve cover 3043;
the valve core 3044 and the valve cover 3043 are matched to realize the following two working states: when the valve core 3044 abuts against the valve cover 3043, the flow port is blocked, and the liquid hydrogen in the liquid hydrogen container cannot be conveyed outwards;
the cold end bottom cover convex part 1071 on the lower side of the cold end bottom cover 107 is inserted into the flow port on the valve cover 3043, and the cold end bottom cover convex part 1071 is pressed against the top of the valve core 3044, so that when the valve core 3044 is not abutted against the valve cover 3043, the drainage port 30411, the cold end bottom cover liquid hydrogen inlet hole 1082 and the flow port are communicated with each other, and liquid hydrogen in the liquid hydrogen container can be normally conveyed outwards;
the valve core 3044 is a two-section stepped column with a thick upper part and a thin lower part, the thin lower half section of the valve core 3044 movably penetrates the bottom of the valve body 3041, a compression spring 3042 sleeved on the lower half section of the valve core is arranged in the valve body 3041, one end of the compression spring 3042 far away from the valve body 3041 is abutted to the upper half section of the valve core 3044, and when the compression spring 3042 is in a natural state, the compression spring 3042 presses the upper half section of the valve core 3044 to seal the flow opening on the valve cover 3043.
The valve cover 3043 and the bottom mounting flange 303 can be fixed by bolts, the valve body 3041 and the valve cover 3043 can also be fixed by bolts, and the compression spring 3042 is preferably sleeved on the valve core 3044.
The operation of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the working principle of the invention is as follows: when the high-pressure fluid power source is used, high-pressure fluid power is respectively injected into the top pipeline 209 and the bottom pipeline 210 in a reciprocating mode through the reversing valve 402, as the working states of cylinder cavities on the upper side and the lower side of the normal-temperature piston 207 are different during working, when the high-pressure fluid power is continuously injected into the top pipeline 209, the pressure intensity of the cylinder cavity on the upper side of the normal-temperature piston 207 is increased, the normal-temperature piston 207 moves downwards in order to balance the pressure intensity in the normal-temperature cylinder 205, meanwhile, the fluid in the cylinder cavity on the lower side of the normal-temperature piston 207 is discharged, the fluid can be discharged from a pipeline additionally arranged on the normal-temperature cylinder 205, and the fluid can also be discharged from a liquid discharge pipeline arranged on the three-position four-way reversing valve or the three-position five-way reversing valve; after the normal temperature piston 207 moves downwards to a certain degree, the reversing valve 402 stops injecting high-pressure fluid power into the top pipeline 209 again, the high-pressure fluid power is injected into the bottom pipeline 210 instead, the normal temperature piston 207 moves upwards again until the pressure of the cylinder cavity at the lower side of the normal temperature piston 207 is higher than the pressure of the cylinder cavity at the lower side, and meanwhile, fluid in the cylinder cavity at the upper side of the normal temperature piston 207 is discharged, and the steps are carried out in a reciprocating mode, so that the normal temperature piston 207 moves up and down in a reciprocating mode.
The normal temperature piston 207 reciprocates up and down, and simultaneously drives the cold end piston 103 to synchronously reciprocate up and down through the support rod 202.
During operation (at this time, the pump main body 7 of the liquid hydrogen pump is in a state of being completely installed), the cold end bottom cover convex portion 1071 on the lower side of the cold end bottom cover 107 of the cold end cylinder 106 is inserted into the flow port of the valve cover 3043, and the cold end bottom cover convex portion 1071 penetrates through the flow port and is pressed against the top of the valve core 3044, so that a certain gap is maintained between the valve core 3044 and the valve cover 3043, at this time, the drainage port 30411 on the valve body 3041, the cold end bottom cover liquid hydrogen inlet hole 1072 and the flow port of the valve cover 3043 are communicated with each other, and liquid hydrogen in the liquid hydrogen container 6 can be normally conveyed outwards through the drainage port 30411, the cold end bottom cover liquid hydrogen inlet hole 1072 and the flow port.
Since the liquid hydrogen in the liquid hydrogen container 6 enters the lower cavity of the cold end cylinder through the drainage port 30411, the liquid hydrogen inlet hole 1072 of the cold end bottom cover and the flow port, when the cold end piston 103 moves down under the action of the strut 202, the volume of the upper cavity of the cold end cylinder increases and the pressure decreases, and at this time, the liquid hydrogen enters the upper cavity of the cold end cylinder through the flow port and the inlet check valve 104 on the cold end piston 103 to wait for discharge. On the contrary, when the cold-end piston 103 moves upwards under the action of the strut, the volume of the upper cavity of the cold-end cylinder body is reduced, the pressure is increased, and at the moment, the liquid hydrogen enters the liquid hydrogen container outlet pipe 8 through the outlet one-way valve 102 at the top of the cold-end cylinder body 106 and is finally discharged through the liquid hydrogen container outlet pipe 8; meanwhile, the volume of the lower cavity of the cold-end cylinder body is increased, the pressure is reduced, and the liquid hydrogen continuously enters the lower cavity of the cold-end cylinder body through the circulation port.
Of course, when the liquid hydrogen pump is overhauled, the cold end cylinder 106 is drawn out at this time, the cold end bottom cover protrusion 1071 on the lower side of the cold end bottom cover 107 of the cold end cylinder 106 is no longer inserted into the flow port of the valve cover 3043, at this time, the cold end bottom cover protrusion 1071 is no longer pressed against the top of the valve core 3044, and the compression spring 3042 in the isolation valve 304 is in a state of abutting upward so that the valve core 3044 blocks the flow port of the valve cover 3043, that is, the entire isolation valve 304 is in a closed state, thereby ensuring the sealing performance of the liquid hydrogen container 6.
Because the inlet check valve 104 is arranged on the cold-end piston 103, after the high-pressure fluid power source is cut off, although the liquid hydrogen pump stops conveying the liquid hydrogen, the space below the cold-end piston 103 still retains the liquid hydrogen, so that the liquid hydrogen pump can directly work without precooling when the liquid hydrogen pump is restarted next time, and the working efficiency is effectively improved.
As shown in fig. 2, the liquid hydrogen pump of the present invention is installed in the isolation assembly 3, the cavity space between the bottom mounting flange 303 and the isolation cylinder 302 is both evacuated through the evacuation interface, and the cavity space in the isolation cylinder 302 is also evacuated through the through hole formed in the top mounting flange 301, thereby reducing the heat transfer in the isolation assembly 3, and at the same time, the liquid hydrogen pump main body 7 only has the top cover 208 located outside the isolation assembly 3, which has a small heat transfer area and extremely limited external heat absorption, so that the BOG loss in the working process can be effectively reduced; a position reserved on the top mounting flange 301 can be additionally provided with a pressure sensor to monitor the pressure in real time in the space outside the internal pump body of the isolation cylinder 302, if liquid hydrogen leaks, the pressure rise can be timely found to avoid danger, and meanwhile, the use condition of the sealing ring can be known according to the pressure change so as to be convenient for timely replacement; meanwhile, the hole formed in the top mounting flange 301 can release the trace hydrogen leaked during the disassembly and assembly of the liquid hydrogen pump in the isolation assembly 3 to the outside safely, and nitrogen purging can be performed to the inside to ensure that no oxygen remains in the inside.
Because the liquid hydrogen pump temperature is higher when normal atmospheric temperature production, and the temperature is lower in the course of the work, leads to the difference in temperature too big, consequently sets up liquid hydrogen outlet pipe 8 to encircle a 201 spiral rising behind the outlet check valve 102, avoids liquid hydrogen outlet pipe 8 to take place the shrink fracture condition under the low temperature state, establishes to the heliciform and has effectively carried out the elasticity compensation.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (5)

1. A reciprocating submerged liquid hydrogen pump capable of effectively reducing heat transfer loss is characterized by comprising the following components:
an isolation part connected with the liquid hydrogen container, wherein the isolation part completely isolates the pump main body from the liquid hydrogen container, and the pump main body is arranged in the isolation part;
a cold end of the pump body for receiving liquid hydrogen from the liquid hydrogen container and discharging the liquid hydrogen to a liquid hydrogen outlet pipe;
the power part is connected with the cold end part, the power part adopts high-pressure fluid in a power source station (4) to drive the cold end part to reciprocate, or the power part adopts a mechanical power device to remotely convey the high-pressure fluid to drive the cold end part to reciprocate, so that the discharge of liquid hydrogen is realized;
the cold end part comprises a cold end cylinder body (106), a cold end piston (103) connected with the power part through a support rod (202) is arranged in the cold end cylinder body (106), and a cold end piston sealing ring (105) used for filling a gap between the cold end piston (103) and the inner wall of the cylinder body is sleeved on the peripheral side of the cold end piston (103); an isolating valve (304) for communicating or separating a cold end cylinder body lower cavity on the lower side of the cold end piston (103) with a liquid hydrogen container is arranged on the lower side of the cold end cylinder body (106), an inlet one-way valve (104) for communicating a cold end cylinder body upper cavity on the upper side of the cold end piston (103) with the cold end cylinder body lower cavity is arranged on the cold end piston (103), and an outlet one-way valve (102) for communicating the cold end cylinder body upper cavity with a liquid hydrogen outlet pipe is arranged at the top of the cold end cylinder body (106); a cold end sealing ring (101) of the support rod is arranged at the contact part of the support rod (202) and the top of the cold end cylinder body (106);
the power part comprises a normal temperature assembly (2), a high-pressure fluid power source (401) or a power assembly (5); the normal-temperature assembly (2) comprises a normal-temperature piston (207) arranged in a normal-temperature cylinder body (205), wherein a normal-temperature piston sealing ring (206) used for filling a gap between the normal-temperature piston (207) and the inner wall of the cylinder body is sleeved on the normal-temperature piston (207); the normal temperature component (2) further comprises a normal temperature cylinder body (205) with an opening at the upper part and an opening at the lower part, a sealed top cover (208) is arranged at the opening at the upper part of the normal temperature cylinder body (205), and a sealed bottom cover (203) is arranged at the opening at the lower part; a top pipeline (209) communicated with the cylinder cavity above the normal-temperature piston (207) is arranged on the top cover (208), and a bottom pipeline (210) communicated with the cylinder cavity below the normal-temperature piston (207) is arranged on the bottom cover (203); the upper end of the strut (202) penetrates through the bottom cover (203) to be connected with a normal-temperature piston (207), a strut normal-temperature sealing ring (204) is arranged at the contact part of the strut (202) and the bottom cover (203), and the lower end of the strut (202) penetrates through the top of the cold-end cylinder body (106) to be connected with the cold-end piston (103);
the high-pressure fluid power source (401) is respectively communicated with cylinder cavities at the upper side and the lower side of the normal-temperature piston (207) through two pipelines, and the top pipeline (209) and the bottom pipeline (210) are two pipelines communicated with the high-pressure fluid power source (401); the working states of the cylinder cavities on the upper side and the lower side of the normal-temperature piston (207) are different when in work, namely when the cylinder cavity on one side of the normal-temperature piston (207) enters fluid, the cylinder cavity on the other side of the normal-temperature piston (207) discharges the fluid;
the power assembly (5) comprises a power device, a liquid cavity for storing high-pressure fluid is arranged in the power device, the power device is communicated with a cylinder cavity on the lower side of the normal-temperature piston (207) through a driving pipeline (502), and the high-pressure fluid in the liquid cavity is driven to enter the cylinder cavity on the lower side of the normal-temperature piston (206) along the driving pipeline (502), so that the normal-temperature piston (207) starts to move; the power device is a metering pump (501), a liquid cavity in the metering pump (501) is stored with high-pressure hydraulic oil, the high-pressure hydraulic oil is high-pressure fluid, and the metering pump (501) controls the high-pressure hydraulic oil in the liquid cavity to enter and exit a cylinder cavity on the lower side of the normal-temperature piston (207) through a plunger; a safety relief valve (503) is also arranged on the driving pipeline (502); the driving pipeline (502) penetrates through the top cover (208) to enter the isolation part and then is communicated with a cylinder cavity below the normal-temperature piston (207) through the bottom cover (203); the power part also comprises a pressure stabilizing component for providing power for the cold end piston (103) in the suction process; the pressure stabilizing assembly is connected with the upper end of the normal-temperature piston (207), or the pressure stabilizing assembly is communicated with a cylinder cavity on the upper side of the normal-temperature piston (207);
the isolation part is an isolation assembly (3), a groove matched with the isolation assembly (3) in shape is formed in the liquid hydrogen container, and the isolation assembly (3) is installed in the groove; the isolation assembly (3) comprises an isolation cylinder (302), and a pump body of the reciprocating submerged liquid type liquid hydrogen pump is installed in the isolation cylinder (302); the isolation assembly (3) further comprises an isolation valve (304) installed at the bottom of the isolation cylinder (302), and the isolation valve (304) is a connecting medium between the liquid hydrogen in the liquid hydrogen container and the cold end;
the isolation cylinder (302) is a double-layer sleeve with an upper opening and a lower opening, and the double-layer sleeve divides the isolation cylinder (302) into a cylinder cavity space and a cavity clamping space between the sleeves; a top mounting flange (301) is arranged at the top of the isolation cylinder (302), a bottom mounting flange (303) is arranged at the bottom of the isolation cylinder (302), the bottom mounting flange (303) and the liquid hydrogen container form movable contact and are in sealing connection, and the top mounting flange (301) is fixedly and hermetically connected with a top cover (208) on the pump body; the top mounting flange (301) is provided with a through hole which is convenient for vacuumizing the space of the inner cylinder cavity of the isolation cylinder (302); the vacuum pumping interface which is convenient for pumping the cavity space in the isolation cylinder (302) to be in a vacuum state is arranged on the cylinder body of the isolation cylinder (302), the bottom mounting flange (303) is hollow, and a through hole which is communicated with the inner cavity of the bottom mounting flange (303) and the cavity space in the isolation cylinder (302) is arranged on the bottom mounting flange (303); and a pressure sensor or a vacuum pressure gauge is further arranged on the top mounting flange (301).
2. The reciprocating submerged liquid hydrogen pump capable of effectively reducing heat transfer loss according to claim 1, characterized in that the top pipeline (209) and the bottom pipeline (210) are both connected with a high-pressure fluid power source (401) through a reversing valve (402), and the high-pressure fluid power source (401) provides high-pressure fluid power to only one of the top pipeline (209) and the bottom pipeline (210) through the reversing valve (402) at the same time, wherein the reversing valve (402) is a three-position four-way reversing valve or a three-position five-way reversing valve; the bottom pipeline (210) penetrates through the top cover (208) to enter the isolation part, and then is communicated with a cylinder cavity below the normal-temperature piston (207) through the bottom cover (203).
3. A reciprocating submerged liquid hydrogen pump effective in reducing heat transfer loss according to claim 1, characterized in that the liquid hydrogen pump has only its top cover (208) protruding outside the partition; a liquid hydrogen outlet pipe for discharging liquid hydrogen delivers the liquid hydrogen to the outside through the top cover (208).
4. A reciprocating submerged liquid hydrogen pump effective in reducing heat transfer losses according to claim 1, characterized in that the cold end is a cold end assembly (1); the cold end assembly (1) comprises a cold end cylinder body (106) with an opening at the lower part, a cold end bottom cover (107) for sealing is fixedly arranged at the opening at the lower part of the cold end cylinder body (106), and a channel connected with a valve core (3044) of the isolating valve (304) is formed in the cold end bottom cover (107);
the cold end assembly (1) and the normal temperature assembly (2) are fixedly connected through a support cylinder (201), and the support rod (202) penetrates through the support cylinder (201); the liquid hydrogen outlet pipe spirals up around the branch pipe (201).
5. The reciprocating submerged type liquid hydrogen pump capable of effectively reducing the heat transfer loss according to claim 4, characterized in that the isolation valve (304) comprises a valve core (3044), a valve body (3041) and a valve cover (3043), wherein the valve body (3041) is open at the top, the valve cover (3043) is fixed on a bottom mounting flange (303), the valve cover (3043) is provided with a flow opening for liquid hydrogen to flow through, the valve body (3041) is fixed at the bottom of the valve cover (3043) and is located below the flow opening, the valve body (3041) extends downwards into the liquid hydrogen container, and the valve body (3041) is provided with at least one flow guide opening (30411) for liquid hydrogen to flow into the valve body (3041); a cylindrical cold end bottom cover convex part (1071) is arranged on the lower side of the cold end bottom cover (107), a cold end bottom cover liquid inlet hydrogen hole (1072) is formed in the cold end bottom cover convex part (1071), and the outer diameter of the cold end bottom cover convex part (1071) is matched with the inner diameter of a flow port on the valve cover (3043);
the valve core (3044) and the valve cover (3043) are matched to realize the following two working states: when the valve core (3044) is abutted against the valve cover (3043), the flow port is blocked, and liquid hydrogen in the liquid hydrogen container cannot be conveyed outwards;
a cold end bottom cover convex part (1071) on the lower side of the cold end bottom cover (107) is inserted into the circulation port on the valve cover (3043), and the cold end bottom cover convex part (1071) is pressed on the top of the valve core (3044), so that when the valve core (3044) is not abutted to the valve cover (3043), the drainage port (30411), the cold end bottom cover liquid hydrogen inlet hole (1072) and the circulation port are communicated with each other, and liquid hydrogen in the liquid hydrogen container can be normally conveyed outwards;
the valve core (3044) is a two-section stepped column with a thick upper part and a thin lower part, the thin lower half section of the valve core (3044) movably penetrates through the bottom of the valve body (3041), a compression spring (3042) sleeved on the lower half section of the valve core is arranged in the valve body (3041), one end, far away from the valve body (3041), of the compression spring (3042 is abutted to the upper half section of the valve core (3044), and when the compression spring (3042) is in a natural state, the compression spring (3042) presses the upper half section of the valve core (3044) to seal a flow port on the valve cover (3043).
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