CN111594412B - Reciprocating submerged liquid hydrogen pump - Google Patents
Reciprocating submerged liquid hydrogen pump Download PDFInfo
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- CN111594412B CN111594412B CN202010391062.5A CN202010391062A CN111594412B CN 111594412 B CN111594412 B CN 111594412B CN 202010391062 A CN202010391062 A CN 202010391062A CN 111594412 B CN111594412 B CN 111594412B
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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
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/06—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for evacuating by thermal means
- F04B37/08—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for evacuating by thermal means by condensing or freezing, e.g. cryogenic pumps
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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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
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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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
- F04B39/1013—Adaptations or arrangements of distribution members the members being of the poppet valve type
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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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
- F04B39/102—Adaptations or arrangements of distribution members the members being disc valves
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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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/121—Casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/01—Propulsion of the fluid
- F17C2227/0128—Propulsion of the fluid with pumps or compressors
- F17C2227/0135—Pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/45—Hydrogen technologies in production processes
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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 liquid hydrogen pump which 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; and the power part is connected with the cold end part, and the power part adopts high-pressure fluid to drive the cold end part to reciprocate so as to realize the discharge of liquid hydrogen. The invention cancels the reciprocating pump structure that the traditional motor directly drives the cold end piston to reciprocate through the crank connecting rod mechanism, and changes the structure into the structure that the high-pressure fluid remotely transmits power, namely, the high-pressure fluid power source provides power for the normal temperature assembly, and 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, thereby being safer and quicker compared with the electric structure of the traditional crank connecting rod in the operation process.
Description
Technical Field
The invention relates to the field of liquid hydrogen energy, in particular to a reciprocating submerged liquid hydrogen pump.
Background
Liquid hydrogen (LH 2) is a high-energy and ultralow-temperature liquid clean fuel, compared with gas hydrogen and metal hydride, the liquid hydrogen has incomparable advantages in terms of energy storage density and transportation cost, the development space is wider, 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 after gas is liquefied under the critical temperature through 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), air pollution is caused, and the cost is increased. In LNG storage and transportation, an electric centrifugal pump completely latent in liquid exists, but the problem of motor liquid immersion cannot be solved because the liquid hydrogen temperature (-253 ℃) is far lower than that of LNG (-169 ℃), so that the solution is needed.
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. The invention can drive the normal-temperature piston through the high-pressure fluid to drive the cold end to reciprocate, thereby completing the conveying process of the liquid hydrogen, canceling the pre-cooling step before work, effectively reducing the BOG loss in the work process and ensuring the work process to be safer.
In order to achieve the purpose, the invention provides the following technical scheme:
the reciprocating submerged liquid hydrogen pump 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;
and the power part is connected with the cold end part, and the power part adopts high-pressure fluid in the power source station to drive the cold end part to reciprocate so as to realize the discharge of liquid hydrogen.
As a further scheme of the invention: 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 during working, namely when fluid enters the cylinder cavity on one side of the normal-temperature piston, the fluid is discharged from the cylinder cavity on the other side of the normal-temperature piston; the reciprocating submerged liquid hydrogen pump further comprises a support rod fixedly connected with the normal-temperature piston, and one end, far away from the normal-temperature piston, of the support rod is connected with the cold end.
As a still further scheme of the invention: 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 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.
As a still further scheme of the invention: the top pipeline and the bottom pipeline are both connected with a high-pressure fluid power source through reversing valves, the high-pressure fluid power source only provides high-pressure fluid power for one of the top pipeline and the bottom pipeline through the reversing valves at the same time, and the reversing valves are three-position four-way reversing valves or three-position five-way reversing valves.
As a still further scheme of the invention: the liquid hydrogen pump only has a top cover extending out of the isolation assembly, the bottom pipeline penetrates through the top cover to enter the isolation assembly, and then 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.
As a still further scheme of the invention: 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, a cold end piston connected with a normal temperature piston through a support rod is arranged in the cold end cylinder body, and a cold end piston sealing ring for filling a gap between the cold end piston and the inner wall of the cylinder body is sleeved on the cold end piston; the cold end assembly further comprises an inlet one-way valve used for communicating the inner cavity of the cold end cylinder body with the liquid hydrogen container, and an outlet one-way valve used for communicating the inner cavity of the cold end cylinder body with the liquid hydrogen outlet pipe.
As a still further scheme of the invention: 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; the inlet one-way valve is installed on the cold end bottom cover, and the outlet one-way valve is installed on the cold end bottom cover or the bottom of the cylinder wall of the cold end cylinder body.
As a still further scheme of the invention: the isolating part is an isolating assembly, a groove matched with the shape of the isolating assembly is formed in the liquid hydrogen container, and the isolating assembly is installed in the groove; the isolation assembly comprises an isolation cylinder, and the pump main body is arranged in the isolation cylinder; the isolation assembly further comprises an isolation valve arranged at the bottom of the isolation cylinder, the isolation valve is arranged in the liquid hydrogen container in a penetrating mode and communicated with the liquid hydrogen, and the isolation valve is a connecting medium between the liquid hydrogen in the liquid hydrogen container and the cold end.
As a still further scheme of the invention: the isolation cylinder is a double-layer sleeve with an upper opening and a lower opening, 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 is fixedly and hermetically connected with the liquid hydrogen container, and the top mounting flange is fixedly and hermetically connected with a top cover on the pump main 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 isolation cylinder body is provided with a vacuumizing interface which is convenient for vacuumizing the space of the inner clamping cavity of the isolation cylinder, the bottom mounting flange is hollow, and the bottom mounting flange is provided with a through hole communicated with the space of the inner clamping cavity of the isolation cylinder; and the top mounting flange is also provided with a pressure sensor.
As a still further scheme of the invention: the isolating valve comprises a valve core, a valve body and a valve cover, wherein the valve body is in an upper opening shape, the valve cover is fixed on a 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 is arranged in 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; the valve core and the valve cover are matched to realize the following two working states: or when the valve core is abutted against the valve cover, the flow port is blocked, and the liquid hydrogen in the liquid hydrogen container cannot be conveyed outwards; or when the valve core is not abutted to the valve cover, the circulation port is opened, and the liquid hydrogen in the liquid hydrogen container can be normally conveyed outwards; the valve core is thick two-section ladder column form down, the valve core is mobilizable wearing to locate the valve body bottom in the half section down, compression spring is installed to the bottom in the valve body, compression spring keeps away from the one end butt of valve body to the first half of valve core, when compression spring is in natural state, compression spring oppresses the first half of valve core and makes its shutoff hole of circulation on the valve gap.
Compared with the prior art, the invention has the beneficial effects that:
1. when the reciprocating pump device 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 cancelled, and the reciprocating pump device is changed into a submerged liquid hydrogen reciprocating pump device that power is transmitted remotely through high-pressure fluid, 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; in the reciprocating motion process, under the action of pressure difference, 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 conveying of the liquid hydrogen; the design that the inlet one-way valve and the outlet one-way valve are positioned at the bottom of the cold end cylinder body prevents residual liquid at the bottom in the cold end cylinder body from being discharged effectively in the working process, and improves the discharge efficiency of liquid hydrogen; after the high-pressure fluid power source is cut off, the liquid hydrogen pump stops conveying the liquid hydrogen, at the moment, the space below the cold end piston still retains the liquid hydrogen, and when the liquid hydrogen pump is restarted next time, the liquid hydrogen pump can directly work without a precooling step.
2. When the high-pressure fluid cylinder 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 the liquid discharge pipeline on the reversing valve can effectively discharge the fluid discharged from the 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.
3. When the liquid hydrogen pump is used, the liquid hydrogen pump is arranged in the isolation assembly, after the liquid hydrogen pump is installed, the inlet one-way valve of the liquid hydrogen pump jacks the valve cover, a downward force is applied to the valve cover, so that the compression spring is contracted, the valve core moves downwards, the flow port on the valve cover is exposed, the isolation valve is changed into an open state, the inlet one-way valve is communicated with the inner space of the isolation valve, a conveying channel between the cold end part and the liquid hydrogen container is established, the liquid hydrogen can directly contact the inlet one-way valve in the isolation valve, and the preparation for conveying the liquid hydrogen is made; when the liquid hydrogen pump needs to be dismantled for maintenance, the compression spring is not subjected to downward pressure and recovers to a natural telescopic state, the valve core is pushed to seal the flow port of the valve cover, and the isolation valve is changed into a closed state at the moment so that liquid hydrogen in the liquid hydrogen container is isolated from the outside again.
4. 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 main 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 main 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.
5. When the spiral 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 check valve, the situation that the liquid hydrogen outlet pipe is contracted and broken in an over-low-temperature state is avoided, and elastic compensation is effectively carried out in a spiral mode.
Drawings
Fig. 1 is a schematic view of the installation of a reciprocating submerged liquid hydrogen pump in a liquid hydrogen container.
Fig. 2 is a schematic structural view of a reciprocating submerged liquid hydrogen pump.
Fig. 3 is a schematic structural diagram of an isolation valve in a reciprocating submerged liquid hydrogen pump.
In the figure: 1. a cold end assembly; 2. a normal temperature component; 3. an isolation component; 4. a power source station; 101. a cold end piston; 102. a cold end piston seal ring; 103. a cold end cylinder; 104. an outlet check valve; 105. a cold end bottom cover; 106. an inlet check valve; 201. supporting a cylinder; 202. a strut; 203. a bottom cover; 204. a normal-temperature cylinder body; 205. a normal temperature piston seal ring; 206. a piston at normal temperature; 207. a top cover; 208. a top pipeline; 209. a bottom pipeline; 301. a flange is arranged at the top; 302. an isolation cylinder; 303. a bottom mounting flange; 304. an isolation valve; 3041. a valve body; 3042. a compression spring; 3043. a valve cover; 3044. a valve core; 401. a high pressure fluid power source; 402. a reversing valve.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 3, in an embodiment of the present invention, a reciprocating submerged liquid hydrogen pump is characterized in that the reciprocating submerged liquid hydrogen pump includes the following components:
the isolating part is connected with the liquid hydrogen container, the isolating part completely isolates the pump main body from the liquid hydrogen container, and the pump main body is arranged in the isolating 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;
and the power part is connected with the cold end part, and the power part adopts high-pressure fluid in the power source station 4 to drive the cold end part to reciprocate so as to realize the discharge of liquid hydrogen.
The power part comprises a normal temperature component 2 and a high-pressure fluid power source 401; the normal temperature assembly 2 comprises a normal temperature piston 206 arranged in a normal temperature cylinder 204, wherein a normal temperature piston sealing ring 205 used for filling a gap between the normal temperature piston 206 and the inner wall of the cylinder is sleeved on the normal temperature piston 206; 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 206 through two pipelines; the cylinder cavities on the upper and lower sides of the normal temperature piston 206 are different in working state when working, that is, when fluid enters the cylinder cavity on one side of the normal temperature piston 206, the cylinder cavity on the other side of the normal temperature piston 206 discharges the fluid; the reciprocating submerged liquid hydrogen pump further comprises a support rod 202 fixedly connected with the normal-temperature piston 206, and one end, far away from the normal-temperature piston 206, of the support rod 202 is connected with the cold end.
The normal temperature component 2 comprises a normal temperature cylinder body 204 with an opening at the upper part and the lower part, a sealed top cover 207 is arranged at the opening at the upper part of the normal temperature cylinder body 204, and a sealed bottom cover 203 is arranged at the opening at the lower part; the top cover 207 is provided with a top pipeline 208 communicated with a cylinder cavity above the normal-temperature piston 206, the bottom cover 203 is provided with a bottom pipeline 209 communicated with the cylinder cavity below the normal-temperature piston 206, and the top pipeline 208 and the bottom pipeline 209 are two pipelines communicated with the high-pressure fluid power source 401.
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 208 and the bottom pipeline 209 are both connected with a high-pressure fluid power source 401 through a reversing valve 402, the high-pressure fluid power source 401 only provides high-pressure fluid power for one of the top pipeline 208 and the bottom pipeline 209 through the reversing valve 402 at the same time, 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 207 extending out of the isolation assembly 3, the bottom pipeline 209 penetrates through the top cover 207 to enter the isolation assembly 3, and then is communicated with a cylinder cavity below the normal temperature piston 206 through the bottom cover 203; a liquid hydrogen outlet pipe for discharging liquid hydrogen passes through the top cover 207 to deliver the liquid hydrogen to the outside.
The cold end part is a cold end component 1; the cold end component 1 comprises a cold end cylinder 103 with an opening at the lower part, a cold end bottom cover 105 for sealing is fixedly arranged at the opening at the lower part of the cold end cylinder 103, a cold end piston 101 connected with a normal temperature piston 206 through a strut 202 is arranged in the cold end cylinder 103, and a cold end piston sealing ring 102 for filling a gap between the cold end piston 101 and the inner wall of the cylinder is sleeved on the cold end piston 101; the cold end assembly 1 further comprises an inlet one-way valve 106 for communicating the inner cavity of the cold end cylinder 103 with a liquid hydrogen container, and an outlet one-way valve 104 for communicating the inner cavity of the cold end cylinder 103 with a liquid hydrogen outlet pipe.
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; the inlet check valve 106 is mounted on the cold end bottom cover 105, and the outlet check valve 104 is mounted on the cold end bottom cover 105 or the bottom of the cylinder wall of the cold end cylinder 103.
The isolating part is an isolating component 3, a groove matched with the shape of the isolating component 3 is formed in the liquid hydrogen container, and the isolating component 3 is installed in the groove; the isolation assembly 3 comprises an isolation cylinder 302, and the pump body 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, the isolation valve 304 is arranged in the liquid hydrogen container in a penetrating manner and communicated with the liquid hydrogen, and the isolation valve 304 is a connection 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 is fixedly and hermetically connected with the liquid hydrogen container, and the top mounting flange 301 is fixedly and hermetically connected with a top cover 207 on the pump main 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 communicated with the cavity space in the isolation cylinder 302; and a pressure sensor 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 installation is carried out, the top installation flange 301 can be fixed with an installation flange arranged on the liquid hydrogen container through bolts, the contact surface is sealed by a sealing ring, and then the bottom installation flange 303 and the liquid hydrogen container are compressed and sealed through a sealing gasket; or only fixing the bottom mounting flange 303 and the mounting flange on the liquid hydrogen container by bolts, sealing the contact surface by a sealing ring, and then pressing and sealing the top mounting flange 301 and the liquid hydrogen container by a sealing gasket; the top mounting flange 301 and the bottom mounting flange 303 can be fixedly connected with mounting flanges carried on the liquid hydrogen container through bolts, and the contact surfaces are sealed by sealing rings.
The isolation valve 304 comprises a valve core 3044, a valve body 3041 with an opening shape on the upper side and a valve cover 3043, the valve cover 3043 is fixed on the bottom mounting flange 303, a flow opening for supplying liquid hydrogen to flow is formed in the valve cover 3043, the valve body 3041 is fixedly arranged at the bottom of the valve cover 3043 and is positioned below the flow opening, the valve body 3041 is arranged in a liquid hydrogen container, and at least one drainage opening for supplying liquid hydrogen to flow into the valve body 3041 is formed in the valve body 3041; the valve core 3044 and the valve cover 3043 are matched to realize the following two working states: or 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; or when the valve core 3044 is not abutted against the valve cover 3043, the flow port is opened, and the 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 lower half section of the valve core 3044 movably penetrates through the bottom of the valve body 3041, a compression spring 3042 is installed at the bottom in the valve body 3041, one end of the compression spring 3042, which is far away from the valve body 3041, abuts against the upper half part of the valve core 3044, and when the compression spring 3042 is in a natural state, the compression spring 3042 presses the upper half part 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 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 208 and the bottom pipeline 209 in a reciprocating mode through the reversing valve 402, the working states of cylinder cavities on the upper side and the lower side of the normal-temperature piston 206 are different when working, when the high-pressure fluid power is continuously injected into the top pipeline 208, the pressure intensity of the cylinder cavity on the upper side of the normal-temperature piston 206 is increased, the normal-temperature piston 206 moves downwards in order to balance the pressure intensity in the normal-temperature cylinder 204, meanwhile, the fluid in the cylinder cavity on the lower side of the normal-temperature piston 206 is discharged, the fluid can be discharged from a pipeline additionally arranged on the normal-temperature cylinder 204, 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 206 moves downwards to a certain degree, the reversing valve 402 stops injecting high pressure fluid power into the top pipeline 208, the high pressure fluid power is injected into the bottom pipeline 209 instead, until the pressure of the cylinder cavity at the lower side of the normal temperature piston 206 is higher than the pressure of the cylinder cavity at the lower side, the normal temperature piston 206 moves upwards again, and simultaneously the fluid in the cylinder cavity at the upper side of the normal temperature piston 206 is discharged, the steps are carried out in a reciprocating manner, so that the normal temperature piston 206 moves up and down in a reciprocating manner, the cold end piston 101 is driven by the support rod 202 to move up and down in a reciprocating manner synchronously, when the cold end piston 101 moves upwards, the pressure of the space below the cold end piston 101 is lower than that of the space above, in order to balance the pressure, the liquid hydrogen outside the inlet one-way valve 106 enters the cold end cylinder 103 through the inlet one-way valve 106, when the cold end piston 101 moves downwards, because the inlet one-way valve 106 is a one-way channel, liquid hydrogen in the cold end cylinder body 103 can only be discharged from the outlet one-way valve 104 through the liquid hydrogen outlet pipe, and the process of conveying the liquid hydrogen in the liquid hydrogen container outwards is completed; after the high-pressure fluid power source is cut off, the liquid hydrogen pump stops conveying the liquid hydrogen, the space below the cold end piston 101 still retains the liquid hydrogen at the moment, and when the liquid hydrogen pump is restarted next time, the liquid hydrogen pump can directly work without a pre-cooling step.
The liquid hydrogen pump is installed in the isolation assembly 3, after the installation is completed, the inlet one-way valve 106 of the liquid hydrogen pump jacks the valve cover 3043, a downward force is applied to the valve cover 3043, so that the compression spring 3042 is contracted, the valve core 3044 moves downward, the flow port on the valve cover 3043 is exposed, the isolation valve 304 is changed into an open state, the inner spaces of the inlet one-way valve 106 and the isolation valve 304 are communicated, a conveying channel between a cold end and a liquid hydrogen container is established, and liquid hydrogen can directly contact the inlet one-way valve 106 in the isolation valve 304 to prepare for conveying the liquid hydrogen; when the liquid hydrogen pump needs to be disassembled for maintenance, the compression spring 3042 is not pressed downward and is restored to a natural telescopic state, the valve core 3044 is pushed to seal the flow opening of the valve cover 3043, and the isolation valve 304 is turned into a closed state at the moment, so that the liquid hydrogen in the liquid hydrogen container is isolated from the outside again.
Because the liquid hydrogen pump is installed in the isolation assembly 3, the cavity clamping spaces of the bottom mounting flange 303 and the isolation cylinder 302 are both vacuumized through the vacuumizing interface, and meanwhile, the cavity space of the inner cylinder of the isolation cylinder 302 is also vacuumized through the through hole formed in the top mounting flange 301, the heat transfer in the isolation assembly 3 is reduced, and meanwhile, only the top cover 207 of the liquid hydrogen pump main body is positioned on the outer side of the isolation assembly 3, the heat transfer area is small, and the absorption of external heat is extremely limited, 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 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 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 the liquid hydrogen outlet pipe into and encircles a section of thick bamboo 201 spiral rising behind the through export check valve 104, avoids the liquid hydrogen outlet pipe to take place the shrink fracture condition under the low temperature state, establishes to the heliciform and has effectively carried out the elastic 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 (7)
1. A reciprocating submerged liquid hydrogen pump 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 and drives the cold end part to reciprocate by adopting high-pressure fluid in the power source station (4) so as to realize the discharge of liquid hydrogen;
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, and the isolating assembly (3) is arranged in the groove; the isolation assembly (3) comprises an isolation cylinder (302), the pump body being mounted within the isolation cylinder (302); the isolation assembly (3) further comprises an isolation valve (304) installed at the bottom of the isolation cylinder (302), the isolation valve (304) is arranged in the liquid hydrogen container in a penetrating mode and communicated with the liquid hydrogen, 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 opening at the upper part and the lower part, 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) is fixedly and hermetically connected with the liquid hydrogen container, and the top mounting flange (301) is fixedly and hermetically connected with a top cover (207) on the pump main 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 space of the inner clamping cavity of 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 communicated with the space of the inner clamping cavity of the isolation cylinder (302) is arranged on the bottom mounting flange (303); a pressure sensor is also arranged on the top mounting flange (301);
the isolation valve (304) comprises a valve core (3044), a valve body (3041) and a valve cover (3043), wherein the upper part of the valve body (3041) is open, the valve cover (3043) is fixed on the bottom mounting flange (303), a flow opening for liquid hydrogen to flow is formed in the valve cover (3043), the valve body (3041) is fixedly arranged at the bottom of the valve cover (3043) and is positioned below the flow opening, the valve body (3041) is arranged in a liquid hydrogen container, and at least one drainage opening for liquid hydrogen to flow into the valve body (3041) is formed in the valve body (3041); the valve core (3044) and the valve cover (3043) are matched to realize the following two working states: or when the valve core (3044) is abutted against the valve cover (3043), the flow port is blocked, and the liquid hydrogen in the liquid hydrogen container cannot be conveyed outwards; or when the valve core (3044) is not abutted to the valve cover (3043), the flow port is opened, and the 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 lower half section of the valve core (3044) is movably arranged at the bottom of the valve body (3041) in a penetrating manner, a compression spring (3042) is arranged at the bottom 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 part of the valve core (3044), and when the compression spring (3042) is in a natural state, the compression spring (3042) presses the upper half part of the valve core (3044) to seal a flow opening on the valve cover (3043).
2. A reciprocating submerged liquid hydrogen pump according to claim 1, characterized in that the power section comprises a cold pack (2) and a high pressure fluid power source (401); the normal-temperature assembly (2) comprises a normal-temperature piston (206) arranged in a normal-temperature cylinder body (204), wherein a normal-temperature piston sealing ring (205) used for filling a gap between the normal-temperature piston (206) and the inner wall of the cylinder body is sleeved on the normal-temperature piston (206); 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 (206) through two pipelines; the working states of the cylinder cavities on the upper side and the lower side of the normal-temperature piston (206) are different when in work, namely when the cylinder cavity on one side of the normal-temperature piston (206) enters fluid, the cylinder cavity on the other side of the normal-temperature piston (206) discharges the fluid; the reciprocating submerged liquid hydrogen pump further comprises a support rod (202) fixedly connected with the normal-temperature piston (206), and one end, far away from the normal-temperature piston (206), of the support rod (202) is connected with the cold end.
3. The reciprocating submerged type liquid hydrogen pump according to claim 2, wherein the normal temperature assembly (2) comprises a normal temperature cylinder body (204) with an opening at the upper part and an opening at the lower part, a sealed top cover (207) is arranged at the opening at the upper part of the normal temperature cylinder body (204), and a sealed bottom cover (203) is arranged at the opening at the lower part; the high-pressure fluid power source is characterized in that a top pipeline (208) communicated with a cylinder cavity above the normal-temperature piston (206) is arranged on the top cover (207), a bottom pipeline (209) communicated with the cylinder cavity below the normal-temperature piston (206) is arranged on the bottom cover (203), and the top pipeline (208) and the bottom pipeline (209) are two pipelines communicated with the high-pressure fluid power source (401).
4. A reciprocating submerged liquid hydrogen pump according to claim 3, characterized in that the top pipe (208) and the bottom pipe (209) are both connected to the high pressure fluid power source (401) through a change valve (402), and the high pressure fluid power source (401) provides high pressure fluid power to only one of the top pipe (208) and the bottom pipe (209) through the change valve (402) at the same time, and the change valve (402) is a three-position four-way change valve or a three-position five-way change valve.
5. A reciprocating submerged liquid hydrogen pump according to claim 3, characterized in that the liquid hydrogen pump only has its top cover (207) extending outside the isolation assembly (3), and the bottom pipe (209) passes through the top cover (207) into the isolation assembly (3) and communicates with the cylinder cavity below the ambient temperature piston (206) through the bottom cover (203); and a liquid hydrogen outlet pipe for discharging the liquid hydrogen transmits the liquid hydrogen to the outside through the top cover (207).
6. A reciprocating submerged liquid hydrogen pump according to claim 2, characterized in that the cold end is a cold end assembly (1); the cold end assembly (1) comprises a cold end cylinder body (103) with an opening at the lower part, a cold end bottom cover (105) for sealing is fixedly arranged at the opening at the lower part of the cold end cylinder body (103), a cold end piston (101) connected with a normal temperature piston (206) through a support rod (202) is arranged in the cold end cylinder body (103), and a cold end piston sealing ring (102) for filling a gap between the cold end piston (101) and the inner wall of the cylinder body is sleeved on the cold end piston (101); the cold end assembly (1) further comprises an inlet one-way valve (106) used for communicating the inner cavity of the cold end cylinder body (103) with the liquid hydrogen container, and an outlet one-way valve (104) used for communicating the inner cavity of the cold end cylinder body (103) with the liquid hydrogen outlet pipe.
7. The reciprocating submerged type liquid hydrogen pump according to claim 6, characterized in that the cold end component (1) and the normal temperature component (2) are fixedly connected through a support tube (201), and the support rod (202) is arranged in the support tube (201) in a penetrating manner; the liquid hydrogen outlet pipe spirally rises around the branch cylinder (201); the inlet check valve (106) is installed on a cold end bottom cover (105), and the outlet check valve (104) is installed on the cold end bottom cover (105) or the bottom of the cylinder wall of the cold end cylinder body (103).
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| CN202010391062.5A CN111594412B (en) | 2020-05-11 | 2020-05-11 | Reciprocating submerged liquid hydrogen pump |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042188A (en) * | 2009-10-21 | 2011-05-04 | 中国科学院理化技术研究所 | Low-temperature liquid hydrogen pump and use thereof |
| CN104279135A (en) * | 2013-07-11 | 2015-01-14 | 西港能源有限公司 | Low-pressure and low-temperature pump assembly |
| CN109073155A (en) * | 2016-01-29 | 2018-12-21 | 克里奥斯塔股份有限公司 | For distributing the external member of liquefied gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2326747Y (en) * | 1998-05-22 | 1999-06-30 | 武新民 | Synchronous reciprocating gas/liquid pump for steam engine |
| CN100567730C (en) * | 2007-06-21 | 2009-12-09 | 吕权 | Hydraulic drive fluid pump |
| CN104564711B (en) * | 2015-01-19 | 2016-08-24 | 江苏省特种设备安全监督检验研究院无锡分院 | Liquefied natural gas conveying latent liquid type double go out magnetic force driving pump |
| CA2886538C (en) * | 2015-03-27 | 2023-05-09 | Kamal HATAMI AGHDAM | Cryogenic tank assembly with a pump drive unit disposed within fluid storage vessel |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042188A (en) * | 2009-10-21 | 2011-05-04 | 中国科学院理化技术研究所 | Low-temperature liquid hydrogen pump and use thereof |
| CN104279135A (en) * | 2013-07-11 | 2015-01-14 | 西港能源有限公司 | Low-pressure and low-temperature pump assembly |
| CN109073155A (en) * | 2016-01-29 | 2018-12-21 | 克里奥斯塔股份有限公司 | For distributing the external member of liquefied gas |
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