CN113790295A - Pressure reducing valve and pressure reducing method for liquid hydrogen - Google Patents
Pressure reducing valve and pressure reducing method for liquid hydrogen Download PDFInfo
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- CN113790295A CN113790295A CN202111061317.2A CN202111061317A CN113790295A CN 113790295 A CN113790295 A CN 113790295A CN 202111061317 A CN202111061317 A CN 202111061317A CN 113790295 A CN113790295 A CN 113790295A
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- liquid hydrogen
- spring
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 147
- 239000001257 hydrogen Substances 0.000 title claims abstract description 123
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 123
- 239000007788 liquid Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims description 8
- 238000007789 sealing Methods 0.000 claims abstract description 78
- 230000001105 regulatory effect Effects 0.000 claims abstract description 48
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 6
- 230000006835 compression Effects 0.000 claims description 18
- 238000007906 compression Methods 0.000 claims description 18
- 230000009471 action Effects 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 11
- 230000008602 contraction Effects 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 238000011161 development Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
-
- 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
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a pressure reducing valve for liquid hydrogen, which relates to the technical field of pressure reducing valves and comprises the following components: valve body, piston, pressure regulating main seal, valve gap, spring. Through the pressure value of preset spring for when high-pressure hydrogen is higher than the pressure value of spring, promote the piston and drive pressure regulating main seal rebound, open the valve export of valve body, make hydrogen gas pass through from the valve intracavity, use in advance in the automobile use equipment that the port links to each other behind the flow direction and the valve, just so can stabilize pipeline pressure, be unlikely to the relief valve and discharge, cause the air supply extravagant. In addition, the piston adopts the first sealing element and the second sealing element to carry out double sealing, and the elastic ring is coated in the second sealing element, so that low-temperature compensation can be realized, the sealing performance is stronger, dynamic following can be carried out when the piston deflects, and dynamic sealing is realized.
Description
Technical Field
The invention relates to the technical field of pressure reducing valves, in particular to a pressure reducing valve for liquid hydrogen.
Background
With the gradual depletion of traditional fossil fuel energy, the concentration of greenhouse gases rapidly rises, and the global warming situation is intensified. The development and utilization of clean energy has become an important direction for the development of countries around the world. The hydrogen has the characteristics of rich reserves, high heat value, cleanness, high efficiency and the like, can simultaneously meet the requirements of resources, environment and sustainable development, and is one of important ways for solving the problems of energy supply and environment. Hydrogen is regarded as a "future energy source" in many countries suffering from environmental troubles, and development and utilization of hydrogen are becoming major strategic directions for energy transformation in the world.
At present, hydrogen is the most abundant and clean energy stored in the world, is the best fuel of a fuel cell, and is regarded and vigorously developed by various countries as a new energy in the automobile industry due to abundant resources, high efficiency and environmental protection.
At present, the vehicle-mounted hydrogen storage bottle is mainly used for storing hydrogen under high pressure, and if the hydrogen density is relatively low, a hydrogen fuel vehicle needs to be loaded with a plurality of hydrogen bottles during the endurance, so that the load is relatively reduced; and if the relative density of the liquid hydrogen is higher, a plurality of hydrogen bottles are not needed.
The liquid hydrogen bottle for high-pressure hydrogen storage has a certain vacuum rate, liquid hydrogen can be continuously gasified, the gasification rate is determined by the heat preservation capacity, and therefore the pressure in the bottle can be increased after the liquid hydrogen is gasified, and then the safety valve is triggered to discharge when the threshold value is reached, so that the liquid hydrogen bottle is protected. However, if the hydrogen is directly discharged through the safety valve, the discharged hydrogen is wasted, and a large economic pressure is caused.
Disclosure of Invention
One of the purposes of the invention is to solve the problem that in the prior art, the pressure in a bottle is increased after liquid hydrogen is gasified, so that the safety valve is triggered to discharge, and energy is wasted.
Another object of the present invention is to provide a method for reducing pressure of liquid hydrogen.
In order to achieve one of the purposes, the invention adopts the following technical scheme: a pressure reducing valve for liquid hydrogen, comprising: valve body, piston, pressure regulating main seal, valve gap, spring.
The valve body has: valve inlet, valve cavity, valve outlet, valve rear port. The valve inlet is used for being connected with a liquid hydrogen bottle, the valve cavity is communicated with the valve inlet, the valve outlet is communicated with the valve cavity, the valve rear port is communicated with the valve outlet, and the valve rear port is used for connecting a pipeline.
The piston is slidably mounted in the valve cavity. The pressure regulating main seal is connected with the piston, and the pressure regulating main seal blocks the communication between the valve cavity and the valve outlet.
The valve cover is arranged on the sealing cavity, a stroke distance is reserved between the valve cover and the piston, and the piston can slide up and down in the valve cavity relative to the valve cover through the stroke distance so as to control the flow of hydrogen through the valve cavity.
The spring is arranged between the piston and the valve cover, and the compression amount of the spring sets a pressure value required after the liquid hydrogen bottle is decompressed.
In the above technical solution, in the embodiment of the present invention, before use, the compression amount of the spring between the piston and the valve cover is adjusted, the compression amount of the spring is set to a pressure value required after the pressure of the liquid hydrogen bottle is reduced, and the set pressure of the pressure reducing valve for liquid hydrogen is determined by adjusting the force value design and the compression amount of the spring.
When the device is used, the valve inlet of the valve body is connected with the liquid hydrogen bottle, and the valve outlet of the valve body is connected with the using equipment of the automobile.
After liquid hydrogen in the liquid hydrogen bottle is gasified, and the pressure of the gasified high-pressure hydrogen is greater than the pressure value set by the spring, the piston is pushed to slide upwards along the valve cavity of the valve body, the spring is compressed, so that the upper and lower spring forces acting on the spring are offset, and as the piston moves upwards, the pressure regulating main seal below the piston is driven by the piston to move upwards, so that the communication between the valve cavity and the valve outlet is opened, the high-pressure hydrogen enters the valve cavity from the valve inlet, enters the valve outlet from the valve cavity, finally enters the valve rear port from the valve outlet, and the high-pressure hydrogen flows to the use equipment of the automobile through a pipeline to be used in advance.
After the pressure of the gasified high-pressure hydrogen is reduced and still greater than the set pressure value of the spring, the piston is pushed downwards under the action of the spring, and the gap between the pressure regulating main seal and the valve outlet is reduced, so that the flow resistance of the hydrogen gas is reduced, and the pressure of the hydrogen gas is increased; and after the pressure of the gasified high-pressure hydrogen becomes large, the piston drives the pressure regulating main seal to move upwards, the gap between the pressure regulating main seal and the valve outlet is increased, the flow resistance of the hydrogen gas is increased, the pressure of the hydrogen gas is reduced at the same time, and the operation is repeated in cycles, so that the aim of stabilizing the pressure of the hydrogen gas in the liquid hydrogen bottle is fulfilled.
Further, in the embodiment of the present invention, the pipeline is communicated with a container through which the discharged hydrogen gas is collected, and the container has a connection port through which a check valve is provided for connection with a use device of an automobile.
Furthermore, in the embodiment of the present invention, the pressure regulating main seal is an elastic sealing member, and a contact end of a bottom of the pressure regulating main seal with the valve outlet is conical, so as to enhance sealing of the valve outlet by the conical pressure regulating main seal.
Further, in the embodiment of the present invention, the outer surface of the piston is sleeved with a first sealing element and a second sealing element, and the piston is sealed by the first sealing element and the second sealing element when in motion and at rest.
Furthermore, in the embodiment of the present invention, the piston has an outward flange at the upper end, a retaining ring is disposed on the lower surface of the flange, and the second sealing ring is in close contact with the retaining ring.
Furthermore, in the embodiment of the present invention, the second sealing element is fixed on the outer surface of the piston or on the sidewall of the valve cavity, the second sealing element is in close contact with the piston along the circumferential direction of the piston, an elastic ring is wrapped in the second sealing element, the second sealing element can be in closer contact with the piston through the elastic contraction action of the elastic ring, so as to realize low temperature compensation, and when the piston undergoes a slight inclination change in the valve cavity, the second sealing element can be pushed to dynamically follow the piston through the elastic ring.
Further, in the embodiment of the present invention, the connection manner of the pressure regulating main seal and the piston is one of an extrusion closing, a threaded connection, a pre-pressing buckle groove form, a clamping connection, and a welding connection. However, the installation mode of the pressure regulating main seal and the piston is not limited to extrusion closing-in, threaded connection, pre-pressing buckle grooves, clamping connection, welding mode and the like.
Further, in the embodiment of the invention, the valve outlet is provided with a temperature sensor and/or a pressure sensor.
Further, in the embodiment of the invention, an opening is formed in the upper end of the valve cover, a filter screen is installed at the opening, and impurities in air are filtered when the piston acts through the filter screen.
Furthermore, in the embodiment of the present invention, a sealing element is installed on the filter screen, a collar is installed on the sealing element, the collar is clamped in the annular groove on the opening side, and the filter screen and the sealing element are limited and fixed by the collar.
The invention has the beneficial effects that:
according to the invention, the pressure value of the spring is preset, so that when the high-pressure hydrogen is higher than the pressure value of the spring, the piston is pushed to drive the pressure regulating main seal to move upwards, the valve outlet of the valve body is opened, and the hydrogen flows through the valve cavity and flows to automobile use equipment connected with the rear port of the valve for use in advance, so that the pipeline pressure can be stabilized, and the waste of a gas source caused by the discharge of a safety valve is avoided.
Further, the piston adopts first sealing member and second sealing member to carry out dual seal, and the elastic ring of cladding in the second sealing member not only can realize low temperature compensation, and the leakproofness is stronger, can also carry out the developments when the piston skews and follow, realizes dynamic seal. The piston adopts the double-sealing structure, and mainly aims to bear high pressure after liquid hydrogen is gasified, and bear low temperature of-253 ℃ (liquid hydrogen storage at low temperature of-253 ℃) is a basic guarantee for large-scale operation of fuel cell automobiles.
In order to achieve the second purpose, the invention adopts the following technical scheme: a method for reducing pressure of liquid hydrogen, which is applied to the pressure reducing valve for liquid hydrogen described in one of the above objects, comprising the steps of:
the compression amount of the spring between the piston and the valve cover is adjusted, the compression amount of the spring is set to a pressure value required after the liquid hydrogen bottle is depressurized, and the set pressure of the liquid hydrogen pressure reducing valve is determined by adjusting the force value design and the compression amount of the spring.
When the device is used, the valve inlet of the valve body is connected with the liquid hydrogen bottle, and the valve outlet of the valve body is connected with the using equipment of the automobile.
After liquid hydrogen in the liquid hydrogen bottle is gasified, and the pressure of the gasified high-pressure hydrogen is greater than the pressure value set by the spring, the piston is pushed to slide upwards along the valve cavity of the valve body, the spring is compressed, so that the upper and lower spring forces acting on the spring are offset, and as the piston moves upwards, the pressure regulating main seal below the piston is driven by the piston to move upwards, so that the communication between the valve cavity and the valve outlet is opened, the high-pressure hydrogen enters the valve cavity from the valve inlet, enters the valve outlet from the valve cavity, finally enters the valve rear port from the valve outlet, and the high-pressure hydrogen flows to the use equipment of the automobile through a pipeline to be used in advance.
After the pressure of the gasified high-pressure hydrogen is reduced and still greater than the set pressure value of the spring, the piston is pushed downwards under the action of the spring, and the gap between the pressure regulating main seal and the valve outlet is reduced, so that the flow resistance of the hydrogen gas is reduced, and the pressure of the hydrogen gas is increased; and after the pressure of the gasified high-pressure hydrogen becomes large, the piston drives the pressure regulating main seal to move upwards, the gap between the pressure regulating main seal and the valve outlet is increased, the flow resistance of the hydrogen gas is increased, the pressure of the hydrogen gas is reduced at the same time, and the operation is repeated in cycles, so that the aim of stabilizing the pressure of the hydrogen gas in the liquid hydrogen bottle is fulfilled.
Further, in the embodiment of the invention, when the piston moves upwards or downwards, the first sealing element and the second sealing element arranged in the circumferential direction of the piston perform double sealing, the elastic contraction action of the elastic ring coated in the second sealing element is used for strengthening the close contact between the second sealing element and the piston, so that low-temperature compensation is realized, and when the piston slightly inclines and changes relative to the valve cavity, the second sealing element on the side part of the outer coating can be pushed to dynamically follow the piston through the elastic action of the elastic ring, so that the close contact of dynamic following is realized.
Drawings
Fig. 1 is a schematic structural view of a pressure reducing valve for liquid hydrogen according to an embodiment of the present invention.
Fig. 2 is a schematic perspective view of a pressure reducing valve for liquid hydrogen according to an embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating the operation effect of the pressure reducing valve for liquid hydrogen according to the embodiment of the present invention.
In the attached drawings
1. Valve cavity of valve body 1.1 and valve inlet 1.2
1.3, valve outlet 1.4, valve rear port 2 and pressure regulating main seal
3. First seal 4, second seal 5, retaining ring
6. Piston 7, sealing gasket 8 and valve cover
9. Spring 10, filter screen 11, sealing member
12. Clamping ring
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of some embodiments of the invention and are not limiting of the invention, and that all other embodiments obtained by those of ordinary skill in the art without the exercise of inventive faculty are within the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. But it is obvious. To one of ordinary skill in the art, the embodiments may be practiced without limitation to these specific details. In some instances, well-known methods and structures for reducing pressure for liquid hydrogen are not described in detail to avoid unnecessarily obscuring the embodiments. In addition, all embodiments may be used in combination with each other.
The first embodiment is as follows:
a pressure reducing valve for liquid hydrogen, as shown in fig. 1 and 2, comprising: valve body 1, piston 6, pressure regulating main seal 2, valve gap 8, spring 9.
The valve body 1 has: a valve inlet 1.1, a valve cavity 1.2, a valve outlet 1.3 and a valve rear port 1.4. The valve inlet 1.1 is used for being connected with a liquid hydrogen bottle, the valve cavity 1.2 is communicated with the valve inlet 1.1, the valve outlet 1.3 is communicated with the valve cavity 1.2, the valve rear port 1.4 is communicated with the valve outlet 1.3, and the valve rear port 1.4 is used for being connected with a pipeline.
The piston 6 is slidably mounted in the valve chamber 1.2. The pressure regulating main seal 2 is connected with the piston 6, and the pressure regulating main seal 2 blocks the communication between the valve cavity 1.2 and the valve outlet 1.3.
The valve cover 8 is arranged on the sealing cavity, and a stroke distance is formed between the valve cover 8 and the piston 6, so that the piston 6 can slide up and down in the valve cavity 1.2 relative to the valve cover 8 to control the flow of hydrogen through the valve cavity 1.2.
The spring 9 is arranged between the piston 6 and the valve cover 8, and the compression amount of the spring 9 sets a pressure value required after the liquid hydrogen bottle is decompressed.
The implementation steps are as follows:
the compression amount of the spring 9 between the piston 6 and the valve cover 8 is adjusted, the compression amount of the spring 9 is set to a pressure value required after the liquid hydrogen cylinder is depressurized, and the set pressure of the liquid hydrogen relief valve is determined by adjusting the force value design and the compression amount of the spring 9.
When the device is used, the valve inlet 1.1 of the valve body 1 is connected with a liquid hydrogen bottle, and the valve outlet 1.3 of the valve body 1 is connected with using equipment of an automobile.
As shown in fig. 1 and 2, after the liquid hydrogen in the liquid hydrogen bottle is gasified, and the pressure of the gasified high-pressure hydrogen is greater than the pressure value set by the spring 9, the piston 6 is pushed to slide upwards along the valve cavity 1.2 of the valve body 1, the spring 9 is compressed, so that the force of the upper spring 9 and the lower spring 9 acting on the spring 9 is offset, because the piston 6 moves upwards, the pressure-regulating main seal 2 below the piston 6 moves upwards under the driving of the piston 6, the communication between the valve cavity 1.2 and the valve outlet 1.3 is opened, so that the high-pressure hydrogen enters the valve cavity 1.2 from the valve inlet 1.1, enters the valve outlet 1.3 through the valve cavity 1.2, and finally enters the valve rear port 1.4 from the valve outlet 1.3, so that the high-pressure hydrogen flows into the use equipment of the automobile through the pipeline for prior use.
After the pressure of the gasified high-pressure hydrogen is reduced and still greater than the pressure value set by the spring 9, the piston 6 is pushed downwards under the action of the spring 9, and the gap between the pressure regulating main seal 2 and the valve outlet 1.3 is reduced, so that the flow resistance of the hydrogen gas is reduced, and the pressure of the hydrogen gas is increased; and after the pressure of the gasified high-pressure hydrogen becomes large, the piston 6 drives the pressure regulating main seal 2 to move upwards, the gap between the pressure regulating main seal 2 and the valve outlet 1.3 is increased, the flow resistance of the hydrogen gas is increased, the pressure of the hydrogen gas is reduced at the same time, and the operation is repeated in cycles, so that the purpose of stabilizing the pressure of the hydrogen gas in the liquid hydrogen bottle is achieved, when the pressure of the hydrogen gas in the liquid hydrogen bottle is equal to or less than the pressure set by the initial regulating spring 9, the spring 9 pushes the piston 6 and the pressure regulating main seal 2 to reset, and the valve cavity 1.2 is sealed again and communicated with the valve outlet 1.3.
The pipeline is communicated with a container, the discharged hydrogen is collected through the container, the container is provided with a connecting port, a one-way valve is arranged at the connecting port, and the connecting port is used for being connected with using equipment of an automobile.
As shown in fig. 1 and 2, the pressure regulating main seal 2 is an elastic sealing element 11, and the contact end of the bottom of the pressure regulating main seal 2 and the valve outlet 1.3 is conical, so that the conical pressure regulating main seal 2 is used for enhancing the sealing of the valve outlet 1.3.
As shown in fig. 1 and 2, the outer surface of the piston 6 is sleeved with a first sealing member 113 and a second sealing member 114, and the first sealing member 113 and the second sealing member 114 realize sealing when the piston 6 moves and is at rest.
As shown in fig. 1 and 2, the piston 6 has an outward flange at the upper end, a retainer ring 5 is arranged on the lower surface of the flange, and the second seal ring is in close contact with the retainer ring 5.
The second sealing element 114 is fixed on the outer surface of the piston 6 or on the side wall of the valve cavity 1.2, the second sealing element 114 is in close contact with the piston 6 along the circumferential direction of the piston 6, an elastic ring is coated in the second sealing element 114, the second sealing element 114 can be in closer contact with the piston 6 through the elastic contraction action of the elastic ring, low-temperature compensation is realized, and when the piston 6 slightly inclines and changes in the valve cavity 1.2, the second sealing element 114 can be pushed to dynamically follow the piston 6 through the elastic ring.
The connection mode of the pressure regulating main seal 2 and the piston 6 is one of extrusion closing, threaded connection, prepressing buckle groove form, clamping and welding. However, the installation mode of the pressure regulating main seal 2 and the piston 6 is not limited to extrusion closing, threaded connection, pre-pressing buckle grooves, clamping connection, welding and the like.
The valve outlet 1.3 is fitted with a temperature sensor and/or a pressure sensor.
As shown in fig. 1 and 2, a sealing gasket 7 is arranged between the valve cover 8 and the valve cavity 1.2, an opening is arranged at the upper end of the valve cover 8, a filter screen 10 is arranged at the opening, and impurities in air are filtered when the piston 6 acts through the filter screen 10.
The filter screen 10 is provided with a sealing element 11, the sealing element 11 is provided with a clamping ring 12, the clamping ring 12 is clamped in the annular groove at the opening side, and the filter screen 10 and the sealing element 11 are limited and fixed through the clamping ring 12.
According to the invention, the pressure value of the spring 9 is preset, so that when high-pressure hydrogen is higher than the pressure value of the spring 9, the piston 6 is pushed to drive the pressure-regulating main seal 2 to move upwards, the valve outlet 1.3 of the valve body 1 is opened, and the hydrogen passes through the valve cavity 1.2 and flows to automobile use equipment connected with the rear port 1.4 of the valve for use in advance, so that the pipeline pressure can be stabilized, the discharge of a safety valve is avoided, and the waste of an air source is caused.
Further, the piston 6 adopts the first sealing element 113 and the second sealing element 114 to carry out double sealing, and the second sealing element 114 is wrapped by an elastic ring, so that low-temperature compensation can be realized, the sealing performance is stronger, dynamic following can be carried out when the piston 6 deflects, and dynamic sealing is realized. The piston 6 adopts the double-sealing structure, and mainly after liquid hydrogen is gasified, the valve body 1 needs to bear high pressure and low temperature of-253 ℃ (liquid hydrogen storage at low temperature of-253 ℃ is the basic guarantee for large-scale operation of fuel cell automobiles).
Example two:
a pressure reduction method for liquid hydrogen is applied to the pressure reduction valve for liquid hydrogen in the first embodiment, and comprises the following steps:
the compression amount of the spring 9 between the piston 6 and the valve cover 8 is adjusted, the compression amount of the spring 9 is set to a pressure value required after the liquid hydrogen cylinder is depressurized, and the set pressure of the liquid hydrogen relief valve is determined by adjusting the force value design and the compression amount of the spring 9.
When the device is used, the valve inlet 1.1 of the valve body 1 is connected with a liquid hydrogen bottle, and the valve outlet 1.3 of the valve body 1 is connected with using equipment of an automobile.
After the liquid hydrogen in the liquid hydrogen bottle is gasified, and the pressure of the gasified high-pressure hydrogen is greater than the pressure value set by the spring 9, the piston 6 is pushed to slide upwards along the valve cavity 1.2 of the valve body 1, the spring 9 is compressed, so that the force of the upper spring 9 and the lower spring 9 acting on the spring 9 is counteracted, because the piston 6 moves upwards, the pressure regulating main seal 2 below the piston 6 moves upwards under the driving of the piston 6, the communication between the valve cavity 1.2 and the valve outlet 1.3 is opened, so that the high-pressure hydrogen enters the valve cavity 1.2 from the valve inlet 1.1, enters the valve outlet 1.3 through the valve cavity 1.2, finally enters the valve rear port 1.4 from the valve outlet 1.3, and the high-pressure hydrogen flows to the use equipment of the automobile through a pipeline to be used in advance.
After the pressure of the gasified high-pressure hydrogen is reduced and still greater than the pressure value set by the spring 9, the piston 6 is pushed downwards under the action of the spring 9, and the gap between the pressure regulating main seal 2 and the valve outlet 1.3 is reduced, so that the flow resistance of the hydrogen gas is reduced, and the pressure of the hydrogen gas is increased; and after the pressure of the gasified high-pressure hydrogen becomes large, the piston 6 drives the pressure regulating main seal 2 to move upwards, the gap between the pressure regulating main seal 2 and the valve outlet 1.3 is increased, the flow resistance of the hydrogen gas is increased, the pressure of the hydrogen gas is reduced at the same time, and the operation is repeated in cycles, so that the purpose of stabilizing the pressure of the hydrogen gas in the liquid hydrogen bottle is achieved, when the pressure of the hydrogen gas in the liquid hydrogen bottle is equal to or less than the pressure set by the initial regulating spring 9, the spring 9 pushes the piston 6 and the pressure regulating main seal 2 to reset, and the valve cavity 1.2 is sealed again and communicated with the valve outlet 1.3.
In the above steps, when the piston 6 moves up or down, the first sealing member 113 and the second sealing member 114 arranged in the circumferential direction of the piston 6 perform double sealing, the elastic contraction action of the elastic ring wrapped in the second sealing member 114 enhances the close contact between the second sealing member 114 and the piston, so as to realize low temperature compensation, and when the piston 6 slightly inclines and changes in the valve chamber 1.2, the second sealing member 114 at the wrapping side part can be pushed to dynamically follow the piston 6 through the elastic action of the elastic ring, so as to realize dynamic following close contact.
Although the illustrative embodiments of the present invention have been described above to enable those skilled in the art to understand the present invention, the present invention is not limited to the scope of the embodiments, and it is apparent to those skilled in the art that all the inventive concepts using the present invention are protected as long as they can be changed within the spirit and scope of the present invention as defined and defined by the appended claims.
Claims (12)
1. A pressure reducing valve for liquid hydrogen, comprising:
a valve body having:
the valve inlet is used for being connected with the liquid hydrogen bottle;
a valve cavity in communication with the valve inlet;
a valve outlet in communication with the valve cavity;
a valve rear port in communication with the valve outlet, the valve rear port for connection to a pipeline; a piston slidably mounted in the valve cavity;
the pressure regulating main seal is connected with the piston and blocks the communication between the valve cavity and the valve outlet;
the valve cover is arranged on the sealing cavity, a stroke distance is reserved between the valve cover and the piston, and the piston can slide up and down in the valve cavity relative to the valve cover through the stroke distance so as to control the flow of hydrogen through the valve cavity;
and the spring is arranged between the piston and the valve cover, and the compression amount of the spring sets a pressure value required after the liquid hydrogen bottle is decompressed.
2. The pressure reducing valve for liquid hydrogen according to claim 1, wherein the line communicates with a tank through which the discharged hydrogen gas is collected, the tank having a connection port through which a check valve is provided for connection with a use device of an automobile.
3. The pressure reducing valve for liquid hydrogen according to claim 1, wherein the pressure regulating main seal is an elastic sealing member, a contact end of a bottom of the pressure regulating main seal with the valve outlet is conical, and the conical pressure regulating main seal is used for enhancing the sealing of the valve outlet.
4. The pressure reducing valve for liquid hydrogen according to claim 1, wherein a first seal and a second seal are provided around an outer surface of the piston, and the first seal and the second seal the piston during operation and at rest.
5. The pressure reducing valve for liquid hydrogen according to claim 4, wherein the piston has an outward flange at an upper end thereof, a retainer ring is provided on a lower surface of the flange, and the second seal ring is in close contact with the retainer ring.
6. The pressure reducing valve for liquid hydrogen according to claim 4, wherein the second sealing member is fixed to an outer surface of the piston or to a side wall of the valve cavity, the second sealing member is in close contact with the piston along a circumferential direction of the piston, an elastic ring is wrapped in the second sealing member, the second sealing member can be in closer contact with the piston through elastic contraction of the elastic ring, low-temperature compensation is achieved, and when the piston is slightly inclined in the valve cavity, the second sealing member can be pushed to dynamically follow the piston through the elastic ring.
7. The pressure reducing valve for liquid hydrogen according to claim 1, wherein the pressure regulating main seal is connected with the piston in one of an extrusion closing-in manner, a threaded connection manner, a pre-pressing buckle groove manner, a clamping manner and a welding manner.
8. The pressure reducing valve for liquid hydrogen according to claim 1, wherein a temperature sensor and/or a pressure sensor is attached to the valve outlet.
9. The pressure reducing valve for liquid hydrogen according to claim 1, wherein an opening is provided at an upper end of the valve cover, and a filter screen is installed at the opening to filter impurities in air when the piston is operated.
10. The pressure reducing valve for liquid hydrogen according to claim 9, wherein a seal member is mounted on the filter screen, a collar is mounted on the seal member, the collar is clamped in the annular groove on the opening side, and the filter screen and the seal member are limited and fixed by the collar.
11. A method of reducing pressure for liquid hydrogen, applied to the pressure reducing valve for liquid hydrogen according to any one of claims 1 to 10, comprising the steps of:
adjusting the compression amount of a spring between a piston and a valve cover, setting the compression amount of the spring as a pressure value required after the liquid hydrogen bottle is decompressed, and determining the set pressure of the pressure reducing valve for the liquid hydrogen by adjusting the force value design and the compression amount of the spring;
when in use, the valve inlet of the valve body is connected with the liquid hydrogen bottle, and the valve outlet of the valve body is connected with the using equipment of the automobile;
after liquid hydrogen in the liquid hydrogen bottle is gasified, and the pressure of the gasified high-pressure hydrogen is greater than the set pressure value of the spring, the piston is pushed to slide upwards along the valve cavity of the valve body, the spring is compressed, the upper and lower spring forces acting on the spring are counteracted, and as the piston moves upwards, the pressure regulating main seal below the piston is driven by the piston to move upwards, so that the communication between the valve cavity and the valve outlet is opened, the high-pressure hydrogen enters the valve cavity from the valve inlet, enters the valve outlet from the valve cavity, finally enters the valve rear port from the valve outlet, and the high-pressure hydrogen flows to the use equipment of the automobile through a pipeline to be used in advance;
after the pressure of the gasified high-pressure hydrogen is reduced and still greater than the set pressure value of the spring, the piston is pushed downwards under the action of the spring, and the gap between the pressure regulating main seal and the valve outlet is reduced, so that the flow resistance of the hydrogen gas is reduced, and the pressure of the hydrogen gas is increased; and after the pressure of the gasified high-pressure hydrogen becomes large, the piston drives the pressure regulating main seal to move upwards, the gap between the pressure regulating main seal and the valve outlet is increased, the flow resistance of the hydrogen gas is increased, the pressure of the hydrogen gas is reduced at the same time, and the operation is repeated in cycles, so that the aim of stabilizing the pressure of the hydrogen gas in the liquid hydrogen bottle is fulfilled.
12. The pressure reduction method for liquid hydrogen according to claim 11, wherein when the piston moves up or down, the first sealing member and the second sealing member arranged in the circumferential direction of the piston perform double sealing, the elastic contraction action of the elastic ring wrapped in the second sealing member strengthens the close contact between the second sealing member and the piston, so that low temperature compensation is realized, and when the piston changes slightly obliquely relative to the valve chamber, the second sealing member on the wrapping side part can be pushed by the elastic action of the elastic ring to dynamically follow the piston, so that the close contact is dynamically followed.
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Cited By (1)
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| CN114684787A (en) * | 2022-03-22 | 2022-07-01 | 武汉理工大学 | Hydrogen production device capable of buffering pyrolysis gas and using method thereof |
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