CN111720726A - Large-caliber low-volatilization loss Dewar - Google Patents

Large-caliber low-volatilization loss Dewar Download PDF

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CN111720726A
CN111720726A CN201910216140.5A CN201910216140A CN111720726A CN 111720726 A CN111720726 A CN 111720726A CN 201910216140 A CN201910216140 A CN 201910216140A CN 111720726 A CN111720726 A CN 111720726A
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cylinder
liquid helium
inner cylinder
outer cylinder
dewar
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陈培
贾振俊
茆雪健
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Beihang University
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Beihang University
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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
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
    • F17C1/04—Protecting sheathings
    • 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
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
    • F17C1/08—Integral reinforcements, e.g. ribs
    • 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
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/12—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for thermal insulation
    • 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
    • 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
    • F17C13/005—Details of vessels or of the filling or discharging of vessels for medium-size and small storage vessels not under pressure
    • F17C13/006—Details of vessels or of the filling or discharging of vessels for medium-size and small storage vessels not under pressure for Dewar vessels or cryostats
    • 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
    • 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
    • F17C13/06—Closures, e.g. cap, breakable 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
    • F17C13/08—Mounting arrangements for vessels
    • F17C13/086—Mounting arrangements for vessels for Dewar vessels or cryostats
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0119—Shape cylindrical with flat end-piece
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/032—Orientation with substantially vertical main axis
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/01—Reinforcing or suspension means
    • F17C2203/011—Reinforcing means
    • F17C2203/013—Reinforcing means in the vessel, e.g. columns
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/01—Reinforcing or suspension means
    • F17C2203/014—Suspension means
    • F17C2203/016—Cords
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0308—Radiation shield
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0391—Thermal insulations by vacuum
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0631—Three or more walls
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0123—Mounting arrangements characterised by number of vessels
    • F17C2205/013—Two or more vessels
    • F17C2205/0149—Vessel mounted inside another one
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0311—Closure means
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/016—Noble gases (Ar, Kr, Xe)
    • F17C2221/017—Helium
    • 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
    • F17C2270/00—Applications
    • F17C2270/05—Applications for industrial use
    • F17C2270/0509—"Dewar" vessels

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention discloses a large-caliber low-volatilization loss liquid helium Dewar device meeting experimental operation. The device comprises an outer cylinder, an inner cylinder suspended in the outer cylinder, a liquid helium cylinder nested in the inner cylinder, and an extension rod connected with experimental equipment. The method is characterized in that: the liquid helium cylinder is externally provided with an outer cylinder and an inner cylinder, the inner cylinder and the outer cylinder are suspended and fixed through a thin stainless steel wire, and the heat conduction power between the two cylinders is reduced; a feed line pipe between the liquid helium cylinder and the outer cylinder is a spiral thin corrugated pipe, so that the heat conduction distance is increased; the welding flanges of the inner cylinder and the liquid helium cylinder are connected by adopting a thick flange, so that the heat flow conducted downwards along the liquid helium cylinder is reduced; the side walls of the outer cylinder, the inner cylinder and the liquid helium cylinder are all designed by corrugated pipes, the corrugated pipes of the liquid helium cylinder prolong the heat conduction distance and reduce the volatilization loss, and the corrugated pipes can also provide bending rigidity; the bottom plate of the inner cylinder is an aluminum radiation plate, air holes are formed in the centers of the outer cylinder, the side wall of the inner cylinder and the radiation plate, a vacuum valve is installed on an air hole of the outer cylinder, and the vacuum valve periodically pumps out volatilized helium gas to ensure the vacuum degree between the outer cylinder and the inner cylinder, between the inner cylinder and a liquid nitrogen cylinder and between the liquid nitrogen cylinder and the liquid helium cylinder. The Dewar device provided by the invention solves the problem of high heat leakage of a large-caliber experimental Dewar, improves the heat insulation performance of the Dewar, and reduces the volatilization loss of liquid helium.

Description

Large-caliber low-volatilization loss Dewar
Technical Field
The invention belongs to the field of low-temperature liquid storage, and particularly relates to a large-caliber Dewar container.
Background
Dewar devices, also known as cryotanks, were invented by Scotland physicists and chemists James-Dewar Jazz. The Dewar device is an ideal container and tool for storing cryogenic liquid, and has the characteristics of strong storage capacity, easiness in transportation, convenience in use, simplicity and easiness in operation, good safety and the like.
Liquid helium can reach 4.2K under standard atmospheric pressure, and many low-temperature superconducting experiments often need to rely on liquid helium soaking to generate a constant low-temperature environment. Liquid helium is mainly derived from natural gas and belongs to a non-renewable resource.
The existing liquid helium storage Dewar adopts a scheme of a double-layer container with a small caliber, and comprises a tank body and a top cover, wherein the tank body comprises an inner cylinder and an outer cylinder. Wherein a vacuum layer is arranged between the inner cylinder and the outer cylinder and used for heat insulation. In many scientific research and engineering fields, large-size experimental devices are often required to be stretched into a liquid helium dewar for soaking, and most of the existing experimental dewars adopt a scheme of directly increasing the size of a top cover, so that the volatilization rate of liquid helium inside the dewar is accelerated, and the liquid helium loss of the dewar device is increased.
Disclosure of Invention
The invention aims at the prior art to improve, namely invents a Dewar device which has large caliber, high heat preservation performance and low volatility and meets the requirement of experimental operation.
Aiming at the technical problems: the technical scheme provided by the invention is as follows: a liquid helium Dewar device with large caliber and low volatilization loss satisfies experimental operation. The device comprises an outer cylinder, an inner cylinder suspended in the outer cylinder, a liquid helium cylinder nested in the inner cylinder, and an extension rod connected with experimental equipment. The method is characterized in that: the liquid helium cylinder is externally provided with an outer cylinder and an inner cylinder, and the inner cylinder and the outer cylinder are suspended and fixed through a thin stainless steel wire; a spiral corrugated pipe is used as a feed line pipe between the outer cylinder and the liquid helium cylinder; the welding flanges of the inner cylinder and the liquid helium cylinder are connected by a thick flange; the side walls of the outer cylinder, the inner cylinder and the liquid helium cylinder are all designed by adopting corrugated pipes; the bottom plate of the inner cylinder is an aluminum radiation plate, air holes are formed in the centers of the outer cylinder, the side wall of the inner cylinder and the radiation plate, a vacuum valve is installed on an air hole of the outer cylinder, and the vacuum valve periodically pumps out volatilized helium gas to ensure the vacuum degree between the outer cylinder and the inner cylinder, between the inner cylinder and a liquid nitrogen cylinder and between the liquid nitrogen cylinder and the liquid helium cylinder.
Based on the liquid helium dewar device which satisfies the experimental operation and has large caliber and low volatilization loss, three heat leakage modes of heat conduction, heat radiation and heat convection are blocked or reduced. The temperature of the top cover of the original liquid helium dewar is reduced to a certain temperature from room temperature in a mode of suspending the stainless steel wires, the temperature of the top cover is far lower than the room temperature after being stabilized, the heat conduction paths of the inner cylinder and the outer cylinder in a room temperature state are three suspended stainless steel wires, the heat conduction power between two layers is reduced, the feed line pipe is designed into a spiral shape, the heat conduction distance between the top cover of the outer cylinder and the top cover of the liquid helium cylinder can be increased, meanwhile, a vacuum layer is arranged between the outer cylinder and the inner cylinder, which is equivalent to the increase of a layer of cold screen, and the heat conduction path at the opening top cover of the large-.
Furthermore, the side wall of the liquid helium Dewar is welded by adopting two end pipes, the lower part is a common round pipe, the upper part is a corrugated pipe with shorter peak distance, and the corrugated pipe is used for prolonging the heat conduction distance. The bellows is adopted to urceolus, inner tube, liquid nitrogen cylinder lateral wall, and the relative liquid helium dewar lateral wall of ripple peak distance uses the bellows longer, because between urceolus and inner tube, inner tube and liquid nitrogen cylinder are the vacuum layer between liquid nitrogen cylinder and the liquid helium cylinder, and the pressure differential effect has radial pressure, and the bellows can provide compressive stiffness.
Drawings
While the drawings that form a part hereof will be described in detail below for the purpose of illustrating the preferred embodiments of the invention more clearly, it is to be understood that there are shown and described in detail certain embodiments of the invention that are within the scope of the appended claims.
FIG. 1 is a schematic cross-sectional structure view of a large-caliber low-volatility loss liquid helium Dewar device of the present invention: 1-upper outer cylinder, 2-lower outer cylinder, 3-inner cylinder, 4-liquid helium cylinder, 5-experimental rod, 6-aluminum radiation plate, 7-carbon filter screen, 8-MLI interlayer, 9-vacuum pump, 10-connecting stainless steel wire, 11-lug, 12-outer cylinder flange, 13-resonance damping rod, 14-feed pipe, 15-room temperature cable interface, 16-safety valve
Detailed Description
The following description is presented to enable one of ordinary skill in the art to better understand and implement the present invention. The following examples are by way of example only and should not be construed as limiting the invention to the illustrative examples described herein.
The first embodiment is as follows:
as shown in fig. 1, the present invention provides a large caliber low volatility liquid helium dewar apparatus that satisfies the experimental practices. The Dewar is divided into 3 layers of structure, which are outer cylinder (1 and 2), inner cylinder 3, and liquid helium Dewar 4. The three-layer structure adopts a corrugated pipe design.
Liquid helium is stored in the liquid helium Dewar 4 and used for soaking the experiment rod 5, the upper cover of the experiment rod 5 is a flange plate which is connected with a top cover bolt of the liquid helium Dewar 4 and sealed through an O-shaped ring.
The outer cylinder comprises an upper outer cylinder 1 and a lower outer cylinder 2, an outer cylinder flange 12 is welded on the two parts, the outer cylinder flange 12 is connected through bolts and sealed through an O-shaped ring, and a resonant damping rod 13 is welded on the side wall of the outer cylinder corrugated pipe, so that the stability of the corrugated pipe is improved.
The three-layer Dewar structure comprises outer cylinders 1 and 2, an inner cylinder 3 and a liquid helium Dewar 4 which are coaxially arranged. 3 lug pieces 11 are welded on the inner wall of the corrugated pipe of the upper outer cylinder 1 along the circumferential direction, three lug pieces 11 are also welded on the corresponding positions on the outer wall of the corrugated pipe of the inner cylinder 3, and the inner cylinder 3 is suspended on the upper outer cylinder 1 through a stainless steel wire 10. The inner cylinder 3 and the liquid helium dewar 4 are connected by welding through a flange of a top cover of the inner cylinder.
The safety valve 16 is installed on the upper portion of the liquid helium Dewar 4, two KF40 vacuum pump interfaces 9 are welded on the side wall of the upper bellows of the lower outer cylinder 2, a 40mm hole is formed in the side wall of the inner cylinder 3, an aluminum radiation plate 6 is welded at the bottom of the inner cylinder 3, the center of the aluminum radiation plate 6 is opened, and a carbon filter layer 7 is welded on the center of the aluminum radiation plate. Vacuum interlayers are formed between the outer cylinders 1 and 2 and the inner cylinder 3, and between the inner cylinder 3 and the liquid helium dewar 4 by using a vacuum pump from outside the dewar. The vacuum layer is filled with an MLI interlayer 8.
A hole is formed in the top cover of the upper flange of the experimental rod 6, an LEMO interface is installed, and the LEMO interface is sealed through an O-shaped ring; a hole is formed in the top cover of the upper outer cylinder 1, a special-shaped KF40 flange 15 is welded on the top cover, an LEMO interface is installed, and the sealing is realized through an O-shaped ring; the flange interface on the experimental rod and the flange interface on the outer cylinder are connected through a feed line pipe 14, the feed line pipe 14 is of a spiral structure, and a cable is arranged in the feed line pipe and is used for the circuit communication of the room temperature section and the low temperature section of the experimental device. A low-temperature section cable channel is welded at an LEMO interface of the top cover of the experiment rod 6 and extends downwards to an experiment device in the liquid helium soaking process inside the liquid helium cylinder 4 to form a low-temperature section cable passage.

Claims (6)

1. A liquid helium Dewar device with large caliber and low volatilization loss satisfies experimental operation. The device comprises an outer cylinder, an inner cylinder suspended in the outer cylinder, a liquid helium cylinder nested in the inner cylinder, and an extension rod connected with experimental equipment. The method is characterized in that: the liquid helium cylinder is externally provided with an outer cylinder and an inner cylinder, and the inner cylinder and the outer cylinder are suspended and fixed through a thin stainless steel wire; a spiral corrugated pipe is used as a feed line pipe between the outer cylinder and the liquid helium cylinder; the welding flanges of the inner cylinder and the liquid helium cylinder are connected by a thick flange; the side walls of the outer cylinder, the inner cylinder and the liquid helium cylinder are all designed by corrugated pipes.
2. The liquid helium dewar apparatus satisfying experimental operation of claim 1, wherein: the outer barrel is of a split structure, the top cover and the bottom cover are welded plane plugs, the sealing surface is a welded sealing flange, and three pairs of lugs are welded on the inner side of the side wall of the upper corrugated pipe and are connected with the three pairs of lugs on the outer side of the side wall of the inner barrel through thin stainless steel wires.
3. The liquid helium dewar apparatus satisfying experimental operation of claim 1, wherein: the side wall of the liquid helium Dewar is welded by two end pipes, the lower part is a common circular pipe, and the upper part is a corrugated pipe with shorter peak distance. The outer cylinder, the inner cylinder and the side wall of the liquid nitrogen cylinder are corrugated pipes, and the corrugated peak distance is longer than that of the corrugated pipe used on the side wall of the liquid helium Dewar.
4. The liquid helium dewar apparatus satisfying experimental operation of claim 1, wherein: the vacuum layers of the liquid nitrogen cylinder and the liquid helium cylinder are filled by a multi-layer heat insulation Material (MLI) interlayer.
5. The liquid helium dewar apparatus satisfying experimental operation of claim 3, wherein: the low-temperature liquid in the liquid helium cylinder can be any one of liquid helium, liquid oxygen and liquid argon.
6. The liquid helium dewar apparatus satisfying experimental operation of claim 3, wherein: the welding flanges of the inner cylinder and the liquid helium cylinder are connected by a thick flange.
CN201910216140.5A 2019-03-21 2019-03-21 Large-caliber low-volatilization loss Dewar Pending CN111720726A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112815226A (en) * 2021-02-05 2021-05-18 氢合科技(广州)有限公司 High-vacuum maintained liquid helium dewar
CN114198633A (en) * 2021-12-14 2022-03-18 江阴市富仁高科股份有限公司 Vacuum heat-insulation deep-cooling hydrogen storage pressure vessel and manufacturing process thereof
WO2022161155A1 (en) * 2021-01-29 2022-08-04 上海兴邺材料科技有限公司 Tank

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022161155A1 (en) * 2021-01-29 2022-08-04 上海兴邺材料科技有限公司 Tank
CN112815226A (en) * 2021-02-05 2021-05-18 氢合科技(广州)有限公司 High-vacuum maintained liquid helium dewar
CN114198633A (en) * 2021-12-14 2022-03-18 江阴市富仁高科股份有限公司 Vacuum heat-insulation deep-cooling hydrogen storage pressure vessel and manufacturing process thereof

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