CN111237632A - Composite liquid helium dewar with liquid nitrogen cold screen - Google Patents

Composite liquid helium dewar with liquid nitrogen cold screen Download PDF

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Publication number
CN111237632A
CN111237632A CN202010164482.XA CN202010164482A CN111237632A CN 111237632 A CN111237632 A CN 111237632A CN 202010164482 A CN202010164482 A CN 202010164482A CN 111237632 A CN111237632 A CN 111237632A
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China
Prior art keywords
cylinder
composite material
inner cylinder
middle cylinder
composite
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CN202010164482.XA
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Chinese (zh)
Inventor
潘皖江
陈欣蕊
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Anhui Yinsudan Electric Co ltd
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Anhui Yinsudan Electric Co ltd
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Priority to CN202010164482.XA priority Critical patent/CN111237632A/en
Publication of CN111237632A publication Critical patent/CN111237632A/en
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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
    • F17C1/12—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
    • 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
    • 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
    • F17C2203/03—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
    • F17C2203/0658—Synthetics
    • F17C2203/0663—Synthetics in form of fibers or filaments
    • 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
    • F17C2221/014—Nitrogen
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/013—Single phase liquid
    • 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
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/03—Dealing with losses
    • F17C2260/031—Dealing with losses due to heat transfer
    • 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
    • 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
    • F17C2270/0527—Superconductors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Containers, Films, And Cooling For Superconductive Devices (AREA)

Abstract

The embodiment of the invention discloses a composite material liquid helium Dewar with a liquid nitrogen cold screen, which comprises an inner cylinder, a middle cylinder, an outer cylinder and a low heat leakage plug, wherein the inner cylinder, the middle cylinder, the outer cylinder and the low heat leakage plug are made of composite materials, the outer cylinder is made of the composite materials, the middle cylinder is used for vacuum maintenance, the middle cylinder is used for storing liquid nitrogen, the inner cylinder is used for storing liquid helium, and the space surrounded by the middle cylinder, the inner cylinder and the outer cylinder can be kept to be‑3Pa, the cylindrical shells of the inner cylinder, the middle cylinder and the outer cylinder and the lower bottom plate are woven by fibers, and the composite material is cured and formed by impregnating epoxy resin under vacuum pressure, and the air gap rate of the obtained composite material is less than 1 percent. The multilayer heat insulating materials attached to the outer surfaces of the disc-shaped composite material partition plates fixed on the outer surface of the inner cylinder, the outer side surface of the middle cylinder and the lower bottom surface of the middle cylinder play a role of cold shielding, and the radiation heat of the lower bottom plate of the outer cylinder to the lower bottom plate of the inner cylinder is reduced. The low heat leakage plug composed of the metal coating anti-radiation screen, the low heat conduction material, the composite material hollow tube and the nut reduces the heat leakage of the upper opening of the Dewar.

Description

Composite liquid helium dewar with liquid nitrogen cold screen
Technical Field
The invention relates to the field of superconducting medical treatment, superconducting nondestructive detection and superconducting nondestructive detection, in particular to a composite material liquid helium dewar which has low electromagnetic noise and low liquid helium volatilization rate and can reliably work for a long time.
Background
The composite material liquid helium dewar is a key component in a superconducting magnetoencephalograph, a superconducting magnetocardiograph, a superconducting nondestructive testing device and a superconducting nondestructive detection device, for example, in the superconducting magnetoencephalograph and the superconducting magnetomagnetocardiograph, the composite material liquid helium dewar for containing a superconducting quantum amplifier has the characteristics of no magnetism, insulation, low temperature resistance and excellent mechanical property, and can ensure the detection precision of the superconducting quantum amplifier, thereby realizing the precise detection of a weak biological magnetic field and diagnosing the health conditions of the brain and the heart of a human.
The invention relates to a composite material liquid helium Dewar which is based on a fiber braided structure and is formed by vacuum pressure impregnation of epoxy resin through curing and molding of a cylindrical shell and a disc-shaped lower bottom plate of an inner Dewar cylinder, a cylindrical shell and a ring-shaped lower bottom plate of a middle cylinder, a cylindrical shell and a disc-shaped lower bottom plate of an outer cylinder, and the cylindrical shell and the disc-shaped lower bottom plate of an outer cylinder.
Disclosure of Invention
The invention aims to provide a composite material liquid helium dewar with a liquid nitrogen cold shield, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a composite liquid helium Dewar with liquid nitrogen cold shield comprises an inner barrel made of composite material and used for containing liquid helium; the middle cylinder is made of composite materials and used for containing liquid nitrogen; an outer cylinder made of a composite material for vacuum holding; and a low heat leak plug for reducing volatilization of liquid helium; wherein the composite material is fiber reinforced epoxy resin; the inner cylinder is positioned in the middle cylinder, the middle cylinder is positioned in the outer cylinder, the inner cylinder, the middle cylinder and the outer cylinder are sleeved together, and the opening of the inner cylinder is hermetically connected with the low-leakage plug.
As a preferred technical scheme of the invention: the inner cylinder comprises an inner cylinder cylindrical shell and an inner cylinder lower bottom plate, wherein the inner cylinder is of a fiber woven structure, and is cured and molded by impregnating epoxy resin through vacuum pressure; the middle cylinder comprises a middle cylinder inner side cylindrical shell, a middle cylinder outer side cylindrical shell and a middle cylinder annular lower bottom plate which are in a fiber weaving structure and are cured and molded by impregnating epoxy resin through vacuum pressure; the outer barrel comprises an outer barrel cylindrical shell and an outer barrel disc-shaped lower bottom plate, wherein the outer barrel is of a fiber woven structure, and the outer barrel cylindrical shell and the outer barrel disc-shaped lower bottom plate are cured and formed by impregnating epoxy resin through vacuum pressure.
As a preferred technical scheme of the invention: the outer surface of the inner cylinder and the outer surfaces of the cylindrical shell on the inner side of the middle cylinder and the annular lower bottom plate of the middle cylinder are wrapped by a plurality of layers of heat-insulating cold screens, and the heat-insulating cold screens are arranged in a staggered mode through radiation-proof screens and fiber nets, wherein the radiation-proof screens can penetrate through electromagnetic waves and are provided with gridding double-sided metal coatings.
As a preferred technical scheme of the invention: the sealing device is characterized by further comprising a connecting plate for sealing, the outer side of the connecting plate is inserted into the cylindrical shell on the outer side of the middle cylinder, the cylindrical shell on the inner cylinder is in threaded connection with the connecting plate, and sealing between the cylindrical shell on the outer side of the middle cylinder and the cylindrical shell on the inner cylinder is achieved.
As a preferred technical scheme of the invention: well inboard cylinder casing of section of thick bamboo with through the urceolus upper plate threaded connection who is equipped with between the inner tube cylinder casing, just the urceolus upper plate, including first internal thread, second internal thread and external screw thread, the second internal thread with inner tube cylinder casing threaded connection, first internal thread with well inboard cylinder casing threaded connection, just the external screw thread with urceolus cylinder casing threaded connection on the urceolus.
As a preferred technical scheme of the invention: the low heat leakage plug comprises a radiation protection screen with a gridding metal coating, a cylindrical heat insulation block made of a low-heat-conduction non-metal material, a disc plate made of a composite material, a hollow pipe made of a composite material with an external thread at the lower end and a nut made of a composite material; the both sides face of cylinder heat insulating block with the laminating of radiation protection screen, just the hollow tube runs through cylinder heat insulating block and radiation protection screen, and through the nut will disc board the cylinder heat insulating block with the radiation protection screen is fixed on the hollow tube.
By adopting the technical scheme, the invention has the beneficial effects that: because the inner cylinder, the middle cylinder and the outer cylinder which are made of composite materials, and the low heat leakage plug which is made of composite materials, etc., the outer cylinder is used for vacuum maintenance, the middle cylinder is used for storing liquid nitrogen, the inner cylinder is used for storing liquid helium, and the space surrounded by the middle cylinder, the inner cylinder and the outer cylinder can be kept less than or equal to 10 for a long time-3Pa high vacuum, weaving the cylindrical shell and the lower bottom plate of the inner cylinder, the middle cylinder and the outer cylinder by fibers, impregnating epoxy resin by vacuum pressure, curing and molding to obtain the composite materialThe air gap rate of the material is less than 1 percent;
the multilayer heat insulating materials attached to the outer surfaces of the disc-shaped composite material partition plates fixed on the outer surface of the inner cylinder, the outer side surface of the middle cylinder and the lower bottom surface of the middle cylinder play a role of cold shielding, and reduce the radiant heat of the lower bottom plate of the outer cylinder to the lower bottom plate of the inner cylinder;
the low heat leakage plug composed of the metal coating anti-radiation screen, the low heat conduction material, the composite material hollow tube and the nut reduces the heat leakage of the upper opening of the Dewar.
Drawings
FIG. 1 is a schematic diagram of a basic structure of the present invention;
FIG. 2 is a schematic diagram of an inner barrel structure provided in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a middle tube according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an outer barrel according to an embodiment of the present invention;
FIG. 5 is a schematic view of a low leakage plug provided in accordance with an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a sealing upper bottom plate of a cylindrical shell outside an outer cylinder and a middle cylinder according to an embodiment of the present invention;
fig. 7 is a schematic structural view of a sealing connection plate between a cylindrical shell and an inner cylinder inside a middle cylinder according to an embodiment of the present invention.
In the figure: 1. an inner barrel; 11. an inner cylinder cylindrical shell; 12. a lower bottom plate of the inner cylinder; 2. a middle cylinder; 21. a cylindrical shell at the inner side of the middle cylinder; 22. a cylindrical shell outside the middle cylinder; 23. a middle cylinder ring-shaped lower bottom plate; 3. an outer cylinder; 31. an outer cylinder shell; 32. a disc-shaped lower bottom plate of the outer cylinder; 4. a low heat leak plug; 41. a radiation-proof screen; 42. a cylindrical heat insulation block; 43. a disc plate; 44. a hollow tube; 45. a nut; 5. an upper bottom plate of the outer cylinder; 51. a first internal thread; 52. an external thread; 53. a second internal thread; 6. and sealing the connecting plate.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "upper surface", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to 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. In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1-7, an embodiment of the present invention is shown: a composite material liquid helium Dewar with liquid nitrogen cold screen comprises an inner cylinder 1 made of composite material and used for containing liquid helium; a middle cylinder 2 made of composite material and used for containing liquid nitrogen; an outer cylinder 3 for vacuum holding made of a composite material; and a low heat leak plug 4 for reducing volatilization of liquid helium; wherein the composite material is fiber reinforced epoxy resin; the inner cylinder 1 is positioned in the middle cylinder 2, the middle cylinder 2 is positioned in the outer cylinder 3, the three are sleeved together, and the opening of the inner cylinder 1 is hermetically connected with the low heat leakage plug 4. The air gap rate of the composite material structure material of the inner barrel 1, the middle barrel 2 and the outer barrel 3 is less than 1%; the composite material liquid helium Dewar with the liquid nitrogen cold screen can keep less than or equal to 10 for a long time-3Pa of high vacuum.
The inner cylinder 1 comprises an inner cylinder cylindrical shell 11 and an inner cylinder lower bottom plate 12, wherein the inner cylinder cylindrical shell adopts a fiber woven structure and is cured and molded by impregnating epoxy resin through vacuum pressure; the middle cylinder 2 comprises a middle cylinder inner side cylindrical shell 21, a middle cylinder outer side cylindrical shell 22 and a middle cylinder annular lower bottom plate 23 which are in a fiber weaving structure and are cured and molded by impregnating epoxy resin through vacuum pressure; the outer cylinder 3 comprises an outer cylinder cylindrical shell 31 and an outer cylinder disc-shaped lower bottom plate 32, wherein the outer cylinder is of a fiber woven structure, and is cured and formed by impregnating epoxy resin through vacuum pressure; the inner barrel 1, the middle barrel 2 and the outer barrel 3 can realize high strength, low leakage rate and low conduction heat leakage with ultrathin wall thickness, wherein the wall thickness is only 15 mm. The liquid nitrogen contained in the middle tube 2 positioned between the inner tube 1 and the outer tube 3 absorbs the radiant heat of the room-temperature outer tube 3, and the radiant heat load of the 77K liquid nitrogen cold shield on 4.2K liquid helium is far lower than that on 4.2K liquid helium at room temperature, namely about 300K, according to the radiant heat transfer formula.
The outer surface of the inner cylinder 1, the inner side cylindrical shell 21 of the middle cylinder and the outer surface of the annular lower bottom plate 23 of the middle cylinder are wrapped by a plurality of layers of heat-insulating cold screens, and the heat-insulating cold screens are formed by arranging a radiation-proof screen capable of penetrating electromagnetic waves and provided with a gridding double-sided metal coating and a fiber mesh in a staggered mode, so that the radiant heat of the disc-shaped lower bottom plate 32 of the outer cylinder to the inner lower bottom plate 12 of the inner cylinder is reduced, and electromagnetic noise is not generated for the superconducting quantum amplifier.
Wherein, still including being used for sealed connecting plate 6, the outside of connecting plate 6 is inserted in well section of thick bamboo outside cylinder casing 22, just inner tube cylinder casing 11 with connecting plate 6 threaded connection realizes well section of thick bamboo outside cylinder casing 22 with sealed between the inner tube cylinder casing 11, connecting plate 6 can realize the sealing connection between inner tube cylinder casing 11 and well section of thick bamboo outside cylinder casing 22 to sealed inner tube 1 and sealed well section of thick bamboo 2 have been formed.
Wherein, well inboard cylinder casing 21 of section of thick bamboo with 5 threaded connection of urceolus upper plate through being equipped with between the inner tube cylinder casing 11, just urceolus upper plate 5, including first internal thread 51, second internal thread 53 and external screw thread 52, second internal thread 53 with 11 threaded connection of inner tube cylinder casing, first internal thread 51 with well inboard cylinder casing 21 threaded connection of section of thick bamboo, just external screw thread 52 with urceolus cylinder casing 31 threaded connection on the urceolus 3, urceolus upper plate 5 can realize the sealing connection between urceolus cylinder casing 31 and the urceolus outside cylinder casing 22.
The low heat leakage plug 4 comprises a radiation protection screen 41 with a gridding metal coating, a cylindrical heat insulation block 42 made of a low-heat-conduction non-metal material, a disc plate 43 made of a composite material, a hollow tube 44 made of a composite material with threads at the lower end and a nut 45 made of a composite material; the both sides face of cylinder heat insulating block 42 with the laminating of radiation protection screen 41, just hollow tube 44 runs through cylinder heat insulating block 42 and radiation protection screen 41, and pass through nut 45 will disc board 43 cylinder heat insulating block 42 with radiation protection screen 41 is fixed on the hollow tube 44, combined material thin wall hollow tube 44 both plays the infusion, gives vent to anger the effect, uses with nut 45 cooperation still has support and positioning action.
When in use, the space enclosed by the middle barrel 2, the inner barrel 1 and the outer barrel 3 is pumped to 10-3Pa high vacuum, injecting 77K liquid nitrogen into the double-layer cylindrical shell of the middle cylinder, injecting cold nitrogen into the inner cylinder 1 to be pre-cooled to 77K, then injecting liquid helium, inserting the low heat leakage plug 4 into the upper end opening of the inner cylinder 1 until the cover plate at the upper end of the plug is contacted with the upper end surface of the inner cylinder 1, and the composite material liquid helium Dewar can be used for containing cooling media with the liquid nitrogen temperature of 77K to 4K.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.

Claims (6)

1. A composite liquid helium Dewar with a liquid nitrogen cold screen is characterized by comprising an inner barrel (1) which is made of composite materials and used for containing liquid helium;
a middle cylinder (2) made of composite material and used for containing liquid nitrogen;
an outer cylinder (3) made of a composite material for vacuum holding;
and a low heat leak plug (4) for reducing volatilization of liquid helium;
wherein the composite material is fiber reinforced epoxy resin;
the inner cylinder (1) is positioned in the middle cylinder (2), the middle cylinder (2) is positioned in the outer cylinder (3), the inner cylinder, the middle cylinder and the outer cylinder are sleeved together, and the opening of the inner cylinder (1) is hermetically connected with the low-leakage plug (4).
2. The composite liquid helium dewar with liquid nitrogen cold shield according to claim 1, wherein: the inner cylinder (1) comprises an inner cylinder cylindrical shell (11) and an inner cylinder lower bottom plate (12), wherein the inner cylinder cylindrical shell is of a fiber woven structure and is cured and formed by impregnating epoxy resin through vacuum pressure;
the middle cylinder (2) comprises a middle cylinder inner side cylindrical shell (21), a middle cylinder outer side cylindrical shell (22) and a middle cylinder annular lower bottom plate (23) which are in a fiber weaving structure and are cured and molded by impregnating epoxy resin through vacuum pressure;
the outer cylinder (3) comprises an outer cylinder cylindrical shell (31) and an outer cylinder disc-shaped lower bottom plate (32), wherein the outer cylinder cylindrical shell is of a fiber woven structure and is cured and molded by impregnating epoxy resin through vacuum pressure.
3. The composite liquid helium dewar with liquid nitrogen cold shield according to claim 2, wherein: the outer surface of the inner cylinder (1) and the outer surfaces of the inner cylinder inner side cylindrical shell (21) and the middle cylinder annular lower bottom plate (23) are wrapped with multiple layers of heat-insulating cold screens, and the heat-insulating cold screens are arranged in a staggered mode through radiation-proof screens and fiber nets, wherein the radiation-proof screens can penetrate through electromagnetic waves and are provided with gridding double-sided metal coatings.
4. The composite liquid helium dewar with liquid nitrogen cold shield according to claim 3, wherein: still including being used for sealed connecting plate (6), the outside of connecting plate (6) is inserted in well section of thick bamboo outside cylinder casing (22), just inner tube cylinder casing (11) with connecting plate (6) threaded connection realizes well section of thick bamboo outside cylinder casing (22) with seal between inner tube cylinder casing (11).
5. The composite liquid helium dewar with liquid nitrogen cold shield according to claim 4, wherein: well inboard cylinder casing (21) of section of thick bamboo with through urceolus upper plate (5) threaded connection who is equipped with between inner tube cylinder casing (11), just urceolus upper plate (5) including first internal thread (51), second internal thread (53) and external screw thread (52), second internal thread (53) with inner tube cylinder casing (11) threaded connection, first internal thread (51) with well inboard cylinder casing (21) threaded connection of section of thick bamboo, just external screw thread (52) with urceolus cylinder casing (31) threaded connection on urceolus (3).
6. The composite liquid helium dewar with liquid nitrogen cold shield according to claim 1, wherein: the low heat leakage plug (4) comprises a radiation protection screen (41) with a gridding metal coating, a cylindrical heat insulation block (42) made of a low-heat-conduction non-metal material, a disc plate (43) made of a composite material, a hollow pipe (44) made of a composite material with an external thread at the lower end and a nut (45) made of a composite material; the both sides face of cylinder heat insulating block (42) with the laminating of radiation protection screen (41), just hollow tube (44) run through cylinder heat insulating block (42) and radiation protection screen (41), and pass through nut (45) will disc board (43) cylinder heat insulating block (42) with radiation protection screen (41) are fixed on hollow tube (44).
CN202010164482.XA 2020-03-11 2020-03-11 Composite liquid helium dewar with liquid nitrogen cold screen Pending CN111237632A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112797309A (en) * 2020-12-29 2021-05-14 探普(南京)工业科技有限公司 Liquid helium dewar
CN113339702A (en) * 2021-07-01 2021-09-03 段娜 Refrigerating system and liquid helium dewar bottle gas protection device
CN117128442A (en) * 2023-08-07 2023-11-28 北京航天试验技术研究所 Constant-temperature constant-pressure low-temperature dewar, system and method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112797309A (en) * 2020-12-29 2021-05-14 探普(南京)工业科技有限公司 Liquid helium dewar
CN113339702A (en) * 2021-07-01 2021-09-03 段娜 Refrigerating system and liquid helium dewar bottle gas protection device
CN117128442A (en) * 2023-08-07 2023-11-28 北京航天试验技术研究所 Constant-temperature constant-pressure low-temperature dewar, system and method thereof
CN117128442B (en) * 2023-08-07 2024-05-17 北京航天试验技术研究所 Constant-temperature constant-pressure low-temperature dewar, system and method thereof

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