CN111473244A - Composite material liquid helium Dewar using evaporative cooling helium gas to cool cold screen - Google Patents

Composite material liquid helium Dewar using evaporative cooling helium gas to cool cold screen Download PDF

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Publication number
CN111473244A
CN111473244A CN202010288769.3A CN202010288769A CN111473244A CN 111473244 A CN111473244 A CN 111473244A CN 202010288769 A CN202010288769 A CN 202010288769A CN 111473244 A CN111473244 A CN 111473244A
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China
Prior art keywords
outer cylinder
inner cylinder
cylindrical shell
liquid helium
cold
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Pending
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CN202010288769.3A
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Chinese (zh)
Inventor
潘皖江
曹益
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Peixian Jiayuan Venture Capital Co ltd
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Peixian Jiayuan Venture Capital Co ltd
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Priority to CN202010288769.3A priority Critical patent/CN111473244A/en
Publication of CN111473244A publication Critical patent/CN111473244A/en
Pending legal-status Critical Current

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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
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/08—Vessels not under pressure with provision for thermal insulation by vacuum spaces, e.g. Dewar flask
    • 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
    • F17C13/001—Thermal insulation specially adapted for cryogenic 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
    • F17C13/06—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
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/04—Vessels not under pressure with provision for thermal insulation by insulating layers
    • 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
    • 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
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0658—Synthetics
    • F17C2203/0663—Synthetics in form of fibers or filaments
    • F17C2203/0673—Polymers
    • 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
    • F17C2205/0103—Exterior arrangements
    • F17C2205/0107—Frames
    • 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)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)

Abstract

The embodiment of the invention discloses a composite material liquid helium Dewar using evaporative cooling helium to cool a cold screen, which comprises an inner cylinder, an outer cylinder and a low heat leakage plug, wherein the inner cylinder and the outer cylinder are made of composite materials. The outer cylinder is used for vacuum maintenance, and the inner cylinder is used for storing liquid helium; the space enclosed by the inner cylinder and the outer cylinder can be kept less than or equal to 10 for a long time‑3High vacuum of Pa; the cylindrical shell, the lower bottom plate and the upper end neck tube of the inner cylinder, the cylindrical shell and the lower bottom plate of the outer cylinder are all woven by adopting glass fibers, and are cured and formed by impregnating epoxy resin under vacuum pressure, so that the air gap rate of the composite material is less than or equal to 1 percent.

Description

Composite material liquid helium Dewar using evaporative cooling helium gas to cool cold screen
Technical Field
The invention relates to the field of weak magnetic detection, such as geomagnetic detection for prospecting, superconducting medical equipment for diagnosing the health conditions of the brain and the heart of a human body, and high-sensitivity and high-resolution nondestructive detection, in particular to a non-magnetic, low-temperature-resistant, anti-fatigue and low-liquid-helium-volatility composite-material liquid helium dewar.
Background
The composite material liquid helium dewar is a key component in superconducting geomagnetic detection equipment, superconducting magnetoencephalography, superconducting magnetocardiography, superconducting nondestructive testing equipment and superconducting nondestructive detection equipment, for example, in the superconducting geomagnetic instrument, the composite material liquid helium dewar used for containing a superconducting sensor has the characteristics of no magnetism, low temperature resistance, fatigue resistance and low liquid helium volatilization rate, and can ensure the detection precision of the superconducting sensor, thereby realizing the precise detection of a weak geomagnetic field and determining the mineral deposit distribution condition. The cylindrical shell, the neck tube and the disc-shaped lower bottom plate based on the Dewar inner cylinder, and the cylindrical shell and the disc-shaped lower bottom plate of the outer cylinder are woven by fibers and are cured and molded by impregnating epoxy resin under vacuum pressure, so that the fiber reinforced epoxy resin composite material has lower air gap rate and obtains excellent normal-temperature and low-temperature fatigue resistance mechanical properties and chemical stability.
Disclosure of Invention
The invention aims to provide a composite material ultrathin liquid helium dewar for cooling a cold screen by using evaporative cold helium gas, so as 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 using evaporative cooling helium gas to cool a cold shield is characterized in that: comprises an inner cylinder for containing liquid helium; an outer cylinder is arranged on the outer side of the inner cylinder; the inner cylinder is provided with a low heat leakage plug for reducing the volatilization rate of liquid helium in the inner cylinder; and covering the inner cylinder in the outer cylinder by using a metal cover which is made of metal wires into a multi-stage cage shape, wherein the inner cylinder and the outer cylinder are both made of glass fiber reinforced epoxy resin composite materials, and a space formed between the inner cylinder and the outer cylinder is used for keeping vacuum.
As a preferred technical scheme of the invention: the inner cylinder comprises a cylindrical shell, a neck pipe and a disc-shaped lower bottom plate, wherein the cylindrical shell is integrally woven by adopting glass fibers and is formed by curing through vacuum pressure impregnation epoxy resin, and the neck pipe is used for fixing the metal cover on the inner cylinder.
As a preferred technical scheme of the invention: the outer cylinder comprises an outer cylinder cylindrical shell and an outer cylinder disc-shaped lower bottom plate, wherein the outer cylinder cylindrical shell is integrally woven by adopting glass fibers and is formed by impregnating epoxy resin through vacuum pressure and curing, a space for keeping vacuum is formed between the outer cylinder cylindrical shell and the inner cylinder cylindrical shell, and the upper end of the outer cylinder is sealed through an arranged outer cylinder upper bottom plate, so that the vacuum keeping of the space is realized.
As a preferred technical scheme of the invention: the low heat leakage plug comprises a metal radiation-proof screen, a cylindrical vacuum container made of composite material and a nut made of composite material, wherein the lower end of the low heat leakage plug is provided with external threads and is a hollow thin-walled infusion tube; one end of the infusion tube is connected with the container cover plate, and the other end of the infusion tube penetrates through the nut to extend to the bottom of the vacuum container and penetrate through the bottom of the vacuum container; the radiation-proof screen is positioned in the vacuum container and is sleeved on the infusion tube.
As a preferred technical scheme of the invention: the vacuum container comprises a cylindrical shell and an outer convex sealing bottom, and the wall thickness of the cylindrical shell and the outer convex sealing bottom is 15 mm; the container cover plate is hermetically connected with the cylindrical shell through a threaded structure; the infusion tube is hermetically connected with the convex back cover through a threaded structure; the nut is positioned in the vacuum container and compresses the center of the inner surface of the convex back cover so as to enhance the strength of the center of the convex back cover.
As a preferred technical scheme of the invention: the metal cover is wrapped in a metal coating anti-radiation screen capable of transmitting electromagnetic waves and a heat radiation prevention cold screen formed by interlacing a glass silk screen.
By adopting the technical scheme, the invention has the beneficial effects that: 1. the cylindrical shell of the inner cylinder, the lower bottom plate, the neck tube and the cylindrical shell and the lower bottom plate of the outer cylinder are woven by fibers and are cured and molded by impregnating epoxy resin under vacuum pressure, so that the air gap rate of the fiber reinforced epoxy resin composite material is reduced, the compactness of the composite material is improved, and the cylinder body can have higher mechanical strength and reduce heat conduction by using smaller wall thickness;
2. the outer cylinder and the inner cylinder are respectively used for vacuum maintenance and liquid helium storage, the outer surface of the inner cylinder is wrapped with a cold screen consisting of a gridding metal coating radiation-proof screen and a fiber mesh staggered structure, cage-shaped metal wires are wrapped in the cold screen with a composite structure at intervals of a certain number of layers, the upper ends of the cage-shaped metal wires are fixed on the outer surface of the neck pipe on the inner cylinder, and cold helium gas exchanges heat with the inner wall of the neck pipe in the process of moving from bottom to top so as to cool a cage-shaped metal cover consisting of the metal wires with high heat conductivity;
3. a cold screen formed by a gridding metal coating radiation-proof screen capable of transmitting electromagnetic waves and a fiber mesh staggered structure is wrapped between the inner cylinder and the outer cylinder lower bottom plate, so that the radiant heat of the outer cylinder lower bottom plate to the inner cylinder lower bottom plate is avoided, and the influence on the detection precision of the superconducting sensor is avoided. The low heat leakage plug is composed of a multistage radiation-proof screen made of metal, a vacuum container made of composite materials, a liquid conveying pipe made of composite materials and a nut made of composite materials, and heat radiated to liquid helium from an opening at the upper end of the Dewar is further reduced.
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 an outer barrel according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a metal cap according to an embodiment of the present invention;
fig. 5 is a schematic view of a low heat leakage plug according to an embodiment of the present invention.
In the figure: 1. an inner barrel; 11. an inner cylinder cylindrical shell; 12. a neck tube; 13. a disc-shaped lower bottom plate of the inner cylinder; 2. an outer cylinder; 21. an outer cylinder shell; 22. a disc-shaped lower bottom plate of the outer cylinder; 3. a low heat leak plug; 31. a metal-coated radiation-proof screen; 32. a vacuum vessel; 321. a cylindrical housing; 322. a convex back cover; 33. a transfusion tube; 34. a nut; 35. a container closure; 4. a multi-stage cage-shaped metal cover; 5. the outer cylinder is provided with an upper bottom 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. 1-5, an embodiment of the present invention is shown: a composite material liquid helium Dewar using evaporative cooling helium gas to cool a cold screen comprises an inner barrel 1 for containing liquid helium; an outer cylinder 2 is arranged on the outer side of the inner cylinder 1; the inner cylinder 1 is provided with a low heat leakage plug 3 for reducing the volatilization rate of the liquid helium in the inner cylinder 1; the inner cylinder 1 is covered in the outer cylinder 2 by a metal cover 4 which is made of metal wires into a multi-stage cage shape, wherein the inner cylinder 1 and the outer cylinder 2 are both made of glass fiber reinforced epoxy resin composite materials, and a space formed between the inner cylinder 1 and the outer cylinder 2 is used for keeping vacuum; the composite material liquid helium Dewar using the evaporative cooling helium gas to cool the cold screen can keep less than or equal to 10 for a long time-3Pa high vacuum, and leakage rate of less than 1 × 10 under 0.1MPa of absolute internal pressure of helium gas after 50 cold and heat cycles between room temperature and liquid nitrogen temperature-9Pa·m3/s。
The inner cylinder 1 comprises an inner cylinder cylindrical shell 11 which is integrally woven by adopting glass fibers and is cured and formed by impregnating epoxy resin through vacuum pressure, a neck pipe 12 and an inner cylinder disc-shaped lower bottom plate 13, wherein the neck pipe 12 is used for fixing the metal cover 4 on the inner cylinder 1; the inner cylinder 1 and the outer cylinder 2 are woven by glass fibers and are cured and formed by impregnating epoxy resin under vacuum pressure, and the air gap rate of the material is less than 1%.
The outer cylinder 2 comprises an outer cylinder cylindrical shell 21 and an outer cylinder disc-shaped lower bottom plate 22, wherein the outer cylinder cylindrical shell 21 and the outer cylinder disc-shaped lower bottom plate 22 are integrally woven by adopting glass fibers and are formed by impregnating epoxy resin through vacuum pressure and curing, a space for keeping vacuum is formed between the outer cylinder cylindrical shell 21 and the inner cylinder cylindrical shell 11, and the upper end of the outer cylinder 2 is sealed through an arranged outer cylinder upper bottom plate 5, so that the vacuum keeping of the space is realized; the outer surface of the outer cylinder disc-shaped lower bottom plate 22 can be a cold screen formed by a gridded metal coating radiation-proof screen capable of transmitting electromagnetic waves and a fiber net, so that the radiation heat of the outer cylinder disc-shaped lower bottom plate 22 to the inner cylinder disc-shaped lower bottom plate 13 is greatly reduced, and the electromagnetic noise cannot be brought to the superconducting sensor.
The low heat leakage plug 3 comprises a metal radiation-proof screen 31, a cylindrical vacuum container 32 made of composite material, a hollow thin-walled infusion tube 33 with external threads at the lower end and a nut 34 made of composite material; one end of the infusion tube 33 is connected with a container cover plate 35, and the other end of the infusion tube 33 passes through the nut 34, extends towards the bottom of the vacuum container 32 and penetrates through the bottom of the vacuum container 32; the radiation-proof screen 31 is positioned inside the vacuum container 32 and is sleeved on the infusion tube 33; the low heat leakage plug 3 consists of a metal coating anti-radiation screen 31, a vacuum container 32 made of composite material, a transfusion tube 33 made of composite material and a nut 34 made of composite material, wherein the transfusion tube 33 made of composite material has the functions of transfusion and air outlet at the same time
Wherein, the vacuum container 32 comprises a cylindrical shell 321 and a convex back cover 322, and the wall thickness of the two is 15 mm; the container cover plate 35 is hermetically connected with the cylindrical shell 321 through a threaded structure; the infusion tube 33 is hermetically connected with the outer convex back cover 322 through a thread structure; the nut 34 is located inside the vacuum container 32 and presses the center of the inner surface of the outer convex back cover 322 to reinforce the strength of the center of the outer convex back cover 322.
The metal cover 4 is wrapped in a metal coating anti-radiation screen capable of transmitting electromagnetic waves and a heat radiation prevention cold screen formed by interlacing a glass silk screen.
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 using evaporative cooling helium gas to cool a cold shield is characterized in that: comprises an inner cylinder (1) for containing liquid helium; an outer cylinder (2) is arranged on the outer side of the inner cylinder (1);
a low heat leakage plug (3) for reducing the volatilization rate of the liquid helium in the inner cylinder (1) is arranged on the inner cylinder (1);
and the inner cylinder (1) is covered in the outer cylinder (2) by a metal cover (4) which is made of metal wires into a multi-stage cage shape, wherein the inner cylinder (1) and the outer cylinder (2) are both made of glass fiber reinforced epoxy resin composite materials, and a space formed between the inner cylinder (1) and the outer cylinder (2) is used for keeping vacuum.
2. A composite liquid helium dewar for cooling a cold shield with boil-off cold helium gas according to claim 1, wherein: the inner cylinder (1) comprises an inner cylinder cylindrical shell (11) which is integrally woven by adopting glass fibers and cured and formed by impregnating epoxy resin through vacuum pressure, a neck pipe (12) and an inner cylinder disc-shaped lower bottom plate (13), wherein the neck pipe (12) is used for fixing the metal cover (4) on the inner cylinder (1).
3. A composite liquid helium dewar for cooling a cold shield with boil-off cold helium gas according to claim 2 wherein: the outer cylinder (2) comprises an outer cylinder cylindrical shell (21) and an outer cylinder disc-shaped lower bottom plate (22), wherein the outer cylinder cylindrical shell (21) is integrally woven by adopting glass fibers and is formed by vacuum pressure impregnation epoxy resin curing, a space for keeping vacuum is formed between the outer cylinder cylindrical shell (21) and the inner cylinder cylindrical shell (11), and the upper end of the outer cylinder (2) is sealed through an outer cylinder upper bottom plate (5) arranged on the outer cylinder upper bottom plate, so that vacuum keeping of the space is realized.
4. The ultra-thin liquid helium dewar of claim 1, 2 or 3, wherein the liquid helium comprises a composite material of evaporative cold helium gas cooling cold shield, and wherein: the low heat leakage plug (3) comprises a metal radiation-proof screen (31), a cylindrical vacuum container (32) made of composite material and a hollow thin-walled infusion tube (33) and a nut (34) made of composite material, wherein the lower end of the infusion tube is provided with external threads; one end of the infusion tube (33) is connected with a container cover plate (35) and the other end of the infusion tube (33) passes through the nut (34) and extends to the bottom of the vacuum container (32) and penetrates through the bottom of the vacuum container (32); the radiation-proof screen (31) is positioned in the vacuum container (32) and is sleeved on the infusion tube (33).
5. The composite ultrathin liquid helium dewar for cooling a cold shield by using evaporative cold helium gas as claimed in claim 4, wherein: the vacuum container (32) comprises a cylindrical shell (321) and a convex back cover (322), and the wall thickness of the cylindrical shell and the convex back cover are 15 mm; the container cover plate (35) is hermetically connected with the cylindrical shell (321) through a threaded structure; the infusion tube (33) is hermetically connected with the convex back cover (322) through a thread structure; the nut (34) is positioned inside the vacuum container (32) and compresses the center of the inner surface of the convex back cover (322) to enhance the strength of the center of the convex back cover (322).
6. The composite ultrathin liquid helium dewar for cooling a cold shield by using evaporative cold helium gas as claimed in claim 1, wherein: the metal cover (4) is wrapped in a heat radiation resistant cold screen which is formed by a metal coating radiation resistant screen capable of transmitting electromagnetic waves and a glass silk screen in a staggered mode.
CN202010288769.3A 2020-04-14 2020-04-14 Composite material liquid helium Dewar using evaporative cooling helium gas to cool cold screen Pending CN111473244A (en)

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CN202010288769.3A CN111473244A (en) 2020-04-14 2020-04-14 Composite material liquid helium Dewar using evaporative cooling helium gas to cool cold screen

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CN202010288769.3A CN111473244A (en) 2020-04-14 2020-04-14 Composite material liquid helium Dewar using evaporative cooling helium gas to cool cold screen

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Cited By (1)

* 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

Cited By (1)

* 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

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