CN112797309A - Liquid helium dewar - Google Patents
Liquid helium dewar Download PDFInfo
- Publication number
- CN112797309A CN112797309A CN202011599855.2A CN202011599855A CN112797309A CN 112797309 A CN112797309 A CN 112797309A CN 202011599855 A CN202011599855 A CN 202011599855A CN 112797309 A CN112797309 A CN 112797309A
- Authority
- CN
- China
- Prior art keywords
- cavity
- liquid helium
- liquid
- liquid nitrogen
- helium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/01—Shape
- F17C2201/0104—Shape cylindrical
-
- 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
- F17C2201/035—Orientation with substantially horizontal 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
- F17C2203/0391—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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention relates to a liquid helium dewar, which comprises a vacuum cover, a liquid nitrogen cavity, a liquid nitrogen cold screen, a liquid helium cavity, a vacuum layer, a suspender and a radiation-proof screen; the liquid helium cavity is arranged in the vacuum cover, an opening at the top of the liquid helium cavity is hermetically fixed at the top of the interior of the vacuum cover, and a vacuum layer is formed between the liquid helium cavity and the vacuum cover; the liquid nitrogen cavity is concentrically wound outside the liquid helium cavity and is arranged in the vacuum cover, the liquid nitrogen cold screen is sleeved outside the liquid helium cavity and is positioned in the vacuum layer, the opening at the top of the liquid nitrogen cold screen is fixed at the bottom of the liquid nitrogen cavity and is in heat conduction connection with the liquid nitrogen cavity, and the inner wall of the liquid nitrogen cold screen is spaced from the outer wall of the liquid helium cavity by a certain distance; the liquid helium storage device has the advantages that the liquid helium cavity is insulated by virtue of the liquid nitrogen cavity and the liquid nitrogen cold screen, so that the low-temperature environment can be maintained for a long time to effectively reduce the volatilization of the liquid helium, the storage time of the liquid helium is greatly prolonged, the radiation heat leakage of the liquid helium is greatly reduced by virtue of the plurality of radiation-proof screens, the liquid helium can be supplemented even in the middle of an experiment with extremely high vibration requirement, and further, the liquid helium storage device can be used for experiments with long duration to expand the application range.
Description
Technical Field
The invention relates to a liquid helium dewar.
Background
Some scientific experiments need to be carried out in a liquid helium environment, wherein soaking a sample in liquid helium is a common method for obtaining a low-temperature environment, a liquid helium dewar is a low-temperature container for containing liquid helium, and existing liquid helium dewars are all insulated by adopting a steam-cooled multilayer cold shield and combining a vacuum heat-insulating material.
Disclosure of Invention
In view of the above-mentioned current situation of the prior art, the present invention provides a liquid helium dewar capable of maintaining a low temperature environment for a long time to effectively reduce volatilization of liquid helium, thereby greatly prolonging the storage time of liquid helium, and greatly reducing radiation heat leakage of liquid helium to expand the application range.
The technical scheme adopted by the invention for solving the technical problems is as follows: a liquid helium Dewar is characterized by comprising a vacuum cover, a liquid nitrogen cavity, a liquid nitrogen cold screen, a liquid helium cavity, a vacuum layer, a suspender and a radiation-proof screen; the liquid helium cavity is arranged in the vacuum cover, an opening at the top of the liquid helium cavity is hermetically fixed at the top of the interior of the vacuum cover, and a vacuum layer is formed between the liquid helium cavity and the vacuum cover; the liquid nitrogen cavity is concentrically wound outside the liquid helium cavity and is arranged in the vacuum cover, the hanging rods comprise a plurality of hanging rods, the hanging rods are fixed between the top of the liquid nitrogen cavity and the top of the inside of the vacuum cover at equal angles along the circumferential direction, the liquid nitrogen cold screen is sleeved outside the liquid helium cavity and is positioned in the vacuum layer, an opening at the top of the liquid nitrogen cold screen is fixed at the bottom of the liquid nitrogen cavity and is in heat conduction connection with the liquid nitrogen cavity, and a certain distance is reserved between the inner wall of the liquid nitrogen cold screen and the outer wall of the liquid helium cavity; the radiation protection screen includes a plurality ofly, it is a plurality of the radiation protection screen all cup joints on the outer wall in liquid helium chamber and along vertical direction equidistant distribution.
Preferably, the number of the radiation protection screens is 3-10.
Preferably, the outer walls of the liquid nitrogen cavity, the liquid nitrogen cold screen and the liquid helium cavity are coated with adsorption layers.
Compared with the prior art, the invention has the advantages that: the liquid helium storage device has the advantages that the liquid helium cavity is insulated by virtue of the liquid nitrogen cavity and the liquid nitrogen cold screen, so that the low-temperature environment can be maintained for a long time to effectively reduce the volatilization of the liquid helium, the storage time of the liquid helium is greatly prolonged, the radiation heat leakage of the liquid helium is greatly reduced by virtue of the plurality of radiation-proof screens, the liquid helium can be supplemented even in the middle of an experiment with extremely high vibration requirement, and further, the liquid helium storage device can be used for experiments with long duration to expand the application range.
Drawings
FIG. 1 is a sectional view showing the structure of the present invention.
Detailed Description
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention have been omitted.
As shown in fig. 1, a liquid helium dewar comprises a vacuum cover 1, a liquid nitrogen cavity 2, a liquid nitrogen cold screen 3, a liquid helium cavity 4, a vacuum layer 5, a hanger rod 6 and a radiation-proof screen 7; the liquid helium cavity 4 is arranged in the vacuum cover 1, the opening at the top of the liquid helium cavity 4 is hermetically fixed at the top of the interior of the vacuum cover 1, and a vacuum layer 5 is formed between the liquid helium cavity 4 and the vacuum cover 1; the liquid nitrogen chamber 2 concentric ring is around outside the liquid helium chamber 4 and locate in vacuum hood 1, jib 6 includes a plurality ofly, a plurality of jibs 6 along the inside top of fixing of the equal angle of circumferencial direction at liquid nitrogen chamber 2 and vacuum hood 1, 3 covers of liquid nitrogen cold screen are established outside and in vacuum layer 5 in the liquid helium chamber 4, the open-top department of liquid nitrogen cold screen 3 fixes in the bottom of liquid nitrogen chamber 2 and is connected with the heat conduction of liquid nitrogen chamber 2, the inner wall of liquid nitrogen cold screen 3 and the outer wall interval of liquid helium chamber 4 keep a certain distance apart.
The radiation protection screens 7 comprise a plurality of radiation protection screens 7 which are all sleeved on the outer wall of the liquid helium cavity 4 and are distributed at equal intervals along the vertical direction.
The number of the radiation protection screens 7 is 3-10.
And the outer walls of the liquid nitrogen cavity 2, the liquid nitrogen cold screen 3 and the liquid helium cavity 4 are all coated with an adsorption layer 8.
The working principle is as follows: under the normal working state, the vacuum degree in the vacuum layer 5 is between 10 & lt-6 & gt Pa and 10 & lt-3 & gt Pa; liquid nitrogen is filled in the liquid nitrogen cavity 2, the coldness of the liquid nitrogen cavity 2 is transmitted to the liquid nitrogen cold screen 3, and the liquid nitrogen cold screen 3 can ensure that the low-temperature of the liquid nitrogen cold screen can be maintained as long as liquid nitrogen is in the liquid nitrogen cavity 2, so that the radiation heat leakage of the liquid nitrogen cold screen 3 to the liquid helium cavity is reduced; in the process that the cold helium gas evaporated in the liquid helium cavity 4 is discharged out of the liquid helium cavity 4, the cold helium gas sequentially passes through the plurality of radiation-proof screens 7, and the plurality of radiation-proof screens 7 form a temperature gradient along the arrangement direction, so that the radiation heat leakage in the area from the opening at the top of the liquid helium cavity 4 to the surface of the liquid helium can be reduced to a great extent; the adsorption layer 8 is made of an adsorption material, and can effectively maintain the static vacuum of the vacuum layer 5.
The liquid helium storage device realizes heat preservation of the liquid helium cavity 4 by virtue of the liquid nitrogen cavity 2 and the liquid nitrogen cold screen 3, further can maintain a low-temperature environment for a long time to effectively reduce volatilization of liquid helium, thereby greatly prolonging the storage time of the liquid helium, and greatly reduces radiation heat leakage of the liquid helium by virtue of the plurality of radiation-proof screens 7, so that the liquid helium can be supplemented even in the middle of an experiment with extremely high vibration requirement, and further can be used for experiments with long duration to expand the application range.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A liquid helium Dewar is characterized by comprising a vacuum cover, a liquid nitrogen cavity, a liquid nitrogen cold screen, a liquid helium cavity, a vacuum layer, a suspender and a radiation-proof screen; the liquid helium cavity is arranged in the vacuum cover, an opening at the top of the liquid helium cavity is hermetically fixed at the top of the interior of the vacuum cover, and a vacuum layer is formed between the liquid helium cavity and the vacuum cover; the liquid nitrogen cavity is concentrically wound outside the liquid helium cavity and is arranged in the vacuum cover, the hanging rods comprise a plurality of hanging rods, the hanging rods are fixed between the top of the liquid nitrogen cavity and the top of the inside of the vacuum cover at equal angles along the circumferential direction, the liquid nitrogen cold screen is sleeved outside the liquid helium cavity and is positioned in the vacuum layer, an opening at the top of the liquid nitrogen cold screen is fixed at the bottom of the liquid nitrogen cavity and is in heat conduction connection with the liquid nitrogen cavity, and a certain distance is reserved between the inner wall of the liquid nitrogen cold screen and the outer wall of the liquid helium cavity; the radiation protection screen includes a plurality ofly, it is a plurality of the radiation protection screen all cup joints on the outer wall in liquid helium chamber and along vertical direction equidistant distribution.
2. The liquid helium dewar according to claim 1, wherein the number of the radiation protection screens is 3-10.
3. The liquid helium dewar of claim 1, wherein the outer walls of the liquid nitrogen cavity, the liquid nitrogen cold shield and the liquid helium cavity are coated with adsorption layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011599855.2A CN112797309A (en) | 2020-12-29 | 2020-12-29 | Liquid helium dewar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011599855.2A CN112797309A (en) | 2020-12-29 | 2020-12-29 | Liquid helium dewar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112797309A true CN112797309A (en) | 2021-05-14 |
Family
ID=75804186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011599855.2A Pending CN112797309A (en) | 2020-12-29 | 2020-12-29 | Liquid helium dewar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112797309A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010040447A1 (en) * | 2000-02-03 | 2001-11-15 | Hiroyuki Tanaka | Dewar and biological magnetism measurement apparatus using the dewar |
| CN202521942U (en) * | 2012-04-12 | 2012-11-07 | 苏州市职业大学 | Low-temperature refrigerating device used for measuring internal friction of audio frequency |
| CN204943012U (en) * | 2015-08-05 | 2016-01-06 | 大连齐维科技发展有限公司 | A kind of cooled cryostat chamber |
| CN106871546A (en) * | 2017-02-08 | 2017-06-20 | 中国科学院合肥物质科学研究院 | A kind of loss biological specimen of liquid nitrogen zero freezes the freezing chamber of tank |
| CN107478913A (en) * | 2017-07-26 | 2017-12-15 | 中国科学院高能物理研究所 | A kind of superconductor cavity vertical checkout insert |
| CN111237632A (en) * | 2020-03-11 | 2020-06-05 | 安徽因速丹电气有限责任公司 | Composite liquid helium dewar with liquid nitrogen cold screen |
| CN111473244A (en) * | 2020-04-14 | 2020-07-31 | 沛县佳苑创业投资有限责任公司 | Composite material liquid helium Dewar using evaporative cooling helium gas to cool cold screen |
-
2020
- 2020-12-29 CN CN202011599855.2A patent/CN112797309A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010040447A1 (en) * | 2000-02-03 | 2001-11-15 | Hiroyuki Tanaka | Dewar and biological magnetism measurement apparatus using the dewar |
| CN202521942U (en) * | 2012-04-12 | 2012-11-07 | 苏州市职业大学 | Low-temperature refrigerating device used for measuring internal friction of audio frequency |
| CN204943012U (en) * | 2015-08-05 | 2016-01-06 | 大连齐维科技发展有限公司 | A kind of cooled cryostat chamber |
| CN106871546A (en) * | 2017-02-08 | 2017-06-20 | 中国科学院合肥物质科学研究院 | A kind of loss biological specimen of liquid nitrogen zero freezes the freezing chamber of tank |
| CN107478913A (en) * | 2017-07-26 | 2017-12-15 | 中国科学院高能物理研究所 | A kind of superconductor cavity vertical checkout insert |
| CN111237632A (en) * | 2020-03-11 | 2020-06-05 | 安徽因速丹电气有限责任公司 | Composite liquid helium dewar with liquid nitrogen cold screen |
| CN111473244A (en) * | 2020-04-14 | 2020-07-31 | 沛县佳苑创业投资有限责任公司 | Composite material liquid helium Dewar using evaporative cooling helium gas to cool cold screen |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10928007B2 (en) | Transport container | |
| US2643022A (en) | Radiation shield supports in vacuum insulated containers | |
| GB2440350A (en) | Arrangement for suspending a cryogen vessel within an outer vacuum container | |
| DK162491B (en) | Thermally insulated container | |
| JP6881710B2 (en) | Insulation container and heat and cold insulation device using it | |
| JP6909634B2 (en) | Cryogenic gas storage tank | |
| JP6378388B2 (en) | Vacuum insulated container for low temperature | |
| US10801670B2 (en) | Transport container | |
| GB1167902A (en) | Vacuum Insulated Vessels. | |
| CN112797309A (en) | Liquid helium dewar | |
| JP2022524347A (en) | Transport container and method | |
| US3191795A (en) | Vacuum insulated vessels | |
| CN106062905A (en) | A cryostat for superconducting devices | |
| US10711945B2 (en) | Transport container | |
| CN114383035B (en) | Ultralow-temperature liquefied gas pressure container and heat insulation method | |
| US3303667A (en) | Cryogenic apparatus | |
| US20230141678A1 (en) | Cryostat Structure for Magnetic Resonance Imaging Apparatus, and Magnetic Resonance Imaging Apparatus | |
| US3191794A (en) | Protective handle for thermally insulated bulk storage container | |
| US3406857A (en) | Insulated plastic vessel | |
| CN207721054U (en) | A kind of storage device of candidate stem cell | |
| CN213988465U (en) | Low-temperature retainer and nuclear magnetic resonance imaging equipment | |
| CN105416867B (en) | Hold the container of superconductive device | |
| US3211318A (en) | Vessel for cryogenic fluids | |
| JPS5945878B2 (en) | cryostat | |
| CN214332300U (en) | Liquid nitrogen dewar inner bag support ring and contain its liquid nitrogen dewar |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210514 |
|
| RJ01 | Rejection of invention patent application after publication |