CN101498538A - Double-coil pipe cold steam refrigerating low-loss liquid helium Dewar - Google Patents
Double-coil pipe cold steam refrigerating low-loss liquid helium Dewar Download PDFInfo
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- CN101498538A CN101498538A CNA2009101161758A CN200910116175A CN101498538A CN 101498538 A CN101498538 A CN 101498538A CN A2009101161758 A CNA2009101161758 A CN A2009101161758A CN 200910116175 A CN200910116175 A CN 200910116175A CN 101498538 A CN101498538 A CN 101498538A
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Abstract
The invention relates to a low-loss liquid helium Dewar for the refrigeration of the cold vapor of double pipe coils, belonging to the liquid helium Dewar. The low-loss liquid helium Dewar comprises a shell, a liner, a bottleneck, a cold screen, a first helium outlet tube and a second helium outlet tube, wherein the liner is arranged in the shell, both ends of the bottleneck are respectively connected to the top of the liner and the top of the shell, the inner part of the liner is communicated with the outer part of the shell through the bottleneck, the first helium outlet tube is coiled on the bottleneck, both ends of the first helium outlet tube are communicated with the inner part of the liner and the outer part of the shell, the liner is covered by the cold screen, the second helium outlet tube is coiled on the cold screen, both ends of the second helium outlet tube are communicated with the inner part of the liner and the outer part of the shell, and vacuum exists between the outer part of the liner and the inner surface of the shell. The bottleneck can extend from the top of the liner to the bottom of the liner and be hermetically connected with the bottom of the liner, and the bottleneck can be made by a ripple tube. The invention uses two helium outlet tubes to nicely improve the cooling of the cold screen and the bottleneck and reduce the evaporation rate of helium. The flow quantity of both helium outlet tubes can be independently controlled, the best velocity ratio can be adjusted according to actual situation to obtain the best cooling effect without complex and unreliable self-consistent calculation.
Description
Technical field
The present invention relates to liquid helium Dewar, particularly a kind of low-loss liquid helium Dewar of double-coil pipe cold steam refrigerating.
Background technology
The purpose of liquid helium Dewar is can provide the usefulness of low temperature environment for scientific experiment for a long time for (1) can store liquid helium (2) for a long time.These 2 all require the helium evaporation rate of liquid helium Dewar to be in reduced levels.Along with the progress of science, the particularly raising of nanometer microcosmic science and technology has had new requirement again to liquid helium Dewar, i.e. the interference that (3) extremely low vibrations or not with the precision experiment of guaranteeing to carry out in Dewar.The helium evaporation rate that reduces Dewar also helps to reduce the vibrations of Dewar.
Existing reduction liquid helium Dewar helium evaporation rate technology mainly contains following several: (1) uses the outer Dewar of liquid nitrogen precooling, shortcoming is that liquid nitrogen is heavier, its volatilization can bring bigger Dewar vibrations, and need to replenish continually liquid nitrogen, low-temperature measurement is produced considerable influence and inconvenience, and it is superseded that this technology has been tending towards; (2) cold screen technology: utilize the feasible radiant heat that enters into inner bag of the cold steam cooling dome of the helium that evaporates in the inner bag cold screen outside the tank to reduce, perhaps cool off bottleneck between inner bag and the shell and make and to conduct into by bottleneck that the conduction heat of inner bag reduces, perhaps the cold screen of cooling cools off bottleneck again and makes radiant heat and conduction heat all reduce earlier.
The shortcoming of above-mentioned cold screen technology is: radiation is leaked heat and can not be taken into account well with conductive heat leakage.Even used the cold screen of above-mentioned cooling earlier to cool off the technology that this cold screen of bottleneck is connected with bottleneck and cooled off again, owing to become hotter after the cold steam of helium has cooled off cold screen, can not cool off bottleneck more well to stop the conductive heat leakage of bottleneck largely, this still is a method of favouring one and slighting the other.Because it all is the rich and influential family that Dewar leaks heat with conductive heat leakage that heat is leaked in radiation, the Dewar that this result who favours one and slights the other causes making with cold screen technology can not ease down to reduced levels to the helium evaporation rate.Higher helium evaporation rate is a kind of great waste to the helium of scarce resource not only, also makes the important low temperature test that much need carry out for a long time or need to carry out under ultralow vibration environment to carry out.
Summary of the invention
In order to solve the defective that can not finely take into account radiation leakage heat and conductive heat leakage that exists in the existing cold screen technology of liquid helium Dewar, produce and to take into account the low-loss liquid helium Dewar that the double-coil pipe cold steam refrigerating of heat and conductive heat leakage is leaked in radiation better.
The present invention realizes that the technical scheme of the low-loss liquid helium Dewar of double-coil pipe cold steam refrigerating is:
The low-loss liquid helium Dewar of double-coil pipe cold steam refrigerating of the present invention, comprise shell, inner bag, bottleneck and cold screen, it is characterized in that also comprising the first helium escape pipe and the second helium escape pipe, inner bag places enclosure, the two ends of described bottleneck connect the top of inner bag and the top of shell respectively, inner bag inside communicates with housing exterior by bottleneck, the described first helium escape pipe coils on bottleneck, its two ends are communicated with inner bag inside and housing exterior, described cold screen places between inner bag and the shell, the described second helium escape pipe coils on cold screen, and its two ends are communicated with inner bag inside and housing exterior, are vacuum between inner bag outside and the inner surface of outer cover.
The low-loss liquid helium Dewar of double-coil pipe cold steam refrigerating of the present invention, its feature also is:
Described bottleneck stretches to inner bag bottom and sealing-in bottom inner bag from the inner bag top, the part that inner bag inside is in the bottleneck communicates with housing exterior, and can set up a gas tube of taking out that is communicated with bottleneck inside and housing exterior.
Set up the helium liquid injection pipe between described inner bag top and the cover top portion.
The described first helium escape pipe has been set up the gas flow rate control valve at the port of housing exterior.
The described second helium escape pipe has been set up the gas flow rate control valve at the port of housing exterior.
Twine aluminium-plated film of multilayer and vacuum insulation fibrous paper alternately between described inner bag and the cold screen and/or between cold screen and the shell.
The inner bag top that is in of described bottleneck is a bellows to the part between the cover top portion.
The operation principle of the low-loss liquid helium Dewar of double-coil pipe cold steam refrigerating of the present invention is:
The cold helium that evaporates in the inner bag is drawn by two helium escape pipes, but not draws as traditional single tube, and wherein the first helium escape pipe is coiled in and is used for cooling off bottleneck on the bottleneck, and the second helium escape pipe is coiled in and is used for cooling off cold screen on the cold screen.Because cold screen and bottleneck all are by special-purpose helium escape pipe cooling, but not as tradition connect with single helium escape pipe and cool off cold screen and bottleneck, so the cooling of cold screen and bottleneck has obtained taking into account better among the present invention.The described first helium escape pipe and/or the second helium escape pipe all can be set up the gas flow rate control valve in the exit, the flow velocity of cold steam in its pipe of independent control, thereby can be from experimentally adjusting optimized cold steam flow speed ratio, further improved taking into account of heat and conductive heat leakage leaked in radiation, realized lower liquid helium loss.Also avoided complexity and the low self-consistency of reliability required in the conventional art to calculate.
Described bottleneck can stretch to from the inner bag top inner bag bottom and with inner bag bottom sealing-in, the boiling that can reduce liquid helium is to experimental provision produced in the bottleneck vibrations.Being in the inner bag top and can making of bellows to the part between the cover top portion of described bottleneck further reduces the conductive heat leakage of bottleneck.In bottleneck, import a small amount of helium by the gas tube of taking out that is communicated with bottleneck and Dewar housing exterior as heat-exchange gas, can be preferably to being in the experimental provision cooling of bottleneck bottom.
According to above-mentioned principle as can be seen, compared with the prior art, beneficial effect of the present invention is embodied in:
(1) uses two helium escape pipes, can take into account the cooling of cold screen and the cooling of bottleneck, thereby reduce the helium evaporation rate.
(2) flow of described two helium escape pipes can independently be controlled, and recently obtains best cooling effect thereby can specifically adjust optimum flow rate according to actual conditions, realizes minimum liquid helium loss, does not need to carry out complexity and insecure from being in harmony calculating.
(3) bottleneck can stretch into inner bag bottom always and obtain a low temperature environment of isolating with liquid helium with inner bag bottom sealing-in, and the boiling of having avoided liquid helium is collided measuring instrument and the vibration problems brought.
(4) being in the inner bag top and can making of bellows to the part between the cover top portion of bottleneck further reduces the conductive heat leakage from bottleneck.
Description of drawings
Fig. 1 is the low-loss liquid helium Dewar structural representation with basic model double-coil pipe cold steam refrigerating of the present invention.
Fig. 2 is the low-loss liquid helium Dewar structural representation with the double-coil pipe cold steam refrigerating of bottleneck of the present invention and inner bag bottom sealing-in.
Fig. 3 is to be the low-loss liquid helium Dewar structural representation of the double-coil pipe cold steam refrigerating of bellows with bottleneck of the present invention.
Number in the figure: 1 shell, 2 inner bags, 3, bottleneck, 4 first helium escape pipes, 5 second helium escape pipes, 6 cold screens, 7 are taken out gas tube, 8 helium liquid injection pipes
Below the invention will be further described by the specific embodiment and structure accompanying drawing.
The specific embodiment
Embodiment 1: the low-loss liquid helium Dewar of basic model double-coil pipe cold steam refrigerating
Referring to Fig. 1, the low-loss liquid helium Dewar of basic model double-coil pipe cold steam refrigerating of the present invention, comprise shell 1, inner bag 2, bottleneck 3 and cold screen 6, it is characterized in that also comprising the first helium escape pipe 4 and the second helium escape pipe 5, inner bag 2 places shell 1 inside, the two ends of described bottleneck 3 connect the top of inner bag 2 and the top of shell 1 respectively, inner bag 2 is inner by bottleneck 3 and shell 1 exterior, the described first helium escape pipe dish 4 is around on the bottleneck 3, its two ends are communicated with inner bag 2 inner and shell 1 outsides, described cold screen 6 places between inner bag 2 and the shell 1, the described second helium escape pipe dish 5 is around on the cold screen 6, its two ends are communicated with inner bag 2 inner and shell 1 outsides, are vacuum between inner bag 2 outsides and shell 1 inner surface.
The operation principle of present embodiment is as follows:
Owing to various parts of leaking the hot helium steam that produces are directly twined on bottleneck 3 by the first helium escape pipe 4, can reduce the temperature of bottleneck 3 largely, thereby the solid conduction that reduces largely from the room temperature to the liquid helium is leaked heat, and another part of helium steam is by the coiling on cold screen 6 of the second helium escape pipe, 5 backs, also can reduce the temperature of cold screen 6 largely, leak heat thereby reduce from shell 1 to inner bag 2 radiation largely.
In the foregoing description, the gas flow rate control valve is set up in port in shell 1 outside of the first helium escape pipe 4 and/or the second helium escape pipe 5, control the relative velocity of cold steam in the first helium escape pipe 4 and second escape pipe 5, thereby obtain optimized cold steam flow speed ratio, realize lower liquid helium loss.
Embodiment 2: the low-loss liquid helium Dewar of the double-coil pipe cold steam refrigerating of bottleneck and inner bag bottom sealing-in
In the foregoing description 1, the vibrations that with the boiling that reduces liquid helium measuring instrument brought for the no liquid helium cavity of the low temperature that comes out in inner bag 2 internal insulation, with bottleneck 3 stretch into inner bag 2 bottoms and with the bottom sealing-in of inner bag 2, referring to Fig. 2.Also can set up a helium liquid injection pipe 8 that is communicated with inner bag 2 tops and shell 1 top and conveniently in inner bag 2, replenish liquid helium, also can set up simultaneously one be communicated with inner and shell 1 outside of bottleneck 3 take out gas tube 7, be used in bottleneck 3, charging into a certain amount of helium and carry out heat exchange, the experimental provision in this isolated chambers is lowered the temperature preferably.
Embodiment 3: bottleneck is the low-loss liquid helium Dewar of the double-coil pipe cold steam refrigerating of bellows
In the foregoing description 1 and 2, for further reduce by bottleneck 3 from shell 1 to inner bag 2 solid conduction leak heat, it is described that bottleneck 13 uses wall thickness thinner from inner bag 2 to shell, the bellows that heat conduction effective length is longer replaces, referring to Fig. 3.
Claims (8)
1, a kind of low-loss liquid helium Dewar of double-coil pipe cold steam refrigerating, comprise shell, inner bag, bottleneck and cold screen, it is characterized in that also comprising the first helium escape pipe and the second helium escape pipe, inner bag places enclosure, the two ends of described bottleneck connect the top of inner bag and the top of shell respectively, inner bag inside communicates with housing exterior by bottleneck, the described first helium escape pipe coils on bottleneck, its two ends are communicated with inner bag inside and housing exterior, described cold screen places between inner bag and the shell and covers inner bag, the described second helium escape pipe coils on cold screen, and its two ends are communicated with inner bag inside and housing exterior, are vacuum between inner bag outside and the inner surface of outer cover.
2, the low-loss liquid helium Dewar of double-coil pipe cold steam refrigerating according to claim 1 is characterized in that described bottleneck stretches to inner bag bottom and sealing-in bottom inner bag from the inner bag top, and the part that inner bag inside is in the bottleneck communicates with housing exterior.
3, the low-loss liquid helium Dewar of double-coil pipe cold steam refrigerating according to claim 1 is characterized in that setting up between described inner bag top and the cover top portion helium liquid injection pipe.
4, the low-loss liquid helium Dewar of double-coil pipe cold steam refrigerating according to claim 1 is characterized in that the described first helium escape pipe set up the gas flow rate control valve at the port of housing exterior.
5, the low-loss liquid helium Dewar of double-coil pipe cold steam refrigerating according to claim 1 is characterized in that the described second helium escape pipe set up the gas flow rate control valve at the port of housing exterior.
6,, it is characterized in that between described inner bag and the cold screen and/or winding aluminium-plated film of multilayer and vacuum insulation fibrous paper alternately between cold screen and the shell according to the low-loss liquid helium Dewar of claim 1 or 2 or 3 or 4 or 5 described double-coil pipe cold steam refrigeratings.
7,, it is characterized in that the inner bag top that is in of described bottleneck is a bellows to the part between the cover top portion according to the low-loss liquid helium Dewar of claim 1 or 2 or 3 or 4 or 5 described double-coil pipe cold steam refrigeratings.
8, the low-loss liquid helium Dewar of double-coil pipe cold steam refrigerating according to claim 2 is characterized in that setting up a gas tube of taking out that is communicated with bottleneck inside and housing exterior.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101161758A CN101498538B (en) | 2009-02-09 | 2009-02-09 | Double-coil pipe cold steam refrigerating low-loss liquid helium Dewar |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101161758A CN101498538B (en) | 2009-02-09 | 2009-02-09 | Double-coil pipe cold steam refrigerating low-loss liquid helium Dewar |
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| CN101498538A true CN101498538A (en) | 2009-08-05 |
| CN101498538B CN101498538B (en) | 2011-06-15 |
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| CN2009101161758A Expired - Fee Related CN101498538B (en) | 2009-02-09 | 2009-02-09 | Double-coil pipe cold steam refrigerating low-loss liquid helium Dewar |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104374131A (en) * | 2014-11-20 | 2015-02-25 | 上海启元空分技术发展股份有限公司 | Cryogenic heat insulation device |
| CN106829202A (en) * | 2017-01-13 | 2017-06-13 | 蔡晨宇 | The method of constant low temperature storage system and removal Dewar fog |
| CN108533947A (en) * | 2018-05-04 | 2018-09-14 | 安徽万瑞冷电科技有限公司 | A kind of Dewar device of the low loss that evaporates |
| CN113359001A (en) * | 2020-03-04 | 2021-09-07 | 中国科学院理化技术研究所 | Chip testing system |
| CN114649129A (en) * | 2020-12-17 | 2022-06-21 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Superconducting magnet |
| CN114684506A (en) * | 2020-12-29 | 2022-07-01 | 北京航天试验技术研究所 | Horizontal container for storing cryogenic liquid |
-
2009
- 2009-02-09 CN CN2009101161758A patent/CN101498538B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104374131A (en) * | 2014-11-20 | 2015-02-25 | 上海启元空分技术发展股份有限公司 | Cryogenic heat insulation device |
| CN106829202A (en) * | 2017-01-13 | 2017-06-13 | 蔡晨宇 | The method of constant low temperature storage system and removal Dewar fog |
| CN106829202B (en) * | 2017-01-13 | 2019-05-31 | 北京华晨世纪生物技术有限公司 | Constant low temperature storage system and the method for removing Dewar fog |
| CN108533947A (en) * | 2018-05-04 | 2018-09-14 | 安徽万瑞冷电科技有限公司 | A kind of Dewar device of the low loss that evaporates |
| CN113359001A (en) * | 2020-03-04 | 2021-09-07 | 中国科学院理化技术研究所 | Chip testing system |
| CN113359001B (en) * | 2020-03-04 | 2022-07-22 | 中国科学院理化技术研究所 | Chip testing system |
| CN114649129A (en) * | 2020-12-17 | 2022-06-21 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Superconducting magnet |
| CN114684506A (en) * | 2020-12-29 | 2022-07-01 | 北京航天试验技术研究所 | Horizontal container for storing cryogenic liquid |
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| CN101498538B (en) | 2011-06-15 |
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