CN1304810C - High vacuum low temperature thermostat using low temperature leak flexible connecting structure - Google Patents
High vacuum low temperature thermostat using low temperature leak flexible connecting structure Download PDFInfo
- Publication number
- CN1304810C CN1304810C CNB200410053602XA CN200410053602A CN1304810C CN 1304810 C CN1304810 C CN 1304810C CN B200410053602X A CNB200410053602X A CN B200410053602XA CN 200410053602 A CN200410053602 A CN 200410053602A CN 1304810 C CN1304810 C CN 1304810C
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- China
- Prior art keywords
- heat sink
- connecting structure
- cryostat
- high vacuum
- flexible connecting
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- 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.)
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- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 14
- 239000010935 stainless steel Substances 0.000 claims abstract description 14
- 229910052738 indium Inorganic materials 0.000 claims abstract description 9
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000005057 refrigeration Methods 0.000 claims description 17
- 238000003466 welding Methods 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 230000010358 mechanical oscillation Effects 0.000 abstract description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
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- Containers, Films, And Cooling For Superconductive Devices (AREA)
Abstract
The present invention discloses a high vacuum cryostat by adopting a low heat-leakage flexible connection structure, which is provided with a refrigerator fixed flange. The outer side of the refrigerator fixed flange is fixed with the outer wall of the upper end of the cryostat by a bolt structure, and the inner side of the refrigerator fixed flange is welded and fixed with the outer wall of the upper end of the cryostat by a corrugated pipe. A vacuum jacket, an upper heat sink, a flexible thermal connecting structure and a lower heat sink are orderly arranged below the refractor fixed flange in the cryostat. The present invention has the advantages that the vacuum jacket adopts the forms of thin-wall stainless steel pipes, or corrugated pipes or folding sleeve pipes, etc., and has the characteristic of low heat leakage; the stainless steel bellows in a fixed structure can eliminate mechanical oscillation as a result of the operation of a low-temperature refrigerator; a cold head of the low-temperature refrigerator can have certain mechanical biasing with cooled objects due to the flexible connecting structure; indium plates which are added between the cold head and the heat sink and between the heat sink and the cooled objects can lower the contact thermal resistance of connecting pieces so as to reduce the loss of effective refrigerating capacities.
Description
Technical field
The present invention relates to a kind of high vacuum cryostat that adopts low heat leak flexible connecting structure.
Background technology
Many application scenarios (for example cooling of vacuum environment simulating chamber) need provide a low temperature environment, adopted the cryogenic liquid mode that is coiled in the coil pipe on the cooled object of flowing through to reach the cooling purpose more in the past, yet such mode complicated operation in running, and need additional liquefaction device or low temperature storage tank that a large amount of cryogenic liquids is provided, the processing of the gas after the heat exchange evaporation also is a relatively stubborn problem, high price and safety issue as cryogenic gas all require to install gas concentration unit, and this will increase the complexity of system again greatly.Under this background, the no cold-producing medium scheme that adopts Cryo Refrigerator directly to cool off has obtained application more and more widely.Compare with traditional scheme of utilizing refrigerant cools, no cold-producing medium scheme has also been brought a new problem, promptly how the cold of Cryo Refrigerator is delivered to cooled object expeditiously, this not only will overcome the mechanical stress problem that is rigidly connected and causes, and allows certain one-movement-freedom-degree at the object that requires aspect the structure installation to be cooled.In addition, also need to overcome the mechanical oscillation problem that the running by refrigeration machine brings.These problems require to provide a kind of scheme that flexibly connects of low heat leak.
Summary of the invention
The purpose of this invention is to provide a kind of high vacuum cryostat that adopts low heat leak flexible connecting structure.
It has the refrigeration machine mounting flange, the refrigeration machine mounting flange outside is fixed with the outer wall employing bolt arrangement of thermostat upper end, the inboard outer wall with the thermostat upper end of refrigeration machine mounting flange adopts the bellows welding fixing, in the thermostat, be provided with vacuum jacket under the refrigeration machine mounting flange successively, go up heat sink, flexible thermal syndeton, heat sink down.
Advantage of the present invention: vacuum jacket adopts patterns such as thin-wall stainless steel, bellows or folding sleeve pipe, has increased thermal conduction resistance and then has reduced axial heat leak, has the characteristics of low heat leak; Adopted corrugated stainless steel tubing in the fixed structure of vacuum jacket and thermostat upper end outer wall, can eliminate because the mechanical oscillation that the operation of Cryo Refrigerator brings; The cold head of Cryo Refrigerator adopts flexible connecting structure with the thermally coupled that is cooled between object, and allowing the refrigeration machine cold head and being cooled has level of freedom can realize that machinery is moving partially between object; Flexible oxygen-free copper establishment band in the flexible connecting structure with heat sink between be connected adopt silver soldering mode with the minimizing thermal contact resistance, simultaneously a common outlet passageway is ganged up and be provided with to each welding hole mutually, and the gas that can prevent to be enclosed in the welding hole progressively discharges and influences vacuum to vacuum environment; Additional indium sheet then can reduce thermal contact resistance between connector scheme the effective refrigerating capacity loss of minimizing between cold head and heat sink and heat sink and cooled object.
Description of drawings
Fig. 1 (a) is the high vacuum cryostat structure schematic diagram that adopts low heat leak flexible connecting structure;
Fig. 1 (b) is a heat sink b-b view in the present invention;
Fig. 1 (c) is a heat sink c-c view under the present invention;
Fig. 2 is the syndeton schematic diagram that vacuum jacket of the present invention adopts corrugated stainless steel tubing;
Fig. 3 is the syndeton schematic diagram that vacuum jacket of the present invention adopts the folding sleeve pipe of stainless steel.
The specific embodiment
The present invention has adopted three kinds of schemes, i.e. thin-wall stainless steel, bellows and folding sleeve pipe in order to realize the purpose of low heat leak aspect vacuum jacket.The light-wall pipe scheme (Fig. 1-3a) is to increase thermal conduction resistance by light-wall pipe, and bellows ((common ground of Fig. 3-3c) is to realize reducing the purpose of axial heat leak by increasing thermally conductive pathways for Fig. 2-3b) and folding sleeve pipe.The two kinds of schemes in back are applicable to the occasion that cryogenic temperature is lower more, are the problems that needs emphasis to solve in the system because reduce heat leak this moment, effectively utilize the cold of refrigeration machine.Meanwhile, because the thermal contact resistance between cold head and heat sink and heat sink and cooled object can cause increase and effective refrigerating capacity loss of the temperature difference between connector, adopt additional soft metal indium sheet can reduce thermal resistance.
The cold head of Cryo Refrigerator is not directly to adopt hard connecting mode with the thermally coupled that is cooled between object, but employing flexible connecting structure, be that the refrigeration machine cold head is delivered to cold heat sink by the indium sheet, then, flexible oxygen-free copper establishment band by high heat conductance is delivered to down cold heat sink, is connected to cooled object by the bolt arrangement that adds the indium sheet more at last.This flexible connection structure, allowing the refrigeration machine cold head and being cooled has level of freedom can realize that machinery is moving partially between object.
Flexible oxygen-free copper establishment band in the flexible connecting structure with heat sink between be connected adopt silver soldering mode with the minimizing thermal contact resistance.For the gas that prevents to be enclosed in the welding hole progressively discharges to vacuum environment, each welding hole is ganged up mutually, and passes through a common exit passageway with the gas in the release aperture.
Low heat leak between Cryo Refrigerator and cooled object flexibly connect scheme on the whole by Cryo Refrigerator 1, refrigeration machine fixed cover shell structure 2, vacuum jacket 3, go up heat sink 4, heat sink 6, the flexible thermal syndeton 5 and the object 7 that is cooled etc. are partly formed down.
At first Cryo Refrigerator 1 need be installed to whole system and be got on, object 7 normally is placed in the vacuum environment in the thermostat 13 owing to be cooled, installation and removal maintenance for the ease of refrigeration machine, Cryo Refrigerator part 1 has adopted an independent vacuum space 14 that is made of vacuum jacket 3, earlier vacuum jacket 3 is fixed on the outer wall 15 of vacuum environment 13 thermostats of equipping the object that is cooled, then Cryo Refrigerator 1 is fixed in the vacuum jacket 3, by the vacuum seal in the O type circle 18 realization chucks.
In order to eliminate the vibration that brought by the refrigeration machine running influence to system, vacuum jacket 3 has adopted bellows 16--bolt arrangement 17 fixing with the coupling part of thermostat outer wall 15.The sleeve pipe of vacuum jacket 3 can adopt three kinds of forms: thin-wall stainless steel straight tube 3a, corrugated stainless steel tubing 3b and stainless steel folded tube 3c etc.Both reduce heat conduction loss by the thermal resistance that increases the heat conduction approach back.The two kinds of schemes in back structurally are applicable to the occasion that cryogenic temperature is lower more, because the heat leak problem of this moment is the problem that needs emphasis to overcome in the system.In addition, bring the structural stability problem in order to prevent that rigidity is not enough when adopting bellows 3b form, the pipe thickness of corrugated stainless steel tubing 3b itself should be not less than the pipe thickness of thin-wall stainless steel straight tube 3a.
9 pairs of the cold heads of refrigeration machine be cooled object 7 cooling by last heat sink 4, heat sink 6 realize down, between additional soft metal indium sheet 8 reduce thermal contact resistance, reduce heat transfer temperature difference.Consider connected system expand with heat and contract with cold and improve with the object 7 that is cooled be connected flexibility (comprising shape and position etc.), that Cryo Refrigerator 1-goes up is heat sink 4, heat sink 6-is cooled and adopts flexible connecting structure 5 between the object 7 down, and be with 10 to connect by 9 (wherein 8 be uniformly distributed along the circumference, 1 at center) flexible oxygen-free copper establishments, its distribution mode is seen Fig. 1 (b) and Fig. 1 (c).Flexible oxygen-free copper establishment is with the mode of employing silver soldering between 10 and last heat sink 4, down heat sink 6.For the gas that prevents to be closed in the welding hole progressively discharges to vacuum environment, the vacuum environment around the influence, each welding hole is ganged up mutually, and passes through a common exit passageway 12 with the gas in the release aperture.Heat sink 6 adopt bolting with the connection of 7 on the object of being cooled, and also accompany soft metal indium sheet 11 between the two.
Claims (7)
1. one kind is adopted the high vacuum cryostat that hangs down the heat leak flexible connecting structure, it is characterized in that it has refrigeration machine mounting flange (2), refrigeration machine mounting flange (2) outside is fixing with outer wall (15) the employing bolt arrangement (17) of thermostat upper end, the inboard outer wall (15) with the thermostat upper end of refrigeration machine mounting flange (2) adopts bellows (16) welding fixing, in the thermostat, be provided with vacuum jacket (3), last heat sink (4), flexible thermal syndeton (5), following heat sink (6) under the refrigeration machine mounting flange (2) successively.
2. a kind of high vacuum cryostat that adopts low heat leak flexible connecting structure according to claim 1 is characterized in that said vacuum jacket (3) adopts corrugated stainless steel tubing (3b).
3. a kind of high vacuum cryostat that adopts low heat leak flexible connecting structure according to claim 1 is characterized in that said vacuum jacket (3) adopts stainless steel folded tube (3c).
4. a kind of high vacuum cryostat that adopts low heat leak flexible connecting structure according to claim 1 is characterized in that said flexible thermal syndeton (5) adopts flexible oxygen-free copper establishment band (10).
5. a kind of high vacuum cryostat that adopts low heat leak flexible connecting structure according to claim 1 is characterized in that said heat sink (4) and following heat sink (6) are provided with exit passageway (12).
6. a kind of high vacuum cryostat that adopts low heat leak flexible connecting structure according to claim 1 is characterized in that said heat sink (4) inboard of is provided with soft metal indium sheet (8).
7. a kind of high vacuum cryostat that adopts low heat leak flexible connecting structure according to claim 1 is characterized in that said heat sink (6) lower end down is provided with soft metal indium sheet (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410053602XA CN1304810C (en) | 2004-08-05 | 2004-08-05 | High vacuum low temperature thermostat using low temperature leak flexible connecting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410053602XA CN1304810C (en) | 2004-08-05 | 2004-08-05 | High vacuum low temperature thermostat using low temperature leak flexible connecting structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1587886A CN1587886A (en) | 2005-03-02 |
| CN1304810C true CN1304810C (en) | 2007-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410053602XA Expired - Fee Related CN1304810C (en) | 2004-08-05 | 2004-08-05 | High vacuum low temperature thermostat using low temperature leak flexible connecting structure |
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| CN (1) | CN1304810C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2440350B (en) * | 2006-07-25 | 2009-10-14 | Siemens Magnet Technology Ltd | A cryostat comprising a cryogen vessel suspended within an outer vacuum container |
| US20080026181A1 (en) * | 2006-07-25 | 2008-01-31 | Ravi Rastogi | Synergistically-modified surfaces and surface profiles for use with thermal interconnect and interface materials, methods of production and uses thereof |
| CN107664678B (en) * | 2017-09-12 | 2019-12-13 | 北京大学 | Low-vibration ultrahigh-vacuum low-temperature physical property measuring device |
| CN108380248B (en) * | 2018-03-02 | 2020-12-01 | 中科院南京天文仪器有限公司 | Temperature separation device for cryogenic vacuum environment simulation system |
| JP7068032B2 (en) * | 2018-05-17 | 2022-05-16 | 株式会社東芝 | Very low temperature cooling device |
| CN112834668B (en) * | 2020-12-30 | 2022-08-19 | 中国原子能科学研究院 | Low-temperature control device for analyzing hydrogen isotopes by gas chromatography |
| CN115289716A (en) * | 2022-06-09 | 2022-11-04 | 北京交通大学 | Cold plugging device of bipolar cold head refrigerator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4777807A (en) * | 1986-09-09 | 1988-10-18 | Oxford Magnet Technology Limited | Cryostat assembly |
| US5129232A (en) * | 1991-06-03 | 1992-07-14 | General Electric Company | Vibration isolation of superconducting magnets |
| CN2733299Y (en) * | 2004-08-05 | 2005-10-12 | 浙江大学 | High vacuum cryostat by employing low heat-leakage flexible connection structure |
-
2004
- 2004-08-05 CN CNB200410053602XA patent/CN1304810C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4777807A (en) * | 1986-09-09 | 1988-10-18 | Oxford Magnet Technology Limited | Cryostat assembly |
| US5129232A (en) * | 1991-06-03 | 1992-07-14 | General Electric Company | Vibration isolation of superconducting magnets |
| CN2733299Y (en) * | 2004-08-05 | 2005-10-12 | 浙江大学 | High vacuum cryostat by employing low heat-leakage flexible connection structure |
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| Publication number | Publication date |
|---|---|
| CN1587886A (en) | 2005-03-02 |
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