CN101487652B - Ultra-silent liquid helium thermostat - Google Patents
Ultra-silent liquid helium thermostat Download PDFInfo
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- CN101487652B CN101487652B CN2009101161743A CN200910116174A CN101487652B CN 101487652 B CN101487652 B CN 101487652B CN 2009101161743 A CN2009101161743 A CN 2009101161743A CN 200910116174 A CN200910116174 A CN 200910116174A CN 101487652 B CN101487652 B CN 101487652B
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- inner bag
- helium
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- liquid helium
- inner container
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Abstract
The invention discloses an extra-static liquid helium thermostat and relates to a liquid helium thermostat. The thermostat comprises a shell, an inner container, a bottle neck, a gas exhaust and inflation pipe, a helium outlet pipe and a cold shield, wherein, the inner container is arranged inside the shell; one end of the bottle neck extends to the bottom of the inner container from the top of the inner container and is sealed and connected with the bottom of the inner container; the other end of the bottle neck is communicated with the outer part of the shell by the top of the shell; the inside of the bottle neck is communicated with the outer part of the shell by the gas exhaust and inflation pipe; the cold shield is arranged between the inner container and the shell and covers the inner container; the helium outlet pipe is wound around the cold shield; the two ends of the helium outlet pipe communicate the inside of the inner container with the outside of the shell; vacuum is formed between the outside of the inner container and the inner surface of the shell; an auxiliary helium outlet pipe can be added and wound on the bottle neck; the two ends of the auxiliary helium outlet pipe can communicate the inside of the inner container with the outside of the shell; and the bottle neck can be made of a corrugated pipe. The bottle neck extends to the bottom from the top of the inner container and is sealed and connected with the bottom, so as to obtain a lower temperature cavity body separated from the liquid helium, and avoid the shock caused by the collision of the boiling of the liquid helium with the experimental facilities in the bottle neck. Two helium outlet pipes are utilized to cool the cold shield and the bottle neck, so as to reduce helium evaporativity.
Description
Technical field
The present invention relates to liquid helium thermostat, particularly a kind of scientific research ultra-silent liquid helium thermostat with ultralow vibrations belongs to the cryostat technical field.
Background technology
The scientific research liquid helium thermostat is a kind ofly can the low temperature cold environment is provided and shield ambient temperature, air and the steam low-temperature (low temperature) vessel of influence to experiment to experimental provision, has been widely used in the research and the field tests of thermophysical property, material mechanical performance, magnetomechanics performance, material superconductivity, optical physics performance and biological medicine development etc. under low temperature environment.
There is following shortcoming in existing scientific research with liquid helium thermostat: experimental provision directly was immersed in the liquid helium in the inner bag when used (1), the boiling of liquid helium produces than big bang experimental provision, all be the obstacle that low temperature scanning probe microscope is made all the time, because of the imaging vibrations to external world of its atomic level very responsive; Go for the atom resolution image of high-resolution, the various vibrations that must as far as possible go to reduce to come from the outside are disturbed.(2) but use the alternating temperature plug-in unit can isolate liquid helium and experimental provision, but but the alternating temperature plug-in unit has also occupied bigger low temperature space, make the volume of experimental provision have to reduce, otherwise can't be implanted in the very limited extreme condition in space, in the less kicker magnet of internal orifice dimension; But the price of alternating temperature plug-in unit is also relatively more expensive in addition.
Summary of the invention
In order to solve existing scientific research, produce liquid helium thermostat with ultralow vibrations with the big defective of the existing vibrations of liquid helium thermostat.
The present invention realizes that the technical scheme of ultra-silent liquid helium thermostat is:
Ultra-silent liquid helium thermostat of the present invention, comprise shell, inner bag, bottleneck, helium escape pipe and cold screen, it is characterized in that also comprising and take out gas tube, inner bag places enclosure, one end of described bottleneck stretches to inner bag bottom and sealing-in bottom inner bag from the inner bag top, the other end communicates with housing exterior from cover top portion, the described gas tube of taking out is communicated with bottleneck inside and housing exterior, described cold screen places between inner bag and the shell and covers inner bag, described helium escape pipe coils on cold screen, 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.
Ultra-silent liquid helium thermostat of the present invention, its feature also is:
Set up auxiliary helium escape pipe, coil on bottleneck, its two ends are communicated with inner bag inside and housing exterior.
Set up the helium liquid injection pipe between described inner bag top and the cover top portion.
Described helium escape pipe has been set up the gas flow rate control valve at the port of housing exterior.
Described auxiliary 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 ultra-silent liquid helium thermostat of the present invention is:
One end of bottleneck stretches to inner bag bottom and sealing-in bottom inner bag from the inner bag top, in the liquid helium bath of inner bag, isolate a low temperature and do not have the liquid helium cavity, place experimental provision in this cavity can avoid seething with excitement vibration problems that the collision of liquid helium brings, in bottleneck, import a small amount of helium by the gas tube of taking out that is communicated with bottleneck and housing exterior as heat-exchange gas, can be preferably to being in the experimental provision cooling of bottleneck bottom.
The cold helium that evaporates in the inner bag can be drawn by two helium escape pipes, but not draws as traditional single tube, and the helium escape pipe that wherein is coiled on the cold screen is used for cooling off cold screen, and the auxiliary helium escape pipe that is coiled on the bottleneck is used for cooling off bottleneck.Because cold screen and bottleneck all are by special-purpose helium escape pipe cooling, but not as tradition cool off cold screen and bottleneck with single helium escape pipe series connection, so cold screen and bottleneck have all obtained cooling off preferably among the present invention.Described helium escape pipe and/or auxiliary helium escape pipe all can be set up the gas flow rate control valve in the exit, control the flow velocity of cold steam in its pipe, thereby can be from experimentally adjusting optimized cold steam flow speed ratio, this leaks problem hot and conductive heat leakage with regard to having solved the radiation that can not take into account simultaneously that exists in the cold screen technology of existing liquid helium thermostat, realizes lower liquid helium loss.Also avoided complexity and the low self-consistency of reliability required in the conventional art to calculate.
According to above-mentioned principle as can be seen, compared with the prior art, beneficial effect of the present invention is embodied in:
(1) end of bottleneck stretch to from the inner bag top inner bag bottom and with inner bag bottom sealing-in, the vibration problems of having avoided the boiling of liquid helium that experimental provision collision in the bottleneck is brought; In bottleneck, import a small amount of helium by the gas tube of taking out that is communicated with bottleneck and housing exterior, can lower the temperature better the experimental provision that is in the bottleneck bottom as heat-exchange gas.
(2) use two helium escape pipes, can take into account the cooling of cold screen and the cooling of bottleneck, thereby reduce the helium evaporation rate.
(3) 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.
(4) being in the inner bag top and can making of bellows to the part between the cover top portion of bottleneck can increase the effective length of bottleneck conductive heat leakage, further reduces the conductive heat leakage from bottleneck.
Description of drawings
Fig. 1 is with basic model ultra-silent liquid helium thermostat structural representation of the present invention.
Fig. 2 is the ultra-silent liquid helium thermostat structural representation with double-coil pipe cold steam refrigerating of the present invention.
Fig. 3 is to be the ultra-silent liquid helium thermostat 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 are taken out gas tube, 5 helium escape pipes, 6 cold screens, 7 auxiliary helium escape pipes, 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 basic model ultra-silent liquid helium thermostat
Referring to Fig. 1, basic model ultra-silent liquid helium thermostat of the present invention, comprise shell 1, inner bag 2, bottleneck 3, helium escape pipe 5 and cold screen 6, it is characterized in that also comprising and take out gas tube 4, inner bag 2 places shell 1 inside, one end of described bottleneck 3 stretch to from inner bag 2 tops inner bag 2 bottoms and with inner bag 2 bottom sealing-ins, the other end is from shell 1 top and shell 1 exterior, the described gas tube 4 of taking out is communicated with bottleneck 3 inner and shell 1 outsides, described cold screen 6 places between inner bag 2 and the shell 1 and covers inner bag 2, described helium escape pipe 5 coils on 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:
One end of bottleneck 3 stretch to from inner bag 2 tops inner bag 2 bottoms and with inner bag 2 bottom sealing-ins, in the liquid helium bath of inner bag 2, isolate a low temperature and do not have the liquid helium cavity, the liquid helium that places the experimental provision in this cavity can avoid seething with excitement collides the vibration problems of bringing, in bottleneck 3, import a small amount of helium and carry out heat exchange by being communicated with the inner gas tube 4 of taking out of bottleneck 3, thereby the experimental provision in this isolated chambers is lowered the temperature preferably with shell 1 outside.
Described cold screen 6 places between inner bag 2 and the shell 1, and described helium escape pipe 5 coils on cold screen 6, and its two ends are communicated with inner bag 2 inner and shell 1 outsides, reduces the radiation leakage heat of shell 1 to inner bag 2 thereby utilize the cold steam of helium to cool off cold screen 6 with this.
Embodiment 2: the ultra-silent liquid helium thermostat of double-coil pipe cold steam refrigerating
In the foregoing description 1, leak heat and leak hot in order to take into account radiation simultaneously from the solid conduction of bottleneck 3, setting up one coils on bottleneck 3, two ends are communicated with the auxiliary helium escape pipe 7 of inner bag 2 and shell 1 outside, 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, referring to Fig. 2.Also can set up the gas flow rate control valve in the port of housing exterior at helium escape pipe 5 and/or auxiliary helium escape pipe 7, the relative velocity of cold steam in control helium escape pipe 5 and the auxiliary helium escape pipe 7, thereby obtain optimized cold steam flow speed ratio, realize lower liquid helium loss, thereby can reduce the vibrations that produce owing to the liquid helium boiling largely.
Embodiment 3: bottleneck is the ultra-silent liquid helium thermostat 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 can use wall thickness thinner from inner bag 2 to shell, the bellows that heat conduction effective length is longer replaces, referring to Fig. 3.
Claims (5)
1. ultra-silent liquid helium thermostat, comprise shell, inner bag, bottleneck, helium escape pipe and cold screen, it is characterized in that also comprising and take out gas tube, inner bag places enclosure, one end of described bottleneck stretches to inner bag bottom and sealing-in bottom inner bag from the inner bag top, the other end communicates with housing exterior from cover top portion, the described gas tube of taking out is communicated with bottleneck inside and housing exterior, described cold screen places between inner bag and the shell and covers inner bag, described helium escape pipe coils on cold screen, 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. ultra-silent liquid helium thermostat according to claim 1 is characterized in that setting up between described inner bag top and the cover top portion helium liquid injection pipe.
3. ultra-silent liquid helium thermostat according to claim 1 is characterized in that described helium escape pipe set up the gas flow rate control valve at the port of housing exterior.
4. according to claim 1 or 2 or 3 described ultra-silent liquid helium thermostats, 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.
5. according to claim 1 or 2 or 3 described ultra-silent liquid helium thermostats, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101161743A CN101487652B (en) | 2009-02-09 | 2009-02-09 | Ultra-silent liquid helium thermostat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101161743A CN101487652B (en) | 2009-02-09 | 2009-02-09 | Ultra-silent liquid helium thermostat |
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| Publication Number | Publication Date |
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| CN101487652A CN101487652A (en) | 2009-07-22 |
| CN101487652B true CN101487652B (en) | 2011-01-05 |
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| CN2009101161743A Expired - Fee Related CN101487652B (en) | 2009-02-09 | 2009-02-09 | Ultra-silent liquid helium thermostat |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101856630B (en) * | 2010-06-10 | 2011-11-16 | 上海交通大学 | Superfluidhelium constant temperature bath device |
| US9528749B2 (en) | 2011-11-02 | 2016-12-27 | Lg Electronics Inc. | Refrigerator |
| KR101832763B1 (en) | 2011-11-02 | 2018-02-28 | 엘지전자 주식회사 | A refrigerator comprising a vacuum space |
| KR101861831B1 (en) * | 2011-11-02 | 2018-05-29 | 엘지전자 주식회사 | A refrigerator comprising a vacuum space |
| KR101861832B1 (en) | 2011-11-04 | 2018-05-29 | 엘지전자 주식회사 | A refrigerator comprising a vacuum space |
| CN106768615B (en) * | 2015-11-23 | 2019-08-09 | 北京航天试验技术研究所 | A kind of low temperature warm area High Accuracy Constant Temperature test cavity |
| CN107560958A (en) * | 2017-09-25 | 2018-01-09 | 清华大学 | The ultralow vibration friction testing arrangement of ultralow temperature |
| CN113267527B (en) * | 2021-05-19 | 2023-05-30 | 天津大学 | Experimental device for can be used to carry out steady state pool boiling under different saturation pressures |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD258540A3 (en) * | 1984-07-25 | 1988-07-27 | Ftint | CRYOSTATS |
| US5586437A (en) * | 1995-09-06 | 1996-12-24 | Intermagnetics General Corporation | MRI cryostat cooled by open and closed cycle refrigeration systems |
| CN1589486A (en) * | 2001-11-21 | 2005-03-02 | 牛津磁体技术有限公司 | Cryogenic assembly |
-
2009
- 2009-02-09 CN CN2009101161743A patent/CN101487652B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD258540A3 (en) * | 1984-07-25 | 1988-07-27 | Ftint | CRYOSTATS |
| US5586437A (en) * | 1995-09-06 | 1996-12-24 | Intermagnetics General Corporation | MRI cryostat cooled by open and closed cycle refrigeration systems |
| CN1589486A (en) * | 2001-11-21 | 2005-03-02 | 牛津磁体技术有限公司 | Cryogenic assembly |
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| CN101487652A (en) | 2009-07-22 |
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