CN201497669U - Cooling device based on G-M refrigerator - Google Patents
Cooling device based on G-M refrigerator Download PDFInfo
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- CN201497669U CN201497669U CN2009203095830U CN200920309583U CN201497669U CN 201497669 U CN201497669 U CN 201497669U CN 2009203095830 U CN2009203095830 U CN 2009203095830U CN 200920309583 U CN200920309583 U CN 200920309583U CN 201497669 U CN201497669 U CN 201497669U
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- refrigeration machine
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Abstract
The utility model relates to a cooling device based on a G-M refrigerator, which belongs to refrigerating equipment. The utility model solves the problem of high experiment cost caused by liquid helium use of the existing cooling device. The utility model is characterized in that a solenoid heat exchanger is sheathed on the outer surface of a primary cooling head and a second cooling head of the G-M refrigerator, the second cooling head of the G-M refrigerator is in contact with a helium condenser, the end of the solenoid heat exchanger is communicated with one end of the helium condenser, a radiation protective screen is sheathed outside the solenoid heat exchanger and the helium condenser, a cold trap is arranged on the radiation protective screen, one end of the cold trap passes through the radiation protective screen to be communicated with the solenoid heat exchanger, a vacuum cover is sheathed outside the radiation protective screen and the cold trap, a sample chamber is fixed in the vacuum cover, the other end of the helium condenser is communicated with the sample chamber through a liquid helium pipe, the other end of the cold trap is communicated with an external helium source, and the sample chamber is communicated with a sample placing valve fixed outside the vacuum cover. The utility model uses the G-M refrigerator as a cold source, and realizes the effect of cooling samples to the liquid helium temperature through the gasification phase change of the condensed liquid helium generated in the sample chamber.
Description
Technical field
The utility model belongs to the refrigeration plant in the cryogenic engineering, is specifically related to the device of a kind of G-M of utilization refrigeration machine by helium cooling sample.
Background technology
The G-M refrigeration cycle is by Ji Fute (Gifford) and the common invention of McMahon (Mcmahon), and its principle is to utilize adiabatic gas venting refrigeration.G-M type refrigeration machine has been widely used in cryopump and the various small-sized superconducting magnets of cooling at present, and see Chen Dengke, Sun Zhongzhang: " performance of GM205 refrigeration machine and the use on cryopump thereof " is published in 1991 03 phases of " vacuum and low temperature " magazine; And thunder cloud tints: " application of GM refrigeration machine in the magnetic resonance imaging cryostat " is published in 1996 01 phases of " cryogenic engineering " magazine.In cooling cryopump pump head and small-sized superconducting magnet etc. are used, generally use the direct contact of refrigeration machine cold head or use the material of high thermal conductivity to realize cooling effect as heat bridge.
Laboratory sample cooling device in the impulse magnetic field scientific experiment adopts liquid helium cooling usually, but because liquid helium costs an arm and a leg, makes that the scientific experiment expense is high under the impulse magnetic field; And the operating cost of GM refrigeration machine is low, and can be cooled to liquid helium temperature, if therefore the GM refrigeration machine can be applied in the scientific experiment under the impulse magnetic field, will reduce experimental expenses greatly.Under the experimental situation of impulse magnetic field, directly contact owing to infeasible on the structure, and the high thermal conductivity materials of making heat bridge all there is high conductivity, under the environment of impulse magnetic field, can produces eddy current, eddy current can cause the heat bridge heating, and therefore direct contact and heat bridge all can not be realized the cooling to sample.
Summary of the invention
The utility model provides a kind of cooling device based on the G-M refrigeration machine, solves existing laboratory sample cooling device and uses the high problem of experimental expenses that liquid helium caused, and uses the GM refrigeration machine to cool off sample by helium.
A kind of cooling device based on the G-M refrigeration machine of the present utility model comprises the G-M refrigeration machine, it is characterized in that:
Described G-M refrigeration machine one-level cold head and secondary cold head outside surface are with the solenoid heat interchanger, G-M refrigeration machine secondary cold head contacts with the helium condenser, solenoid heat interchanger end is communicated with an end of helium condenser, be with the protective shield of radiation that is fixed on the G-M refrigeration machine one-level cold head outside solenoid heat interchanger and the helium condenser, cold-trap is installed on the protective shield of radiation, and an end of cold-trap passes protective shield of radiation and is communicated with the solenoid heat interchanger;
Be with vacuum (-tight) housing outside protective shield of radiation and the cold-trap, vacuum (-tight) housing is fixed by the seal flange of flange and G-M refrigeration machine, and the vacuum (-tight) housing internal fixation has the sample chamber, and the helium condenser other end is communicated with by liquid helium pipe and the sample chamber of passing protective shield of radiation; The other end of cold-trap passes vacuum (-tight) housing and outside helium gas source is communicated with; The sample chamber is communicated with the sample that is fixed on outside the vacuum (-tight) housing by pipeline and places valve.
Described cooling device is characterized in that:
Described solenoid heat interchanger is made of the stainless-steel tube that is wrapped on G-M refrigeration machine one-level cold head and the secondary cold head outside surface.
The utility model utilizes the G-M refrigeration machine as low-temperature receiver, be connected with a protective shield of radiation on the G-M refrigeration machine one-level cold head, and a cold-trap is installed on protective shield of radiation, between the one-level cold head of G-M refrigeration machine and the secondary cold head solenoid heat interchanger is arranged, on the secondary cold head of G-M refrigeration machine the helium condenser is housed, the helium condenser is connected by the liquid helium pipe with the sample chamber, sample is placed on the bottom, sample chamber, one-level cold head, protective shield of radiation and sample chamber all are loaded in the vacuum (-tight) housing, and vacuum (-tight) housing provides vacuum insulation for other devices; Helium enters cold-trap by precooling from inlet duct, being entered the solenoid heat interchanger that is wrapped on the G-M refrigeration machine by the helium of precooling is then fully cooled off once more, the helium that is cooled enters the helium condenser condenses and becomes liquid helium, liquid helium flow in the sample chamber by the liquid helium pipe, the liquid helium gasification of being heated in the sample chamber, absorb heat, realize the purpose of cooling sample to liquid helium temperature.
The utility model directly utilizes the G-M refrigeration machine as low-temperature receiver, thereby the liquid helium by condensation has been realized the effect of cooling sample to liquid helium temperature in sample chamber generating gasification phase transformation, thereby has realized not using in the impulse magnetic field scientific experiment liquid helium also can reach the purpose of cooling sample to liquid helium temperature.
Description of drawings
Fig. 1 is the utility model structural representation.
Mark among the figure: G-M refrigeration machine 1, vacuum (-tight) housing 2, protective shield of radiation 3, solenoid heat interchanger 4, helium condenser 5, liquid helium pipe 6, sample chamber 7, sample 8, cold-trap 9, sample are placed valve 10, helium inlet 11, flange 12, seal flange 13.
Embodiment
Below in conjunction with accompanying drawing the utility model is further specified.
In the utility model: the one-level cold head of G-M refrigeration machine 1 and secondary cold head outside surface are with solenoid heat interchanger 4, G-M refrigeration machine secondary cold head contacts with helium condenser 5, solenoid heat interchanger 4 ends are communicated with an end of helium condenser 5, be with the protective shield of radiation 3 that is fixed on the G-M refrigeration machine one-level cold head outside solenoid heat interchanger 4 and the helium condenser 5, cold-trap 9 is installed on the protective shield of radiation 3, and an end of cold-trap 9 passes protective shield of radiation 3 and is communicated with solenoid heat interchanger 4; Be with vacuum (-tight) housing 2 outside protective shield of radiation 3 and the cold-trap 9, vacuum (-tight) housing 2 is fixing with the seal flange 13 of G-M refrigeration machine by flange 12, and vacuum (-tight) housing 2 internal fixation have sample chamber 7, and helium condenser 5 other ends are communicated with by liquid helium pipe 6 and the sample chamber 7 of passing protective shield of radiation 3; The other end of cold-trap 9 passes vacuum (-tight) housing 2 and outside helium gas source is communicated with; Sample chamber 7 is communicated with the samples that are fixed on outside the vacuum (-tight) housing 2 by pipeline and places valve 10.
The G-M refrigeration machine adopts 1.5 watts, 4K refrigeration machine, and cold-trap and helium condenser all use red copper processing, and protective shield of radiation adopts red copper processing and two-sided nickel plating, and vacuum (-tight) housing and sample chamber adopt stainless steel processing, sample to place valve can use straight-through valve.
Claims (2)
1. the cooling device based on the G-M refrigeration machine comprises the G-M refrigeration machine, it is characterized in that:
Described G-M refrigeration machine one-level cold head and secondary cold head outside surface are with the solenoid heat interchanger, G-M refrigeration machine secondary cold head contacts with the helium condenser, solenoid heat interchanger end is communicated with an end of helium condenser, be with the protective shield of radiation that is fixed on the G-M refrigeration machine one-level cold head outside solenoid heat interchanger and the helium condenser, cold-trap is installed on the protective shield of radiation, and an end of cold-trap passes protective shield of radiation and is communicated with the solenoid heat interchanger;
Be with vacuum (-tight) housing outside protective shield of radiation and the cold-trap, vacuum (-tight) housing is fixed by the seal flange of flange and G-M refrigeration machine, and the vacuum (-tight) housing internal fixation has the sample chamber, and the helium condenser other end is communicated with by liquid helium pipe and the sample chamber of passing protective shield of radiation; The other end of cold-trap passes vacuum (-tight) housing and outside helium gas source is communicated with; The sample chamber is communicated with the sample that is fixed on outside the vacuum (-tight) housing by pipeline and places valve.
2. cooling device as claimed in claim 1 is characterized in that:
Described solenoid heat interchanger is made of the stainless-steel tube that is wrapped on G-M refrigeration machine one-level cold head and the secondary cold head outside surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203095830U CN201497669U (en) | 2009-09-03 | 2009-09-03 | Cooling device based on G-M refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203095830U CN201497669U (en) | 2009-09-03 | 2009-09-03 | Cooling device based on G-M refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201497669U true CN201497669U (en) | 2010-06-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203095830U Expired - Fee Related CN201497669U (en) | 2009-09-03 | 2009-09-03 | Cooling device based on G-M refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201497669U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101655428B (en) * | 2009-09-03 | 2011-09-14 | 华中科技大学 | Cooling device based on G-M refrigerating machine |
| CN112414188A (en) * | 2020-11-10 | 2021-02-26 | 北京航空航天大学 | Condenser and low-temperature loop heat pipe |
-
2009
- 2009-09-03 CN CN2009203095830U patent/CN201497669U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101655428B (en) * | 2009-09-03 | 2011-09-14 | 华中科技大学 | Cooling device based on G-M refrigerating machine |
| CN112414188A (en) * | 2020-11-10 | 2021-02-26 | 北京航空航天大学 | Condenser and low-temperature loop heat pipe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100602 Termination date: 20170903 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |