Refrigeration – Gas compression – heat regeneration and expansion – e.g.,...
Patent
1998-08-21
1999-12-21
Doerrler, William
Refrigeration
Gas compression, heat regeneration and expansion, e.g.,...
165 4, 60520, C09K 500, F25B 900, F28D 2000
Patent
active
060033207
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a cold accumulating material for extremely low temperature cold for use in refrigerators or the like, a refrigerator using the same and an extremely low temperature heat shielding member, and more particularly to a cold accumulating material for extremely low temperature cold in which a pressure loss of refrigerant is so small that a refrigerating performance thereof can be exerted sufficiently and which is easy to process to a configuration reducing the pressure loss, a refrigerator using the same and an extremely low temperature heat shielding member.
BACKGROUND ART
Recently, superconductivity technology has been progressed remarkably and with an expanding application field thereof, development of a small, high performance refrigerator has become indispensable. For such a refrigerator, light weight, small size and high heat efficiency are demanded.
For example in a superconductive MRI apparatus, cryopump and the like, a refrigerator based on such refrigerating cycle as Gifford MacMahon type (GM refrigerator), Starling method has been used. Further, a magnetic floating train absolutely needs a high performance refrigerator. Further, in recent years, a superconductive power storage apparatus (SMES) or a in-magnetic field single crystal pull-up apparatus has been provided with a high performance refrigerator as a main component thereof. Further, to stabilize the temperature of a component material operating under ultra-low temperatures such as a superconductive wire, superconductive device, infrared ray sensor, the cold accumulating material for extremely low temperature cold for a thermal anchor, heat sink and heat shielding has been widely used.
FIG. 9 is a sectional view showing a main structure of a conventional two-staged GM refrigerator. This GM refrigerator 10 has a vacuum container 13 containing a first cylinder 11 having a large diameter and a second cylinder 12 connected coaxially to the first cylinder 11. The first cylinder 11 contains a first cold accumulating unit 14 which is freely reciprocatable and the second cylinder 12 also contains a second cold accumulating unit 15 which is freely reciprocatable. Seal rings 16, 17 are disposed between the first cylinder 11 and first cold accumulating unit 14, and between the second cylinder 12 and second cold accumulating unit 15 respectively.
The first cold accumulating unit 14 accommodates a first cold accumulating material 18 made of Cu mesh or the like. The second cold accumulating unit 15 contains a second cold accumulating material 19 made of a cold accumulating material for extremely low temperature cold. The first cold accumulating unit 14 and second cold accumulating unit 15 have operating medium (refrigerant) paths for He gas or the like which are provided in gaps of the first cold accumulating material 18 and cold accumulating material for extremely low temperature cold 19.
A first expansion chamber 20 is provided between the first cold accumulating unit 14 and second cold accumulating unit 15. A second expansion chamber 21 is provided between the second cold accumulating unit 15 and an end wall of the second cylinder 12. A first cooling stage 22 is provided on a bottom of the first expansion chamber 20 and further a second cooling stage 23 which is colder than the first cooling stage 22 is provided on a bottom of the second expansion chamber 21.
A high pressure operating medium (e.g., He gas) is supplied from a compressor 24 to the aforementioned two-staged GM refrigerator 10. The supplied operating medium passes through the first cold accumulating material 18 accommodated in the first cold accumulating unit 14 and reaches the first expansion chamber 20, and further passes through the second cold accumulating material (second cold accumulating material) 19 accommodated in the second cold accumulating unit 15 and reaches the second expansion chamber 21. At this time, the operating medium supplies heat energy to the respective first cold accumulating materials 18, 19 so that they are c
REFERENCES:
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patent: 5186765 (1993-02-01), Arai et al.
patent: 5224657 (1993-07-01), Kuriyama et al.
patent: 5298337 (1994-03-01), Hendricks et al.
patent: 5332029 (1994-07-01), Tokai et al.
Arai Tomohisa
Chandrtilleke Rohana
Hashimoto Keisuke
Nakagome Hideki
Okamura Masami
Doerrler William
Kabushiki Kaisha Toshiba
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