Multi-stage cold accumulation type refrigerator and cooling devi

Details Multi-stage cold accumulation type refrigerator and cooling devi Multi-stage cold accumulation type refrigerator and cooling devi

1991-06-26

1992-09-08

Capossela, Ronald C.

Refrigeration

Refrigeration producer

With lubricant handling means

62511, 165 4, 505892, F17C 502

Patent

active

051448106

ABSTRACT:
In a multi-stage cold accumulation type refrigerator including a compressor disposed at an ordinary temperature, a helium gas as a common operating fluid to be compressed by the compressor, and one or more expansion chambers and cold accumulators of different temperature levels; a cold accumulating member of the cold accumulators is formed of an alloy or compound containing a rare earth metal, so that the efficiency of the refrigerator can be improved. Further, a heat generation quantity due to sliding resistance of a seal is set to be smaller than a theoretical generated refrigeration quantity to be obtained on the assumption of isothermal expansion in the expansion chambers, so that the refrigerating capacity can be improved. The refrigerator is applied to a cooling device for cooling a superconducting magnet, SQUID, superconducting computer, infrared telescope, etc.

REFERENCES:
patent: 3119236 (1964-01-01), Lutes
patent: 3375867 (1968-04-01), Daunt
patent: 4082138 (1978-04-01), Miedema et al.
patent: 4359872 (1982-11-01), Goldowsky
patent: 4689970 (1987-09-01), Ohguma et al.
German Patent Appln. P 39 36 914.5-42, Mitsubishi Denki K.K., ML 2285, Translation of the Office Action dated Jan. 28, 1991.
R. W. Stuart et al., Operation and Application of a Three-Stage Closed-Cycle Regenerative Refrigerator in the 6.5.degree. K. Region, K-3, pp. 428-435, Nov. 1989.
K. H. J. Buschow et al., Extremely Large Heat Capacities Between 4 and 10 K, Cryogenics, May 1975, pp. 261-264.

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