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

1989-11-01

1992-03-03

Capossela, Ronald C.

Refrigeration

Gas compression, heat regeneration and expansion, e.g.,...

165 4, F25B 900

Patent

active

050921304

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 on 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
Advances in Cryogenic Engineering vol. 15 (Jun. 1969) pp. 428-435 R. W. Staurt and B. M. Cohen.
Cryogenics May, 1975, pp. 261-264, "Extremely Large Heat Capacities Between 4 and 10 K", K. H. Buschow, et al.

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