Cryogenic refrigerator

Details Cryogenic refrigerator Cryogenic refrigerator

1993-03-30

1995-02-07

Tapolcai, William E.

Refrigeration

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

621962, F25B 900

Patent

active

053872525

ABSTRACT:
A cryogenic refrigerator which is capable of preventing a deterioration in refrigerating performance and which has high efficiency includes: a first compressor; a first expander having at least one accumulator using an accumulating material comprising of a rare earth alloy or compound which has a large specific weight at 10 K. or below or an accumulating material comprising of helium; a sub-expansion space which effects further expansion of a working fluid introduced thereto from an expansion space of the first expander; and a second compressor which compresses the working fluid returning from the sub-expansion space.

REFERENCES:
patent: 4766741 (1988-08-01), Bartlett et al.
patent: 4790147 (1988-12-01), Kuriyama et al.
patent: 4796443 (1989-01-01), Bartlett
patent: 5092130 (1992-03-01), Nagao et al.
patent: 5144805 (1992-09-01), Nagao et al.
patent: 5144810 (1992-09-01), Nagao et al.
patent: 5154063 (1992-10-01), Nagao et al.
Cryogenic Engineering Handbook, Sep. 15, 1982, p. 140.
45th Meeting on Cryogenics and Superconductivity, May 14-16, 1991, p. 197; "Effects of Cross-sectional Area of the Second-Stage Expansion Space of Two-Stage GM Refrigerator on Refrigeration Capacity".

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