Cryogenic refrigerator

U.S. Patent Number: 5387252

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.

Inventors: Nagao; Masashi (Amagasaki, JP)

Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)

Application Number: 08/039,816

Issued: 1995-02-07

Expired: 2007-02-07

Classes: 62/6 ; 62/196.2

Field of search: 62/6,196.2,228.5,47.1

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