Cryogenic refrigerator
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorMasashi Nagao
Life of this patent
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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 a rare earth alloy or compound which has a large specific weight at 10K or below or an accumulating material comprising 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.
Claims12
A cryogenic refrigerator comprising:
- a first compressor;
- a first expander having at least one accumulator using an accumulating material comprising a rare earth alloy or compound which has a large specific heat at 10 K. or below or an accumulating material comprising helium;
- a second expander which effects further expansion of a working fluid partially and directly introduced thereto from an expansion space of the first expander;
- at least one heat exchanger which performs heat exchange between the working fluid expanded at said second expander and said first expander;
- and a second compressor which compresses the working fluid.
Dependencies are inferred from the claim text.