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Cryogenic refrigerator
| Details |
Inventors: Nagao, Masashi;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Kilner; Christopher
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
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. |
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DETAILED DESCRIPTION This invention has been made with a view toward solving the above problems.
It is an object of this invention to provide a cryogenic refrigerator which prevents a deterioration in refrigeration performance and which provides highly efficient and reliable refrigerating at low cost.
In order to achieve the above object, according to a first aspect of the present invention, there is provided 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 introduced thereto from an expansion space of the first expander; and a second compressor which compresses the working fluid.
According to a second aspect of the present invention, the second expander of the cryogenic refrigerator includes a displacement-type expander body, an inlet valve, an outlet valve, and a power absorption mechanism.
According to a third aspect of the present invention, the second expander of the cryogenic refrigerator includes a Simon-expansion-type expander body, an inlet valve, and an outlet valve.
According to a fourth aspect of the present invention, the second expander of the cryogenic refrigerator comprises a throttle section.
According to a fifth aspect of the present invention, a control valve is provided on the outlet side of an expansion space of the first expander, and a buffer tank for temporarily storing the working fluid is provided between this control valve and the second expander.
According to a sixth aspect of the present invention, the cryogenic refrigerator has at least one heat exchanger which performs heat exchange between the working fluid returning from the second expander and the working fluid in the first expander.
Further, according to a seventh aspect of the present invention, the cryogenic refrigerator further comprises at least one throttle section capable of generating a controlled leakage, and at least one heat exchange section for effecting heat exchange between the working fluid passing through this throttle section and the working fluid returning from the second expander
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