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US 9,322,271 B2Granted
Cryogenic refrigerator
AssigneeSumitomo Heavy Industries, Ltd.
InventorKoji Yamada
Life of this patent
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Abstract
A disclosed cryogenic refrigerator includes a cylinder, a displacer reciprocally moving inside the cylinder, and an elastic unit which is provided in at least one of a pair of end regions respectively including a pair of end portions within a range of a reciprocal motion of the displacer, accumulates an elastic force when the displacer approaches the end portion, and releases the elastic force when the displacer departs from the end portion.
Claims9
A cryogenic refrigerator comprising:
- a compressor compressing a refrigerant gas;
- a displacer reciprocally moving between an upper dead end and a lower dead end, and containing a regenerative material;
- a cylinder containing the reciprocally moving displacer;
- a scotch yoke mechanism causing the displacer to reciprocate based on rotation of a motor:
- a rotary valve selectively connecting the cylinder to a supply side or a discharge side of the compressor;
- and
- an elastic unit which accumulates a force by the refrigerant gas acting on the displacer as an elastic force when the displacer approaches the upper dead end or the lower dead end, and which releases the accumulated elastic force as a force which cancels a force by the refrigerant gas acting on the displacer when the displacer departs from the upper dead end or the lower dead end.
4 more elements
Dependencies are inferred from the claim text.