Multi-stage cryogenic refrigerator
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United States of America Patent
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May 19, 1992
Grant Date -
N/A
app pub date -
Mar 11, 1991
filing date -
Mar 11, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multi-stage cryogenic refrigerator utilizing the Gifford-McMahon cycle has an external regenerator in each stage. The external regenerators are vertically stacked and connected in series, so that expanding gas is allowed to flow through the regenerators without significant obstruction or turning motion. The lower regenerators operate at progressively lower temperatures. The packing material within each regenerator has a higher specific heat than that of the regenerator immediately above as determined at the operating temperature of the regenerator.
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