Gas balanced cryogenic expansion engine
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United States of America Patent
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Feb 28, 2017
Grant Date -
Oct 2, 2014
app pub date -
Jun 13, 2014
filing date -
May 12, 2011
priority date (Note) -
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Abstract
An expansion engine operating on a Brayton cycle which is part of a system for producing refrigeration at cryogenic temperatures that includes a compressor, a counter-flow heat exchanger, and a load that may be remote, which is cooled by gas circulating from the engine. The engine has a piston in a cylinder which has nearly the same pressure above and below the piston while it is moving. Low pressure on a piston drive stem provides a force imbalance to move the piston towards the warm end.
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