Cryogenic refrigerator
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United States of America Patent
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Jun 14, 2016
Grant Date -
Oct 30, 2014
app pub date -
Feb 27, 2014
filing date -
Apr 24, 2013
priority date (Note) -
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Abstract
A cryogenic refrigerator includes a compressor having a return end and a suction end that selectively connects to an expansion space, a housing having an assist space that communicates to the return end, a cylinder having one end connected to the housing and another end connected to the expansion space, a displacer that undergoes a reciprocating motion inside the cylinder, and tolerates flow of a working gas to and from the expansion space, and a drive shaft that is accommodated within the housing and drives the displacer. The drive shaft includes first and second parts having different cross sectional areas, sealed and supported by first and second seals, respectively. An end of the first part opposes the housing to form the assist space, and an end of the second part connects to the displacer.
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