Cryogenic expander with collar bumper for reduced noise and vibration characteristics
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United States of America Patent
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Apr 28, 2020
Grant Date -
Jan 25, 2018
app pub date -
Jul 19, 2017
filing date -
Jul 25, 2016
priority date (Note) -
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Abstract
A cryogenic expander maximizes the energy absorbing capacity of bumpers that prevent the displacer or piston in a pneumatically driven expander from hitting the cold or warm end of a cylinder. A collar at the warm end of the piston which has the same outside diameter as the piston and a lip at the warm end that engages an “O” ring before the piston hits the cold end or bottom of the cylinder. The warm end of the collar also engages an “O” ring before the pistons hits the warm end or top of the cylinder. Having “O” rings that are near the maximum diameter of the cylinder maximizes the amount of energy they can absorb, and thus permits quiet operation of larger size expanders than prior designs.
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