Gas balanced brayton cycle cold water vapor cryopump
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United States of America Patent
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Jan 17, 2017
Grant Date -
Jan 10, 2013
app pub date -
Jun 6, 2012
filing date -
Jul 6, 2011
priority date (Note) -
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Abstract
The primary invention is to cool a water vapor cryopump using a Gas Balanced Brayton cycle refrigerator. The refrigerator is comprised of a compressor, a gas balanced reciprocating engine and a counterflow heat exchanger. It is connected to the cryopump through insulated transfer lines. Options include a gas storage volume with valves that can adjust system pressures, a variable speed engine, gas lines between the compressor and cryopanel that by-pass the engine, and a gas line that by-passes the heat exchanger. This system can cool down and warm up rapidly, rapidly warm and cool the cryopanel without warming the engine, and reduce power input when the cryopanel heat load is reduced.
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