VACUUM PUMP HAVING EXPANSION CHAMBER AND METHOD OF ACHIEVING ULTIMATE PRESSURE STATE IN A VACUUM PUMP USING AN EXPANSION CHAMBER
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United States of America Patent
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Issued Date -
Oct 30, 2014
app pub date -
Apr 30, 2013
filing date -
Apr 30, 2013
priority date (Note) -
Abandoned
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Abstract
A vacuum pump and a method of controlling the operation of the vacuum pump employ an expansion chamber to reduce a pressure differential between an inlet side and an exhaust side of the pump. In particular, the expansion chamber may be used to rid the pump head of the pump of a pocket of relatively high pressure fluid that accumulates behind a poppet valve disposed over an exhaust opening. The pump itself may be used to create a level of vacuum pressure in the expansion chamber. Alternatively, a piston or diaphragm may be used. In either case, the expansion chamber is isolated from the ambient and interior of the pump head once a level of vacuum pressure is produced in the expansion chamber. Then the exhaust outlet is redirected from the ambient to the interior of the expansion chamber.
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