VACUUM PUMP STATORS AND VACUUM PUMPS
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United States of America Patent
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N/A
Issued Date -
Apr 3, 2014
app pub date -
Mar 25, 2013
filing date -
Mar 26, 2012
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
Combined booster and primary pump arrangements can be bulky and require separate supplies of purge gas and cooling water. In order to overcome this problem invention provides a vacuum pump in which two or more pumping mechanisms, i.e. the booster pump and main pump, are housed in the same stator. The invention further provides a vacuum pump stator comprising at least two operatively interconnected cavities, wherein at least two of the cavities each comprise at least one rotor-receiving portion shaped to receive two or more at least partially intermeshing rotors, and wherein an axis of a rotor-receiving portion of a first one of the cavities is offset with respect to an axis of a rotor-receiving portion of a second one of the cavities.
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