Roots-type blower reduced acoustic signature method and apparatus
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United States of America Patent
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Aug 16, 2011
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app pub date -
Mar 18, 2008
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Dec 3, 2007
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Abstract
A Roots-type blower with helical cycloidal rotors features relief recesses in the chamber walls, isolated from the input and output ports. The relief recesses counter variation in leakback flow with angular position intrinsic to helical cycloidal rotors, attenuating a noise source.
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