Roots-type blower reduced acoustic signature method and...

Details Roots-type blower reduced acoustic signature method and... Roots-type blower reduced acoustic signature method and...

2011-08-16

2011-08-16

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

Trapped fluid relief

C418S206100, C418S206400

Reexamination Certificate

active

07997885

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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