F - Mech Eng,Light,Heat,Weapons – 04 – D
Patent
F - Mech Eng,Light,Heat,Weapons
04
D
F04D 17/04 (2006.01) F04D 29/66 (2006.01)
Patent
CA 2127793
2127793 9314320 PCTABS00024 A noise cancellation device for a centrifugal blower comprises, in a first embodiment, a rod (36) mounted in the output of a blower (30) and generally axially parallel to the impeller (24) so that as the impeller rotates, the blades (26) of the impeller sweep past the rod much as in the same manner that the blades sweep past the cutoff section (34) of the blower output. The rod (36) is positioned at a specified distance away from the cutoff such that it generates a tone which interferes with the pure tone otherwise generated by the impeller blades (26) sweeping past the cutoff in an out-of-phase condition to eliminate the pure tone or spike normally experienced at a fundamental frequency. In a second embodiment, a nose-like projection (38) extends inwardly from a sidewall of the blower housing and is positioned substantially in the same position as the rod of the first embodiment. The nose-like projection may be integrally formed as part of the blower housing.
Garrison Bobby Doyle
Gatley William Stuart Jr.
Fasco Industries Inc.
Smart & Biggar
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