Noise cancellation device for centrifugal blower

Details Noise cancellation device for centrifugal blower Noise cancellation device for centrifugal blower

1993-08-24

1994-05-31

Look, Edward K.

Rotary kinetic fluid motors or pumps

With sound or vibratory wave absorbing or preventing means...

F04D 1704

Patent

active

053164393

ABSTRACT:
A noise cancellation device for a centrifugal blower comprises, in a first embodiment, a rod mounted in the output of a blower and generally axially parallel to the impeller so that as the impeller rotates, the blades of the impeller sweep past the rod much as in the manner that the blades sweep past the cutoff section of the blower output. The rod is positioned 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 sweeping past the cutoff in an out of phase condition to thereby eliminate the pure tone or "spike" normally experienced at a fundamental frequency and harmonics thereof. In a second embodiment, a nose-like projection extends inwardly from a sidewall of said 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.

REFERENCES:
patent: 353994 (1886-12-01), Walker et al.
patent: 2107897 (1938-02-01), McMahan
patent: 2109742 (1938-03-01), Fanning
patent: 2171342 (1939-08-01), McMahan
patent: 3477635 (1969-11-01), Glucksman et al.
patent: 4078870 (1978-03-01), Keller et al.
patent: 4419049 (1983-12-01), Gerboth et al.

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