Noise control device for centrifugal blower
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United States of America Patent
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May 24, 1994
Grant Date -
N/A
app pub date -
Jan 13, 1992
filing date -
Jan 13, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A noise cancellation device for a centrifugal blower comprises 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 outlet. The rod is positioned a specified distance away 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.
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