CENTRIFUGAL FAN AND NOISE REDUCTION METHOD IN CENTRIFUGAL FAN
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United States of America Patent
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Issued Date -
Jan 6, 2011
app pub date -
Apr 21, 2009
filing date -
Apr 22, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A centrifugal fan having a sound reduction effect for noises in a wide frequency range is provided. The centrifugal fan comprises a motor to which an impeller is connected, a casing which surrounds the impeller and which has a bell-mouth-like suction port, and a bell-mouth-like orifice which has a suction port being concentric with the suction port of the casing and having a diameter as large as that of the suction port of the casing, in an outer shell, providing a plurality of protrusions in a resonant space surrounded by the orifice, the casing, and the outer shell, and providing depressions which are formed so as to be interposed between the protrusions.
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