Centrifugal blower fan
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United States of America Patent
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Aug 8, 2006
Grant Date -
Dec 2, 2004
app pub date -
Apr 22, 2004
filing date -
Apr 25, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
It is the object of the present invention to provide a centrifugal blower fan capable of reducing a noise in an operating rotational speed range without degradation in blawer performance. A centrifugal blower fan comprises a base plate, and a plurality of fan blades arranged on the base plate in a radial pattern to define a plurality of air passages between the pairs of adjacent fan blades, respectively. A portion of the base plate serving as a bottom wall of each of the air passages is formed with a plurality of through-holes.
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