Centrifugal fan
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Dec 27, 2011
Grant Date -
Feb 18, 2010
app pub date -
Dec 5, 2008
filing date -
Aug 13, 2008
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A centrifugal fan includes a plurality of blades, a casing and a tongue. The casing includes a base plate perpendicular to a rotation axis of the blades and a sidewall extending upwardly from the base plate. The base plate and the sidewall cooperatively define a space for receiving the blades therein. The sidewall defines an opening in one side for functioning as an air outlet. An air channel is defined between outmost ends of the blades and the sidewall. The tongue is detachably mounted to one end of the sidewall adjacent to the air outlet. The tongue includes a guiding surface protruding towards the outmost ends of the blades. The tongues is provided for lowering a noise level of the centrifugal fan during operation.
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