Centrifugal fan

Details Centrifugal fan Centrifugal fan

2008-12-05

2011-12-27

Everhart, Caridad (Department: 2895)

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Casing having tangential inlet or outlet

C415S119000

Reexamination Certificate

active

08083477

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.

REFERENCES:
patent: 3695775 (1972-10-01), Zenkner
patent: 5108833 (1992-04-01), Noguchi et al.
patent: 5110258 (1992-05-01), Morinushi et al.
patent: 5997246 (1999-12-01), Humbad
patent: 6463230 (2002-10-01), Wargo
patent: 7210903 (2007-05-01), Lyons
patent: 2008/0107523 (2008-05-01), Chen et al.

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