Centrifugal blower fan

Details Centrifugal blower fan Centrifugal blower fan

2006-08-08

2006-08-08

Nguyen, Ninh H. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Apertured or foraminous web or shroud

C416S185000

Reexamination Certificate

active

07086837

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 blàwer 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.

REFERENCES:
patent: 998889 (1911-07-01), Fraser
patent: 2307312 (1943-01-01), Whiting
patent: 3165257 (1965-01-01), Edwards
patent: 4186320 (1980-01-01), Hillman
patent: 2002/0060107 (2002-05-01), Kamoshita et al.
patent: 44 03 224 (1995-08-01), None
patent: WO 95/21330 (1995-08-01), None

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