Patent Number: 7,086,837

Title: Centrifugal blower fan

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.

Inventors: Kamoshita; Tadashi (Nishi-Tokyo, JP), Iida; Giichi (Tokyo, JP)

Assignee: Kioritz Corporation

International Classification: F04D 29/66 (20060101)

Expiration Date: 8/08/02018