Patent ID: 7500826
Filing Date: 2009-03-10
Classification: F04D

Abstract:
1. A centrifugal fan, comprising: a housing; a circular base; a driving mechanism, mounted on the circular base; at least two support brackets, linking the circular base to the housing, the support bracket profiles are involute curves based upon the circular base; and multiple centrifugal impellers, driven by the driving mechanism and sucking airflow into the housing through void spaces among the support brackets, wherein the involute curves are generated according to the equation V=Le V being an involute curve; L being the distance between a point of the involute curve and a center of the circular base; R being the radius of the circular base; T being a parameter from zero to infinity; and θ being an angle between an initial line and a line, linking the point of the involute curve and the center of the circular base.