Patent ID: 6217285
Filing Date: 2001-04-17
Classification: F04D,Y10S

Abstract:
An impeller for use in a centrifugal blower comprising a hub for receiving driving torque at a central portion thereof, a shroud of a ring-like shape in plan formed with an opening for air intake at the center thereof and opposed to said hub across a distance therebetween, and a plurality of vane members interposed between said hub and shroud as circumferentially spaced from one another at intervals,the impeller having an arrangement wherein an edge on the inner side of each vane member, into which air is guided, has varied angles with respect to a tangent line thereat thereby conforming to inflow angles of an air flow guided into the vane member at different points of a span between the hub and shroud, and wherein the edge on the inner side of each vane member has a straight-line portion extending between the hub and the shroud and parallel to an impeller axis.