Patent ID: 7864525
Filing Date: 2011-01-04
Classification: G06F

Abstract:
1. A centrifugal blower for being mounted in an electronic device to generate an airflow in the electronic device, the electronic device having a cover defining an air inlet, the centrifugal blower comprising: a supporting member for being mounted on the cover at a position near the air inlet; and an impeller rotatably mounted to the supporting member, the impeller comprising a hub and a plurality of blades extending radially and outwardly from an outer circumferential surface of the hub, each of the blades comprising an inner portion located over the supporting member and an outer portion extending beyond the supporting member along a radial direction of the hub, a height of the outer portion being larger than that of the inner portion for increasing a size of the blades; wherein the supporting member comprises an annular base plate, a central tube extending up from the base plate for supporting the impeller, and a plurality of ribs extending horizontally and outwardly from an outer periphery of the base plate, an outer diameter defined by free ends of the ribs of the supporting member being smaller than an outer diameter defined by the free ends of the blades; and wherein the outer portion of each of the blades comprises a bottom face being not higher than a top surface of each of the ribs of the supporting member.