Patent ID: 7207779
Filing Date: 2007-04-24
Classification: F04D

Abstract:
1. An impeller for a radial-flow heat dissipating fan, comprising: a hub having a circumference; a plurality of blades surrounding the hub, the blades including a first blade set and a second blade set; and at least one connecting member connecting the blades to the circumference of the hub and separating the blades from the circumference of the hub, said at least one connecting member comprising at least one rib; the impeller including an air inlet side and a bottom side, wherein blades of the first blade set and the second blade set have a bottom edge located at the bottom side, and the blades of the first blade set extend beyond the blades of the second blade set at the air inlet side such that distribution of the blades at the air inlet side of the impeller is sparser than that at the bottom side of the impeller, thereby increasing an air inlet amount.