Patent ID: 8043064

Claim:
A fan wheel, comprising: a hub defining an axial direction and a radial direction, the hub having a central portion, a side wall annularly disposed along the central portion, and a connection portion, in which the side wall has a top edge, a bottom edge opposite to the top edge and an outer surface between the top edge and the bottom edge, and the connection portion is rounded to connect the central portion and the top edge of the side wall; and a plurality of blades, each of the blades having an axial length and a radial length and extending outward along the radial direction and the axial direction sequentially from the outer surface of the side wall to form a tip above the top edge and a tail extending at least along the radial direction from the outer surface, in which each of the blades is gradually broadened from the tip to the tail, and the tip and the tail are curved; wherein the portion of each of the blades extending beyond the top edge along the axial direction accounts for substantially between one third and two thirds of the axial length, and the portion of each of the blades extending beyond the bottom edge along the axial direction accounts for substantially between zero and one third of the axial length.