Patent ID: 7351032

Claim:
A heat dissipating fan comprising: a fan-supporting cover plate including an air inlet and a fan-supporting base; an impeller mounted to an upper side of the fan-supporting base to constitute a fan unit, and the impeller further including a plurality of impeller blades; and an air guiding member including an annular sidewall that defines an air passageway between a first end and a second end of the air guiding member, such that said air guiding member is a single hollow member, there being no part of said air guiding member formed in the air passageway, said first end of the air guiding member connecting to said cover plate in a stacked relationship, and the air guiding member further including an air outlet proximate to said second end of the air guiding member beyond the fan unit such that the air outlet disposed at said second end can be expanded; a portion of an axial height of said impeller blades being received in a first section of the air passageway of the air guiding member defined between the air inlet and a middle point of the air guiding member and a lower portion of a hub portion of the fan unit received in the first section of the air passageway of the air guiding member so as to reduce an overall thickness of the combination of the fan unit and the air guiding member, and a second section of the air passageway of the air guiding member defined between the middle point and the air outlet of the air guiding member below the fan unit, the air passageway being unobstructed from the fan-supporting base to the air outlet; a plurality of auxiliary side inlets being defined between the cover plate and the air guiding member, air intake occurring simultaneously in the air inlet and in the auxiliary side inlets when the impeller turns, the side wall confining air in the second section of the air passageway whereby the confined air passes through near regions below the hub portion of the fan unit and then exits the expanded air outlet in a predetermined direction.