Patent ID: 6899521

Claim:
A heat-dissipating fan comprising: a casing having an air outlet, an impeller being adapted to be mounted on a base and having a plurality of blades; a plurality of non-interconnected ribs each mounted between the base and the casing, each said rib including in sequence at least a first radial guiding portion, a first circumferential guiding portion, and a second radial guiding portion, each of the fist radial guiding portion and the second radial guiding portion extending in a direction having an inclining angle with an axial direction of the air outlet, the first radial guiding portion, the first circumferential guiding portion, and the second radial guiding portion guiding airflow passing through the air outlet and increasing wind pressure of the airflow when the impeller is turning, wherein said first circumferential portion separates said first and second radial guiding portions to cause said first radial guiding portion to be mis-aligned with the second radial guiding portion along a radial direction.