Patent ID: 7125220

Claim:
An axial-flow type fan, comprising: a fan housing including an air inlet and an air outlet at its outer side, said air outlet having an air-expanding section for expanding an exhausting airflow exhausting from the air outlet; an air channel connecting the air inlet and the air outlet; a fan wheel received in the channel and including a hub; and a plurality of fan blades arranged about a rotary axis of the fan wheel and tilted on the hub, and each of the fan blades having an end-cornered cutting section, each of said end-cornered cutting sections having a leading point substantially aligned with a starting point of the air-expanding outlet, thereby reducing air turbulence on a surface of the air-expanding outlet; wherein when the fan wheel is rotated, the end-cornered cutting sections of the blades are able to eliminate air turbulence and air noise in the air outlet of the fan housing.