Patent ID: 8092170

Claim:
An axial fan comprising an air inlet on one side and an air outlet on an opposite side along an axis of the fan, comprising: a base having a central tube extending outwardly therefrom; a stator around the central tube of the base; a bearing received in the central tube of the base; and a rotor rotatably supported by the bearing, the rotor comprising a hub, a plurality of rotary blades extending outwardly from the hub, and an annular wall surrounding the rotary blades, the annular wall connecting to outer ends of the rotary blades to rotate with the rotary blades to guide airflow from the air inlet to the air outlet during rotation of the rotary blades, a guiding portion extending outwardly from the annular wall, the guiding portion being convergent along the axis of the fan from the air inlet towards the air outlet, an outer face of the guiding portion inclining outwardly relative to an outer face of the annular wall.