Cross flow fan

Abstract

A cross flow fan mainly includes an enclosure, a cross fan and a motor. When the cross fan rotates by the motor, air is drawn into the cross flow fan through the intake hole and then is exhausted through the ventilating hole. The device is characterized in that the ventilating hole and the intake hole is located on the position of 0 degree and 180 degrees respectively and the end point of the arched wind fending board is located on the range from 70 to 150 degrees. The wind fending board installed between the intake hole and the ventilating hole is arched in an radian a bit larger than that of the fringe of the cross fan so as to have better ventilating efficiency.

What is claimed is:  
     
         1 . A cross flow fan comprising 
 an enclosure having an intake hole, a ventilating hole, a wind fending board and a wind guiding plate,    a cross fan,    and a motor,    wherein said intake hole and said ventilation hole are disposed on said enclosure, the position outside the blades of said cross fan; said wind fending board is located on the top side of said intake hole and said ventilating hole while said wind guiding plate is arranged on the bottom side thereof; when said cross fan rotates by said motor, air is drawn into the cross flow fan through said intake hole and then is exhausted through said ventilating hole; the improvement of the present invention is characterized in that when the vertical line of the rotating axis of said cross fan is on the position of 90 degrees, said ventilating hole and said intake hole is located on the position of 0 degree and 180 degrees respectively and the end point of said arched wind fending board is located on the range from 70 to 150 degrees; said wind fending board arranged between said intake hole and said ventilating hole is arched in an radian a bit larger than that of the fringe of said cross fan.