Fan apparatus

Abstract

There is provided a fan apparatus having a high-strength structure for supporting an impeller and a motor with good air quantity characteristics. The fan apparatus has a motor, an impeller, a motor base portion, a frame and a plurality of spoke portions. The impeller has a plurality of blades and are arranged to be rotated by the motor. The motor base portion supports the motor. The frame has an annular inner peripheral wall formed to surround the impeller as viewed from a rotation axis direction. The spoke portions connect the motor base portion and the frame. An end portion of the blade in the side of the frame is inside the inner peripheral wall and a blade portion having a length not less than half the length of the blade in the rotation axis direction is exposed, as viewed from a direction perpendicular to the rotation axis direction.

What is claimed is: 
     
         1 . A fan apparatus comprising:
 a motor base portion;   a motor arranged on an upper side of the motor base portion;   an impeller having a plurality of blades and arranged to be rotated by the motor;   a frame having an annular inner peripheral wall formed to surround the impeller as viewed from a rotation axis direction; and   a plurality of spoke portions connecting the motor base portion and the frame, wherein a lower end portion of each of the blades is inside the inner peripheral wall, and a blade portion having a length not less than half the length of the blade in the rotation axis direction is exposed, as viewed from a direction perpendicular to the rotation axis direction.   
     
     
         2 . The fan apparatus according to  claim 1 , wherein a value obtained by dividing a distance between an upper end portion of the inner peripheral wall and the lower end portion of the blade by a dimension of the frame in a vertical direction is not less than  0 . 35 , and the lower end portion of the blade is above a position in contact with the spoke portion.