To provide the structure of a centrifugal radiation fan that can increase the amount of air entry by sucking an auxiliary air current in the radial direction around a casing by an auxiliary air inlet in the radial direction, and can increase the smoothness of air entry and can reduce noise by the air entry since the inner-periphery wall of the auxiliary air inlet in the radial direction is formed to be inclined according to the blowing direction of an impeller and a plurality of inner-drawn guide plates are formed on the inner-periphery surface of an annular wall according to the blowing direction of the impeller.
The centrifugal radiation fan comprises the casing, a cover plate, and the impeller. An inner space, an air outlet in the radial direction, the annular wall, and at least one auxiliary air inlet in the radial direction are provided in the casing. An axial air inlet is provided on the cover plate. The impeller is rotatably provided in the inner space. The auxiliary air inlet in the radial direction is provided on the annular wall and is formed so that the auxiliary air inlet in the radial direction can be distinguished from the air outlet in the radial direction in terms of structure, thus allowing the impeller to simultaneously suck an axial air current and the auxiliary air current in the radial direction from the axial air inlet and the auxiliary air inlet in the radial direction, respectively, when the impeller is rotated.
LU YU-YUAN
FANG MEI-CHIH
Mitsuo Matsuda