| 摘要 |
PROBLEM TO BE SOLVED: To blast air to a distance by leading air from a diffuser air flow passage near the outer periphery of a fan casing to a clearance between an air passage member on a thin sheet and the other side wall provided on a surface opposed to the side wall and blasting the air from a blasting port so as to assure the direction and velocity of the blasting air. SOLUTION: A clearance allowing air to flow axially from a centrifugal diffuser air passage 9 between a semi-circular fan casing and a first air passage member 3 to a centrifugal diffuser air passage rear space 10 is formed as follows. Namely, the clearance between the casing and the first air passage member 3 is constant on the upper half side, and a clearance between the main body side wall and the first air passage member 3 is increased toward the lower half side. Thus, the blast air from a propeller fan is concentrated downward, concentrated in a specified direction without diffusing the flow of air after being left from the fan, and blasted with the air volume and air velocity maintained. Thus, a large air volume can be blasted to a distance. |
