AIR-CONDITIONING PROPELLER FAN

PROBLEM TO BE SOLVED: To reduce a quantity of materials to be used, reduce a cost, improve strength, and reduce a noise by providing lattice-shaped ribs arranged on the inside diameter side from a specific % position of a radius of a fan on a negative pressure surface of fan blades. SOLUTION: Plural fan blades 7 are obliquely arranged in a radial shape in the radial direction to a shaft hole 3 on an outer peripheral surface of an annular ring-shaped hub 2 having the shaft hole 3 in the center. A peripheral directional rib 4 and a radial directional rib 5 are ribs arranged in a lattice shape. These are arranged in a plurality on the inside diameter side from a 50% position of an effective redius of a fan 1 on an anti-rotation side surface (a negative pressure surface 9) of the fan blades 7 with an outer peripheral surface of the annular ring-shaped hub 2 as a reference. Therefore, the vicinity of the annular ring-shape hub 2 is arranged in a lattice shape, but an outer peripheral part and the radial direction are constituted of minimum ribs of a range where the blades 7 are not deformed. Therefore, rigidity of the baldes 7 is largely improved, a quantity of materials to be used is reduced, a cost is reduced, strength is improved, and a noise can be reduced.