PROPELLER FAN, AND FAN, AIR-CONDITIONER AND OUTDOOR UNIT FOR HOT-WATER SUPPLY PROVIDED WITH PROPELLER FAN

摘要

A propeller fan (1) with which it is possible to have both increased efficiency resulting from an increase in the amount of air which is blown out, and a reduction in noise resulting from the suppression of air flow leakage. The propeller fan (1) comprises: a boss (2) including an axis of rotation line (O); a plurality of blades (3) which are provided on the outer periphery of the boss (2); and a bell-mouth (9) which is arranged so as to enclose each of the plurality of blades (3) on the rear edge sides thereof. Each of the blades (3) has, in the radial-direction cross-sectional shape thereof, a curved section (13) which bulges to the upstream-side of the air flow, and the curve of a curved section of the blade on the inner side of the bell-mouth is more gentle than the curve of a curved section of the blade on the outer side of the bell-mouth.