IMPELLER OF AIR-CONDITIONING FAN

摘要

PROBLEM TO BE SOLVED: To improve the static pressure efficiency of an impeller of an air- conditioning fan. SOLUTION: The sectional shape of a blade in the radial direction is formed of a recessed curve to the windward side on the outer circumferential side of a part close to a middle point E-E, and a projecting curve to the windward side on a hub 3 side from part close to the middle point. The radius of curvature of the curve recessed to the windward side on the outer circumferential side of the part close to the middle point is increased toward a sectional part C-O in the radial direction close to a trailing edge of the blade from a sectional part A-O in the radial direction of a leading edge side of the blade.