PROPELLER FAN, AND FAN, AIR CONDITIONER AND OUTDOOR UNIT FOR SUPPLYING HOT WATER PROVIDED WITH SAME

摘要

A propeller fan (1), which enables low noise to be achieved by suppressing air current leakage flows and high efficiency to be achieved by increasing the volume of air blow, has a boss (2) that contains an axis of rotation (O), a plurality of blades (3) disposed on the outer periphery of the boss, and bellmouths (9) positioned in such a manner as to partially surround the plurality of blades at the trailing edge of each. In a cross-sectional shape in the radial direction, each blade has a curved section (13) that bulges on the upstream side of an air current. When viewed from a blade cross section, when a tangent at the outer peripheral end is denoted as LQ, an imaginary line that intersects the axis of rotation (O) is denoted as LO, and the angle mutually formed by the tangent (LQ) and the imaginary line (LO) is denoted as the outer peripheral end tangent angle (theta), if the location where the imaginary line and the periphery of the blade intersect is regarded as an overlap starting point, and the position of the blade cross section that includes the overlap starting point is regarded as a corresponding point of the overlap starting point, said location is set in such a manner that the outer peripheral end tangent angle (theta) that is closer to the trailing edge than the corresponding point of the overlap starting point is smaller than the outer peripheral end tangent angle (theta) that is closer to the leading edge than the corresponding point of the overlap starting point.