TURBO FAN AND AIR CONDITIONER

摘要

A turbo fan is provided with a shroud (3), a main plate (2), and a plurality of blades (4). An inner periphery-side blade leading-edge section main plate-side section (4a11): curves in such a manner as to recede from a blade trailing edge (4b) and a central axis of rotation (RC), as the inner periphery-side blade leading-edge section main plate-side section (4a11) recedes from the main plate; and curves in a curved surface that curves in a direction that is rearwardly convex in the direction of rotation (RD). A main plate-side shoulder surface section (4a14): curves in such a manner as to recede from the central axis of rotation while approaching the blade trailing edge, as the main plate-side shoulder surface section (4a14) recedes from a main plate-side blade leading-end section (4a13); and has a concave-convex shape that includes a blade leading-end section (4a3) and the main plate-side blade leading-end section (4a13). An inner periphery-side leading-edge section (4a1) comprises: the inner periphery-side blade leading-edge section main plate-side section (4a11), which includes a curve that protrudes to the rear in the direction of rotation (RD); and an inner periphery-side blade leading-edge section leading end-side section (4a12).