CENTRIFUGAL BLOWER, AIR-CONDITIONING DEVICE, AND REFRIGERATION CYCLE DEVICE

摘要

A centrifugal blower (10) having: a centrifugal fan (3) having a main plate (31) and a side plate (32) opposing one another in the rotational axis (A) direction; and a casing (7) housing the centrifugal fan (3). The casing (7) is equipped with a peripheral wall (73) extending along the outer peripheral edge (35) of the centrifugal fan (3), and has a tongue part (8) at one location on the peripheral wall (73). The distance between the outer peripheral edge (35) of the centrifugal fan (3) and the tongue part (8) is less on the main plate (31) side of the centrifugal fan (3) than on the side plate (32) side of the centrifugal fan (3). Beginning at the tongue part (8), the distance between the rotational axis (A) of the centrifugal fan (3) and the peripheral wall (73) of the casing (7) increases in the direction of rotation of the centrifugal fan (3). The ratio of increase of the distance between the rotational axis (A) of the centrifugal fan (3) and the peripheral wall (73) of the casing (7) is greater on the main plate (31) side of the centrifugal fan (3) than on the side plate (32) side of the centrifugal fan (3).