BLOWER AND HEAT PUMP UTILIZING SAID BLOWER

摘要

The peripheral edge at the rear edge of a propeller fan (3), which is driven by a motor (6) serving as a propeller fan driver, is covered with a bell-mouth (4). Multiple plates, namely, a top plate (8), a bottom plate (9), and side plates (10) which constitute an intake-side air duct on the outside of the propeller fan in the radial direction, and a machine room plate (11) are provided. In the cross-section of the bell-mouth at the position where the blades of the propeller fan are closest front to back at a position on the plates where the distance between the propeller fan and the plates that constitute the air duct on the outside in the radial direction is relatively small, the widening angle (?1) of the bell-mouth on the intake-side is set smaller, and the height (Hb) of overlap of the propeller fan and the bell-mouth is set higher, than those in the cross-section at the position where the distance between the propeller fan and the plates is relatively large, and the cross-sectional shape of the bell-mouth is changed gradually between the two positions.