BLOWER AND HEAT PUMP UTILIZING SAID BLOWER

摘要

The rear edge side outer peripheral edge of the propeller fan 3 rotated and driven by a motor 6, a propeller fan drive unit, is surrounded by a bell mouth 4. An upper plate 8, a lower plate 9, a side plate 10, and a machine room plate 11 are provided that are two or more plates constituting an air duct at the suction side outside radial direction of the propeller fan. The cross-section of the bell mouth at a first position in the vicinity where a blade of the propeller fan approaches the most and where the distance between the propeller fan and the plate constituting the air duct outside the radial direction is relatively narrow is made to be such that an expansion angle ¸1 of a bell mouth suction side is made small, that overlapped height Hb of the propeller fan and the bell mouth is made large against a cross-section at a second position where the distance between said propeller fan and a plate is relatively large and that a shape of the cross-section of the bell mouth is made to change gradually between the first position and the second position.