BLOWER

摘要

A blower fan includes a plurality of blades radially extending from a boss provided at the rotary center and spaced apart from each other in the rotational direction, and a ring portion connecting outer peripheral ends of the blades in a ring shape. An inner peripheral wall surface of an end part on an air-flow downstream side of a cylindrical portion is disposed on the outside in a radial direction of the rotary shaft in the blower fan, with respect to an end part on the air-flow downstream side of the ring portion. The end part on the air-flow downstream side of the cylindrical portion is positioned outward in the radial direction of the rotary shaft, as toward the air-flow downstream side. Thus, the blower can prevent the backflow air from being swirled, thereby reducing noise.

主权项

1. A blower comprising:
an axial flow blower fan that is rotatably driven to generate an airflow; and a shroud provided with a suction port through which air is drawn into the blower fan, and an air outlet through which air is blown out of the blower fan, the blower fan including: a plurality of blades radially extending from a boss provided at a rotation center and spaced apart from each other in a rotational direction; and a ring portion connecting outer peripheral ends of the blades in a circumferential direction, wherein an inner peripheral wall surface of an end part on an air-flow downstream side of the air outlet is disposed on an outer side in a radial direction of a rotary shaft in the blower fan, with respect to an end part on the air-flow downstream side of the ring portion, and the end part on the air-flow downstream side of the air outlet is positioned outward in the radial direction of the rotary shaft, as toward the air-flow downstream side.