HIGH EFFICIENCY, LOW-NOISE, AXIAL FAN ASSEMBLY

摘要

A high efficiency fan (16) and stator arrangement for generating an airflow through a heat exchanger is disclosed herein. The fan (16) is rotated about its rotational axis by an electric motor, and includes eight blades (22) extending radially from a hub (54) to a circular band (38). Each fan blade (22) has a stagger angle and chord lengths which vary along the span of the blades (22). Each fan blade (22) also includes a trailing edge (60) having a flat surface extending along the edge. The flat surfaces of each fan blade a re coincident with a plane perpendicular to the rotational axis. The fan produc es an airflow when rotated about the rotational axis, wherein a component of th e airflow occurs at a first angle to the rotational axis. The fan support has a central bearing support and twenty elongated airfoils extending radially outward from the bearing support. Each airfoil has substantially the same length as the fan blades (22) and includes a curved airflow guiding surface having a leading edge and a trailing edge downstream from the leading edge. The curve of the guiding surface is a generally circular arc with a tangent to the guiding surface at the leading edge substantially at the first angle to the rotational axis, and a tangent to the trailing edge at a second angle to the rotational axis less than the first angle. The fan support is located downstream of the heat exchanger to guide the airflow produced by the fan through the heat exchanger.