AXIAL FLOW FAN

摘要

PURPOSE: An axial flow fan is provided to prevent cracks from being generated in a region of a hub even if the axial flow fan is used for a long time by dispersing stress concentrating on the region of the hub by forming a reinforcing unit to the hub region and not to worsen the flow performance of the air and increase the noise at the hub region by making one end of the reinforcing unit round. CONSTITUTION: An axial flow fan is composed of a hub(50) formed in an almost cylinder shape and rotated by the driving force of a motor; a plurality of blades(60) radially formed on the outer peripheral surface of the hub; and a reinforcing unit formed to a predetermined region of the blade at which the hub and a leading edge(62) are contacted, and thicker than the blade. The reinforcing unit comprises an inner reinforcing unit(60b) formed in an almost fan shape at the part contacting with the hub and the blade and at least one outer reinforcing unit(60a) separated from the inner reinforcing unit to the outside at the predetermined distance and formed in a circular arc-shape. Both ends of the outer reinforcing unit are connected to the leading edge and the hub, respectively.