PRODUCTION METHOD OF REVERSE FAN

摘要

A transverse fan is formed by concentrically arranging a plurality of fan impellers for integrally rotating the plurality of fan impellers around a fan axis. Each of the plurality of fan impellers comprises a plate and a plurality of blades each having a bottom end portion mounted on one side surface of the plate, a leading end portion opposite to the bottom end portion and a side surface portion connecting the leading end portion and the bottom end portion. Each of the blades is annularly arranged around the fan axis so that each of the blades is inclined at a predetermined angle along to the rotating direction with respect to the fan axis. The side surface portion of each of said blades includes an outer edge portion which is the farthest portion from the fan axis in the side surface portion and an inner edge portion which is the closest portion to the fan axis in the side surface portion. The outer edge portion and inner edge portion are curved outward with respect to the fan axis, respectively.