| 摘要 |
This blower is provided with an impeller 100 having a main plate fixed to a rotary shaft of a drive device, a shroud 1 having an air suctioning port 1a, and n number of blades 2 having leading edge front ends 2a arranged along a circle centered on the rotary shaft and between the main plate 3 and the shroud 1. When the angle formed by the leading edge front ends 2a of two adjacent blades 2 and the rotary shaft is assumed to be an installation pitch angle, the blades 2 are arranged such that all of the installation pitch angles α are different angles, and the installation pitch angles on both neighboring sides of an installation pitch angle αm, among the installation pitch angles α, become a combination other than a combination of an installation pitch angle αm-1 that is the next smallest with respect to the installation pitch angle αm and an installation pitch angle αm+1 that is the next largest with respect to the installation pitch angle αm. |
