| 摘要 |
PROBLEM TO BE SOLVED: To reconcile the improvement in fan performance with the sufficient reduction in noise. SOLUTION: In an axial flow fan having an impeller having a plurality of blades 21 circumferentially provided around a rotating shaft, the central camber line in a section of the blade 21 when cut in a cylindrical surface around the rotating shaft has a form having a linear part A provided on the blade front edge part 21a side substantially in the same direction as the non-collision inflow directionβi1 of a gas to the blade surface, and a curved part B provided on the blade rear edge part 21b to continue the outflow directionβo1 of the gas from the blade surface to the linear part A. Therefore, the gas supplied from the blade front end part 21 is flowed along the linear part A and guided to the curved part B to form a flow close to an ideal, flow free from loss.
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