| 摘要 |
PROBLEM TO BE SOLVED: To prevent stress concentration to a recess in an axial flow fan having vanes in which the recess concaved toward the leading edge is formed on the trailing edge.SOLUTION: The axial flow fan (70) having vanes (91) in which recesses (101) that are recessed toward the leading edge are formed on the trailing edge, with stress-relaxation parts (105), having a rounded shape at the positive-pressure-surface side and the negative-pressure-surface side in a cross-sectional view of the vanes (91), being formed at the edge part of the leading-edge side of the recesses (101). |
