| 摘要 |
PROBLEM TO BE SOLVED: To provide an axial flow fan equipped with a plurality of blades installed at certain angular intervals at the periphery of the boss part, with which the fan efficiency can be increased without increasing the structural width in the axial stretching direction. SOLUTION: An axial flow fan is equipped with a plurality of blades 13 at certain angular intervals at the periphery of the boss part 11, wherein the mounting angle Dθof each blade 13, chord length GEN, and side-face projected langth DEP are increased gradually from the blade root 13a toward the tip 13b, and the blade roots 13a are located nearer the air downstream end 11a of the boss part 11, and the air upstream end 13c of each blade tip 13b is positioned more inside than the air upstream end-face 11b of the boss part 11.
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