| 摘要 |
PROBLEM TO BE SOLVED: To provide an axial fan easily achieving the optimum design by reducing loss in consideration of a radial component in a flow of air to be sucked in, and further improved in efficiency. SOLUTION: An impeller 20 is formed by providing a plurality of blades 21 on an outer circumference of a hub 22 to be a center of rotation of the impeller 20. Winglets 26 and 27 are provided on at least one part of a blade tip part 25 forming an outer circumference portion in each of the plurality of blades 21 to further form small blades. The winglets 26 and 27 are formed such that tips are oriented toward an upstream side of an axial flow direction. COPYRIGHT: (C)2007,JPO&INPIT
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