To provide a silent axial flow fan having excellent air blow efficiency.
In this axial flow fan, a blade positioned on the leeward side is deviated 60-70 forward in the rotating direction from a blade positioned on the windward side. Each blade comprises a trailing edge part on an air outflow side, a leading edge part on an air inflow side, and an outer peripheral part which forms the outer periphery of the blade. The contour line of the trailing edge part has a reverse arcuate recessed part recessed in the air inflow direction opposite to the air outflow direction. Where the length between the inner peripheral end of the trailing edge part and the outer peripheral part of the blade is A and the arcuate radius of the recessed part is B, 0.35B/A0.53.
| JP5413449 | Axial fan |
| WO/2017/095029 | BLOWER FAN AND AIR CONDITIONER HAVING SAME |
| JP3109466 | IMPELLER FOR FAN |
Shunguchi Sekiguchi
Akio Saruwatari
Osamu Kawamura
Takehiko Yamada
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