| 摘要 |
The axial flow fan structure has an outer ring and an inner ring that establish an annular air passage. An odd-number of arms join the inner and outer rings together and at least one of the arms is skewed with respect to a radius of the annular air passage in order to reduce noise and vibration and to increase fan efficiency. Labyrinth air passages are provided between the fan and the outer ring to impede air blow-past and to improve further efficiency and noise reduction. Internal vanes are also provided to cool the fan-driving motor in which each of the vane members have at least two edges, the respective edges forming different angles relative to the axis of fan rotation.
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