| 摘要 |
An efficient axial fan has a housing enclosure with a square intake opening and a round outlet opening, a fan assembly with a drive motor and a propeller secured to a drive shaft and coupled thereto. The square intake opening is provided with a shutter assembly which comprises a square frame having a plurality of vanes including a central operative vane operated by a centrifugal shutter mechanism secured to one end of the drive shaft. The shutter assembly is removably mounted and adapted to be selectively mounted with vanes extending horizontally or vertically across the square intake opening. The centrifugal mechanism is provided with a hermetic housing comprising a pair of radial masses operatively connected by a pair of pivoting arms to an axial sliding actuator disposed adjacent to the shutter central operative vane for opening or closi ng the shutter assembly. The propeller further comprises a plurality of radial blades surrounded by a Venturi and provided with radial adjustable shoes to minimize the clearance between the Venturi and the propeller.
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