| 摘要 |
A fan has an associated centrifugal mechanism and a shutter, comprising a plurality of pivoted vanes and a central vane pivotally interconnected with a pair of heavy tie rods. The centrifugal mechanism is driven by the fan propeller and comprises a hermetic housing wherein are located, symmetrical spaced apart in rapport to the fan axis, at least a pair of radial sliding masses operatively connected with flexible cables to an axial sliding reciprocating actuator which is disposed at proximity of the shutter central vane. When the fan starts to operate in either direction by an electric motor, the radial masses slide radially by centrifugal action and pull the axial reciprocating actuator away from the central vane, allowing the shutter heavy tie rods, to open the shutter. When the fan stops, an internal spring housed within the axial sliding reciprocating actuator pushes it against the central vane causing the closing of the shutter. The fan comprises a compact casing split into half portions connected together by a central structural member holding an electric reversible motor and the propeller.
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