| 摘要 |
<p>The present invention concerns a fan (10) which has pitch-adjustable fan blades (12). The fan is driven by a drive shaft (14) connected to an electric motor. The fan also includes an actuator (22) connected to the fan blades to cause adjustment of the pitch of the blades. An adjustor (24) is connected to the actuator, with the adjustor being movable between a first adjustor position and a second adjustor position. Movement of the adjustor causes movement of the actuator which causes adjustment of the blade pitch. The adjustor is connected to a stepper motor (28) which causes the adjustor to be moved axially from its first position to its second position. In one preferred application, the fan may be used in association with the evaporator and/or condenser of a refrigerator or cooler.</p> |
