| 摘要 |
PURPOSE: A damper device for ventilation is provided to simplify a structure by constituting a driving part, which automatically opens and closes a damper, using only a micro switch, a cam, and a relay. CONSTITUTION: A damper device for ventilation comprises a damper(20), a motor(30), a cam(40), and a microswitch(50). The damper is rotatably installed in a damper body(10) which is connected to a duct for the ventilation of a building. The motor opens and closes the damper body by the damper. An eccentric protrusion(41) is formed in the circumference of the cam. The protrusion comprises a top point(40B) and a bottom point(40A). The microswitch is installed in the damper body and controls power supply to the motor.
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