| 摘要 |
An airflow-controlling damper mechanism consisting of a fixed frame in which a damper flap frame is rotatably mounted. The flap frame has damper segments pivoted therein on radial axes. A drive shaft is journaled axially in the fixed frame and has a drive gear meshing with gear segments carried by the damper segments. Respective thermoresponsive torsion springs connect the flap frame and the drive shaft through the fixed frame, one being responsive to the temperature of incoming air and the other being responsive to the temperature of room air, whereby to open or close the damper segments in accordance with the relative temperatures of the incoming air and the room air.
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