| 摘要 |
PURPOSE:To enable to automatically open and close a damper in linkage with a ventilating fan with respect to an opening and closing device for damper which is employed in operation to open and close a hood of a kitchen room, and a duct for removing offensive smell in a toilet or moisture in a bath room. CONSTITUTION:With a power source switch S turned ON, an alternating current voltage is applied to a ventilating fan F which starts to rotate, and simultaneously, the voltage is also applied to an input terminal of a transformer circuit B to energize a relay X1 connected to an output terminal thereof, the normally-open contacts b and b' of a contact part X1' are turned ON, while the normally-open contacts d and d' of a contact part X1'' are also turned ON, and a DC motor or a damper 1 starts to perform a rotational movement, in which case, a DC voltage is applied also to a capacitor C1 through a diode D4 to charge said capacitor C1. If the damper 1 reaches an OFF position, an OFF-direction terminal limit switch LS1 is turned OFF by a cam attached to the rotational shaft of the DC motor M to intersect energization to the DC motor M. In case the power switch S is opened, or in case a contact is turned OFF with a relay X2 actuated through perceiving of a fire by means of a smoke sensor, the relay X1 is released from energization, and the charged current of the capacitor C1 flows to reversely rotate the DC motor M, which results in the rotational movement in an ON direction of the damper 1. |
