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    • 2. 发明授权
    • Ventilator controller for a greenhouse
    • 温室通风控制器
    • US3601675A
    • 1971-08-24
    • US3601675D
    • 1970-07-09
    • ICKES BRAUN GLASSHOUSES INC
    • RADTKE CARL
    • G05D23/275G05B7/00
    • G05D23/275G05D23/192
    • A controller for opening and closing a ventilator for a greenhouse in response to temperature sensed by a thermostat within the greenhouse. The ventilator is opened and closed by a single-phase capacitor start motor having a centrifugal switch connected in series with its starting winding. The motor is controlled by a reversing relay which is coupled to the motor so as to cause the motor to drive in a direction to open the ventilator when an open-relay coil in the relay is energized and to cause the motor to drive in a direction to close the ventilator when a close-relay coil within the relay is energized. A delay system is provided to prevent the motor from being energized to reverse its direction of rotation for a time period sufficient to enable the centrifugal switch to close. The delay system is arranged so that when the thermostat first calls for a reversal of the drive motor it actuates a delay motor. The delay motor drives a cam which, after a delay sufficient to enable the centrifugal switch to drop out actuates a switch means to disconnect the delay motor and to energize the close (or open) relay, thus energizing the drive motor.