| 摘要 |
PURPOSE: A ventilation fan automatically/manually opening and closing is provided to automatically or manually discharge air in a plastic film greenhouse. CONSTITUTION: A fan comprises a discharge fan(51); a discharge fan driving motor(52); an upper/lower limit switch panel(55); a guide panel member(56); a lower case(50); multiple guide rods(62); a gear rod member(57); an upper case(70); and a control box. The discharge fan discharges air in a plastic film greenhouse to outside. The upper/lower limit switch panel has an upper limit switch(53) and a lower limit switch(54) formed thereon. The guide plate member has a screw groove on a center of an inner upper part thereof and guiding grooves formed on ends of both sides thereof. The lower case covers the discharge fan, the driving motor and the guide plate member and is fixed to the plastic film greenhouse. The guide rods are inserted into the guiding grooves of the guide panel member to move up and down. The gear rod member is inserted into the screw groove of the guide panel member to move up and down. The upper case has the guide rods and the gear rod fixed therein to move up and down. The control box is fixed on an outside of the upper case and covered by a protection cap(61) to control operation of a deceleration motor(60) rotating the gear rod and the discharge fan driving motor.
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