| 摘要 |
PURPOSE:To maximize the synergistic effect of fans for preventing the frosting hazard by a method wherein electric power, sent to the fans for preventing the frosting hazard, is sent by commands to align uncontrolled ventilating directions of respective moving fans for preventing frosting hazard. CONSTITUTION:The conduction of an auxiliary motor a3 is effected by closing a fixed contact 14. When the rotation of the motor is initiated and a protuberance a9 is contacted with a rod a12, a movable contact all is returned to the normal position thereof and the fixed contact a10 is closed, therefore, sub fan a2 oscillates the neck thereof in accordance with the ventilating direction of a main fan 2. Thereafter, when a difference is caused between the oscillating directions of the main fan 2 and the sub fan a2, the above described motion, is repeated and the oscillating direction of fans may be aligned at the starting point of the oscillation. |
