| 摘要 |
PURPOSE:To prevent a secondary disaster resulting from burning and suspension of a ventilating fan from occurring, by a method wherein a heat sensing switch opening at a predetermined temperature is built in a motor, through which heating of the motor is sensed. CONSTITUTION:The titled device is constituted with a motor 1 for driving of a ventilating fan and a heat sensing switch 2, which is closed when it is heated up to a predetermined temperature TON. An alarm lamp 3 is attached to the front of the ventilating fan. When a driving motor 1 of the ventilating fan is heated and reached to the temperature TON, the heat sensing switch 2 is closed and the alarm lamp 3 is lit. The temperature TON may be set up at a temperature between the maximum temperature T1 at the time of normality of the motor 1 for driving of the ventilating fan and a burning temperature T2 of the motor 1. |
