Active heating-type overheating protective device

一种主动发热式过热保护装置

Abstract

The invention discloses an active heating-type overheating protective device which is composed of a heating sheet 2, a pin 1 and a bimetallic strip 7. The bimetallic strip 7 is tightly attached to the heating sheet 2. The pin 1, a heating resistor 3 in the heating sheet 2 and the bimetallic strip 7 are serially connected in sequence. In use, the protective device is required to be serially connected with a controlled device, and current through the heating resistor 3 is enabled to be consistent with current of the controlled device. When the current of the controlled device is abnormally increased, and the heating resistor 3 actively emits heat to enable the bimetallic strip 7 to act quickly for disconnecting a circuit, so that the overheating fault of the controlled device is prevented. The bimetallic strip 7 is reset for connecting the circuit when the temperature of the controlled device and the temperature of the heating resistor 3 are lowered, and the controlled device can operate normally again. The protective device provided by the invention fully protects the safety operation of the controlled device, and the service life of the controlled device is prolonged.
本发明公开了一种由发热片2、引脚1、双金属片7组成的主动发热式过热保护装置,双金属片7紧贴发热片2,引脚1、发热片2内的发热电阻3、双金属片7依次串联,使用时需再与被控器具串联,使经过发热电阻3的电流与被控器具的电流保持一致,当被控器具的电流异常增大时,发热电阻3主动发热使双金属片7迅速动作切断电路,避免被控器具的过热故障,被控器具和发热电阻3温度降低时双金属片7复位接通电路,被控器具即可恢复正常工作,本发明充分保护了被控器具的安全运行,延长了被控器具的使用寿命。

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