| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a protection device for small electric compressor capable of surely executing a final protection action at the time of abnormal high temperature. <P>SOLUTION: In the protection device 1 for the electric compressor, a heat generating structure body 7 is arranged in electrically series with a motor in a sealed vessel, and a heat generating part 7A of the heat generating structure body 7 is put between an electrically insulating retention body 8 and a heat radiating contact 10. Heat of the heat generating part 7a is conducted by the heat radiating contact 10 to the sealed vessel via a thermal action plate 9 and is radiated to coolant flowing around the same during normal operation of the motor. If temperature of coolant abnormally rises, heat from the heat generating part 7A is not easily radiated since the sealed vessel itself is heated, temperature of the thermal action plate 9 rises and a bend orientation is reversed to separate the heat radiation contact from the heat generating structure body. Consequently, heat from the heat generating part loses where to go and temperature rises further, and finally, temperature reaches fusing temperature to shut off an electric circuit. <P>COPYRIGHT: (C)2008,JPO&INPIT |
