Patent ID: 7551418

Claim:
A device for preventing internal combustion of equipment from spreading outwards, comprising a sampling circuit, a detecting and monitoring circuit connected to the sampling circuit and a low-voltage datum power supply; wherein the output of the low-voltage datum power supply is connected to the ground via the sampling circuit to form a loop circuit; the sampling circuit comprises at least two thermal detectors, the detecting and monitoring circuit comprises a first monitoring output end (out 1 ) and a second monitoring output end (out 2 ), the detecting and monitoring circuit monitors the output of the first monitoring output end (out 1 ) and the second monitoring output end (out 2 ) according to the working status of the thermal detectors as follows: the first monitoring output (Vout 1 ) is inactive and the second monitoring output (Vout 2 ) is inactive when the at least two thermal detectors are in normal status; the first monitoring output (Vout 1 ) is inactive and the second monitoring output (Vout 2 ) is active when some of the at least two thermal detectors are in abnormal status; the first monitoring output (Vout 1 ) is active and the second monitoring output (Vout 2 ) is active when the at least two thermal detectors are all in abnormal status; the first monitoring output (Vout 1 ) is configured to turn off a power supply, and the second monitoring output (Vout 2 ) is configured to drive an alarm unit without affecting the power supply.