The circuit operation principle of the device is shown in the following figure. JS is a very thin wire that is wound several times around the object to be protected and then connected in series between pins 1 and 2 of the LSE. When the JS is intact, the LSE's 1 and 2 pins are colluded. At this time, the LSE 4 pin outputs a high level, the triode VT is turned off, the relay J is in the released state, and the two normally open contacts j1-1 and j1-2 are off. On, the solenoid valve YA on the water jet is closed. Once the protected object is on fire, the thin wire JS wound on the protected object is bound to blow, which is equivalent to the disconnection of pins 1 and 2 of the LSE, so that the 4 pin of the LSE outputs a low level, and the triode VT is turned on. Relay J is energized, the normally open contacts j1-1, j1-2 are closed at the same time, the power of the solenoid valve YA is turned on, and the YA pulls on the faucet to extinguish the fire. The faucet can be provided in plurality according to the specific situation, and the nozzle can surround the protected object.
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The circuit operation principle of the device is shown in the following figure. First, a piece of positive temperature coefficient switch thermistor RQ is adhered to the electric kettle with epoxy resin. Connect the two ends of the RQ to the 1st and 2nd feet of the LSE, insert the kettle into the power socket CZO, and squat the power switch S. At this time, because the water temperature in the kettle is low, the resistance of the RQ is small (<50K). Therefore, the 4 feet of the LSE output a high level, the relay J immediately picks up, the normally open contact j is closed, and the electric kettle is energized. After releasing the hand, the relay J contact is self-protected. Once the water boils (100 ° C), the resistance of RQ rises step by step, far greater than 50K, which is equivalent to the LSE's 1 and 2 legs are disconnected, so the LSE 4 pin outputs a low level, J is released, and its contact j is broken. Open, completely cut off the power supply of the electric kettle, so that the owner can go out without any worries after boiling water. Among them, RQ should use a switched-type thermistor with positive temperature coefficient, and its Curie point is 100 °C.
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