There are many choices for electric kettles, and even remote control. When the electric kettle is plugged in, it does not mean that it will automatically boil water, because it has anti-electric devices, which brings convenience to users who need different water temperatures. A safe electricity environment.
1. According to the principle of heat expansion and contraction of the object. Heat ups and downs are commonalities of objects, but different objects have different degrees of heat rise and contraction. Made of copper metal sheets into contacts. Because copper is sensitive to heat expansion and contraction, when the temperature does not reach the set value, the copper metal sheet is in a curved shape, and its contacts are closed and connected. When the water is heated to the set temperature, the heat of the water is transmitted to the copper sheet on the thermostat. Because the heat is straightened, the contact is bounced to a power-off state. When the temperature drops, the copper sheet returns to the temperature. The original state turns the contacts into an energized heating state. The two sides of the double gold piece are conductors of different materials, and at different temperatures, the double gold pieces are bent due to different degrees of shrinkage, and the set contacts are touched or Switch to make the set circuit work. This is more direct and timely, and can accurately sense the water temperature.
2. The water in the pot is dried and powered off. There is an automatic temperature control circuit in the pot. The temperature sensor is connected in series. The boiling point of water is one Baidu. When the water is dried, the temperature will exceed one Baidu. At this time, the temperature sensor will circuit. Disconnected. The simple temperature sensor is a bimetal, which is often used in electric appliances such as electric iron water heaters. There are many types of temperature sensors. There are also semiconductor temperature sensors. This structure is simple, safe to use and reliable.
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