The electric kettle adopts steam intelligent induction temperature control, which has the functions of automatic power off after boiling and preventing dry burning and power off. With the needs of life, the current electric kettle is also developing in the direction of multi-function, such as anti-leakage, anti-scald, water locking and so on. Electric kettle has the advantages of fast heating speed, good insulation effect, strong filtering function and many styles.
brief introduction
Electric kettle is an electric appliance with intelligent steam induction control, overheating protection, automatic power-off when water is turned on, dry burning prevention and power-off, and rapid boiling.
Generally, there are: split power base, automatic water cut-off, water level indicator, power indicator, drying protection and other safety devices. The general technical index is about 1000W- 1500W, the capacity ranges from 1 to 2 liters, and the voltage is 220-240V V V. The voltage of 1 10V is used abroad, and there are also many domestic manufacturers.
classify
According to the structure, it is divided into in-line type and rotary type. In-line means that the pot body and base can't rotate, and the pot body is directly heated by the heating pipe; Rotary means that the kettle body and base can rotate 360 degrees and are heated by the heating plate. Most products on the market are rotary.
In order to ensure the safety of the electric kettle when the temperature control element fails, the electric kettle with PTC heating element appears.
principle of operation
The working principle of the electric kettle is that the steam generated when the water boils deforms the bimetal of the steam temperature sensing element, and the power switch is pushed by the deformed lever principle, so that the electric kettle is automatically powered off after the water boils. Its power failure can't be automatically reset, so the kettle won't be automatically reheated after power failure.
Using PTC heating element instead of heating tube can effectively prevent the fire danger caused by dry burning. The dry burning temperature of PTC heating element can be set at any temperature between 150℃ and 250℃. When the temperature reaches the set temperature, the resistance of PTC element increases rapidly, and the heating power drops sharply, keeping its temperature at the set temperature and not rising any more. The automatic temperature control performance of PTC heating element is absolutely reliable. It controls the temperature through the change of resistance in PTC body, not through any contact. So many high-grade electric kettles use PTC heating elements. However, many electric kettle designers are not used to using PTC heating elements, and PTC is expensive and bulky, so its application is limited.
PTC heating element has great advantages in heat preservation of electric kettle. The insulation power of the electric kettle is relatively small, and the use of PTC heating elements will not increase the cost. PTC heating element has the function of preventing dry burning, and the dry burning power is about one tenth of that of boiling water. When the temperature control element fails, the temperature of PTC itself remains low, so there is no danger.