Working principle: After the electric kettle is turned on for about 5 minutes, the water temperature gradually rises to 100 degrees, the water starts to boil, the water vapor deforms the bimetal of the steam sensing element, and the top open switch contact is disconnected from the power supply. If the steam switch fails, the water in the kettle will continue to burn until the water is dried. The temperature of the heating element rises sharply. There are two bimetals at the bottom of the heating plate, which will rise sharply due to heat conduction, and will expand and deform. Turn on the power.
Therefore, the safety protection device of the electric kettle is designed to be very scientific and reliable. This is the triple safety principle of the electric kettle. Insulation principle: Most of the kettles with heat preservation function have two heat pipes. One heat insulation tube is separately controlled by the heat preservation switch, which allows the user to control whether to keep warm. The insulation power is generally below 50W, and it usually consumes no more than 0.1 kWh per hour. Electric kettle purchase 1 volume.
Electric kettles are generally in the range of 1.7~2.0L. According to their own situation and actual needs, the general 2-3 people can choose 1.2L~1.5L electric kettle; 4-5 people can choose 1.8L~2.0L electric kettle. 2 appearance. Look carefully from inside to outside. By the way, shake it and shake it. Look at the electric kettle work, is the seam tight? Is there any burr on the plastic parts and is the material uniform? Whether the metal body is smooth and shiny. Large factories usually have strict inspections at the factory. Generally, these problems are avoided. Is the workmanship excellent? If it is shaken, there is a sound, and the kettle body is loose, which is an unqualified quality problem. 3 electrical performance. Read the instructions at the time of purchase, with or without CCC mandatory certification. At the time of purchase, you can test burn, whether the nominal heating power is met, and whether the boiling time is as expected. Whether the insulation performance is good, not hot.
Check if the temperature control device is normal. The current electric kettle has a temperature control device and is powered off after boiling. This will prevent dry burning. 4 quality. The electric kettle switch principle is that when the water boils, the steam passes through the conduit to thermally deform the metal piece of the temperature sensing element, thereby de-energizing. The power-off process is irreversible, so there is no secondary heating. The temperature control component will automatically power off after the water boils, and will not dry. This is still very safe. 5 people. There are elderly people and children in the home, it is recommended to use insulated electric kettle. This type of kettle has a special anti-scalding, anti-dumping and overflow design to protect the elderly and children.