Electric kettle turn on the power supply after 5 minutes, the water temperature is gradually increased to 100 degrees, and water begins to boil, steam impact the bimetallic strip above the switch, due to the Principle of thermal expansion and contraction, bimetallic strip expansion deformation, switch contact up to disconnect the power supply. If the steam switch failure, water in POTS would have been burned down, until the water is dry up, a sharp rise in the temperature of the heating element, located at the base of the heating plate has two bimetallic strip, because heat transfer temperature rise sharply, expansion deformation, disconnect the power supply. Therefore the safety protection device of the electric kettle is a very scientific and reliable. This is a principle of the electric kettle triple protection.
Use PTC heating elements instead of heat pipes, can effectively prevent the fire danger. PTC heating element of the dry heating temperature can be set at any temperature between 150 ℃ ~ 250 ℃, when the temperature reach the set temperature, the resistance of the PTC element increase rapidly, the heating power has fallen sharply, to keep the temperature in the set temperature and do not continue to rise. Automatic temperature control performance of PTC heating element is absolutely reliable, it depends on PTC resistance change and control the temperature of the body, rather than relying on any contact control. So now a lot of high-grade electric kettle adopted PTC antipyretic element. However, because now a lot of electric kettle design that people are not used to use PTC heating elements, combined with the higher price of PTC, relatively large volume, make its application is restricted.
Steam intelligent induction control:
Use boiling water when the water vapour bimetallic strip deformation of steam heat element, and use the deformation through the lever principle to push the power switch, which make water of the electric kettle to boil after the power. Its power is not reset, the kettle will not automatically when the power is cut off and then heating.
