Classification of electric heaters
Electric heaters refer to electrical appliances that use electrical energy to achieve heating effects. They are distinguished by the type of heating method and can be divided into three categories:
1. Electromagnetic heating
Electromagnetic heating generates an alternating magnetic field through the components of the electronic circuit board. When the upper surface is placed on the iron-containing container, the surface of the container is cut and alternating magnetic lines of force to generate alternating current (ie, eddy current) in the metal portion at the bottom of the container, and the eddy current is made. The iron atoms at the bottom of the container move at high speed and irregularly, and the atoms collide with each other and rub to generate heat. Thereby the effect of heating the article. Because the iron container itself is hot, all thermal conversion rates are particularly high, up to 95%. Induction cookers, electromagnetic cookers are all using electromagnetic heating technology.
2. Infrared heating
The heat transfer form of infrared light is radiation heat transfer, which transfers energy by electromagnetic waves. When the far infrared ray is irradiated to the heated object, a part of the ray is reflected back and a part is penetrated. When the emitted far-infrared wavelength coincides with the absorption wavelength of the object to be heated, the heated object absorbs far-infrared rays. At this time, the molecules and atoms inside the object “resonate”—generating strong vibration and rotation, while vibration and rotation make The temperature of the object rises and the purpose of heating is achieved.
3. Resistance heating (Resistance heating)
A heating method of heating a billet by using a current to discharge heat through an electric heater. Common resistance wire heating, ceramic heaters, and resistance ring heating, quartz tube heating, in principle, are resistance heating.