Heating Principle of Medium Frequency Electric Furnace
The intermediate frequency electric furnace is an induction heating device that heats metal materials based on the theory of electromagnetic heat flow mechanics. The subject of electromagnetic metallurgy is made up of the interdisciplinary subjects of electromagnetic thermohydrodynamics, that is, electromagnetism, thermodynamics and fluidics. The interaction and relationship between fluid and heat, fluid and electromagnetic, heat and electromagnetic Promote the birth of intermediate frequency electric furnace, so that the intermediate frequency electric furnace can be applied in industrialization.
Industrialization of intermediate frequency electric furnaces also observes several induction heating effects. These induction heating effects make the intermediate frequency electric furnaces heat more quickly. The following is a brief introduction to several major effects when the intermediate frequency furnace works.
- Surface effect of induction heating of medium frequency electric furnace. When the current passes through the conductor, the current density is the largest along the surface of the conductor, and the current density is smaller as it goes to the center;
- Proximity effect of induction heating of medium frequency electric furnace. When the current direction of the two current-carrying conductors is the same, the current flows from the outside of the two conductors, that is, the current density of the adjacent surface of the conductor is the smallest; on the contrary, if the current direction is opposite, the current flows from the inside of the two conductors The current density is the largest on the adjacent surface. This phenomenon is called the proximity effect of high-frequency current;
- Ring effect of induction heating of medium frequency electric furnace. When the current passes through a cylindrical, circular or spiral cylindrical tube, the maximum current density distribution concentrates on the inside of the cylindrical (circular or spiral cylindrical tube) part, and the current density inside the ring is the largest. Ring effect
- The sharp angle effect of induction heating of medium frequency electric furnace. Put sharp corners (angular corners) or irregularly shaped parts in a circular sensor. If the height of the parts is less than the height of the inductor, the sharp corners or corners in the loaded parts will have high eddy current strength during induction heating. Intense heating increases the temperature in a very short time and causes overheating. This phenomenon is called the sharp corner effect.