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Working principle of electromagnetic induction heater

Author: Zhongshan Shengchi Electronic Technology Co., Ltd.: industry dynamic release: 2020-05-14 02:06:46 reading: (482)
Abstract: The principle of electromagnetic heating is to produce alternating magnetic field through the components of the electronic circuit board. When the iron container is placed above the container, the surface of the container is cut alternating magnetic field line and the alternating current (i.e. eddy current) is generated at the bottom part of the container. The eddy makes the iron sub part of the container move irregularly at high speed, and the molecules collide and rub with each other to generate heat. Thus, the effect of heating articles is achieved. Because iron containers are self heating, all thermal conversion rates are particularly high, up to 95%. At present, induction cookers and electromagnetic cookers are electromagnetic heating technologies. Electromagnetic heating technology can be widely used in plastic injection machines, extruders, blown film machines, wire drawing machines, plastic films, pipes, wires and other machines, food processing, textile, printing and dyeing, metallurgy, light industry, and so on.
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The principle of electromagnetic heating is to produce alternating magnetic field through the components of the electronic circuit board. When the iron container is placed above the container, the surface of the container is cut alternating magnetic field line and the alternating current (i.e. eddy current) is generated at the bottom part of the container. The eddy makes the iron sub part of the container move irregularly at high speed, and the molecules collide and rub with each other to generate heat. Thus, the effect of heating articles is achieved. Because iron containers are self heating, all thermal conversion rates are particularly high, up to 95%. At present, induction cookers and electromagnetic cookers are electromagnetic heating technologies.

Electromagnetic heating technology can be used.

Industrial electromagnetic energy saving transformation is widely used in plastic injection machines, extruders, blown film machines, wire drawing machines, plastic films, pipes, wires and other machines, food processing, textile, printing and dyeing, metallurgy, light industry, machinery, surface heat treatment and welding, boilers, boiling water and other industries, which can replace traditional energy sources.

Electromagnetic heating can improve the efficiency of energy utilization, increase heating speed and improve the accuracy of temperature control.

Sealing of light industry canned goods and other plastic packages, etc.

In the boiler industry, the use of the electromagnetic boiler is characterized by its fast heating speed, which can discard the whole heating method of the traditional boiler and only heat the water outlet end of the boiler, so that the water flow can be heated in the flow, and the heating speed is fast and the space is saved.  

The high frequency electromagnetic heating in the machinery industry can be applied to heat treatment with metal, and its effect is significantly improved compared with traditional treatment methods, such as quenching of various mechanical parts, heat treatment of tempering, annealing and normalizing after quenching, and diathermy before pressure processing;

The application of electromagnetic heating technology is not only conducive to the improvement of product quality, production efficiency, energy saving, cost reduction, but also the technological level of equipment manufacturing enterprises, which is widely accepted and used in traditional industries.  

With the continuous development of science and technology, power saving technologies emerge in endlessly. Electromagnetic heating technology is one of many energy saving technologies. Because of the late development of electromagnetic heating energy saving technology, it is still in its infancy, and many people do not know much about it. Now, the application of electromagnetic heating technology in plastic machinery has been studied carefully, and here is a brief introduction.

Heating is often used in our daily life and production activities. And electric heating is the most common way. In the way of electric heating, resistance wire heating is more common. But resistance wire heating has low thermal efficiency and many other shortcomings. At present, electric heating is widely used in the production of plastic industry, and more than ninety percent uses resistance wire heating mode. This kind of heating mode mainly relies on contact conduction to transmit heat energy, and all kinds of heating plates and rings made of resistance wire have only one surface to contact with the parts needed to be heated, which also causes a large part of heat energy to dissipate in the air.

Energy saving, first of all, we must emphasize that saving can not create new energy. Through the above introduction, we can understand that the potential of saving energy in plastics industry is the energy dissipated in the air. Theoretically speaking, the heat transferred by the traditional heating circle is half the heat, so we say that dissipation is 50% in the air, so the highest electricity saving rate is 50%, but we all know that nothing is possible. It is a perfect state, so it is impossible to have 50%, so we say that under normal circumstances, the electricity saving rate should be around 40%.

At present, the heating method used by plastic machinery in the market is generally heated by the electric heating ring. The heat is transmitted to the material barrel through the contact conduction mode. Only the heat that is close to the inside surface of the barrel can be transmitted to the material cylinder, so that the heat on the outside side is mostly dissipated into the air, which is kept in the heat conduction loss and leads to the rising of the ambient temperature. In addition, the disadvantage of resistance wire heating is that the power density is low, and it can not be adapted to some heating occasions which require high temperature. Electromagnetic heating technology is heating the metal barrel by the principle of electromagnetic induction, and can encapsulate a certain thickness of thermal insulation material outside the barrel according to the specific circumstances. This greatly reduces the heat loss and improves the thermal efficiency, so the power saving effect is very significant, which can reach 30% to 75%. Because the electromagnetic heating ring itself is not heating, and it is made of insulating material and high temperature cable, so there is no problem that the resistance wire of the original electric heating ring is oxidized at high temperature and shortens its service life. It has the advantages of long service life, fast heating rate and no need of maintenance. It reduces the maintenance time and reduces the cost. Now it is widely used by plastic products enterprises, which greatly reduces the production cost of enterprises.

The working principle of electromagnetic heating energy saving products:

Electromagnetic induction heating is a new type of heating system. It breaks the traditional heating mode of the electric heating coil (resistance wire), adopts the most advanced principle of magnetic induction eddy current heating, that is, the current generates magnetic field through the coil. When the magnetic field line in the magnetic field passes through the magnetic metal material, there will be numerous small eddy currents in the metal body, so that the metal material itself will generate heat at high speed and reach the heating gold. Material temperature in the body.

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