When the magnetic flux surrounded by the conductor loop changes, an induced potential is generated in the loop. Similarly, the conductor in the alternating magnetic field is induced by the electromagnetic induction to generate an induced current, and an induced current is formed in the conductor. ), the induced current overcomes the resistance of the conductor itself to generate Joule heat, and the heat is used to heat the conductor itself to heat and melt it, thereby achieving various heat processing purposes, which is the principle of medium frequency induction heating.
Medium frequency induction heating advantagesFast heating
Less oxidative decarburization The principle of medium frequency induction heating is electromagnetic induction, and the heat is generated in the workpiece itself. Since the heating method has a fast heating rate, the oxidation is extremely small, the heating efficiency is high, and the process repeatability is good.
Evenly heated
The temperature control precision is high, and the induction heating is easy to achieve uniform heating and small temperature difference of the core meter. The temperature control system enables precise control of temperature. Compared with other heating methods, low-energy and pollution-free induction heating has high heating efficiency, low energy consumption and no pollution; all indicators can meet user requirements. Under diathermic conditions, the power consumption from room temperature to 1100 ° C is less than 360.
The relationship between the induction heating coil and the object to be heated (metal) is the same as the relationship between the primary side and secondary side coils of the transformer. The magnetic lines of force generated by the heating coil through the high-frequency current are concentrated on the object to be heated, and electromagnetically induced to generate a vortex current to heat the object to be heated. At this time, depending on the type and shape of the steel, the frequency, power, heating time, holding time, and shape of the coil of the appropriate alternating current can be selected to obtain appropriate quality characteristics for various steel materials.
Medium frequency induction heating application1. Before the forging, hot extrusion, hot rolling, blue brittle cutting and other billet heat.
2. Heat treatment, including quenching and tempering of parts.
3. Brazing
4. Melting black, colored and rare metals
5. High temperature sintering of refractory metals such as tungsten and molybdenum, powder metallurgy, etc.
6. Stable power supply for drawing monocrystalline silicon.
IF induction heating power supply worksAccording to the electrician principle, the conductor in the alternating magnetic field generates an induced electromotive force, and the eddy current is caused to cause the conductor material to generate heat. The IF induction heating power supply is a device that converts three-phase power frequency (50 HZ) AC power into single-phase IF AC power. The series resonance of the intermediate frequency induction heating power supply, that is, the voltage type resonance frequency tracking. Therefore, the efficiency is higher and the power factor is higher. Therefore, there is a significant power saving effect, heating 341 degrees per ton of bar material.
At present, the working principle of the medium frequency induction heating power supply with more applications is to first rectify the three-phase alternating current into an adjustable direct current through a rectifying circuit, and after being filtered by the reactor, the inverter converts into a higher frequency alternating current supply load. The intermediate frequency induction heating power supply is uncontrollable full-bridge rectification. It does not cause waveform distortion in the rectifier section, there is no clipping phenomenon of the turn-off angle, and it is filtered by large capacitors. Therefore, the small harmonics have little interference to the power grid.
With the rapid development of China's industrialization process, the field of induction heating is also developing rapidly. Due to environmental protection requirements and coal price, coking coal heating not only does not meet environmental protection requirements, but also is very uneconomical in terms of price and economy. On the one hand, industrial heating also uses a large number of medium frequency heating equipment with KGBS as the main component of thyristor. The power factor is low and consumes a lot of electric energy. With the financial crisis, energy saving and cost reduction have become very urgent for SMEs. The problem, so we have used nearly 20 years of induction heating experience to successfully develop the JZ (IGBT) series of energy-saving IF.
Medium frequency induction heating power supply features1. Constant power output to ensure 100% utilization of power transformer capacity.
2 The power factor is always greater than 0 96, no high-order harmonic interference, no pollution to the power grid.
3 Digital phase lock technology is adopted, and the frequency stability is high.
4 has multiple protection features.
5 Advanced multi-frequency preset technology with 100% successful start-up rate.
6 Use a fully enclosed internal circulation water cooling system to ensure equipment safety.
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