Mechanical Structure Of High Frequency Induction Heater Coil

The basic components of the induction heating system include induction heating power supply, induction coil (sensor) and the workpiece to be heated. Today we will explain the mechanical structure of the induction coil in detail. The basic requirements for the through-heating induction coil are tight coupling with the workpiece under full and no-load conditions, satisfactory adiabatic and electrical insulation, and sufficient rigidity. Because the induction coil is working in a harsh environment, but also must have a high reliability, so the induction coil must be carefully designed. Most induction coil design work is carried out in combination with the operating device and matching parts such as transformers, capacitors, etc. After the main parameters have been determined, the arrangement of the induction ring must take into account the effects of the water cooling system, vibration and magnetic field leakage.

Copper with high conductivity is always used as a conductor material, and the induction rings are made of hollow copper tubes with water cooling. Small heaters can be made of copper wire covered with nylon or PVC plastic in a fluidized bed and then poured in refractory cement. A water-cooled stainless steel guide covered with a hard tungsten-chromium-cobalt coating is passed axially along the induction ring through the air gap to prevent the workpiece from wearing the refractory cement on the induction ring. Although this structure is simple, inexpensive and durable, it does not have the best insulation and insulation properties. Concrete is vulnerable to cracks due to acute cooling and heat, so when the induction ring reaches its expected life and needs to be redecorated, it is difficult to repair without damaging the coil.

At the power supply frequency, the thickness of the coil conductor is usually 12 mm, and it should be remembered that at the frequency of 50/60 Hz, the depth of the current layer of cold copper is 10 chamber meters. Therefore, the induction ring is made of pipe or square water pipe (D-section) made of integral extruded shape. In the past, the composite conductor was made by brazing square conductors and cooling water pipes with silver solder, which was not only expensive but also less feasible than monolithic pipes. A large lathe is used to wrap the induction coil around a mandrel, after forming, the induction is cleaned and ready for insulation.

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