Description of induction coil structure of intermediate frequency furnace

The induction coil of the intermediate frequency furnace is made of a rectangular thick-walled copper tube on a special mold. There is no joint in the middle. The two ends are pure copper argon arc welding. The copper tube is made of high-quality cold-extruded copper tube made of T2 (99.9%). There should be no welding seam inside the induction coil.

The induction coil is fixed by a series of bolts and insulating stays welded on its outer circumference. The coil is compressed by an adjustable stainless steel screw.

After the coil is fixed, the error of its turn pitch is not more than 2mm. After 24 hours of hydraulic test at 3 times the working pressure, after confirming that there is no leakage, the appearance of the induction coil is wrapped with high-strength mica tape, dipped in an insulating paint tank for 16 hours, and then dried for 16 hours. Repeat this twice to ensure The insulation grade is H grade, and the withstand voltage is greater than 5000V.

Before the coil is assembled, after 24 hours 3 times the working pressure water pressure test and 7000V withstand voltage test, it can be transferred to the next process after it is confirmed to be qualified.

Stainless steel water-cooled rings are arranged on the upper and lower parts of the induction coil of the intermediate frequency furnace, the purpose of which is to uniformly heat the furnace lining material in the axial direction and prolong the service life of the furnace lining. Lafadie short-circuit rings are arranged on the upper and lower parts of the induction coil to fully absorb the magnetic leakage at the upper and lower ends and prevent the section of the furnace from heating. The wiring adopts the side lead wire to reduce the torque of the large cross-section water-cooled cable when the furnace is tilted.

On the outer surface of the induction coil, several temperature probe fixing seats are welded in sections according to the water circuit for installing temperature measuring elements. The working temperature of the induction coil of the intermediate frequency furnace can be displayed on the graphic display of the intermediate frequency power supply.

The inner side of the coil is evenly smeared with refractory mortar (American Union Minerals) with a thickness of 15-25mm to ensure good heat insulation and buffering and insulation, which facilitates the pushing of the old furnace lining and the lining of the furnace lining, and prevents the service life of the working furnace lining from being affected by cold and heat deformation

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