DEVICE FOR COMBINED ELECTRICAL PROCESS BASED ON SERIAL VOLTAGE INVERTERS

摘要

FIELD: electricity. ^ SUBSTANCE: proposed invention relates to induction heating equipment and may be used for simultaneous metal melting and cup drying during reconstructive maintenance of induction-smelting furnaces. According to the invention the device includes three-phase three-coil low-frequency mains transformer, two three-phase diode bridge rectifiers, one filtering choke and one filtering condenser, two single-phase serial voltage inverters with back connection diodes and two induction-smelting furnaces with serial-connected compensating condensers. Besides the primary coil of three-phase three-coil transformer is coupled with three-phase a.c. network and two secondary coils are connected with a.c. terminals of serial-connected three-phase bridge rectifiers. Two parallel connected serial voltage inverters also connected to the bridge rectifiers through filtering choke and filtering condenser. The first induction-smelting furnace for metal smelting is coupled with output a.c. terminals of the first inverter. The novelty of the invention is the additional single-phase high-frequency transformer with the first coil being connected to the output a.c. terminals of the second serial voltage inverter and the second coil being connected to the second induction-smelting furnace for cup drying. Metal is melted in the first induction smelting furnace when supply voltage from a.c. mains and control pulses to serial inverters valves is supplied. Cup is dried out in the second induction-smelting furnace when no shortcuts to the ground are available and no additional equipment is present, which ensure the claimed technical result. ^ EFFECT: improvement of smelting equipment reliability and reduction of specific rated capacity. ^ 1 dwg