| 摘要 |
A direct induction furnace or device for melting a charge held in a cold sheath or shroud with electromagnetic confinement of the conducting portions of the charge. The cold shroud comprises a cylindrical sidewall, which is composed of a plurality of juxtaposed segments in the shape of a hairpin inductor, each formed by two parallel tubular conductors, which are insulated from each other along their entire interface with the exception of a transverse section which electrically and hydraulically connects one end of one of the sections to the adjacent end of the other section. The other ends of these two conductors are, respectively, electrically and hydraulically connected by tubular conductors to two tubular ring-shaped collectors which are respectively electrically connected to two output terminals of a second generator of alternating current of medium or high frequency, in such a way that the alternating currents which thus flow through the cluster of tubular conductors making up the cold shroud, flow alternately in opposite directions so as to generate forces of repulsion at the periphery of the conducting portion of the charge, which is thus kept away from the shroud sidewall, thereby ensuring a supplementary confinement thereof. |
