Induction heating furnace and bottom tapping mechanism thereof
AssigneeShinko Electric Co., Ltd.
InventorsMasanori Tsuda, Atsushi Okuno, Yasuhiro Nakai
Life of this patent
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Abstract
An induction heating furnace includes a furnace body having a side wall extending so obliquely as to increase in radius from the bottom to the top edge portion and formed by a plurality of longitudinally split, conductive segments arrayed circumferentially and insulated from each other, a first induction heating coil arranged at an outer periphery of the side wall for subjecting a to-be-heated material accommodated in the furnace body to induction heating and a melt-use power source for supplying AC power to the first induction heating coil.
Claims3
A bottom tapping mechanism in an induction heating furnace, including:
- a tapping portion located at a bottom of an accommodating vessel for accommodating therein a molten material, and being divided into a plurality of segments by a plurality of slits which are continuous to each other and connected to cooling water feed and discharge pipes;
- induction heating coils arranged around said tapping portion;
- and
- a solidification-use power source portion and a melt-use power source portion connected to said induction heating coils,
- wherein said solidification-use power source portion produces a low-frequency power having a value selected for inducing eddy currents at a deep layer from the surface of the molten material so as to close the tapping portion by solidification of the molten material, and
- said melt-use power source portion produces a high-frequency power having a value selected for inducing eddy currents at a thin layer from the surface of the molten material so as to open the tapping portion by melting of the molten material.
Dependencies are inferred from the claim text.