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US 4,947,405 AGranted
DC arc furnace
AssigneeDaidotokushijo Kabushikikaisha
InventorTakeshi Okada
Life of this patent
Estimating the term…
Abstract
An upper electrode is mounted in the upper portion of a furnace and a bottom electrode is mounted in a bottom of the furnace. An electric arc is generated by introducing electric current to the upper and bottom electrodes and the raw materials charged in the furnace is melted. In the process of melting the materials, a mist of cooling water is sprayed by spray nozzles directly against the lower portion of the bottom electrode extruding downwards and the bottom electrode is cooled by the mist.
Claims10
A DC arc furnace comprising:
- (a) a furnace having upper and bottom portions,
- (b) an upper electrode mounted in the upper portion of said furnace,
- (c) a bottom electrode in the shape of a tapered cylinder with an upper smaller diameter and a lower larger diameter mounted in said bottom portion of said furnace, said bottom electrode being extruding, at the lower portion thereof, downward through said bottom, said lower portion having plural ring rising stripes on the outer circumferential surface thereof, and
- (d) spray nozzles arranged in the surroundings of said lower portion for spraying a mist of cooling water against said lower portion.
1 more element
Dependencies are inferred from the claim text.