Direct current arc furnace
AssigneesNKK Corporation, Tokyo Steel M.F.G. Co., Ltd.
InventorsToshimichi Maki, Hiroyuki Yamashita, Yoshimi Kawazu, Hidefumi Nakashima
Life of this patent
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Abstract
A DC arc furnace according to the invention has a bottom electrode, which comprises a plurality of contact pins each having an end to be brought into contact with an object and to supply arc-forming current thereto, a current base electrically connected to the other end of each of the contact pins for distributing current from a power supply to the contact pins, and a cooling device for cooling the current base with the use of cooling water.
Claims15
A DC arc furnace for melting an object with the use of the heat of arc generated between a bottom electrode and an upper electrode, the bottom electrode comprising:
- a plurality of contact pins each contact pin having an end to be brought into contact with the object and to supply an arc-forming current thereto, wherein the number of said plurality of contact pins falls within a range of 200-300;
- a current base electrically connected to another end of each of the contact pins for distributing current from a power supply to the contact pins;
- a coolant passage attached to the current base for performing heat exchange with the current base for cooling the current base;
- a coolant supply source for supplying said coolant passage with cooling water as a coolant;
- and
- an exhausting device for exhausting the cooling water in the coolant passage.
A DC arc furnace for melting an object with the use of the heat of an arc generated between a bottom electrode and an upper electrode, the bottom electrode comprising:
- a plurality of contact pins, each contact pin having an end to be brought into contact with the object and to supply arc-forming current thereto;
- a current base electrically connected to another end of each of the contact pins for distributing current from a power supply to the contact pins, the current base comprising a steel plate having a thickness of at least 90 mm;
- cooling means for cooling the current base;
- and
- a solid terminal attached to a lower portion of the current base for supplying said plurality of contact pins with DC current.
A DC arc furnace for melting an object with the use of the heat of an arc generated between a bottom electrode and an upper electrode, the bottom electrode comprising:
- a plurality of contact pins, each contact pin having an end to be brought into contact with the object and to supply arc-forming current thereto;
- a current base electrically connected to another end of each of the contact pins for distributing current from a power supply to the contact pins;
- cooling means for cooling the current base;
- and
- wherein the current base comprises a steel plate having a thickness of at least 90 mm.
A DC arc furnace for melting an object with the use of the heat of an arc generated between a bottom electrode and an upper electrode, the bottom electrode comprising:
- a plurality of contact pins, each contact pin having an end to be brought into contact with the object and to supply arc-forming current thereto;
- a current base electrically connected to another end of each of the contact pins for distributing current from a power supply to the contact pins;
- cooling means for cooling the current base;
- wherein the number of said plurality of contact pins falls within a range of 200-300.
A DC arc furnace for melting an object with the use of the heat of an arc generated between a bottom electrode and an upper electrode, the bottom electrode comprising:
- a plurality of contact pins, each contact pin having an end to be brought into contact with the object and to supply arc-forming current thereto, wherein the number of said plurality of contact pins falls within the range of 200-300;
- a current base electrically connected to another end of each of the contact pins for distributing current from a power supply to the contact pins;
- cooling means for cooling the current base;
- and
- a solid terminal attached to a lower portion of the current base for supplying said plurality of contact pins with DC current.
Dependencies are inferred from the claim text.