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一.基本案情:1985年9月5日,原告太原重型机器厂向我国专利局申请“磁镜式直流电弧炉”实用新型专利,1986年8月22日授予实用新型专利权。该专利的发明目的是解决已有的直流电弧炼钢炉的偏弧问题。在原告专利的独立专利要求的前序部分记载的是已有直流电弧炉的电气、机械的必要技术构成,在特征部分记载的是磁镜线圈及其连接方式。按照专利说明对该技术方案的解释,在两根石墨电极的直流电弧炉中,两根石墨电极与钢水之间形成的两个离子电弧因相互排斥,导致严重的偏弧,在炉体上安装一个或两个磁镜线圈,该线圈产生一个磁场,该磁场使电弧受到约束、箍缩而垂直向下,有效地解决了直流电弧的偏吹问题。
I. Basic facts: On September 5, 1985, the plaintiff Taiyuan Heavy Machinery Factory applied to our Patent Office for utility model patent of “Magnetron DC Arc Furnace” and granted utility model patent on August 22, The purpose of this patent is to solve the problem of arcing of the existing DC arc furnace. In the preamble to the independent patent claim of the plaintiff patent, the necessary electrical and mechanical technical configurations of the conventional DC electric arc furnace are described, and in the characteristic part, the magnetic mirror coil and the connection method thereof are described. According to the patent description of the technical solutions, two graphite electrodes in the DC arc furnace, two graphite electrodes and molten steel formed between the two ion arc due to mutual exclusion, leading to a serious partial arc, the furnace installed One or two magnet coils produce a magnetic field that constrains the arc and pinches down vertically to effectively solve the deflection problem of the DC arc.