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    • 2. 发明授权
    • Process for producing low-oxygen iron-base metallic powder
    • 生产低氧铁基金属粉末的方法
    • US4209320A
    • 1980-06-24
    • US942023
    • 1978-09-13
    • Yoshihiro KajinagaMinoru NittaIchio SakuradaShunji Ito
    • Yoshihiro KajinagaMinoru NittaIchio SakuradaShunji Ito
    • B22F9/20C22C33/02B22F9/00
    • C22C33/0235B22F9/20
    • A process for producing low-oxygen iron-base metallic powder are disclosed. The low-oxygen iron-base metallic powder is produced in a shaft-type apparatus comprising a preheating zone and an induction heating zone by alloying and/or admixing iron-base metallic raw powder to be subjected to a final reduction, which has an apparent density corresponding to 16 to 57% of theoretical true density, an oxygen content of not more than 6% by weight and a particle size of not more than 1 mm, with carbon or carbonaceous granule in an amount corresponding to not more than a target alloying carbon content of a final product (% by weight)+ an oxygen content of the powder just before the final reduction (% by weight).times. 1.35 to form a starting powder, preheating the starting powder at a temperature of 780.degree. to 1,200.degree. C. in a non-oxidizing atmosphere having a thermodynamically calculated oxygen partial pressure of not more than 2.1.times.10.sup.-1 mmHg and a dew point of not more than +5.degree. C. in the preheating zone to form a preheated and sintered cake (P-cake) with cylindrically sintered shell layer wherein the volume ratio of the shell layer is at least 20%, induction heating the P-cake at a temperature of 850.degree. to 1,400.degree. C. in the same atmosphere by applying an alternating power of 50 Hz to 500 kHz from power supply to effect deoxidation and decarburization to form an induction heated cake (I-cake), and then cooling and pulverizing the I-cake.
    • 公开了一种生产低氧铁基金属粉末的方法。 低氧铁基金属粉末是通过合金化和/或混合铁基金属原料粉末进行最终还原而形成的预热区域和感应加热区域的轴型设备中生产的,其具有明显的 密度对应于理论真密度的16〜57%,氧含量不超过6重量%,粒径不大于1mm,碳或碳质颗粒的量不大于目标合金化 最终产品的碳含量(重量%)+最终还原前的粉末的氧含量(重量%)×1.35,形成起始粉末,在780〜1200℃的温度下预热起始粉末 在预热区内具有不大于2.1×10-1mmHg的热力学计算的氧分压和不高于+5℃的露点的非氧化性气氛中,以形成预热和烧结的饼(P- 蛋糕) 壳层的体积比至少为20%,通过施加50Hz至500kHz的交流功率,在相同气氛中在850℃至1400℃的温度下感应加热P饼 电源进行脱氧脱碳,形成感应加热饼(I饼),然后冷却粉碎I饼。
    • 3. 发明授权
    • Gas insulated switchgear
    • 气体绝缘开关柜
    • US06560091B1
    • 2003-05-06
    • US09936358
    • 2002-01-14
    • Masahiro TakahoshiKeiichi TsuzuraRyoichi ShinoharaRei HenmiYoriyuki AikoShunji Ito
    • Masahiro TakahoshiKeiichi TsuzuraRyoichi ShinoharaRei HenmiYoriyuki AikoShunji Ito
    • H02B500
    • H02B5/06H02B13/0352
    • In order to shorten the length of connection buses and reduce a cost, in the present invention, a plurality of T-branched circuit breaker units 12 are arranged in a direction perpendicular to the T-branch direction, and the plurality of circuit breaker units 12 are connected by first connection bus units 14 and second connection bus units 15 in series alternately in a rectangular wave shape on a horizontal plane of approximately the same height as the T-branch portions of the circuit breaker units 12. Thereby, first connection buses 5 and second connection buses 6 are stretched around on the horizontal plane of the same height as the T-branch portions of the circuit breaker units 12, but not stretched around in an up and down direction. Therefore, the length of the connection buses can be reduced, and the cost also can be reduced.
    • 为了缩短连接总线的长度并降低成本,在本发明中,多个T分支断路器单元12沿与T分支方向垂直的方向排列,并且多个断路器单元12 通过第一连接总线单元14和第二连接总线单元15在与断路器单元12的T分支部分大致相同的高度的水平面上交替地以矩形波形串联。由此,第一连接总线5 并且第二连接总线6在与断路器单元12的T分支部分相同的高度的水平面上被拉伸,但是在上下方向上不被拉伸。 因此,可以减少连接总线的长度,并且还可以降低成本。