| 摘要 |
1,067,326. Induction furnaces. O. JUNKER. June 19, 1964 [June 20, 1963], No. 25404/64. Heading H5H. [Also in Division F4] The fluid-cooled hollow coil 17 surrounding a coreless vacuum induction furnace (see Division F3-F4) is supported at its lower end by the bottom legs of twelve C-yokes 24 composed of laminar lacquer coated transformer sheet-metal, which surround the coil in an evenly spaced manner. Electromagnetic forces occurring during operation of the coil are taken up by spring- loaded anchor bolts 30 attached to each of the C-yokes 24 and provided with fingers 30a which press against the upper portion of the coil. The coil 17 is separated from the bottom leg of the C-yokes 24 and from the finger 30a by an insulation layer 29, from the gas-tight sleeve 13 surrounding the furnace by a layer of selfhardening resin 27 poured therebetween, and from the middle section of the C-yokes 24 by a layer 28 of mica, asbestos or fireproof felt. To reduce stray field losses generated by the coil 17 magnetic yokes 10 associated with each of the C-yokes 24 are embedded in the refractory bottom of the furnace immediately above a highly conductive copper layer 11 which shields from the stray field the bottom closure plate 9 of the furnace. |
