GB170046A - Improvements in and relating to induction furnaces having unidirectional circulation - Google Patents

Abstract

170,046. Wyatt, J. R. June 9, 1920. Induction furnaces.-In a furnace having a narrow channel which opens at its ends into a pool of molten metal and surrounds one limb of an iron core, one end of the channel is arranged to produce electrodynamic flow of the molten metal. Fig. 1 shows a channel narrow at one end 25<1> and widening towards the other end. The core may be displaced from the centre of the intermediate refractory mass 36 towards the narrow part of the channel and optionally downwards. Unidirectional circulation is produced in consequence of the sharp angle at one end, the obtuse angle at the other end, and the tapering form of the channel. A groove 24 in the bottom of the main chamber connects the ends of the channel. In another form of furnace, a section of which is shown in Fig. 7, the channel is branched so that electrodynamic action at the dividing angle produces circulation, which is increased by forming a sharp angle at one end and an obtuse angle at the other end of the channel. The core mav be eccentric and circulation may also be increased or diminished by tapering the channel. In making either of the above forms of furnace, asbestos paste may be rammed around a destructible core, having the shape of the channel, and between an outer insulating-band 29, Fig. 1, and inner band 30 around the primary winding. The iron core 15, 16 is held by angle irons 19. Parts of the casing are held together by bolts and brackets.