US1069252A - Electric furnace. - Google Patents

Description

A. HELFENSTEIN.

ELEGTRIO PUBNAGE. APPLIOATION rILBD'jUNE 5, 1912.

Patented Aug. 5, 1913,

Ji -rtl- UNITED smms P T T OFFICE ALOIS HELIENSTEI, or vmnmnusrma-nunaa.

fspeofleation a: Letters mm. i

i Patented Aug. 5,1913.

Application fil ed June 5,1912. Serial Ne. 761392, I

To alt whom it may sondern.-

Be it known that I, ALOS HLFENsTEIm a citizen of Switzer1and,and-a residentof Vienna, Austria-Hungary, have invented new and useful lmp'ovements in Electric urnmes, of which the following s a specfication.

endary circuit formed as in the Kjellin heaters of the single windng type, but as distinguished from these the i'nduced sec-,

ondary is placed outside the metal bath suitably also outside the heater.

tilineal for example. Hereby the heater is made very largely independent of the rest of the transformer elements.

The 'furnace may be constructed as a' tube u accessible throughout, so that the heating process can be easily overlooked and controlled.'- In consequence of the simple straight form of the furnace cold charges 'can be easily melted down. The furnace chamber is of such dimensions that heating with fuel, can be efl'ected together with that by induction. These. dimensions, particularly in the case of tubular furnaces, present the further advantage th'at the furnacelining is better utilized as by the im le turning of the tube a fresh length of linng can be introduced as bed' for the bath. For this purpose* the furnace is of course constructed so that it will turn, whereby the bath can be moved mechanically during the working without disturbingior moving the other parts of the transformer arrange ment. I

The stran on the furnace lining in the present heater is uniform, the. furnace lining itself is cooled from outside on all sides by the natural movement of the air. The surface of the metal bath, on which if necessary purfying additional substances are' caused to act, may be large, while the depth of the bed should be suitably slight, whereby a quicker and more intense action o the refining substances is eflected. V

In the drawing the invention is illus- The present inventiontconsists 'in the sec-.

agim. as employed wasng and nvisibl phase current, Figure 1 beings -transverse section, Fig. 2 ,a longitudinal section .partly in .elevation of a. single-phase-inductio furnace Fig. 3an induction' furnaee'in the secondary ci'cuit ofwhich two lerig hs or; sectmnsjare formed, Eg. 4is v natic .representaton nha trphaseanduc tion furnce, in which thi-iee metal bands 'of the diflferenttphases lformlone band,

Fign 5 a' speciallyfayoramearrangement; of; the fixed zseeondary i winding and %i he primary winding inrelatjon to `the i In 'theembodiment ofthe inven-tion here i illustrated thene is provided ;ai .tubnlar conetainer l which is -surrounded by: hearing rings 1' which; are supported en wing bear ings 1 se !that thetube may .be involved about its axis in anyof the well lnum-.nu-`

ners. ,This tube forms the iumaee proper and will. be here-inafter referred to'as the container. The tube 1 is lined with suitablenon-.conducting refractory material l and at its ends'is provided with trunnions 1" having suitable openings therethrough for the passage of the charge, fuel gases, and the like. One of these trunnions is located at the charging-end of the furnace and may, where desired; be placed in communication with a suitable fuel burner 1. The other trunnion' communicates with a flue 1' in order to provide for the escape of the waste gases; I i v The whole device is supported over 'a pit 8 .provided with suitable walls 9 ,forming the foundation and whereon rests `the bearings 1. Forming a part of the inner wall-of the container at each end and at such intermediate points as may be found advisable, are conductor rings 10 'provided with flanges 11 which extend annularly around the tube 1. In the pit 1 are a plurality of buttresses 12 whereon are' mounted 'the transformer cores 7 around which runs the primary winding 6 supplied from any suitable source of electricity as, for instance, the line wires 6'. Extending from end to end beneath the container and between the upper and lower windings 6 isa oopper band 4 which'forins the exterior portion of the secondary circuit. At each of the flanges 11 this band 'branches Upward as at 4:' and on' the extremity of each of these upturned portions is' provided a pair of brushes 4:" which enbrace the respective flange and form elec- 4 trical connection therewith'l v The secondary circui-t is completed from one of the rings 10 to the other by 'means of the metal bath 3,

'which owing to its high resistanpe becomes intesely heated on passage of the current.

It 'will be noted that while difl`erent arrangements of the transformers and connections are shown in Figs. 2 and 3 and 4 the principle remains the same in each case. It is further pointed out that these induction furnaces through the employment of a large number of primary coils facilitate the regulating of the secondary circut, which is very difficult with other induction furnaces in the course of working.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. In a furnace of the kind described; a container consisting of a furnace provided with a metal receiving chamber, a transformer core located 'entirely beneath said container, a primary windin surrounding' said core, and a secondary winding passing adjacent said prmary winding and arranged -for connection with the interior of said container, said secondary winding lying wholly beneath said contaner.

2. In an electrc furnace; a contaner consisting of a furnace provided with a metal 'on the 'ends of said secondary winding in contact with said flanges.

3. In an electric furnace, a revolubly mounted tubular container consisting of a furnace provided with a metal receiving chamber, spaced conductor rings carried by v said container and forming part of the interior wall thereof, a fiange on each of said rings projecting annularly from the exte'ior of said container, a transformer core adjacent said container, a primary Winding on said core, a secondary winding for 'said core, and brushes on the secondary winding and engaging said flanges whereby electrical contact is maintained at all times between said secondary wnding and the conductor rings.

In testimony whereof I affix my signature in presence of two witnesses.

ALOIS HELFENSTEIN. Witnesses:

AUGUBT FUGGER, IGNAZ KNORSCHMACHER.

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