US980781A

US980781A - Electric melting-furnace.

Info

Publication number: US980781A
Application number: US51001909A
Authority: US
Inventors: Karl Albert Fredrik Hiorth
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-07-28
Filing date: 1909-07-28
Publication date: 1911-01-03
Anticipated expiration: 1928-01-03

Description

K. A. 1". 1110111111. ELECTRIC MBLTING FURNACE. APPLICATION FILED JULY 28,1909.

Patnted Jan.3, 1911.

. Inventor. 112 /12 41%: am M Witnesses.

UNITED STATES KARL ALBERT FREDRIK .HIORTH, 0F CHRISTIANIA, NORWAY,

ELECTRIC MELTING-FUENACE.

Specification of Letters Patent.

Patented Application filed July 28, 2993. Serial llo. filthfilfi.

To all whom it may concern:

Be it known that I, KARL ALBERT FRED- RIK llion'rn, a subject of the King of Norway, residing at Christiania, Norway, have invented certain new and useful lmprovements in Electric Melting-Furnaces; and I do hereby declare the following to be full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to malreand use the same. reference being had to the accompanying drawings, and to letters or figures reference marked thereon, which form a part of this specification.

This invention relates to electric melting furnaces, more particularly of the induction furnace type, with magnet and primary arranged in any manner previwindings ously known, winch furnace is character" ized by the arrangement ofv the secondary winding or the secondary windings-each of which consists of two main parts forming a circuit, and one of which incloses the magnet and has a comparatively large cross section respectively low resistance and which may preferably be largely divided, so-thatthis part obtains a temperature correspondingly lower, the other part consisting of the melting bath being located outside the frame of the magnet and being connected in series with the former part. This second part-of the secondary. conductor or conductors has a comparatively small cross section respec tively a considerably greater resistance and correspondingly higher temperature than the former part of the secondary winding which, ,as indicated above, consists of one single conductor or preferably of several conductors connected in parallel and Wound onto the magnet, and the ends of which meet in the bath at opposite ends of the same.

In the accompanying drawingz Figure 1 is a diagrammatic view of a melting furnace embodying my invention and Fig. 2 is a detail view of the furnace showing the relationof the conductors to the bath. I

A is the transformer, B the melting chamher or. furnace properp The transformer,v

which can have any form, and, for instance,

may be made as'a disk, shell or core trans former-single phase or, .multi phase-is rovided,as usual, with a primarv winding g, with or without cooling, whi e the sec ondary winding S is divided into}; renter number of sections which,by way of t e conductors C, the ends of which extend through entinvention the advantage the melting chamber or chamb located entirely outside the transformer, that the several parts of the same will not be surrounded by melted material It also affords the possibility of giving ing chamber the most advantageous form in metallurgical as well as in electrical respect, thereby enabling a rational treatment oi the slag as well as repairs'ot the furnace dar ing the Work to befi'ected; the arranfleia also readily admits of so adapting tale fornace that it can be tipped independently of the transformeiu Greater losses by ing are avoided, because masonry does not here intervene bet-ween windings and rna,. net, and the magnet can be utilised ration ally all around, while losses through shin effect are avoided, and likewise pinch effect virtually excluded. By arran mg the ends of the secondary windings at ifierentheight in the melting chamber the sla or the metal can be more strongly heated at -leasure, this being controlled for instance y a switch suitably arranged,

Claims:

1. The combination with an electric for mice; of a transformer having primary and secondary windings, said secondary wind ings of large cross section and subdivided and of large cross section. and subdivide to reduce their temperature; of ele furnace to which said secondai" Wifit" gs are connected at different levels located to the melt to reduce their temperature and connected closely surrounding the primary windings outside of the magnet frame' of the transformer, the bath of which furnace connects the ends of the secondary windings and is of lessvcross section than the secondary windings supplying current thereto.

3. The combination with a transformer having primary windings connected in series and subdivided secondary windings of large cross-section closely surrounding the primary windin s and having ends made of the same kind 0% metal as that to be melted; of an electric melting furnace to which the ends KARL ALBERT FREDBIK HIORTH.

\Vitnesses HENRY Bommwion, M. ALGER.