CH99868A

CH99868A - Connection device between a mobile electrode of a high-power electric furnace and the source of electrical energy supplying the furnace.

Info

Publication number: CH99868A
Authority: CH
Inventors: Friderich Louis
Original assignee: Friderich Louis
Priority date: 1922-06-13
Filing date: 1922-06-13
Publication date: 1923-07-16

Description

Dispositif de connegion entre une electrode mobile de Tour electrique de grande puissance et la source d'energie electrique alimentant 1e four. Lobjet de 1'invention est -an dispositif de connexion entre une electrode mobile de four electrique de grande puissance et la source d'energie electrique alimentant 1e four. Connection device between a mobile electrode of a high-power electric tower and the source of electrical energy supplying the furnace. The object of the invention is a connection device between a mobile electrode of a high-power electric furnace and the source of electrical energy supplying the first furnace.

Dune fagon tres generale los electrodes mobiles des fours electriques de grande puis- sance sont reliees aux sources d'energie elec- trique alimentant les fours, ä, des transforma- teurs par exemple, Partie par des Barres fixes, Partie par des lames flexibles ou des cäbles destines .ä permettre 1e mouvement des elec- trades au fur et ü mesure de 1'usure de celles- ci. Ce dispositif de -connexion presente,divers inconvenients. Dans 1e cas de fours triphases en particulier il a 1'ineonvenient de reculer au delä des lames flexibles ou des cäbles, par rapport aux fours, la possibilite de "sand- wicher" les,conducteurs d'amenee du courant, c'est-ä-dire de disposer aussi pres quo possible los conducteurs de polarite differente de fagon ä reduire la self-induction du systeme consti- tu6 par ces conducteurs: 1e coeffieient d'in- duction d'un four est donc d',autant plus grand quo los longueurs de conducteurs non "s,.nd- twiches" sont plus grandes. Dans los fours de Faible puissance an a pu supprimer los lämes flexibles ou los cäbles et los remplacer par des dispositifs de connexion comportant deüx .contacts metalliques glissant 1'un sur 1'autre au cours du deplacement de 1'electrode. De tels dispositifs, par contre, ont ete inutilisables jusqu'ici dans los fours de grande puissance: les contacts metalliques ont en effet 1'inconvenient de se eiquer tres fai- blement, lorsque par suite d'un serrage inegal de leurs deux faces en contact, 1e courant prend accidentellement en certains points une densite excessive ou lorsque - ce qui arrive frequemment - un .arc, meme d'intensite Faible, s'amorce entre @certains points de ces deux surfaces; an sait quo 1e metal ayant subi 1'action d'un arc prend en general une tres gründe durete et quo los bavures produites ainsi empechent bientöt tout glissement des deux surfaces l'une sur 1'autre. In a very general way, the mobile electrodes of high-power electric furnaces are connected to the sources of electrical energy supplying the furnaces, to transformers for example, Partly by fixed bars, Partly by flexible blades or cables intended to allow the movement of the electrodes as they wear. This -connection device presents various drawbacks. In the case of three-phase ovens in particular, it is inconvenient to move back beyond the flexible strips or the cables, with respect to the ovens, the possibility of "sandwiching" the current supply conductors, i.e. that is to say, to arrange as nearly as possible the conductors of different polarity so as to reduce the self-induction of the system constituted by these conductors: the induction coefficient of a furnace is therefore all the greater quo los lengths of non "s,.nd-twiches" conductors are greater. In low power furnaces, it has been possible to eliminate the flexible blades or the cables and replace them with connection devices comprising two metal contacts sliding one over the other during the displacement of the electrode. Such devices, on the other hand, have hitherto been unusable in high-power furnaces: the metal contacts have the inconvenience of icting very slightly when, as a result of unequal tightening of their two faces contact, the current accidentally takes on an excessive density at certain points or when - which happens frequently - an arc, even of weak intensity, begins between @ certain points of these two surfaces; It is known that the metal having undergone the action of an arc generally takes on a very great hardness and that the burrs thus produced soon prevent any sliding of the two surfaces one on the other.

Ces divers inconvenients sont evites selon 1'invention gräte au Fait quo los faces en Prise des contacts sont constituees par du carbone. These various disadvantages are avoided according to the invention thanks to the fact that the contact engagement faces are made of carbon.

Le dessin annexe represente ä titre d'exem- ples deux formes d'execution du dispositif. La fig. I est une eoupe vertieale d'un four auquel une Premiere forme d'execution est appliquee; La fig. II est une coupe verticale d'un four auquel la seconde forme d'execution est ,. ppliquee; Les fig. III et IV sont des coupes ver- tieale et horizontale de c.ette seconde forme d'execution. The appended drawing shows, by way of example, two embodiments of the device. fig. I is a vertical section of a furnace to which a first form of execution is applied; fig. II is a vertical section of an oven in which the second form of execution is ,. applied; Figs. III and IV are vertical and horizontal sections of this second embodiment.

Le courant est amene par des Barres me- talliques (fig. I) A et C ä l'61ectrode verticale E qui plonge da.ns 1a. cuve F du Tour, dont il Part dune fagon que 1e dessin ne montre pas; 1e dispositif de Suspension de 1'eleetrode n'est pas represente non plus. The current is carried by metal bars (fig. I) A and C to the vertical electrode E which plunges into 1a. tank F du Tour, from which it starts in a way that the drawing does not show; the suspension device of the eleetrode is also not shown.

Entre les Barres A et C est interealee la Premiere forme d'execution du tdispositif, dort 1'un des eontacts, M, est fixe et est relie ä la Barre A, tandis que 1'autre, c'-d', mobile, est connecte 'a 1a Barre C. Chacun des deux con- taets comporte une monture c ou c' en metal par exemple, et une garniture l ou d' en gra- phite; ils sont en Prise 1'un avec 1'autre par leurs garnitures 1, d' et sont maintenus ainsi par des ressorts R, R' qui participent aux mouv ements verticaux de l'61ectrode E. Between Bars A and C is inserted the first form of execution of the device, one of the contacts, M, is fixed and is connected to Bar A, while the other, that is, mobile, is connected to the Bar C. Each of the two contacts comprises a mounting c or c' in metal for example, and a trim l or d' in graphite; they are engaged with each other by their linings 1, d and are thus maintained by springs R, R' which participate in the vertical movements of the electrode E.

Dans la seconde forme d'execution (fig. II b IV) le courant a.rrive par deux Barres me- ialliques A. A' ä deux contacts fixes verti- eaux 31 situes ä une certaine distance 1'un de 1'autre; ils comprennent ehacun une Barre me- diane metallique, en .cuivre par exemple, ä la quelle la. Barre A ou A' correspondante est reliee et deux garnitures laterales l ou Z' ou 1." en graphite. De Part et d'autre de chaque contaet fixeIN se trouve un contact mobile eomprenant la Barre conductrice C ou C' ou C,", en cuivre par exemple, reliee ä l'61ectrode E et une ou deux garnitures d ou d' ou d" en graphite. Les divers contacts fixes et mo biles sont en Prise les uns avec les autres par leurs garnitures et sont maintenus en Prise par les ressorts R, P' qui parti.cipent aux mou- v ements de 1'eleetrode E. In the second form of execution (fig. II b IV) the current arrives via two metal bars A. A' at two vertical fixed contacts 31 located at a certain distance from each other; they each include a metal median bar, in .copper for example, to which the. Corresponding bar A or A' is connected and two side gaskets l or Z' or 1." in graphite. On either side of each fixed contactIN there is a movable contact comprising the conductive bar C or C' or C," in copper for example, connected to the electrode E and one or two gaskets d or d' or d" graphite The various fixed and movable contacts are in engagement with each other by their gaskets and are maintained in engagement by the springs R, P' which take part in the movements. elements of the electrode E.

La garniture des contacts peut etre en eharbon graphite. La. plus gründe Partie de la masse de eeux-ei peut etre en metal, alors que seules leurs faces en contaet sont en gra- phite ou en charbon graphite. The contact lining may be graphite charcoal. The largest part of the mass of them may be metal, while only their contact faces are graphite or graphite carbon.

Claims

CLAIM Connection device between a mobile electrode of a high power electric furnace and the source of electrical energy which supplies the furnace, established in such a way as to allow the displacement of the electrode without the aid of flexible blades or cables . thanks to the fact that it comprises two contacts which slide over one another during this movement, characterized in that RTI ID="0002.0271" WI="6" HE="4" LX="1331" LY="1209"> that the contact faces are made of carbon. SUB-CLAIMS 1 Connection device according to claim characterized in that the carbon of the faces of the contacts is in the form of graphite.

2 Connection device according to claim, characterized in that the carbon of the faces of the contacts is in the form of graphite carbon.