EP0010305B1 - Liquid-cooled support for the head of an electrode - Google Patents

Liquid-cooled support for the head of an electrode Download PDF

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Publication number
EP0010305B1
EP0010305B1 EP79104036A EP79104036A EP0010305B1 EP 0010305 B1 EP0010305 B1 EP 0010305B1 EP 79104036 A EP79104036 A EP 79104036A EP 79104036 A EP79104036 A EP 79104036A EP 0010305 B1 EP0010305 B1 EP 0010305B1
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EP
European Patent Office
Prior art keywords
fluid
holder according
cooled
cooled holder
electrode
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Expired
Application number
EP79104036A
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German (de)
French (fr)
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EP0010305A1 (en
Inventor
Emil Dr.-Ing. Elsner
Rudolf Dr.-Ing. Kasper
William Ernst Dr.-Ing. Schwabe
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Primetals Technologies Germany GmbH
Original Assignee
Fuchs Systemtechnik GmbH
Korf and Fuchs Systemtechnik GmbH
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Application filed by Fuchs Systemtechnik GmbH, Korf and Fuchs Systemtechnik GmbH filed Critical Fuchs Systemtechnik GmbH
Priority to AT79104036T priority Critical patent/ATE43T1/en
Publication of EP0010305A1 publication Critical patent/EP0010305A1/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H05B7/101—Mountings, supports or terminals at head of electrode, i.e. at the end remote from the arc

Definitions

  • the invention relates to a liquid-cooled holder for the tip of an electrode of an arc melting furnace according to the preamble of patent claim 1.
  • Liquid-cooled holders of this type which form the upper part of an arc electrode with an edible or non-edible electrode tip, have become known, for example, from DE-A-1 565 207.
  • a tubular heat shield made of very heat-resistant material, such as ceramic, surrounding the cooling system is provided.
  • ceramic covering it can be provided with a wire insert.
  • the aim of the invention is a liquid-cooled holder of the type mentioned in the introduction for an electrode tip which, with a surprisingly simple structure, not only ensures the desired thermal shielding of the metallic cooling system from the furnace atmosphere, but also better mechanical protection.
  • the invention is based on the knowledge that a heat shield made of a metal tube, which is electrically insulated from the current-carrying cooling system, can be adequately cooled via a refractory substance present between the cooling system and the metal tube while maintaining the required electrical insulation, i.e. can be kept at a temperature below the softening point, in particular at temperatures below 600 ° C.
  • a steel jacket can be used as a heat shield, i.e. a very simple structural element that offers excellent mechanical protection.
  • the liquid-cooled holder 1 shown in FIGS. 1 to 3 for the tip of an electrode of an arc melting furnace, not shown, contains a cylindrical clamping part 2 which can be fastened to the electrode support arm and in this case has a separate water cooling system, and a metallic cooling system which carries the electrode current and is fastened thereon 3, which in the present case consists of four flow tubes 4 to 7, which at the lower end carry a threaded part 8 in the form of a nipple for screwing on the electrode tip.
  • the preferably made of copper nipple 8 contains two channels 9 and 10. Through the channel 9, the flow tubes 4 and 5 and through the channel 10, the flow tubes 6 and 7 are connected to each other. Thus, in each of the two pairs of flow tubes 4 and 5 or 6 and 7, one flow tube serves as a feed line and the other as a return line for the cooling liquid.
  • the metallic cooling system 3 is surrounded by a metal tube 11 at a distance.
  • the metal tube is electrically insulated from the current-carrying cooling system 3.
  • a flange 12 welded to the metal pipe 11 is fastened to the bottom of the cup-shaped holder 2 via a spacer ring 13 made of heat-resistant insulating material.
  • a screw connection is selected as the fastening.
  • four screw-nut pairs 14 made of non-magnetic steel are provided, which are insulated from the metallic parts by spacers 15 and 16 made of heat-resistant insulating material - in the present case, shrinking temperature is chosen. These screws and nuts could also be made of an insulating material.
  • the power pipes of the cooling system 3 are made of copper. If the metal tube 11 is not also used to carry the electrode tip, it may be expedient to use another electrically well for the current tubes to provide conductive material that has a higher strength.
  • the refractory mass is intended on the one hand to ensure sufficient heat transfer between the metal pipe 11 to be cooled and the cooling system 3, and on the other hand also to provide good electrical insulation between the metal pipe 11 and the parts of the cooling system which carry the electrical current. Good results have been achieved with regard to this requirement with a refractory mass made of magnesium oxide sand or an alumina ramming mass.
  • a ramming mass or a pourable material as a refractory substance, the manufacture of the electrode is, as can be readily seen, extremely simple.
  • a soft carbon steel can be used as the material for the metal tube 11.
  • more advantageous are non-magnetic, scaling-resistant steels or possibly other highly heat-resistant non-magnetic metals.
  • the first exemplary embodiment described also contains the second exemplary embodiment, namely the liquid-cooled holder 1 according to FIGS. 4 to 6, a cylindrical clamping part 2a that can be fastened to the electrode support arm.
  • This clamping part 2a together with the pipe 18, which is preferably made of copper, and the threaded part 8a, which is designed in the form of a nipple, forms the conductor system or cooling system 3a carrying the electrode current and the cooling liquid.
  • 20 and 21 represent water discharge.
  • horizontal baffle plates 23 are provided, which are fixedly connected to the part 19 or formed in one piece.
  • the cooling system guiding the electrode current and the cooling liquid is surrounded at a distance by a metal tube 11a.
  • the metal tube 11 a a is again electrically insulated from the current-carrying cooling system.
  • a flange 12a welded to the metal tube 1a is attached to the lower end of the cylindrical clamping part 2a via a spacer ring 13a made of heat-resistant insulating material.
  • a screw connection 14a, 15a similar to the previously described exemplary embodiment is selected as the fastening.
  • an annular metal sheet 24 is welded or screwed onto the outer surface of the metal tube 11a.
  • the refractory substance 17a according to the first embodiment is arranged between the metal tube 11a and the tube 18 carrying the electrode current and the coolant.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Discharge Heating (AREA)

Description

Die Erfindung betrifft eine flüssigkeitsgekühlte Halterung für die Spitze einer Elecktrode eines Lichtbogenschmelzofens gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a liquid-cooled holder for the tip of an electrode of an arc melting furnace according to the preamble of patent claim 1.

Flüssigkeitsgekühlte Halterungen dieser Art, die den oberen Teil einer Lichtbogenelektrode mit verzehrbarer oder nicht verzehrbarer Electrodenspitze bilden, sind beispielsweise durch die DE-A-1 565 207 bekannt geworden. Um das metallische Kühlsystem dieser Halterung gegenüber der Strahlungsund Konvektionswärme des Lichtbogens sowie gegenüber den Gasen im Lichtbogenschmelzofen zu schützen, ist ein das Kühlsystem mit Abstand umgebender rohrförmiger Hitzeschirm aus sehr hitzefestem Material, wie Keramik, vorgesehen. Zur Verbesserung der mechanischen Festigkeit der keramischen Umhüllung kann diese mit einer Drahteinlage versehen sein.Liquid-cooled holders of this type, which form the upper part of an arc electrode with an edible or non-edible electrode tip, have become known, for example, from DE-A-1 565 207. In order to protect the metallic cooling system of this holder against the radiant and convection heat of the arc and against the gases in the arc melting furnace, a tubular heat shield made of very heat-resistant material, such as ceramic, surrounding the cooling system is provided. To improve the mechanical strength of the ceramic covering, it can be provided with a wire insert.

Beim Einsatz der Elektrode in einem Lichtbogenschmelzofen, in dem beispielsweise Schrott eingeschmolzen wird, kann es beim Einfahren der Elektrode oder auch durch Schrotteinstürze während des Betriebs vorkommen, daß die feuerfeste Schutzschicht um das Leitungssystem der Halterung beschädigt wird. Dabei kommt es zu Lichtbogenüberschlägen zwischen dem den elektrischen Strom der Lichtbogenelektrode leitenden Flüssigkeitssystem und dem metallischen Einsatz des Lichtbogenofens. In diesem Fall wird auch das Leitungssystem für die Kühlflüssigkeit sehr schnell beschädigt und es können Wassereinbrüche in den Lichtbogenofen und Explosionen die Folge sein. Hiervon ist zwar eine Elektrode mit einer Drahteinlage im keramischen Hitzeschirm etwas besser geschützt als eine ohne Drahteinlage, doch sind auch hier stellenweise Beschädigungen nicht ausgeschlossen, die zu den genannten Folgen führen.When using the electrode in an arc melting furnace, in which, for example, scrap is melted, it can happen that the refractory protective layer around the conduit system of the holder is damaged when the electrode is retracted or due to collapsed scrap during operation. Arc flashovers occur between the liquid system that conducts the electric current of the arc electrode and the metallic insert of the arc furnace. In this case, the pipe system for the coolant will also be damaged very quickly, resulting in water ingress into the arc furnace and explosions. Of this, an electrode with a wire insert in the ceramic heat shield is somewhat better protected than one without a wire insert, but here too, damage is not ruled out, which leads to the consequences mentioned.

Ziel der Erfindung ist eine flüssigkeitsgekühlte Halterung der einleitend genannten Art für eine Elektrodenspitze, die bei einem überraschend einfachen Aufbau nicht nur die gewünschte thermische Abschirmung des metallischen Kühlsystems gegenüber der Ofenatmosphäre, sondern auch einen besseren mechanischen Schutz gewährleistet.The aim of the invention is a liquid-cooled holder of the type mentioned in the introduction for an electrode tip which, with a surprisingly simple structure, not only ensures the desired thermal shielding of the metallic cooling system from the furnace atmosphere, but also better mechanical protection.

Dieses Ziel wird durch die kennzeichnenden Merkmale des Patentanspruches 1 erreicht. Vorteilhafte Ausgestaltungen der Erfindung sind den Unteransprüchen zu entnehmen.This goal is achieved by the characterizing features of claim 1. Advantageous embodiments of the invention can be found in the subclaims.

Die Erfindung beruht auf der Erkenntnis, daß ein Hitzeschirm aus einem Metallrohr, das gegenuber dem stromführenden Kühlsystem elektrisch isoliert ist, über eine zwischen dem Kühlsystem und dem Metallrohr vorhandene feuerfeste Substanz bei Aufrechterhaltung der erforderlichen elektrischen Isolation ausreichend kühlbar ist, d.h. auf einer Temperatur unterhalb des Erweichungspunktes, insbesondere auf Temperaturen unterhalb 600°C, gehalten werden kann.The invention is based on the knowledge that a heat shield made of a metal tube, which is electrically insulated from the current-carrying cooling system, can be adequately cooled via a refractory substance present between the cooling system and the metal tube while maintaining the required electrical insulation, i.e. can be kept at a temperature below the softening point, in particular at temperatures below 600 ° C.

Damit kann als Hitzeschirm ein Stahlmantel eingesetzt werden, also ein sehr einfaches konstruktives Element, das einen hervorragenden mechanischen Schutz bietet.This means that a steel jacket can be used as a heat shield, i.e. a very simple structural element that offers excellent mechanical protection.

Die Erfindung wird durch zwei Ausführungsbeispiele anhand von sechs Figuren näher erläutert. Es zeigen:

  • Fig. 1 den Längsschnitt einer ersten Ausführungsform
  • Fig. 2 die Draufsicht auf diese Halterung
  • Fig. 3 den Querschnitt 111-111 dieser Halterung
  • Fig. 4 den Längsschnitt einer zweiten Ausführungsform einer erfindungsgemäßen Halterung
  • Fig. 5 den Querschnitt V-V dieser Halterung
  • Fig. 6 den Querschnitt VI-VI dieser Halterung.
The invention is explained in more detail by two exemplary embodiments with reference to six figures. Show it:
  • Fig. 1 shows the longitudinal section of a first embodiment
  • Fig. 2 is a top view of this bracket
  • Fig. 3 shows the cross section 111-111 of this bracket
  • Fig. 4 shows the longitudinal section of a second embodiment of a holder according to the invention
  • Fig. 5 shows the cross section VV of this bracket
  • Fig. 6 shows the cross section VI-VI of this bracket.

Die in den Fig. 1 bis 3 dargestellte flüssigkeitsgekühlte Halterung 1 für die nicht dargestellte Spitze einer Elektrode eines Lichtbogenschmelzofens enthält einen am Elektrodentragarm befestigbaren zylindrischen Einspannteil 2, der in diesem Fall eine separate Wasserkühlung aufweist, und ein an diesem befestigtes, den Elektrodenstrom führendes metallisches Kühlsystem 3, das im vorliegenden Fall aus vier Stromrohren 4 bis 7 besteht, welche am unteren Ende ein in Form einess Nippels ausgebildetes Gewindeteil 8 zum Aufschrauben der Elektrodenspitze tragen. Der vorzugsweise aus Kupfer bestehende Nippel 8 enthält zwei Kanäle 9 und 10. Durch den Kanal 9 werden die Stromrohre 4 und 5 und durch den Kanal 10 die Stromrohre 6 und 7 miteinander verbunden. Damit dient bei jedem der beiden Paare von Stromrohren 4 und 5 bzw. 6 und 7 ein Stromrohr als Zuleitung und das andere als Rückleitung für die Kühlflüssigkeit.The liquid-cooled holder 1 shown in FIGS. 1 to 3 for the tip of an electrode of an arc melting furnace, not shown, contains a cylindrical clamping part 2 which can be fastened to the electrode support arm and in this case has a separate water cooling system, and a metallic cooling system which carries the electrode current and is fastened thereon 3, which in the present case consists of four flow tubes 4 to 7, which at the lower end carry a threaded part 8 in the form of a nipple for screwing on the electrode tip. The preferably made of copper nipple 8 contains two channels 9 and 10. Through the channel 9, the flow tubes 4 and 5 and through the channel 10, the flow tubes 6 and 7 are connected to each other. Thus, in each of the two pairs of flow tubes 4 and 5 or 6 and 7, one flow tube serves as a feed line and the other as a return line for the cooling liquid.

Das metallische Kühlsystem 3 ist mit Abstand von einem Metallrohr 11 umgeben. Das Metallrohr ist gegenüber dem stromführenden Kühlsystem 3 elektrisch isoliert. Zu diesem Zweck ist ein am Metallrohr 11 angeschweißter Flansch 12 über einen Distanzring 13 aus hitzebeständigem Isoliermaterial am Boden der topfförmig ausbebildeten Halterung 2 befestigt. Als Befestigung ist eine Schraubverbindung gewählt. Im vorliegenden Fall sind vier Schrauben-Mutter-Paare 14 aus amagnetischem Stahl vorgesehen, die durch Distanzstücke 15 und 16 aus hitzebeständigem Isoliermaterial - im vorliegenden Fall ist Schrumpfpertinax gewählt - gegenüber den metallischen Teilen isoliert sind. Diese Schrauben und Muttern könnten auch aus einem lsoliermaterial bestehen. Die Stromrohre des Kühlsystems 3 sind aus Kupfer. Falls das Metallrohr 11 nicht auch zum Tragen der Elektrodenspitze herangezogen wird, kann es zweckmäßig sein, für die Stromrohre ein anderes gut elektrisch leitendes Material vorzusehen, das eine höhere Festigkeit aufweist.The metallic cooling system 3 is surrounded by a metal tube 11 at a distance. The metal tube is electrically insulated from the current-carrying cooling system 3. For this purpose, a flange 12 welded to the metal pipe 11 is fastened to the bottom of the cup-shaped holder 2 via a spacer ring 13 made of heat-resistant insulating material. A screw connection is selected as the fastening. In the present case, four screw-nut pairs 14 made of non-magnetic steel are provided, which are insulated from the metallic parts by spacers 15 and 16 made of heat-resistant insulating material - in the present case, shrinking temperature is chosen. These screws and nuts could also be made of an insulating material. The power pipes of the cooling system 3 are made of copper. If the metal tube 11 is not also used to carry the electrode tip, it may be expedient to use another electrically well for the current tubes to provide conductive material that has a higher strength.

Zwischen dem Metallrohr 11 und dem Kühlsystem 3 ist eine feuerfeste Substanz 17 vorhanden, über die die Kühlung des Metallrohres auf die genannte zulässige obere Grenze bewirkt wird. Die Feuerfestmasse soll bei den Betriebstemperaturen einerseits einen ausreichenden Wärmeübergang zwischen dem zu kühlenden Metallrohr 11 und dem Kühlsystem 3 gewährleisten, andererseits aber auch eine gute elektrische Isolation zwischen dem Metallrohr 11 und dem den elektrischen Strom führenden Teilen des Kühlsystems. Gute Ergebnisse sind im Hinblick auf diese Forderung erzielt worden mit einer Feuerfestmasse aus Magnesiumoxidsand oder einer Aluminiumoxidstampfmasse. Bei Verwendung eines kömigen Materials, einer Stampfmasse oder eines vergießbaren Materials als feuerfeste Substanz ist die Herstellung der Elektrode, wie ohne weiteres ersichtlich, außerordentlich einfach. Nach dem Befestigen des Metallrohres 11 am Einspannteil 2 braucht der Zwischenraum zwischen dem Kühlsystem und dem Metallrohr nur mit der Feuerfestmasse ausgefüllt, ausgestampft oder ausgegossen zu werden.Between the metal pipe 11 and the cooling system 3 there is a refractory substance 17, by means of which the cooling of the metal pipe to the permissible upper limit is effected. At the operating temperatures, the refractory mass is intended on the one hand to ensure sufficient heat transfer between the metal pipe 11 to be cooled and the cooling system 3, and on the other hand also to provide good electrical insulation between the metal pipe 11 and the parts of the cooling system which carry the electrical current. Good results have been achieved with regard to this requirement with a refractory mass made of magnesium oxide sand or an alumina ramming mass. When using a granular material, a ramming mass or a pourable material as a refractory substance, the manufacture of the electrode is, as can be readily seen, extremely simple. After the metal tube 11 has been fastened to the clamping part 2, the space between the cooling system and the metal tube only needs to be filled, stamped out or poured out with the refractory material.

Als Material für das Metallrohr 11 kann aus wirtschaftlichen Gründen ein weicher Kohlenstoffstahl verwendet werden. Vorteilhafter sind jedoch amagnetische, zunderbeständige Stähle oder evtl. auch andere hochhitzebeständige amagnetische Metalle.For economic reasons, a soft carbon steel can be used as the material for the metal tube 11. However, more advantageous are non-magnetic, scaling-resistant steels or possibly other highly heat-resistant non-magnetic metals.

Wei das beschriebene erste Ausführungsbeispiel enthält auch das zweite Ausführungsbeispiel, nämlich die flüssigkeitsgekühlte Halterung 1 gemäß den Fig. 4 bis 6 ein am Elektrodentragarm befestigbares zylindrisches Einspannteil 2a. Dieses Einspannteil 2a bildet mit dem vorzugsweise aus Kupfer angefertigten Rohr 18 und dem in Form eines Nippels ausgebildeten Gewindeteil 8a das den Elektrodenstrom und die Kühlflüssigkeit führende Leitersystem bzw. Kühlsystem 3a.The first exemplary embodiment described also contains the second exemplary embodiment, namely the liquid-cooled holder 1 according to FIGS. 4 to 6, a cylindrical clamping part 2a that can be fastened to the electrode support arm. This clamping part 2a, together with the pipe 18, which is preferably made of copper, and the threaded part 8a, which is designed in the form of a nipple, forms the conductor system or cooling system 3a carrying the electrode current and the cooling liquid.

Zur Zwangsführung der Kühlflüssigkeit ist in das den Elektrodenstrom und die Kühlflüssig- keit führende Kühlsystem 3a ein geschweißtes oder gegossenes metallisches Teil 19 eingepaßt und eingeschoben. 20 und 21 stellen Wasserzund -abfuhr dar. In den vier äußeren, senkrechten Kanälen 22 sind wechselseitig angeordnete, im vorliegenden Fall horizontale Umlenkbleche 23 vorgesehen, die mit dem Teil 19 fest verbunden oder einstückig ausgebildet sind.For the forced guidance of the cooling liquid is in the fitted electrode current and the Kühlflüssi g- ness leading cooling system 3a a welded or cast metal part 19 and inserted. 20 and 21 represent water discharge. In the four outer, vertical channels 22, mutually arranged, in the present case horizontal baffle plates 23 are provided, which are fixedly connected to the part 19 or formed in one piece.

Unterhalb des Einspannteiles 2a ist das den Elektrodenstrom und die Kühlflüssigkeit führende Kühlsystem mit Abstand von einem Metallrohr 11 a umgeben. Das Metallrohr 11 a a ist wieder gegenüber dem stromführenden Kühlsystem elektrisch isoliert.Below the clamping part 2a, the cooling system guiding the electrode current and the cooling liquid is surrounded at a distance by a metal tube 11a. The metal tube 11 a a is again electrically insulated from the current-carrying cooling system.

Zu diesem Zweck ist wiederum ein an dem Metallrohr 1 a angeschweißter Flansch 12a über einen Distanzring 13a aus hitzebeständigem Isoliermaterial am unteren Ende des zylindrischen Einspannteiles 2a befestigt. Als Befestigung ist eine dem zuvor beschriebenen Ausführungsbeispiel ähnliche Schraubverbindung 14a, 15a gewählt. Zum Schutze der Schraubverbindung 14a und "5a ist in diesem Ausführungsbeispiel auf der Außbenfläche des Metallrohres 11a ein ringförmig ausgebildetes, metallisches Blech 24 angeschweißt oder angeschraubt.For this purpose, in turn, a flange 12a welded to the metal tube 1a is attached to the lower end of the cylindrical clamping part 2a via a spacer ring 13a made of heat-resistant insulating material. A screw connection 14a, 15a similar to the previously described exemplary embodiment is selected as the fastening. In order to protect the screw connection 14a and 5a, in this exemplary embodiment an annular metal sheet 24 is welded or screwed onto the outer surface of the metal tube 11a.

Zwischen dem Metallrohr 11 a und dem den Elektrodenstrom und die kühlflüssigkeit führenden Rohr 18 ist die feuerfeste Substanz 17a entsprechend dem ersten Ausführungsbeispiel angeordnet.The refractory substance 17a according to the first embodiment is arranged between the metal tube 11a and the tube 18 carrying the electrode current and the coolant.

Claims (15)

1. A fluid-cooled holder (1, 1a) for the tip of an electrode of an electric arc melting furnace, having a cylindrical clamping portion (2, 2a) which can be secured to the electrode support arm, a metal cooling system (3, 3a) which is secured to the clamping portion (2, 2a) and which carries the electrode current and which at the free end has a threaded portion (8, 8a) for screwing on the electrode tip, and further having a tubular heat screening means which is disposed around the cooling system (3, 3a) at a spacing, characterised in that the heat screening means comprises a metal tube (11, 11 a) which is electrically insulated from the current-carrying cooling system (3, 3a) and which can be sufficiently cooled by way of a refractory substance (17, 17a) between the cooling system and the metal tube, to keep its temperature at a value below the softening temperature of the material of the metal tube, when the holder is used in the electric arc furnace.
2. A fluid-cooled holder according to claim 1 characterised in that the metal tube (11, 11 a) can be cooled so severely that its temperature in use in the electric arc furnace can be restricted to a maximum of 600°C.
3. a fluid-cooled holder according to claim 1 or claim 2 characterised in that the metal tube (11, 11 a) is produced from a soft carbon steel.
4. A fluid-cooled holder according to claim 1 or claim 2 characterised in that the metal tube (11, 11 a) is produced from an amagnetic metal.
5. A fluid-cooled holder according to'claim 3 or claim 4 characterised in that the metal tube (11, 11 a) is produced from a steel of elevated resistance to scaling.
6. A fluid-cooled holder according to one of claims 1 to 5 characterised in that the refractory substance (17, 17a) is a refractory material which on the one hand is electrically insulating and on the other hand is sufficiently heat- conducting.
7. A fluid-cooled holder according to claim 6 characterised in that the refractory substance (17, 17a) is a granular, tampable or castable refractory material.
8. A fluid-cooled holder according to claim 6 or claim 7 characterised in that the refractory substance (17, 17a) is magnesium oxide.
9. A fluid-cooled holder according to claim 6 or claim 7 characterised in that the refractory substance (17, 17a) is aluminium oxide.
10. A fluid-cooled holder according to one of claims 1 to 9 characterised in that the fluid system comprises at least one pair of metal pipes (4 to 7) which carry the threaded portion (8) for screwing on the electrode tip and are in communication with each other by at least one fluid passage (9, 10) in the threaded portion.
11. A fluid-cooled holder according to one of claims 1 to 9 characterised in that the cooling system (3a) which carries the electrode current and the cooling fluid includes an inner tube (19) which is fitted into an outer metal tube (18) at a spacing and that the annular space between the two tubes communicates with the interior of the inner tube (19) in the lower region (8a) of the electrode holder (1a).
12. A fluid-cooled holder according to claim 11 characterised in that deflection plates (23) for the cooling fluid are arranged in the annular space between the two tubes (18, 19).
13. A fluid-cooled holder according to claim 11 or claim 12 characterised in that the inner tube (19) together with the deflection plates (23) is formed as an independent, welded or cast member which is inserted into the outer tube (18).
14. A fluid-cooled holder according to one of claims 11 to 13 characterised in that the outer tube (18) is of a circular configuration and the inner tube (19) is of a square or rectangular configuration and that the annular space between the two tubes is subdivided into four sector-shaped channels (22) by the outside edges of the inner tube.
15. A fluid-cooled holder according to claim 14 characterised in that a flow path which is of a meander or zig-zag configuration is formed by a displaced arrangement of the deflection plates (23) in the longitudinal direction of the tubes (18, 19).
EP79104036A 1978-10-18 1979-10-18 Liquid-cooled support for the head of an electrode Expired EP0010305B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79104036T ATE43T1 (en) 1978-10-18 1979-10-18 LIQUID-COOLED HOLDER FOR AN ELECTRODE TIP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2845367 1978-10-18
DE2845367A DE2845367C2 (en) 1978-10-18 1978-10-18 Liquid-cooled holder for the tip of an electrode of an arc furnace

Publications (2)

Publication Number Publication Date
EP0010305A1 EP0010305A1 (en) 1980-04-30
EP0010305B1 true EP0010305B1 (en) 1981-04-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP79104036A Expired EP0010305B1 (en) 1978-10-18 1979-10-18 Liquid-cooled support for the head of an electrode

Country Status (11)

Country Link
US (1) US4291190A (en)
EP (1) EP0010305B1 (en)
JP (1) JPS5557295A (en)
AR (1) AR220782A1 (en)
AT (1) ATE43T1 (en)
BR (1) BR7906676A (en)
CA (1) CA1131278A (en)
DE (2) DE2845367C2 (en)
ES (1) ES485398A1 (en)
GB (1) GB2036517B (en)
MX (1) MX146063A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050683A1 (en) * 1980-10-27 1982-05-05 Arc Technologies Systems, Ltd. Electrode for arc furnaces
EP0051074A1 (en) * 1980-10-27 1982-05-12 Arc Technologies Systems, Ltd. Electrode for arc furnaces
EP0075534A1 (en) * 1981-09-10 1983-03-30 Arc Technologies Systems, Ltd. Axially movable electrode holder for use in electric steel production
EP0077513A1 (en) * 1981-10-15 1983-04-27 C. Conradty Nürnberg GmbH & Co. KG Method of preventing the consumption of a current-conducting electrode for metallurgical furnaces, and electrode
EP0079304A1 (en) * 1981-11-09 1983-05-18 Arc Technologies Systems, Ltd. Electrode holder for arc furnaces
DE3344283A1 (en) * 1983-12-07 1985-06-20 Fuchs Systemtechnik GmbH, 7601 Willstätt Liquid-cooled holder for a consumable electrode of an arc furnace
EP0149768A1 (en) * 1983-12-07 1985-07-31 Fuchs Systemtechnik GmbH Liquid-cooled holder element of a composite electrode for electric arc furnace

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DE3071711D1 (en) * 1980-10-27 1986-09-25 Arc Tech Syst Ltd Electrode for arc furnaces
DE3102776A1 (en) * 1981-01-28 1982-08-26 C. Conradty Nürnberg GmbH & Co KG, 8505 Röthenbach ELECTRODE FOR ARC FURNACE
DE3116221A1 (en) * 1981-04-23 1982-11-11 C. Conradty Nürnberg GmbH & Co KG, 8505 Röthenbach ELECTRODE FOR ARC FURNACES AND THEIR USE
ZA832152B (en) * 1982-04-23 1983-12-28 Arc Tech Syst Ltd Arrangement of an electrode for arc furnaces
US4433419A (en) * 1982-04-23 1984-02-21 Owens-Corning Fiberglas Corporation Electrode purge sleeve for glass melting furnaces
US4453913A (en) * 1982-05-21 1984-06-12 The Cadre Corporation Recuperative burner
CA1199358A (en) * 1982-06-04 1986-01-14 Robert W. Montgomery Electric arc furnace electrodes
US4416014A (en) * 1982-08-03 1983-11-15 Great Lakes Carbon Corporation Composite electrode for arc furnace
US4490824A (en) * 1983-07-15 1984-12-25 Great Lakes Carbon Corporation Composite electrode for arc furnace
US4513425A (en) * 1983-07-15 1985-04-23 Great Lakes Carbon Corporation Composite electrode for arc furnace
DE3339514A1 (en) * 1983-10-28 1985-05-09 Mannesmann AG, 4000 Düsseldorf ELECTRODE ARRANGEMENT IN WARM-TYPE VESSELS
MX173237B (en) * 1990-08-21 1994-02-10 Blas Diaz Pena IMPROVEMENTS IN ELECTRIC METAL CASTING OVEN, NON-CONSUMABLE AND WATER COOLED
ES2147061B1 (en) * 1996-10-31 2001-04-01 Fundacion Inasmet PLASMA TORCH PERFECTED WITH FAST SPARE REFRIGERATED ELECTRODE.
RU2705832C1 (en) * 2019-04-11 2019-11-12 Федеральное государственное бюджетное образовательное учреждение высшего образования "Чувашский государственный университет имени И.Н. Ульянова" Electric holder of arc electric furnace
CN112029955A (en) * 2020-08-21 2020-12-04 石家庄钢铁有限责任公司 Electric furnace steelmaking conductive cross arm protection method

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050683A1 (en) * 1980-10-27 1982-05-05 Arc Technologies Systems, Ltd. Electrode for arc furnaces
EP0051074A1 (en) * 1980-10-27 1982-05-12 Arc Technologies Systems, Ltd. Electrode for arc furnaces
EP0075534A1 (en) * 1981-09-10 1983-03-30 Arc Technologies Systems, Ltd. Axially movable electrode holder for use in electric steel production
EP0077513A1 (en) * 1981-10-15 1983-04-27 C. Conradty Nürnberg GmbH & Co. KG Method of preventing the consumption of a current-conducting electrode for metallurgical furnaces, and electrode
EP0079304A1 (en) * 1981-11-09 1983-05-18 Arc Technologies Systems, Ltd. Electrode holder for arc furnaces
DE3344283A1 (en) * 1983-12-07 1985-06-20 Fuchs Systemtechnik GmbH, 7601 Willstätt Liquid-cooled holder for a consumable electrode of an arc furnace
EP0149768A1 (en) * 1983-12-07 1985-07-31 Fuchs Systemtechnik GmbH Liquid-cooled holder element of a composite electrode for electric arc furnace

Also Published As

Publication number Publication date
GB2036517B (en) 1982-11-10
DE2960277D1 (en) 1981-07-30
CA1131278A (en) 1982-09-07
EP0010305A1 (en) 1980-04-30
AR220782A1 (en) 1980-11-28
BR7906676A (en) 1980-07-22
ATE43T1 (en) 1981-05-15
JPS5557295A (en) 1980-04-26
US4291190A (en) 1981-09-22
DE2845367B1 (en) 1980-04-24
MX146063A (en) 1982-05-07
DE2845367C2 (en) 1981-01-22
ES485398A1 (en) 1980-05-16
GB2036517A (en) 1980-06-25

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