EP0031482A1 - Contact electrode for fusion and heating furnaces with direct current plasma heating - Google Patents

Contact electrode for fusion and heating furnaces with direct current plasma heating Download PDF

Info

Publication number
EP0031482A1
EP0031482A1 EP80107583A EP80107583A EP0031482A1 EP 0031482 A1 EP0031482 A1 EP 0031482A1 EP 80107583 A EP80107583 A EP 80107583A EP 80107583 A EP80107583 A EP 80107583A EP 0031482 A1 EP0031482 A1 EP 0031482A1
Authority
EP
European Patent Office
Prior art keywords
contact electrode
heating
direct current
face
current plasma
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP80107583A
Other languages
German (de)
French (fr)
Other versions
EP0031482B1 (en
Inventor
Herbert Pietzsch
Walter Dipl.Jur Lachner
Karlheinz Hofmann
Erich Pötzsch
Fred Dr. Ing. Esser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Edelstahlwerk 8 Mai 1945 Freital VEB
Original Assignee
Edelstahlwerk 8 Mai 1945 Freital VEB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Edelstahlwerk 8 Mai 1945 Freital VEB filed Critical Edelstahlwerk 8 Mai 1945 Freital VEB
Priority to AT80107583T priority Critical patent/ATE5360T1/en
Publication of EP0031482A1 publication Critical patent/EP0031482A1/en
Application granted granted Critical
Publication of EP0031482B1 publication Critical patent/EP0031482B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • 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
    • H05B7/06—Electrodes

Definitions

  • the invention relates to melting and heating furnaces with direct current plasma heating.
  • the contact electrode In the case of plasma melting furnaces with high currents, the contact electrode is subject to particularly severe thermal wear, which limits its durability.
  • the aim of the invention is. To create contact electrodes for melting and heating furnaces with DC plasma heating and high currents, preferably in the range of 10 to 40 kA, with a long service life, favorable heat transfer conditions and low material consumption.
  • the object is achieved in that the flow body made of a corrosion-resistant material ensures uniform heat dissipation over the entire end face of the contact electrode, a temperature sensor is located below the end face of the contact electrode, which signals exceptional thermal loads and a steel head as a wearing part with the end face of the Contact electrode is metallically connected.
  • a steel head 2 designed as a wearing part is metallically connected to the contact electrode 1.
  • the flow body 4 which is due to the special design of its forehead surface 5 causes uniform cooling of the end face 6 of the contact electrode 1.
  • a temperature sensor 7 is located below the end face 6 for signaling unusual thermal loads.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Furnace Details (AREA)
  • Discharge Heating (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Resistance Heating (AREA)

Abstract

1. A contact electrode for melting and heating furnaces with direct current plasma heating, in which a flow member (4) is provided in a bore (3) in the contact electrode (1) for the supply of a cooling medium, the flow member orifice being situated opposite the end face (6) of the contact electrode, characterized in that the orifice of the flow member (4), which is made from a corrosion resistant material, has a widening (5) such as to ensure uniformly intensive cooling of the end face (6) of the contact electrode (1).

Description

Die Erfindung bezieht sich auf Schmelz- und Wärmeöfen mit Gleichstromplasmabeheizung.The invention relates to melting and heating furnaces with direct current plasma heating.

Kontaktelektroden mit Wasserkühlung oder anderen Medien sind bekannt. Sie weisen häufig schlechte elektrische Kontakt- sowie ungenügende Wärmeübergangs- und Kühlmittelströmungsverhältnisse auf, die zum Anschmelzen bzw, zur Zerstörung der Kontaktelektrode führen.Contact electrodes with water cooling or other media are known. They often have poor electrical contact and inadequate heat transfer and coolant flow conditions, which lead to melting or destruction of the contact electrode.

Bei Plasmaschmelzöfen mit hohen Stromstärken ist die Kontaktelektrode besonders starkem thermischen Verschleiß unterworfen, wodurch ihre Haltbarkeit begrenzt wird.In the case of plasma melting furnaces with high currents, the contact electrode is subject to particularly severe thermal wear, which limits its durability.

Das Ziel der Erfindung besteht darin. Kontaktelektroden für Schmelz- und Wärmeöfen mit Gleichstromplasmabeheizung und hohen Stromstärken, vorzugsweise im Bereich von 10 bis 40 kA, mit hoher Lebensdauer, günstigen Wärmeübergangsbedingungen und niedrigem Materialverbrauch zu schaffen. Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß der aus einem korrosionsbeständigen Werkstoff hergestellte Strömungskörper über die gesamte Stirnfläche der Kontaktelektrode eine gleichmäßige Wärmeabführung gewährleistet, sich unterhalb der Stirnfläche der Kontaktelektrode ein Temperaturgeber befindet, der außergewöhnliche thermische Belastungen signalisiert und ein Stahlkopf als Verschleißteil mit der Stirnfläche der Kontaktelektrode metallisch verbunden ist.The aim of the invention is. To create contact electrodes for melting and heating furnaces with DC plasma heating and high currents, preferably in the range of 10 to 40 kA, with a long service life, favorable heat transfer conditions and low material consumption. According to the invention the object is achieved in that the flow body made of a corrosion-resistant material ensures uniform heat dissipation over the entire end face of the contact electrode, a temperature sensor is located below the end face of the contact electrode, which signals exceptional thermal loads and a steel head as a wearing part with the end face of the Contact electrode is metallically connected.

Die Erfindung wird anhand einer Zeichnung näher erläutert. Mit der Kontaktelektrode 1 ist ein als Verschleißteil ausgebildeter Stahlkopf 2 metallisch verbunden. In der Bohrung 3 der Kontaktelektrode 1 befindet sich der Strömungskörper 4, der durch die besondere Ausbildung seiner Stirnfläche 5 die gleichmäßige Kühlung der Stirnfläche 6 der Kontaktelektrode 1 bewirkt. Zum Signalisieren außergewöhnlicher thermischer Belastungen befindet sich unterhalb der Stirnfläche 6 ein Temperaturgeber 7.The invention is explained in more detail with reference to a drawing. A steel head 2 designed as a wearing part is metallically connected to the contact electrode 1. In the bore 3 of the contact electrode 1 is the flow body 4, which is due to the special design of its forehead surface 5 causes uniform cooling of the end face 6 of the contact electrode 1. A temperature sensor 7 is located below the end face 6 for signaling unusual thermal loads.

Claims (3)

1. Kontaktelektrode für Schmelz- und Wärmeöfen mit Gleich- stromplasma beheizung, gekennzeichnet dadurch, daß der aus einem korrosionsbeständigen Werkstoff hergestellte Strö- mungskörper (4) eine intensive Kühlung der Stirnfläche (6) der Kontaktelektrode (1) gewährleistet.1. contact electrode for melting and heating furnaces with direct current plasma heating, characterized in that the Strö made of a corrosion-resistant material - mung body (4) an intensive cooling of the end face (6) of the contact electrode (1) is ensured. 2. Kontaktelektrode nach Patentanspruch 1, gekennzeichnet dadurch, daß sich unterhalb der Stirnfläche (6) der Kontaktelektrode (1) ein Temperaturgeber (7) befindet.2. Contact electrode according to claim 1, characterized in that there is a temperature sensor (7) below the end face (6) of the contact electrode (1). 3. Kontaktelektrode nach Patentanspruch 1, gekennzeichnet dadurch. daß ein Stahlkopf (2) als Verschleißteil mit der Stirnfläche der Kontaktelektrode (1) metallisch verbunden ist.3. Contact electrode according to claim 1, characterized in that. that a steel head (2) is connected as a wearing part to the end face of the contact electrode (1).
EP80107583A 1979-12-19 1980-12-04 Contact electrode for fusion and heating furnaces with direct current plasma heating Expired EP0031482B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80107583T ATE5360T1 (en) 1979-12-19 1980-12-04 CONTACT ELECTRODE FOR MELTING AND HEATING FURNACES WITH DIRECT CURRENT PLASMA HEATING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD217836 1979-12-19
DD21783679 1979-12-19

Publications (2)

Publication Number Publication Date
EP0031482A1 true EP0031482A1 (en) 1981-07-08
EP0031482B1 EP0031482B1 (en) 1983-11-16

Family

ID=5521768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80107583A Expired EP0031482B1 (en) 1979-12-19 1980-12-04 Contact electrode for fusion and heating furnaces with direct current plasma heating

Country Status (6)

Country Link
EP (1) EP0031482B1 (en)
JP (1) JPS56132794A (en)
AT (1) ATE5360T1 (en)
DE (1) DE3065637D1 (en)
ES (1) ES267964Y (en)
YU (1) YU311480A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0133652A1 (en) * 1983-07-28 1985-03-06 BBC Aktiengesellschaft Brown, Boveri & Cie. Protective device for a bottom electrode of a direct current arc furnace
EP0133931A1 (en) * 1983-07-28 1985-03-13 BBC Brown Boveri AG Cooling arrangement of a bottom electrode of a direct current arc furnace
FR2558677A1 (en) * 1983-10-28 1985-07-26 Mannesmann Ag ARRANGEMENT OF ELECTRODES IN CONTAINERS SUBJECT TO THERMAL CONSTRAINTS
EP0328283A1 (en) * 1988-02-09 1989-08-16 Ea Technology Limited Heating apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1565468A (en) * 1967-02-02 1969-05-02
FR2054750A5 (en) * 1969-07-25 1971-05-07 Baccarat Cristalleries Electrode for crystal glass melting furnace
DE2637632A1 (en) * 1976-08-20 1978-02-23 Schelepov Bottom electrode for plasma arc melting furnace - where pressurised gas zone indicates electrode wear, and acts as safety device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53125911A (en) * 1977-04-11 1978-11-02 Inst Elektroswarki Patona Feed apparatus for plasma arc furnace

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1565468A (en) * 1967-02-02 1969-05-02
FR2054750A5 (en) * 1969-07-25 1971-05-07 Baccarat Cristalleries Electrode for crystal glass melting furnace
DE2637632A1 (en) * 1976-08-20 1978-02-23 Schelepov Bottom electrode for plasma arc melting furnace - where pressurised gas zone indicates electrode wear, and acts as safety device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0133652A1 (en) * 1983-07-28 1985-03-06 BBC Aktiengesellschaft Brown, Boveri & Cie. Protective device for a bottom electrode of a direct current arc furnace
EP0133931A1 (en) * 1983-07-28 1985-03-13 BBC Brown Boveri AG Cooling arrangement of a bottom electrode of a direct current arc furnace
FR2558677A1 (en) * 1983-10-28 1985-07-26 Mannesmann Ag ARRANGEMENT OF ELECTRODES IN CONTAINERS SUBJECT TO THERMAL CONSTRAINTS
EP0328283A1 (en) * 1988-02-09 1989-08-16 Ea Technology Limited Heating apparatus
US4959525A (en) * 1988-02-09 1990-09-25 Electricity Association Services Limited Apparatus for heating an electrically conductive flowable material flowing through a pipeline

Also Published As

Publication number Publication date
EP0031482B1 (en) 1983-11-16
JPS56132794A (en) 1981-10-17
YU311480A (en) 1982-08-31
ES267964Y (en) 1984-08-01
DE3065637D1 (en) 1983-12-22
ES267964U (en) 1984-01-16
ATE5360T1 (en) 1983-12-15

Similar Documents

Publication Publication Date Title
EP0474795B1 (en) Printed circuit board for a power electronic circuit
DE2014480A1 (en) Highly heat-resistant protective cover
DE2719572A1 (en) FEED CHANNEL FOR MELT LIQUID GLASS TO COMPARE THE TEMPERATURE OF THE MELT
DE3339514C2 (en)
EP0031482A1 (en) Contact electrode for fusion and heating furnaces with direct current plasma heating
EP0930371A1 (en) Stove cooler for shaft furnaces
EP0875605A2 (en) Arrangement for the electrogalvanic metal coating of strips
EP1627195B1 (en) Process container with cooling elements
DE3419681C2 (en)
EP0030679B1 (en) High-power plasmatron's nozzle
DE2117956A1 (en) Rotating anode X-ray tube - with tungsten ring soldered to grain-oriented fibre-reinforced graphite disc
DE2517885A1 (en) METHOD FOR PROTECTING ALTERNATING CURRENT METAL HEATING ELECTRODES FOR MELTING FURNACES USING DC CURRENT AND ARRANGEMENT FOR CARRYING OUT THIS PROCEDURE
WO2007025505A2 (en) Plasma welding and cutting torch comprising a cooling system
EP0164714A3 (en) Primary energy source for heat pump heating systems
DE1807843B1 (en) Resistance-heated metallurgical melting furnace, in particular hearth melting furnace
DE1964816A1 (en) Plasma torch, preferably for cleaning rails
US4434494A (en) Contact electrode for melting and heating furnaces with DC plasma heating
EP0411272A1 (en) Gas-shielded torch
DD240538A1 (en) BASIN WALL FOR OVENS FOR MELTING GLASS OR SIMILAR MATERIALS
DE2600696C2 (en) Patenting system with molten metal kept in circulation
DD132356B1 (en) INDUCTOR FOR THE INTERNAL HARDENING OF HOLLOW CYLINDERS, PARTICULARLY JACKS
DE2345182C3 (en) Cooling water line in the nozzle of an electric arc shield gas welding gun
DE1615404C3 (en) Arc furnace
DD239781A1 (en) BASIN WALL FOR OVENS FOR MELTING GLASS OR SIMILAR MATERIALS
Meshcheryaakov et al. Corrosion Resistance of the Metal Adjacent to the Weld in Low-Alloy Zirconium Systems

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT SE

17P Request for examination filed

Effective date: 19811209

ITF It: translation for a ep patent filed

Owner name: DR. ING. A. RACHELI & C.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI SE

REF Corresponds to:

Ref document number: 5360

Country of ref document: AT

Date of ref document: 19831215

Kind code of ref document: T

ET Fr: translation filed
REF Corresponds to:

Ref document number: 3065637

Country of ref document: DE

Date of ref document: 19831222

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19921019

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19921020

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19921021

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19921030

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19921120

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19921217

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19921229

Year of fee payment: 13

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732

REG Reference to a national code

Ref country code: CH

Ref legal event code: PFA

Free format text: SAECHSISCHE EDELSTAHLWERKE GMBH

REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19931204

Ref country code: AT

Effective date: 19931204

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19931205

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19931231

Ref country code: CH

Effective date: 19931231

Ref country code: BE

Effective date: 19931231

BERE Be: lapsed

Owner name: FREITAL

Effective date: 19931231

Owner name: SACHSISCHE EDELSTAHLWERK G.M.B.H.

Effective date: 19931231

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19931204

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19940831

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19940901

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 80107583.9

Effective date: 19940710