EP0037788B1 - Installation et procédé pour fondre ou pour maintenir en fusion une matière métallique par élément résistant immergé dans le métal - Google Patents

Installation et procédé pour fondre ou pour maintenir en fusion une matière métallique par élément résistant immergé dans le métal Download PDF

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Publication number
EP0037788B1
EP0037788B1 EP81400564A EP81400564A EP0037788B1 EP 0037788 B1 EP0037788 B1 EP 0037788B1 EP 81400564 A EP81400564 A EP 81400564A EP 81400564 A EP81400564 A EP 81400564A EP 0037788 B1 EP0037788 B1 EP 0037788B1
Authority
EP
European Patent Office
Prior art keywords
aluminium
installation
molten state
maintaining
volts
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.)
Expired
Application number
EP81400564A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0037788A1 (fr
Inventor
Jean Rouveyre
Alain Rouveyre
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.)
Fours Mgr Sa Dite Ste
Original Assignee
Fours Mgr Sa Dite Ste
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 Fours Mgr Sa Dite Ste filed Critical Fours Mgr Sa Dite Ste
Priority to AT81400564T priority Critical patent/ATE11594T1/de
Publication of EP0037788A1 publication Critical patent/EP0037788A1/fr
Application granted granted Critical
Publication of EP0037788B1 publication Critical patent/EP0037788B1/fr
Expired legal-status Critical Current

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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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/62—Heating elements specially adapted for furnaces
    • H05B3/64—Heating elements specially adapted for furnaces using ribbon, rod, or wire heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0006—Electric heating elements or system
    • F27D2099/0008—Resistor heating
    • F27D2099/0011—The resistor heats a radiant tube or surface
    • F27D2099/0013—The resistor heats a radiant tube or surface immersed in the charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00—Arrangement of monitoring devices; Arrangement of safety devices
    • F27D21/0014—Devices for monitoring temperature

Definitions

  • the present invention relates to installations for melting a metallic material or for keeping molten material, as well as to methods for heating a molten material or for conducting electricity.
  • the fusion or maintenance of fusion of materials normally solid at room temperature, electrically conductive, such as metals, can be carried out in various installations.
  • the crucible furnace is heated by flames or by electric resistances, radiating energy on the crucible, the flame abrades and wears down the refractory materials constituting the furnace.
  • the electrical resistances do not withstand high temperatures.
  • a crucible induction furnace is expensive to install and maintain, in particular because of its inductors. Troubleshooting can only be carried out by specialist electronics engineers.
  • the invention overcomes these drawbacks by an installation that is inexpensive to install and maintain, in particular by the fact that its electrical equipment is simple, quick to start, able to operate with interruptions without inconvenience, giving more security, because operating at very low voltage, (especially between 5 and 15 volts) improving working conditions, because it does not pollute the atmosphere and does not create noise and makes it possible to achieve better performance than previous installations.
  • the subject of the invention is therefore an installation as defined according to claim 1.
  • these submerged elements are made of non-metallic material, such as graphite or silicon carbide, whose electrical resistivity is higher than that of the metal in which they are immersed, it is the resistant element (s) which preferentially undergo the '' heating by direct current flow.
  • non-metallic material such as graphite or silicon carbide
  • the metal in which the heating element (s) are immersed can be in the liquid, pasty or solid state, the only condition being that there is intimate contact between metal and immersed resistant element: the melting point of the element is higher than that of the metal by at least 100 ° C. preferably and better by at least 200 ° C.
  • the bath heating by plunging electrodes is a known process in which the weak resistance electrodes have the sole purpose of bringing the current to the bath which is itself resistant.
  • the system is reversed by the fact that the submerged element or elements are much more resistant than the metal in which they immerse, the latter having the role of closing the electrical circuit.
  • the cellar 1 or container of the oven is made of thermally insulating refractory material.
  • a resistant element 2 is immersed in the metal 3.
  • the current leads 4 and 5 are connected to the upper faces of the element 2 outside the bath.
  • the leads 4 and 5 are respectively connected to the terminals of the single-phase secondary of a step-down transformer 6 controlled by a regulation 7 suitable for thyristors, variable self or other controlled by sensors such as a pyrometric rod 8 or a telescope 9.
  • the heating is carried out by 3 elements 10, 11 and 12.
  • the current leads 13, 14 and 15 are respectively connected to the terminals of the three-phase secondary of a transformer 16 step-down controlled by a regulation 17 suitable for thyristors, variable inductor or other controlled by sensors such as pyrometric rod 18 or telescope 19 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Resistance Heating (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
EP81400564A 1980-04-09 1981-04-09 Installation et procédé pour fondre ou pour maintenir en fusion une matière métallique par élément résistant immergé dans le métal Expired EP0037788B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81400564T ATE11594T1 (de) 1980-04-09 1981-04-09 Vorrichtung und verfahren zum schmelzen oder fluessighalten von metallen mit hilfe eines elektrischen widerstandstaucheizelementes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8007966A FR2480419A1 (fr) 1980-04-09 1980-04-09 Installation et procede pour fondre ou pour maintenir en fusion une matiere metallique par element resistant immerge dans le metal
FR8007966 1980-04-09

Publications (2)

Publication Number Publication Date
EP0037788A1 EP0037788A1 (fr) 1981-10-14
EP0037788B1 true EP0037788B1 (fr) 1985-01-30

Family

ID=9240681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400564A Expired EP0037788B1 (fr) 1980-04-09 1981-04-09 Installation et procédé pour fondre ou pour maintenir en fusion une matière métallique par élément résistant immergé dans le métal

Country Status (4)

Country Link
EP (1) EP0037788B1 (enExample)
AT (1) ATE11594T1 (enExample)
DE (1) DE3168580D1 (enExample)
FR (1) FR2480419A1 (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3512868A1 (de) * 1985-04-04 1986-10-09 W. Strikfeldt & Koch Gmbh, 5276 Wiehl Ofen, insbesondere schmelz- oder warmhalteofen fuer metall
US6451248B1 (en) * 2001-01-25 2002-09-17 Alcoa, Inc. Pressurized molten metal holder furnace

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR400655A (fr) * 1908-06-15 1909-08-04 Charles Albert Keller Système de réglage des circuits alimentant des fours électriques à électrodes multiples
DE717668C (de) * 1937-06-12 1942-02-20 Siemens Planiawerke Ag Elektroofen mit elektrischen Widerstandsheizkoerpern
US2355761A (en) * 1943-04-23 1944-08-15 Commerce Pattern Foundry & Mac Electrically heated molten bath furnace
DE965835C (de) * 1949-03-22 1957-06-19 Otto Junker Fa Heizvorrichtung fuer elektrische Widerstandsoefen, insbesondere Schmelzoefen
DE1058651B (de) * 1957-04-11 1959-06-04 Hettstedt Walzwerk Heizelement mit einem Widerstandskoerper aus Glas fuer elektrische OEfen
GB1042764A (en) * 1963-05-16 1966-09-14 Morganite Thermal Designs Ltd Improvements in and relating to electrically-heated furnaces
US3518351A (en) * 1968-12-16 1970-06-30 Carborundum Co Heating element

Also Published As

Publication number Publication date
ATE11594T1 (de) 1985-02-15
DE3168580D1 (en) 1985-03-14
EP0037788A1 (fr) 1981-10-14
FR2480419A1 (fr) 1981-10-16
FR2480419B1 (enExample) 1985-02-01

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