EP0230255A2 - Bobine d'induction pour fours à induction à creuset - Google Patents

Bobine d'induction pour fours à induction à creuset Download PDF

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Publication number
EP0230255A2
EP0230255A2 EP87100362A EP87100362A EP0230255A2 EP 0230255 A2 EP0230255 A2 EP 0230255A2 EP 87100362 A EP87100362 A EP 87100362A EP 87100362 A EP87100362 A EP 87100362A EP 0230255 A2 EP0230255 A2 EP 0230255A2
Authority
EP
European Patent Office
Prior art keywords
coil
induction
crucible
cooling
coil sections
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.)
Withdrawn
Application number
EP87100362A
Other languages
German (de)
English (en)
Other versions
EP0230255A3 (fr
Inventor
Dieter Dipl.-Ing. Schluckebier
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.)
Otto Junker GmbH
Original Assignee
Otto Junker GmbH
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 Otto Junker GmbH filed Critical Otto Junker GmbH
Publication of EP0230255A2 publication Critical patent/EP0230255A2/fr
Publication of EP0230255A3 publication Critical patent/EP0230255A3/fr
Withdrawn legal-status Critical Current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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/22—Furnaces without an endless core
    • H05B6/24—Crucible furnaces
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/42—Cooling of coils

Definitions

  • the invention relates to an induction coil for induction crucible furnaces consisting of a plurality of coil sections which can be acted upon independently of one another and arranged coaxially one above the other.
  • Crucible furnaces with several coil sections are known for example from DE-AS 1 037 613.
  • the coil sections made of copper or aluminum profile can be loaded independently of one another, so that the thermal energy can only be supplied to the feed material limited to certain crucible zones.
  • both the loaded and each non-switched-on coil section are cooled by water which is passed through a cooling channel located in the coil profile. In this way, the outer wall of the crucible is cooled approximately uniformly over the entire coil height.
  • the object of the invention is therefore to increase the power consumption in the induction crucible furnaces mentioned at the outset lower and thus improve the overall efficiency of the ovens.
  • an induction coil of the type mentioned in the introduction in that the coil sections are arranged at a distance from one another and are surrounded on the outside by magnetic yokes and in that there is at least one cooling coil made of non-magnetic steel in the intermediate space or in the intermediate spaces between the coil sections.
  • cooling coil is to be understood as a coil section that cannot be connected to the power supply system, the windings of which consist of a hollow profile made of non-magnetic steel connected to a cooling water network. It is generally known to arrange such cooling coils above and below the induction coil in order to be able to cool the upper and lower crucible side wall parts which are not covered by the induction coil and thus to prevent thermal stress cracks in the crucible lining.
  • the induction coil according to the invention can also be designed so that each cooling coil consists of several turns and has a height of 100 to 250 mm.
  • the induction coil according to the invention can improve the overall efficiency by up to 8% if the sub-coils are operated at the mains frequency. With a medium frequency connection, an even higher improvement in the overall efficiency is achieved.
  • the furnace crucible made of ceramic ramming mass is designated 1. This is surrounded in its lower part by the lower coil section 2 and in its upper part by the upper coil section 3. Both coil sections 2 and 3 can be connected independently of one another to a suitable power network. Both coil sections 2, 3 are connected to a cooling water network via connections not shown in the drawing.
  • the lower coil section 2 and the upper coil section 3 are spaced apart. In the resulting space there is a cooling coil 4 with several cooling windings made of non-magnetic hollow steel profile.
  • the cooling coil 4 can also be connected to a cooling water network. However, it is not connected to a power grid.
  • the coil sections 2, 3 and the cooling coil 4 are surrounded on the outside by perpendicularly arranged magnetic yokes 5 for returning the electric field of the induction coil consisting of the coil sections 2, 3.
  • the crucible 1 is surrounded by three coil sections 6, 7, 8 which can be acted upon independently of one another and two cooling coils 9, 10.
  • Yokes 5 are also present in this exemplary embodiment.
  • the distance between the coil sections 2, 3, 6, 7, 8 which can be acted upon independently of one another or the height of the cooling coils 4, 9, 10 is 100 to 250 mm, depending on the choice of frequency and other factors. This means that copper and aluminum can be loaded independently of one another placed coil sections outside the main electrical field of the adjacent coil sections. Since the cooling coils 4, 9, 10 consist of non-magnetic steel, no or hardly any thermal energy is induced in them from the electrical field of the coil sections.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Furnace Details (AREA)
EP87100362A 1986-01-16 1987-01-14 Bobine d'induction pour fours à induction à creuset Withdrawn EP0230255A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8600893U 1986-01-16
DE19868600893 DE8600893U1 (de) 1986-01-16 1986-01-16 Induktionsspule für Induktionstiegelöfen

Publications (2)

Publication Number Publication Date
EP0230255A2 true EP0230255A2 (fr) 1987-07-29
EP0230255A3 EP0230255A3 (fr) 1988-03-09

Family

ID=6790598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87100362A Withdrawn EP0230255A3 (fr) 1986-01-16 1987-01-14 Bobine d'induction pour fours à induction à creuset

Country Status (2)

Country Link
EP (1) EP0230255A3 (fr)
DE (1) DE8600893U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH680198A5 (fr) * 1990-07-06 1992-07-15 Sulzer Ag

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR817998A (fr) * 1936-02-17 1937-09-15 Union Aciers Fins Four à induction à haute et à basse fréquence
FR894271A (fr) * 1942-05-02 1944-12-19 Ind Termo Elettro Meccanica G Four électrique à induction fonctionnant en courant triphasé à fréquence industrielle pour la fusion des métaux et alliages légers
DE1037613B (de) * 1952-05-20 1958-08-28 Otto Junker Fa Verfahren zum Einschmelzen loser, kleinstueckiger Metallteile

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH680198A5 (fr) * 1990-07-06 1992-07-15 Sulzer Ag
EP0465406A3 (en) * 1990-07-06 1992-09-02 Gebrueder Sulzer Aktiengesellschaft Process for the continous melting of solid or viscous products

Also Published As

Publication number Publication date
DE8600893U1 (de) 1986-03-06
EP0230255A3 (fr) 1988-03-09

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Inventor name: SCHLUCKEBIER, DIETER, DIPL.-ING.