EP0311506A1 - Schmelztiegel für einen Induktionsofen - Google Patents

Schmelztiegel für einen Induktionsofen Download PDF

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Publication number
EP0311506A1
EP0311506A1 EP88402505A EP88402505A EP0311506A1 EP 0311506 A1 EP0311506 A1 EP 0311506A1 EP 88402505 A EP88402505 A EP 88402505A EP 88402505 A EP88402505 A EP 88402505A EP 0311506 A1 EP0311506 A1 EP 0311506A1
Authority
EP
European Patent Office
Prior art keywords
crucible
elements
conduits
induction furnace
conductive material
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
EP88402505A
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English (en)
French (fr)
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EP0311506B1 (de
Inventor
Roger Boen
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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Application filed by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0311506A1 publication Critical patent/EP0311506A1/de
Application granted granted Critical
Publication of EP0311506B1 publication Critical patent/EP0311506B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • H05B6/22—Furnaces without an endless core

Definitions

  • the present invention relates to a particular construction of an induction furnace crucible of the type made of an electrically conductive material, such as copper, surrounded externally by an induction coil.
  • the cylindrical wall of such crucibles is subjected to significant overheating both because of the molten charge which it surrounds and as clearances by Joule effect due to the induced currents of which it is the seat. It is therefore important to limit these overheating by inserting cooling circuits inside the wall.
  • the obligation to limit the currents induced in this same wall which, in addition to the thermal losses which they produce, also create an electromagnetic decoupling between the turn and the load, means that the wall consists of the assembly of longitudinal elements by their transverse faces, like a barrel stave, with an electrical insulating joint between two adjacent elements.
  • Figure 1 shows in perspective and partial section one of these crucibles already known.
  • the inductor 1 is a turn wound around longitudinal elements 2 which have a section in the form of a crown sector which embraces an angle C ′. They are assembled by their transverse faces 3 to form the cylindrical wall of a crucible, which further comprises a bottom which does not appear in the figure. Seals 4 of electrical insulating material are interposed between the adjacent elements 2 and are pressed between the transverse faces 3.
  • the elements 2 each contain a hydraulic cooling circuit which is here a U-shaped duct 5 which extends over all their length.
  • One of its branches 6 communicates with a water supply pipe 8, the other branch 7 with a water discharge pipe 9.
  • the cooling water therefore travels successively through the two branches 6 and 7 of the conduit in U 5.
  • the two branches 6 and 7 are located on the same circumference, halfway between the external and internal surfaces of the cylindrical wall of the crucible.
  • the angle C ′ of the elements 2 must therefore be sufficient to embrace the two branches; here it is 24 °, when we would like it to be as small as possible.
  • the invention overcomes these drawbacks by overcoming the prejudice that the elements 2 must each be cooled by an independent circuit. It shows that it is perfectly possible to have circumferential cooling circuits which pass in turn through several elements 2. The seals 4 can indeed perfectly seal.
  • the invention therefore relates to a crucible made of an electrically conductive material of an induction furnace consisting of longitudinal elements assembled together according to their transverse faces by means of electrical insulating joints, characterized in that the elements are pierced with conduits leading to their transverse faces and opening onto similar conduits of the elements to which they are assembled, and in that the seals are impervious to coolants passing through the conduits.
  • the inductor 1 of FIGS. 2A and 2B is the same as in the preceding figure, and there are longitudinal elements 12 in the form of crown sectors which embrace an angle C much less than the angle C ′ in FIG. 1: approximately one or two degrees. It can be seen that the elements 12 then have a greater thickness than their width between their transverse faces 13, which means that the currents induced by the inductor 1 cannot develop there and that the electromagnetic losses, as well as the heating which they produce by Joule effect, are very reduced. Indeed, electrical insulating joints 14 are interposed as before between adjacent longitudinal elements 12.
  • the seals 14 must be drilled in front of the conduits 15, and at the same time prevent leaks between the cooling network and the outside, that is to say seal.
  • FIG 3 shows a possible embodiment of the invention.
  • the wall of the crucible is cut diametrically.
  • the elements 12 have a lower heel 16 which is in the form of a projection 17 of their external surface and of a reentrant 18 of their internal surface.
  • the cooling network made up of the channels 15 here forms two nested propellers 15 ′ and 15 ⁇ , each of which opens at its lower end into a cylindrical supply water box 19 on which the reentrants 18 fit together, and at its upper end in a cylindrical drainage water box 20 which fits around the upper edge 21 of the elements 12.
  • the drainage water box 20 is supported on the upper edge 22 of a coating ring 23 disposed around the elements 12 and which is itself supported on the projections 17. It is electrically insulating such that the fiberglass.
  • conduits 15 can form any number of helices, which is only limited by reasons of ease of construction.
  • FIG. 4 represents another possible embodiment of the invention, which differs from the previous one in that the hydraulic circuit is formed this time of several horizontal channels 30 which each extend over a circumference of the cylindrical wall.
  • a longitudinal element 32 of particular shape is then provided, possibly of greater angular extension than the others, the section of which is in the shape of an H and which thus comprises an internal wall 33, an external wall 34 and a median cross-member 35 connecting the two walls 33 and 34.
  • the cross-piece separates two vertical channels 36 and 37; one of them 36, on the right in the drawing, is traversed by the cooling water arriving from a supply pipe 38 and distributes this water in the horizontal channels 30; the other, 37, on the left in the drawing, collects and collects the water which has passed through the horizontal channels 30 before drain it through a drain hose 39.
  • FIG. 5 A particular advantage of the invention appears in Figure 5.
  • longitudinal elements 42 having a cylindrical upper part 43 connecting to a lower part 44 widening downwards from the inside can perfectly be envisaged: the volume occupied by the molten charge is then cylindro-conical with the point of the cone at the bottom and it leads to a drain neck 45 of small diameter delimited by the lower parts 44.
  • These longitudinal elements 12 have a much narrower width near the drain neck 45. It is however possible to cool them at this location by gradually increasing the width (radial dimension) of the section of the cooling conduits 15 for those located downwards.
  • the arrangement of the conduits 15 in through channels therefore presents a double advantage: it is possible either to reduce the losses in the crucible by constructing it with thinner and numerous elements, or to ensure the cooling of narrowed zones.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP88402505A 1987-10-06 1988-10-04 Schmelztiegel für einen Induktionsofen Expired - Lifetime EP0311506B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8713778 1987-10-06
FR8713778A FR2621387B1 (fr) 1987-10-06 1987-10-06 Creuset de four a induction

Publications (2)

Publication Number Publication Date
EP0311506A1 true EP0311506A1 (de) 1989-04-12
EP0311506B1 EP0311506B1 (de) 1993-04-21

Family

ID=9355552

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88402505A Expired - Lifetime EP0311506B1 (de) 1987-10-06 1988-10-04 Schmelztiegel für einen Induktionsofen

Country Status (5)

Country Link
US (1) US4873698A (de)
EP (1) EP0311506B1 (de)
JP (1) JP2660018B2 (de)
DE (1) DE3880416T2 (de)
FR (1) FR2621387B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0439900A2 (de) * 1990-01-31 1991-08-07 Inductotherm Corp. Induktionsheizgerät und Verfahren
EP0467230A1 (de) * 1990-07-16 1992-01-22 Forschungszentrum Jülich Gmbh Kalt-Schmelz-Tiegel
FR2665249A1 (fr) * 1990-07-26 1992-01-31 Dauphine Ets Bonmartin Laminoi Four de fusion par induction en creuset froid.
EP0512466A1 (de) * 1991-05-10 1992-11-11 ABBPATENT GmbH Magnetischer Rückschluss für einen Induktionstiegelofen
EP0539051A1 (de) * 1991-10-21 1993-04-28 General Electric Company Verfahren und Vorrichtung zur direkten Weiterverarbeitung von durch Elektroschlackeumschmelzen gereinigten Materialien
US5257281A (en) * 1990-01-31 1993-10-26 Inductotherm Corp. Induction heating apparatus and method

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3910777C2 (de) * 1989-04-04 2001-08-09 Ald Vacuum Techn Ag Induktionsofen mit einem metallischen Tiegel
DE3940029C2 (de) * 1989-12-04 1994-04-14 Leybold Ag Tiegel für die induktive Erwärmung
US5550353A (en) * 1990-01-31 1996-08-27 Inductotherm Corp. Induction heating coil assembly for prevent of circulating current in induction heating lines for continuous-cast products
US5272718A (en) * 1990-04-09 1993-12-21 Leybold Aktiengesellschaft Method and apparatus for forming a stream of molten material
US5090022A (en) * 1990-05-21 1992-02-18 Inductotherm Corp. Cold crucible induction furnace
DE4102101C2 (de) * 1991-01-25 2003-12-18 Ald Vacuum Techn Ag Einrichtung zum Herstellen von Pulvern aus Metallen
WO1992015531A1 (fr) * 1991-03-05 1992-09-17 Commissariat A L'energie Atomique Four de fusion en continu de melanges d'oxydes par induction directe a haute frequence a temps d'affinage tres court et a faible consommation en energie
JP3287031B2 (ja) * 1991-10-16 2002-05-27 神鋼電機株式会社 コールドウォール誘導溶解ルツボ炉
EP0541882B1 (de) * 1991-11-12 1997-04-23 COMPUPRINT S.p.A. Elektrofotografischer Drucker mit verbesserten Eigenschaften für gedruckte Bilder
JP2967092B2 (ja) * 1991-12-20 1999-10-25 科学技術庁金属材料技術研究所長 浮上溶解装置
JP3047056B2 (ja) * 1992-06-02 2000-05-29 科学技術庁金属材料技術研究所長 浮上溶解装置とその運転方法
DE4320766C2 (de) * 1993-06-23 2002-06-27 Ald Vacuum Techn Ag Vorrichtung zum Einschmelzen einer festen Schicht aus elektrisch leitfähigem Material
DE4429340C2 (de) * 1994-08-18 2003-04-30 Ald Vacuum Techn Ag Tiegel zum induktiven Schmelzen oder Überhitzen von Metallen, Legierungen oder anderen elektrisch leitfähigen Werkstoffen
US5992503A (en) * 1995-12-21 1999-11-30 General Electric Company Systems and methods for maintaining effective insulation between copper segments during electroslag refining process
US6192969B1 (en) 1999-03-22 2001-02-27 Asarco Incorporated Casting of high purity oxygen free copper
KR101307745B1 (ko) * 2012-02-14 2013-09-11 한국수력원자력 주식회사 냉각흐름이 개선된 저온용융로

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE886353C (de) * 1941-09-04 1953-08-13 Vacuumschmelze Ag Bodenplatte fuer Induktionsoefen, insbesondere fuer kernlose Induktionsoefen
DE2100378A1 (de) * 1970-01-09 1971-07-22 Hukin D Tiegel
EP0056915A1 (de) * 1980-12-23 1982-08-04 Societe D'applications De La Physique Moderne Et De L'electronique Saphymo-Stel Anlage zum direkten Induktionsschmelzen in einem gekühlten Tiegel mit zusätzlicher elektromagnetischer Halterung des Schmelzgutes
EP0079266A1 (de) * 1981-11-06 1983-05-18 Societe D'applications De La Physique Moderne Et De L'electronique Saphymo-Stel Einrichtung zum Induktionsschmelzen von dielektrischen Substanzen wie z.B. Glas oder Email

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE866353C (de) * 1943-02-13 1953-02-09 Dortmunder Union Brueckenbau A Zerlegbare Bruecke
GB1118505A (en) * 1966-01-28 1968-07-03 Standard Telephones Cables Ltd Improvements in or relating to apparatus for the heat treatment of electrically conductive materials
FR1492063A (fr) * 1966-04-05 1967-08-18 Commissariat Energie Atomique Perfectionnement aux fours électriques haute fréquence pour la fabrication en continu de réfractaires électrofondus
FR2036418A5 (de) * 1969-03-13 1970-12-24 Commissariat Energie Atomique
DE2110037C3 (de) * 1971-03-03 1980-05-14 Gebr. Happich Gmbh, 5600 Wuppertal Abdeckleiste zum Aufklipsen auf Rahmen oder Sprossen, insbesondere in Innenräumen von Fahrzeugen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE886353C (de) * 1941-09-04 1953-08-13 Vacuumschmelze Ag Bodenplatte fuer Induktionsoefen, insbesondere fuer kernlose Induktionsoefen
DE2100378A1 (de) * 1970-01-09 1971-07-22 Hukin D Tiegel
EP0056915A1 (de) * 1980-12-23 1982-08-04 Societe D'applications De La Physique Moderne Et De L'electronique Saphymo-Stel Anlage zum direkten Induktionsschmelzen in einem gekühlten Tiegel mit zusätzlicher elektromagnetischer Halterung des Schmelzgutes
EP0079266A1 (de) * 1981-11-06 1983-05-18 Societe D'applications De La Physique Moderne Et De L'electronique Saphymo-Stel Einrichtung zum Induktionsschmelzen von dielektrischen Substanzen wie z.B. Glas oder Email

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0439900A2 (de) * 1990-01-31 1991-08-07 Inductotherm Corp. Induktionsheizgerät und Verfahren
EP0439900A3 (en) * 1990-01-31 1993-03-03 Inductotherm Corp. Induction heating apparatus and method
US5257281A (en) * 1990-01-31 1993-10-26 Inductotherm Corp. Induction heating apparatus and method
EP0467230A1 (de) * 1990-07-16 1992-01-22 Forschungszentrum Jülich Gmbh Kalt-Schmelz-Tiegel
FR2665249A1 (fr) * 1990-07-26 1992-01-31 Dauphine Ets Bonmartin Laminoi Four de fusion par induction en creuset froid.
EP0480845A1 (de) * 1990-07-26 1992-04-15 LAMINOIRS DU DAUPHINE ETABLISSEMENTS BONMARTIN Société anonyme dite : Induktionsschmelzofen mit kaltem Tiegel
EP0512466A1 (de) * 1991-05-10 1992-11-11 ABBPATENT GmbH Magnetischer Rückschluss für einen Induktionstiegelofen
US5247539A (en) * 1991-05-10 1993-09-21 Abb Patent Gmbh Magnetic yoke for an induction crucible furnace
EP0539051A1 (de) * 1991-10-21 1993-04-28 General Electric Company Verfahren und Vorrichtung zur direkten Weiterverarbeitung von durch Elektroschlackeumschmelzen gereinigten Materialien

Also Published As

Publication number Publication date
JPH01118089A (ja) 1989-05-10
EP0311506B1 (de) 1993-04-21
DE3880416D1 (de) 1993-05-27
FR2621387A1 (fr) 1989-04-07
JP2660018B2 (ja) 1997-10-08
FR2621387B1 (fr) 1990-01-05
DE3880416T2 (de) 1993-10-14
US4873698A (en) 1989-10-10

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