EP3345453A1 - Induction crucible furnace and magnetic return element therefor - Google Patents

Induction crucible furnace and magnetic return element therefor

Info

Publication number
EP3345453A1
EP3345453A1 EP16790512.4A EP16790512A EP3345453A1 EP 3345453 A1 EP3345453 A1 EP 3345453A1 EP 16790512 A EP16790512 A EP 16790512A EP 3345453 A1 EP3345453 A1 EP 3345453A1
Authority
EP
European Patent Office
Prior art keywords
crucible furnace
induction crucible
arrangement
furnace according
rods
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
EP16790512.4A
Other languages
German (de)
French (fr)
Other versions
EP3345453B1 (en
Inventor
Till SCHREITER
Axel WALTHER
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.)
ABP Induction Systems GmbH
Original Assignee
ABP Induction Systems 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 ABP Induction Systems GmbH filed Critical ABP Induction Systems GmbH
Publication of EP3345453A1 publication Critical patent/EP3345453A1/en
Application granted granted Critical
Publication of EP3345453B1 publication Critical patent/EP3345453B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H05B6/36—Coil arrangements
    • H05B6/365—Coil arrangements using supplementary conductive or ferromagnetic pieces
    • 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
    • F27B14/061—Induction furnaces
    • F27B14/063—Skull melting type
    • 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
    • H05B6/367—Coil arrangements for melting furnaces
    • 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
    • F27B14/08—Details peculiar to crucible or pot furnaces
    • F27B2014/0862—Flux guides
    • 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
    • F27B14/08—Details peculiar to crucible or pot furnaces
    • F27B14/10—Crucibles
    • F27B2014/102—Form of the crucibles

Definitions

  • the present invention relates to an induction crucible furnace having a refractory cylindrical crucible, a cylindrical spool extending around the crucible and a plurality of magnetic recesses formed as individual units circumferentially spaced on the outer surface of the spool, each for guiding the crucible magnetic flux produced by the coil comprise an array of a plurality of elongated individual elements of magnetically permeable material which are electrically insulated from one another and extend parallel to the furnace axis.
  • Induction crucible furnaces for melting metals by generating magnetic fields which generate eddy currents in the metal and heat it are known. It is also known to provide such induction crucible furnaces with magnetic recesses, which are arranged on the outer circumferential surface of the coil with circumferential spacing. During operation of the furnace, the alternating current flowing through the coil generates an alternating magnetic field which is inside the furnace crucible is guided through the metal feedstock and outside the coil through the individual elements of the magnetic conclusions. The alternating magnetic field induces eddy currents in the magnetic input material, which are converted into heat.
  • An induction crucible furnace of the type described in the introduction is known from EP 0 512 466 B1.
  • the magnetic conclusions are in this case arranged on the outside of the coil in the form of individual distributed over the circumference of the coil with gaps individual packets parallel to the furnace axis.
  • the individual elements here consist of iron sheets and form iron sheet packages, which have the purpose to guide the magnetic alternating flux.
  • the magnetic flux should be offered a path of low magnetic resistance, which causes only small eddy current losses at the same time.
  • the material carrying the alternating flow must have a high permeability and low eddy current losses.
  • Common to this is a structure of correspondingly thin, electrically insulated from each other transformer plates with high electrical resistivity. These sheets extend in the radial direction from the outer circumferential surface of the coil.
  • EP 0 876 084 B1 discloses an induction furnace in which the coil is surrounded by a layer of metallic and magnetically permeable material, this layer essentially consisting of a plurality of discrete, non-powdered elements bonded in an electrically non-conductive matrix.
  • the layer in this case extends completely around the circumference of the oven coil, and the elements are preferably spherically formed elements.
  • the present invention has for its object to provide an induction crucible furnace of the type described above, which has a particularly simple and inexpensive construction with respect to its magnetic conclusions.
  • an induction crucible furnace of the specified type in that the individual elements at least partially from electrically against each other insulated rods whose longitudinal axes are parallel to the furnace axis, the arrangement both in the radial direction and in the circumferential direction of the coil at least two rods having.
  • Characteristic in the prior art is that those field lines that emerge in the radial direction of the crucible furnace, are absorbed by the magnetic yoke and fed from the coil start to the coil end.
  • the design with the correspondingly thin, electrically insulated transformer plates minimizes the formation of eddy currents.
  • a disadvantage of this prior art is that those field lines which impinge from an azimuthal direction (circumferential direction), ie with a transverse component, on the said transformer sheets or electrical sheets, cause corresponding eddy currents, with the result of additional heating of the electrical sheet. Through this. In addition to heating, water cooling of the magnetic yoke may be necessary or required to an increased degree.
  • the arrangement has at least two rods in both the radial direction and in the circumferential direction of the coil, as a result of which the above-described effect of reducing eddy currents in both directions, ie radially and azimuthally, is reduced.
  • the rods used in the invention are electrically isolated against each other ⁇ ge.
  • the rods which consist of magnetically permeable material, in particular metallic material such as iron, have a coating of electrically insulating material which is produced, for example, by a dipping method.
  • a dipping method for this purpose, for example, find suitable and known plastics application.
  • a plurality of such rods are used, which have correspondingly small dimensions, for example in a range of 0.35 x 0.35 to 0.35 x 80 mm in cross section (dimension in the circumferential direction x dimension in the radial direction).
  • the at least two rods may have a different cross-sectional shape.
  • the arrangement of individual elements consists entirely of bars insulated against each other.
  • the arrangement consists partly of sheets and partly of rods.
  • the arrangement preferably has a central area consisting of sheets and two lateral outside areas consisting of bars.
  • the resulting eddy currents in the central region which can cause additional heating of the sheets, are selectively prevented or at least reduced by the bars provided in the outer regions.
  • the magnetic conclusions arranged around the circumference of the furnace coil are fixed to the outer circumferential surface of the furnace coil.
  • the arrangement of a respective yoke has a fastening device which fixes the arrangement on the outer circumferential surface of the coil.
  • a mechanical fastening device is preferably designed as a supporting body, which can surround the arrangement of the individual elements preferably on all sides and above and below. In this support body, the arrangement of the individual elements can be pressed, glued or poured.
  • the bars and the sheets, if present, with a material, in particular synthetic resin may be cast into a complete package.
  • This overall package can be cast for example in the support body or used as an insert in the support body and fixed in this.
  • the individual elements are provided closely adjacent to each other in the package or in the arrangement.
  • the cross-sectional shape of the rods are preferably rectangular in cross-section, in particular square.
  • the rods are round in cross-section, for example circular, elliptical, etc., or as a polygon.
  • an additional cooling of the return path in particular a water cooling arranged on the sides of the arrangement, can be avoided.
  • the arrangement of the individual elements is associated with a cooling device, in particular on the side surfaces.
  • the elongated individual elements of the arrangement which are electrically insulated from one another and extend parallel to the furnace axis, are designed such that rods are provided only in the upper and / or lower region, while sections with a larger cross section are located in the remaining region ,
  • This embodiment makes use of the knowledge that the magnetic flux density which strikes the magnetic return with a transverse component has a relative maximum value at the upper and / or lower end of the return path. Therefore, the eddy currents are greatest at these points.
  • the arrangement has elongate individual elements which extend in the upper and / or lower region through parallel to the furnace axis
  • Slots formed bars include.
  • slotted individual elements are used, which are preferably slotted at the top and at the bottom.
  • the slots may extend in the circumferential direction of the crucible furnace and / or in the radial direction thereof.
  • Particularly preferred is an embodiment in which the arrangement has radially arranged plates which extend in the upper and / or lower region through in the circumferential direction
  • Slots formed bars include. These sheets may be provided partially or entirely at the top and / or bottom with at least one slot in order to provide the inventively desired bars in these areas.
  • the rods therefore do not have to be formed continuously in the vertical direction. Rather, the individual elements may also be formed as rods only over a part of their longitudinal extension, specifically only over the upper and / or lower part, while the remaining part of the individual elements has a larger cross-section.
  • the rods provided according to the invention are electrically insulated from one another. In this case, the electrical insulation can be realized for example by an air gap or by any insulating material.
  • the term "electrically isolated” is therefore intended to cover all possible types of insulation.
  • the invention further relates to a magnetic return for an induction crucible furnace of the type described above. The invention will be explained in more detail below with reference to exemplary embodiments in conjunction with the drawing. Show it:
  • FIG. 1 shows a horizontal section through a part of an induction crucible furnace, showing a magnetic inference of the furnace, in one embodiment of the prior art
  • Figure 2 is a similar view as Figure 1 with a first embodiment of the invention
  • a corresponding representation as Figure 1 with a second embodiment of the invention
  • a vertical section through a portion of another embodiment of a magnetic induction induction crucible furnace
  • Figure 5 is an enlarged view of the upper part of the magnetic yoke of Figure 4.
  • FIG. 6 is a schematic front view of the magnetic see conclusions of the figures 4 and 5.
  • Figure 1 shows a horizontal section through a part ei ⁇ ner coil 1, a crucible (not shown) surrounds a crucible furnace in- duction.
  • a crucible (not shown) surrounds a crucible furnace in- duction.
  • These magnetic inferences 2 are in the form of individual units arranged on the outer circumferential surface of the coil 1 with circumferential spacing, each of which is arranged to guide the magnetic flux generated by the coil 1 from a plurality of electrically mutually insulated and parallel to the furnace axis comprise elongated individual elements of magnetically permeable material.
  • this is an arrangement 3 of a plurality of electrically insulated from each other and mutually parallel thin electric sheets extending substantially in the radial direction of the furnace coil 1 from.
  • This arrangement 3 of electrical sheets is located within a support body 5, which surrounds all sides of the assembly 3, including the top and bottom. In this case, the arrangement 3 of electrical sheets is pressed into the carrier body 5.
  • FIG. 2 shows a corresponding embodiment in which the magnetic yoke 2 is formed according to the invention.
  • the yoke 2 is arranged in contact with the outer surface of the furnace coil 1 and is basically composed of an array 3 of individual elements. Of these individual elements, only the central part is formed of thin electrical sheets, while the two lateral outer portions 6 consist of electrically mutually insulated bars whose longitudinal axes are parallel to the furnace axis.
  • FIG. 3 shows a corresponding embodiment of a magnetic yoke, in which the entire assembly 3 is formed from electrically mutually insulated rods 7, whose longitudinal axes are parallel to the furnace axis.
  • the rods 7 are in this embodiment with a
  • FIGS. 4 to 6 show a further embodiment of an induction crucible furnace with magnetic inference.
  • a crucible furnace 10 schematically illustrated with induction coil 1.
  • a magnetic yoke 2 which in this embodiment comprises an arrangement 3 of plates extending in the radial direction and arranged parallel to one another. These sheets are divided at its upper and at its lower end by extending in the circumferential direction of the crucible furnace 10 slots 11 into individual bars 7, which is electrically isolated from each other as in the previous embodiments bars.
  • a sheet is divided by slots 11 into four juxtaposed rods 7, both at the top and at the bottom. These rods 7 are provided where the largest eddy currents occur.
  • FIG. 6 shows a schematic front view of the return yoke 2 with the arrangement 3 of individual elements which comprise mutually parallel and radially arranged plates which are divided into bars 7 at the upper and lower ends, respectively.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • General Induction Heating (AREA)
  • Furnace Details (AREA)

Abstract

The invention relates to an induction crucible furnace and to a magnetic return element for an induction crucible furnace. The induction crucible furnace has a corresponding coil and a plurality of magnetic return elements, which are designed in the form of individual units arranged on the outer lateral surface of the coil with peripheral spacing. In order to guide the magnetic flux produced by the coil, the magnetic return elements each have an assembly consisting of a plurality of elongate individual elements of magnetically permeable material that are electrically insulated from each other and extend parallel to the furnace axis. Said individual elements consist at least partially of bars, which are electrically insulated from each other and the longitudinal axes of which extend parallel to the furnace axis. In this way, both eddy currents that hit the assembly from the radial direction and eddy currents that hit the assembly with a transverse component are minimized.

Description

Induktionstiegelofen und magnetischer Rückschluss hierfür  Induction crucible furnace and magnetic conclusion for this
Die vorliegende Erfindung betrifft einen Induktionstiegelofen mit einem feuerfesten zylinderförmigen Tiegel, einer zylinderförmigen sich um den Tiegel erstreckenden Spule und einer Vielzahl von magnetischen Rückschlüssen, die in Form einzelner an der Außenmantelfläche der Spule mit Umfangsab- stand angeordneter Einheiten ausgebildet sind, die jeweils zur Führung des von der Spule erzeugten magnetischen Flusses eine Anordnung aus einer Vielzahl von elektrisch gegen- einander isolierten und sich parallel zur Ofenachse erstreckenden länglichen Einzelelementen aus magnetisch permeablem Material umfassen. The present invention relates to an induction crucible furnace having a refractory cylindrical crucible, a cylindrical spool extending around the crucible and a plurality of magnetic recesses formed as individual units circumferentially spaced on the outer surface of the spool, each for guiding the crucible magnetic flux produced by the coil comprise an array of a plurality of elongated individual elements of magnetically permeable material which are electrically insulated from one another and extend parallel to the furnace axis.
Induktionstiegelöfen zum Schmelzen von Metallen durch die Erzeugung von Magnetfeldern, welche Wirbelströme in dem Metall erzeugen und es aufheizen, sind bekannt. Es ist ferner bekannt, derartige Induktionstiegelöfen mit magnetischen Rückschlüssen zu versehen, die an der Außenmantelfläche der Spule mit Umfangsabstand angeordnet sind. Im Betrieb des Ofens erzeugt der durch die Spule fließende Wechselstrom ein magnetisches Wechselfeld, das innerhalb des Ofentiegels durch das metallene Einsatzmaterial und außerhalb der Spule durch die Einzelelemente der magnetischen Rückschlüsse geführt wird. Das magnetische Wechselfeld induziert im magnetischen Einsatzmaterial Wirbelströme, die in Wärme umge- setzt werden. Induction crucible furnaces for melting metals by generating magnetic fields which generate eddy currents in the metal and heat it are known. It is also known to provide such induction crucible furnaces with magnetic recesses, which are arranged on the outer circumferential surface of the coil with circumferential spacing. During operation of the furnace, the alternating current flowing through the coil generates an alternating magnetic field which is inside the furnace crucible is guided through the metal feedstock and outside the coil through the individual elements of the magnetic conclusions. The alternating magnetic field induces eddy currents in the magnetic input material, which are converted into heat.
Ein Induktionstiegelofen der eingangs beschriebenen Art ist aus der EP 0 512 466 Bl bekannt. Die magnetischen Rückschlüsse sind hierbei auf der Außenseite der Spule in Form einzelner über den Umfang der Spule mit Zwischenräumen verteilter Einzelpakete parallel zur Ofenachse angeordnet. Die Einzelelemente bestehen hierbei aus Eisenblechen und bilden Eisenblechpakete, die den Zweck haben, den magnetischen Wechselfluss zu führen. Dabei soll dem magnetischen Fluss ein Weg geringen magnetischen Widerstandes geboten werden, der gleichzeitig nur geringe Wirbelstromverluste verursacht . An induction crucible furnace of the type described in the introduction is known from EP 0 512 466 B1. The magnetic conclusions are in this case arranged on the outside of the coil in the form of individual distributed over the circumference of the coil with gaps individual packets parallel to the furnace axis. The individual elements here consist of iron sheets and form iron sheet packages, which have the purpose to guide the magnetic alternating flux. The magnetic flux should be offered a path of low magnetic resistance, which causes only small eddy current losses at the same time.
Das den Wechselfluss führende Material muss eine hohe Per- meabilität und geringe Wirbelstromverluste aufweisen. Üblich ist hierfür ein Aufbau aus entsprechend dünnen, elektrisch voneinander isolierten Transformatorblechen mit hohem spezifischen elektrischen Widerstand. Diese Bleche erstrecken sich dabei in radialer Richtung von der Außenmantel- fläche der Spule aus. The material carrying the alternating flow must have a high permeability and low eddy current losses. Common to this is a structure of correspondingly thin, electrically insulated from each other transformer plates with high electrical resistivity. These sheets extend in the radial direction from the outer circumferential surface of the coil.
Entsprechend ausgebildete magnetische Rückschlüsse sind aus der EP 0 563 802 A2, der DE 42 10 374 AI, der DE 41 15 278 AI und der EP 0 688 145 A2 bekannt. Aus der EP 0 876 084 Bl ist ein Induktionsofen bekannt, bei dem die Spule von einer Schicht aus metallischem und magnetisch permeablen Material umgeben ist, wobei diese Schicht im Wesentlichen aus mehreren diskreten, nichtgepulverten Elementen besteht, die in einer elektrisch nichtleitenden Matrix gebunden sind. Die Schicht erstreckt sich hierbei vollständig um den Umfang der Ofenspule herum, und bei den Elementen handelt es sich vorzugsweise um sphärisch ausgebildete Elemente. Correspondingly formed magnetic inferences are known from EP 0 563 802 A2, DE 42 10 374 A1, DE 41 15 278 A1 and EP 0 688 145 A2. EP 0 876 084 B1 discloses an induction furnace in which the coil is surrounded by a layer of metallic and magnetically permeable material, this layer essentially consisting of a plurality of discrete, non-powdered elements bonded in an electrically non-conductive matrix. The layer in this case extends completely around the circumference of the oven coil, and the elements are preferably spherically formed elements.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Induktionstiegelofen der eingangs beschriebenen Art zu schaffen, der in Bezug auf seine magnetischen Rückschlüsse einen besonders einfachen und kostengünstigen Aufbau auf- weist. The present invention has for its object to provide an induction crucible furnace of the type described above, which has a particularly simple and inexpensive construction with respect to its magnetic conclusions.
Diese Aufgabe wird erfindungsgemäß bei einem Induktionstiegelofen der angegebenen Art dadurch gelöst, dass die Einzelelemente zumindest teilweise aus elektrisch gegeneinan- der isolierten Stäben bestehen, deren Längsachsen parallel zur Ofenachse verlaufen, wobei die Anordnung sowohl in radialer Richtung als auch in Umfangsrichtung der Spule mindestens zwei Stäbe aufweist. Kennzeichnend beim Stand der Technik ist, dass diejenigen Feldlinien, die in radialer Richtung aus dem Tiegelofen austreten, durch den magnetischen Rückschluss aufgenommen und vom Spulenanfang zum Spulenende geführt werden. Durch die Ausführung mit den entsprechend dünnen, elektrisch ge- geneinander isolierten Trafoblechen wird die Entstehung von Wirbelströmen minimiert. Nachteilig bei diesem Stand der Technik ist jedoch, dass diejenigen Feldlinien, die aus einer azimutalen Richtung (Umfangsrichtung) , d.h. mit einer Querkomponente, auf die besagten Trafobleche bzw. Elektrobleche auftreffen, entsprechende Wirbelströme mit der Folge einer zusätzlichen Erwärmung des Elektrobleches verursachen. Durch diese zu- . sätzliche Erwärmung kann eine Wasserkühlung des magnetischen Rückschlusses erforderlich bzw. in erhöhtem Maß er- forderlich werden. This object is achieved according to the invention in an induction crucible furnace of the specified type in that the individual elements at least partially from electrically against each other insulated rods whose longitudinal axes are parallel to the furnace axis, the arrangement both in the radial direction and in the circumferential direction of the coil at least two rods having. Characteristic in the prior art is that those field lines that emerge in the radial direction of the crucible furnace, are absorbed by the magnetic yoke and fed from the coil start to the coil end. The design with the correspondingly thin, electrically insulated transformer plates minimizes the formation of eddy currents. A disadvantage of this prior art, however, is that those field lines which impinge from an azimuthal direction (circumferential direction), ie with a transverse component, on the said transformer sheets or electrical sheets, cause corresponding eddy currents, with the result of additional heating of the electrical sheet. Through this. In addition to heating, water cooling of the magnetic yoke may be necessary or required to an increased degree.
Demgegenüber werden mit der erfindungsgemäßen Lösung die Kosten und der Platzbedarf am magnetischen Rückfluss reduziert. Insbesondere gelingt es, eine zusätzliche Kühlung ganz oder zumindest teilweise zu vermeiden. Hierzu werden die beim Stand der Technik vorgesehenen Elektrobleche ganz oder teilweise durch gegeneinander elektrisch isolierte Stäbe ersetzt. Hierdurch werden sowohl Wirbelströme, die aus radialer Richtung auf die Anordnung der Einzelelemente treffen, als auch Wirbelströme, die in azimutaler Richtung, d.h. mit einer Querkomponente, auf die Anordnung der Einzelelemente auftreffen, minimiert. In contrast, the costs and the space required for the magnetic reflux are reduced with the solution according to the invention. In particular, it is possible to completely or at least partially avoid additional cooling. For this purpose, provided in the prior art electrical panels are completely or partially replaced by mutually electrically insulated rods. As a result, both eddy currents, which strike the arrangement of the individual elements from the radial direction, as well as eddy currents, which in the azimuthal direction, i. minimized with a transverse component impinging on the arrangement of the individual elements.
Bei der erfindungsgemäßen Lösung besteht die Anordnung der Einzelelemente aus einer Vielzahl von elektrisch gegeneinander isolierten Stäben, deren Längsachsen parallel zur Ofenachse verlaufen. Die Anordnung weist sowohl in radialer Richtung als auch in Umfangsrichtung der Spule mindestens zwei Stäbe auf, wodurch der vorstehend beschriebene Effekt der Reduzierung von Wirbelströmen in beiden Richtungen, d.h. radial und azimutal, reduziert wird. Die erfindungsgemäß eingesetzten Stäbe sind elektrisch ge¬ geneinander isoliert. Hierzu weisen die Stäbe, die aus magnetisch permeablem Material, insbesondere metallischem Ma- terial, wie Eisen, bestehen, einen Überzug aus elektrisch isolierendem Material auf, der beispielsweise über ein Tauchverfahren hergestellt wird. Hierfür können beispielsweise geeignete und bekannte Kunststoffe Anwendung finden. In the solution according to the invention, the arrangement of the individual elements of a plurality of electrically mutually insulated bars whose longitudinal axes are parallel to the furnace axis. The arrangement has at least two rods in both the radial direction and in the circumferential direction of the coil, as a result of which the above-described effect of reducing eddy currents in both directions, ie radially and azimuthally, is reduced. The rods used in the invention are electrically isolated against each other ¬ ge. For this purpose, the rods, which consist of magnetically permeable material, in particular metallic material such as iron, have a coating of electrically insulating material which is produced, for example, by a dipping method. For this purpose, for example, find suitable and known plastics application.
Vorzugsweise kommt eine Vielzahl von derartigen Stäben zum Einsatz, die entsprechend geringe Abmessungen besitzen, beispielsweise in einem Bereich von 0,35 x 0,35 bis 0,35 x 80 mm im Querschnitt (Abmessung in Umfangsrichtung x Abmessung in Radialrichtung) . Preferably, a plurality of such rods are used, which have correspondingly small dimensions, for example in a range of 0.35 x 0.35 to 0.35 x 80 mm in cross section (dimension in the circumferential direction x dimension in the radial direction).
Die mindestens zwei Stäbe können eine unterschiedliche Querschnittsform aufweisen. The at least two rods may have a different cross-sectional shape.
Bei einer Weiterbildung der erfindungsgemäßen Lösung be- steht die Anordnung aus Einzelelementen vollständig aus elektrisch gegeneinander isolierten Stäben. Bei einer anderen Ausführungsform besteht die Anordnung teilweise aus Blechen und teilweise aus Stäben. Hierbei besitzt die Anordnung vorzugsweise einen aus Blechen bestehenden zentra- len Bereich und zwei aus Stäben bestehende seitliche Außenbereiche. Bei dieser Ausführungsform werden gezielt die entstehenden Wirbelströme im zentralen Bereich, die eine zusätzliche Erwärmung der Bleche verursachen können, durch die in den Außenbereichen vorgesehenen Stäbe verhindert bzw. zumindest reduziert. Die um den Umfang der Ofenspule herum angeordneten magnetischen Rückschlüsse sind an der Außenmantelfläche der Ofenspule fixiert. Hierzu weist die Anordnung eines jeweiligen Rückschlusses eine Befestigungseinrichtung auf, die die An- Ordnung an der Außenmantelfläche der Spule fixiert. Andere Befestigungsarten, wie Kleben, Schweißen, sind ebenfalls möglich. Wenn eine mechanische Befestigungseinrichtung Anwendung findet, ist sie vorzugsweise als Tragkörper ausgebildet, der die Anordnung aus den Einzelelementen vorzugs- weise auf allen Seiten und oben und unten umgeben kann. In diesen Tragkörper kann die Anordnung aus den Einzelelementen eingepresst, eingeklebt oder auch eingegossen sein. In a further development of the solution according to the invention, the arrangement of individual elements consists entirely of bars insulated against each other. In another embodiment, the arrangement consists partly of sheets and partly of rods. In this case, the arrangement preferably has a central area consisting of sheets and two lateral outside areas consisting of bars. In this embodiment, the resulting eddy currents in the central region, which can cause additional heating of the sheets, are selectively prevented or at least reduced by the bars provided in the outer regions. The magnetic conclusions arranged around the circumference of the furnace coil are fixed to the outer circumferential surface of the furnace coil. For this purpose, the arrangement of a respective yoke has a fastening device which fixes the arrangement on the outer circumferential surface of the coil. Other types of fastening, such as gluing, welding, are also possible. If a mechanical fastening device is used, it is preferably designed as a supporting body, which can surround the arrangement of the individual elements preferably on all sides and above and below. In this support body, the arrangement of the individual elements can be pressed, glued or poured.
Bei einer speziellen Ausführungsform können die Stäbe und die ggf. vorhandenen Bleche mit einem Material, insbesondere Kunstharz, zu einem Gesamtpaket vergossen sein. Dieses Gesamtpaket kann beispielsweise in den Tragkörper eingegossen oder als Einsatz in den Tragkörper eingesetzt und in diesem fixiert sein. In a special embodiment, the bars and the sheets, if present, with a material, in particular synthetic resin, may be cast into a complete package. This overall package can be cast for example in the support body or used as an insert in the support body and fixed in this.
Wichtig ist, dass die Einzelelemente (Stäbe und ggf. Bleche) eng benachbart zueinander im Paket bzw. in der Anordnung vorgesehen sind. Was die Querschnittsform der Stäbe anbetrifft, so sind diese vorzugsweise im Querschnitt rechteckig, insbesondere quadratisch, ausgebildet. Dies schließt aber nicht aus, dass die Stäbe im Querschnitt rund ausgebildet sind, beispielsweise kreisförmig, elliptisch etc., oder als Polygon. Vorzugsweise kann mit der erfindungsgemäßen Ausführungsform eine zusätzliche Kühlung des Rückschlusses, insbesondere eine an den Seiten der Anordnung angeordnete Wasserkühlung, vermieden werden. Dies schließt allerdings nicht aus, dass, falls erforderlich, der Anordnung aus den Einzelelementen eine Kühleinrichtung, insbesondere an den Seitenflächen, zugeordnet ist. It is important that the individual elements (bars and possibly sheets) are provided closely adjacent to each other in the package or in the arrangement. As far as the cross-sectional shape of the rods is concerned, they are preferably rectangular in cross-section, in particular square. However, this does not exclude that the rods are round in cross-section, for example circular, elliptical, etc., or as a polygon. Preferably, with the embodiment according to the invention, an additional cooling of the return path, in particular a water cooling arranged on the sides of the arrangement, can be avoided. However, this does not exclude that, if necessary, the arrangement of the individual elements is associated with a cooling device, in particular on the side surfaces.
Bei einer weiteren Ausführungsform der Erfindung sind die elektrisch gegeneinander isolierten und sich parallel zur Ofenachse erstreckenden länglichen Einzelelemente der Anordnung so ausgebildet, dass nur im oberen und/oder unteren Bereich derselben Stäbe vorgesehen sind, während sich im übrigen Bereich Abschnitte mit größerem Querschnitt befin- den. In a further embodiment of the invention, the elongated individual elements of the arrangement, which are electrically insulated from one another and extend parallel to the furnace axis, are designed such that rods are provided only in the upper and / or lower region, while sections with a larger cross section are located in the remaining region ,
Diese Ausführungsform nutzt die Erkenntnis, dass die magnetische Flussdichte, die mit einer Querkomponente auf den magnetischen Rückschluss trifft, am oberen und/oder am un- teren Ende des Rückschlusses einen relativen Maximalwert aufweist. Daher sind die Wirbelströme an diesen Stellen am größten . This embodiment makes use of the knowledge that the magnetic flux density which strikes the magnetic return with a transverse component has a relative maximum value at the upper and / or lower end of the return path. Therefore, the eddy currents are greatest at these points.
Zur Minimierung dieser größten Wirbelströme ist es daher in erster Linie erforderlich, den magnetischen Rückschluss am oberen und/oder unteren Ende in Einzelstäbe aufzuteilen. In den restlichen Zonen des Rückschlusses kann sich bei dieser Ausführungs orm eine Aufteilung in Stäbe erübrigen. Positiver Nebeneffekt dieser Ausführungsform ist eine verbesserte mechanische Stabilität. Insbesondere weist bei dieser Ausführungsform die Anordnung längliche Einzelelemente auf, die im oberen und/oder unteren Bereich durch parallel zur Ofenachse verlaufende To minimize these largest eddy currents, it is therefore necessary in the first place to divide the magnetic return at the top and / or bottom in individual rods. In the remaining zones of the inference can in this embodiment orm a division into bars unnecessary. A positive side effect of this embodiment is an improved mechanical stability. In particular, in this embodiment, the arrangement has elongate individual elements which extend in the upper and / or lower region through parallel to the furnace axis
Schlitze gebildete Stäbe umfassen. Es kommen somit ge- schlitzte Einzelelemente zur Anwendung, die vorzugsweise am oberen und am unteren Ende geschlitzt sind. Slots formed bars include. Thus, slotted individual elements are used, which are preferably slotted at the top and at the bottom.
Die Schlitze können in Umfangsrichtung des Tiegelofens und/oder in Radialrichtung desselben verlaufen. Besonders bevorzugt wird eine Ausführungsform, bei der die Anordnung radial angeordnete Bleche aufweist, die im oberen und/oder unteren Bereich durch in Umfangsrichtung verlaufende The slots may extend in the circumferential direction of the crucible furnace and / or in the radial direction thereof. Particularly preferred is an embodiment in which the arrangement has radially arranged plates which extend in the upper and / or lower region through in the circumferential direction
Schlitze gebildete Stäbe umfassen. Diese Bleche können teilweise oder gänzlich oben und/oder unten mit mindestens einem Schlitz versehen sein, um in diesen Bereichen die erfindungsgemäß gewünschten Stäbe vorzusehen. Slots formed bars include. These sheets may be provided partially or entirely at the top and / or bottom with at least one slot in order to provide the inventively desired bars in these areas.
Die Stäbe müssen daher in Vertikalrichtung nicht durchlau- fend ausgebildet sein. Vielmehr können die Einzelelemente auch nur über einen Teil ihrer Längserstreckung als Stäbe ausgebildet sein, und zwar nur über den oberen und/oder un- teren Teil, während der restliche Teil der Einzelelemente einen größeren Querschnitt besit zt . Wie bereits erwähnt, sind die erfindungsgemäß vorgesehenen Stäbe gegeneinander elektrisch isoliert. Dabei kann die elektrische Isolation beispielsweise durch einen Luftspalt oder durch irgendein Isoliermaterial verwirklicht sein. Der Begriff „elektrisch isoliert" soll daher alle möglichen Ar- ten einer Isolierung abdecken. Die Erfindung betrifft ferner einen magnetischen Rück- schluss für einen Induktionstiegelofen der vorstehend beschriebenen Art. Die Erfindung wird nachfolgend anhand von Ausführungsbeispielen in Verbindung mit der Zeichnung im Einzelnen erläutert. Es zeigen: The rods therefore do not have to be formed continuously in the vertical direction. Rather, the individual elements may also be formed as rods only over a part of their longitudinal extension, specifically only over the upper and / or lower part, while the remaining part of the individual elements has a larger cross-section. As already mentioned, the rods provided according to the invention are electrically insulated from one another. In this case, the electrical insulation can be realized for example by an air gap or by any insulating material. The term "electrically isolated" is therefore intended to cover all possible types of insulation. The invention further relates to a magnetic return for an induction crucible furnace of the type described above. The invention will be explained in more detail below with reference to exemplary embodiments in conjunction with the drawing. Show it:
Figur 1 einen Horizontalschnitt durch einen Teil ei- nes Induktionstiegelofens, wobei ein magnetischer Rückschluss des Ofens dargestellt ist, bei einer Ausführungsform des Standes der Technik; Figur 2 eine entsprechende Darstellung wie Figur 1 mit einer ersten Ausführungsform der Erfindung; eine entsprechende Darstellung wie Figur 1 mit einer zweiten Ausführungsform der Erfindung ; einen Vertikalschnitt durch einen Teil einer anderen Ausführungsform eines Induktionstiegelofens mit magnetischem Rückschluss; FIG. 1 shows a horizontal section through a part of an induction crucible furnace, showing a magnetic inference of the furnace, in one embodiment of the prior art; Figure 2 is a similar view as Figure 1 with a first embodiment of the invention; a corresponding representation as Figure 1 with a second embodiment of the invention; a vertical section through a portion of another embodiment of a magnetic induction induction crucible furnace;
Figur 5 eine vergrößerte Ansicht des oberen Teiles des magnetischen Rückschlusses der Figur 4; und Figure 5 is an enlarged view of the upper part of the magnetic yoke of Figure 4; and
Figur 6 eine schematische Vorderansicht des magneti- sehen Rückschlusses der Figuren 4 und 5. FIG. 6 is a schematic front view of the magnetic see conclusions of the figures 4 and 5.
Figur 1 zeigt einen Horizontalschnitt durch einen Teil ei¬ ner Spule 1, die einen Tiegel (nicht gezeigt) eines Induk- tionstiegelofens umgibt. Um den Umfang der Spule 1 herum sind in Abständen einzelne magnetische Rückschlüsse 2 ange¬ ordnet. Diese magnetischen Rückschlüsse 2 sind in der Form einzelner an der Außenmantelfläche der Spule 1 mit Umfangs- abstand angeordneter Einheiten ausgebildet, die jeweils zur Führung des von der Spule 1 erzeugten magnetischen Flusses eine Anordnung aus einer Vielzahl von elektrisch gegeneinander isolierten und sich parallel zur Ofenachse erstreckenden länglichen Einzelelementen aus magnetisch permeablem Material umfassen. Bei der in Figur 1 dargestellten Ausführungsform des Standes der Technik handelt es sich hierbei um eine Anordnung 3 aus einer Vielzahl von elektrisch gegeneinander isolierten und parallel zueinander angeordneten dünnen Elektroblechen, die sich im Wesentlichen in Radialrichtung von der Ofenspule 1 aus erstrecken. Diese Anordnung 3 von Elektroblechen befindet sich innerhalb eines Tragkörpers 5, der sämtliche Seiten der Anordnung 3, auch die Oberseite und Unterseite, umgibt. Die Anordnung 3 aus Elektroblechen ist hierbei in den Tragkörper 5 hinein- gepresst . Figure 1 shows a horizontal section through a part ei ¬ ner coil 1, a crucible (not shown) surrounds a crucible furnace in- duction. Around the circumference of the coil 1 around individual magnetic conclusions 2 are arranged at intervals ¬ . These magnetic inferences 2 are in the form of individual units arranged on the outer circumferential surface of the coil 1 with circumferential spacing, each of which is arranged to guide the magnetic flux generated by the coil 1 from a plurality of electrically mutually insulated and parallel to the furnace axis comprise elongated individual elements of magnetically permeable material. In the embodiment of the prior art shown in Figure 1, this is an arrangement 3 of a plurality of electrically insulated from each other and mutually parallel thin electric sheets extending substantially in the radial direction of the furnace coil 1 from. This arrangement 3 of electrical sheets is located within a support body 5, which surrounds all sides of the assembly 3, including the top and bottom. In this case, the arrangement 3 of electrical sheets is pressed into the carrier body 5.
An der einen Seitenfläche des Tragkörpers befindet sich eine Wasserkühlung 4, die dazu dient, entsprechende Wirbelströme, die aus denjenigen Feldlinien resultieren, die aus einer azimutalen Richtung, d.h. mit einer Querkomponente , auf die Elektrobleche auftreffen und die eine zusätzliche Erwärmung der Bleche verursachen, zu kompensieren. Figur 2 zeigt eine entsprechende Ausführungsform, bei der der magnetische Rückschluss 2 erfindungsgemäß ausgebildet ist. Auch hierbei ist der Rückschluss 2 in Kontakt mit der Außenmantelfläche der Ofenspule 1 angeordnet und setzt sich grundsätzlich aus einer Anordnung 3 von Einzelelementen zusammen. Von diesen Einzelelementen ist nur der zentrale Teil aus dünnen Elektroblechen gebildet, während die beiden seitlichen äußeren Bereiche 6 aus elektrisch gegeneinander isolierten Stäben bestehen, deren Längsachsen parallel zur Ofenachse verlaufen. Hierdurch werden Wirbelströme reduziert, die auf Feldlinien basieren, welche aus einer azimutalen Richtung auf die Anordnung 3 auftreffen. Auch bei dieser Ausführungsform wird die Anordnung von einem Trag- körper 5 umgeben, dem seitlich eine Wasserkühlung 4 zugeordnet ist. Aufgrund der durch die elektrisch gegeneinander isolierten Stäbe gebildeten Außenbereiche der Anordnung kann auf diese Wasserkühlung auch verzichtet werden. Figur 3 zeigt eine entsprechende Ausführungsform eines magnetischen Rückschlusses, bei dem die gesamte Anordnung 3 aus elektrisch gegeneinander isolierten Stäben 7 gebildet ist, deren Längsachsen parallel zur Ofenachse verlaufen. Die Stäbe 7 sind bei dieser Ausführungsform mit einer On one side surface of the support body is a water cooling 4, which serves to corresponding eddy currents resulting from those field lines, which impinge on the electrical sheets from an azimuthal direction, ie with a transverse component, and which cause an additional heating of the sheets to compensate. Figure 2 shows a corresponding embodiment in which the magnetic yoke 2 is formed according to the invention. Again, the yoke 2 is arranged in contact with the outer surface of the furnace coil 1 and is basically composed of an array 3 of individual elements. Of these individual elements, only the central part is formed of thin electrical sheets, while the two lateral outer portions 6 consist of electrically mutually insulated bars whose longitudinal axes are parallel to the furnace axis. As a result, eddy currents are reduced, which are based on field lines, which impinge on the assembly 3 from an azimuthal direction. Also in this embodiment, the arrangement is surrounded by a support body 5, the side of a water cooling 4 is assigned. Due to the outer regions of the arrangement formed by the bars which are insulated against each other electrically, this water cooling can also be dispensed with. Figure 3 shows a corresponding embodiment of a magnetic yoke, in which the entire assembly 3 is formed from electrically mutually insulated rods 7, whose longitudinal axes are parallel to the furnace axis. The rods 7 are in this embodiment with a
Kunstharzmasse zu einem Einsatz vergossen, der im Tragkörper 5 fixiert ist.  Cast resin mass to an insert, which is fixed in the support body 5.
Die Figuren 4 bis 6 zeigen eine weitere Ausführungsform ei- nes Induktionstiegelofens mit magnetischem Rückschluss. Im Vertikalschnitt der Figur 4 ist ein Teil eines Tiegelofens 10 mit Induktionsspule 1 schematisch dargestellt. An der Induktionsspule 1 befindet sich ein magnetischer Rück- schluss 2, der bei dieser Ausführungsform eine Anordnung 3 von in Radialrichtung verlaufenden parallel zueinander an- geordneten Blechen umfasst. Diese Bleche sind an ihrem oberen und an ihrem unteren Ende durch in Umfangsrichtung des Tiegelofens 10 verlaufende Schlitze 11 in einzelne Stäbe 7 aufgeteilt, bei denen es sich wie bei den vorhergehenden Ausführungsformen um elektrisch gegeneinander isolierte Stäbe handelt. FIGS. 4 to 6 show a further embodiment of an induction crucible furnace with magnetic inference. In the vertical section of Figure 4 is a part of a crucible furnace 10 schematically illustrated with induction coil 1. On the induction coil 1 there is a magnetic yoke 2, which in this embodiment comprises an arrangement 3 of plates extending in the radial direction and arranged parallel to one another. These sheets are divided at its upper and at its lower end by extending in the circumferential direction of the crucible furnace 10 slots 11 into individual bars 7, which is electrically isolated from each other as in the previous embodiments bars.
Bei der hier dargestellten Ausführungsform ist ein Blech durch Schlitze 11 in vier nebeneinander angeordnete Stäbe 7 aufgeteilt, und zwar sowohl am oberen als auch am unteren Ende. Diese Stäbe 7 sind dort vorgesehen, wo die größten Wirbelströme auftreten. In the embodiment shown here, a sheet is divided by slots 11 into four juxtaposed rods 7, both at the top and at the bottom. These rods 7 are provided where the largest eddy currents occur.
Figur 6 zeigt eine schematische Vorderansicht des Rückschlusses 2 mit der Anordnung 3 von Einzelelementen, welche parallel zueinander und radial angeordnete Bleche umfassen, die jeweils am oberen und unteren Ende in Stäbe 7 aufgeteilt sind. FIG. 6 shows a schematic front view of the return yoke 2 with the arrangement 3 of individual elements which comprise mutually parallel and radially arranged plates which are divided into bars 7 at the upper and lower ends, respectively.

Claims

Patentansprüche claims
Induktionstiegelofen mit einem feuerfesten zylinderförmigen Tiegel, einer zylinderförmigen sich um den Tiegel erstreckenden Spule (1) und einer Vielzahl von magnetischen Rückschlüssen (2), die in Form einzelner an der Außenmantelfläche der Spule (1) mit Umfangsabstand angeordneter Einheiten ausgebildet sind, die jeweils zur Führung des von der Spule (1) erzeugten magnetischen Flusses eine Anordnung (3) aus einer Vielzahl von elektrisch gegeneinander isolierten und sich parallel zur Ofenachse erstreckenden länglichen Einzelelementen aus magnetisch permeablem Material umfassen, dadurch gekennzeichnet, dass die Einzelelemente zumindest teilweise aus elektrisch gegeneinander isolierten Stäben (7) bestehen, deren Längsachsen parallel zur Ofenachse verlaufen, wobei die Anordnung (3) sowohl in radialer Richtung als auch in Umfangs- richtung der Spule (1) mindestens zwei Stäbe (7) aufweist . Induktionstiegelofen nach Anspruch 1, dadurch gekennzeichnet, dass die mindestens zwei Stäbe eine unterschiedliche Querschnittsform aufweisen. An induction crucible furnace comprising a refractory cylindrical crucible, a cylindrical spool (1) extending around the crucible and a plurality of magnetic inlets (2) formed as individual units circumferentially spaced on the outer surface of the spool (1) Guiding the magnetic flux generated by the coil (1) an arrangement (3) of a plurality of electrically insulated from each other and parallel to the furnace axis extending elongated individual elements of magnetically permeable material, characterized in that the individual elements at least partially electrically insulated from each other bars (7) whose longitudinal axes are parallel to the furnace axis, the arrangement (3) having at least two rods (7) both in the radial direction and in the circumferential direction of the coil (1). Induction crucible furnace according to claim 1, characterized in that the at least two rods have a different cross-sectional shape.
Induktionstiegelofen nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Anordnung (3) vollständig aus elektrisch gegeneinander isolierten Stäben (7) besteht. Induction crucible furnace according to claim 1 or 2, characterized in that the arrangement (3) consists entirely of electrically mutually insulated bars (7).
Induktionstiegelofen nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Anordnung (3) teilweise aus Blechen und teilweise aus Stäben (7) besteht . Induction crucible furnace according to claim 1 or 2, characterized in that the arrangement (3) consists partly of sheets and partly of bars (7).
Induktionstiegelofen nach Anspruch 4, dadurch gekennzeichnet, dass die Anordnung (3) einen aus Blechen bestehenden zentralen Bereich und zwei aus Stäben (7) bestehende seitliche Außenbereiche (6) aufweist . Induction crucible furnace according to claim 4, characterized in that the arrangement (3) comprises a central area consisting of sheets and two lateral outer areas (6) consisting of bars (7).
Induktionstiegelofen nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Anordnung (3) eine Befestigungseinrichtung aufweist, die sie an der Außenmantelfläche der Spule (1) fixiert . Induction crucible furnace according to one of the preceding claims, characterized in that the arrangement (3) has a fastening device which fixes it to the outer circumferential surface of the coil (1).
Induktionstiegelofen nach Anspruch 6, dadurch gekennzeichnet, dass die Befestigungseinrichtung als Tragkörper (5) ausgebildet ist und dass die Anordnung (3) in den Tragkörper (5) eingepresst, eingeklebt oder eingegossen ist. Induktionstiegelofen nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Stäbe (7) und ggf. Bleche mit einem Material, insbesondere Kunstharz, zu einem Gesamtpaket vergossen sind . Induction crucible furnace according to claim 6, characterized in that the fastening device is designed as a supporting body (5) and that the arrangement (3) in the supporting body (5) is pressed, glued or cast. Induction crucible furnace according to one of the preceding claims, characterized in that the rods (7) and possibly sheets with a material, in particular synthetic resin, are cast into a total package.
Induktionstiegelofen nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Stäbe (7) im Querschnitt rechteckig, insbesondere quadratisch, ausgebildet sind. Induction crucible furnace according to one of the preceding claims, characterized in that the rods (7) are rectangular in cross-section, in particular square, are formed.
Induktionstiegelofen nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Stäbe im Querschnitt rund ausgebildet sind. Induction crucible furnace according to one of claims 1 to 8, characterized in that the rods are round in cross-section.
Induktionstiegelofen nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Anordnung (3) eine Kühleinrichtung (4), insbesondere an den Seitenflächen, zugeordnet ist. Induction crucible furnace according to one of the preceding claims, characterized in that the arrangement (3) is associated with a cooling device (4), in particular on the side surfaces.
Induktionstiegelofen nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die elektrisch gegeneinander isolierten und sich parallel zur Ofenachse erstreckenden länglichen Einzelelemente der Anordnung (3) so ausgebildet sind, dass nur im oberen und/oder unteren Bereich derselben Stäbe (7) vorgesehen sind, während sich im übrigen Bereich Abschnitte mit größerem Querschnitt befinden . Induktionstiegelofen nach Anspruch 12, dadurch ge kennzeichnet, dass die Anordnung (3) längliche Einzelelemente aufweist, die im oberen und/oder unteren Bereich durch parallel zur Ofenachse verlaufende Schlitze (11) gebildete Stäbe umfassen. Induction crucible furnace according to one of the preceding claims, characterized in that the elongated individual elements of the arrangement (3) which are electrically insulated from each other and extend parallel to the furnace axis are formed so that only in the upper and / or lower region of the same rods (7) are provided in the remaining area are sections with a larger cross-section. Induction crucible furnace according to claim 12, characterized in that the arrangement (3) comprises elongate individual elements which comprise rods formed in the upper and / or lower region by slots (11) extending parallel to the furnace axis.
Induktionstiegelofen nach Anspruch 13, dadurch ge kennzeichnet, dass die Schlitze (11) in Umfangs- richtung des Tiegelofens und/oder in Radialrichtung desselben verlaufen. Induction crucible furnace according to claim 13, characterized in that the slots (11) extend in the circumferential direction of the crucible furnace and / or in the radial direction thereof.
Induktionstiegelofen nach Anspruch 13 oder 14, da durch gekennzeichnet, dass die Anordnung (3) radi al angeordnete Bleche aufweist, die im oberen und/oder unteren Bereich durch in Umfangsrichtung verlaufende Schlitze (11) gebildete Stäbe (7) umfassen . Induction crucible furnace according to claim 13 or 14, characterized in that the arrangement (3) radi al arranged sheets comprising in the upper and / or lower region formed by circumferentially extending slots (11) rods (7).
Magnetischer Rückschluss für einen Induktionstiegelofen nach einem der vorangehenden Ansprüche. Magnetic conclusion for an induction crucible furnace according to one of the preceding claims.
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DE102015015337B4 (en) 2018-06-21
US10887953B2 (en) 2021-01-05
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EP3345453B1 (en) 2020-10-07
CN107926087B (en) 2020-12-08
HK1253937A1 (en) 2019-07-05
DE102015015337A1 (en) 2017-03-02
WO2017036438A1 (en) 2017-03-09

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