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EP0208066B1 - Vacuum induction furnace - Google Patents

Vacuum induction furnace Download PDF

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Publication number
EP0208066B1
EP0208066B1 EP86104874A EP86104874A EP0208066B1 EP 0208066 B1 EP0208066 B1 EP 0208066B1 EP 86104874 A EP86104874 A EP 86104874A EP 86104874 A EP86104874 A EP 86104874A EP 0208066 B1 EP0208066 B1 EP 0208066B1
Authority
EP
European Patent Office
Prior art keywords
outer vessel
vessel
rim
induction coil
vacuum induction
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
EP86104874A
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German (de)
French (fr)
Other versions
EP0208066A1 (en
Inventor
Peter Dipl.-Ing. Drysch
Adolf Bauer
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.)
Marx & Co KG GmbH
Original Assignee
Marx & Co KG 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 Marx & Co KG GmbH filed Critical Marx & Co KG GmbH
Priority to AT86104874T priority Critical patent/ATE36061T1/en
Publication of EP0208066A1 publication Critical patent/EP0208066A1/en
Application granted granted Critical
Publication of EP0208066B1 publication Critical patent/EP0208066B1/en
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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/22—Furnaces without an endless core
    • H05B6/24—Crucible furnaces
    • H05B6/26—Crucible furnaces using vacuum or particular gas atmosphere
    • 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
    • F27B14/04—Crucible or pot furnaces adapted for treating the charge in vacuum or special atmosphere
    • 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 specially adapted for crucible or pot furnaces
    • F27B14/10—Crucibles
    • 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
    • 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 specially adapted for crucible or pot furnaces
    • F27B14/10—Crucibles
    • F27B14/12—Covers therefor

Definitions

  • the invention relates to a vacuum induction furnace for the heating and treatment of metallic melts, consisting of a stationary part which, in addition to the supporting furnace frame, comprises the cooled induction coil arranged thereon and the magnetic yokes surrounding it, as well as a replaceable bearing in the furnace frame Transportable, dimensionally stable melting material container with a lid made of refractory material and a cover intended for the vacuum-tight closure of the container mouth, the latter including the cover with a spacing overlapping hood, which is tightly closed on a wreath equipped with sealing blades and encompassing the melting material container.
  • a vacuum induction furnace of this type, from which the invention is based, is known from DE-AS-22 43 769.
  • the melting vessel formed as a pan or crucible is covered with a gas-tight plastic jacket and inserted into the induction coil with a relatively large amount of play.
  • the collar supporting the hood is attached in a gas-tight manner at the upper end of the melting material vessel.
  • a cooling tube system which can be acted upon by gaseous coolant, in particular air, is embedded in the jacket of the melted material, which consists of a plurality of cooling tubes running along the melting material and distributed around the circumference and connected to one another, and which is primarily intended for the gas-tight Protect plastic sheath and the induction coil from overheating.
  • the object of the invention is to improve a vacuum induction furnace of the type specified in the preamble of claim 1 with simple means and measures such that a simpler and cheaper production can be achieved, which also results in an improvement in the efficiency of the vacuum induction furnace and its functional reliability.
  • the solution to this problem is characterized in that an outer vessel made of fireproof, non-magnetizable, heat-insulating material is arranged, which is only open at the top and comprises the melting material vessel with virtually no play, the outer vessel is surrounded by the cooled induction coil without play, the ring with an axial distance from it Induction coil is placed tightly on the outside of the mouth edge part of the outer vessel, and that the outer vessel has a gas-tight envelope.
  • the outer vessel which is fixed to the frame, achieves such thermal insulation that the cooling tube system to be embedded in the jacket of the melting material vessel is no longer necessary, which results in a considerable reduction in production costs and also in operating costs.
  • the gas-tight envelope of the outer vessel is arranged in such a way that there is no risk of damage to the gas-tight envelope when inserting or removing the melting material vessel.
  • the gas tightness of the outer vessel can be achieved by a glaze added on the outside and possibly also on the inside.
  • the outer vessel has a gas-tight envelope made of plastic.
  • the outer vessel is lined with a heat-resistant layer of mineral fibers, in particular of micanite.
  • this at least makes it impossible to adhere firmly to the melting vessel in the outer vessel.
  • the drawing shows a vacuum induction furnace in longitudinal section.
  • This vacuum induction furnace comprises a stationary part 1 and a transportable part 2.
  • the latter consists of a melting material vessel 3 having annular cross-sections with a snout 4 and a lid 5 closing its mouth.
  • the melting material vessel 3 including snout 4 and lid 5 are made of ceramic ramming mass.
  • the melting material vessel 3 is tapered in its lower region towards its base 6.
  • a inspection hole 8 is arranged in the cover 5.
  • the melting material vessel 3 is stamped into an outer vessel 10 held on the furnace frame 9 virtually without play and detachably, which extends upwards extends under the snout 4 of the outer vessel 10.
  • the pot-shaped outer vessel 10 also has circular cross sections, is also made of ceramic ramming paste and is supported with its base 11 on a frame plate 12.
  • the bottoms 6 and 11 are each thicker than the side walls of the melting material vessel 3 and the outer vessel 10.
  • the outer vessel 10 together with the bottom 11 has an inseparably attached, gas-tight sheath 13 made of plastic, which extends over its entire outer side and optionally the inner side, and is surrounded by an induction coil 14 with magnetic yokes 15 held on the frame, for example water-coolable, the induction coil 14 bears directly and without play on the outer vessel envelope 13.
  • a collar 16 encompassing the vascular orifices 16 is tightly closed on the outer vessel 10 above the induction coil 14 and at an axial distance from the latter.
  • the latter has a circumferential sealing cutting edge 17 on which a gas-tight hood 19 equipped with an annular seal 18 is supported.
  • a circumferential stuffing box seal 20 of a known type is held thereon, the sealing means of which are applied in a sealing manner to the casing 13 of the outer vessel 10.
  • the stuffing box seal 20 is arranged below the outer vessel mouth and at an axial distance therefrom.
  • annular cooling device 21 which bears against the inside of the ring 16 is arranged within the ring 16 at a radial distance from the outer vessel 10.
  • the annular space located above the gland seal 20 between the outer vessel and the cooling device 21 is filled with silicone potting compound 22.
  • annular cooling device 23 made of austenitic steel, which is arranged at an axial distance from the ring 16 and comprises the outer vessel 10, is then arranged on the latter.
  • a cooling device 24 of the same type comprises the area of the outer vessel 10 located below the induction coil.
  • a cooling device 25 which is effective on the bottom 11 of the outer vessel 10 is arranged below the frame plate 12.
  • gaseous coolant is supplied to the cooling devices.
  • the outer vessel 10 has a lining 26 made of micanite.

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

Abstract

1. A vacuum induction oven for the heating and treatment of molten metallic masses, consisting of a stationary part which, besides the oven support, includes the cooled induction coil and the surrounding external magnet yokes arranged in it, as well as, interchangeably housed in the oven support and capable of being transported to this, a shape-retaining melt vessel with a lid, made of fireproof material, and a hood specifically made for the vacuum-tight closing of the vessel mouth, overlapping, with a gap, the latter together with the lid, which hood is supported to form a tight closure on a rim, provided with a sealing edge, surrounding the melt vessel, characterized in that a rigidly held outer vessel (10) made of fireproof, non-magnetizable, heat insulating material, which is open only at the top, is arranged surrounding the melt vessel (3) almost without play, the outer vessel (10) is surrounded without play by the cooled induction coil (14), the rim (16) is attached, with an axial separation from the induction coil (14), outside on the opening rim part of the outer vessel (10) to form a seal, and the outer vessel (10) has a gastight coating (13).

Description

Die Erfindung betrifft einen Vakuuminduktionsofen für die Beheizung und Behandlung metallischer Schmelzen, bestehend aus einem stationären Teil, der außer dem tragenden Ofengestell, die an diesem angeordnete, gekühlte Induktionsspule und die diese außen umschließenden Magnetjoche umfaßt, sowie aus einem im Ofengestell auswechselbar gelagerten, für sich transportfähigen, formstabilen Schmelzgutgefäß mit Deckel aus feuerfestem Material und aus einer für den vakuumdichten Abschluß der Gefäßmündung bestimmten, letztere samt Deckel mit Abstand übergreifenden Haube, die sich an einem mit Dichtschneiden bestückten, das Schmelzgutgefäß umfassenden Kranz dichtschließend abstützt.The invention relates to a vacuum induction furnace for the heating and treatment of metallic melts, consisting of a stationary part which, in addition to the supporting furnace frame, comprises the cooled induction coil arranged thereon and the magnetic yokes surrounding it, as well as a replaceable bearing in the furnace frame Transportable, dimensionally stable melting material container with a lid made of refractory material and a cover intended for the vacuum-tight closure of the container mouth, the latter including the cover with a spacing overlapping hood, which is tightly closed on a wreath equipped with sealing blades and encompassing the melting material container.

Ein Vakuuminduktionsofen dieser Art, von dem die Erfindung ausgeht, ist aus der DE-AS-22 43 769 bekannt.A vacuum induction furnace of this type, from which the invention is based, is known from DE-AS-22 43 769.

Bei diesem bekannten Vakuuminduktionsofen ist das als Pfanne oder Tiegel ausgebildete Schmelzgutgefäß mit einem gasdichten Kunststoffmantel umfaßt und mit relativ großem Spiel in die Induktionsspule eingesetzt.In this known vacuum induction furnace, the melting vessel formed as a pan or crucible is covered with a gas-tight plastic jacket and inserted into the induction coil with a relatively large amount of play.

Ferner ist der die Haube tragende Kragen am oberen Ende des Schmelzgutgefäßes gasdicht befestigt.Furthermore, the collar supporting the hood is attached in a gas-tight manner at the upper end of the melting material vessel.

Außerdem ist in den Mantel des aus Stampfmasse hergestellten Schmelzgutgefäßes ein mit gasförmigem Kühlmittel, insbesondere Luft, beaufschlagbares Kühlrohrsyttem eingebettet, welches aus einer Vielzahl längs des Schmelzgutgefäßes verlaufender und auf den Umfang verteilt angeordneter sowie miteinander verbundener Kühlrohre besteht und welches vorallem dazu bestimmt ist, den gasdichten Kunststoffmantel und die Induktionsspule vor Überhitzung zu schützen.In addition, a cooling tube system which can be acted upon by gaseous coolant, in particular air, is embedded in the jacket of the melted material, which consists of a plurality of cooling tubes running along the melting material and distributed around the circumference and connected to one another, and which is primarily intended for the gas-tight Protect plastic sheath and the induction coil from overheating.

Die Herstellung eines derartigen Schmelzgutgefäßes ist aber relativ kompliziert und aufwendig. Zudem sind die Betriebskosten zur Kühlung des Schmelzgutgefäßes beträchtlich.However, the production of such a melting material vessel is relatively complicated and complex. In addition, the operating costs for cooling the melting vessel are considerable.

Aufgabe der Erfindung ist es nun, einen Vakuuminduktionsofen der im Oberbegriff des Anspruches 1 angegebenen Art mit einfachen Mitteln und Maßnahmen derart zu verbessern, daß eine einfachere und billigere Herstellung erreichbar ist, die auch eine Verbesserung des Wirkungsgrades des Vakuuminduktionsofens und seiner Funktionssicherheit ergibt.The object of the invention is to improve a vacuum induction furnace of the type specified in the preamble of claim 1 with simple means and measures such that a simpler and cheaper production can be achieved, which also results in an improvement in the efficiency of the vacuum induction furnace and its functional reliability.

Die Lösung dieser Aufgabe ist dadurch gekennzeichnet, daß ein gestellfest gehaltertes, lediglich oben offenes, das Schmelzgutgefäß quasi spiellos umfassendes Außengefäß aus feuerfestem, unmagnetisierbarem, wärmeisolierendem Material angeordnet ist, das Außengefäß von der gekühlten Induktionsspule spiellos umfaßt ist, der Kranz mit axialem Abstand von der Induktionsspule außen an den Mündungsrandteil des Außengefäßes dichtschließend angelegt ist, und daß das Außengefäß eine gasdichte Umhüllung aufweist.The solution to this problem is characterized in that an outer vessel made of fireproof, non-magnetizable, heat-insulating material is arranged, which is only open at the top and comprises the melting material vessel with virtually no play, the outer vessel is surrounded by the cooled induction coil without play, the ring with an axial distance from it Induction coil is placed tightly on the outside of the mouth edge part of the outer vessel, and that the outer vessel has a gas-tight envelope.

Durch das gestellfeste Außengefäß wird eine solche Wärmeisolierung erzielt, daß sich das bislang in den Mantel des Schmelzgutgefäßes einzubettende Kühlrohrsystem erübrigt, woraus eine erhebliche Minderung der Herstellungskosten und auch der Betriebskosten resultiert.The outer vessel, which is fixed to the frame, achieves such thermal insulation that the cooling tube system to be embedded in the jacket of the melting material vessel is no longer necessary, which results in a considerable reduction in production costs and also in operating costs.

Zudem ist es nunmehr möglich, die Induktionsspule unmittelbar an die gasdichte Umhüllung des Außengefäßes anzufügen, woraus sich eine Erhöhung des Wirkungsgrades der Induktionsspule ergibt. Dabei ist aber auch sichergestellt, daß das Schmelzgutgefäß aus dem Ofen herausgehoben und gegebenenfalls auch durch ein anderes Schmelzgutgefäß ausgetauscht werden kann, ohne daß dazu zuvor irgendwelche Demontagen des Ofens erforderlich sind.In addition, it is now possible to add the induction coil directly to the gas-tight envelope of the outer vessel, which results in an increase in the efficiency of the induction coil. However, this also ensures that the melting material vessel can be lifted out of the furnace and, if necessary, also replaced by another melting material vessel, without the furnace having to be dismantled beforehand.

Bei alledem ist auch eine zusätzliche Kühlung der gasdichten Umhüllung des Außengefäßes, und zwar durch die ohnehin gekühlte Induktionsspule gegeben.In all of this, there is also additional cooling of the gas-tight envelope of the outer vessel, namely through the already cooled induction coil.

Weiterhin ist die gasdichte Umhüllung des Außengefäßes so angeordnet, daß beim Einsetzen bzw. beim Herausheben des Schmelzgutgefäßes die Gefahr einer Beschädigung der gasdichten Umhüllung nicht gegeben ist.Furthermore, the gas-tight envelope of the outer vessel is arranged in such a way that there is no risk of damage to the gas-tight envelope when inserting or removing the melting material vessel.

Die Gasdichtheit des Außengefäßes kann durch eine außen und gegebenenfalls auch innen angefügte Glasur erzielt werden.The gas tightness of the outer vessel can be achieved by a glaze added on the outside and possibly also on the inside.

Eine wesentlich robustere und relativ einfach reparierbare Gestaltung des vorbeschriebenen Vakuuminduktionsofens besteht darin, daß das Außengefäß eine gasdichte Umhüllung aus Kunststoff aufweist.A much more robust and relatively easy to repair design of the vacuum induction furnace described above is that the outer vessel has a gas-tight envelope made of plastic.

Zur weiteren Verbesserung des Wärmegefälles von innen nach außen ist es vorteilhaft, wenn das Außengefäß mit einer hochwarmfesten Schicht aus Mineralfasern, insbesondere aus Mikanit ausgekleidet ist.To further improve the heat gradient from the inside out, it is advantageous if the outer vessel is lined with a heat-resistant layer of mineral fibers, in particular of micanite.

Zudem wird dadurch eine unlösbare Haftung des Schmelzgutgefäßes im Außengefäß zumindest erschwert.In addition, this at least makes it impossible to adhere firmly to the melting vessel in the outer vessel.

Weitere, die Funktionssicherheit und Lebensdauer des vorbeschriebenen Vakuuminduktionsofens verbessernde Merkmale sind in den Ansprüchen 6 bis 8 offenbart.Further features that improve the functional reliability and service life of the vacuum induction furnace described above are disclosed in claims 6 to 8.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and will be described in more detail below.

Die Zeichnung zeigt einen Vakuuminduktionsofen im Längsschnitt.The drawing shows a vacuum induction furnace in longitudinal section.

Dieser Vakuuminduktionsofen umfaßt einen stationären Teil 1 und einen transportfähigen Teil 2. Letzterer besteht aus einem kreisringförmige Querschnitte aufweisenden Schmelzgutgefäß 3 mit einer Schnauze 4 und einem dessen Mündung verschließenden Deckel 5. Das Schmelzgutgefäß 3 samt Schnauze 4 und Deckel 5 sind aus keramischer Stampfmasse hergestellt.This vacuum induction furnace comprises a stationary part 1 and a transportable part 2. The latter consists of a melting material vessel 3 having annular cross-sections with a snout 4 and a lid 5 closing its mouth. The melting material vessel 3 including snout 4 and lid 5 are made of ceramic ramming mass.

Das Schmelzgutgefäß 3 ist in seinem unteren Bereich zu seinem Boden 6 hin konisch verjüngt ausgebildet.The melting material vessel 3 is tapered in its lower region towards its base 6.

Im Deckel 5 ist ein Schauloch 8 angeordnet.A inspection hole 8 is arranged in the cover 5.

Das Schmelzgutgefäß 3 ist in ein am Ofengestell 9 gehaltertes Außengefäß 10 quasi spiellos und lösbar eingestampft, welches nach oben sich bis unter die Schnauze 4 des Außengefäßes 10 erstreckt. Das topfförmige Außengefäß 10 hat ebenfalls kreisringförmige Querschnitte, ist ebenfalls aus keramischer Stampfmasse hergestellt und stützt sich mit seinem Boden 11 auf einer Gestellplatte 12 ab.The melting material vessel 3 is stamped into an outer vessel 10 held on the furnace frame 9 virtually without play and detachably, which extends upwards extends under the snout 4 of the outer vessel 10. The pot-shaped outer vessel 10 also has circular cross sections, is also made of ceramic ramming paste and is supported with its base 11 on a frame plate 12.

Die Böden 6 und 11 sind jeweils dicker als die Seitenwandungen des Schmelzgutgefäßes 3 bzw. des Außengefäßes 10 ausgebildet.The bottoms 6 and 11 are each thicker than the side walls of the melting material vessel 3 and the outer vessel 10.

Das Außengefäß 10 samt Boden 11 hat eine unlösbar angefügte und über dessen gesamte Außenseite und gegebenenfalls Innenseite sich erstreckende, gasdichte Umhüllung 13 aus Kunststoff und ist von einer am Gestell gehalterten, zum Beispiel mit Wasser kühlbaren Induktionsspule 14 mit Magnetjochen 15 umfaßt, wobei die Induktionsspule 14 an der Außengefäßumhüllung 13 unmittelbar und spiellos anliegt.The outer vessel 10 together with the bottom 11 has an inseparably attached, gas-tight sheath 13 made of plastic, which extends over its entire outer side and optionally the inner side, and is surrounded by an induction coil 14 with magnetic yokes 15 held on the frame, for example water-coolable, the induction coil 14 bears directly and without play on the outer vessel envelope 13.

Zum vakuumdichten Abschluß der Gefäßmündungen ist am Außengefäß 10 oberhalb der Induktionsspule 14 und mit axialem Abstand von letzterer ein die Gefäßmündungen umfassender Kranz 16 dichtschließend befestigt.For the vacuum-tight closure of the vascular orifices, a collar 16 encompassing the vascular orifices 16 is tightly closed on the outer vessel 10 above the induction coil 14 and at an axial distance from the latter.

Letzterer hat eine umlaufende Dichtschneide 17, auf der sich eine gasdichte und mit einer Ringdichtung 18 bestückte Haube 19 abstützt.The latter has a circumferential sealing cutting edge 17 on which a gas-tight hood 19 equipped with an annular seal 18 is supported.

Zur Abdichtung des Kranzes 16 ist an diesem eine umlaufende Stopfbuchsendichtung 20 ansich bekannter Art gehaltert, deren Dichtmittel an die Umhüllung 13 des Außengefäßes 10 dichtschließend angelegt sind.To seal the ring 16, a circumferential stuffing box seal 20 of a known type is held thereon, the sealing means of which are applied in a sealing manner to the casing 13 of the outer vessel 10.

Die Stopfbuchsendichtung 20 ist unterhalb der Außengefäßmündung und mit axialem Abstand von dieser angeordnet.The stuffing box seal 20 is arranged below the outer vessel mouth and at an axial distance therefrom.

Oberhalb der Stopfbuchsendichtung 20 ist innerhalb des Kranzes 16 eine ringförmige und an dessen Innenseite anliegende Kühleinrichtung 21 mit radialem Abstand vom Außengefäß 10 angeordnet.Above the stuffing box seal 20, an annular cooling device 21 which bears against the inside of the ring 16 is arranged within the ring 16 at a radial distance from the outer vessel 10.

Der oberhalb der Stopfbuchsendichtung 20 befindliche Ringraum zwischen dem Außengefäß und der Kühleinrichtung 21 ist mit Silikonvergußmasse 22 gefüllt.The annular space located above the gland seal 20 between the outer vessel and the cooling device 21 is filled with silicone potting compound 22.

Zwischen dem Kranz 16 und der Induktionsspule 14 ist anschließend an letztere eine mit axialem Abstand vom Kranz 16 angeordnete, ringförmige, das Außengefäß 10 umfassende Kühleinrichtung 23 aus austenitischem Stahl angeordnet. Eine zu letzterer gleichartige Kühleinrichtung 24 umfaßt den unterhalb der Induktionsspule befindlichen Bereich des Außengefäßes 10.Between the ring 16 and the induction coil 14, an annular cooling device 23 made of austenitic steel, which is arranged at an axial distance from the ring 16 and comprises the outer vessel 10, is then arranged on the latter. A cooling device 24 of the same type comprises the area of the outer vessel 10 located below the induction coil.

Zudem ist unterhalb der Gestellplatte 12 eine auf den Boden 11 des Außengefäßes 10 wirksame Kühleinrichtung 25 angeordnet. Den Kühleinrichtungen wird insbesondere gasförmiges Kühlmittel zugeführt.In addition, a cooling device 25 which is effective on the bottom 11 of the outer vessel 10 is arranged below the frame plate 12. In particular, gaseous coolant is supplied to the cooling devices.

Zur weiteren Erhöhung des Wärmegefälles von innen nach außen hat das Außengefäß 10 eine Auskleidung 26 aus Mikanit.To further increase the heat gradient from the inside to the outside, the outer vessel 10 has a lining 26 made of micanite.

Claims (8)

1. A vacuum induction oven for the heating and treatment of molten metallic masses, consisting of a stationary part which, besides the oven support, includes the cooled induction coil and the surrounding external magnet yokes arranged in it, as well as, interchangeably housed in the oven support and capable of being transported to this, a shape-retaining melt vessel with a lid, made of fireproof material, and a hood specifically made for the vacuum-tight closing of the vessel mouth, overlapping, with a gap, the latter together with the lid, which hood is supported to form a tight closure on a rim, provided with a sealing edge, surrounding the melt vessel, characterized in that a rigidly held outer vessel (10) made of fireproof, non-magnetizable, heat insulating material, which is open only at the top, is arranged surrounding the melt vessel (3) almost without play, the outer vessel (10) is surrounded without play by the cooled induction coil (14), the rim (16) is attached, with an axial separation from the induction coil (14), outside on the opening rim part of the outer vessel (10) to form a seal, and the outer vessel (10) has a gastight coating (13).
2. A vacuum induction oven according to Claim 1, characterized in that the outer vessel (10) is glazed outside and if necessary inside.
3. A vacuum induction oven according to Claim 1, characterized in that the outer vessel (10) has a gastight coating 13 made of synthetic material.
4. A vacuum induction oven according to any one of the preceding Claims, characterized in that the outer vessel (10) is covered with a highly heat resistant layer (26) of mineral fibres.
5. A vacuum induction oven according to any one of the preceding Claims, characterized in that the outer vessel (10) is glazed on the inside.
6. A vacuum induction oven according to any one of the preceding Claims, wherein the rim is sealed by means of a packing gland seal, characterized in that the packing gland seal (20) attached to the rim (16) is arranged with an axial separation from the mouth of the outer vessel (10), moreover in the rim (16), above the packing gland seal (20), a circular cooling system (21) is arranged encircling the opening edge section of the outer vessel (10), and further in that, in particular, the annular space above the packing gland seal (20) occurring between the cooling system (21) and the opening edge section of the outer vessel (10) is filled with a sealant especially a moulded silicone seal (22).
7. A vacuum induction oven according to any one of the preceding Claims, characterized in that a cooling system (23) made of non-magnetizable material, especially austentitic steel, is arranged on the outer vessel (10), encircling it, between the induction coil (14) and the rim (16), with an axial separation from the rim (16), and attached to the induction coil (14), and in that such a cooling system (24) is also attached to the bottom end section of the induction coil (14).
8. A vacuum induction oven according to any one of the preceding Claims, characterized in that beneath the base (11) of the outer vessel (10) a cooling system (25) is arranged acting on the latter.
EP86104874A 1985-07-11 1986-04-09 Vacuum induction furnace Expired EP0208066B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86104874T ATE36061T1 (en) 1985-07-11 1986-04-09 VACUUM INDUCTION FURNACE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3524714A DE3524714C1 (en) 1985-07-11 1985-07-11 Vacuum induction furnace
DE3524714 1985-07-11

Publications (2)

Publication Number Publication Date
EP0208066A1 EP0208066A1 (en) 1987-01-14
EP0208066B1 true EP0208066B1 (en) 1988-07-27

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EP86104874A Expired EP0208066B1 (en) 1985-07-11 1986-04-09 Vacuum induction furnace

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EP (1) EP0208066B1 (en)
AT (1) ATE36061T1 (en)
DE (2) DE3524714C1 (en)

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DE4042469C2 (en) * 1989-11-09 1994-09-15 Fuji Electric Co Ltd Device for heating molten metal in a ladle
RU2222756C1 (en) * 2002-12-16 2004-01-27 Закрытое акционерное общество "Промышленный центр "МАТЭКС" Coreless induction melting furnace for manufacturing ingots and castings from magnesium alloys
CN102564124A (en) * 2011-07-28 2012-07-11 郑坚明 Industrial electromagnetic smelting furnace
CN102628649A (en) * 2012-05-04 2012-08-08 苏州罗卡节能科技有限公司 Medium frequency induction furnace
CN105065857A (en) * 2015-08-24 2015-11-18 许浒 Heat preservation and insulation outer sleeve for kiln
CN108436044B (en) * 2018-05-31 2020-05-05 佛山峰合精密喷射成形科技有限公司 Smelting and casting equipment
RU2693717C1 (en) * 2018-10-24 2019-07-04 Акционерное общество "Научно-производственное объединение "Центральный научно-исследовательский институт технологии машиностроения" АО "НПО "ЦНИИТМАШ" Method of making a crucible lining of a vacuum induction furnace

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CH215010A (en) * 1939-05-05 1941-05-31 Philips Nv High-frequency induction furnace with negative pressure inside the furnace during operation.
US2665320A (en) * 1949-09-22 1954-01-05 Nat Res Corp Metal vaporizing crucible
US3412195A (en) * 1965-08-05 1968-11-19 Haveg Industries Inc Intermediate furnace barrier

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DE3660439D1 (en) 1988-09-01
ATE36061T1 (en) 1988-08-15
DE3524714C1 (en) 1986-07-10
EP0208066A1 (en) 1987-01-14

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