EP0493276A1 - Resistor for induction furnace - Google Patents

Resistor for induction furnace Download PDF

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Publication number
EP0493276A1
EP0493276A1 EP91420455A EP91420455A EP0493276A1 EP 0493276 A1 EP0493276 A1 EP 0493276A1 EP 91420455 A EP91420455 A EP 91420455A EP 91420455 A EP91420455 A EP 91420455A EP 0493276 A1 EP0493276 A1 EP 0493276A1
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EP
European Patent Office
Prior art keywords
resistor
plates
graphite
prism
notches
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91420455A
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German (de)
French (fr)
Inventor
Michel Maubert
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.)
Mersen SA
Original Assignee
Carbone Lorraine SA
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 Carbone Lorraine SA filed Critical Carbone Lorraine SA
Publication of EP0493276A1 publication Critical patent/EP0493276A1/en
Withdrawn legal-status Critical Current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
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor

Definitions

  • the present invention relates to a graphite resistor comprising several elements and intended to equip an induction heated oven.
  • the resistor reacts like the single turn of the secondary of a transformer in which the primary is constituted by the copper solenoid which surrounds the resistor.
  • the said solenoid when supplied with alternating current, the latter gives rise in the resistor to an electric current whose intensity is proportional to that which passes through the primary, which causes by Joule effect a heat emission which is then transmitted to the parts placed inside the resistor.
  • the object of the invention is to avoid the drawbacks mentioned above and in particular to be able to manufacture multi-element graphite resistors whose performance is improved compared to that of the prior art and / or of larger dimensions.
  • the object of the invention is a graphite resistor for an induction furnace, the lateral faces of which are arranged so as to form a straight prism and are constituted by identical plates which are joined together by their ends along a face parallel to the axis of the prism characterized in that for a prism with 2n sides, one has plates, that each of the plates is provided laterally with two identical longitudinal notches opening out respectively on either side of said plate and that the association of said plates results from the partial fitting of one of the notches in the notch of the neighboring element so as to leave between them and over their entire length a polygonal section space occupied by a graphite key of substantially adjacent section and shared over its entire length in two parts connecting along an oblique face.
  • the parts are assembled as described by fitting the notches into each other then, one threads one of the parts of the key in the space which remains free and one blocks the assembly by threading head- spade the other part and forcing it using a sledgehammer.
  • a flexible graphite strip is glued such as that which bears the mark "PAPYEX" so as to perfect the electrical junction between elements.
  • the dimensions of the resistor according to the invention are technologically limited by the dimensions of the standard solid graphite blocks in which the elements are machined. If the diameter can be increased by multiplying the number of elements, on the other hand the height is strictly limited to that of the solid graphite parts.
  • a modular structure can be used, that is to say that several identical prisms or modules are manufactured and the stack on top of each other by placing a strip of PAPYEX between them to obtain a single resistor of the desired height.
  • Each element can be machined in a particular way to provide it with means intended to facilitate its handling and its assembly.
  • FIG 1 there is a plate 1 whose outline corresponds to one side of the resistor bounded by the edges 2 and 3 and is extended by two half faces so as to be able to produce a prism of 2n sides with n plates.
  • This plate is provided with two notches 4 and 5 opening respectively on either side of said plate and is associated with its neighbors by the end faces 6 and 7 of said notches.
  • a hole 8a for handling and a hole 8b for positioning were made.
  • the elements 10 and 11 are marked with their respective end faces 14 and 15 equipped with their seal 16 and 17.
  • the two parts 18 and 19 of the key whose contact faces 20 and 21 extend obliquely over the entire height of the prism.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Details Of Resistors (AREA)
  • Furnace Details (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

The invention relates to a graphite resistor for induction furnace. <??>This resistor has the shape of a right prism with 2n faces, formed by the combination of n identical plates (10) in which each of these plates is provided laterally with two longitudinal notches emerging on one side and the other respectively of the said plate and in which the combination results from the partial nesting of one of the notches into the notch of the neighbouring element so as to leave between them and throughout their length a gap of polygonal cross-section occupied by a graphite pin of substantially similar cross-section and which is divided throughout its length into two parts (18) and (19) joining up along a sloping face. <??>This invention makes it possible to produce large-size resistors having high rigidity and exhibiting no electrical discontinuity. <IMAGE>

Description

DOMAINE DE L'INVENTION.FIELD OF THE INVENTION.

La présente invention concerne un résistor en graphite comportant plusieurs éléments et destiné à équiper un four chauffé par induction.The present invention relates to a graphite resistor comprising several elements and intended to equip an induction heated oven.

ETAT DE LA TECHNIQUE.STATE OF THE ART.

L'homme de l'art du chauffage par induction sait qu'il peut opérer de deux manières :

  • soit par induction directe dans les pièces à chauffer pour autant que celles-ci soient conductrices de l'electricité,
  • soit par chauffage indirect des pièces par l'intermédiaire d'un résistor de forme généralement cylindrique, cette seconde manière permettant le chauffage de pièces constituées de n'importe quel matériau.
Those skilled in the art of induction heating know that they can operate in two ways:
  • either by direct induction in the rooms to be heated as long as they are electrically conductive,
  • either by indirect heating of the parts through a generally cylindrical resistor, this second way allowing the heating of parts made of any material.

Dans ce dernier cas, on admet que le résistor réagit comme la spire unique du secondaire d'un transformateur dans lequel le primaire est constitué par le solénoïde en cuivre qui entoure le résistor. Dans ces conditions, quand on alimente le dit solénoïde en courant alternatif, ce dernier donne naissance dans le résistor à un courant électrique dont l'intensité est proportionnelle à celle qui passe dans le primaire ce qui provoque par effet Joule une émission de chaleur qui est alors transmise aux pièces placées à l'intérieur du résistor.In the latter case, it is assumed that the resistor reacts like the single turn of the secondary of a transformer in which the primary is constituted by the copper solenoid which surrounds the resistor. Under these conditions, when the said solenoid is supplied with alternating current, the latter gives rise in the resistor to an electric current whose intensity is proportional to that which passes through the primary, which causes by Joule effect a heat emission which is then transmitted to the parts placed inside the resistor.

Lorsqu'on veut chauffer des pièces volumineuses, il est difficile de réaliser des résistors d'un seul tenant, notamment quand on utilise le graphite pour les confectionner. En effet, les techniques actuelles de fabrication de ce matériau ne permettent pas de réaliser des blocs cylindriques de grandes dimensions que ce soit dans le sens de la hauteur ou du diamètre.When you want to heat large pieces, it is difficult to make resistors in one piece, especially when we use graphite to make them. Indeed, the current techniques for manufacturing this material do not allow large cylindrical blocks to be made either in the direction of the height or the diameter.

Une solution partielle à ce problème a été évoquée dans le document FR-A-2 364 590 qui décrit des résistors constitués par un assemblage de plusieurs morceaux, le dit assemblage pouvant être à queue d'aronde, à trait de Jupiter, à trait de Jupiter à double queue d'aronde, à entaille oblique et à entaille à mi-épaisseur avec cheville.A partial solution to this problem has been mentioned in the document FR-A-2 364 590 which describes resistors constituted by an assembly of several pieces, said assembly being able to be dovetail, with Jupiter line, with line Jupiter with double dovetail, oblique notch and half-thickness notch with ankle.

Mais, les modes d'assemblage prévus n'assurant pas toujours une qualité suffisante de jonction, des discontinuités électriques peuvent se produire, ce qui diminue les performances des résistors ainsi réalisés.However, since the assembly methods provided do not always provide a sufficient quality of junction, electrical discontinuities can occur, which reduces the performance of the resistors thus produced.

BUT DE L'INVENTION.PURPOSE OF THE INVENTION.

L'invention a pour but d'éviter les inconvénients cités plus haut et notamment de pouvoir fabriquer des résistors multiéléments en graphite dont les performances sont améliorées par rapport à celles de l'art antérieur et/ou de dimensions plus grandes.The object of the invention is to avoid the drawbacks mentioned above and in particular to be able to manufacture multi-element graphite resistors whose performance is improved compared to that of the prior art and / or of larger dimensions.

OBJET DE L'INVENTION.OBJECT OF THE INVENTION.

L'objet de l'invention est un résistor en graphite pour four à induction dont les faces latérales sont disposées de manière à former un prisme droit et sont constituées par des plaques identiques qui sont associées entre elles par leurs extrémités suivant une face parallèle à l'axe du prisme caractérisé en ce que pour un prisme à 2n côtés, on a n plaques, que chacune des plaques est munie latéralement de deux encoches longitudinales identiques débouchant respectivement de part et d'autre de la dite plaque et que l'association des dites plaques résulte de l'emboîtage partiel d'une des encoches dans l'encoche de l'élément voisin de manière à laisser entre elles et sur toute leur longueur un espace de section polygonale occupé par une clavette en graphite de section sensiblement voisine et partagée sur toute sa longueur en deux parties se raccordant suivant une face oblique.The object of the invention is a graphite resistor for an induction furnace, the lateral faces of which are arranged so as to form a straight prism and are constituted by identical plates which are joined together by their ends along a face parallel to the axis of the prism characterized in that for a prism with 2n sides, one has plates, that each of the plates is provided laterally with two identical longitudinal notches opening out respectively on either side of said plate and that the association of said plates results from the partial fitting of one of the notches in the notch of the neighboring element so as to leave between them and over their entire length a polygonal section space occupied by a graphite key of substantially adjacent section and shared over its entire length in two parts connecting along an oblique face.

Lors de la réalisation du résistor, on assemble les pièces telles que décrites en emboîtant les encoches les unes dans les autres puis, on enfile une des parties de la clavette dans l'espace qui reste libre et on bloque l'ensemble en enfilant tête-bêche l'autre partie et en la forçant à l'aide d'une masse.During the realization of the resistor, the parts are assembled as described by fitting the notches into each other then, one threads one of the parts of the key in the space which remains free and one blocks the assembly by threading head- spade the other part and forcing it using a sledgehammer.

On a ainsi un ensemble obtenu par clavetage auto-serrant qui forme un bloc extrêmement rigide et dont le comportement est tout à fait semblable à celui d'un résistor monobloc notamment en ce qui concerne ses propriétés électriques pour lesquelles on ne constate aucune anomalie au niveau des jonctions.There is thus an assembly obtained by self-tightening keying which forms an extremely rigid block and whose behavior is completely similar to that of a one-piece resistor in particular with regard to its electrical properties for which there is no anomaly at the level junctions.

De préférence, sur la face d'extrémité d'un élément en contact avec l'élément voisin, on colle une bande en graphite souple tel que celui qui porte la marque " PAPYEX " de manière à parfaire la jonction électrique entre éléments.Preferably, on the end face of an element in contact with the neighboring element, a flexible graphite strip is glued such as that which bears the mark "PAPYEX" so as to perfect the electrical junction between elements.

Les dimensions du résistor selon l'invention sont limitées technologiquement par les dimensions des blocs standards en graphite plein dans lesquels sont usinés les éléments. Si le diamètre peut être augmenté en multipliant le nombre d'éléments, par contre la hauteur est strictement limitée à celle des pièces en graphite plein. Selon l'invention, on peut utiliser une structure modulaire, c'est-à-dire qu'on fabrique plusieurs prismes identiques ou modules et les empile les uns sur les autres en plaçant entre eux une bande de PAPYEX afin d'obtenir un résistor unique de la hauteur souhaitée.The dimensions of the resistor according to the invention are technologically limited by the dimensions of the standard solid graphite blocks in which the elements are machined. If the diameter can be increased by multiplying the number of elements, on the other hand the height is strictly limited to that of the solid graphite parts. According to the invention, a modular structure can be used, that is to say that several identical prisms or modules are manufactured and the stack on top of each other by placing a strip of PAPYEX between them to obtain a single resistor of the desired height.

Chaque élément peut être usiné de façon particulière pour le munir de moyens destinés à faciliter sa manutention et son montage.Each element can be machined in a particular way to provide it with means intended to facilitate its handling and its assembly.

Ces moyens peuvent être, par exemple :

  • des trous borgnes d'axe perpendiculaire aux faces de l'élément qui permettent la fixation d'élingues pour la manutention des modules ;
  • des trous de positionnement utilisés lors du montage de plusieurs modules. Ces trous ont un axe parallèle à l'axe du module et sont placés l'un en face de l'autre sur les bases de chacun des modules : sur l'une des bases, le trou est borgne et sur l'autre, il débouche dans le trou destiné à la manutention.
These means can be, for example:
  • blind holes with an axis perpendicular to the faces of the element which allow the attachment of slings for handling the modules;
  • positioning holes used when mounting several modules. These holes have an axis parallel to the axis of the module and are placed one opposite the other on the bases of each module: on one of the bases, the hole is blind and on the other, it opens into the hole for handling.

Lors du montage, après avoir mis en place le premier module, on place dans ses trous de manutention des bouchons en graphite et dans ses trous de positionnement des pions dont les parties supérieures viendront se loger dans les trous de positionnement du deuxième module.During assembly, after having installed the first module, place in its handling holes graphite plugs and in its positioning holes pins whose upper parts will be received in the positioning holes of the second module.

L'invention présente de nombreux avantages et notamment :

  • la présence exclusive de graphite, ce qui entraîne une grande homogénéité des coefficients de dilatation dans tout le résistor et donc une quasi-absence d'anomalies au niveau des jonctions :
  • l'utilisation d'éléments identiques, ce qui facilite leur usinage ;
  • la mise en oeuvre de PAPYEX aux endroits critiques d'où une excellente jonction des éléments ;
  • le remplacement aisé d'un élément defectueux en exercant une pression par l'intermédiaire d'une cale en bois sur la partie de la clavette qui apparaît dans l'encoche et qui présente la plus petite surface : on débloque ainsi cette partie et libère l'autre de sorte que les éléments peuvent être séparés.
The invention has many advantages and in particular:
  • the exclusive presence of graphite, which leads to a great homogeneity of the expansion coefficients throughout the resistor and therefore a virtual absence of anomalies at the junctions:
  • the use of identical elements, which facilitates their machining;
  • the implementation of PAPYEX in critical places where an excellent junction of the elements;
  • easy replacement of a defective element by exercising pressure by means of a wooden block on the part of the key which appears in the notch and which has the smallest surface: this part is released and frees the other so that the elements can be separated .

FIGURES.-FIGURES.-

L'invention sera mieux comprise à l'aide des figures jointes qui représentent :

  • figure 1 : une vue suivant une coupe perpendiculaire à l'axe du prisme d'un élément ;
  • figure 2 : une vue suivant la même coupe d'un assemblage de trois éléments ;
  • figure 3 : une vue de la figure 2 suivant une coupe A-A′ parallalèle à l'axe du prisme.
  • figure 4 : une vue partielle suivant une coupe parallèle à son axe d'un résistor constitué par la superposition de deux prismes.
The invention will be better understood using the attached figures which represent:
  • Figure 1: a view in section perpendicular to the axis of the prism of an element;
  • Figure 2: a view along the same section of an assembly of three elements;
  • Figure 3: a view of Figure 2 along a section AA 'parallel to the axis of the prism.
  • Figure 4: a partial view along a section parallel to its axis of a resistor formed by the superposition of two prisms.

Sur la figure 1, on distingue une plaque 1 dont le contour correspond à une face du résistor délimitée par les arêtes 2 et 3 et se prolonge par deux demi faces de manière à pouvoir réaliser un prisme de 2n côtés avec n plaques. Cette plaque est munie de deux encoches 4 et 5 débouchant respectivement de part et d'autre de la dite plaque et est associée à ses voisines par l'intermédiaire des faces 6 et 7 d'extrémité des dites encoches. Dans cette plaque ont été pratiqués un trou 8a de manutention et un trou 8b de positionnement.In Figure 1, there is a plate 1 whose outline corresponds to one side of the resistor bounded by the edges 2 and 3 and is extended by two half faces so as to be able to produce a prism of 2n sides with n plates. This plate is provided with two notches 4 and 5 opening respectively on either side of said plate and is associated with its neighbors by the end faces 6 and 7 of said notches. In this plate were made a hole 8a for handling and a hole 8b for positioning.

Sur la figure 2, on voit un assemblage de trois éléments 9, 10 et 11, l'élément 10 possédant deux arêtes 12 et 13. Les éléments 10 et 11 ont leur face d'extrémité respective 14 et 15 équipée de joints 16 et 17. Dans l'espace laissé libre par les encoches sont placées les deux parties 18 et 19 de la clavette. On retrouve également les trous 8a et 8b.In Figure 2, we see an assembly of three elements 9, 10 and 11, the element 10 having two edges 12 and 13. The elements 10 and 11 have their respective end faces 14 and 15 equipped with seals 16 and 17 In the space left free by the notches are placed the two parts 18 and 19 of the key. There are also holes 8a and 8b.

Sur la figure 3, sont repérés les éléments 10 et 11 avec leur face d'extrémité respective 14 et 15 équipées de leur joint 16 et 17. Dans l'espace laissé libre par les encoches sont placées les deux parties 18 et 19 de la clavette dont les faces en contact 20 et 21 s'allongent sur toute la hauteur du prisme de façon oblique.In FIG. 3, the elements 10 and 11 are marked with their respective end faces 14 and 15 equipped with their seal 16 and 17. In the space left free by the notches are placed the two parts 18 and 19 of the key whose contact faces 20 and 21 extend obliquely over the entire height of the prism.

Sur la figure 4, on voit en coupe verticale une plaque 10 constituant un des prismes placée au dessus d'une plaque 10a constituant un autre prisme, les deux prismes étant séparés l'un de l'autre par un joint 22 en PAPYEX. Dans la base de chaque plaque sont pratiqués des trous 8b et 8c de positionnement et un bouchon 23 vient se placer dans le trou 8a de manutention.In Figure 4, we see in vertical section a plate 10 constituting one of the prisms placed above a plate 10a constituting another prism, the two prisms being separated from each other by a seal 22 made of PAPYEX. In the base of each plate are made holes 8b and 8c for positioning and a plug 23 is placed in the handling hole 8a.

EXEMPLES.-EXAMPLES.-

  • 1. -On a réalisé un résistor ayant pour base un polygone à 32 côtés d'une capacité de 2,8 m³ en associant deux modules ayant chacun une hauteur de 750 mm et un contour extérieur inscrit dans un cercle de diamètre 1650 mm.1. -We made a resistor based on a polygon with 32 sides with a capacity of 2.8 m³ by combining two modules each having a height of 750 mm and an outer contour inscribed in a circle with a diameter of 1650 mm.
  • 2.-On a réalisé un résistor ayant pour base un polygone à 40 côtés d'une capacité de 14 m³ en associant quatre modules ayant chacun une hauteur de 850 mm et un contour extérieur inscrit dans un cercle de diamètre 2400 mm.2.-A resistor was made having a polygon with 40 sides with a capacity of 14 m³ by associating four modules each having a height of 850 mm and an outer contour inscribed in a circle with a diameter of 2400 mm.

Claims (4)

1.-Résistor en graphite pour four à induction dont les faces latérales sont disposées de manière à former un prisme droit et sont constituées par des plaques (1) identiques qui sont associées entre elles par leurs extrémités (6) et (7) suivant une face parallèle à l'axe du prisme caractérisé en ce que pour un prisme à 2n côtés, on a n plaques, que chacune des plaques est munie latéralement de deux encoches (4) et (5) longitudinales identiques débouchant respectivement de part et d'autre de la dite plaque et que l'association des dites plaques résulte de l'emboîtage partiel d'une des encoches dans l'encoche de l'élément voisin de manière à laisser entre elles et sur toute leur longueur un espace de section polygonale occupé par une clavette en graphite de section sensiblement voisine et partagée sur toute sa longueur en deux parties (18) et (19) se raccordant suivant une face oblique. 1.- Graphite resistor for induction furnace, the lateral faces of which are arranged so as to form a straight prism and are constituted by identical plates (1) which are associated with one another by their ends (6) and (7) according to a face parallel to the axis of the prism characterized in that for a prism with 2n sides, there are plates, that each of the plates is provided laterally with two identical longitudinal notches (4) and (5) opening respectively on either side of said plate and that the association of said plates results from the partial fitting of one of the notches in the notch of the neighboring element so as to leave between them and over their entire length a space of polygonal section occupied by a graphite key of substantially similar section and shared over its entire length in two parts (18) and (19) connecting along an oblique face. 2.-Résistor selon la revendication 1 caractérisé en ce que les faces d'extrémité des éléments sont munies de joints (16) et (17) en graphite souple. 2.- Resistor according to claim 1 characterized in that the end faces of the elements are provided with seals (16) and (17) in flexible graphite. 3.-Résistor selon la revendication 1 caractérisé en ce que les éléments sont munis de trous (8a), (8b) et (8c) parallèles ou perpendiculaires aux faces latérales. 3.- Resistor according to claim 1 characterized in that the elements are provided with holes (8a), (8b) and (8c) parallel or perpendicular to the side faces. 4.-Résistor selon la revendication 1 caractérisé en ce qu'il est constitué par la superposition de plusieurs prismes identiques par l'intermédiaire de joints. 4. Resistor according to claim 1 characterized in that it is constituted by the superposition of several identical prisms by means of seals.
EP91420455A 1990-12-21 1991-12-16 Resistor for induction furnace Withdrawn EP0493276A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9016585A FR2670984A1 (en) 1990-12-21 1990-12-21 RESISTOR FOR INDUCTION OVEN.
FR9016585 1990-12-21

Publications (1)

Publication Number Publication Date
EP0493276A1 true EP0493276A1 (en) 1992-07-01

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ID=9403919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91420455A Withdrawn EP0493276A1 (en) 1990-12-21 1991-12-16 Resistor for induction furnace

Country Status (5)

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US (1) US5299224A (en)
EP (1) EP0493276A1 (en)
JP (1) JPH04356685A (en)
CA (1) CA2057691A1 (en)
FR (1) FR2670984A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19629636A1 (en) * 1996-07-23 1998-01-29 Ald Vacuum Techn Gmbh Induction heating crucible for electrically conductive materials

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB392755A (en) * 1931-09-09 1933-05-25 Ugine Infra Improvements in or relating to induction furnaces and other apparatus using the phenomenon of variation of magnetic permeability to regulate or indicate according to temperature
US3210455A (en) * 1960-05-17 1965-10-05 Schwarzkopf Dev Company Induction furnace susceptor enclosure for developing heat by induction current and the method for producing such susceptor enclosures
FR2364590A1 (en) * 1976-09-10 1978-04-07 Lorraine Carbone Tube for inductive heating appts. - is assembled from series of graphite elements joined together by dovetail joints
EP0018554A2 (en) * 1979-04-26 1980-11-12 Siemens Aktiengesellschaft Heating device for preheating fuel oil

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU57194A1 (en) * 1968-10-30 1970-05-04
US3568611A (en) * 1968-11-12 1971-03-09 Johns Manville Furnace construction
US3775091A (en) * 1969-02-27 1973-11-27 Interior Induction melting of metals in cold, self-lined crucibles
US4411621A (en) * 1980-12-05 1983-10-25 Miller Thomas M Furnace wall construction
US4638617A (en) * 1984-10-19 1987-01-27 Merkle Engineers, Inc. Refractory curtain wall
US4900249A (en) * 1987-01-12 1990-02-13 Dresser Industries, Inc. Aluminum reverberatory furnace lining

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB392755A (en) * 1931-09-09 1933-05-25 Ugine Infra Improvements in or relating to induction furnaces and other apparatus using the phenomenon of variation of magnetic permeability to regulate or indicate according to temperature
US3210455A (en) * 1960-05-17 1965-10-05 Schwarzkopf Dev Company Induction furnace susceptor enclosure for developing heat by induction current and the method for producing such susceptor enclosures
FR2364590A1 (en) * 1976-09-10 1978-04-07 Lorraine Carbone Tube for inductive heating appts. - is assembled from series of graphite elements joined together by dovetail joints
EP0018554A2 (en) * 1979-04-26 1980-11-12 Siemens Aktiengesellschaft Heating device for preheating fuel oil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19629636A1 (en) * 1996-07-23 1998-01-29 Ald Vacuum Techn Gmbh Induction heating crucible for electrically conductive materials
US5991328A (en) * 1996-07-23 1999-11-23 Ald Vacuum Technologies Gmbh Crucible for the inductive melting or superheating of metals, alloys, or other electrically conductive materials

Also Published As

Publication number Publication date
FR2670984B1 (en) 1993-02-26
JPH04356685A (en) 1992-12-10
FR2670984A1 (en) 1992-06-26
US5299224A (en) 1994-03-29
CA2057691A1 (en) 1992-06-22

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