EP0576351A1 - Protecting and cooling arrangement for the poles of an electromagnetic inductor - Google Patents

Protecting and cooling arrangement for the poles of an electromagnetic inductor Download PDF

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Publication number
EP0576351A1
EP0576351A1 EP93401604A EP93401604A EP0576351A1 EP 0576351 A1 EP0576351 A1 EP 0576351A1 EP 93401604 A EP93401604 A EP 93401604A EP 93401604 A EP93401604 A EP 93401604A EP 0576351 A1 EP0576351 A1 EP 0576351A1
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EP
European Patent Office
Prior art keywords
tubes
pipes
poles
tube
cooling fluid
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Withdrawn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
EP93401604A
Other languages
German (de)
French (fr)
Inventor
Claude Couffet
Jean Hellegouarc'h
Gérard Prost
Jean Camille Uring
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.)
Celes Ste
Celes SA
Original Assignee
Celes Ste
Celes SA
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Publication date
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Application filed by Celes Ste, Celes SA filed Critical Celes Ste
Publication of EP0576351A1 publication Critical patent/EP0576351A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/42—Cooling of coils

Definitions

  • the present invention relates to a device for protecting and cooling the poles of an electromagnetic inductor.
  • induction furnaces are frequently used, generally comprising a planar inductor which is provided with a thermal protection system comprising in particular an internal circulation of a cooling fluid.
  • this thermal protection system is generally constituted in the form of a thermal screen produced by the assembly of metal tubes placed side by side and supplied with cooling fluid and connected to pipes of coolant inlet and outlet.
  • the invention therefore relates to a device for thermal protection and cooling of the poles of an electromagnetic inductor, in particular for an induction furnace, of the type constituted by a plurality of tubes placed side by side and, substantially coplanar, in which a fluid circulates. cooling characterized in that the connection of said tubes on the incoming and outgoing pipes of the cooling fluid is carried out by means designed so as to ensure both an electrical discontinuity and the seal between each tube and said pipes.
  • the means ensuring the connection of the tubes to the inlet and outlet pipes of the cooling fluid consist of a bushing, welded or brazed on said pipe and in which is engaged the end of the tube opening into said pipe, seals and electrical insulation being interposed between said socket and said tube.
  • the tubes can be made of a magnetic or non-magnetic metal, preferably of non-magnetic stainless steel, or of an electrically insulating material.
  • the device for protecting the poles of the inductor is in the form of a heat shield, generally designated by the reference 10 and which is constituted by a plurality of tubes such as 16 arranged next to each other in a substantially coplanar configuration.
  • These tubes can be made of a magnetic or non-magnetic material or else of insulating materials.
  • the tubes 16 are connected at their ends respectively to a pipe 12 for the arrival of a cooling fluid, for example water and to a pipe 14 through which the fluid is discharged. cooling after circulation through the bundle of tubes 16.
  • a cooling fluid for example water
  • the invention provides the connection or connection between the ends of the tubes 16 and the pipes 12 and 14 so as to ensure both the sealing of the coolant and the electrical insulation between these ends and the said pipes .
  • this connection means consists of a socket 20, open at its two ends and engaged inside one of the pipes such as 14 or 12 , this sleeve being welded or brazed to said pipe.
  • Each socket is made so as to receive the end of a tube 16 opening into the pipe 14 or 12.
  • seals such as 22 are provided, for example, O-rings made of insulating material.
  • the magnetic field is not interrupted by the thermal protection screen according to the invention which is completely transparent to the magnetic flux.
  • the solution provided by the invention is particularly simple and inexpensive to produce, that it is -easy to implement and that, in addition, it allows rapid and uncomplicated replacement of one or more of several of the tubes 16 of the screen 10 which considerably facilitates the maintenance operations of the inductors thus equipped.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)

Abstract

Arrangement for thermal protection and cooling of the poles of an electromagnetic inductor, especially for an induction furnace, of the type consisting of a plurality of tubes, arranged side by side and substantially coplanar and in which there flows a cooling fluid, characterised in that the connecting of the said tubes (16) to the pipes (12, 14) for leading in and leading out the cooling fluid is produced by a means (18) designed so as to ensure both electrical discontinuity and leaktightness between each tube and the said pipes. <IMAGE>

Description

La présente invention concerne un dispositif de protection et de refroidissement des pôles d'un inducteur électro-magnétique.The present invention relates to a device for protecting and cooling the poles of an electromagnetic inductor.

On sait que pour assurer le traitement thermique de produits métallurgiques, on utilise fréquemment des fours à induction comportant généralement un inducteur plan qui est pourvu d'un système de protection thermique comportant notamment une circulation interne d'un fluide de refroidissement. Dans les fours de ce type actuellement réalisés, ce système de protection thermique est constitué généralement sous la forme d'un écran thermique réalisé par l'assemblage de tubes métalliques placés côte à côte et alimentés en fluide de refroidissement et raccordés à des canalisations d'arrivée et de sortie du fluide de refroidissement.It is known that to ensure the heat treatment of metallurgical products, induction furnaces are frequently used, generally comprising a planar inductor which is provided with a thermal protection system comprising in particular an internal circulation of a cooling fluid. In ovens of this type currently produced, this thermal protection system is generally constituted in the form of a thermal screen produced by the assembly of metal tubes placed side by side and supplied with cooling fluid and connected to pipes of coolant inlet and outlet.

La difficulté de réalisation d'un tel écran thermique est due au fait qu'il ne doit pas constituer un écran magnétique c'est-à-dire qu'il doit être le plus transparent possible au champ magnétique. Or, sur ce plan particulier, les solutions actuelles ne donnent pas toute satisfaction et, pour cette raison, la présente invention s'est fixé pour objectif d'apporter un nouveau dispositif du type écran thermique perfectionné par rapport aux réalisations actuelles.The difficulty in producing such a heat screen is due to the fact that it must not constitute a magnetic screen, that is to say that it must be as transparent as possible to the magnetic field. However, on this particular level, the current solutions are not entirely satisfactory and, for this reason, the present invention has set itself the objective of providing a new device of the thermal screen type which is improved compared to current embodiments.

L'invention concerne donc un dispositif de protection thermique et de refroidissement des pôles d'un inducteur électro-magnétique, notamment pour four à induction, du type constitué par une pluralité de tubes placés côté à côte et, sensiblement coplanaires dans lesquels circule un fluide de refroidissement caractérisé en ce que le raccordement desdits tubes sur les canalisations d'arrivée et de sortie du fluide de refroidissement est réalisé par un moyen conçu de façon à assurer à la fois une discontinuité électrique et l'étanchéité entre chaque tube et lesdites canalisations.The invention therefore relates to a device for thermal protection and cooling of the poles of an electromagnetic inductor, in particular for an induction furnace, of the type constituted by a plurality of tubes placed side by side and, substantially coplanar, in which a fluid circulates. cooling characterized in that the connection of said tubes on the incoming and outgoing pipes of the cooling fluid is carried out by means designed so as to ensure both an electrical discontinuity and the seal between each tube and said pipes.

Selon un mode de réalisation préféré du dispositif objet de l'invention, le moyen assurant le raccordement des tubes sur les canalisations d'arrivée et de sortie du fluide de refroidissement consistent en une douille, soudée ou brasée sur ladite canalisation et dans laquelle est engagée l'extrémité du tube débouchant dans ladite canalisation, des joints d'étanchéité et d'isolation électrique étant interposés entre ladite douille et ledit tube.According to a preferred embodiment of the device which is the subject of the invention, the means ensuring the connection of the tubes to the inlet and outlet pipes of the cooling fluid consist of a bushing, welded or brazed on said pipe and in which is engaged the end of the tube opening into said pipe, seals and electrical insulation being interposed between said socket and said tube.

Selon un autre mode de réalisation de l'invention, les tubes peuvent être réalisés en un métal magnétique ou amagnétique, de préférence en acier inoxydable amagnétique, ou en matériau électriquement isolant.According to another embodiment of the invention, the tubes can be made of a magnetic or non-magnetic metal, preferably of non-magnetic stainless steel, or of an electrically insulating material.

D'autres caractéristiques et avantages de la présente invention ressortiront de la description faite ci-après en référence au dessin annexé qui en illustre un exemple de réalisation dépourvu de tout caractère limitatif. Sur le dessin :

  • la figure 1 est une vue en élévation latérale d'un écran de protection thermique réalisé selon la présente invention et ,
  • la figure 2 est une vue en détail à échelle agrandie représentant le moyen mis en oeuvre par l'invention pour assurer la liaison entre les tubes de l'écran thermique et les canalisations d'arrivée et de départ du fluide de refroidissement, cette vue étant une coupe par un plan perpendiculaire à l'axe d'une canalisation et passant par l'axe du tube concerné.
Other characteristics and advantages of the present invention will emerge from the description given below with reference to the appended drawing which illustrates an embodiment thereof devoid of any limiting character. On the drawing :
  • FIG. 1 is a side elevation view of a thermal protection screen produced according to the present invention and,
  • Figure 2 is a detailed view on an enlarged scale showing the means used by the invention to ensuring the connection between the heat shield tubes and the incoming and outgoing coolant pipes, this view being a section through a plane perpendicular to the axis of a pipe and passing through the axis of the tube concerned.

Pour simplifier le dessin, on n'a pas représenté la structure de l'inducteur auquel s'applique le dispositif objet de l'invention. Il s'agit là d'un élément bien connu de l'homme de l'art, qui ne fait pas partie de l'invention mais qu'il ne semble pas nécessaire de décrire.
En se référant au dessin et plus particulièrement à la figure 1, on voit que le dispositif de protection des pôles de l'inducteur se présente sous la forme d'un écran thermique, désigné dans son ensemble par la référence 10 et qui est constitué par une pluralité de tubes tels que 16 disposés les uns à côté des autres selon une configuration sensiblement coplanaire. Ces tubes peuvent être réalisés en un matériau magnétique ou amagnétique ou bien en matériaux isolants.To simplify the drawing, the structure of the inductor to which the device which is the subject of the invention is not shown. This is an element well known to those skilled in the art, which is not part of the invention but which does not seem necessary to describe.
Referring to the drawing and more particularly to FIG. 1, it can be seen that the device for protecting the poles of the inductor is in the form of a heat shield, generally designated by the reference 10 and which is constituted by a plurality of tubes such as 16 arranged next to each other in a substantially coplanar configuration. These tubes can be made of a magnetic or non-magnetic material or else of insulating materials.

Selon l'invention les tubes 16 sont raccordés par leurs extrémités respectivement à une canalisation 12 d'arrivée d'un fluide de refroidissement, par exemple de l'eau et à une canalisation 14 au travers de laquelle s'effectue l'évacuation du fluide de refroidissement après circulation au travers du faisceau de tubes 16.According to the invention, the tubes 16 are connected at their ends respectively to a pipe 12 for the arrival of a cooling fluid, for example water and to a pipe 14 through which the fluid is discharged. cooling after circulation through the bundle of tubes 16.

Il est nécessaire que l'écran thermique 10 ainsi réalisé soit transparent au champ magnétique développé par l'inducteur. Dans ce but, l'invention réalise la liaison ou le raccordement entre les extrémités des tubes 16 et les canalisations 12 et 14 de manière à assurer à la fois l'étanchéité au fluide de refroidissement et l'isolation électrique entre ces extrémités et lesdites canalisations.It is necessary that the heat shield 10 thus produced is transparent to the magnetic field developed by the inductor. To this end, the invention provides the connection or connection between the ends of the tubes 16 and the pipes 12 and 14 so as to ensure both the sealing of the coolant and the electrical insulation between these ends and the said pipes .

Sur la figure 1 le moyen de raccordement ainsi mis en oeuvre a été désigné dans son ensemble par la référence 18 et la figure 2 le représente de façon détaillée. Ainsi qu'on le voit sur cette figure, dans cet exemple de réalisation non limitatif, ce moyen de raccordement consiste en une douille 20, ouverte à ses deux extrémités et engagées à l'intérieur de l'une des canalisations telles que 14 ou 12, cette douille étant soudée ou brasée sur ladite canalisation. Chaque douille est réalisée de façon à recevoir l'extrémité d'un tube 16 débouchant dans la canalisation 14 ou 12. Pour assurer à la fois l'étanchéité et l'isolation électrique entre le tube 16 considéré et la canalisation telle que 14 à laquelle il est ainsi raccordé, on prévoit des joints tels que 22 par exemple, des joints toriques en matériau isolant.In Figure 1 the connecting means thus implemented has been designated as a whole by the reference 18 and Figure 2 shows it in detail. As can be seen in this figure, in this nonlimiting exemplary embodiment, this connection means consists of a socket 20, open at its two ends and engaged inside one of the pipes such as 14 or 12 , this sleeve being welded or brazed to said pipe. Each socket is made so as to receive the end of a tube 16 opening into the pipe 14 or 12. To ensure both sealing and electrical insulation between the pipe 16 considered and the pipe such as 14 at which it is thus connected, seals such as 22 are provided, for example, O-rings made of insulating material.

Grâce à cette disposition, le champ magnétique n'est pas interrompu par l'écran de protection thermique selon l'invention qui est totalement transparent au flux magnétique. On remarquera que la solution apportée par l'invention est de réalisation particulièrement simple et peu coûteuse, qu'elle est -facile à mettre en oeuvre et qu'en outre, elle permet d'assurer un remplacement rapide et peu compliqué d'un ou de plusieurs des tubes 16 de l'écran 10 ce qui facilité considérablement les opérations de maintenance des inducteurs ainsi équipés.Thanks to this arrangement, the magnetic field is not interrupted by the thermal protection screen according to the invention which is completely transparent to the magnetic flux. It will be noted that the solution provided by the invention is particularly simple and inexpensive to produce, that it is -easy to implement and that, in addition, it allows rapid and uncomplicated replacement of one or more of several of the tubes 16 of the screen 10 which considerably facilitates the maintenance operations of the inductors thus equipped.

Il demeure bien entendu que la présente invention n'est pas limitée aux exemples de réalisation décrits et/ou représentés ici mais qu'elle en englobe toutes les variantes.It remains to be understood that the present invention is not limited to the embodiments described and / or shown here but that it encompasses all variants thereof.

Claims (5)

1 - Dispositif de protection thermique et de refroidissement des pôles d'un inducteur électro-magnétique, notamment pour four à induction, du type constitué par une pluralité de tubes, disposés côte à côte et sensiblement coplanaires dans lesquels circule un fluide de refroidissement caractérisé en ce que le raccordement desdits tubes (16) sur les canalisations (12, 14) d'arrivée et de sortie du fluide de refroidissement est réalisé par un moyen (18) conçu de façon à assurer à la fois une discontinuité électrique et l'étanchéité entre chaque tube et lesdites canalisations. 1 - Device for thermal protection and cooling of the poles of an electromagnetic inductor, in particular for an induction furnace, of the type constituted by a plurality of tubes, arranged side by side and substantially coplanar in which a cooling fluid circulates, characterized in that the connection of said tubes (16) on the pipes (12, 14) of inlet and outlet of the cooling fluid is carried out by means (18) designed so as to ensure both electrical discontinuity and sealing between each tube and said pipes. 2 - Dispositif selon la revendication 1 caractérisé en ce que le moyen (18) assurant le raccordement des tubes (16) sur les canalisations (12, 14) d'arrivée et de sortie du fluide de refroidissement consistent en une douille (20), soudée ou brasée sur ladite canalisation et dans laquelle est engagée l'extrémité du tube débouchant dans ladite canalisation, des joints d'étanchéité et d'isolation électrique (22) étant interposés entre ladite douille et ledit tube. 2 - Device according to claim 1 characterized in that the means (18) ensuring the connection of the tubes (16) on the pipes (12, 14) of inlet and outlet of the coolant consist of a socket (20), welded or brazed to said pipe and in which is engaged the end of the tube opening into said pipe, seals and electrical insulation (22) being interposed between said socket and said tube. 3 - Dispositif selon l'une des revendications précédentes caractérisé en ce que les tubes (16) sont réalisés en un métal magnétique. 3 - Device according to one of the preceding claims characterized in that the tubes (16) are made of a magnetic metal. 4 - Dispositif selon l'une des revendications 1 ou 2 caractérisé en ce que les tubes (16) sont réalisés en un métal amagnétique, de préférence en acier inoxydable amagnétique. 4 - Device according to one of claims 1 or 2 characterized in that the tubes (16) are made of a non-magnetic metal, preferably non-magnetic stainless steel. 5 - Dispositif selon l'une des revendications 1 ou 2 caractérisé en ce que les tubes (16) sont réalisés en un matériau électriquement isolant. 5 - Device according to one of claims 1 or 2 characterized in that the tubes (16) are made of an electrically insulating material.
EP93401604A 1992-06-24 1993-06-22 Protecting and cooling arrangement for the poles of an electromagnetic inductor Withdrawn EP0576351A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9207739A FR2693073A1 (en) 1992-06-24 1992-06-24 Device for protecting and cooling the poles of an electromagnetic inductor.
FR9307739 1992-06-24

Publications (1)

Publication Number Publication Date
EP0576351A1 true EP0576351A1 (en) 1993-12-29

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EP93401604A Withdrawn EP0576351A1 (en) 1992-06-24 1993-06-22 Protecting and cooling arrangement for the poles of an electromagnetic inductor

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US (1) US5485483A (en)
EP (1) EP0576351A1 (en)
JP (1) JPH0636870A (en)
FR (1) FR2693073A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2782883A1 (en) * 1998-08-31 2000-03-03 Philec Sa Bus-pipe connections for inductor with parallel liquid-cooled conductor coils, comprises additional pipe section giving identical current and coolant flow directions in both bus-pipes

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2781437A (en) * 1953-09-10 1957-02-12 Magnethermic Corp Induction furnaces
EP0020215A1 (en) * 1979-05-23 1980-12-10 INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France Induction reheating furnace with travelling field
EP0053070A1 (en) * 1980-11-21 1982-06-02 INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France Metallurgical ladle for inductive treatment of metals
EP0340057A1 (en) * 1988-04-26 1989-11-02 Rotelec Protecting device for induction poles and inductor provided with this device
WO1991006194A1 (en) * 1989-10-13 1991-05-02 Eduard Küsters Maschinenfabrik GmbH & Co. KG Coil body for the inductive heating of rollers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5125004A (en) * 1991-01-30 1992-06-23 Consarc Composition Vacuum induction melting assembly having simultaneously activated cooling and power connections

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2781437A (en) * 1953-09-10 1957-02-12 Magnethermic Corp Induction furnaces
EP0020215A1 (en) * 1979-05-23 1980-12-10 INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France Induction reheating furnace with travelling field
EP0053070A1 (en) * 1980-11-21 1982-06-02 INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France Metallurgical ladle for inductive treatment of metals
EP0340057A1 (en) * 1988-04-26 1989-11-02 Rotelec Protecting device for induction poles and inductor provided with this device
WO1991006194A1 (en) * 1989-10-13 1991-05-02 Eduard Küsters Maschinenfabrik GmbH & Co. KG Coil body for the inductive heating of rollers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2782883A1 (en) * 1998-08-31 2000-03-03 Philec Sa Bus-pipe connections for inductor with parallel liquid-cooled conductor coils, comprises additional pipe section giving identical current and coolant flow directions in both bus-pipes

Also Published As

Publication number Publication date
FR2693073A1 (en) 1993-12-31
US5485483A (en) 1996-01-16
JPH0636870A (en) 1994-02-10

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