EP1491073A2 - Improvements to heating inductors, in particular of metal strips - Google Patents

Improvements to heating inductors, in particular of metal strips

Info

Publication number
EP1491073A2
EP1491073A2 EP03745813A EP03745813A EP1491073A2 EP 1491073 A2 EP1491073 A2 EP 1491073A2 EP 03745813 A EP03745813 A EP 03745813A EP 03745813 A EP03745813 A EP 03745813A EP 1491073 A2 EP1491073 A2 EP 1491073A2
Authority
EP
European Patent Office
Prior art keywords
inductor
strip
edges
deflectors
heating system
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Withdrawn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
EP03745813A
Other languages
German (de)
French (fr)
Inventor
Gérard PFISTER
Rémy KLEIN
Aldo Grimaz
Philippe Roehr
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 SA
Original Assignee
Celes 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 Celes SA filed Critical Celes SA
Publication of EP1491073A2 publication Critical patent/EP1491073A2/en
Withdrawn legal-status Critical Current

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
    • 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
    • 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

Definitions

  • the present invention relates to improvements made to heating inductors, in particular of metal products in strips.
  • the shape of the turns of the inductor 3 is improved so as to adapt the value of the magnetic field on the edges 2 of the strip 1.
  • the inductor has a so-called shape in "dog bone” so as to apply a weaker magnetic field on the edges 2 of the strip than in the center of the latter.
  • the disadvantage of this known solution lies in that it can generate perfect heating only for a determined width of the metal strip 1 to be heated.
  • the solution illustrated in FIG. 2 consists in deflecting the magnetic field by " implementing bars such as 5, with high permeability, these bars, possibly mobile, being positioned along the edges 2 of the strip 1.
  • the correction is only perfect for a determined width of strip, which leads to the need to make the magnetic bars 5 mobile, as a function of the width of the strip to be heated. This solution is therefore not practical to implement on an industrial level.
  • the present invention therefore proposes to provide another solution to this problem of overheating the edges of the bands heated by induction, this solution does not have the drawbacks of the known solutions described above and which can be implemented whatever the width of the heated strip.
  • the subject of the invention is a system for the induction heating of metallic products, in particular strips, with longitudinal magnetic flux, characterized in that the inductor comprises, inside the latter, two magnetic field deflectors. whose shape and arrangement are chosen so that they mask the coils of the inductor at the edges of the strip.
  • the deflectors are U-shaped whose branches cover the edges of the strip to be heated and they can be arranged over all or part of the length of the inductor.
  • FIG. 3 of which is a schematic perspective view illustrating an example of non-limiting embodiment of a heating system according to the invention.
  • the reference inductor 6 designates the longitudinal magnetic flux heating inductor inside which the strip 1 to be heated circulates continuously.
  • two magnetic field deflectors 7 and 7 ′ are introduced inside its inductor, between its turns, as can be clearly seen in FIG. 3, which are designed and arranged so as to mask, over all or part of the length of the inductor, the turns of the latter at the edges 2 of the strip to be heated.
  • These deflectors therefore constitute screens with the magnetic field of the inductor causing the banks to underheat.
  • the deflectors 7 and 7 ′ are U-shaped, the branches of which cover the edges 2 of the strip 1.
  • the correction made to the heating is constant whatever the width of the heated strip, which makes it possible to fix the deflectors and to allow use in industrial production of the solution provided by the invention;
  • the U-shaped screens located inside the inductor can have ends which are shaped so as to increase their efficiency.

Landscapes

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

Abstract

The invention concerns a heating system by induction of metal products, in particular metal strips, with longitudinal magnetic flux, characterized in that the inductor (6) comprises between its coils, two magnetic field deflectors (7, 7') whereof the shape and arrangement are selected such that they mask the inductor coils at the edges (2) of the strip (1).

Description

La présente invention est relative à des perfectionnements apportés aux inducteurs de chauffage, notamment de produits métalliques en bandes. The present invention relates to improvements made to heating inductors, in particular of metal products in strips.
Lors du chauffage par induction d'une bande métallique à l'aide d'un inducteur à flux magnétique longitudinal, on observe une surchauffe des rives de la bande par rapport à sa partie centrale. Cette surchauffe est d'autant plus importante que la fréquence du courant d'alimentation de l'inducteur est élevée. Or, cette augmentation de fréquence constitue à l'heure actuelle une évolution importante de la technologie dans ce domaine technique particulier étant donné qu'elle permet de réaliser des installations de chauffage de grande compacité. Afin de résoudre ce problème de surchauffe des rives de la bande, l'Homme de l'art dispose à l'heure actuelle notamment des deux solutions qui sont représentées de façon schématique sur les figures 1 et 2 des dessins annexés, ces figures étant des vues en coupe verticale des inducteurs de chauffage.During the induction heating of a metal strip using a longitudinal magnetic flux inductor, the edges of the strip are overheated with respect to its central part. This overheating is all the more important the higher the frequency of the inductor supply current. However, this increase in frequency currently constitutes an important development in technology in this particular technical field since it makes it possible to produce very compact heating installations. In order to solve this problem of overheating of the edges of the strip, those skilled in the art currently have in particular two solutions which are shown diagrammatically in FIGS. 1 and 2 of the appended drawings, these figures being vertical section views of the heating inductors.
Dans la solution selon la figure 1, on améliore la forme des spires de l'inducteur 3 de manière à adapter la valeur du champ magnétique sur les rives 2 de la bande 1. Dans la solution ainsi illustrée, l'inducteur présente une forme dite en « os de chien » de façon à appliquer un champ magnétique plus faible sur les rives 2 de la bande qu'au centre de cette dernière. L'inconvénient de cette solution connue réside en ce qu'elle ne peut générer un chauffage parfait que pour une largeur déterminée de la bande métallique 1 à chauffer.In the solution according to FIG. 1, the shape of the turns of the inductor 3 is improved so as to adapt the value of the magnetic field on the edges 2 of the strip 1. In the solution thus illustrated, the inductor has a so-called shape in "dog bone" so as to apply a weaker magnetic field on the edges 2 of the strip than in the center of the latter. The disadvantage of this known solution lies in that it can generate perfect heating only for a determined width of the metal strip 1 to be heated.
La solution illustrée par la figure 2 consiste à dévier le champ magnétique en mettant en "œuvre des barreaux tels que 5, à haute perméabilité, ces barreaux, éventuellement mobiles, étant positionnés le long des rives 2 de la bande 1. Dans cette solution connue, on retrouve le même inconvénient que dans la solution décrite ci-dessus en référence à la figure 1 : la correction n'est parfaite que pour une largeur déterminée de bande, ce qui entraîne la nécessité de rendre mobile les barreaux magnétiques 5, en fonction de la largeur de la bande à chauffer. Cette solution n'est donc pas pratique à mettre en œuvre sur le plan industriel .The solution illustrated in FIG. 2 consists in deflecting the magnetic field by " implementing bars such as 5, with high permeability, these bars, possibly mobile, being positioned along the edges 2 of the strip 1. In this known solution, we find the same drawback as in the solution described above with reference to the figure 1: the correction is only perfect for a determined width of strip, which leads to the need to make the magnetic bars 5 mobile, as a function of the width of the strip to be heated. This solution is therefore not practical to implement on an industrial level.
La présente invention se propose donc d'apporter une autre solution à ce problème de la surchauffe des rives des bandes chauffées par induction, cette solution, ne présentant pas les inconvénients des solutions connues décrites ci-dessus et pouvant être mise en œuvre quelle que soit la largeur de la bande chauffée.The present invention therefore proposes to provide another solution to this problem of overheating the edges of the bands heated by induction, this solution does not have the drawbacks of the known solutions described above and which can be implemented whatever the width of the heated strip.
En conséquence, l'invention a pour objet un système de chauffage par induction de produits métalliques, notamment des bandes, à flux magnétique longitudinal, caractérisé en ce que l'inducteur comporte à l'intérieur de celui-ci, deux déflecteurs de champ magnétique dont la forme et la disposition sont choisies de façon qu'ils masquent les spires de l'inducteur au niveau des rives de la bande. Selon la présente invention, les déflecteurs sont en forme de U dont les branches recouvrent les rives de la bande à chauffer et ils peuvent être disposés sur tout ou partie de la longueur de l'inducteur.Consequently, the subject of the invention is a system for the induction heating of metallic products, in particular strips, with longitudinal magnetic flux, characterized in that the inductor comprises, inside the latter, two magnetic field deflectors. whose shape and arrangement are chosen so that they mask the coils of the inductor at the edges of the strip. According to the present invention, the deflectors are U-shaped whose branches cover the edges of the strip to be heated and they can be arranged over all or part of the length of the inductor.
D'autres caractéristiques et avantages de la présente invention ressortiront de la description faite ci-après, en référence au dessin annexé dont la figure 3 est une vue schématique en perspective illustrant un exemple de réalisation non limitatif d'un système de chauffage selon 1' invention.Other characteristics and advantages of the present invention will emerge from the description given below, with reference to the appended drawing, FIG. 3 of which is a schematic perspective view illustrating an example of non-limiting embodiment of a heating system according to the invention.
En se référant à la figure 3, on a désigné par la référence 6 l'inducteur de chauffage à flux magnétique longitudinal à l'intérieur duquel circule en continu la bande 1 à chauffer.Referring to FIG. 3, the reference inductor 6 designates the longitudinal magnetic flux heating inductor inside which the strip 1 to be heated circulates continuously.
Selon l'invention, on introduit à l'intérieur de l'inducteur, entre ses spires, ainsi qu'on le voit clairement sur la figure 3, deux déflecteurs de champ magnétique respectivement 7 et 7' qui sont conçus et disposés de façon à masquer, sur tout ou partie de la longueur de l'inducteur, les spires de ce dernier au niveau des rives 2 de la bande à chauffer. Ces déflecteurs constituent donc des écrans au champ magnétique de l'inducteur provoquant une sous-chauffe des rives.According to the invention, two magnetic field deflectors 7 and 7 ′ are introduced inside its inductor, between its turns, as can be clearly seen in FIG. 3, which are designed and arranged so as to mask, over all or part of the length of the inductor, the turns of the latter at the edges 2 of the strip to be heated. These deflectors therefore constitute screens with the magnetic field of the inductor causing the banks to underheat.
Dans l'exemple de réalisation illustré par la figure 3, les déflecteurs 7 et 7' sont en forme de U dont les branches recouvrent les rives 2 de la bande 1.In the embodiment illustrated in FIG. 3, the deflectors 7 and 7 ′ are U-shaped, the branches of which cover the edges 2 of the strip 1.
Les avantages et effets techniques apportés par l'invention sont notamment les suivants :The advantages and technical effects provided by the invention are in particular the following:
- la correction apportée au chauffage est constante quelle que soit la largeur de la bande chauffée, ce qui permet de fixer les déflecteurs et de permettre une utilisation en production industrielle de la solution apportée par l'invention ;the correction made to the heating is constant whatever the width of the heated strip, which makes it possible to fix the deflectors and to allow use in industrial production of the solution provided by the invention;
- en choisissant une épaisseur appropriée des déflecteurs, ceux-ci ne sont pas le siège de pertes électriques trop importantes et- by choosing an appropriate thickness of the deflectors, these are not the seat of excessive electrical losses and
- aucun réglage n'est nécessaire. II demeure bien entendu que la présente invention n'est pas limitée aux exemples de réalisation décrits et représentés ci-dessus, mais qu'elle en englobe toutes les variantes .- no adjustment is necessary. It remains to be understood that the present invention is not limited to the embodiments described and shown above, but that it encompasses all variants.
C'est ainsi que, par exemple, les écrans en U situés à 1 ' intérieur de 1 ' inducteur peuvent comporter des extrémités qui sont conformées de manière à augmenter leur efficacité. Thus, for example, the U-shaped screens located inside the inductor can have ends which are shaped so as to increase their efficiency.

Claims

REVENDICATIONS
1 - Système de chauffage par induction de produits métalliques, notamment des bandes, à flux magnétique longitudinal, caractérisé en ce que l'inducteur (6) comporte à l'intérieur, deux déflecteurs de champ magnétique (7, 7') dont la forme et la disposition sont choisies de façon qu'ils masquent les spires de l'inducteur au niveau des rives (2) de la bande (1) . 2 - Système de chauffage selon la revendication 1, caractérisé en ce que les déflecteurs (7, 7') sont en forme de U dont les branches recouvrent les rives (2) de la bande à chauffer.1 - Induction heating system for metallic products, in particular strips, with longitudinal magnetic flux, characterized in that the inductor (6) has inside, two magnetic field deflectors (7, 7 ') whose shape and the arrangement are chosen so that they mask the turns of the inductor at the edges (2) of the strip (1). 2 - Heating system according to claim 1, characterized in that the deflectors (7, 7 ') are U-shaped whose branches cover the edges (2) of the strip to be heated.
3 - Système de chauffage selon l'une des revendications 1 ou 2, caractérisé en ce que les déflecteurs (7, 7') sont disposés sur tout ou partie de la longueur de l'inducteur (6).3 - Heating system according to one of claims 1 or 2, characterized in that the deflectors (7, 7 ') are arranged over all or part of the length of the inductor (6).
4 - Système de chauffage selon l'une des revendications 1 ou 2, caractérisé en ce que les écrans en U situés à l'intérieur de l'inducteur comportent des extrémités qui sont conformées de manière à augmenter leur efficacité. 4 - Heating system according to one of claims 1 or 2, characterized in that the U-shaped screens located inside the inductor have ends which are shaped so as to increase their efficiency.
EP03745813A 2002-04-04 2003-04-02 Improvements to heating inductors, in particular of metal strips Withdrawn EP1491073A2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0204218 2002-04-04
FR0204218A FR2838282B1 (en) 2002-04-04 2002-04-04 IMPROVEMENTS IN OR RELATING TO HEATING INDUCERS, ESPECIALLY METAL STRIPS
PCT/FR2003/001033 WO2003086020A2 (en) 2002-04-04 2003-04-02 Improvements to heating inductors, in particular of metal strips

Publications (1)

Publication Number Publication Date
EP1491073A2 true EP1491073A2 (en) 2004-12-29

Family

ID=28052116

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03745813A Withdrawn EP1491073A2 (en) 2002-04-04 2003-04-02 Improvements to heating inductors, in particular of metal strips

Country Status (10)

Country Link
US (1) US20060124633A1 (en)
EP (1) EP1491073A2 (en)
JP (1) JP2005522014A (en)
KR (1) KR20050005432A (en)
AU (1) AU2003246766A1 (en)
BR (1) BR0308906A (en)
CA (1) CA2480899A1 (en)
FR (1) FR2838282B1 (en)
WO (1) WO2003086020A2 (en)
ZA (1) ZA200407912B (en)

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EP2639578B1 (en) * 2006-12-14 2016-09-14 Life Technologies Corporation Apparatus for measuring analytes using large scale fet arrays
JP4912912B2 (en) * 2007-02-16 2012-04-11 新日本製鐵株式会社 Induction heating device
DE102009006949A1 (en) 2009-01-30 2010-08-05 Vatron Gmbh Inductor for heating flat material, has conductor sections shaped to form windings, where opposing current flow directions are produced below conductor sections running on same sides of windings in parallel
CA2789978C (en) 2010-02-19 2015-11-24 Nippon Steel Corporation Transverse flux induction heating device
DE102011004530A1 (en) 2010-12-15 2012-06-21 Mahle International Gmbh heater
EP3439430B1 (en) * 2016-03-30 2023-08-23 Nippon Steel Corporation Induction heating device and induction heating method

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US4550412A (en) * 1984-01-06 1985-10-29 The United States Of America As Represented By The United States Department Of Energy Carbon-free induction furnace
JPS62281291A (en) * 1986-05-30 1987-12-07 新日本製鐵株式会社 Induction heater
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Also Published As

Publication number Publication date
CA2480899A1 (en) 2003-10-16
FR2838282A1 (en) 2003-10-10
AU2003246766A1 (en) 2003-10-20
US20060124633A1 (en) 2006-06-15
BR0308906A (en) 2005-01-04
ZA200407912B (en) 2005-07-04
FR2838282B1 (en) 2004-06-11
KR20050005432A (en) 2005-01-13
WO2003086020A2 (en) 2003-10-16
JP2005522014A (en) 2005-07-21
WO2003086020A3 (en) 2004-04-01

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