FR2840501A1 - Heating coil for metallic strip, comprises turns which present a concave outline for the coil such that the edges of strip being heated receive lower magnetic field than centre to give even heating - Google Patents
Heating coil for metallic strip, comprises turns which present a concave outline for the coil such that the edges of strip being heated receive lower magnetic field than centre to give even heating Download PDFInfo
- Publication number
- FR2840501A1 FR2840501A1 FR0206570A FR0206570A FR2840501A1 FR 2840501 A1 FR2840501 A1 FR 2840501A1 FR 0206570 A FR0206570 A FR 0206570A FR 0206570 A FR0206570 A FR 0206570A FR 2840501 A1 FR2840501 A1 FR 2840501A1
- Authority
- FR
- France
- Prior art keywords
- strip
- edges
- heating
- magnetic field
- coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 19
- 238000013021 overheating Methods 0.000 claims description 5
- 230000004907 flux Effects 0.000 claims description 4
- 230000006698 induction Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 150000001768 cations Chemical class 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 3
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
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
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
- H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
- H05B6/104—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor metal pieces being elongated like wires or bands
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Induction Heating (AREA)
Abstract
Description
installe au voisinage du compteur ou fixe sur celui-ci.installs near or fixed to the meter.
1 28405011 2840501
La presente invention est relative a des perfectionnements apportes aux inducteurs de chauffage, The present invention relates to improvements made to heating inductors,
notamment de produits metalliques en bandes. in particular of metal products in strips.
Lors du chauffage par induction d'une bande metallique a l' aide d'un inducteur a flux magnetique longitudinal, on observe une surchauffe des rives de la bande par rapport a sa partie centrale. Cette surchauffe est d'autant plus importante que la frequence du courant d'alimentation de l'inducteur est elevee. Or, cette augmentation de frequence constitue a l'heure actuelle une evolution importante de la technologie dans ce domaine technique particulier etant donne quielle permet de realiser des installations de During the induction heating of a metal strip using an inductor with longitudinal magnetic flux, the edges of the strip are overheated with respect to its central part. This overheating is all the more important as the frequency of the supply current of the inductor is high. However, this increase in frequency constitutes at the present time an important evolution of technology in this particular technical field given that it makes it possible to carry out installations of
chauffage de grande compacite.very compact heating.
Afin de resoudre ce probleme de surchauffe des rives de la bande, l'Homme de l'art dispose a l'heure actuelle notamment des deux solutions qui vent representees de facon schematique sur les figures 1 et 2 des dessins annexes, ces figures etant des vues en coupe verticale des inducteurs de chauffage. Dans la solution selon la figure 1, on ameliore la forme des spires de l'inducteur 3 de maniere a adapter la In order to resolve 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 accompanying drawings, these figures being vertical section views of the heating inductors. In the solution according to FIG. 1, the shape of the turns of the inductor 3 is improved so as to adapt the
valeur du champ magnetique sur les rives 2 de la bande 1. value of the magnetic field on the edges 2 of the strip 1.
Dans la solution ainsi illustree, l'inducteur presente une forme cite en << os de chien >> de facon a appliquer un champ magnetique plus faible sur les rives 2 de la bande qu'au centre de cette derriere. L' inconvenient de cette solution connue reside en ce qu'elle ne peut generer un chauffage parfait que pour une largeur determinee de la bande In the solution thus illustrated, the inductor presents a form cited 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 strip.
metallique 1 a chauffer.metallic 1 to be heated.
La solution illustree par la figure 2 consiste a devier le champ magnetique en mettant en uvre des barreaux tels que 5, a haute permeabilite, ces barreaux, eventuellement mobiles, etant positionnes le long des rives The solution illustrated in FIG. 2 consists in deflecting the magnetic field by using bars such as 5, at high permeability, these bars, possibly mobile, being positioned along the banks.
2 28405012 2840501
2 de la bande 1. Dans cette solution connue, on retrouve le meme inconvenient que dans la solution decrite ci-dessus en reference a la figure 1: la correction n'est parfaite que pour une largeur determinee de bande, ce qui entralne la necessite de rendre mobile les barreaux magnetiques 5, en fonction de la largeur de la bande a chauffer. Cette solution n'est done pas pratique a mettre en muvre sur le 2 of strip 1. In this known solution, we find the same drawback as in the solution described above with reference to FIG. 1: the correction is only perfect for a determined width of strip, which entails 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 the
plan industrial.industrial plan.
Le present titulaire a egalement apporte une solution au probleme mentionne ci-dessus et qui a fait ['objet de la The present holder also brought a solution to the problem mentioned above and which was the subject of the
demande de brevet n 02 04218 deposee le 4 avril 2002. Patent application no. 02 04218 filed on April 4, 2002.
Selon cette solution, l'inducteur du dispositif de chauffage, comporte entre ses spires, deux deflecteurs de champ magnetique dont la forme et la disposition vent choisies de facon qu'ils masquent les spires de l'inducteur According to this solution, the inductor of the heating device, comprises between its turns, two magnetic field deflectors whose shape and wind arrangement chosen so that they mask the turns of the inductor
au niveau des rives de la bande.at the edge of the strip.
La presente invention se propose d'apporter une autre solution a ce probleme de la surchauffe des rives des bandes chauffees par induction, cette solution pouvant toutefois etre mise en muvre en combinaison avec les solutions selon l'etat anterieur de la technique rappele ci-dessus. En consequence, l' invention a pour objet un systeme de chauffage par induction de produits metalliques, notamment des bandes, a flux magnetique longitudinal, caracterise en ce que les spires de l'inducteur presentent une forme concave de maniere a assurer une diminution du champ magnetique qui est applique sur les rives de la bande en deplacement continu, par rapport au champ qui est applique The present invention proposes to provide another solution to this problem of the overheating of the edges of the bands heated by induction, this solution being able however to be implemented in combination with the solutions according to the prior state of the technique recalled above. . 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 turns of the inductor have a concave shape so as to ensure a reduction in the field magnetic which is applied on the edges of the strip in continuous displacement, compared to the field which is applied
dans la partie centrale de ladite bande. in the central part of said strip.
D'autres caracteristiques et avantages de la presente Other characteristics and advantages of this
invention ressortiront de la description faite ci-apres, en invention will emerge from the description given below, in
reference au dessin annexe dont la figure 3 est une vue schematique en elevation laterale d'un exemple de reference to the accompanying drawing, FIG. 3 is a schematic side elevation view of an example of
3 28405013 2840501
realisation non limitatif d'un systeme de chauffage a inducteur a flux longitudinal perfectionne selon nonlimiting realization of a heating system with inductor with improved longitudinal flow according to
l' invention.the invention.
En se referent a la figure 3, on a designe par la reference 6 l'alimentation de l'inducteur de chauffage a flux magnetique longitudinal entre les spires 7, 7' duquel circule en continu, selon la fleche F. la bande 1 a chauffer. Selon l' invention et ainsi qu'on le volt clairement sur la figure 3, les spires inductrices 7, 7' presentent une forme concave qui est choisie de maniere a obtenir une diminution du champ magnetique applique sur les rives 2 de la bande 1, par rapport au champ magnetique qui est Referring to Figure 3, there is designated by the reference 6 the power of the heating inductor with longitudinal magnetic flux between the turns 7, 7 'of which circulates continuously, according to the arrow F. the strip 1 to be heated . According to the invention and as shown clearly in FIG. 3, the inducing turns 7, 7 ′ have a concave shape which is chosen so as to obtain a reduction in the magnetic field applied to the edges 2 of the strip 1, with respect to the magnetic field which is
applique dans la partie centrale de ladite bande. applied in the central part of said strip.
Cette diminution du champ magnetique provoque a son tour une diminution de la densite de puissance qui est injectee dans la bande 1 et cette diminution de la densite de puissance est proportionnelle au carre de la diminution du champ magnetique applique. Le temps de sejour entre les spires de la bande a chauffer etant proportionnel a la longueur de l'inducteur, on obtient en sortie une difference de puissance injectee, ce qui se traduit par des temperatures proportionnelles au changement de longueur de l'inducteur entre le centre de la bande (longueur L1) et les rives 2 de cette derriere (longueur L2). I1 suffit done d' adapter la concavite des spires de l'inducteur a la surchauffe qui est observee sur les rives de la bande pour This decrease in the magnetic field in turn causes a decrease in the power density which is injected into the band 1 and this decrease in the power density is proportional to the square of the decrease in the applied magnetic field. The residence time between the turns of the strip to be heated being proportional to the length of the inductor, a difference in injected power is obtained at the output, which results in temperatures proportional to the change in length of the inductor between the center of the strip (length L1) and the edges 2 of this behind (length L2). It is therefore sufficient to adapt the concavity of the turns of the inductor to the overheating which is observed on the edges of the strip for
obtenir un chauffage homogene de toute la bande. obtain uniform heating of the entire strip.
Le dispositif selon l' invention peut s'appliquer a toute forme d'inducteur a flux longitudinal comportant une The device according to the invention can be applied to any form of inductor with longitudinal flow comprising a
ou plusieurs spires.or more turns.
Ainsi qu'on l'a deja mentionne ci-dessus, il peut etre combine avec l'un quelconque des dispositifs de correction As already mentioned above, it can be combined with any of the correction devices
4 28405014 2840501
selon l'etat anterieur de la technique mentionne ci-dessus et notamment avec celui con,cu par la presente titulaire et decrit dans sa demande de brevet sus-mentionnee. Dans ce cas, le dispositif decrit ci-dessus est mis en uvre conjointement avec un systeme de correction comportant entre les spires de l'inducteur, deux deflecteurs de champ magnetique dont la forme et la disposition vent choisies de fa,con qu'ils masquent les spires de l'inducteur au niveau according to the prior art mentioned above and in particular with that con, cu by the present holder and described in its patent application mentioned above. In this case, the device described above is implemented in conjunction with a correction system comprising, between the turns of the inductor, two magnetic field deflectors, the shape and arrangement of the wind chosen in such a way that they conceal the inductor turns at the level
des rives (2) de la bande (l).edges (2) of the strip (l).
Parmi les avantages et effete techniques apportes par ['invention, on peut citer notamment le suivant: - la correction apportee au chauffage est constante queue que soit la largeur de la bande chauffee, ce qui permet une utilisation en production industrielle de la solution Among the technical advantages and effects provided by the invention, the following may be mentioned in particular: the correction made to the heating is constant, whatever the width of the heated strip, which allows use in industrial production of the solution
apportee par ['invention.provided by the invention.
Il demeure bien entendu que la presente invention n'est pas limitee aux exemples de realisation decrits et representes ci-dessus, mais qu'elle en englobe toutes les variantes. 284o5o1 It remains of course that the present invention is not limited to the examples of embodiment described and represented above, but that it encompasses all variants thereof. 284o5o1
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0206570A FR2840501B1 (en) | 2002-05-29 | 2002-05-29 | IMPROVEMENTS RELATING TO METAL STRIP HEATING INDUCERS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0206570A FR2840501B1 (en) | 2002-05-29 | 2002-05-29 | IMPROVEMENTS RELATING TO METAL STRIP HEATING INDUCERS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2840501A1 true FR2840501A1 (en) | 2003-12-05 |
| FR2840501B1 FR2840501B1 (en) | 2004-09-03 |
Family
ID=29558814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0206570A Expired - Fee Related FR2840501B1 (en) | 2002-05-29 | 2002-05-29 | IMPROVEMENTS RELATING TO METAL STRIP HEATING INDUCERS |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2840501B1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE903977C (en) * | 1940-01-21 | 1954-02-11 | Siemens Ag | Eddy current heater |
| WO2002019773A1 (en) * | 2000-08-29 | 2002-03-07 | Otto Junker Gmbh | Device for inductively heating metallic strips |
-
2002
- 2002-05-29 FR FR0206570A patent/FR2840501B1/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE903977C (en) * | 1940-01-21 | 1954-02-11 | Siemens Ag | Eddy current heater |
| WO2002019773A1 (en) * | 2000-08-29 | 2002-03-07 | Otto Junker Gmbh | Device for inductively heating metallic strips |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2840501B1 (en) | 2004-09-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |
Effective date: 20090119 |