EP2027754B2 - Hochfrequenzinduktionsheizgerät und mit einer solchen vorrichtung ausgerüsteter induktionsherd - Google Patents

Hochfrequenzinduktionsheizgerät und mit einer solchen vorrichtung ausgerüsteter induktionsherd Download PDF

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Publication number
EP2027754B2
EP2027754B2 EP07788840.2A EP07788840A EP2027754B2 EP 2027754 B2 EP2027754 B2 EP 2027754B2 EP 07788840 A EP07788840 A EP 07788840A EP 2027754 B2 EP2027754 B2 EP 2027754B2
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Prior art keywords
capacitors
capacitor
inductor
voltage
battery
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EP07788840.2A
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English (en)
French (fr)
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EP2027754A1 (de
EP2027754B1 (de
Inventor
Philippe Roehr
Ivan Novikoff
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Fives Celes
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Fives Celes
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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
    • H05B6/101—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

Definitions

  • high frequency used for the alternating current is meant a frequency equal to or greater than 10 kilohertz (kHz).
  • the current I is important, of the order of a few thousand amperes to several tens of thousands of amperes.
  • the inductance L because of the geometrical size of the inductor 3, often connected to that of the armature 4 that it surrounds, can not fall below a minimum value of the order of a few tenths of a microhenry for band heating inductors, even by constructing inductors called "monospires", that is to say, a single turn.
  • ⁇ reaches high values to allow heating of thin strips 4 and avoid a drop in system efficiency.
  • the voltage across the inductor L ⁇ I is therefore equal to 3 I / C ⁇ , while the voltage across the compensation capacitor 2, which corresponds to the supply voltage, is equal to I / C ⁇ .
  • the voltage across the inductor is multiplied by three.
  • connection connections must be "compensated", that is to say have a minimum connection inductance. This reduction in the inductance of the connections can only be obtained by bringing the supply conductors of the inductor and the internal conductors of the capacitor bank as close as possible. As illustrated schematically on Fig.2 , the distance e between the connection connections must be minimal to limit the parasitic inductance of the connection.
  • capacitor bank often consisting of elementary capacitors with low resistance in unit voltage, connected in series-parallel.
  • the object of the invention is, above all, to provide an induction heating device which makes it possible to transfer high power through the inductor while reducing the construction difficulties created by the voltages, in particular at the level of the inductor connections. and capacitors.
  • an inductive heating device of the kind defined above is characterized in that the inductor consists of at least two distinct inductive elements connected together in series by at least one capacitor, the voltage which appears between the connection points of the elementary inductive parts being reduced with respect to the voltage necessary for the operation of the inductor, for a desired heating power.
  • the device may comprise a capacitor connected between the terminals of the power supply and three distinct inductive elements, having or not even elementary inductance, interconnected in series by two connecting capacitors.
  • the device may comprise a capacitor connected between the terminals of the power supply and two distinct inductive elements, interconnected in series by a connecting capacitor.
  • the device comprises a capacitor connected between the terminals of the power supply and N distinct inductive elements, interconnected in series by N-1 connecting capacitors.
  • connection capacitor or capacitors have capacitance values equal to each other, and equal to the capacitance of the capacitor connected to the terminals of the supply.
  • the capacitors, or capacitor banks have capacitance values different from those of the capacitor, or of the capacitor bank, connected to the terminals of the high frequency power supply, to obtain elevation ratios. non-integer voltage.
  • connection capacitor (s) are located in a zone opposite to the supply with respect to the armature.
  • the or each connecting capacitor may consist of a capacitor bank.
  • the invention also relates to an induction heating furnace.
  • a heating furnace for metal strips is characterized in that it comprises an induction heating device, with one or more turns, as defined above.
  • the capacitors, or capacitor banks, of connection can be placed inside the furnace envelope, in the atmosphere of the furnace.
  • induction heating is the melting of glass or oxide in a direct coil.
  • an inductive heating device H which comprises a frequency converter 1 constituting the high frequency power supply equal to or greater than 10 kHz.
  • a capacitor, or a capacitor bank, of compensation 2 is connected between the terminals of the power supply 1.
  • the inductor connected to the terminals of the capacitor 2 and the power supply, consists of at least two distinct inductive elements.
  • the inductor consists of three elementary inductive parts 3a, 3b, 3c interconnected in series by at least one capacitor, or capacitor bank, 2a, 2b.
  • the inductance equivalent to that of the elementary inductive parts 3a, 3b, 3c, in series is equal to the determined value L of the inductor 3 of a conventional assembly according to Fig.1 to 3 .
  • the voltage U1 develops between the terminals 6a and 7c of the respective elementary inductive parts 3a and 3c; the voltage U2 between the terminals 7a and 6b of the elementary inductive parts 3a and 3b and the voltage U3 between the terminals 7b and 6c of the elementary inductive parts 3b, 3c.
  • the capacitor 2 is connected to the terminals 6a, 7c whereas the capacitors 2a, 2b are respectively connected to the terminals 7a, 6b and to the terminals 7b, 6c.
  • the inductor formed by all of the elementary inductive parts 3a, 3b, 3c can be installed inside an enclosure 8 of a heating furnace, for example under a protective atmosphere, in particular H2 + N2, to keep separate from the presence of air or oxygen to avoid the risk of explosion.
  • the envelope 8 is waterproof, and made for example of sheet steel.
  • the capacitors 2a, 2b can be housed inside the envelope 8 because induction heating does not cause excessive temperatures in the interior volume of the envelope 8.
  • a single watertight passage 9 is to make, through the wall of the casing 8, for the passage of end branches 10a, 10c of the inductors 3a, 3c in order to make the connection terminals 6a, 7c accessible from the outside of the casing 8.
  • the realization of a tight passage 9 being relatively expensive, it is particularly interesting to be able to avoid such a sealed crossing at the terminals 7a, 6b and / or 7b, 6c.
  • Fig.5 is a circuit diagram equivalent to the installation of Fig.4 .
  • the same numerical references have been taken from the diagram of Fig.5 showing that inductor, of inductance L, is divided into several parts, three in the example in question, connected by capacitors 2a, 2b, 2.
  • Fig.6 is a diagram of another embodiment for a series oscillating circuit in which the inductor is divided into two parts 3a, 3b connected by a capacitor 2a.
  • the other end terminals of the elementary inductive parts 3a, 3b are respectively connected to a plate of a capacitor 2 or 2b, itself connected by its other plate to a terminal of the power supply.
  • This assembly can be provided with or without a transformer 11.
  • This concept can easily be generalized to a number of connection points different from those illustrated by the examples of Fig.4 to 6 and / or with inductors with two turns or more than two turns.
  • Fig.7 is a simplified diagram in perspective illustrating the case of a monospiral inductor 3 for metal strip 4 which scrolls vertically according to the representation of Fig.7 .
  • Fig.8 illustrates another example of application of induction heating in the case of a glass melting furnace or oxides, in direct turn.
  • a high-frequency power supply constituted by a frequency converter 21, with a capacitor, or a capacitor bank, 22 of compensation connected between the terminals of the converter.
  • An inductor 23, for example single-core, connected to the terminals of capacitor 22 surrounds a mass of molten glass G, which is electrically conductive.
  • the currents induced in the mass G of glass are schematically represented by a dotted line 25.
  • the inductor is divided into two elementary inductive parts 23a, 23b, represented here symmetrically and the equivalent inductance of the two inductors 23a, 23b is equal to that of the inductor 23 of Fig.8 .
  • the ends of the elementary inductors 23a, 23b opposite to the power supply are connected to a capacitor 22a connected to the respective terminals 27a, 27b of the elementary inductors.
  • the voltage at the terminals of each elementary inductive part is U2 ⁇ I (apart from the ohmic resistance).
  • the transferred power equal to the sum of the powers transferred by each elementary inductive part, is the same as for Fig.8 .
  • the voltage across the capacitor 22 and between the points 26a, 26b is equal to 1 / 2C ⁇ , which is half of what it is on Fig.8 for the same power transferred in the armature to be heated.
  • Fig.9 The example of Fig.9 is not limiting, and the inductor could be decomposed into more than two elementary inductive parts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Furnace Details (AREA)

Claims (12)

  1. Induktionsheizvorrichtung, bestehend aus:
    - einer einzigen Hochfrequenz-Stromquelle;
    - einem Induktor (3, 23, der in der Lage ist, ein zu heizendes Induktionselement (2, G) zumindest teilweise zu umschließen, wobei der Induktor eine Induktanz (L) von vorbestimmter Größe für eine gewünschte Heizleistung aufweist,
    - einer kapazitiven Verbindungsschaltung zwischen der Stromquelle und dem Induktor, welche zum Erhöhen der Spannung an den Anschlüssen des Induktors in Bezug auf die von der Stromquelle gelieferte Spannung vorgesehen ist,
    wobei der Induktor aus mindestens zwei separaten elementaren induktiven Teilen (3a, 3b, 3c; 23a, 23b) gebildet ist, die miteinander durch mindestens einen Kondensator oder eine Kondensatorbatterie (2, 2a, 2b; 22, 22a) in Reihe verbunden sind, wobei die zwischen den Anschlussstellen der elementaren induktiven Teile auftretende Spannung in Bezug auf die für den Betrieb des Induktors zum Erreichen einer gewünschten Heizleistung erforderliche Spannung geringer ist.
  2. Vorrichtung nach Anspruch 1, wobei sie einen Kondensator oder eine Kondensatorbatterie (2) aufweist, welche zwischen den Anschlüssen der Stromquelle und drei separaten elementaren induktiven Teilen (3a, 3b, 3c) geschaltet ist, welche miteinander durch zwei Verbindungskondensatoren oder Kondensatorbatterien (2a, 2b) in Reihe verbunden sind.
  3. Vorrichtung nach Anspruch 1, wobei sie einen Kondensator oder eine Kondensatorbatterie (22a) aufweist, welche zwischen den Anschlüssen der Stromquelle und zwei separaten elementaren induktiven Teilen (23a, 23b) geschaltet ist, welche miteinander durch einen Kondensator oder eine Verbindungskondensatorbatterie (22b) in Reihe verbunden sind.
  4. Vorrichtung nach Anspruch 1, wobei sie einen Kondensator oder eine Kondensatorbatterie aufweist, welche zwischen den Anschlüssen der Stromquelle und N separaten elementaren induktiven Teilen geschaltet ist, welche miteinander durch N-1 Kondensatoren oder Verbindungskondensatorbatterien in Reihe verbunden sind.
  5. Vorrichtung nach einem der Ansprüche 2 bis 4, wobei der oder die Verbindungskondensatoren (2a, 2b; 22a) Kapazitätswerte aufweisen, die untereinander gleich sind und gleich der Kapazität eines an die Anschlüsse der Stromquelle angeschlossenen Kondensators (2, 22) sind.
  6. Vorrichtung nach einem der Ansprüche 2 bis 4, wobei die Verbindungskondensatoren oder -kondensatorbatterien Kapazitätswerte aufweisen, welche von demjenigen des Kondensators oder der Kondensatorbatterie verschieden ist, welche an die Anschlüsse der Hochfrequenzstromquelle angeschlossen ist, um nicht-ganzzahlige Verhältnisse der Spannungserhöhung zu erhalten.
  7. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei der oder die Verbindungskondensatoren (2a, 2b; 22) in einer in Bezug auf das Induktionselement (4, G) zur Stromversorgung entgegengesetzten Zone angeordnet sind.
  8. Heizvorrichtung nach einem der vorhergehenden Ansprüche, wobei die Kondensatoren oder die Kondensatorbatterien über den Umfang des Induktionselements (4, G) verteilt angeordnet sind, um die Raumbelegung nahe dem Induktionselement zu optimieren und so parasitäre Induktionen zu begrenzen.
  9. Heizvorrichtung nach einem der vorhergehenden Ansprüche, wobei der oder jeder Verbindungskondensator durch eine Kondensatorbatterie gebildet ist.
  10. Heizofen für Metallbänder (4), wobei er eine mit einer oder mehreren Windungen versehene Induktionsheizvorrichtung nach einem der vorhergehenden Ansprüche aufweist.
  11. Heizofen nach Anspruch 10, wobei die Verbindungskondensatoren oder - kondensatorbatterien (2a, 2b) im Inneren des Ofenmantels (8) in der Atmosphäre des Ofens angeordnet sind.
  12. Glas-Schmelzofen (G) oder Sauerstoff-Schmelzofen mit direkter Windung, wobei er eine Induktfonsheizvorrichtung nach einem der Ansprüche 1 bis 9 aufweist.
EP07788840.2A 2006-06-09 2007-06-06 Hochfrequenzinduktionsheizgerät und mit einer solchen vorrichtung ausgerüsteter induktionsherd Active EP2027754B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0605134A FR2902274B1 (fr) 2006-06-09 2006-06-09 Dispositif de chauffage par induction a haute frequence, et four a induction equipe d'un tel dispositif
PCT/FR2007/000932 WO2007141422A1 (fr) 2006-06-09 2007-06-06 Dispositif de chauffage par induction a haute frequence, et four a induction equipe d'un tel dispositif

Publications (3)

Publication Number Publication Date
EP2027754A1 EP2027754A1 (de) 2009-02-25
EP2027754B1 EP2027754B1 (de) 2009-12-09
EP2027754B2 true EP2027754B2 (de) 2014-06-25

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EP07788840.2A Active EP2027754B2 (de) 2006-06-09 2007-06-06 Hochfrequenzinduktionsheizgerät und mit einer solchen vorrichtung ausgerüsteter induktionsherd

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EP (1) EP2027754B2 (de)
AT (1) ATE451816T1 (de)
DE (1) DE602007003719D1 (de)
ES (1) ES2338182T5 (de)
FR (1) FR2902274B1 (de)
WO (1) WO2007141422A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2944942B1 (fr) * 2009-04-23 2011-07-22 Fives Celes Dispositif de chauffage par inducteur de puissance, inducteur de puissance, et four ainsi equipe
KR101404386B1 (ko) 2010-01-06 2014-06-09 신닛테츠스미킨 카부시키카이샤 유도 가열 코일, 가공 부재의 제조 장치 및 제조 방법
FR3130109B1 (fr) * 2021-12-07 2024-02-16 Fives Celes Element d’un equipement de chauffage par induction apte a recevoir un fluide de refroidissement

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5495094A (en) 1994-04-08 1996-02-27 Inductotherm Corp. Continuous strip material induction heating coil
US5837976A (en) * 1997-09-11 1998-11-17 Inductotherm Corp. Strip heating coil apparatus with series power supplies
US6163019A (en) 1999-03-05 2000-12-19 Abb Metallurgy Resonant frequency induction furnace system using capacitive voltage division
FR2852187A1 (fr) * 2003-03-07 2004-09-10 Celes Dispositif de chauffage par induction d'une bande metallique
US6963056B1 (en) * 2003-05-09 2005-11-08 Inductotherm Corp. Induction heating of a workpiece

Also Published As

Publication number Publication date
ATE451816T1 (de) 2009-12-15
ES2338182T5 (es) 2014-09-22
EP2027754A1 (de) 2009-02-25
ES2338182T3 (es) 2010-05-04
WO2007141422A1 (fr) 2007-12-13
DE602007003719D1 (de) 2010-01-21
FR2902274A1 (fr) 2007-12-14
EP2027754B1 (de) 2009-12-09
FR2902274B1 (fr) 2008-08-08

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