EP2027754A1 - High frequency induction heating device, and induction oven equipped with such device - Google Patents
High frequency induction heating device, and induction oven equipped with such deviceInfo
- Publication number
- EP2027754A1 EP2027754A1 EP07788840A EP07788840A EP2027754A1 EP 2027754 A1 EP2027754 A1 EP 2027754A1 EP 07788840 A EP07788840 A EP 07788840A EP 07788840 A EP07788840 A EP 07788840A EP 2027754 A1 EP2027754 A1 EP 2027754A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- capacitor
- inductor
- capacitors
- voltage
- terminals
- 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 36
- 230000006698 induction Effects 0.000 title claims abstract description 21
- 230000001939 inductive effect Effects 0.000 claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims description 93
- 239000011521 glass Substances 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 230000003071 parasitic effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 12
- 239000004020 conductor Substances 0.000 description 5
- 230000010349 pulsation Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000004065 semiconductor Substances 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
Definitions
- the invention relates to an induction heating device of the kind comprising:
- an inductor adapted to surround, at least partially, an inductive element to be heated, the inductor having a determined inductance for a desired heating power, and a capacitive connection between the power supply and the inductor provided for increase the voltage across the inductor with respect to the voltage supplied by the power supply.
- high frequency used for the alternating current is meant a frequency equal to or greater than 10 kilohertz (kHz).
- kHz kilohertz
- a high frequency AC power supply 1 consists of a frequency converter.
- One or more compensation capacitors 2 are connected to the terminals of the converter.
- the inductor 3 surrounds a metal strip 4 to be heated; the length of the strip 4 is perpendicular to the plane of FIG.
- Intensity currents of intensity I surround the band 4 so as to create induced currents whose circulation is schematically represented by a dotted line.
- the frequency converter 1 provides the active power needed to heat the metal strip 4.
- the capacitor, or the capacitor bank, 2 provides the power reactive necessary to the magnetization of the space in which the magnetic field created by the inductor 3 develops.
- two link capacitors 2 'in series, combined with the capacitor 2 are provided for increasing the voltage across the inductor.
- L is equal to the inductance of inductor 3 (expressed in henry), ⁇ is the pulsation of the alternating current of the supply current
- the power Pt transferred by induction to the band 4 is proportional:
- n the number of turns of the inductor 3 or primary circuit
- 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.
- 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
- 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.
- 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 points of connection 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 capacitors or capacitor banks can be distributed over the perimeter of the armature in order to optimize the occupation of the space in the vicinity of 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.
- Fig.1 is a diagram of an induction heating device according to the state of the art.
- Fig.2 is a diagram similar to Fig.1, with a monospiral inductor shown in perspective, according to the state of the art.
- FIG. 3 is a diagram of a circuit with a battery of voltage multiplying capacitors, according to the state of the art.
- Fig.4 is a diagram of a heating device according to the invention.
- Fig.5 is an equivalent diagram of the device of Fig.4.
- FIG. 6 is a variant of the scheme of Fig.5.
- FIG. 7 is a perspective diagram illustrating the displacement of a strip to be heated in a single-phase inductor equipped with a connection capacitor.
- Fig.8 is a diagram of a single-turn glass melting furnace according to the state of the art
- Fig.9 is a schematic diagram of a monospire glass melting furnace according to the invention.
- an inductive heating device H which comprises a frequency converter 1 constituting the high frequency power supply equal to or greater than 10 kHz.
- 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. inductance equivalent to those 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 FIGS.
- 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 may be installed inside an enclosure 8 of a heating furnace located by example in a protective atmosphere, especially 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 an electrical diagram equivalent to the installation of Fig.4.
- the same numerical references have been reproduced in the diagram of FIG. 5 showing that the inductor, of inductance L, is divided into several parts, three in the example in question, connected by capacitors 2a, 2b, 2.
- .6 is a diagram of another exemplary 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 perspective diagram illustrating the case of a monospiral inductor 3 for metal strip 4 which scrolls vertically according to the representation of FIG.
- Fig.8 illustrates another example of application of induction heating in the case of a glass melting furnace or oxides, in direct turn.
- an induction glass melting furnace there is 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 weak point of induction furnaces melting glass or refractory oxides is located in a zone A closing the turn and connection to the power supply.
- This zone A is subject to electrical ignition between the conductors because of the large potential difference between the supply terminals 26a, 26b of the inductor.
- 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 between the points 26a, 26b, according to Fig.9, is halved, while the transferred heating power is retained.
- the inductor 23 having an inductance L, and the capacitor 2 having a capacitance C, the pulsation of the current being ⁇ , the relation LC ⁇ 2 1 is satisfied for the resonance.
- the voltage across each elementary inductive part is L / 2 ⁇ I
- 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 at the terminals of the capacitor 22 and between the points 26a, 26b is equal to 1 / 2C ⁇ , which is half of what it is in FIG. 8 for the same power transferred in the armature to be heated.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
- Furnace Details (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0605134A FR2902274B1 (en) | 2006-06-09 | 2006-06-09 | HIGH FREQUENCY INDUCTION HEATING DEVICE, AND INDUCTION FURNACE EQUIPPED WITH SUCH A DEVICE |
PCT/FR2007/000932 WO2007141422A1 (en) | 2006-06-09 | 2007-06-06 | High frequency induction heating device, and induction oven equipped with such device |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2027754A1 true EP2027754A1 (en) | 2009-02-25 |
EP2027754B1 EP2027754B1 (en) | 2009-12-09 |
EP2027754B2 EP2027754B2 (en) | 2014-06-25 |
Family
ID=37487530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07788840.2A Active EP2027754B2 (en) | 2006-06-09 | 2007-06-06 | High frequency induction heating device, and induction oven equipped with such device |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2027754B2 (en) |
AT (1) | ATE451816T1 (en) |
DE (1) | DE602007003719D1 (en) |
ES (1) | ES2338182T5 (en) |
FR (1) | FR2902274B1 (en) |
WO (1) | WO2007141422A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2944942B1 (en) * | 2009-04-23 | 2011-07-22 | Fives Celes | POWER INDUCER HEATING DEVICE, POWER INDUCER, AND OVEN EQUIPPED THEREFOR |
WO2011083817A1 (en) * | 2010-01-06 | 2011-07-14 | 住友金属工業株式会社 | Induction heating coil, device for manufacturing of workpiece, and manufacturing method |
FR3130109B1 (en) * | 2021-12-07 | 2024-02-16 | Fives Celes | ELEMENT OF INDUCTION HEATING EQUIPMENT CAPABLE OF RECEIVING A COOLING FLUID |
Citations (3)
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 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2852187A1 (en) * | 2003-03-07 | 2004-09-10 | Celes | Heating device for drying paint layer, has coil surrounding metallic band zone transversally to longitudinal direction of band, including single concave loops whose average plan is orthogonal to longitudinal direction of band |
US6963056B1 (en) * | 2003-05-09 | 2005-11-08 | Inductotherm Corp. | Induction heating of a workpiece |
-
2006
- 2006-06-09 FR FR0605134A patent/FR2902274B1/en not_active Expired - Fee Related
-
2007
- 2007-06-06 AT AT07788840T patent/ATE451816T1/en not_active IP Right Cessation
- 2007-06-06 EP EP07788840.2A patent/EP2027754B2/en active Active
- 2007-06-06 WO PCT/FR2007/000932 patent/WO2007141422A1/en active Application Filing
- 2007-06-06 ES ES07788840.2T patent/ES2338182T5/en active Active
- 2007-06-06 DE DE602007003719T patent/DE602007003719D1/en active Active
Patent Citations (3)
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 |
Also Published As
Publication number | Publication date |
---|---|
FR2902274B1 (en) | 2008-08-08 |
EP2027754B2 (en) | 2014-06-25 |
DE602007003719D1 (en) | 2010-01-21 |
ES2338182T5 (en) | 2014-09-22 |
ES2338182T3 (en) | 2010-05-04 |
ATE451816T1 (en) | 2009-12-15 |
EP2027754B1 (en) | 2009-12-09 |
WO2007141422A1 (en) | 2007-12-13 |
FR2902274A1 (en) | 2007-12-14 |
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