WO2009125645A1 - 誘導加熱装置及び誘導加熱方法 - Google Patents
誘導加熱装置及び誘導加熱方法 Download PDFInfo
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- WO2009125645A1 WO2009125645A1 PCT/JP2009/054734 JP2009054734W WO2009125645A1 WO 2009125645 A1 WO2009125645 A1 WO 2009125645A1 JP 2009054734 W JP2009054734 W JP 2009054734W WO 2009125645 A1 WO2009125645 A1 WO 2009125645A1
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- heating
- inductance
- induction
- heating coils
- adjusters
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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
- H05B6/36—Coil arrangements
- H05B6/362—Coil arrangements with flat coil conductors
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/60—Continuous furnaces for strip or wire with induction heating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Definitions
- the present invention relates to an induction heating apparatus and an induction heating method.
- the steel sheets are heated in various places such as annealing furnaces, plating alloying furnaces, and drying of coated steel sheets.
- the method for heating the steel sheet include gas heating and transformer induction heating.
- gas heating is often used for annealing furnaces, and transformer induction heating can be used for heating before plating, but is mainly used for plating alloying furnaces, drying of coated steel sheets, and the like.
- the induction heating method is roughly classified into a solenoid method (axial magnetic flux heating) and a transverse method (transverse magnetic flux heating).
- a solenoid method axial magnetic flux heating
- transverse magnetic flux heating a magnetic flux along the longitudinal direction of the steel plate is applied to the steel plate and heated.
- the transverse induction heating method is usually used for heating a non-magnetic material, and a solenoid induction heating method is mainly used for heating a steel plate.
- Patent Documents 1 and 2 have been conventionally known.
- Patent Document 1 In the induction heating method of Patent Document 1, a high-frequency voltage cannot be applied for the above reason, and the amount of current needs to be increased. It is difficult to design the entire apparatus so that a large current can flow. For example, it is difficult to heat a steel plate to a high temperature range.
- the induction heating method of Patent Document 2 two or more single turn coils are installed along the longitudinal direction of the steel plate, and the magnetizing force of the last stage heating coil is 1 to 10 times that of the front stage.
- the induction heating method of Patent Document 2 it is possible to heat a steel sheet to a high temperature region near the Curie point and reduce a decrease in temperature increase rate near the Curie point.
- a decrease in the heating rate makes the recrystallization behavior, interface control, etc. ambiguous and makes it difficult to build optimum quality.
- the reduction in speed is reduced.
- the induction heating method of Patent Document 2 controls the magnetizing force of each heating coil by inserting a variable resistance between each heating coil and a power source and changing the variable resistance value.
- the heating furnace for alloying heating has a long overall length of, for example, about 5 to 10 m.
- the heating furnace near the Curie point is used. Even if it is not in a high temperature range, it has been difficult to keep the rate of temperature rise from the plating bath temperature to the final heating temperature. In order to strictly control the alloy structure, it is important to keep the temperature rising rate constant. Therefore, an induction heating method capable of keeping the temperature rising rate constant is also desired.
- an object of the present invention is to provide a solenoid-type induction heating apparatus and induction heating method, in which the temperature of the steel plate is increased while improving energy efficiency. It is to reduce the change in temperature rate.
- an induction heating device that continuously heats a steel plate by a solenoid method, so that the steel plate passes through the inside thereof in the longitudinal direction of the steel plate. And at least three heating coils arranged along the electric path, and further arranged on an electric path that electrically connects each of the heating coils and a power source that applies a voltage to each of the heating coils.
- Each of the heating coils includes an inductance regulator that can generate and adjust a self-inductance in the self-induction, and each of the inductance regulators includes at least one of the inductance regulators adjacent to each other.
- An induction heating device is provided that is arranged such that mutual induction occurs therebetween. Note that the number of heating coils refers to the number of heating coils that are electrically branched in parallel from one power source.
- the heating density of the steel plates generated by the adjacent heating coils can be superimposed.
- the voltage applied to at least three heating coils can be adjusted.
- the effect of the inductance adjustment can be made synergistic by the mutual inductance between adjacent inductance adjusters.
- the self-inductance generated by the inductance adjusters of the foremost heating coil and the last heating coil in the longitudinal direction of the steel sheet is the heating coil arranged between the foremost heating coil and the last heating coil. It may be adjusted to be smaller than the self-inductance generated by the inductance adjuster.
- the mutual distance between adjacent heating coils is 1/10 or more and 1/3 or less of the inner distance in the height direction of the heating coils, and each inductance adjuster is detoured in a direction intersecting the electric path.
- the gap between adjacent inductance adjusters configured by forming a path may be 50 mm to 500 mm.
- each inductance adjuster generates self-induction by diverting the electrical path in which the inductance adjuster is arranged in a substantially coil shape, and is surrounded by the substantially coiled detour path of the detoured electrical path.
- the self-inductance in self-induction may be adjusted by changing the cross-sectional area of the region.
- Each of the electrical paths connecting each heating coil and the power source is composed of a pair of input / output terminals extending from each heating coil in a long shape, and the inductance adjuster is one of the pair of input / output terminals. And detouring the pair of input / output terminals so that they are separated from each other, and changing the distance between one and the other of the pair of input / output terminals in the detour path to cut off the region surrounded by the detour path The area may be changed.
- the gap between each heating coil and the inductance adjuster connected to the heating coil may be 500 mm to 2000 mm.
- each heating coil may be a single turn coil or a double turn coil.
- an induction heating method for continuously heating a steel plate by a solenoid system, wherein the steel plate passes through at least three heating coils.
- Inductance regulators that are arranged along the longitudinal direction of the steel plate to generate self-induction and that can adjust self-inductance in the self-induction are applied to each of the heating coils and each of the heating coils.
- the longitudinal direction of the steel plate is arranged with respect to each of the heating coils so that mutual induction occurs at least between the inductance adjusters adjacent to each other.
- Each of the inductance adjusters provided in the heating coil at the foremost stage and the heating coil at the last stage in the direction is generated.
- the self-inductance to be adjusted is adjusted to be smaller than the self-inductance generated by the inductance adjuster of the heating coil disposed between the foremost heating coil and the last heating coil.
- An induction heating method is provided.
- the mutual distance between adjacent heating coils is 1/10 or more and 1/3 or less of the inner distance in the height direction of the heating coils, and each inductance adjuster is detoured in a direction intersecting the electric path.
- the gap between adjacent inductance adjusters configured by forming a path may be 50 mm to 500 mm.
- each inductance adjuster causes self-induction by bypassing the electrical path in which the inductance adjuster is arranged in a substantially coil shape, and is surrounded by the substantially coiled bypass path of the bypassed electrical path.
- the self-inductance in self-induction may be adjusted by changing the cross-sectional area of the region.
- Each of the electrical paths connecting each heating coil and the power source is composed of a pair of input / output terminals extending from each heating coil in a long shape, and the inductance adjuster is one of the pair of input / output terminals. And detouring the pair of input / output terminals so that they are separated from each other, and changing the distance between one and the other of the pair of input / output terminals in the detour path to cut off the region surrounded by the detour path The area may be changed.
- the gap between each heating coil and the inductance adjuster connected to the heating coil may be 500 mm to 2000 mm.
- each heating coil may be a single turn coil or a double turn coil.
- FIG. 1 is a perspective view showing an induction heating apparatus according to the first embodiment of the present invention.
- FIG. 2 is a side view of the induction heating apparatus according to the embodiment as viewed from the sheet passing direction.
- FIG. 3 is a top view of the induction heating apparatus according to the embodiment as viewed from above.
- FIG. 4A is an explanatory diagram for explaining the heating density on the steel plate generated by the heating coil in the induction heating apparatus according to the embodiment, and shows the mutual distance between adjacent heating coils in the height direction of the heating coil. It is a figure which shows the case where it is set as 1/10 or more and 1/3 or less of inner distance W1.
- FIG. 1 is a perspective view showing an induction heating apparatus according to the first embodiment of the present invention.
- FIG. 2 is a side view of the induction heating apparatus according to the embodiment as viewed from the sheet passing direction.
- FIG. 3 is a top view of the induction heating apparatus according to the embodiment as viewed from above.
- FIG. 4A is an explanatory
- FIG. 4B is an explanatory diagram for explaining the heating density on the steel plate generated by the heating coil in the induction heating apparatus for comparison with the same embodiment, and the adjacent conductors of the coil are made constant and adjacent to each other. It is a figure which shows the case where the mutual distance of a heating coil is made into 1/3 excess of the distance of the inner side of the height direction of a heating coil.
- FIG. 5 is an explanatory diagram for explaining a method of adjusting the L adjuster in the induction heating apparatus according to the embodiment.
- FIG. 6 is a graph showing the amount of current flowing through the heating coil when the L regulator is adjusted in the induction heating apparatus according to the embodiment.
- FIG. 7A is an explanatory diagram for schematically explaining a temperature increase rate in the longitudinal direction of the steel sheet by the induction heating apparatus according to the embodiment.
- FIG. 7B is a graph showing the rate of temperature increase in the longitudinal direction of the steel sheet by the induction heating apparatus according to the embodiment.
- FIG. 8 is a graph showing the rate of temperature rise when both ends are fully open.
- FIG. 9 is a graph showing the rate of temperature increase at the center fully open.
- FIG. 10 is a graph showing the current ratio of the heating coil to the area ratio of the L regulator.
- FIG. 11 is a graph showing the AC voltage with respect to the frequency of the AC voltage of the AC power supply in the induction heating apparatus according to the embodiment.
- FIG. 1 is a perspective view showing an induction heating device according to the first embodiment of the present invention
- FIG. 2 is a side view of the induction heating device according to this embodiment as viewed from the sheet passing direction of the steel plate 3 is a top view of the induction heating device according to the present embodiment as viewed from above.
- the induction heating apparatus 1 includes heating coils 10A to 10D, an electric path 11, and L regulators 12A to 12D. Therefore, below, each of these structures is demonstrated first.
- the induction heating apparatus 1 heats the steel plate 2 that is passed in the plate passing direction J1 by a solenoid system.
- Solenoid system axial magnetic flux heating
- This is an induction heating method in which an eddy current is generated inside the heated body and the heated body is heated by Joule heat of the eddy current.
- the induction heating apparatus 1 has at least three or more heating coils arranged so as to surround the steel plate 2 as shown in FIGS. 1 and 2 in order to generate a magnetic flux in the longitudinal direction of the steel plate 1 described above. .
- the induction heating apparatus 1 has four heating coils 10A to 10D for convenience of explanation.
- the number of heating coils is not limited to four.
- the induction heating device 1 also has the number corresponding to the heating coils in other configurations.
- each of the heating coils 10A to 10D is formed so as to surround the steel plate 1 so that the steel plate 1 passes through the inside, and is arranged along the longitudinal direction (x-axis direction) of the steel plate 2.
- the heating coils 10A to 10D are arranged side by side so that the forming surfaces forming the coils are substantially parallel and the center points of the forming surfaces are positioned on substantially the same straight line.
- the heating efficiency can be improved.
- the mutual distance D1 between the adjacent heating coils 10A to 10D is 1/10 times or more and 1/3 times or less of the inner distance W1 in the height direction of the heating coils 10A to 10D.
- the mutual distance D1 between the adjacent heating coils 10A to 10D is set to 1/10 or more and 1/3 or less of the inner distance W1 in the height direction of the heating coils 10A to 10D.
- 10D can keep the heating rate of the steel plate 2 constant, and can increase the heating efficiency. Therefore, according to this configuration, the shortage of the heating amount due to the magnetic permeability of the steel plate 2 that decreases in the vicinity of the Curie point can be compensated for by the heating regions of the coils 10A to 10D that may approach each other.
- mutual inductance is generated between the heating coils 10A to 10D, and the influence of the mutual inductance can be made synergistic. That is, it is possible to increase the current flowing through the heating coils 10A and 10D (the first and last heating coils) arranged at the end. This is because, as a result of the heating coils 10A to 10D being brought close to each other, the inductance of the central heating coils 10B and 10C is increased, so that the inductance of the heating coils 10A and 10D at the end portions is relatively decreased.
- the heating rate in the heating coil 10A in the last stage (and the heating coil 10D in the foremost stage) can be made larger than the heating rate in the other heating coils 10B and 10C. Therefore, the heating rate of the steel plate 2 heated in the vicinity of the Curie point in the last stage can be increased.
- the mutual distance D1 between the adjacent heating coils 10A to 10D is less than 1/10 of the inner distance W1 in the height direction of the heating coil coils 10A to 10D, the adjacent heating when the high-frequency AC voltage is applied. There is a risk of discharge occurring between the coils 10A to 10D. Further, as will be described below, the voltage applied to the heating coils 10A to 10D can be adjusted for each coil by the following L adjusters 12A to 12D in addition to the potential difference caused by the coils themselves. A potential difference occurs in Therefore, discharge may occur due to the potential difference. Therefore, the mutual distance D1 between the adjacent heating coils 10A to 10D is preferably 1/10 or more of the inner distance W1 in the height direction of the heating coil coils 10A to 10D.
- the heating efficiency of the adjacent heating coils 10A to 10D is increased. It cannot be improved.
- the heating of the steel sheet 2 by making the mutual distance D1 between the adjacent heating coils 10A to 10D equal to or less than 1/3 of the inner distance W1 in the height direction of the heating coil will be schematically described. explain.
- FIG. 4 is an explanatory diagram for explaining the heating density on the steel sheet generated by the heating coils 10C and 10D in the induction heating apparatus according to the present embodiment.
- FIG. 4A shows the case of this embodiment, that is, the mutual distance D1 between the adjacent heating coils 10A to 10D is 1/10 or more of the inner distance W1 in the height direction of the heating coils 10A to 10D. / 3 or less is shown.
- FIG. 4B shows the mutual distance D1 between the adjacent heating coils 10A to 10D, with the width of the coil conducting wire being constant, and the inner distance in the height direction of the heating coils 10A to 10D. The case where 1/3 of W1 is exceeded is shown.
- the heating density (unit is “Q / m 2 ”, the same applies hereinafter) H1 generated by 10D and the heating density H2 generated by the heating coil 10C are substantially Gaussian in the longitudinal direction of the steel plate 2. Therefore, the heating density H1 and the heating density H2 indicate that the mutual distance D1 between the adjacent heating coils 10A to 10D is 1/10 or more and 1/3 or less of the inner distance W1 in the height direction of the heating coils 10A to 10D.
- the heating density T1 for actually heating the steel plate 2 can be kept high even between the heating coil 10D and the heating coil 10C, that is, the temperature rising rate can be kept constant.
- the mutual distance D1 of the adjacent heating coils 10A to 10D is set to be more than 1/3 of the inner distance W1 in the height direction of the heating coils 10A to 10D, it is naturally heated. Needless to say, the superposition of the densities H1 and H2 disappears, and a constant heating rate cannot be maintained.
- the heating coils 10A to 10D are single-turn coils as shown in FIG. 1 and the like, but the heating coils may be double-turned.
- An AC voltage is applied from the AC power supply 3 to the heating coils 10A to 10D.
- an electric path 11 is extended to each of the heating coils 10A to 10D, and an AC voltage from the AC power source 3 is applied to each of the electric paths 11.
- the electrical path 11 electrically connects the AC power source 3 and each of the heating coils 10A to 10D, applies an AC voltage from the AC power source 3 to each of the heating coils 10A to 10D, and It is an input / output conductor used to input and output current.
- the electrical path 11 is constituted by a pair of input / output terminals 111 and 112 extending in a long shape from both ends of the coil shape of the heating coils 10A to 10D.
- Each of the pair of input / output terminals 111 and 112 is formed integrally with the connected heating coils 10A to 10D. According to this configuration, compared with the case where both are formed separately, the electrical resistance at the connection portion between the heating coils 10A to 10D and the pair of input / output terminals 111 and 112 is reduced, the strength is increased, and Manufacturing can be facilitated. However, it goes without saying that the heating coils 10A to 10D and the pair of input / output terminals 111 and 112 can be formed separately.
- the heating coils 10A to 10D are formed of a wide plate, and the pair of input / output terminals 111 and 112 have the same width as the heating coils 10A to 10D.
- the pair of input / output terminals 111 and 112 is formed of a wide plate material, so that a large current can be flowed with increased current resistance strength.
- the pair of input / output terminals 111 and 112 is not necessarily configured of a plate material. There is no need to
- the pair of input / output terminals 111 and 112 extend substantially parallel to each other. Then, each of the pair of input / output terminals 111 and 112 (that is, the electrical paths 11) is substantially in the same direction (y) in the substantially same plane (in the xy plane) regardless of the connected heating coils 10A to 10D. It is preferable to extend in the axial direction. According to this configuration, the induction heating device 1 can be made compact (downsized), and the heating coils 10A to 10D can be formed in the same shape, so that the manufacture is easy.
- L adjuster L regulators 12A to 12D are inserted and arranged on the respective electric paths 11 between the heating coils 10A to 10D and the AC power source 3.
- the L adjusters 12A to 12D are examples of inductance adjusters that can adjust the reactance in the circuit by adjusting the self-inductance, and bypass the electric path 11 in a substantially coil shape. More specifically, as shown in FIG. 2, the L adjusters 12A to 12D bypass one input / output terminal 111 constituting the electric path 11 upward (in the z-axis positive direction) and the other input / output terminal.
- the one input / output terminal 111 and the other input / output terminal 112 are separated from each other at the position where the L adjusters 12A to 12D are disposed.
- the L adjusters 12A to 12D bypass each of the input / output terminals 111 and 112 of the electrical path 11 in a substantially U-shape.
- the L adjusters 12A to 12D form a region S surrounded by the detour paths 121 and 122 in which the input / output terminals 111 and 112 are detoured.
- the detour paths 121 and 122 of the input / output terminals 111 and 112 surrounding the region S form a substantially coil shape like a single turn coil. Since the L regulators 12A to 12D having such a configuration have a substantially coil shape, self-induction occurs when an alternating current flows from the alternating current power source 3 (when an alternating voltage is applied).
- the L adjuster 12A includes standing portions 111C, 111B, 112C, and 112B and connecting portions 111M and 112M.
- the standing portion 111C is formed by bending the input / output terminal 111 extending from the heating coil 10A upward in the vertical direction (z-axis direction), and the standing portion 111B is connected to the AC power source 3. It is formed by bending the input / output terminal 111 in the same manner. Therefore, the standing portion 111C and the standing portion 111B are erected substantially in parallel.
- the connection part 111M electrically connects between this standing part 111C and the standing part 111B.
- the standing portions 111C and 111B and the connecting portion 111M form a detour path 121.
- the standing portion 112C is formed by bending the input / output terminal 112 extending from the heating coil 10A downward in the vertical direction (z-axis direction), and the standing portion 112B is connected to the AC power source 3.
- the input / output terminal 111 to be formed is similarly bent. Therefore, the standing portion 112C and the standing portion 112B are erected substantially in parallel.
- the connection part 112M electrically connects between this standing part 112C and the standing part 112B.
- the standing portions 112C and 112B and the connecting portion 112M form a detour path 122. That is, the space between the detour path 121 and the detour path 121 forms a region S. By forming this region S, the L adjusters 12A to 12D form a substantially coil shape, and the self-guided self Generate inductance.
- Each of the L adjusters 12A to 12D is configured to be able to adjust its own self-inductance. Specifically, the L adjusters 12A to 12D change the cross-sectional area (projected area in the yz plane) of the region S surrounded by the detour paths 121 and 122, that is, the area of the surface that forms a substantially coil shape. By doing so, the self-inductance can be adjusted.
- the self-inductance of the coil is determined by, for example, the number of turns, the coil radius, the coil length, the diameter of the conductive wire, the surrounding magnetic permeability (the magnetic permeability of the core, that is, the steel plate 2), etc.
- the inductance of the coil can be adjusted by changing the coil radius or the like. Therefore, the L adjusters 12A to 12D can adjust the self-inductance by changing the cross-sectional area of the region S. Therefore, the reactance in the circuit can be adjusted by the L adjusters 12A to 12D, and the voltage applied to each of the heating coils 10A to 12D can be adjusted. Therefore, the heating amount of the steel plate 2 by the heating coils 10A to 12D can be adjusted for each coil.
- the cross-sectional area change for the self-inductance adjustment will be described more specifically by taking the L adjuster 12A as an example.
- the part extended in parallel between the detour path 121 and the detour path 122 that is, the connecting part 111M and the connecting part 112M are arranged so that the separation distance can be adjusted.
- the connecting portions 111M and 112M are arranged to be movable up and down, and the L adjuster 112A adjusts the cross-sectional area of the region S by moving the connecting portions 111M and 112M up and down.
- the connecting portions 111M and 112M move up and down within the extended length range of the standing portions 111C, 111B, 112C and 112B, and the center point O of the region S is between the input / output terminals 111 and 112. It is preferable to move up and down so as to be located at the center of. That is, the moving distance of the connecting portion 111M from the state where the connecting portion 111M is positioned at the lowermost end and is substantially parallel to the input / output terminal 111 (the state where the connecting portion 111M is not detoured) The connecting portions 111M and 112M are moved up and down so as to be substantially equal to the downward moving distance of the connecting portion 112M from the state (not detoured) substantially parallel to the input / output terminal 112. Is done.
- the induction heating device 1 is connected to, for example, a bus bar or a matching device, it is necessary to change the connection position in the method of changing the width, which makes it difficult to design the device. high.
- the method of changing the height has a limit on the changeable height.
- the mutual inductance between the L regulators 12A to 12D when the mutual inductance is generated between the L regulators 12A to 12D described below, the mutual inductance between the L regulators 12A to 12D and the heating coils 10A to 10D can be geometrically separated. Mutual inductance adjustment between the regulators is easy.
- the connecting portions 111M and 112M are electrically connected and fastened to the standing portions 111C, 111B, 112C, and 112B by fastening means such as bolts, for example.
- the structure is completely different, and from other technical fields, as a technique for changing the voltage by adjusting the inductance, for example, a transformer for an electric furnace of an arc electric furnace as described in Patent Document 3 above can be cited.
- a transformer for an electric furnace of an arc electric furnace as described in Patent Document 3 above can be cited.
- the impedance in the circuit is adjusted by changing the distance between terminals of each phase of the three-phase power supply and changing the mutual inductance between phases in one circuit.
- the induction heating device 1 according to the present embodiment has a completely different configuration in order to adjust the self-inductance in one circuit.
- the induction heating apparatus 1 according to the present embodiment can make the voltage adjustment mechanism more compact than that of Patent Document 3 by using mutual reactance between the circuits as described below. .
- each of the L adjusters 12A to 12D is arranged along a direction (x-axis direction in FIG. 1) intersecting the extending direction of the electric path 11.
- the L adjusters 12A to 12D are arranged so that the center points O of the regions S of the L adjusters 12A to 12D are located on substantially the same straight line.
- the L adjusters 12A to 12D are arranged so that the cross section of the region S is substantially parallel along the same direction as the arrangement direction of the heating coils 10A to 12D. Be placed. That is, the standing portions 111C of the L adjusters 12A to 12D are formed to be parallel to each other. The other standing portions 111B, 112C, and 112B are formed in the same manner.
- the L adjusters 12A to 12D are preferably arranged in a direction parallel to the plate passing direction (x-axis direction) of the steel plate 2.
- each of the L adjusters 12A to 12D is arranged such that the gap D2 between the adjacent L adjusters 12A to 12D is 50 mm to 500 mm.
- mutual inductance is provided between at least the adjacent L adjusters 12A to 12D.
- the L adjusters 12A to 12D can improve the reactance adjustment effect and efficiency in the circuit by adjusting the self-inductance. Therefore, the width of the self-inductance adjustment by the L adjusters 12A to 12D can be reduced. That is, the cross-sectional area of the L adjusters 12A to 12D can be reduced, the overall configuration of the induction heating apparatus 1 can be reduced, and the apparatus can be made compact.
- the induction heating apparatus 1 according to the present embodiment can not only be made compact by performing self-inductance adjustment only by adjusting the height of the L adjusters 12A to 12D as described above, but also uses mutual inductance. Accordingly, the L adjusters 12A to 12D can be further downsized. Therefore, the voltage adjustment mechanism included in the induction heating apparatus 1 according to the present embodiment is much more compact than the voltage adjustment mechanism included in Patent Document 3, and the overall configuration of the apparatus can be reduced in size.
- the gap D2 between the adjacent L adjusters 12A to 12D is less than 50 mm, there is a possibility that discharge occurs between the adjacent L adjusters 12A to 12D when a high-frequency AC voltage is applied.
- the gap D2 between the adjacent L adjusters 12A to 12D exceeds 500 mm, the mutual inductance between the adjacent L adjusters 12A to 12D decreases.
- the relative arrangement positions of the L adjusters 12A to 12D will be described as follows from the viewpoint of mutual inductance.
- the mutual inductance between adjacent L regulators 12A to 12D is adjusted to 5 to 30% of the self-inductance of each L regulator 12A to 12D. be able to. If the mutual inductance exceeds 30% of the self-inductance, the current change amount of the heating coils 10A to 10D is too large with respect to the area change of one L regulator 12A to 12D. That is, in this case, the adjustment of the L adjusters 12A to 12D becomes too sensitive, and high-precision adjustment (adjustment in units of 1 mm) is necessary to control the temperature rising rate.
- the mutual inductance is less than 5% of the self-inductance, the amount of change in the current of the heating coils 10A to 10D is too small with respect to the area change of one L adjuster 12A to 12D, and the L adjusters 12A to 12D. It becomes difficult to downsize.
- the mutual inductance between the L adjusters 12A to 12D depends on the ratio of the area change of the L adjusters 12A to 12D with respect to the heating coils 10A to 10D and the ratio of the current change flowing through the heating coils 10A to 10D. Can be determined roughly. That is, when the value obtained by dividing the current change ratio by the area change ratio is 1.2, an increase (0.2) of this value corresponds to the mutual inductance. Therefore, in this case, the mutual inductance can be calculated to be 20% of the self-inductance of the L adjusters 12A to 12D.
- the L adjusters 12A to 12D are arranged such that a gap D3 between each of the heating coils 10A to 10D and each of the L adjusters 12A to 12D connected thereto is 500 mm to 2000 mm.
- a gap D3 between each of the heating coils 10A to 10D and each of the L adjusters 12A to 12D connected thereto is 500 mm to 2000 mm.
- the upper limit of 2000 mm of the gap D3 is determined by the impedance value of the entire circuit including the heating coils 10A to 10D and the L adjusters 12A to 12D, which can ensure the withstand voltage to ground. That is, when the gap D3 exceeds 2000 mm, not only does the configuration of the entire apparatus increase and compactness is prevented, but also the impedance of the entire circuit increases, and the potential difference between the coils increases, facilitating discharge.
- the width in the plate width direction (y-axis direction) of the steel plates 2 of the L adjusters 12A to 12D is, for example, 500 to 2500 mm (about 30 to 50 of the heating coils 10A to 10D). %),
- the height in the plate thickness direction (z-axis direction) of the steel plate 2 of the L adjusters 12A to 12D is preferably set to, for example, 100 to 200 mm (about 20 to 200% of the heating coils 10A to 10D).
- the width of the steel plates 2 of the L adjusters 12A to 12D in the plate passing direction J1 is set to be substantially the same as that of the heating coils 10A to 10D.
- the L adjusters 12A to 12D configured as described above can make the entire apparatus compact and can adjust the current amounts of the heating coils 10A to 10B.
- the L adjusters 12A to 12D do not use the resistors as in the above-mentioned Patent Document 2, so that no energy loss occurs due to the generation of Joule heat, and the induction heating apparatus 1 according to the present embodiment. Can improve energy efficiency.
- Each L adjuster 12A to 12D can adjust the self-inductance.
- the self-inductance is adjusted according to the material, thickness, width, etc. of the steel plate 2 to adjust the heating of the steel plate 2. Easy to do.
- the induction heating apparatus 1 adjusts the area of the L regulators 12A to 12D to adjust not only the self-inductance but also the mutual inductance, so that a constant heating rate is obtained even near the Curie point.
- the area adjustment of the L adjusters 12A to 12D when the temperature rising rate is kept constant in the high temperature range will be described below. It goes without saying that not only the area adjustment of the L adjusters 12A to 12D described below but also the above-described components and the like act to keep the temperature rising rate near the Curie point constant. Nor.
- the L adjusters 12A to 12D are generated by L adjusters 12D and 12A respectively connected to the foremost heating coil 10D and the last heating coil 10A in the longitudinal direction of the steel plate 2.
- the self-inductance is adjusted so as to be smaller than the self-inductance generated by the L adjusters 12C and 12B between them.
- the L adjusters 12A to 12D are adjusted so that the cross-sectional area in the region S of the L adjusters 12D and 12A is smaller than the cross-sectional area in the region S of the L adjusters 12C and 12B.
- the L adjusters 12D and 12A have a distance between the connecting portions 111M and 112M that is smaller than the distance between the connecting portions 111M and 112M in the L adjusters 12C and 12B. 12D is adjusted.
- the height of the L adjusters 12A to 12D will be described.
- the height of the L adjusters 12D and 12A is lower than the height of the L adjusters 12B and 12C.
- the reactance in the circuit in which the L regulators 12D and 12A are arranged becomes smaller than that of other circuits, and as a result, the heating coils 10D and 10A have a larger current than the heating coils 10C and 10B. Can flow.
- the heating density can be increased with the steel plate 2 corresponding to the heating coils 10D and 10A, and the steel plate in the vicinity of the Curie point.
- the heating rate of 2 can be kept constant.
- the width of the heating coils 10A to 10D (the width in the y-axis direction in FIG. 1) is 1000 mm, and the height (the length in the z-axis direction in FIG. 1, the distance W1 in FIG. 2). ) Is 400 mm, the coil length of each of the heating coils 10A to 10D is 100 mm, and the mutual distance D1 between the adjacent heating coils 10A to 10D is 50 mm (that is, in this case, the heating coils 10A to 10D are adjacent to each other).
- the mutual distance D1 is 1/8 times the inner distance W1 of the heating coils 10A to 10D in the height direction).
- the width of the L adjusters 12A to 12D (the width in the y-axis direction in FIG. 1) is 400 mm, and the height (the length in the z-axis direction in FIG. 1) is 0 mm (between the input / output terminals 111 and 112).
- the gap was changed from ⁇ 300 mm.
- FIG. 6 the horizontal axis represents each heating coil 10D, 10C, 10B, 10A, and the vertical axis represents the current flowing through each heating coil.
- “Fully open” means that when the L adjuster is opened, that is, the connecting portion 111M is positioned at the uppermost end, the connecting portion 112M is positioned at the lowermost end, and the cross-sectional area of the region S of the L adjuster is maximized. Means if you do.
- a state in which the height of the L adjuster (the distance between the coupling portions 111M and 112M) is 300 mm is shown.
- “Fully closed”, which is the opposite meaning of “fully open”, means that when the L adjuster is closed, that is, the connecting portion 111M is positioned at the lowest end and arranged on the straight line of the input / output terminal 111.
- 112M is positioned on the uppermost end and arranged on a straight line of the input / output terminal 112.
- a state in which the height of the L adjuster is 0 mm (a gap between the input / output terminals 111 and 112) is shown.
- the amount of current in the heating coils 10A and 10D at the foremost stage is increased.
- the L adjusters 12A to 12D bypass the electric path 111, and the currents of the heating coils 10A and 10D at both ends are affected by the mutual inductance resulting from the close arrangement of the heating coils 10A to 10D described above.
- the amount can be increased. That is, as a result of the inductance in the heating coils 10A and 10D at both ends being smaller than the inductance in the heating coils 10B and 10C between them, the amount of current in the heating coils 10A and 10D at both ends can be increased.
- the heating coils 10A and 10D at the foremost stage are further The amount of current increased.
- the current flowing through the heating coils 10B and 10C connected thereto decreases due to the inductance generated in the central L regulators 12B and 12C.
- the amount of current flowing through the heating coils 10A and 10D at both ends can be increased by the mutual inductance between the L adjusters 12A to 12D and the mutual inductance between the heating coils 10A to 10D.
- the change in the current amount of the heating coils 10A to 10D due to the height adjustment of the L adjusters 12A to 12D is that the mutual distance D1 between the adjacent heating coils 10A to 10D is the inner side in the height direction of the heating coils 10A to 10D. If the distance W1 is changed to 1/10 times or more and 1/3 times or less, and the widths of the heating coils 10A to 10D are changed to 1000 mm, 1500 mm, and 2000 mm, the same tendency can be obtained.
- the rate of temperature increase in the entire temperature range can be made uniform by making the center fully open. This will be described with reference to FIGS.
- FIG. 7 is an explanatory diagram for schematically explaining the rate of temperature rise in the longitudinal direction of the steel plate 2 by the induction heating apparatus 1 according to the present embodiment
- FIG. 8 is a graph showing the rate of temperature rise when both ends are fully opened.
- FIG. 9 is a graph showing the temperature increase rate in the center fully open state.
- the positions x1, x2, and x3 of the steel plate 2 in the longitudinal direction shown in FIG. 7A are respectively the center of the heating coils 10A to 10D, the rear of x1 to 100 mm (the center of the heating coil 10B), and the rear of x3 to 300 mm (the heating coil 10A). Center).
- measured value L1, L2, L3 shown in FIG.8 and FIG.9 shows the temperature change of the steel plate 2 in position x1, x2, x3, respectively.
- the temperature increase rate at the position x3 (the slope of L3) is the temperature increase rate at the positions x1 and x2 (L1). , L2 slope). This is because the temperature of the steel plate 2 becomes a high temperature region in the vicinity of the Curie point (for example, about 770 ° C.) (for example, about 650 ° C.), and the magnetic permeability of the steel plate 2 decreases, resulting in a decrease in the rate of temperature increase.
- the Curie point for example, about 770 ° C.
- the magnetic permeability of the steel plate 2 decreases, resulting in a decrease in the rate of temperature increase.
- the temperature increase rate at the position x3 (the slope of L3) is the temperature increase at the positions x1 and x2.
- the speed (slope of L1 and L2) approaches about 100 ° C./s. Therefore, the fall of the temperature increase rate of the steel plate 2 in the temperature range near the Curie point can be reduced.
- the temperature increase rate of the steel plate 2 in this case is roughly described throughout the induction heating apparatus 1 as follows.
- the decrease in the heating rate in the central heating coils 10B and 10C has less influence than the effect due to the increase in the heating rate in the heating coils 10A and 10D at both ends. This is because the mutual reactance works between the L adjusters 12 to 12D.
- the coil current was about 3000 A at the maximum.
- a current of about 4500 A is required. That is, according to the induction heating device 1 according to the present embodiment, the energy consumption can be reduced by about 33%. This amount of reduction corresponds to the power for about several thousand households of household power consumption. Further, this energy reduction is greatly effected by the mutual inductance of the L regulators 12A to 12D. Even if a variable capacitor is used as in Patent Document 1, it is difficult to realize such energy reduction.
- FIG. 10 is a graph showing the current ratio of the heating coils 10A to 10D to the area ratio of the L adjusters 12A to 12D.
- the horizontal axis of FIG. 10 shows the ratio of the area of the L adjusters 12A and 12D at both ends to the area of the center L adjusters 12B and 12C, and the vertical axis indicates the current of the heating coils 10A and 10D at both ends.
- the ratio of the currents in the central heating coils 10B and 10C with respect to is shown.
- the current ratio of the heating coil can be changed by changing the area ratio of the L regulator. Specifically, when the areas of the central L adjusters 12B and 12C and the L adjusters 12A and 12D at both ends are made equal (when the area ratio is set to 1), the heating coils 10A at both ends rather than the central heating coils 10B and 10C. , 10D is greater in current. On the other hand, when the area of the central L adjusters 12B and 12C is larger than that of the L adjusters 12A and 12D at both ends (for example, when the area ratio is 0.8), the currents of the heating coils 10A and 10D at both ends are further increased.
- the current can be increased approximately 0.5 times from 0.5 to 1.0. That is, it can be seen that the amount of current can be efficiently controlled by changing the areas of the L adjusters 12A to 12D. This is because the L regulators 12A to 12D not only generate self-inductance, but also generate mutual inductance between each other.
- FIG. 11 is a graph showing the AC voltage with respect to the frequency of the AC voltage of the AC power supply 3 in the induction heating apparatus 1 according to the present embodiment.
- the current I to be passed through the heating coils 10A to 10D is determined by the use of the heating range / heating rate of the steel sheet 1 to be heated.
- a voltage between the coil voltage of the heating coils 10A to 10D and the bus bar is generated by the current and its frequency (voltage frequency) and the inductance of the coil by each coil and bus bar.
- the coil voltage is restricted by the following (Equation 1) due to the allowable voltage or supply voltage of the apparatus.
- Equation 1 the relationship between the operating frequency f and L ⁇ I (that is, the coil voltage) is as shown in the graph of FIG.
- the operating frequency f in a range of 50 kHz to 500 kHz, for example.
- the inductance due to the coil including the L adjusters 12A to 12D is 99% or more of the total inductance. Therefore, the influence of the load caused by the steel plate 2 as the core is suppressed, and the L adjusters 12A to 12D are suppressed.
- the current flowing through each of the heating coils 10A to 10D can be adjusted.
- the operating frequency f When the operating frequency f is less than 50 kHz, the effect of adjusting the current by the L adjusters 12A to 12D becomes small due to the influence of the resistance by the steel plate 2 as the core. On the other hand, if the operating frequency f exceeds 500 kHz, the margin of withstand voltage to ground decreases with respect to the inductance change by the L adjusters 12A to 12D, and the range of height adjustment of the L adjusters 12A to 12D is limited to a narrow range. It becomes difficult to adjust the current appropriately.
- the fastening means of the connecting portions 111M and 112M is, for example, a bolt, but the present invention is not limited to such an example.
- the connecting means only needs to be able to electrically connect the connecting portion and the standing portion,
- a latch or the like may be used.
- the latch can be released by, for example, a driving means such as a motor, and the fastening state can be released, and the connecting portions 111M and 112M can be automatically moved up and down by another driving means. .
- the amount of current in each of the heating coils 10A to 10D, the temperature of the steel plate 2 at the corresponding position, and the like are measured, so that the desired heating rate and the like are automatically realized. It is also possible to move 112M up and down.
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Abstract
Description
なお、加熱コイルの個数とは、1つの電源から電気的に並列に分岐した加熱コイルの数を指す。
まず、図1~図3を参照して、本発明の第1実施形態に係る誘導加熱装置の構成について説明する。図1は、本発明の第1実施形態に係る誘導加熱装置を示す斜視図であり、図2は、本実施形態に係る誘導加熱装置を鋼板の通板方向から見た側面図であり、図3は、本実施形態に係る誘導加熱装置を上方から見た上面図である。
誘導加熱装置1は、上記の鋼板1の長手方向の磁束を発生させるために、図1及び図2に示すように、鋼板2を取囲むように配置された少なくとも3つ以上の加熱コイルを有する。尚、本実施形態では、説明の便宜上、誘導加熱装置1が4つの加熱コイル10A~10Dを有する場合について説明する。しかし、加熱コイルの個数は、4つに限定されるものではなく、4つ以外の3つの加熱コイルを備える場合、誘導加熱装置1は、他の構成も加熱コイルに対応した個数を備える。
また、加熱コイル10A~10Dのそれぞれは、相隣接する加熱コイル10A~10Dの相互距離D1が加熱コイル10A~10Dの高さ方向の内側の距離W1の1/10倍以上1/3倍以下となるように、配置される。このように相隣接した加熱コイル10A~10Dの相互距離D1を、加熱コイル10A~10Dの高さ方向の内側の距離W1の1/10以上1/3以下とすることにより、各加熱コイル10A~10Dは、鋼板2の加熱速度を一定に保つことができ、加熱効率を高めることができる。よって、この構成によれば、キュリー点近傍で低下する鋼板2の透磁率に起因する加熱量の不足を、近接するかねるコイル10A~10Dの加熱領域で補うことができる。
この加熱コイル10A~10Dには、交流電源3から交流電圧が印加される。この交流電圧を印加する端子として、各加熱コイル10A~10Dのそれぞれには、電気経路11が延設され、この電気経路11のそれぞれに交流電源3からの交流電圧が印加される。換言すれば、電気経路11は、交流電源3と各加熱コイル10A~10Dとを電気的に接続し、交流電源3からの交流電圧を各加熱コイル10A~10Dに印加し、交流電源3からの電流を入出力させるために用いられる入出力導線である。
各加熱コイル10A~10Dと交流電源3との間の電気経路11のそれぞれの電気経路上には、L調整器12A~12Dが挿入配置される。
L調整器12A~12Dは、自己インダクタンスを調整して、回路内のリアクタンスを調整可能なインダクタンス調整器の一例であって、電気経路11を略コイル状に迂回させる。より具体的には、L調整器12A~12Dは、図2に示すように、電気経路11を構成する一方の入出力端子111を上方(z軸正の方向)に迂回させ,他方の入出力端子112を下方(z軸負の方向)に迂回させることにより、L調整器12A~12Dが配置された位置において、一方の入出力端子111と他方の入出力端子112とを離隔させる。換言すれば、L調整器12A~12Dは、電気経路11の入出力端子111,112のそれぞれを略コの字状に迂回させる。その結果、L調整器12A~12Dは、入出力端子111,112が迂回された迂回経路121,122により取囲まれた領域Sを形成する。この領域Sを取囲む入出力端子111,112の迂回経路121,122は、シングルターンコイルのような略コイル形状を形成する。かかる構成を有するL調整器12A~12Dは、略コイル状の形状を有するので、交流電源3から交流電流が流れると(交流電圧が印加されると)自己誘導を発生させる。
L調整器12Aは、立設部111C,111B,112C,112Bと、連結部111M,112Mとを有する。立設部111Cは、加熱コイル10Aから延設された入出力端子111を鉛直方向(z軸方向)上方に向けて折曲げることにより形成され、立設部111Bは、交流電源3が接続される入出力端子111を同様に折曲げることにより形成される。よって、立設部111Cと立設部111Bとは、略平行に立設される。そして、連結部111Mは、この立設部111Cと立設部111Bとの間を電気的に接続する。この立設部111C,111B及び連結部111Mが、迂回経路121を形成する。
また、L調整器12A~12Dのそれぞれは、各自の自己インダクタンスを調整可能に構成される。具体的には、L調整器12A~12Dは、迂回経路121,122により取囲まれた領域Sの断面積(yz平面内への投影面積)、つまり略コイル状を形成する面の面積を変更することにより、自己インダクタンスを調整することができる。尚、コイルの自己インダクタンスは、例えば巻数・コイル半径・コイル長・導線の径・周囲の透磁率(コア、つまり鋼板2の透磁率)等により決定されるので、コイルの断面積を変えて例えばコイル半径等を変更することにより、コイルのインダクタンスを調整することができる。よって、L調整器12A~12Dは、領域Sの断面積を変更することにより、自己インダクタンスを調整することができる。よって、L調整器12A~12Dにより、回路中のリアクタンスを調整して、加熱コイル10A~12Dのそれぞれに印加する電圧を調整することができる。よって、加熱コイル10A~12Dによる鋼板2の加熱量を、各コイル毎に調整することができる。
また、各L調整器12A~12Dのそれぞれは、電気経路11の延設方向と交差する方向(図1のx軸方向)に沿って配置される。換言すれば、図2に示すように、各L調整器12A~12Dの領域Sの中心点Oが略同一直線上に位置するように、各L調整器12A~12Dは配置される。より具体的には、図1等に示すように、各L調整器12A~12Dは、加熱コイル10A~12Dの配列方向と同様の方向に沿って、領域Sの断面が略平行になるように配置される。つまり、各L調整器12A~12Dの立設部111C同士は、平行となるように折曲げて形成される。他の立設部111B,112C,112Bも同様に形成される。また、この際、各L調整器12A~12Dは、鋼板2の通板方向(x軸方向)と平行な方向に並べられることが好ましい。
また、L調整器12A~12Dは、各加熱コイル10A~10Dとそれに接続された各L調整器12A~12Dとの間の間隙D3が500mm~2000mmとなるように配置される。この間隙D3を空けてL調整器12A~12Dを配置することにより、L調整器12A~12Dによるインダクタンス調整をより容易かつ安定して行うことができる。すなわち、この間隙D3が500mm未満である場合には、L調整器12A~12Dで発生する磁場が加熱コイル10A~10Dに干渉してしまい、両者の間に相互インダクタンスが発生する。よって、L調整器12A~12Dの調整が困難になる。一方、間隙D3の上限2000mmは、対地間耐圧を確保することが可能な、加熱コイル10A~10DとL調整器12A~12Dを含めた回路全体のインピーダンスの値により決定される。つまり、間隙D3が2000mm超過の場合には、装置全体の構成が大きくなりコンパクト化を妨げるだけでなく、回路全体のインピーダンスが増加し、コイル間の電位差が増加して放電し易くなる。
以上のように構成されるL調整器12A~12Dは、装置全体のコンパクト化が可能で、かつ、加熱コイル10A~10Bそれぞれの電流量を調整することが可能である。電流量を調整する際、このL調整器12A~12Dは、上記特許文献2のような抵抗を使用しないため、ジュール熱の発生によるエネルギー損失が発生せず、本実施形態に係る誘導加熱装置1は、エネルギー効率を向上させることができる。また、各L調整器12A~12Dは、自己インダクタンスを調整することができるため、例えば、鋼板2の材質や板厚、板幅等に応じて、自己インダクタンスを調整して鋼板2の加熱を調整することが容易である。
更に、本実施形態に係る誘導加熱装置1は、L調整器12A~12Dの面積を調整することにより自己インダクタンスだけでなく相互インダクタンスをも調整することにより、キュリー点近傍においても一定の昇温速度を保つことを可能にしている。高温域において昇温速度を一定に保つ際のL調整器12A~12Dの面積調整について、以下で説明する。なお、以下で説明するL調整器12A~12Dの面積調整だけでなく、上記の各構成等も作用してキュリー点近傍における昇温速度を一定に保つことを可能にしていることは、いうまでもない。
このL調整器12A~12Dの調整による電流量や加熱密度の変化について、実施例を示す。この本実施形態に係る実施例では、加熱コイル10A~10Dの幅(図1のy軸方向の幅)は、1000mmとし、高さ(図1のz軸方向の長さ、図2の距離W1)は、400mmとし、各加熱コイル10A~10Dのコイル長さは100mm、相隣接した加熱コイル10A~10Dの相互距離D1は、50mmとした(つまりこの場合、相隣接した加熱コイル10A~10Dの相互距離D1は、加熱コイル10A~10Dの高さ方向の内側の距離W1の1/8倍)。そして、L調整器12A~12Dの幅(図1のy軸方向の幅)は、400mmとして、高さ(図1のz軸方向の長さ)は、0mm(入出力端子111,112間の間隙)~300mmまで変化させた。
図7は、本実施形態に係る誘導加熱装置1による鋼板2の長手方向における昇温速度を概略的に説明するための説明図であり、図8は、両端全開における昇温速度を表したグラフであり、図9は、中央全開における昇温速度を表したグラフである。
図10は、L調整器12A~12Dの面積比に対する加熱コイル10A~10Dの電流比を表したグラフである。
次に、図11を参照して、本実施形態に係るL調整器12A~12Dを有する誘導加熱装置1に印加する交流電圧の周波数(運転周波数ともいう。)について説明する。図11は、本実施形態に係る誘導加熱装置1において、交流電源3の交流電圧の周波数に対する交流電圧を示すグラフである。
コイル電圧[V]=2×π×(運転周波数f[Hz])
×(コイルのインダクタンスL[H])×コイル電流I
≦30kV ・・・(数式1)
例えばラッチ等を使用してもよい。ラッチ等を使用する場合、例えばモータ等の駆動手段により、ラッチを外して締結状態を解除することができ、他の駆動手段により、自動で連結部111M,112Mを上下動させることも可能である。この場合、例えば、各加熱コイル10A~10Dでの電流量や対応した位置での鋼板2の温度などを測定して、所望の昇温速度などが実現されるように、自動で連結部111M,112Mを上下動させることも可能である。
Claims (13)
- ソレノイド方式により鋼板を連続的に加熱する誘導加熱装置であって、
前記鋼板が内部を通過するように、前記鋼板の長手方向に沿って配置された少なくとも3つの加熱コイルを有し、
更に、前記加熱コイルのそれぞれと当該加熱コイルのそれぞれに電圧を印加する電源とを電気的に接続する電気経路上に配置され、自己誘導を発生させ、かつ、当該自己誘導における自己インダクタンスを調整可能なインダクタンス調整器が前記加熱コイルのそれぞれに備わっており、
を有し、
前記インダクタンス調整器のそれぞれは、少なくとも相隣接した前記インダクタンス調整器の間に相互誘導が発生するように配置されることを特徴とする、誘導加熱装置。 - 前記鋼板の長手方向における最前段の前記加熱コイル及び最後段の前記加熱コイルに備わっている前記インダクタンス調整器のそれぞれが発生させる自己インダクタンスは、前記最前段の加熱コイルと前記最後段の加熱コイルとの間に配置された前記加熱コイルの前記インダクタンス調整器が発生させる自己インダクタンスよりも小さくなるように調整されることを特徴とする、請求の範囲1に記載の誘導加熱装置。
- 相隣接した前記加熱コイルの相互距離は、前記加熱コイルの高さ方向の内側の距離の1/10以上1/3以下であり、
前記インダクタンス調整器のそれぞれは、前記電気経路に対して交差する方向に迂回経路を形成することによって構成され、
前記相隣接したインダクタンス調整器同士の間隙は、50mm~500mmであることを特徴とする、請求の範囲2に記載の誘導加熱装置。 - 前記インダクタンス調整器のそれぞれは、当該インダクタンス調整器が配置された前記電気経路を略コイル状に迂回させることにより前記自己誘導を発生させ、かつ、迂回させた前記電気経路の略コイル状の迂回経路に囲まれた領域の断面積を変更することにより前記自己誘導における自己インダクタンスを調整することを特徴とする、請求の範囲3に記載の誘導加熱装置。
- 前記加熱コイルのそれぞれと前記電源とを接続する前記電気経路のそれぞれは、前記加熱コイルのそれぞれから長尺状に延設された一対の入出力端子により構成され、
前記インダクタンス調整器は、前記一対の入出力端子の一方と他方とが互いに離隔するように前記一対の入出力端子を迂回させ、かつ、前記迂回経路における前記一対の入出力端子の一方と他方との間の距離を変更して前記迂回経路に囲まれた領域の前記断面積を変更することを特徴とする、請求の範囲4に記載の誘導加熱装置。 - 前記加熱コイルのそれぞれと当該加熱コイルに接続された前記インダクタンス調整器との間隙は、500mm~2000mmであることを特徴とする、請求の範囲5に記載の誘導加熱装置。
- 前記加熱コイルのそれぞれは、シングルターンコイル又はダブルターンコイルであることを特徴とする、請求の範囲6に記載の誘導加熱装置。
- ソレノイド方式により鋼板を連続的に加熱する誘導加熱方法であって、
少なくとも3つの加熱コイルを、前記鋼板が内部を通過するように前記鋼板の長手方向に沿って配置し、
自己誘導を発生させ、かつ、当該自己誘導における自己インダクタンスを調整可能なインダクタンス調整器を、前記加熱コイルのそれぞれと当該加熱コイルのそれぞれに電圧を印加する電源とを電気的に接続する電気経路上において、少なくとも相隣接した前記インダクタンス調整器の間に相互誘導が発生するように前記加熱コイルのそれぞれに配置して、
前記鋼板の長手方向の最前段の前記加熱コイル及び最後段の前記加熱コイルに備わっている前記インダクタンス調整器のそれぞれが発生させる自己インダクタンスを、前記最前段の加熱コイルと前記最後段の加熱コイルとの間に配置された前記加熱コイルの前記インダクタンス調整器が発生させる自己インダクタンスよりも小さくなるように調整することを特徴とする、誘導加熱方法。 - 相隣接した前記加熱コイルの相互距離は、前記加熱コイルの高さ方向の内側の距離の1/10以上1/3以下であり、
前記インダクタンス調整器のそれぞれは、前記電気経路に対して交差する方向に迂回経路を形成することによって構成され、
前記相隣接したインダクタンス調整器同士の間隙は、50mm~500mmであることを特徴とする、請求の範囲8に記載の誘導加熱方法。 - 前記インダクタンス調整器のそれぞれは、当該インダクタンス調整器が配置された前記電気経路を略コイル状に迂回させることにより前記自己誘導を発生させ、かつ、迂回させた前記電気経路の略コイル状の迂回経路に囲まれた領域の断面積を変更することにより前記自己誘導における自己インダクタンスを調整することを特徴とする、請求の範囲9に記載の誘導加熱方法。
- 前記加熱コイルのそれぞれと前記電源とを接続する前記電気経路のそれぞれは、前記加熱コイルのそれぞれから長尺状に延設された一対の入出力端子により構成され、
前記インダクタンス調整器は、前記一対の入出力端子の一方と他方とが互いに離隔するように前記一対の入出力端子を迂回させ、かつ、前記迂回経路における前記一対の入出力端子の一方と他方との間の距離を変更して前記迂回経路に囲まれた領域の前記断面積を変更することを特徴とする、請求の範囲10に記載の誘導加熱方法。 - 前記加熱コイルのそれぞれと当該加熱コイルに接続された前記インダクタンス調整器との間隙は、500mm~2000mmであることを特徴とする、請求の範囲11に記載の誘導加熱方法。
- 前記加熱コイルのそれぞれは、シングルターンコイル又はダブルターンコイルであることを特徴とする、請求の範囲12に記載の誘導加熱方法。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011129292A (ja) * | 2009-12-16 | 2011-06-30 | Miyaden Co Ltd | 誘導加熱コイル |
JP2014175076A (ja) * | 2013-03-06 | 2014-09-22 | Tokuden Co Ltd | 誘導加熱装置 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5659094B2 (ja) * | 2011-07-04 | 2015-01-28 | 東芝三菱電機産業システム株式会社 | 誘導加熱装置 |
KR101600555B1 (ko) * | 2014-06-11 | 2016-03-08 | 주식회사 다원시스 | 도전성의 판재를 가열하기 위한 유도 가열 장치 |
JP6561953B2 (ja) * | 2016-09-21 | 2019-08-21 | 株式会社オートネットワーク技術研究所 | 磁性コア、及びリアクトル |
JP7134591B2 (ja) * | 2016-09-23 | 2022-09-12 | 日本製鉄株式会社 | 連続溶融亜鉛めっき方法及び連続溶融亜鉛めっき装置 |
SE1750017A1 (sv) * | 2017-01-11 | 2018-07-03 | Tc Tech Sweden Ab Publ | Method and arrangement for metal hardening |
RU180828U1 (ru) * | 2018-01-25 | 2018-06-26 | Александр Владимирович Гладышев | Волновая энергетическая установка |
CN108486316B (zh) * | 2018-03-30 | 2019-07-26 | 燕山大学 | 一种变径式线圈对重载凸轮轴感应加热的装置及方法 |
JP2022044338A (ja) * | 2020-09-07 | 2022-03-17 | トヨタ自動車株式会社 | 熱処理装置および熱処理方法 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56106388A (en) * | 1980-01-25 | 1981-08-24 | Meidensha Electric Mfg Co Ltd | Induction heater |
JPH0326094U (ja) * | 1989-07-25 | 1991-03-18 | ||
JPH11257850A (ja) | 1998-03-10 | 1999-09-24 | Nara Prefecture | 誘電加熱方法及び装置 |
JP2000100552A (ja) * | 1998-09-24 | 2000-04-07 | Shimada Phys & Chem Ind Co Ltd | 誘導加熱装置 |
JP2001021270A (ja) | 1999-07-12 | 2001-01-26 | Nkk Corp | 三相交流アーク式電気炉 |
JP2003243137A (ja) | 2002-02-15 | 2003-08-29 | Mitsubishi Electric Corp | 誘導加熱装置 |
JP2004259665A (ja) * | 2003-02-27 | 2004-09-16 | Mitsui Eng & Shipbuild Co Ltd | 誘導加熱方法及び装置 |
JP2005206906A (ja) | 2004-01-26 | 2005-08-04 | Nippon Steel Corp | 鋼板の誘導加熱方法 |
JP2007012482A (ja) * | 2005-06-30 | 2007-01-18 | Mitsubishi Electric Corp | 誘導加熱調理器 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55114477A (en) * | 1979-02-26 | 1980-09-03 | Nippon Kokan Kk <Nkk> | Method and device for production of electric welded tube |
US4357512A (en) * | 1980-07-23 | 1982-11-02 | Sumitomo Kinzoku Kogyo Kabushiki Kaisha | Apparatus for continuous manufacture of butt-welded pipe |
US4778971A (en) * | 1986-05-23 | 1988-10-18 | Kabushiki Kaisha Meidensha | Induction heating apparatus |
JPH0349561A (ja) * | 1989-07-14 | 1991-03-04 | Mitsubishi Heavy Ind Ltd | 合金化用誘導加熱における電源制御装置 |
WO2001007890A2 (en) * | 1999-07-21 | 2001-02-01 | Dako A/S | A method of controlling the temperature of a specimen in or on a solid support member |
FR2808163B1 (fr) * | 2000-04-19 | 2002-11-08 | Celes | Dispositif de chauffage par induction a flux transverse a circuit magnetique de largeur variable |
JP3676215B2 (ja) * | 2000-09-22 | 2005-07-27 | 電気興業株式会社 | カムシャフトの低歪高周波焼入方法とその装置 |
US6570141B2 (en) * | 2001-03-26 | 2003-05-27 | Nicholas V. Ross | Transverse flux induction heating of conductive strip |
RU2240659C2 (ru) * | 2002-09-23 | 2004-11-20 | Общество с ограниченной ответственностью (ООО) "Магнит" | Устройство индукционного нагрева с секционированным индуктором (варианты) |
DE10312623B4 (de) * | 2003-03-19 | 2005-03-24 | Universität Hannover | Querfeld-Erwärmungsanlage |
JP4295141B2 (ja) * | 2004-03-12 | 2009-07-15 | 株式会社吉野工作所 | ワーク加熱装置及びワーク加熱方法 |
TWI326713B (en) * | 2005-02-18 | 2010-07-01 | Nippon Steel Corp | Induction heating device for heating a traveling metal plate |
US9888529B2 (en) * | 2005-02-18 | 2018-02-06 | Nippon Steel & Sumitomo Metal Corporation | Induction heating device for a metal plate |
JP5114671B2 (ja) * | 2007-04-16 | 2013-01-09 | 新日鐵住金株式会社 | 金属板の誘導加熱装置および誘導加熱方法 |
-
2008
- 2008-04-09 JP JP2008101622A patent/JP5038962B2/ja active Active
-
2009
- 2009-03-12 WO PCT/JP2009/054734 patent/WO2009125645A1/ja active Application Filing
- 2009-03-12 RU RU2010145273/07A patent/RU2449510C1/ru active
- 2009-03-12 KR KR1020107022532A patent/KR101215662B1/ko active IP Right Grant
- 2009-03-12 EP EP09730349.9A patent/EP2265089B1/en active Active
- 2009-03-12 CN CN2009801115724A patent/CN102100124B/zh active Active
- 2009-03-12 BR BRPI0911174-3A patent/BRPI0911174B1/pt active IP Right Grant
- 2009-03-12 PL PL09730349T patent/PL2265089T3/pl unknown
- 2009-03-12 US US12/918,555 patent/US8420990B2/en active Active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56106388A (en) * | 1980-01-25 | 1981-08-24 | Meidensha Electric Mfg Co Ltd | Induction heater |
JPH0326094U (ja) * | 1989-07-25 | 1991-03-18 | ||
JPH11257850A (ja) | 1998-03-10 | 1999-09-24 | Nara Prefecture | 誘電加熱方法及び装置 |
JP2000100552A (ja) * | 1998-09-24 | 2000-04-07 | Shimada Phys & Chem Ind Co Ltd | 誘導加熱装置 |
JP2001021270A (ja) | 1999-07-12 | 2001-01-26 | Nkk Corp | 三相交流アーク式電気炉 |
JP2003243137A (ja) | 2002-02-15 | 2003-08-29 | Mitsubishi Electric Corp | 誘導加熱装置 |
JP2004259665A (ja) * | 2003-02-27 | 2004-09-16 | Mitsui Eng & Shipbuild Co Ltd | 誘導加熱方法及び装置 |
JP2005206906A (ja) | 2004-01-26 | 2005-08-04 | Nippon Steel Corp | 鋼板の誘導加熱方法 |
JP2007012482A (ja) * | 2005-06-30 | 2007-01-18 | Mitsubishi Electric Corp | 誘導加熱調理器 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011129292A (ja) * | 2009-12-16 | 2011-06-30 | Miyaden Co Ltd | 誘導加熱コイル |
JP2014175076A (ja) * | 2013-03-06 | 2014-09-22 | Tokuden Co Ltd | 誘導加熱装置 |
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