Transverse-type induction heating device

Abstract

In the present invention, the volumes of cores (1120, 1220) are made to differ between a heating upstream-side area and a heating downstream-side area.

Description

Transverse type induction heating device

[0001] The present invention relates to a transverse induction heating device. This application claims priority to Japanese Patent Application No. 2022-121377, filed on July 29, 2022, the contents of which are incorporated herein by reference in their entirety.

[0002] An induction heating device is an apparatus for heating a conductive plate. The induction heating device has a coil. An alternating magnetic field (AC magnetic field) is generated from the coil of the induction heating device. The alternating magnetic field induces eddy currents in the conductive plate. The conductive plate is heated by Joule heat based on the eddy currents. One such induction heating device is a transverse type induction heating device. The transverse type induction heating device induces eddy currents in the conductive plate by causing an alternating magnetic field to cross the conductive plate approximately perpendicularly (preferably perpendicularly).

[0003] Technologies of transverse type induction heating devices are described in Patent Documents 1 to 3. Patent Document 1 discloses that a single U-shaped core, a core with two U-shaped cores arranged side by side, and a core with three or more U-shaped cores arranged side by side are used as the core of a transverse type induction heating device.

[0004] Patent Document 2 also discloses that a core (E-shaped core) in which the two U-shaped cores described above are arranged side by side is used as the core of a transverse type induction heating device.

[0005] Furthermore, Patent Document 3 discloses that a core having a plurality of legs arranged in a staggered pattern at regular intervals in the conveying direction of the conductive plate is used as the core of a transverse type induction heating device.

[0006] Japanese Patent Application Laid-Open No. 2010-257894 Japanese Patent Application Laid-Open No. 2010-27470 Japanese Utility Model Application Laid-Open No. 2-69959

[0007] However, in the techniques described in Patent Documents 1 to 3, the alternating magnetic field that crosses the conductor plate is uniform between the entry side (upstream side in the conveying direction of the conductor plate) and the exit side (downstream side in the conveying direction of the conductor plate) of the transverse type induction heating device. Therefore, the amount of heat applied to the conductor plate is the same between the entry side and the exit side of the transverse type induction heating device. Therefore, there is a risk that the quality required for the conductor plate will not be met.

[0008] The present invention has been made in consideration of the above problems, and aims to provide a transverse type induction heating device that can induction heat a conductor plate so as to meet the quality required for the conductor plate.

[0009] The transverse type induction heating device of the present invention has an upper inductor and a lower inductor arranged to face each other with a conductor plate therebetween, and induction heats the conductor plate by crossing an alternating magnetic field across the plate surface of the conductor plate, wherein the upper inductor and the lower inductor each have a coil and a core, and the volume of one of the cores in the upper inductor and the volume of one of the cores in the lower inductor are different between an upstream heating region and a downstream heating region of the one core, respectively, and the upstream heating region of the core is a region upstream of a reference position of the core in the conveying direction of the conductor plate, and the downstream heating region of the core is a region further downstream of the reference position of the core in the conveying direction of the conductor plate. the reference position of the core is a midpoint in the heating length direction between the most upstream end position of the coil of the core and the most downstream end position of the coil of the core, the heating length direction is a direction parallel to the conveying direction of the conductor plate, the most upstream end position of the coil of the core is the end position of the end of the coil arranged relative to the core that is located most upstream in the heating length direction, and the most downstream end position of the coil of the core is the end position of the end of the coil arranged relative to the core that is located most downstream in the heating length direction, the same main magnetic flux flows in the one core that the upper inductor has and the same main magnetic flux flows in the one core that the lower inductor has, and the main magnetic flux is magnetic flux that passes through the conductor plate.

[0010] FIG. 1 is a cross-sectional view showing an example of a transverse type induction heating device. FIG. 2A is a plan view showing an example of a transverse type induction heating device. FIG. 2B is a bottom view showing an example of a transverse type induction heating device. FIG. 3 is a rear view showing an example of a transverse type induction heating device. FIG. 4 is a front view showing an example of a transverse type induction heating device. FIG. 5 is a conceptual diagram showing an example of a main magnetic flux flowing in an induction heating device. FIG. 6A is a conceptual diagram showing an example of the amount of heat generated by a conductor plate heated using the induction heating device of this embodiment. FIG. 6B is a conceptual diagram showing an example of the amount of heat generated by a conductor plate heated using two general induction heating devices.

[0011] An embodiment of the present invention will be described below with reference to the drawings. The term "sameness" in terms of length, position, size, spacing, etc., includes not only exact identicalness but also differences within the spirit of the invention (e.g., differences within the tolerances established at the time of design). In each figure, only the parts necessary for explanation are shown, simplified as necessary, for the sake of convenience. In each figure, the x-y-z coordinate system indicates the orientation relationship in each figure. A symbol with a cross mark (×) inside a white circle (○) indicates an axis whose positive direction is from the front to the back of the page. A symbol with a black circle (●) inside a white circle (○) indicates an axis whose positive direction is from the back to the front of the page. This embodiment illustrates a case in which the x-y plane is the horizontal plane and the z-axis direction is the height direction.

[0012] 1 to 4 are diagrams showing an example of a transverse-type induction heating device. In this embodiment, the conveying direction of the conductor plate M is the positive direction of the y-axis, the width direction of the conductor plate M is the x-axis direction, and the thickness direction of the conductor plate M is the z-axis direction. In this case, the upstream side of the conveying direction of the conductor plate M is the negative direction of the y-axis, and the downstream side is the positive direction of the y-axis. Here, the direction parallel to the conveying direction of the conductor plate M (the positive direction of the y-axis) (i.e., the y-axis direction) is referred to as the heating length direction. The heating length direction corresponds to the longitudinal direction of the conductor plate M.

[0013] FIG. 1 shows a cross section (y-z cross section) of a transverse type induction heating device 1000 cut perpendicular to the width direction (x-axis direction) of the conductor plate M. FIG. 2A shows a top view (plan view) of the transverse type induction heating device 1000 as viewed from above (positive side of the z-axis). FIG. 2B shows a bottom view (bottom view) of the transverse type induction heating device 1000 as viewed from below (negative side of the z-axis). FIG. 3 shows a rear view (rear view) of the transverse type induction heating device 1000 as viewed from the upstream side (negative side of the y-axis) in the conveyance direction of the conductor plate M. FIG. 4 shows a front view (front view) of the transverse type induction heating device 1000 as viewed from the downstream side (positive side of the y-axis) in the conveyance direction of the conductor plate M. In the following description, the conveying direction of the conductor plate M will be abbreviated as the conveying direction as necessary, the width direction of the conductor plate M will be abbreviated as the width direction as necessary, and the thickness direction of the conductor plate M will be abbreviated as the thickness direction as necessary.

[0014] The transverse type induction heating device 1000 induces heating of the conductor plate M by applying an alternating magnetic field substantially perpendicularly (preferably perpendicularly) to the surface of the conductor plate M being transported. The conductor plate M is, for example, a metal plate such as a steel plate. In the following description, the transverse type induction heating device will be abbreviated as "induction heating device" as necessary. An example of the configuration of the induction heating device 1000 will be described below. The dimensions (W １ ~W ５ ) will be described later in the (Design Method) section.

[0015] (Induction Heating Device 1000) The induction heating device 1000 includes an upper inductor 1100 and a lower inductor 1200. The upper inductor 1100 and the lower inductor 1200 are disposed facing each other with a gap in the thickness direction (z-axis direction) of the conductor plate M sandwiched therebetween. The thickness direction (z-axis direction) of the conductor plate M corresponds to the direction in which the upper inductor 1100 and the lower inductor 1200 face each other. The induction heating device 1000 shown in FIGS. 1 to 4 illustrates a case in which the upper inductor 1100 and the lower inductor 1200 are in a plane-symmetric relationship with respect to a virtual plane SL. The virtual plane SL is a plane that passes through the center of the conductor plate M in the thickness direction (z-axis direction) and is parallel to the width direction (x-axis direction) and the longitudinal direction (y-axis direction). The virtual plane SL is not an actual plane.

[0016] The upper inductor 1100 and the lower inductor 1200 each have a coil 1110, 1210 and a core 1120, 1220. The number of turns in the coils 1110, 1210 is N (N is an integer greater than or equal to 1). The number of turns in the coils 1110, 1210 is not limited. FIGS. 1 and 2 illustrate an example in which the number of turns N in the coils 1110, 1210 is 5. The coils 1110, 1210 are arranged, for example, such that the center lines of the coils 1110, 1210 are substantially perpendicular (preferably perpendicular) to the plate surface of the conductor plate M. The coils 1110, 1210 may be electrically connected in series or in parallel. In this case, the AC current flowing through the coils 1110, 1210 is supplied from the same AC power source. The coils 1110, 1210 do not necessarily have to be electrically connected. In this case, the AC currents flowing through coils 1110 and 1210 are AC currents supplied from separate AC power sources. Note that "electrically connected in series" has the same meaning as "series connection," which is commonly used in the field of electric circuits. Also, "electrically connected in parallel" has the same meaning as "parallel connection," which is commonly used in the field of electric circuits. In the following description, "electrically connected in series" will be simply referred to as "series connection" as necessary. Also, "electrically connected in parallel" will be simply referred to as "parallel connection" as necessary.

[0017] The alternating current flowing from the AC power source to coils 1110 and 1210 should cause the magnetic flux generated from coils 1110 and 1210 to have approximately the same (preferably the same) direction at the same time, and should cause the alternating magnetic field generated from coils 1110 and 1210 to intersect approximately perpendicular (preferably perpendicular) to the plate surface of conductor plate M.

[0018] 1, 2A, and 2B, when the coils 1110 and 1210 are connected in series, the total number of turns in the coils 1110 and 1210 in the induction heating device 1000 is 10 (=2×5). On the other hand, when the coils 1110 and 1210 are connected in parallel, the total number of turns in the coils 1110 and 1210 in the induction heating device 1000 is 5.

[0019] 1 to 4 illustrate an example in which the coils 1110, 1210 are formed using copper pipes. The copper pipes have, for example, a hollow rectangular parallelepiped shape. A cooling medium (e.g., cooling water) is supplied to the hollow portion of the copper pipe. For simplicity of notation, as shown in FIGS. 2A and 2B, an example in which the coils 1110, 1210 are formed using spiral copper pipes is illustrated. However, the configuration of the coils 1110, 1220 is not limited to this configuration. The induction heating device 1000 may have coils of a known configuration employed in induction heating devices.

[0020] Coils 1110 and 1210 are disposed (wound) around cores 1120 and 1220, respectively. Cores 1120 and 1220 are made of a soft magnetic material. The volumes of cores 1120 and 1220 differ between the upstream heating region and the downstream heating region. The upstream heating region is a region upstream of reference position SP in the conveying direction (negative side of the y-axis). The downstream heating region is a region downstream of reference position SP in the conveying direction (positive side of the y-axis). In the following description, the upstream side in the conveying direction and the downstream side in the conveying direction will be abbreviated as upstream side and downstream side, respectively, as necessary.

[0021] The reference position SP is the center position in the heating length direction (y-axis direction) between the coil most upstream end position MU and the coil most downstream end position MD. The coil most upstream end position MU is the end position of the coils 1110, 1210 that is located most upstream (negative side of the y-axis) in the heating length direction (y-axis direction). The coil most downstream end position MD is the end position of the coils 1110, 1210 that is located most downstream (positive side of the y-axis) in the heating length direction (y-axis direction).

[0022] 1 , when the number of coils 1110, 1210 arranged in the heating longitudinal direction (y-axis direction) for one core 1120, 1220 is one, the coil most upstream end position MU is the end position of the coil 1110, 1210 that is located most upstream (negative side of the y-axis) in the heating longitudinal direction (y-axis direction) among the end positions of the coil 1110, 1210. Also, the coil most downstream end position MD is the end position of the coil 1110, 1210 that is located most downstream (positive side of the y-axis) in the heating longitudinal direction (y-axis direction) among the end positions of the coil 1110, 1210.

[0023] On the other hand, when multiple coils are arranged side by side with a gap in the heating length direction (y-axis direction) relative to one core 1120, 1220, the coil most upstream end position MU is determined for the coil located most upstream in the heating length direction (negative side of the y-axis) among the multiple coils. That is, the coil most upstream end position MU is the position of the end most upstream in the heating length direction among the ends of the coil located most upstream in the heating length direction. Furthermore, the coil most downstream end position MD is determined for the coil located most downstream in the heating length direction among the multiple coils. That is, the coil most downstream end position MD is the position of the end most downstream in the heating length direction among the ends of the coil located most downstream in the heating length direction.

[0024] As described above, the volume of one core 1120 included in upper inductor 1100 differs between the upstream heating region of the one core 1120 and the downstream heating region of the one core 1120. Similarly, the volume of one core 1220 included in lower inductor 1200 differs between the upstream heating region of the one core 1220 and the downstream heating region of the one core 1220.

[0025] Here, the same main magnetic flux flows through one core 1120 of upper inductor 1100. Similarly, the same main magnetic flux flows through one core 1220 of lower inductor 1200. Fig. 5 is a conceptual diagram showing an example of the main magnetic flux flowing through induction heating device 1000. Note that Fig. 5 shows a simplified configuration of coils 1110 and 1210. Also, hatching indicating a cross section is omitted in Fig. 5.

[0026] The main magnetic flux is a magnetic flux that contributes to heating the conductor plate M. The main magnetic flux is a magnetic flux that passes through the conductor plate M among the magnetic flux generated from the cores 1120 and 1220. The main magnetic flux is approximately perpendicular (preferably perpendicular) to the plate surface of the conductor plate M. As shown in FIG. 5 , the magnetic flux lines φ1 to φ32 that represent the main magnetic flux each have the same start point and end point. In other words, as shown in FIG. 5 , the path (magnetic path) formed by the individual magnetic flux lines φ1 to φ32 is a closed path. FIG. 5 illustrates a case where the path (magnetic path) formed by the magnetic flux lines φ1 to φ32 is a closed path that passes through the core 1120 of the upper inductor 1100, the conductor plate M, and the core 1220 of the lower inductor 1200.

[0027] In upper inductor 1100, the same main magnetic flux flows through core 1120. That is, a path (magnetic path) formed by the same magnetic flux lines φ1 to φ32 exists inside core 1120. Therefore, core 1120 is a single core. Similarly, in lower inductor 1200, the same main magnetic flux flows through core 1220. That is, a path (magnetic path) formed by the same magnetic flux lines φ1 to φ32 exists inside core 1220. Therefore, core 1220 is a single core. FIGS. 1 to 4 illustrate a case where cores 1120 and 1220 are integral with each other. Let us assume that multiple parts forming a core are arranged with a gap between them. When the same main magnetic flux flows through the multiple parts, the core formed by the multiple parts is a single core.

[0028] On the other hand, in upper inductor 1100, a core through which the same main magnetic flux as this main magnetic flux does not flow is not the same core (i.e., a different core). Similarly, in lower inductor 1200, a core through which the same main magnetic flux as this main magnetic flux does not flow is a different core. Furthermore, even if the same main magnetic flux flows through cores, core 1120 of upper inductor 1100 and core 1220 of lower inductor 1200, are different cores.

[0029] As described above, FIGS. 1 to 4 illustrate a case in which the upper inductor 1100 has one core 1120. FIGS. 1 to 4 also illustrate a case in which the volume of the heating downstream region of the core 1120 is larger than the volume of the heating upstream region of the core 1120. Similarly, FIGS. 1 to 4 also illustrate a case in which the lower inductor 1200 has one core 1220. FIGS. 1 to 4 also illustrate a case in which the volume of the heating downstream region of the core 1220 is larger than the volume of the heating upstream region of the core 1220. The reason why the volumes of the heating downstream regions of the cores 1120 and 1220 are made larger than the volumes of the heating upstream regions of the cores 1120 and 1220 is to make the amount of heat generated by the conductor plate M passing through the heating downstream region larger than the amount of heat generated by the conductor plate M passing through the heating upstream region (i.e., the amount of heat generated by the conductor plate M). In the following description, the region with a smaller core volume, either the heating upstream region or the heating downstream region, will be referred to as the "heating amount reduction region" as needed. The region with a larger core volume will be referred to as the "heating amount increase region" as needed. Figures 1 to 4 illustrate a case where the heating upstream region is the heating amount reduction region and the heating downstream region is the heating amount increase region. This is what is meant by the "heating amount reduction region" shown below the heating upstream region and the "heating amount increase region" shown below the heating downstream region in Figures 1, 2A, and 2B.

[0030] 1 to 4 illustrate an example in which the region of the induction heating device 1000 in the heating length direction (y-axis direction) from the coil's most upstream end position MU to the reference position SP is the heating upstream region (heating amount reduction region). Also, FIGS. 1, 2A, and 2B illustrate an example in which the region of the upper inductor 1100 in the heating length direction (y-axis direction) from the reference position SP to the most downstream position CD is the heating downstream region (heating amount increase region). Similarly, FIGS. 1, 2A, and 2B illustrate an example in which the region of the lower inductor 1200 in the heating length direction (y-axis direction) from the reference position SP to the most downstream position CD is the heating downstream region (heating amount increase region). The most downstream position CD is the end position of the upper inductor 1100 or the lower inductor 1200 that is located most downstream in the heating length direction (y-axis direction) (the positive side of the y-axis).

[0031] Contrary to the examples shown in FIGS. 1 to 4 , the volume of the upstream heating region may be larger than the volume of the downstream heating region in one core of the upper inductor. Similarly, the volume of the upstream heating region may be larger than the volume of the downstream heating region in one core of the lower inductor. This is done when the heat generation amount of the conductor plate M passing through the upstream heating region is greater than the heat generation amount of the conductor plate M passing through the downstream heating region (i.e., the heat generation amount of the conductor plate M). In this case, the downstream heating region is the reduced heat generation region, and the upstream heating region is the increased heat generation region. For example, by rotating the induction heating device 1000 shown in FIGS. 1 to 4 180°, an example of an induction heating device is realized in which the core volume of the upstream heating region is larger than that of the downstream heating region. Therefore, illustration of such an induction heating device is omitted. The position of the rotation axis in the heating length direction (y-axis direction) when the induction heating device 1000 shown in FIGS. 1 to 4 is rotated 180° is, for example, the reference position SP. The position of the rotation axis in the width direction (x-axis direction) is, for example, the center position of the cores 1120 and 1220, and the direction in which the rotation axis extends is, for example, the plate thickness direction (z-axis direction).

[0032] As described above, the volumes of the cores 1120, 1220 are made different between the heating upstream region and the heating downstream region. Therefore, the amount of heat generated by the conductor plate M passing through the heating downstream region (i.e., the amount of heat applied to the conductor plate M) can be made different from the amount of heat generated by the conductor plate M passing through the heating upstream region so as to meet the quality requirements for the conductor plate M. This improves the quality of the conductor plate M.

[0033] The degree to which the heat generation amount of the conductor plate M passing through the heating downstream region and the heat generation amount of the conductor plate M passing through the heating upstream region must differ in order to satisfy the quality required of the conductor plate M is determined, for example, based on the results of a simulation experiment or numerical analysis. In the simulation experiment, for example, the conductor plate M is heated using an experimental device that simulates induction heating of the conductor plate M. The quality of the conductor plate M can be confirmed from the conductor plate M after heating. In the numerical analysis, for example, a numerical simulation is performed to simulate induction heating of the conductor plate M. In the numerical simulation, for example, at least one of calculations of the magnetic flux density inside and outside the conductor plate M, calculation of the magnetic properties of the conductor plate M, and calculation of the crystalline structure of the conductor plate M is performed. The quality of the conductor plate M can be confirmed from the results of the numerical simulation.

[0034] The ratio of the volume of the cores 1120, 1220 in the increased heating amount region to the volume of the cores 1120, 1220 in the reduced heating amount region is determined depending on the difference between the amount of heat generated by the conductive plate M passing through the downstream heating area and the amount of heat generated by the conductive plate M passing through the upstream heating area. From the viewpoint of clearly differentiating the quality of the conductive plate M between when such a difference is made and when it is not made, it is preferable that the ratio of the volume of the cores 1120, 1220 in the increased heating amount region to the volume of the cores 1120, 1220 in the reduced heating amount region is 5.1 or more.

[0035] 1 to 4 illustrate an example in which the cores 1120, 1220 each have central legs 1121, 1221, central trunk portions 1122, 1222, end trunk portions 1123, 1223, and end legs 1124, 1224. For convenience of notation and explanation, the central legs 1121, 1221, central trunk portions 1122, 1222, end trunk portions 1123, 1223, and end legs 1124, 1224 are shown by dashed two-dot lines (phantom lines) in FIGS.

[0036] The central legs 1121 and 1221 are disposed in the hollow regions of the coils 1110 and 1210, respectively. FIGS. 1 to 4 illustrate an example in which the central legs 1121 and 1221 are disposed so that the center positions of the central legs 1121 and 1221 in the heating longitudinal direction (y-axis direction) are the reference position SP. The end legs 1124 and 1224 are disposed closer to the increased heating amount region than the coils 1110 and 1210, respectively (on the positive y-axis side in FIGS. 1 to 4 ). The central trunks 1122 and 1222 and the end trunks 1123 and 1223 are disposed closer to the rear side than the coils 1110 and 1210, respectively. The rear side is the side opposite to the side where the conductive plate M is present (i.e., the side where the conductive plate M is not present). The rear side of the upper inductor 1100 is the side where the lower inductor 1200 is not present. The rear side of lower inductor 1200 is the side where upper inductor 1100 is not present. In the example shown in FIGS. 1 to 4 , the rear side of coil 1110 is closer to the positive side of coil 1110 on the z-axis, and the rear side of coil 1210 is closer to the negative side of coil 1210 on the z-axis. Central body portions 1122 and 1222 each include a region closer to the increased heat amount region than central leg portions 1121 and 1221 (the positive side of the y-axis in FIGS. 1 to 4 ). End body portions 1123 and 1223 are positioned closer to the increased heat amount region than central body portions 1122 and 1222 and coils 1110 and 1210, respectively.

[0037] 1 to 4 illustrate an example in which the central legs 1121, 1221, the central trunks 1122, 1222, the end trunks 1123, 1223, and the end legs 1124, 1224 have a rectangular parallelepiped shape. Also, FIGS. 1 to 4 illustrate an example in which the central legs 1121, 1221, the central trunks 1122, 1222, the end trunks 1123, 1223, and the end legs 1124, 1224 have the same length in the width direction (x-axis direction). Also, FIGS. 1 to 4 illustrate an example in which the tip surfaces (end surfaces on the conductive plate M side) of the central legs 1121, 1221 are positioned closer to the conductive plate M than the coils 1110, 1210. 1 to 4 illustrate an example in which the coils 1110, 1210 are positioned closer to the conductor plate M than the tip surfaces of the end legs 1124, 1224. Also, FIGS. 1 to 4 illustrate an example in which the lengths of the central body portions 1122, 1222 and the end body portions 1123, 1223 in the plate thickness direction (z-axis direction) are the same. Also, FIGS. 1 to 4 illustrate an example in which the central body portion 1122 and the end body portion 1123 are magnetically connected to form a single rectangular parallelepiped shape as a whole. Similarly, FIGS. 1 to 4 illustrate an example in which the central body portion 1222 and the end body portion 1223 are magnetically connected to form a single rectangular parallelepiped shape as a whole. Note that being magnetically connected refers to the flow of the same main magnetic flux as the main magnetic flux described above with reference to FIG. 5.

[0038] 1 to 4 illustrate an example in which the central body 1122 is disposed closer to the rear surface than the central leg 1121. Specifically, FIGS. 1 to 4 illustrate an example in which the base end surface (the end surface opposite the conductor plate M) of the central leg 1121 is connected seamlessly to the central body 1122. Therefore, the same main magnetic flux as that flowing through the central body 1122 flows through the central leg 1121. Also, FIGS. 1 to 4 illustrate an example in which the central body 1122 is disposed upstream of the end body 1123. Specifically, FIGS. 1 to 4 illustrate an example in which the downstream end surface of the central body 1122 is connected seamlessly to the upstream end surface of the end body 1123. Therefore, the same main magnetic flux as that flowing through the end body 1123 flows through the central body 1122.

[0039] 1 to 4 illustrate an example in which the end body 1123 is disposed closer to the rear surface than the end leg 1124. Specifically, FIGS. 1 to 4 illustrate an example in which the base end surface of the end leg 1124 is connected seamlessly to the end body 1123. Therefore, the same main magnetic flux flows through the end body 1123 as the main magnetic flux flowing through the end leg 1124. Also, FIGS. 1 to 4 illustrate an example in which the tip surface of the central leg 1121 and the tip surface of the end leg 1124 face the plate surface of the conductor plate M (the surface on the positive side of the z-axis) with a gap therebetween.

[0040] Similarly, an example is shown in which the central body 1222 is disposed closer to the rear surface than the central leg 1221. Specifically, FIGS. 1 to 4 illustrate an example in which the base end surface (the end surface opposite the conductive plate M) of the central leg 1221 is connected seamlessly to the central body 1222. Therefore, the same main magnetic flux as that flowing through the central body 1222 flows through the central leg 1221. Also, FIGS. 1 to 4 illustrate an example in which the central body 1222 is disposed upstream of the end body 1223. Specifically, FIGS. 1 to 4 illustrate an example in which the downstream end surface of the central body 1222 is connected seamlessly to the upstream end surface of the end body 1223. Therefore, the same main magnetic flux as that flowing through the end body 1223 flows through the central body 1222.

[0041] 1 to 4 illustrate an example in which the end-side body portion 1223 is disposed closer to the rear surface than the end-side leg portion 1224. Specifically, FIGS. 1 to 4 illustrate an example in which the base end surface of the end-side leg portion 1224 is connected to the end-side body portion 1223 without a break. Therefore, the same main magnetic flux flows in the end-side body portion 1223 as the main magnetic flux flowing in the end-side leg portion 1224. Also, FIGS. 1 to 4 illustrate an example in which the tip surface of the central leg portion 1221 and the tip surface of the end-side leg portion 1224 face the plate surface of the conductor plate M (the surface on the negative side of the z-axis) with a gap therebetween.

[0042] 1 to 4 illustrate an example in which the positions of the ends in the width direction (x-axis direction) of the central legs 1121, 1221, the central trunk portions 1122, 1222, the end trunk portions 1123, 1223, and the end legs 1124, 1224 are all aligned. That is, Figures 1 to 4 illustrate an example in which the positions of the ends on the positive x-axis direction of the central legs 1121, 1221, the central trunk portions 1122, 1222, the end trunk portions 1123, 1223, and the end legs 1124, 1224 are all aligned. 1 to 4 illustrate an example in which the positions of the ends on the negative x-axis side of the central legs 1121, 1221, central trunks 1122, 1222, end trunks 1123, 1223, and end legs 1124, 1224 are all the same.

[0043] 1 to 4 illustrate an example in which the portions of the cores 1120, 1220 other than the central leg portions 1121, 1221 and the central trunk portions 1122, 1222 are not present in the reduced heat amount region.

[0044] For convenience of explanation, the cores 1120 and 1220 have been described here as being divided into central legs 1121 and 1221, central trunk sections 1122 and 1222, end trunk sections 1123 and 1223, and end legs 1124 and 1224. However, the central legs 1121 and 1221, the central trunk sections 1122 and 1222, the end trunk sections 1123 and 1223, and the end legs 1124 and 1224 are all integral with one another. Therefore, there are no boundaries between the central legs 1121 and 1221, the central trunk sections 1122 and 1222, the end trunk sections 1123 and 1223, and the end legs 1124 and 1224. However, these may be manufactured as separate parts and then combined to form a single core. For example, at least two of the central leg 1121, the central body 1122, the end body 1123, and the end leg 1124 may be arranged with a gap between them, provided that the at least two portions are configured and arranged such that the same main magnetic flux flows through the at least two portions. Similarly, at least two of the central leg 1221, the central body 1222, the end body 1123, 1223, and the end leg 1224 may be arranged with a gap between them, provided that the at least two portions are configured and arranged such that the same main magnetic flux flows through the at least two portions.

[0045] The induction heating device 1000 of this embodiment also has leakage flux reduction members 1140 and 1240. The leakage flux reduction members 1140 and 1240 are arranged to reduce leakage of magnetic flux generated when the cores 1120 and 1220 are excited by AC currents flowing through the coils 1110 and 1210, respectively. The leakage flux is magnetic flux that does not contribute to heating the conductive plate M. The leakage flux is magnetic flux generated from the cores 1120 and 1220 that does not pass through the conductive plate M.

[0046] The leakage flux reduction members 1140, 1240 are arranged in the reduced heat amount region. Figures 1 to 4 illustrate a case where the leakage flux reduction members 1140, 1240 are arranged to face the rear end faces of the coils 1110, 1210 with a gap between them. This embodiment also illustrates a case where the leakage flux reduction members are not arranged in the increased heat amount region. However, the leakage flux reduction members may be arranged in the increased heat amount region.

[0047] 1 to 4 illustrate a case where the leakage flux reduction members 1140 and 1240 are each a single plate. Also, FIGS. 1 to 4 illustrate a case where the widthwise (x-axis) lengths of the leakage flux reduction members 1140 and 1240 are the same as the widthwise lengths of the cores 1120 and 1220, respectively. Also, FIGS. 1 to 4 illustrate a case where the heating longitudinal length (y-axis) lengths of the leakage flux reduction members 1140 and 1240 are the same as the heating longitudinal length lengths of the central body portions 1122 and 1222, respectively. Also, FIGS. 1 to 4 illustrate a case where the positions of the rear surface of the leakage flux reduction members 1140 and 1240 and the rear surface of the cores 1120 and 1220 are aligned (the positions of the surfaces in the z-axis direction are the same). 1 to 4 illustrate a case where the positions of the widthwise end portions of the leakage flux reduction members 1140, 1240 (x-axis direction) are aligned with the positions of the widthwise end portions of the cores 1120, 1220 (the positions of the end portions on the positive and negative sides of the x-axis are the same). Also, FIG. 1 to 4 illustrate a case where the plate surfaces of the plates constituting the leakage flux reduction members 1140, 1240 are approximately parallel (preferably parallel) to the plate surface of the conductor plate M.

[0048] The leakage flux reduction members 1140, 1240 are preferably made of a non-magnetic material in order to reduce leakage of magnetic flux that occurs when the cores 1120, 1220 are excited by an AC current flowing through the coil 1110. Furthermore, in order to suppress heat generation from the induction heating device 1000, the leakage flux reduction members 1140, 1240 are more preferably made of copper, which has high thermal conductivity. This embodiment illustrates a case in which the leakage flux reduction members 1140, 1240 each include a single copper plate. The leakage flux reduction members 1140, 1240 may also be made of, for example, multiple copper plates stacked with their plate surfaces facing each other.

[0049] The induction heating device 1000 of this embodiment also includes intervening members 1130 and 1230. The intervening members 1130 and 1230 are used to position the leakage flux reduction members 1140 and 1240, respectively, and to ensure electrical insulation between the coils 1110 and 1210 and the leakage flux reduction members 1140 and 1240, respectively. The intervening members 1130 and 1230 are disposed between the leakage flux reduction members 1140 and 1240, respectively, and the coils 1110 and 1210, respectively. From the viewpoints of ensuring electrical insulation between the coils 1110 and 1210 and the leakage flux reduction members 1140 and 1240 and reducing the amount of soft magnetic material in the heat reduction region, the intervening members 1130 and 1230 are preferably made of a resin material. Examples of the resin material include glass epoxy resin and phenolic resin. 1 to 4, the interposition members 1130 and 1230 have a rectangular parallelepiped shape with the same size as the space between the leakage magnetic flux reduction members 1140 and 1240 and the coils 1110 and 1210, respectively.

[0050] 1 , in the induction heating device 1000 of this embodiment, the cores 1120, 1220 are not located upstream (in the negative direction of the y-axis) of the central legs 1121, 1221, respectively. Therefore, if the leakage flux reduction members 1140, 1240 were not present, for example, the magnetic flux that emerges from the cores 1120, 1220 downstream (in the negative direction of the y-axis) of the cores 1120, 1220 would likely become leakage magnetic flux that does not pass through the conductor plate M. In contrast, by providing the leakage flux reduction members 1140, 1240, the magnetic flux that emerges from the cores 1120, 1220 downstream of the cores 1120, 1220 (toward the negative y-axis) is more likely to flow toward the conductor plate M than when the leakage flux reduction members 1140, 1240 are not provided (see magnetic flux lines φ19, φ21, φ23, φ25, φ27, φ29, and φ31 shown in FIG. 5 ). Therefore, this magnetic flux is less likely to become leakage flux (i.e., more likely to become main magnetic flux).

[0051] The induction heating device 1000 may have a shield plate (not shown) for preventing overheating of the edge portions (edges in the width direction) of the conductor plate M. For example, the shield plate is disposed between the edge portions of the conductor plate M and the cores 1120, 1220, respectively. The shield plate may also move according to the width of the conductor plate M and the amount of meandering (amount of movement in the width direction) of the conductor plate M. The shield plate is intended to prevent the main magnetic flux from passing through the edge portions of the conductor plate M, and is not intended to reduce leakage magnetic flux.

[0052] Fig. 6A is a diagram conceptually showing an example of the amount of heat generated by a conductor plate M heated using the induction heating device 1000 of this embodiment. Fig. 6B is a diagram conceptually showing an example of the amount of heat generated by a conductor plate M heated using two general induction heating devices as the induction heating device. The two general induction heating devices are arranged with a gap between them in the heating longitudinal direction (x-axis direction).

[0053] In FIG. 6A, P ｍｉｎis the minimum value of the heat generation amount at a certain portion of the conductor plate M while it is passing through the induction heating device 1000. This portion is, for example, the central portion in the width direction (x-axis direction). As shown in FIG. 6A, the heat generation amount at each portion of the conductor plate M while it is passing through the induction heating device 1000 of this embodiment is minimum at the coil's most upstream end position MU. P ｍａｘ is the maximum value of the heat generation amount at a certain portion of the conductor plate M while it is passing through the induction heating device 1000. As shown in Fig. 6A, the heat generation amount at each portion of the conductor plate M while it is passing through the induction heating device 1000 of this embodiment is maximum at the most downstream position CD. Ａ , P Ｂ is the amount of heat generated at a certain portion of the conductive plate M passing through the central legs 1121 and 1221 of the induction heating device 1000.

[0054] As described above, in the induction heating device 1000 of this embodiment, the volume of the heating upstream region and the volume of the heating downstream region are made different in one core 1120, 1220. By adjusting the volume of the heating upstream region and the volume of the heating downstream region, the heat generation amount of each portion of the conductor plate M passing through the central legs 1121, 1221 of the induction heating device 1000 can be calculated as the heat generation amount P Ａ , P Ｂ (This is indicated by the double-headed arrows in FIG. 6A ). Therefore, the heat generation amount of the conductor plate M downstream of the reference position SP (i.e., the heat generation amount for the conductor plate M) can be made different from the heat generation amount of the conductor plate M upstream of the reference position SP. Therefore, it is possible to achieve a difference between the temperature rise rate in the heating longitudinal direction (y-axis direction) in the region upstream of the reference position SP and the temperature rise rate in the heating longitudinal direction in the region downstream of the reference position SP using a single core 1120, 1220. From the above, the quality of the conductor plate M can be adjusted by adjusting the volume of the heating upstream region and the heating downstream region.

[0055] 6B, CU1 represents the most upstream position of the induction heating device located upstream of the two typical induction heating devices. The most upstream position is the end position of the upper inductor or the lower inductor that is located most upstream (negative side of the y-axis) in the heating length direction (y-axis direction). Note that in the induction heating device 1000 of this embodiment, the most upstream coil end position MU and the most upstream position are shown as an example.

[0056] MU1 represents the most upstream end position of the coil of the induction heating device located on the upstream side. SP1 represents the reference position of the induction heating device located on the upstream side. MD1 represents the most downstream end position of the coil of the induction heating device located on the upstream side. CD1 represents the most downstream position of the induction heating device located on the upstream side.

[0057] P １ｍｉｎ is the minimum value of the heat generation amount at a certain portion of the conductor plate M while passing through the induction heating device located upstream of the two general induction heating devices. As shown in FIG. 6B, the heat generation amount at each portion of the conductor plate M while passing through the induction heating device located upstream is minimum at the coil's most upstream position CU1. １ｍａｘ is the maximum value of the heat generation amount at a certain portion of the conductor plate M while it is passing through the induction heating device located on the upstream side. As shown in FIG. 6B, the heat generation amount at each portion of the conductor plate M while it is passing through the induction heating device located on the upstream side is maximum at the most downstream position CD1. Also, in FIG. 6B, P １Ｃ is the amount of heat generated at a certain portion of the conductive plate M passing through the central leg of the induction heating device arranged on the upstream side.

[0058] In a typical induction heating device, the volume of one core is the same in the upstream heating region and the downstream heating region. Therefore, of the two typical induction heating devices, the heat generation amount P of each part of the conductor plate M passing through the central leg of the induction heating device located on the upstream side is １Ｃ is the maximum value P of the heat generation amount at the portion of the conductor plate M passing through the induction heating device arranged on the upstream side. １ｍａｘ The value is fixed at 1 / 2 of the value.

[0059] In addition, in Figure 6B, CU2 represents the most upstream position of the induction heating device located downstream of the two common induction heating devices. MU2 represents the most upstream end position of the coil of the induction heating device located downstream. SP2 represents the reference position of the induction heating device located downstream. MD2 represents the most downstream end position of the coil of the induction heating device located downstream. CD2 represents the most downstream position of the induction heating device located upstream.

[0060] P ２ｍｉｎ is the minimum value of the heat generation amount at a certain portion of the conductor plate M while passing through the induction heating device located downstream of the two common induction heating devices. As shown in FIG. 6B, the heat generation amount at each portion of the conductor plate M while passing through the induction heating device located downstream is minimum at the coil's most upstream position CU2. ２ｍａｘ is the maximum value of the heat generation amount at a certain portion of the conductor plate M while it is passing through the induction heating device located downstream. As shown in FIG. 6B, the heat generation amount at each portion of the conductor plate M while it is passing through the induction heating device located downstream is maximum at the most downstream position CD2. Also, in FIG. 6B, P ２Ｃ is the amount of heat generated at a certain portion of the conductive plate M passing through the central leg of the induction heating device arranged downstream.

[0061] As mentioned above, in a typical induction heating device, the volume of one core is the same in the upstream heating region and the downstream heating region. Therefore, of the two typical induction heating devices, the heat generation amount P of each part of the conductor plate M passing through the central leg of the induction heating device located downstream is ２Ｃ is the maximum value P of the heat generation amount at the portion of the conductor plate M passing through the induction heating device arranged downstream. ２ｍａｘ The value is fixed at 1 / 2 of the value.

[0062] In the induction heating devices described in Patent Documents 1 to 3, the volume of one core is the same in the upstream and downstream heating regions. Therefore, it is only possible to make the heat generation amount of the conductor plate M upstream of the reference positions SP1 and SP2 (i.e., the heat generation amount for the conductor plate M) equal to the heat generation amount of the conductor plate M downstream of the reference positions SP1 and SP2. Furthermore, unless multiple induction heating devices are used, it is impossible to adjust the heat generation amount of the conductor plate M in the heating length direction (y-axis direction). In other words, unless multiple cores are used as the cores of the upper inductor, it is impossible to adjust the heat generation amount of the conductor plate M in the heating length direction (y-axis direction). Similarly, unless multiple cores are used as the cores of the lower inductor, it is impossible to adjust the heat generation amount of the conductor plate M in the heating length direction (y-axis direction). Therefore, compared to the induction heating device 1000 of this embodiment, the time required for the conductor plate M to be heated by the induction heating device is longer. Furthermore, as shown in FIG. 6B , an area where the conductor plate M is not heated is generated between the two induction heating devices. Therefore, there is a risk that the temperature of the conductor plate M will drop while being transported between the two induction heating devices. As a result, there is a risk that the quality required for the conductor plate M will not be met, and there is also a risk that the following disadvantages will occur, for example: a large space must be secured for the installation of the induction heating devices; and installation of multiple induction heating devices will increase costs.

[0063] (Design Method) Next, an example of a design method for the dimensions of the cores 1120, 1220 for configuring an induction heating device that can induction heat a conductor plate so as to satisfy the quality required for the conductor plate will be described. Here, an example will be given of a design method for the dimensions of the cores 1120, 1220 when the upstream heating region is a reduced heating amount region and the downstream heating region is an increased heating amount region.

[0064] The length (mm) of the leakage flux reduction members 1140 and 1240 in the heating longitudinal direction (y-axis direction) is W １ The length (mm) of the central body portions 1122 and 1222 in the heating longitudinal direction (y-axis direction) is defined as W ２ (>W １ The length (mm) of the end-side body portions 1123 and 1223 in the heating longitudinal direction (y-axis direction) is W３ The length (mm) of the end leg portions 1124 and 1224 in the plate thickness direction (z-axis direction) is W ４ The length (mm) of the region of the central leg portions 1121 and 1221 that protrudes from the tip end surfaces of the coils 1110 and 1210 toward the conductive plate M in the plate thickness direction (z-axis direction) is defined as W ５ In addition, W shown in Figs. １ ~W ５ represents their lengths.

[0065] Furthermore, when focusing on a certain region of the conductive plate M, the heat generation ratio (%) of that region is P (P １ ~P ４ ) The heat generation ratio P of a certain portion of the conductor plate M is the ratio, expressed as a percentage, of the heat generation amount of the portion when the portion passes through the induction heating device 1000 (the heating upstream region and the heating downstream region) to the heat generation amount of the portion when the portion passes through the heating upstream region. In the example shown in FIG. 6A, the heat generation ratio P is P Ａ ÷P ｍａｘ x100 and P Ｂ ÷P ｍａｘ It is expressed as x100.

[0066] The inventors of the present invention １ ~W ５ The core was configured with different combinations of values, and a numerical analysis was performed on the induction heating device, and the heat generation ratio P for each combination was calculated. １ ~W ５ The conditions other than the numerical values ​​are the same. １ ~P ４ , W １ ~W ５ The numerical value given as ∑ is 0 (zero) or a positive value. １ is 0 (zero) or a negative value.

[0067] First, W １ and W ２ P, which is the heat generation ratio P when only １ was calculated by numerical analysis. １ and W ２ When changing２ >W １ The condition of W is satisfied. １ +W ２ With a constant value, W is １ When shortening W, a part of the region of the intervening members 1130, 1230 and the leakage magnetic flux reduction members 1140, 1240 shown in FIG. 1 on the side of the increased heat amount region (the positive direction side of the y axis in FIG. 1) is considered to be the region of the core 1120. ２ That is, the central body portions 1122 and 1222 are extended toward the heating amount reduction region (negative direction of the y-axis in FIG. 1). However, the coil most upstream end position MU is not changed. And, from the results of the numerical analysis, P １ And, W １ and W ２ A regression equation (regression coefficient and constant) showing the relationship between P was calculated by regression analysis. As a result, as shown in the following equation (1), １ , W / (W １ +W ２ ) function, the results of the numerical analysis could be reproduced well. １ The larger the value of P １ becomes smaller. Note that equation (1) is W1 / (W １ +W ２ ) is a simple regression equation with explanatory variables.

[0068]

[0069] Next, W １ and W ２ In addition to W ３ P, which is the heat generation ratio P when ２ was calculated by numerical analysis. From the results of the numerical analysis, P ２ And, W １ , W ２ , and W ３ As a regression equation showing the relationship between １ As a result, as shown in the following equation (2), P １ From W ３ / (W ２ +W ３ ) function f(W ３ / (W ２ +W ３ ) is subtracted from P ２ By expressing W in equation (2), the results of the numerical analysis could be reproduced well. ３ The larger the value of P ２ The function f(W ３ / (W ２ +W ３ ) is a function f(W ３ / W ２ +W ３ ) is added to the heat generated in each area of ​​the conductor plate M. １ / (W １ +W ２ ) and W ３ / (W ２ +W ３ ) is a multiple regression equation with explanatory variables.

[0070]

[0071] Next, W １ , W ２ , and W ３ In addition to W ４ The calorific value ratio P4 when W is changed was calculated by numerical analysis. １ , W ２ , W ３ , and W ４ As a regression equation showing the relationship between ２ As a result, as shown in the following equation (3), P ２ From W ４ Function f(W ４ ) is subtracted from P ３ By expressing W in equation (3), the results of the numerical analysis could be reproduced well. ４ The larger the value of P ３ The function f(W ４) is greater in the downstream heating region (region where the amount of heat is increased) when the end legs 1124 and 1224 are present than when the end legs 1124 and 1224 are not present. ４ ) and each area of ​​the conductor plate M generates heat by W １ / (W １ +W ２ ), W ３ / (W ２ +W ３ ), and W ４ is a multiple regression equation with the following as explanatory variables.

[0072]

[0073] Finally, W １ , W ２ , W ３ , W ４ , and W ５ The heat generation ratio P when ４ was calculated by numerical analysis. From the results of the numerical analysis, P and W １ , W ２ , W ３ , W ４ , and W ５ As a regression equation showing the relationship between ３ As a result, as shown in the following equation (4), P ３ To, W ５ Function f(W ５ ) is added to the formula P ４ By expressing W in equation (4), the results of the numerical analysis could be reproduced well. ５ The larger the value of P ４ The function f(W ５ ) is greater in the heating upstream region (heat amount reduction region) when the central legs 1121, 1221 protrude toward the conductor plate M than when they do not protrude beyond the tip surfaces of the coils 1110, 1210. ５ ) more heat is generated in each area of ​​the conductor plate M. １ / (W １ +W ２ ), W ３ / (W ２ +W３ ), W ４ , and W ５ is a multiple regression equation with the following as explanatory variables.

[0074]

[0075] Based on the quality required for the conductor plate M to be heated, ４ is determined, and W is set to satisfy equations (1) to (4). １ , W ２ , W ３ , W ４ , and W ５ If you select １ , W ２ , W ３ , W ４ , and W ５ It is possible to design １ , W ３ , W ４ and W ５ At least one of the W may be 0 (zero). １ When W is 0 (zero), it means that the interposition members 1130, 1230 and the leakage magnetic flux reduction members 1140, 1240 are not disposed. ３ When W is 0 (zero), it means that the end body portions 1123, 1223 and the end leg portions 1124, 1224 are not arranged. ４ When W is 0 (zero), it means that the end legs 1124 and 1224 are not arranged. ２ never becomes 0 (zero).

[0076] As mentioned above, P ４ is determined based on the results of, for example, a simulation experiment or a numerical analysis. When a simulation experiment is performed, for example, the conductor plate is heated by induction heating or other methods with different heat input amounts in a region corresponding to the reduced heat amount region and a region corresponding to the increased heat amount region. By checking the quality of the conductor plate after heating, it is confirmed whether or not it satisfies the quality required for the conductor plate. In this case, P is calculated using the heat input amount when the quality required for the conductor plate is satisfied. ４is determined. When performing numerical analysis, for example, the crystal structure and magnetic properties of the conductor plate are calculated when the conductor plate is induction heated by differentiating the heat input between the region corresponding to the reduced heat amount region and the region corresponding to the increased heat amount region. In addition, in the numerical analysis, evaluation indexes for the crystal structure and magnetic properties of the conductor plate may be calculated. In this case, if the calculated result satisfies the quality required for the conductor plate, the heat input at that time is used to calculate P ４ is determined.

[0077] (Other Embodiments) The above-described embodiments of the present invention are merely examples of specific embodiments for carrying out the present invention, and the technical scope of the present invention should not be construed as being limited by these. In other words, the present invention can be embodied in various forms without departing from its technical concept or main features.

[0078] The present invention can be used, for example, to heat a conductive plate.

Claims

1. The inductor has an upper inductor and a lower inductor that are arranged to face each other with a conductor plate therebetween, A transverse type induction heating device that inductively heats a conductor plate by crossing an alternating magnetic field on a plate surface of the conductor plate, Each of the upper inductor and the lower inductor has a coil and a core, a volume of the one core included in the upper inductor and a volume of the one core included in the lower inductor are different between a heating upstream region of the one core and a heating downstream region of the one core, the heating upstream region of the core is a region upstream of a reference position of the core in a transport direction of the conductor plate, the heating downstream region of the core is a region downstream of a reference position of the core in a transport direction of the conductor plate, The reference position of the core is a central position in the heating length direction between the most upstream end position of the coil of the core and the most downstream end position of the coil of the core, The heating length direction is a direction parallel to the conveying direction of the conductor plate, The most upstream end position of the coil of the core is a position of an end portion of the coil arranged with respect to the core, the end portion being located most upstream in the heating length direction, The most downstream end position of the coil of the core is a position of an end portion of the coil arranged relative to the core, the end portion being located most downstream in the heating length direction, The same main magnetic flux flows through one of the cores of the upper inductor, The same main magnetic flux flows through one of the cores of the lower inductor, A transverse type induction heating device, wherein the main magnetic flux is a magnetic flux that passes through the conductor plate.

2. Each of the upper inductor and the lower inductor has a leakage flux reducing member for reducing leakage flux, the leakage flux includes a magnetic flux generated from the core that does not pass through the conductive plate, The leakage magnetic flux reducing member is disposed in a heat amount reducing region, 2. The transverse type induction heating device according to claim 1, wherein the reduced heating area is one of the upstream heating area and the downstream heating area, the area having a smaller core volume.

3. The transverse type induction heating device according to claim 2 , wherein the leakage magnetic flux reducing member comprises a non-magnetic material.

4. The transverse type induction heating device according to claim 3 , wherein the leakage flux reducing member comprises copper.

5. The leakage magnetic flux reducing member is not disposed in the heat increase area, The transverse type induction heating device according to any one of claims 2 to 4, wherein the increased heat amount region is one of the upstream heating region and the downstream heating region, whichever region has a larger volume of the core.

6. the leakage flux reduction member is disposed on the rear side of the coil, 5. The transverse type induction heating device according to claim 2, wherein the rear surface side is opposite to the side where the conductive plate is present.

7. The transverse type induction heating device according to any one of claims 2 to 4, wherein each of the upper inductor and the lower inductor has an intervening member for electrically insulating the leakage flux reduction member and the coil.

8. The leakage magnetic flux reduction member has one or more plates, 5. The transverse type induction heating device according to claim 2, wherein a surface of the plate is substantially parallel to a surface of the conductor plate.

9. a ratio of the volume of the core in the increased heating region to the volume of the core in the reduced heating region is 5.1 or greater; the heating amount reduction region is one of the heating upstream region and the heating downstream region, which has a smaller volume of the core; The transverse type induction heating device according to any one of claims 1 to 4, wherein the increased heat amount region is one of the upstream heating region and the downstream heating region, whichever region has a larger volume of the core.

10. The core is A central leg portion disposed in a hollow region of the coil; a central body portion through which a main magnetic flux flows that is the same as a main magnetic flux flowing in the central leg portion, a tip end surface of the central leg portion faces the conductive plate with a gap therebetween; The central body portion includes a region closer to the increased heat amount region than the central leg portion, the increased heating amount region is one of the heating upstream region and the heating downstream region, which has a larger volume of the core; The central body portion is disposed on the rear side of the coil, 5. The transverse type induction heating device according to claim 1, wherein the rear surface side is opposite to the side where the conductive plate is present.

11. Each of the upper inductor and the lower inductor has a leakage flux reducing member for reducing leakage flux, the leakage flux includes a magnetic flux generated from the core that does not pass through the conductive plate, The leakage magnetic flux reducing member is disposed in a heat amount reducing region, the heating amount reduction region is one of the heating upstream region and the heating downstream region, which has a smaller volume of the core; The transverse type induction heating device according to claim 10 , wherein a length of the central body portion in the heating length direction is longer than a length of the leakage magnetic flux reduction member in the heating length direction.

12. the core has an end-side body portion through which a main magnetic flux flows that is the same as a main magnetic flux flowing in the central body portion, 11. The transverse type induction heating device according to claim 10, wherein the end side body portion is disposed closer to the rear surface than the coil, and closer to the increased heat amount region than the central leg portion and the coil.

13. The core is a leg portion through which the same main magnetic flux as that flowing in the body portion flows; the end leg portion is disposed closer to the increased heat amount region than the central body portion and the coil, and is disposed closer to the conductor plate than the end body portion; The transverse type induction heating device according to claim 12 , wherein a tip surface of the end leg portion faces the conductive plate with a gap therebetween.

14. The transverse type induction heating device according to claim 13 , wherein the coil is disposed closer to the conductor plate than the tip faces of the end legs.

15. A portion of the core other than the central leg portion and the central body portion is not present in a heat amount reduction region, 11. The transverse type induction heating device according to claim 10, wherein the reduced heating amount region is one of the upstream heating region and the downstream heating region, the region having a smaller volume of the core.

16. 5. The transverse type induction heating device according to claim 1, wherein the volume of the core in the heating downstream region is larger than the volume of the core in the heating upstream region.