JP2006310144A - Induction heating device and heating deterrence method by leakage flux of high-frequency current - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating device aimed at uniformalizing temperature distribution of a heated object in induction heating the same. <P>SOLUTION: The induction heating device for heating a heated object by inducing overcurrent to the heated object by supplying induction coils with high-frequency current is so made to reverse a direction of current by crossing more than once the induction coils and power-feeding sites where high-frequency current is supplied to the induction coil, whereby, the induction coils can be arranged in opposition to each other with a given interval, at which time, the crossing sites of the induction coils arranged in opposition with the given interval are to be arranged in opposition to each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an induction heating device and a heating suppression method using high-frequency current leakage magnetic flux. More specifically, the present invention relates to an object to be heated having a plate-like shape (in the present specification, “a workpiece having a plate-like shape”). The “heated object” is simply referred to as “a plate-shaped object to be heated” as appropriate.) And the like, and the like is used to suppress the surrounding structure from being heated by a suitable induction heating device and high-frequency current leakage magnetic flux. The present invention relates to a heating suppression method using leakage magnetic flux of high frequency current.

  Conventionally, when heating an object to be heated having various shapes, for example, a plate-shaped object to be heated, generally, the object to be heated is a non-magnetic material such as aluminum or stainless steel or a magnetic material whose Curie point temperature is exceeded. In the case of a material, an induction heating apparatus having a structure (transverse structure) in which induction coils are arranged above and below the object to be heated (in an induction heating apparatus having a transverse structure, When the magnetic material generated by the induction coil arranged in is passed through the object to be heated, the object to be heated is heated.), And when the object to be heated is a magnetic material, 2. Description of the Related Art An induction heating device having a structure in which an induction coil is disposed only on one side of a heated object (pancake type structure) or a structure that allows a heated object to pass through a toroidal interior (tunnel structure) is used.

Here, FIG. 1 (a) shows a conceptual configuration explanatory diagram of a conventional induction heating apparatus having the above-described transverse structure, and FIG. 1 (b) shows a diagram of FIG. 1 (a). An arrow A conceptual structure explanatory drawing is shown.

  That is, the induction heating apparatus 10 having a transverse structure is supplied with a high-frequency current from the high-frequency oscillator via a feeder 12 that is a line for conducting a high-frequency current generated by a high-frequency oscillator (not shown). 1 induction coil 14 and a second induction coil 18 to which a high-frequency current is supplied from the high-frequency oscillator via a feeder 16 that is a line for conducting a high-frequency current generated by the high-frequency oscillator.

  The first induction coil 14 and the second induction coil 18 are spaced apart from each other so as to form a predetermined gap g and are opposed to each other, and the plate-like object to be heated 20 is inserted into the gap g. Can be moved.

  In the above configuration, when a high frequency current is supplied from the high frequency oscillator to the first induction coil 14 and the second induction coil 18 of the induction heating device 10 via the feeders 12 and 16, the first induction coil 14 and the second induction coil 14. The magnetic flux generated by the coil 18 penetrates the plate-like heated object 20 located in the gap g, and an eddy current is induced in the plate-like heated object 20, whereby the heated object 20 is heated.

By the way, when the plate-like object to be heated 20 is heated by the induction heating device 10, when the width W ₁ of the plate-like object to be heated 20 is narrower than the width W _{2 of} the first induction coil 14 and the second induction coil 18, That is, when the width W _{2 of} the first induction coil 14 and the second induction coil 18 is larger than the width W ₁ of the plate-like heated object 20, eddy currents flowing over the entire surface of the plate-like heated object 20 are It flows to the edges 20a, 20b which are both ends in the width direction of the plate-like heated object 20, and the edges 20a, 20b of the plate-like heated object 20 show a specific temperature rise, In FIG. 5, only the temperatures of the edges 20a and 20b are abnormally higher than those in other regions.

  Thus, there is a problem that the temperature distribution of the plate-like heated object 20 deteriorates as shown in FIG. 2 due to the occurrence of an abnormally high temperature region in the plate-like heated object 20. According to the experience of the present inventor, the temperature of the edges 20a and 20b of the plate-like object to be heated 20 may be as high as 100 ° C. or more as compared with other regions as shown in FIG.

  In addition, there is a problem with the induction heating apparatus having the above-described transverse type structure, that is, an abnormally high temperature region is generated at the edges as both ends in the width direction of the plate-shaped object to be heated. The problem that the temperature distribution of the above becomes worse as shown in FIG. 2 has also been pointed out in the induction heating apparatus having the pancake type structure.

Note that the cause of the above-described problems is that vortices generated on the surface of the plate-shaped object to be heated 20 when a high-frequency current flows through induction coils such as the first induction coil 14 and the second induction coil 18. This is because the current I _E (in FIG. 1, the eddy current I _E is indicated by a one-dot chain line) draws a large loop, and a large loop current is generated on the surface of the plate-shaped object 20 to be heated. (See FIG. 1 (b)).

On the other hand, in a line through which a high-frequency current flows, such as a feeder used to supply a high-frequency current from a high-frequency oscillator to an induction coil or the like, leakage from the line occurs when the line is incorporated in various devices. There is a problem that current flows through the structure located around the line due to the magnetic flux, and the structure located around the line generates heat.

  For this reason, conventionally, by adopting a coaxial structure for the line through which such a high-frequency current flows, leakage flux from the line is reduced by confining the magnetic flux inside, or a copper pipe is used as the line. While being used, a copper plate is wound around the structure, and a magnetic flux is canceled by passing a current in the opposite direction to the copper pipe to the copper plate, thereby suppressing heat generation of the structure.

  However, in the method of suppressing the heat generation of the structure according to the above-described conventional technology, it is necessary to adopt a complicated coaxial structure for the line or to wind a current by winding a copper plate around the structure. It has been pointed out a new problem of increasing complexity and incurring high costs.

Note that the prior art that the applicant of the present application knows at the time of filing a patent application is not an invention related to a known literature invention, so there is no prior art document information to be described.

  The present invention has been made in view of the various problems of the prior art as described above, and the object of the present invention is to provide a temperature distribution of the object to be heated when induction heating is performed. It is an object of the present invention to provide an induction heating apparatus that can achieve uniformization.

  Further, the object of the present invention is to suppress the heat generation of the structure located in the periphery of the line due to the leakage magnetic flux from the line through which the high-frequency current flows without incurring high cost by a simple configuration. An object of the present invention is to provide a heating suppression method using high-frequency current leakage magnetic flux.

  In order to achieve the above object, an induction heating device according to the present invention is configured such that when a series of induction coils are arranged, a crossing portion that changes the direction of an eddy current generated in an object to be heated is connected to the induction coil or the induction coil with a high-frequency current. Is formed in a power feeding part to reduce the loop of eddy current that deteriorates the temperature distribution of the object to be heated, and thereby the temperature distribution of the object to be heated is made uniform. .

  Further, in order to achieve the above object, the heating suppression method by the high-frequency current leakage magnetic flux according to the present invention is such that when the line through which the high-frequency current flows is arranged inside the apparatus, the current direction is opposite in the extension direction of the line. The line forms an intersection so that the current flowing to the structure located around the line due to the leakage magnetic flux from the line cancels out the current, making it difficult for the current to flow through the structure. Thus, heat generation of the structure is suppressed.

That is, the invention according to claim 1 of the present invention is an induction heating apparatus for heating an object to be heated by inducing an eddy current in the object to be heated by supplying a high frequency current to the induction coil. Alternatively, the feeding portions that supply high-frequency current to the induction coil are crossed at least once to reverse the direction of the current.

  The invention according to claim 1 of the present invention is the invention according to claim 2 of the present invention, wherein the induction coils are arranged to face each other with a predetermined gap therebetween, and the predetermined gap is opened. The crossing portions of the induction coils arranged opposite to each other are arranged to face each other.

  According to a third aspect of the present invention, in the invention according to the first or second aspect of the present invention, the induction coil is disposed on a magnetic member, and the magnetic member is predetermined. The crossing portion of the induction coil is arranged at the position.

  According to a fourth aspect of the present invention, in the invention according to any one of the first, second, and third aspects of the present invention, the induction coil is disposed in a tubular insulating member. These are cooled by the cooling water supplied into the tubular insulating member.

  In the invention according to claim 5 of the present invention, the surface of the structure adjacent to the line is prevented from being heated by the leakage magnetic flux of the high-frequency current flowing through the line arranged inside the structure. In the method of suppressing heating due to the leakage magnetic flux of the high-frequency current, when the line through which the high-frequency current flows is arranged in the structure, the line is arranged in the structure so that the current direction is opposite in the extension direction of the line. Forming a crossing part, canceling out the current flowing to the structure located around the line due to the leakage magnetic flux from the line, making it difficult for the current to flow, and generating heat of the structure It is intended to be deterred.

  Since the induction heating apparatus according to the present invention is configured as described above, when the object to be heated is induction heated, the temperature distribution of the object to be heated can be made uniform. Play.

  In addition, since the heating suppression method using the high-frequency current leakage magnetic flux according to the present invention is configured as described above, the high-frequency current leakage flux from the wiring through which the high-frequency current flows without incurring high costs with a simple configuration. There is an excellent effect that it is possible to suppress the heat generation of the structure located around the wiring.

  Hereinafter, an example of an embodiment of an induction heating apparatus according to the present invention and a heating suppression method using high-frequency current leakage magnetic flux will be described in detail with reference to the accompanying drawings.

  In the following description, the same or corresponding components in each embodiment will be denoted by the same reference numerals, and detailed description of the configuration and operation will be omitted as appropriate.

First, FIGS. 3 (a) and 3 (b) are explanatory diagrams of the configuration of the first embodiment of the induction heating apparatus according to the present invention. Here, FIG. 3A shows a schematic sectional view taken along line BB in FIG. 3B, and shows a sectional view corresponding to FIG. FIG. 3B is a schematic cross-sectional view taken along line CC in FIG. 3A, and shows a cross-sectional view corresponding to FIG.

  The induction heating apparatus 100 according to the first embodiment has a pancake type structure, and has one terminal (not shown) of a high-frequency oscillator (not shown) that generates a high-frequency current. A feeder 102 that is a line that conducts a high-frequency current connected to the other end 102a, and a feeder 104 that is a line that conducts a high-frequency current connected to one end 104a to the other terminal (not shown) of the high-frequency oscillator. A series of induction coils 106 having one end 106 a connected to the other end 102 b of the feeder 102 and the other end 106 b connected to the other end 104 b of the feeder 104, and the induction coil 106 are disposed. And a U-shaped ferrite core 108 as a magnetic member.

  Here, the induction coil 106 is disposed so as to intersect at least once in order to reverse the direction of the eddy current generated on the surface of the plate-shaped object 110. Specifically, the induction coil 106 in the induction heating apparatus 100 intersects three times as shown in FIGS. 3A and 3B, and three intersecting portions 106c are formed.

  More specifically, when arranging a series of induction coils 106 for inductively heating the plate-shaped object 110 on the U-shaped ferrite core 108, end portions 108 a and end portions of the U-shaped ferrite core 108 that are adjacent to each other. The induction coil 106 intersects with 108a to form an intersection 106c.

In the above-described configuration, in this induction heating apparatus 100, when the series of induction coils 106 are arranged, three intersecting portions 106c are provided, so that the high-frequency current flowing through the induction coil 106 as shown in FIG. I _H comes to draw a small loop, and along with this, an eddy current I _E flowing on the surface of the plate-shaped object 110 (in FIG. 4, the eddy current I _E is indicated by a one-dot chain line) is also a small loop. Thus, the generation of a large loop current due to the eddy current _IE is prevented. The directions of the small loop eddy currents _IE are opposite to each other with respect to the eddy currents _IE adjacent to each other.

  For this reason, the temperature of the edges 110a and 110b, which are both ends in the width direction in the plate-like heated object 110, does not become abnormally high compared to other regions, so the temperature distribution of the plate-like heated object 110 is deteriorated. Thus, the temperature distribution of the plate-like object to be heated 110 can be maintained in a good state.

Next, FIG. 5 shows a configuration explanatory diagram of a second embodiment of the induction heating apparatus according to the present invention. The configuration explanatory diagram shown in FIG. 5 corresponds to the configuration explanatory diagram shown in FIG.

  The induction heating apparatus 200 of the second embodiment differs from the induction heating apparatus 100 of the first embodiment only in that the U-shaped ferrite core 108 is not provided.

  The induction coil 106 in the induction heating apparatus 200 is arranged so as to intersect once in order to reverse the direction of the eddy current generated on the surface of the plate-shaped object 110, and one intersection 106c is formed. Is formed.

In this induction heating apparatus 200 as well, as in the induction heating apparatus 100 of the first embodiment described above, the high-frequency current flowing through the induction coil 106 draws a small loop, and accompanying this, the plate-shaped object to be heated The eddy current I _E flowing on the surface of 110 (in FIG. 5, the eddy current I _E is indicated by a one-dot chain line) also draws a small loop, which prevents generation of a large loop current by the eddy current I _E. The The two eddy currents _IE in this small loop are opposite to each other.

  For this reason, since the temperature of both edges 110a and 110b in the width direction in the plate-like heated object 110 does not increase, the temperature distribution of the plate-like heated object 110 is not deteriorated, and the plate-like heated object is not made. The temperature distribution of 110 can be maintained in a good state.

Next, FIG. 6 shows a configuration explanatory view of a third embodiment of the induction heating apparatus according to the present invention. The configuration explanatory diagram shown in FIG. 6 corresponds to the configuration explanatory diagram shown in FIG.

  The induction heating apparatus 300 according to the third embodiment has a transverse structure, and the pair of induction heating apparatuses 100 according to the first embodiment described above opens a predetermined gap G and opens the U. It arrange | positions so that the edge part 108a of the letter-shaped ferrite core 108 may be made to oppose.

  In this induction device 300, the pair of induction coils 106 are arranged so that all overlap, including the intersection 106c, as viewed in the direction of arrow D.

  The direction of the high-frequency current supplied to the pair of induction coils 106 is set so that the magnetic circuits M formed on the pair of U-shaped ferrite cores 108 arranged to face each other are formed in the same direction. Yes.

  Also in this induction heating apparatus 300, like the induction heating apparatus 100 of the first embodiment described above, the high-frequency current flowing through the induction coil 106 draws a small loop, and accordingly, the plate-shaped object to be heated The eddy current flowing on the surface of 110 also draws a small loop, and generation of a large loop current due to the eddy current is prevented. For this reason, since the temperature of both edges 110a and 110b in the width direction in the plate-like heated object 110 does not increase, the temperature distribution of the plate-like heated object 110 is not deteriorated, and the plate-like heated object is not made. The temperature distribution of 110 can be maintained in a good state.

Next, FIG. 7 shows a configuration explanatory view of a fourth embodiment of the induction heating apparatus according to the present invention. Here, FIG. 7 corresponds to the configuration explanatory diagram shown in FIG.

  In the induction heating apparatus 400 of the fourth embodiment, a core 402 is formed by combining a plurality of magnetic bodies 402a as magnetic members, and a plurality of the cores 402 are arranged. And the induction coil 106 is arrange | positioned so that it may cross | intersect between each core 402, and the intersection part 106c may be formed.

  In this induction heating apparatus 400, the same effects as those of the induction heating apparatuses 100, 200, and 300 described above can be achieved. However, in the induction heating apparatus 400, the plate-like object 110 is extended in the width direction. As described above, since the core 402 is formed by combining the plurality of magnetic bodies 402a, it is preferable to use it when the plate-shaped object 110 having a wide width W is heated uniformly.

Here, the position of the intersection where the induction coil 106 intersects is not limited to the position shown in the induction heating devices 100, 200, 300, and 400. For example, as shown in FIGS. Such a position may be used.

  That is, FIG. 8 (a) shows an explanatory diagram of a fifth embodiment of the induction heating apparatus according to the present invention, and FIG. 8 (b) shows a sixth embodiment of the induction heating apparatus according to the present invention. The structure explanatory drawing of this form is shown. Here, FIG. 8A and FIG. 8B correspond to the configuration explanatory diagram shown in FIG.

In the induction heating apparatus 500 of the fifth embodiment shown in FIG. 8A, the intersection 106c is formed so that the induction coil 106 forms an independent loop portion 106d, 106e side by side in the vertical direction on the paper surface. Is formed. In this induction heating apparatus 500, the directions of the eddy current _IE generated by the loop portion 106d and the loop portion 106e (in FIG. 8A, the eddy current _IE is indicated by a one-dot chain line) are opposite to each other. It is made to become.

In addition, in the induction heating device 600 of the sixth embodiment shown in FIG. 8B, the crossing portion is formed so that the induction coil 106 forms a loop portion 106f, 106g that is independent from each other in the horizontal direction on the paper surface. 106c is formed. In this induction heating apparatus 600, the directions of the eddy current _IE generated by the loop portion 106f and the loop 106portion g (in FIG. 8B, the eddy current _IE is indicated by a one-dot chain line) are opposite to each other. It is designed to be oriented.

In addition, in the induction heating devices 100, 200, 300, 400, 500, and 600 described above, when it is desired to cool the induction coil 106, for example, the configuration shown in FIG.

  In other words, the induction coil 106 may be disposed on the inner diameter side of the tubular insulating member 700 and the induction coil 106 may be cooled by supplying cooling water into the tubular insulating member 700.

Next, a method for suppressing heating by high-frequency current leakage magnetic flux according to the present invention will be described. For comparison, first, the arrangement of a conventional line for supplying high-frequency current will be described.

  FIG. 10 shows an arrangement of a conventional line for supplying a high-frequency current, but lines 802 and 804 are arranged in parallel in a structure 800 such as a device.

  Here, when a high-frequency current is passed through the lines 802 and 804, current flows on the surface of the structure 800 adjacent to the lines 802 and 804, and the structure 800 generates heat. Specifically, on the surface of the structure 800 to which the line 802 is adjacent, a current in the direction of the dashed arrow E opposite to the direction of the high-frequency current flowing in the line 802 flows, and the structure 800 to which the line 804 is adjacent The structure 800 generates heat when a current in the direction of the broken line arrow F opposite to the direction of the high-frequency current flowing in the line 804 flows on the surface.

  On the other hand, FIG. 11 shows the arrangement of lines through which a high-frequency current is passed in order to implement the heating suppression method using the high-frequency current leakage magnetic flux according to the present invention. The line 802 and the line 804 in the structure 800 are shown in FIG. Arrange so that they intersect. More specifically, the line 802 and the line 804 are crossed in the structure so that the current direction is reversed in the extending direction of the lines 802 and 804.

  Here, when a high-frequency current is passed through the lines 802 and 804, a current in the direction of a broken line arrow E opposite to the direction of the high-frequency current flowing in the line 802 flows on the surface of the structure 800 adjacent to the line 802, On the surface of the structure 800 adjacent to the line 804, a current in the direction of the broken line arrow F opposite to the direction of the high-frequency current flowing in the line 804 flows.

  At this time, since the line 802 and the line 804 intersect in the structure 800, both the line 802 and the line 804 are adjacent to each other on the surface of the area 800a of the structure 800. Currents in the directions of broken arrows E and F, which are currents in opposite directions, flow on the surface. That is, currents flowing in opposite directions flow on the surface of the region 800a of the structure 800 where the lines 802 and 804 face each other. Therefore, the current flowing on the surface of the region 800a is canceled out, and it becomes difficult for the current to flow in the region 800a. For this reason, the heat_generation | fever of the area | region 800a can be suppressed.

  Similarly, since the line 802 and the line 804 intersect in the structure 800, both the line 802 and the line 804 are adjacent to each other on the surface of the area 800b of the structure 800. Currents in the directions of broken arrows E and F, which are currents in opposite directions, flow on the surface. That is, currents flowing in opposite directions flow on the surface of the region 800b of the structure 800 where the lines 802 and 804 are opposed to each other. Therefore, the current flowing on the surface of the region 800b is canceled out, and it is difficult for the current to flow in the region 800b. For this reason, the heat_generation | fever of the area | region 800a can be suppressed.

The above-described embodiment can be modified as shown in the following (1) to (5).

  (1) In the present invention, the number of times that the induction coil or line intersects is not particularly limited, and may be appropriately selected according to the shape and material of the induction coil or line or the size of the region in which each is disposed. That's fine.

  (2) In the above-described embodiment, the induction heating device provided with a magnetic member such as a ferrite core and the induction heating device not provided with a magnetic member such as a ferrite core are shown. May include a magnetic member such as a ferrite core, or may not include a magnetic member such as a ferrite core.

  (3) In the above-described embodiment, the induction heating apparatus provided with the U-shaped ferrite core has been described. However, the shape of the ferrite core is not limited to the U-shape, for example, A ferrite core having various shapes such as an E shape or an I shape may be used.

  (4) In the fifth embodiment and the sixth embodiment described above, the induction coils are crossed. However, the present invention is not limited to this, and a high frequency current is applied to the induction coils. Feeding sites such as lines for feeders and the like may be crossed, and in this case, the same effects can be obtained. That is, in the fifth embodiment and the sixth embodiment, the induction coil 106 has only the loop portions 106d, 106e, 106e, 106f and the vicinity thereof, and the other conductive portions are like lines such as feeders. What is necessary is just to comprise by a feeding part and to cross | intersect such a feeding part.

  (5) You may make it combine suitably the embodiment shown above and the modification shown in said (1)-(4).

  The present invention is suitable for designing an induction heating device having a transverse structure or a pancake structure for heating various objects to be heated, such as a plate-shaped object to be heated, or from an induction power device to an induction coil of an induction heating device. It can be used when wiring a feeder or the like for supplying a high-frequency current.

FIG. 1A is a conceptual configuration explanatory diagram of a conventional induction heating apparatus having a transverse structure, and FIG. 1B is a conceptual configuration explanatory diagram viewed from an arrow A in FIG. is there. FIG. 2 is a graph showing a characteristic curve of the temperature distribution of the plate-shaped heated object when the plate-shaped heated object is heated by a conventional transverse induction heating apparatus. 3 (a) and 3 (b) are explanatory views of the configuration of the first embodiment of the induction heating apparatus according to the present invention, and FIG. 3 (a) is a schematic configuration taken along line BB in FIG. 3 (b). FIG. 3 is a sectional view showing a sectional view corresponding to FIG. 1A, and FIG. 3B is a schematic sectional view taken along line CC in FIG. 3A. FIG. 3 is a cross-sectional view corresponding to FIG. 1B. It is explanatory drawing which shows the high frequency current _IH and the eddy current _IE which flow through the induction coil in 1st Embodiment of the induction heating apparatus by this invention. FIG. 5 is a configuration explanatory diagram of the second embodiment of the induction heating apparatus according to the present invention, and corresponds to the configuration explanatory diagram shown in FIG. FIG. 6 is a configuration explanatory diagram of the third embodiment of the induction heating apparatus according to the present invention, and corresponds to the configuration explanatory diagram shown in FIG. FIG. 7 is an explanatory diagram of the configuration of the fourth embodiment of the induction heating device according to the present invention, and corresponds to the configuration explanatory diagram shown in FIG. FIG. 8 (a) is a diagram for explaining the configuration of the fifth embodiment of the induction heating apparatus according to the present invention, and FIG. 8 (b) shows the sixth embodiment of the induction heating apparatus according to the present invention. FIG. 8A and FIG. 8B correspond to the configuration explanatory diagram shown in FIG. FIG. 9 is a cross-sectional explanatory diagram illustrating an example of a configuration for cooling the induction coil. FIG. 10 is a cross-sectional explanatory view showing the arrangement of a line for passing a conventional high-frequency current. FIG. 11 is an explanatory cross-sectional view showing the arrangement of lines for supplying a high-frequency current for carrying out the heating suppression method using the leakage magnetic flux of the high-frequency current according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Induction heating apparatus 12 Feeder 14 1st induction coil 16 Feeder 18 2nd induction coil 20 Plate-shaped to-be-heated object 20a, 20b Edge 100 Induction heating apparatus 102 Feeder 102a, 102b End part 104 Feeder 104a, 104b End part 106 Induction coil 106a 106b End portion 106c Intersection portion 106d, 106e, 106f, 106g Loop portion 108 U-shaped ferrite core 108a End portion 110 Plate-like heated object 110a, 110b Edge 200 Induction heating device 300 Induction heating device 400 Induction heating device 402 Core 402a Magnetic body 500 Induction heating device 600 Induction heating device 700 Tubular insulating member 800 Structure 800a, 800b Region 802, 804 Line

Claims (5)

In an induction heating apparatus that heats the object to be heated by inducing an eddy current in the object to be heated by supplying a high frequency current to the induction coil,
An induction heating apparatus, wherein an induction coil or a feeding portion that supplies a high-frequency current to the induction coil is crossed at least once to reverse the direction of the current. The induction heating apparatus according to claim 1,
The induction coils are arranged facing each other with a predetermined gap;
The induction heating apparatus, wherein the crossing portions of the induction coils arranged to face each other with a predetermined gap therebetween are arranged to face each other. In the induction heating apparatus according to any one of claims 1 and 2,
The induction coil is disposed on a magnetic member;
An induction heating apparatus, wherein an intersection of the induction coils is arranged at a predetermined position of the magnetic member. In the induction heating apparatus according to any one of claims 1, 2, and 3,
The induction coil is disposed in a tubular insulating member and cooled by cooling water supplied into the tubular insulating member. In the heating suppression method by the high-frequency current leakage magnetic flux that suppresses the surface of the structure adjacent to the line from being heated by the leakage magnetic flux of the high-frequency current flowing through the line arranged inside the structure,
When arranging a line through which a high-frequency current flows in the structure, a portion where the lines intersect in the structure is formed so that the current direction is opposite in the extension direction of the line, A high-frequency current characterized in that the current flowing to the structure located around the line due to the leakage magnetic flux is canceled out to make the current difficult to flow through the structure, and the heat generation of the structure is suppressed. To suppress heating by magnetic flux leakage.

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