Induction heating coil

Abstract

To provide an induction heating coil capable of performing induction heating by inserting an object to be heated into the induction heating coil, capable of performing uniform induction heating of the object to be heated so that heating distribution becomes uniform, and having improved heating efficiency.SOLUTION: In an induction heating coil for heating an object to be heated by induction heating, a first induction heating coil portion and a second induction heating coil portion in which a high-frequency current flows in the same direction are disposed at an interval at which the object to be heated can be disposed, and a first magnetic material is disposed in a first object-to-be-heated adjacent region that is adjacent to and faces the second induction heating coil portion on an inner diameter side of the first induction heating coil portion. A second magnetic material is arranged in a second heating object adjacent area adjacently opposed to the first induction heating coil part on the inner diameter side of the second induction heating coil part.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an induction heating coil, and more particularly to an induction heating coil capable of uniformly heating an object to be heated. [Background technology]

[0002] Conventionally, so-called saddle-type induction heating coils (also called "hairpin-type induction heating coils") have been used as induction heating coils used when inserting an object to be heated into an induction heating coil and inducing heating, such as in induction heating brazing work.

[0003] Here, we consider the case where a cylindrical object 300 is induction heated in a front end region A of a saddle-type induction heating coil 200 connected to a high-frequency power supply 100 as shown in FIG. 1 when an object to be heated is induction heated using a conventional saddle-type induction heating coil.

[0004] In this case, a looping induction current is generated on the peripheral surface portions extending along the axial direction of the object to be heated 300, which face the upper coil 200a and the lower coil 200b of the saddle-shaped induction heating coil 200, respectively, and the object to be heated 300 can be induction heated.

[0005] On the other hand, since induced currents flow from the upper coil 200a and the lower coil 200b of the saddle-shaped induction heating coil 200 in directions that cancel each other out on both the left and right side surfaces of the object to be heated 300, the object to be heated 300 is not directly induction heated.

[0006] That is, as shown in FIG. 1, when the object to be heated 300 is induction heated in the front end region A of the saddle-shaped induction heating coil 200, the peripheral surface extending along the axial direction of the object to be heated 300 is directly induction heated, but on the other hand, both the left and right side surfaces of the object to be heated 300 are not directly induction heated, which causes a problem that the heating distribution in the cross-sectional direction of the object to be heated 300 is not uniform.

[0007] Next, we will consider the case where an object to be heated is induction heated using a conventional saddle-type induction heating coil, and the object to be heated 300 is induction heated in the pocket region B of the saddle-type induction heating coil 200 connected to the high-frequency power supply 100, as shown in Figure 2.

[0008] In this case, opposing induced currents flow at both the left and right ends of the object to be heated 300, so the center of the object to be heated 300 is not directly induction heated.

[0009] Therefore, as shown in FIG. 2, even when the object to be heated 300 is induction heated in the pocket region B of the saddle-shaped induction heating coil 200, there is a problem in that the heating distribution of the object to be heated 300 is not uniform.

[0010] Furthermore, when attempting to achieve a uniform heating distribution over an object to be heated using the above-described conventional saddle-type induction heating coil, it is necessary to provide a mechanism for relatively moving the positions of the saddle-type induction heating coil and the object to be heated, for example by rotating the object relative to the saddle-type induction heating coil, and to perform the moving operation. This creates new problems in that the mechanism and operation become complicated.

[0011] In order to solve these various problems, the inventors of the present application have proposed an induction heating coil, as shown in Figures 3 and 4 of JP 2019-212538 A, in which an object to be heated can be inserted into the induction heating coil and induction heated, and the object to be heated can be uniformly induction heated so that the heating distribution is uniform.

[0012] The induction heating coil disclosed in Figures 3 and 4 of JP 2019-212538 A allows the object to be inserted into the induction heating coil by connecting two heating coil sections so that the direction of the current flowing through the two heating coil sections is aligned, and the object to be heated can be uniformly induction heated so that the heating distribution is uniform.

[0013] The induction heating coil disclosed in Figures 3 and 4 of Japanese Patent Application Laid-Open No. 2019-212538 will be described in detail below with reference to the accompanying Figures 3 to 4. Note that Figure 3 is a view seen from the arrow D in Figure 4, and Figure 4 is a view seen from the arrow C in Figure 3.

[0014] The induction heating coil 400 shown in FIGS. 3 and 4 is configured to include a first induction heating coil portion 12 and a second induction heating coil portion 14 each connected to a high-frequency power supply 30.

[0015] Here, the first induction heating coil section 12 and the second induction heating coil section 14 are each configured by being wound in a spiral shape (solenoid shape), and the first induction heating coil section 12 and the second induction heating coil section 14 have approximately the same shape.

[0016] Specifically, the first induction heating coil section 12 and the second induction heating coil section 14 have an approximately rectangular shape in the XZ plane, and the first induction heating coil section 12 and the second induction heating coil section 14 are arranged so that the side regions of each of the approximately rectangular shapes face each other.

[0017] In addition, the first induction heating coil section 12 and the second induction heating coil section 14 have their solenoid axis directions (extension directions) extending in the front-to-back direction, and are arranged on the same plane in the vertical direction with a predetermined gap G in the left-to-right direction.

[0018] The first induction heating coil portion 12 and the second induction heating coil portion 14 are wound in a spiral shape (solenoid shape) in the same winding direction when viewed from the C arrow and the D arrow.

[0019] Here, the gap G is set to a dimension that allows a margin for inserting the object to be heated 20 between the first induction heating coil portion 12 and the second induction heating coil portion 14 from below.

[0020] In the example shown in Figs. 3 and 4, the object to be heated 20 has a cylindrical shape.

[0021] In the induction heating coil 400, a front end portion 12a located above one end portion (front end portion) in the extension direction of the spiral shape of the first induction heating coil portion 12 and a rear end portion 14a located above the other end portion (rear end portion) opposite the one end portion in the spiral shape of the second induction heating coil portion 14 are electrically connected by a connection portion 16.

[0022] In addition, in the induction heating coil 400, the rear end 12b located above the end (rear end) on the other side opposite to the one side in the spiral shape of the first induction heating coil section 12 is electrically connected to the high-frequency power supply 30, and the front end 14b located above the one end (front end) in the spiral shape of the second induction heating coil section 14 is electrically connected to the high-frequency power supply 30.

[0023] Therefore, when high frequency current is applied to the induction heating coil 400 from the high frequency power supply 30, the high frequency current flows in the same direction through the first induction heating coil portion 12 and the second induction heating coil portion 14 as viewed in the C and D arrow directions.

[0024] In the above configuration, the object to be heated 20 is inserted between the first induction heating coil section 12 and the second induction heating coil section 14 from below, and a high frequency current is applied to the induction heating coil 10 by the high frequency power supply 30.

[0025] Furthermore, since the first induction heating coil section 12 and the second induction heating coil section 14 are connected on the upper side, the object to be heated 20 can be put in and taken out from the lower side, so there are no restrictions when placing the object to be heated 20 in the gap G between the first induction heating coil section 12 and the second induction heating coil section 14.

[0026] When high-frequency current is passed through the induction heating coil 10 by the high-frequency power supply 30, as viewed from the arrows C and D, high-frequency current flows in the same direction through the first induction heating coil section 12 and the second induction heating coil section 14, and the induced current flows in the same direction and uniformly along the circumferential surface of the object to be heated 20.

[0027] That is, electromagnetic induction is received from the first induction heating coil portion 12 on the left side and the second induction heating coil portion 14 on the right side, and an induced current flows uniformly in the same direction along the circumferential surface of the object 20 to be heated.

[0028] That is, in the object to be heated 20, the same induced current flows at any position in the front-rear direction.

[0029] Therefore, with the induction heating coil 400, the object 20 to be heated can be uniformly induction heated by the induction current flowing through the object 20 to be heated.

[0030] As described above, the induction heating coil 400 makes it possible to uniformly inductively heat the object 20 to obtain a uniform heating distribution.

[0031] Furthermore, according to the induction heating coil 400, the first induction heating coil portion 12 and the second induction heating coil portion 14 only need to have an approximately rectangular shape in the XZ plane, so the first induction heating coil portion 12 and the second induction heating coil portion 14 can be easily manufactured.

[0032] Furthermore, according to the induction heating coil 400, the first induction heating coil section 12 and the second induction heating coil section 14 are arranged so that the side regions of each of the approximately rectangular shapes face each other, and the object to be heated 20 is inserted between them and electromagnetically induced, so that the object to be heated 20 can be heated efficiently.

[0033] Furthermore, the induction heating coil 400 can uniformly heat the object to be heated 20 and achieve a uniform heating distribution without having to move the relative positions of the induction heating coil 400 and the object to be heated 20, resulting in a simple configuration and good workability.

[0034] As explained above, according to the induction heating coil disclosed in Figures 3 and 4 of JP 2019-212538 A, it is possible to insert an object to be heated into the induction heating coil and inductively heat it, and it is possible to uniformly inductively heat the object to be heated so that the heating distribution is uniform.

[0035] However, the induction heating coil disclosed in Figures 3 and 4 of JP 2019-212538 A has been pointed out as having a problem in that heating efficiency is poor because heating is performed outside the induction heating coil. [Prior art documents] [Patent documents]

[0036] [Patent Document 1] Japanese Patent Application Publication No. 2019-212538 Summary of the Invention [Problem to be solved by the invention]

[0037] The present invention has been made in consideration of the various problems in the conventional technology as described above, and its object is to provide an induction heating coil that allows an object to be inserted into the induction heating coil and be induction heated, that can uniformly inductively heat the object to be heated so that the heating distribution is uniform, and that has improved heating efficiency. [Means for solving the problem]

[0038] In order to achieve the above object, the present invention arranges a first induction heating coil section and a second induction heating coil section, through which a high-frequency current flows in the same direction, with a gap large enough to accommodate an object to be heated, and arranges a first magnetic material in an area of ​​the first induction heating coil section that is adjacent to and facing the second induction heating coil section, and arranges a second magnetic material in an area of ​​the second induction heating coil section that is adjacent to and facing the first induction heating coil section.

[0039] Therefore, according to the present invention, by placing an object to be heated between a first induction heating coil section and a second induction heating coil section, through which high-frequency current flows in the same direction, it becomes possible to flow an induction current that is uniform around the cross section of the object to be heated and that rotates in the same direction, thereby enabling the object to be heated uniformly and achieving a uniform heating distribution.

[0040] Furthermore, according to the present invention, a gap is provided between the first induction heating coil section and the second induction heating coil section so that an object to be heated can be placed therein, and therefore the object to be heated can be inserted and placed between the first induction heating coil section and the second induction heating coil section.

[0041] Furthermore, according to the present invention, the object to be heated can be heated uniformly and the heating distribution can be made uniform without having to move the relative positions of the induction heating coil and the object to be heated, so the configuration is simple and the workability is good.

[0042] Furthermore, according to the present invention, by arranging a first magnetic material in a region of the first induction heating coil section that is adjacent to and facing the second induction heating coil section, and by arranging a second magnetic material in a region of the second induction heating coil section that is adjacent to and facing the first induction heating coil section, the magnetic flux density of the first induction heating coil section and the second induction heating coil section is increased, and the first magnetic material and the second magnetic material are arranged adjacent to the object to be heated, so that the magnetic flux penetrating the object to be heated can be increased and heating efficiency can be improved.

[0043] That is, the present invention provides an induction heating coil for heating an object to be heated by induction heating, which comprises a first induction heating coil section and a second induction heating coil section arranged with a gap therebetween that allows the object to be placed thereon, the first induction heating coil section and the second induction heating coil section each having a spiral shape, the object to be heated being placed between the extension direction of the spiral shape of the first induction heating coil section and the extension direction of the spiral shape of the second induction heating coil section, and current being applied to the first induction heating coil section and the second induction heating coil section. In this induction heating coil, an induction current flows in the same direction along the circumferential surface of the object to be heated due to a high-frequency current flowing through the first induction heating coil portion and the second induction heating coil portion, and a first magnetic material is arranged in a first object-adjacent region adjacent to and facing the second induction heating coil portion on the inner diameter side of the first induction heating coil portion, and a second magnetic material is arranged in a second object-adjacent region adjacent to and facing the first induction heating coil portion on the inner diameter side of the second induction heating coil portion.

[0044] Furthermore, in the present invention described above, the first magnetic material is divided into two and arranged with a first gap at approximately the center in the coil axis direction in the first heated object adjacent region, and the second magnetic material is divided into two and arranged with a second gap at approximately the center in the coil axis direction in the second heated object adjacent region.

[0045] Furthermore, in the present invention described above, the first induction heating coil section and the second induction heating coil section have a hollow pipe shape, and cooling water is supplied into the pipe shape of the first induction heating coil section and the second induction heating coil section having the pipe shape.

[0046] Furthermore, the present invention is the above-described invention, wherein the first magnetic material is adhered to the area adjacent to the first heated object by an adhesive having thermal conductivity and electrical insulation properties, and the second magnetic material is adhered to the area adjacent to the second heated object by an adhesive having thermal conductivity and electrical insulation properties.

[0047] Furthermore, in the present invention, the first induction heating coil portion and the second induction heating coil portion are wound in a spiral shape in the same winding direction.

[0048] Furthermore, in the present invention, the first induction heating coil portion and the second induction heating coil portion are wound in a spiral shape in opposite winding directions.

[0049] Furthermore, in the present invention described above, one end of the first induction heating coil portion in the extension direction of the spiral shape is connected to the other end of the second induction heating coil portion opposite to the one end of the one side in the extension direction of the spiral shape, and the other end of the first induction heating coil portion in the spiral shape and the one end of the second induction heating coil portion in the spiral shape are connected to a high-frequency power source that supplies high-frequency current to the first induction heating coil portion and the second induction heating coil portion.

[0050] Furthermore, in the present invention described above, one end of the first induction heating coil portion in the extension direction of the spiral shape is connected to one end of the second induction heating coil portion in the extension direction of the spiral shape, and the other end of the first induction heating coil portion opposite to the one end of the spiral shape and the other end of the spiral shape of the second induction heating coil portion are connected to a high-frequency power source that supplies high-frequency current to the first induction heating coil portion and the second induction heating coil portion.

[0051] In the present invention, the spiral shape is formed by spirally continuing substantially rectangular regions.

[0052] Further, in the present invention, the spiral shape is a normal spiral shape or a parallel-wound spiral shape. [Effects of the Invention]

[0053] Since the present invention is configured as described above, it is possible to insert an object to be heated into the induction heating coil and inductively heat it, and it is possible to uniformly inductively heat the object to be heated so that the heating distribution is uniform, and it is possible to improve heating efficiency, which are excellent effects. [Brief explanation of the drawings]

[0054] [Figure 1] FIG. 1 is an explanatory diagram that schematically shows a case where an object to be heated is induction-heated in the front end region of a conventional saddle-type induction heating coil when the object to be heated is induction-heated using the saddle-type induction heating coil. [Figure 2] FIG. 2 is an explanatory diagram that schematically shows a case where an object to be heated is induction-heated in a pocket region of a saddle-type induction heating coil when the object to be heated is induction-heated using a conventional saddle-type induction heating coil. [Figure 3] FIG. 3 is an explanatory diagram schematically showing a conventional induction heating coil, and is a view taken along the arrow D in FIG. [Figure 4] FIG. 4 is an explanatory diagram schematically showing a conventional induction heating coil, and is a view taken along the arrow C in FIG. [Figure 5] FIG. 5 is an explanatory diagram schematically showing an induction heating coil according to an example of an embodiment of the present invention, and is a view taken along arrow F in FIG. [Figure 6] FIG. 6 is an explanatory diagram schematically showing an induction heating coil according to an example of an embodiment of the present invention, and is a view taken along arrow E in FIG. [Figure 7] FIG. 7 is an explanatory diagram that schematically shows a cross section of a main part of the induction heating coil shown in FIGS. [Figure 8] FIG. 8 is an explanatory diagram schematically illustrating an enlarged cross section of a part of the induction heating coil shown in FIGS. 5 and 6. In FIG. [Figure 9] FIG. 9 is an explanatory diagram schematically showing an induction heating coil according to another embodiment of the present invention, and is a view taken along the arrow I in FIG. [Figure 10] FIG. 10 is an explanatory diagram schematically showing an induction heating coil according to another embodiment of the present invention, taken along the arrow H in FIG. [Figure 11] FIG. 11 is an explanatory diagram schematically showing an induction heating coil according to another embodiment of the present invention, and is a view taken along arrow K in FIG. [Figure 12] FIG. 12 is an explanatory diagram schematically showing an induction heating coil according to another embodiment of the present invention, taken along the arrow J in FIG. [Figure 13] FIG. 13 is an explanatory diagram that schematically shows an induction heating coil according to another example of the embodiment of the present invention, and is an explanatory diagram that schematically shows a cross section of a main part of the induction heating coil corresponding to FIG. [Figure 14] FIG. 14 is an explanatory diagram schematically showing an induction heating coil according to another example of an embodiment of the present invention, and is an explanatory diagram schematically showing an enlarged cross section of a part of the induction heating coil corresponding to FIG. 8. [Figure 15] FIG. 15 is an explanatory diagram that schematically shows an induction heating coil according to another example of an embodiment of the present invention, and is an explanatory diagram that schematically shows a cross section of a main part of the induction heating coil corresponding to FIG. [Figure 16] FIG. 16 is an explanatory diagram schematically showing an induction heating coil according to another example of an embodiment of the present invention, and is an explanatory diagram schematically showing an enlarged cross section of a part of the induction heating coil corresponding to FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0055] An embodiment of an induction heating coil according to the present invention will be described in detail below with reference to the accompanying drawings.

[0056] In the following description, components that are the same as or equivalent to those described with reference to Figures 1 to 4 will be indicated using the same reference numerals as appropriate, and detailed descriptions of their configurations and their functions will be omitted as appropriate.

[0057] FIG. 5 is an explanatory diagram schematically showing an induction heating coil according to an example of an embodiment of the present invention, and shows a view taken along arrow F in FIG.

[0058] FIG. 6 is an explanatory diagram schematically showing an induction heating coil according to an example of an embodiment of the present invention, taken along the arrow E in FIG.

[0059] Furthermore, FIG. 7 is an explanatory diagram that schematically shows a cross section of a main part of the induction heating coil shown in FIGS.

[0060] Furthermore, FIG. 8 is an explanatory diagram that shows a schematic enlarged cross section of a part of the induction heating coil shown in FIGS.

[0061] The induction heating coil 10 is configured to have a solid first induction heating coil portion 12 and a solid second induction heating coil portion 14, each connected to a high frequency power supply 30.

[0062] Here, the first induction heating coil section 12 and the second induction heating coil section 14 are each configured by being wound in a spiral shape (solenoid shape), and the first induction heating coil section 12 and the second induction heating coil section 14 have approximately the same shape.

[0063] Specifically, the first induction heating coil section 12 and the second induction heating coil section 14 have an approximately rectangular shape in the XZ plane, and the first induction heating coil section 12 and the second induction heating coil section 14 are arranged so that the side regions of each of the approximately rectangular shapes face each other.

[0064] In addition, the first induction heating coil section 12 and the second induction heating coil section 14 have their solenoid axis directions (extension directions) extending in the front-to-back direction, and are arranged on the same plane in the vertical direction with a predetermined gap G in the left-to-right direction.

[0065] The first induction heating coil portion 12 and the second induction heating coil portion 14 are wound in a spiral shape (solenoid shape) in the same winding direction when viewed from the arrow E and the arrow F.

[0066] Here, the gap G is set to a dimension that allows a margin for inserting the object to be heated 20 between the first induction heating coil portion 12 and the second induction heating coil portion 14 from below.

[0067] In this embodiment, the object to be heated 20 has a cylindrical shape.

[0068] In the induction heating coil 10, a front end portion 12a located above one end portion (front end portion) in the extension direction of the spiral shape of the first induction heating coil portion 12 and a rear end portion 14a located above the other end portion (rear end portion) opposite the one end portion in the spiral shape of the second induction heating coil portion 14 are electrically connected by a connection portion 16.

[0069] In addition, in the induction heating coil 10, the rear end 12b located above the end (rear end) on the other side opposite to the one side in the spiral shape of the first induction heating coil section 12 is electrically connected to the high-frequency power supply 30, and the front end 14b located above the one end (front end) in the spiral shape of the second induction heating coil section 14 is electrically connected to the high-frequency power supply 30.

[0070] Therefore, when a high frequency current is applied to the induction heating coil 10 from the high frequency power supply 30, the high frequency current flows in the same direction through the first induction heating coil portion 12 and the second induction heating coil portion 14 as viewed in the E and F arrow directions.

[0071] Furthermore, in an object-to-be-heated adjacent region 12c adjacent to and facing the second induction heating coil portion 14 on the inner diameter side of the first induction heating coil portion 12, a plate-shaped first ferrite core 502 is disposed as a first magnetic material.

[0072] Similarly, a plate-shaped second ferrite core 504 is disposed as a second magnetic material in an area 14c adjacent to the object to be heated that is adjacent to and faces the first induction heating coil section 12 on the inner diameter side of the second induction heating coil section 14.

[0073] More specifically, the first ferrite core 502 is divided into two parts with a gap G1 at approximately the center in the coil axis direction in the heated object adjacent region 12c, and is adhered to the heated object adjacent region 12c with an electrically insulating adhesive 506.

[0074] Similarly, the second ferrite core 504 is divided into two parts with a gap G2 at approximately the center in the coil axis direction in the heated object adjacent region 14c, and is adhered to the heated object adjacent region 14c with an adhesive 506 that has electrical insulating properties.

[0075] Here, the gap G1 may be equal to the coil pitch of the first induction heating coil portion 12 in the region 12c adjacent to the object to be heated, or may be adjusted as appropriate.

[0076] Similarly, the gap G2 may be set to be equal to the coil pitch in the object-to-be-heated adjacent region 14c of the second induction heating coil portion 14, or may be adjusted as appropriate.

[0077] Furthermore, the first ferrite core 502 and the second ferrite core 504 may have the same configuration, and the gap G1 and the gap G2 may be equally spaced.

[0078] In the above configuration, the object to be heated 20 is inserted between the first induction heating coil section 12 and the second induction heating coil section 14 from below, and a high frequency current is applied to the induction heating coil 10 by the high frequency power supply 30.

[0079] Furthermore, since the first induction heating coil section 12 and the second induction heating coil section 14 are connected on the upper side, the object to be heated 20 can be put in and taken out from the lower side, so there are no restrictions when placing the object to be heated 20 in the gap G between the first induction heating coil section 12 and the second induction heating coil section 14.

[0080] When high-frequency current is passed through the induction heating coil 10 by the high-frequency power supply 30, high-frequency current flows in the same direction in the first induction heating coil section 12 and the second induction heating coil section 14 as viewed by arrows E and F, and the induced current flows in the same direction and uniformly along the circumferential surface of the object to be heated 20.

[0081] That is, electromagnetic induction is received from the first induction heating coil portion 12 on the left side and the second induction heating coil portion 14 on the right side, and an induced current flows uniformly in the same direction along the circumferential surface of the object 20 to be heated.

[0082] That is, in the object to be heated 20, the same induced current flows at any position in the front-rear direction.

[0083] Therefore, the induction heating coil 10 can uniformly inductively heat the object 20 to be heated by the induction current flowing through the object 20 to be heated.

[0084] Furthermore, in the induction heating coil 10, the first ferrite core 502 is arranged in the heated object adjacent region 12c of the first induction heating coil section 12 that is adjacent to and faces the second induction heating coil section 14, and the second ferrite core 504 is arranged in the heated object adjacent region 14c of the second induction heating coil section 14 that is adjacent to and faces the first induction heating coil section 12.This increases the magnetic flux density of the first induction heating coil section 12 and the second induction heating coil section 14, and since the first ferrite core 502 and the second ferrite core 504 are arranged adjacent to the heated object 20, the magnetic flux penetrating the heated object 20 can be increased, thereby improving heating efficiency.

[0085] Furthermore, in the induction heating coil 10, the temperature of the part of the object to be heated 20 located in the central part in the coil axis direction is likely to rise, but since the first ferrite core 502 is divided into two parts with a gap G1 and the second ferrite core 504 is divided into two parts with a gap G2, the ferrite cores are arranged leaving the central part in the coil axis direction empty.In other words, since the ferrite cores are arranged so that they are not present in the central part in the coil axis direction, it is possible to maintain temperature uniformity in the coil axis direction of the object to be heated 20, i.e., in the length direction of the object to be heated 20.

[0086] As described above, the induction heating coil 10 makes it possible to uniformly inductively heat the object 20 to achieve a uniform heating distribution.

[0087] Furthermore, according to the induction heating coil 10, the first induction heating coil portion 12 and the second induction heating coil portion 14 only need to have an approximately rectangular shape in the XZ plane, so the first induction heating coil portion 12 and the second induction heating coil portion 14 can be easily manufactured.

[0088] Furthermore, according to the induction heating coil 10, the first induction heating coil section 12 and the second induction heating coil section 14 are arranged so that the side regions of each of the approximately rectangular shapes face each other, and the object to be heated 20 is inserted between them and electromagnetically induced, so that the object to be heated 20 can be heated efficiently.

[0089] Furthermore, the induction heating coil 10 can uniformly heat the object to be heated 20 and achieve a uniform heating distribution without having to move the relative positions of the induction heating coil 10 and the object to be heated 20, resulting in a simple configuration and good workability.

[0090] Furthermore, the induction heating coil 10 increases the magnetic flux density of the first induction heating coil section 12 and the second induction heating coil section 14, and also increases the magnetic flux penetrating the object to be heated 20, thereby improving the heating efficiency.

[0091] Furthermore, the induction heating coil 10 can maintain uniform temperature in the coil axis direction of the object 20 to be heated, that is, in the length direction of the object 20 to be heated.

[0092] It should be noted that the above-described embodiments are merely examples, and the present invention can be embodied in various other forms. In other words, the present invention is not limited to the above-described embodiments, and various omissions, substitutions, modifications, etc. can be made within the scope of the gist of the present invention.

[0093] For example, the above-described embodiments may be modified as shown in the following (1) to (11).

[0094] (1) In the above embodiment, a case has been described in which a plate-shaped first ferrite core 502 is disposed as the first magnetic material, and a plate-shaped second ferrite core 504 is disposed as the second magnetic material. That is, in the above embodiment, a case has been described in which a ferrite core is used as the magnetic material, but a ferrite core is merely one example of a magnetic material, and the magnetic material is not limited to a ferrite core, and various magnetic materials may be used appropriately in the present invention as well.

[0095] (2) In the above-described embodiment, the first induction heating coil section 12 and the second induction heating coil section 14 are wound in a spiral shape (solenoid shape) with the same winding direction when viewed from the arrows E and F. However, this is not necessarily limited to this. For example, as shown in Fig. 9 and Fig. 10, the first induction heating coil section 12 and the second induction heating coil section 14 may be wound in a spiral shape (solenoid shape) with the winding directions opposite to each other (opposite winding directions) when viewed from the arrows H and I, so that the spiral (solenoid) windings are symmetrical across the gap G.

[0096] 9 and 10 , the rear end 12b of the first induction heating coil section 12 and the rear end 14a of the second induction heating coil section 14 are electrically connected by the connecting section 16. Furthermore, the front end 12a of the first induction heating coil section 12 is electrically connected to the high-frequency power supply 30, and the front end 14b of the second induction heating coil section 14 is electrically connected to the high-frequency power supply 30. When the first induction heating coil section 12, the second induction heating coil section 14, the connecting section 16, and the high-frequency power supply 30 are connected in this manner, when a high-frequency current is applied to the induction heating coil 10 from the high-frequency power supply 30, the high-frequency current flows in the same direction through the first induction heating coil section 12 and the second induction heating coil section 14, as viewed by arrows H and I.

[0097] (3) In the above-described embodiment, a single high-frequency power supply 30 is used to pass high-frequency current through the first induction heating coil portion 12 and the second induction heating coil portion 14, but the present invention is not limited to this. For example, the induction heating coil 10 may be configured such that the first induction heating coil portion 12 and the second induction heating coil portion 14 are electrically insulated without providing the connecting portion 16, and high-frequency power supplies for passing high-frequency current through the first induction heating coil portion 12 and the second induction heating coil portion 14 may be provided separately, and the high-frequency power supplies provided for the first induction heating coil portion 12 and the second induction heating coil portion 14 may be driven synchronously to start and stop current flow.

[0098] (4) In the above-described embodiment, the first induction heating coil section 12 and the second induction heating coil section 14 are configured to have a substantially rectangular shape in the XZ plane, but of course, this is not limited to this. For example, the first induction heating coil section 12 and the second induction heating coil section 14 may be configured to have a substantially circular shape in the XZ plane, or the first induction heating coil section 12 and the second induction heating coil section 14 may be configured to have a substantially triangular shape or an appropriate polygonal shape of approximately pentagonal or greater in size in the XZ plane.

[0099] (5) In the above embodiment, a cylindrical object to be heated is heated as the heated portion 20. However, the present invention is not limited to this. For example, the heated portion 20 may be in the shape of a polygonal pillar or other shapes.

[0100] (6) In the above-described embodiment, the first induction heating coil section 12 and the second induction heating coil section 14 are connected to each other at the upper side by the connecting section 16. However, the present invention is not limited to this. For example, the first induction heating coil section 12 and the second induction heating coil section 14 may be connected to each other at the lower side. Even if the first induction heating coil section 12 and the second induction heating coil section 14 are connected to each other at the lower side, the object to be heated 20 can be placed in and out from above, so there is no restriction on placing the object to be heated 20 in the gap G between the first induction heating coil section 12 and the second induction heating coil section 14.

[0101] (7) In the above-described embodiment, the spiral shape of the first induction heating coil section 12 and the second induction heating coil section 14 is shown as a regular spiral shape, but it is needless to say that this is not limited to this. The spiral shape of the first induction heating coil section 12 and the second induction heating coil section 14 may be, for example, a so-called parallel spiral shape in which the height of the winding (position in the Y-axis direction) is changed at only one circumferential point and the height (position in the Y-axis direction) of other parts is kept constant, as shown in Figures 11 and 12. In short, the spiral shape in this invention means the general shape of a three-dimensional curve that rotates while rising in a direction with a component perpendicular to the plane of rotation, and is not particularly limited.

[0102] (8) In the above-described embodiment, the induction heating coil 10 is configured to have a solid first induction heating coil portion 12 and a solid second induction heating coil portion 14, but it goes without saying that the present invention is not limited to this.

[0103] For example, as shown in Fig. 13, the induction heating coil 10 may be configured by using a hollow pipe-shaped first induction heating coil section 12' instead of the solid first induction heating coil section 12, and a hollow pipe-shaped second induction heating coil section 14' instead of the solid second induction heating coil section 14. With this configuration, it is possible to supply cooling water into the pipe-shaped first induction heating coil section 12' and second induction heating coil section 14' in the induction heating coil 10. By supplying cooling water to the first induction heating coil section 12' and the second induction heating coil section 14', the first induction heating coil section 12' and the second induction heating coil section 14' can be cooled by the cooling water, and the first ferrite core 502 arranged in the heated object adjacent region 12c and the second ferrite core 504 arranged in the heated object adjacent region 14c can also be cooled, thereby further improving heating efficiency.

[0104] 13, the first ferrite core 502 is bonded to the object-to-be-heated adjacent region 12c and the second ferrite core 504 is bonded to the object-to-be-heated adjacent region 14c using a thermally conductive and electrically insulating adhesive 600 as the adhesive, as shown in Fig. 14. This allows the cooling water flowing through the hollow pipe-shaped induction heating coil 10 to further cool the first ferrite core 502 and the second ferrite core 504 due to the thermal conductivity of the adhesive 600, thereby further improving heating efficiency.

[0105] As the adhesive 600 having the thermal conductivity and electrical insulation properties, TSE3380 or the like can be used.

[0106] (9) In the above embodiment, the first ferrite core 502 and the second ferrite core 504 are divided into two parts with a space between them at the center in the coil axis direction, but the present invention is not limited to this. For example, as shown in Fig. 15, the first ferrite core 502 and the second ferrite core 504 may be formed as an integral structure without being divided into two parts with a space between them at the center in the coil axis direction.

[0107] (10) In the above-described embodiment, the first ferrite core 502 is adhered to the heated object adjacent region 12c and the second ferrite core 504 is adhered to the heated object adjacent region 14c using the adhesive 506 or the adhesive 600. However, the present invention is not limited to this. For example, as shown in Fig. 16, the first ferrite core 502 may be supported and positioned adjacent to the heated object adjacent region 12c using a support member (not shown) or the like, and the second ferrite core 504 may be supported and positioned adjacent to the heated object adjacent region 14c using a support member (not shown) or the like, with a gap G3 that ensures electrical insulation.

[0108] (11) Of course, the above-described embodiments and the embodiments shown in (1) to (10) above may be combined as appropriate. [Industrial Applicability]

[0109] The present invention can be used when an object to be heated is inserted into an induction heating coil and induction heated, such as in brazing work using induction heating. [Explanation of symbols]

[0110] 10 induction heating coil 12 First induction heating coil (first induction heating coil) 12' First induction heating coil (first induction heating coil) 12a Front end of first induction heating coil 12b Rear end of first induction heating coil 12c: Area adjacent to the object to be heated of the first induction heating coil (first area adjacent to the object to be heated) 14 Second induction heating coil (second induction heating coil) 14' Second induction heating coil (Second induction heating coil) 14a Rear end of second induction heating coil 14b Front end of second induction heating coil 14c: Area adjacent to the object to be heated of the second induction heating coil (second area adjacent to the object to be heated) 16 Connection 20 Object to be heated 30 High frequency power supply 40 Square prism-shaped body 42 Square prism-shaped body 100 high frequency power supply 200 Saddle-type induction heating coil 200a Upper coil 200b Lower coil 300 Heated object 400 induction heating coil 502 First ferrite core (first magnetic material) 504 Second ferrite core (second magnetic material) 506 Electrically insulating adhesives 600 Thermally conductive and electrically insulating adhesive A Front end region of the saddle-shaped induction heating coil B. Pocket region of saddle-shaped induction heating coil G Gap between the first induction heating coil and the second induction heating coil G1 Gap when dividing the first ferrite core into two (first gap) G2: Gap when dividing the second ferrite core into two (second gap)

Claims

1. An induction heating coil that heats an object to be heated by induction heating, The heating coil includes a first induction heating coil unit and a second induction heating coil unit that are arranged at a distance that allows an object to be heated to be placed thereon, the first induction heating coil portion and the second induction heating coil portion each have a spiral shape; The object to be heated is placed between an extension direction of the spiral shape of the first induction heating coil portion and an extension direction of the spiral shape of the second induction heating coil portion, In an induction heating coil in which, by energizing the first induction heating coil portion and the second induction heating coil portion, a high-frequency current flows through the first induction heating coil portion and the second induction heating coil portion, and an induction current flows in the same direction along the circumferential surface of the heated object, A first magnetic material is arranged in a first heated object adjacent region adjacent to the second induction heating coil portion on the inner diameter side of the first induction heating coil portion, the first heated object adjacent region facing the second induction heating coil portion, and a second magnetic material is arranged in a second heated object adjacent region adjacent to the first induction heating coil portion on the inner diameter side of the second induction heating coil portion. An induction heating coil characterized by:

2. 2. The induction heating coil according to claim 1, the first magnetic material is divided into two parts with a first gap between them and disposed at a substantially central portion in the coil axis direction in the first heated object adjacent region, The second magnetic material is divided into two parts with a second gap at a substantially central portion in the coil axis direction in the second heated object adjacent region. An induction heating coil characterized by:

3. The induction heating coil according to claim 1 or 2, the first induction heating coil portion and the second induction heating coil portion have a hollow pipe shape, Cooling water is supplied into the pipe-shaped first induction heating coil portion and the pipe-shaped second induction heating coil portion. An induction heating coil characterized by:

4. 4. The induction heating coil according to claim 3, the first magnetic material is adhered to the region adjacent to the first object to be heated by an adhesive having thermal conductivity and electrical insulation properties; The second magnetic material is adhered to the area adjacent to the second object to be heated by an adhesive having thermal conductivity and electrical insulation properties. An induction heating coil characterized by:

5. 4. The induction heating coil according to claim 3, The first induction heating coil portion and the second induction heating coil portion are wound in a spiral shape in the same winding direction. An induction heating coil characterized by:

6. 4. The induction heating coil according to claim 3, The first induction heating coil portion and the second induction heating coil portion are wound in a spiral shape in opposite winding directions. An induction heating coil characterized by:

7. 6. The induction heating coil according to claim 5, an end portion of the first induction heating coil portion on one side in the extension direction of the spiral shape and an end portion of the second induction heating coil portion on the other side opposite to the end portion of the first induction heating coil portion on the one side in the extension direction of the spiral shape are connected to each other; The other end of the spiral shape of the first induction heating coil portion and the one end of the spiral shape of the second induction heating coil portion are connected to a high frequency power source that applies a high frequency current to the first induction heating coil portion and the second induction heating coil portion. An induction heating coil characterized by:

8. 7. The induction heating coil according to claim 6, an end portion of the first induction heating coil portion on one side in the extension direction of the spiral shape and an end portion of the second induction heating coil portion on one side in the extension direction of the spiral shape are connected to each other; The other end of the spiral shape of the first induction heating coil portion opposite to the one end of the spiral shape of the second induction heating coil portion and the other end of the spiral shape of the second induction heating coil portion are connected to a high frequency power source that applies a high frequency current to the first induction heating coil portion and the second induction heating coil portion. An induction heating coil characterized by:

9. 4. The induction heating coil according to claim 3, The spiral shape is a spiral of approximately rectangular regions. An induction heating coil characterized by:

10. 4. The induction heating coil according to claim 3, The spiral shape is a normal spiral shape or a parallel-wound spiral shape. An induction heating coil characterized by:

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