Heating device

Abstract

Heating device (10, 30, 40), with: a magnetic field heating coil (22, 32, 42) which inductively heats a composite material (20) by means of a magnetic field, wherein the magnetic field heating coil (22, 32, 42) a first coil section (22a) which is provided along a first direction, a pair of second coil parts (22b) provided on both sides of the first coil part (22a) in the first direction to be continuous with the first coil part (22a), wherein the second coil parts (22b) are inclined at a predetermined angle (θ) to one side in a second direction orthogonal to the first direction with respect to the first direction, and a pair of third coil parts (22c) provided such that the third coil parts (22c) and the second coil parts (22b) are symmetrical with respect to a line segment drawn in the first direction on the first coil part (22a), and the first coil part (22a) and the second coil parts (22b) are symmetrical with respect to a line segment drawn in the second direction at a center of the first coil part (22a) in the first direction, wherein the composite material (20) has a length in the second direction and a length in the first direction.

Description

Area

[0001] The present invention relates to a heating device with a magnetic field heating coil that inductively heats a composite material by means of a magnetic field. background

[0002] Electromagnetic induction heating devices, in which a coil conductor is installed inside a coil support element, are conventionally known as heating devices (see, for example, patent literature 1). The coil conductor is positioned essentially concentrically on a heating surface of the coil support element.

[0003] US 2008 / 0264932A1 concerns an induction heating device for a metal plate. An upper induction coil located above the metal plate and a lower induction coil located below the metal plate are spaced apart longitudinally and arranged parallel to each other. List of literature Patent literature

[0004] Patent literature 1: JP 2014- 116 293 A Summary Technical Problem

[0005] However, placing a coil conductor as described in patent literature 1 causes the composite material to heat unevenly. Therefore, if a composite material is heated and shaped using a heating device, it may be shaped incorrectly.

[0006] It is therefore an object of the present invention to provide a heating device that is capable of ensuring uniform heating of a composite material. Solution to the problem

[0007] A heating device according to the present invention is defined in claim 1 and comprises a magnetic field heating coil that inductively heats a composite material by means of a magnetic field. The magnetic field heating coil has a first coil section provided along a first direction and a pair of second coil sections provided on both sides of the first coil section in the first direction to be continuous with the first coil section, wherein the second coil sections are inclined at a predetermined angle to one side in a second direction orthogonal to the first direction with respect to the first direction.

[0008] A pair of third coil sections are provided such that the third coil sections and the second coil sections are symmetrical with respect to a line segment drawn in the first direction on the first coil section. The first coil section and the second coil sections are symmetrical with respect to a line segment drawn in the second direction on a midpoint of the first coil section in the first direction. The composite material has a length in the second direction and a length in the first direction.

[0009] According to this structure, the magnetic field heating coil with the first coil part and second coil parts enables the composite material to be heated evenly.

[0010] Furthermore, the magnetic field heating coil with the first coil part, the second coil parts and the third coil parts enables the composite material to be heated evenly over a larger area.

[0011] Furthermore, it is preferred that a heating target of the magnetic field heating coil is a predetermined heating area of ​​the composite material, wherein the heating area has a length L in a second direction, and a length D in a first direction orthogonal to the second direction, wherein in the magnetic field heating coil, the second coil parts are inclined by a predetermined angle to the heating area side with respect to the first direction, the predetermined angle being 0°<θ≤90°, where θ is the predetermined angle, the first coil part has a length l1 in the first direction, and the length l1 of the first coil part is greater than the length D of the heating area: l1>D.

[0012] According to this structure, the magnetic field heating coil can have a shape appropriate for the heating area, which can ensure uniform heating in the heating area.

[0013] Furthermore, it is preferred that the magnetic field heating coil is each of a plurality of magnetic field heating coils provided by arranging them in the second direction.

[0014] According to this structure, the magnetic field heating coils can be placed in the depth direction, which can further improve the uniform heating of the composite material in the depth direction.

[0015] Furthermore, it is preferred that the heating device also has a connecting part that connects the majority of magnetic field heating coils provided by arranging them in the second direction.

[0016] According to this structure, the connecting part joins the magnetic field heating coils, allowing the magnetic field heating coils to have a shape where the parts are connected in a line, that is, a shape drawn with a single line. Thus, the magnetic field heating coils can have a shape that is simply formed with a single conductor.

[0017] Furthermore, it is preferred that the connecting part establishes a connection such that an electric current flowing through one of the magnetic field heating coils adjacent in the second direction and an electric current flowing through the other magnetic field heating coil adjacent in the second direction are out of phase.

[0018] According to this structure, because the magnetic field formed on one side of the magnetic field heating coil and the magnetic field formed on the other side have opposite polarities, it is possible to prevent the magnetic fields from canceling each other out, which allows for preferential heating by the magnetic field heating coils. Brief description of the drawings Fig. Figure 1 is a schematic block diagram of a heating device according to a first embodiment. Fig. Figure 2 is a descriptive illustration showing an example of a heating area and a magnetic field heating coil of the heating device according to the first embodiment. Fig. Figure 3 is a schematic representation of an exemplary form of the magnetic field heating coil in Fig. 2. Fig. Figure 4 is a descriptive illustration showing another example of the heating area and the magnetic field heating coil of the heating device according to the first embodiment. Fig. Figure 5 is a schematic representation of an exemplary form of the magnetic field heating coil in Fig. 4. Fig. Figure 6 is a descriptive illustration showing an example of a heating area of ​​a heating device and a magnetic field heating coil according to a second embodiment. Fig. Figure 7 is a schematic view of an exemplary form of the magnetic field heating coil in Fig. 6. Fig. Figure 8 is a descriptive illustration showing another example of the heating area and the magnetic field heating coil of the heating device according to the second embodiment. Fig. Figure 9 is a schematic representation of an exemplary form of the magnetic field heating coil in Fig. 8. Fig. Figure 10 is a descriptive illustration showing an example of a heating area of ​​a heating device and a magnetic field heating coil according to a third embodiment. Fig. Figure 11 is a schematic representation of an exemplary form of the magnetic field heating coil in Fig. 10. Fig. Figure 12 is a descriptive illustration showing another example of the heating area and the magnetic field heating coil of the heating device according to the third embodiment. Fig. Figure 13 is a schematic representation of an exemplary form of the magnetic field heating coil in Fig. 12. Fig. Figure 14 is a schematic representation of a magnetic field heating coil of a heating device according to a conventional technique. Fig. Figure 15 is a descriptive representation showing a temperature distribution of a heating area heated by the magnetic field heating coil according to conventional technology. Fig. Figure 16 is a descriptive representation showing a temperature distribution of the heating area heated by the magnetic field heating coil according to the first embodiment. Fig. Figure 17 is a descriptive representation showing a temperature distribution of a heating area heated by the magnetic field heating coil according to the second embodiment. Description of the embodiments

[0019] Embodiments of the present invention are described in detail below with reference to the drawings. It is not intended that these embodiments limit the invention. Components in the embodiments described below include those that are simple and can be interchanged by a person skilled in the art, or those that are essentially the same. Furthermore, the components described below can be combined as appropriate, and if there are multiple embodiments, the embodiments can also be combined. [First embodiment]

[0020] A heating device 10 according to a first embodiment is a device to be provided in a forming device which forms a composite material 20 by heating and curing reinforced fiber impregnated with resin. The composite material 20 is described before the heating device 10 is described.

[0021] To form the composite material 20, a plurality of reinforced fiber substrates impregnated with resin are laminated in a lamination direction to form a flat laminated body, the laminated body being placed in the heating device 10 before curing, and the laminated body being heated by the heating device 10. In the following description, the laminated body is sometimes simply referred to as the composite material.

[0022] The reinforced fiber contained within the laminated body is electrically conductive. Applying a magnetic field to the laminated body in the heating device 10 causes an eddy current to be generated within the laminated body. Once the eddy current has been generated within the laminated body, it generates heat due to the electrical resistance of the reinforced fiber. The heat generated in the reinforced fiber is transferred to the resin contained within the laminated body. The resin is, for example, a thermosetting resin. That is to say, the laminated body is a composite material that generates heat when exposed to a magnetic field. In the first embodiment, a carbon fiber is shown as an example of the reinforced fiber contained within the composite material 20, but the reinforced fiber is not limited to this and can be any other type of reinforced fiber.For the thermosetting resin contained in the composite material 20, a resin with epoxy resin is shown as an example in the first embodiment.

[0023] The heating device 10 will be discussed next with reference to Fig. 1 described. Fig. Figure 1 is a schematic block diagram of the heating device according to the first embodiment. The heating device 10 consists of a mold 24 on which the laminated body is placed, a magnetic field heating coil 22 which generates heat by providing the laminated body with a magnetic field, and a control unit 18 which controls the magnetic field heating coil 22.

[0024] The laminated body is placed on top of mold 24 before curing. Mold 24 is made of a material that is transparent to a magnetic field. This means that mold 24 is made of a material that does not change in a magnetic field and does not generate any eddy currents resulting from a magnetic field.

[0025] The magnetic field heating coil 22 is arranged on the opposite side of the laminated body above the mold 24 and is positioned facing the laminated body, with the mold 24 positioned between it and the body. A conductor capable of generating a magnetic field is used for the magnetic field heating coil 22, and the magnetic field heating coil 22 imparts a magnetic field to the laminated body, thereby heating a predetermined heating area E.

[0026] An example of the heating area E and the magnetic field heating coil 22 will now be given with reference to Fig. 2 described. Fig. Figure 2 is a descriptive illustration showing the heating area and the magnetic field heating coil of the heating device according to the first embodiment. Here, the heating area E of the laminated body is a region designated for heating within the laminated body. Thus, the magnetic field heating coil 22 heats at least the heating area E. When the heating area E is heated, the outer surface of the heating area E is also heated, so that the magnetic field heating coil 22 heats a region including the heating area E. The heating area E of the laminated body is rectangular in a plane orthogonal to the depth and width directions from the height direction. In the heating area E of the laminated body, the length in the depth direction (the vertical and horizontal directions) is Fig. 2) L, and the length in the latitude direction (the right-and-left direction in Fig. 2) D is orthogonal to the depth direction. With respect to such a heating area E, in order to ensure uniform heating in the heating area E, the magnetic field heating coil 22 has in Fig. 2 a first coil part 22a and a pair of second coil parts 22b.

[0027] The first coil section 22a is a linear section extending along the width direction and is located on one side of the heating area E in the depth direction. The length of the first coil section 22a in the width direction is assumed to be l1. The length l1 of the first coil section 22a is "11>D", which is greater than the length D of the heating area E in the depth direction.

[0028] The second coil sections 22 are provided on both sides of the first coil section 22a in the width direction to be continuous with the first coil section 22a. The second coil sections 22b are positioned to be inclined at a predetermined angle θ to the side of the heating area E with respect to the line segment in the width direction. Here, the predetermined angle θ is 0° < θ ≤ 90°. The predetermined angle θ is preferably 30° < 9° < 60° and is, for example, Θ = 45° in the first embodiment. The length of the second coil sections 22b is assumed to be l2. The length l2 of the second coil sections 22b is shorter than the length l1 of the first coil section 22a.

[0029] The first coil part 22a and the second coil parts 22b are symmetrical with respect to the line segment that is drawn in the depth direction at the center of the first coil part 22a in the width direction.

[0030] In one case, where the Fig. If the magnetic field heating coil 22 shown in 2 is to have a shape such that the parts are connected in a line, that is, a shape drawn with a single line, the magnetic field heating coil 22 has, for example, such a shape as in Fig. 3 shown on. Fig. Figure 3 is a schematic representation of an exemplary form of the magnetic field heating coil in Fig. 2. Regarding the magnetic field heating coil 22 of Fig. 3, the first coil section 22a is formed from two parallel conductors provided along the width direction. Of the second coil sections 22b, the second coil section 22b comprises on one side (the right side of Fig. 3) in the lateral direction, a conductor that is connected to the conductor on one side (the lower side of Fig. 3) of the first coil part 22a, a conductor which is connected to the conductor on the other side (the upper side of Fig. 3) of the first coil section 22a is connected, and a conductor connecting these conductors together. The second coil section 22b is on one side (the left side of Fig. 3) in the lateral direction includes a conductor that is connected to the conductor on one side (the lower side of Fig. 3) of the first coil part 22a, and a conductor connected to the conductor on the other side (the upper side of Fig. 3) of the first coil section 22a is connected, and these conductors are connected to the control unit 18. The conductors of the second coil sections 22b are provided to tilt and extend towards the side of the heating area E with respect to the conductors of the first coil section 22a.

[0031] The magnetic field heating coil 22 is designed in this way, which is located in Fig. 3 to have the form shown, such that the conductors forming the magnetic field heating coil 22 pass in the following sequence from the control unit 18, through the second coil section 22b on one side and the first coil section 22a, lead to the second coil section 22b on the other side, turn around, pass from the second coil section 22b on the other side, through the first coil section 22a and the second coil section 22b on one side, and lead to the control unit 18. At this point, the first coil section 22a and the second coil sections 22b allow electrical currents flowing through the two conductors to travel in opposite directions between the conductor on one side and the conductor on the other side.

[0032] Another example of the magnetic field heating coil 22 will be given next with reference to Fig. 4 described. Fig. Figure 3 is a descriptive illustration showing an example of the heating area and the magnetic field heating coil of the heating device according to the first embodiment. The magnetic field heating coil 22 in Fig. Figure 4 includes the first coil section 22a, a pair of second coil sections 22b, and a pair of third coil sections 22c. The first coil section 22a and the second coil sections 22b are the same as those in Figure 4. Fig. 2, and the description of it is omitted.

[0033] The third coil sections 22c are positioned on both sides of the first coil section 22a in the lateral direction, so that they are continuous with the first coil section 22a. The third coil sections 22c are positioned to be inclined at a predetermined angle θ to the opposite side of the heating area E with respect to the line segment in the lateral direction. In other words, the second coil sections 22b and the third coil sections 22c are sections that branch off from the first coil section 22a. Furthermore, the third coil sections 22c are positioned such that the third coil sections 22c and the second coil sections 22b are symmetrical with respect to the line segment drawn in the lateral direction on the first coil section 22a. Consequently, the predetermined angle θ formed by the third coil sections 22c is the same as the angle formed by the second coil sections 22b. It is assumed that the length of the third coil parts is 22c l3.The length l3 of the third coil parts 22c is shorter than the length l1 of the first coil part 22a and the same as the length l2 of the second coil parts 22b.

[0034] The first coil part 22a, the second coil parts 22b and the third coil parts 22c are symmetrical with respect to the line segment that is drawn in the depth direction at the center of the first coil part 22a in the width direction.

[0035] In one case, where the Fig. 4. If the magnetic field heating coil 22 shown is to have a shape such that the parts are connected in a line, that is, a shape drawn with a single line, the magnetic field heating coil 22, for example, has such a shape as shown in Fig. 5 shown on. Fig. Figure 5 is a schematic representation of an exemplary form of the magnetic field heating coil in Fig. 4. Regarding the magnetic field heating coil 22 of Fig. 5, the first coil section 22a is formed from two parallel conductors provided along the width direction. Of the second coil sections 22b, the second coil section 22b comprises the other side (the right side of Fig. 5) in the lateral direction, a conductor that is connected to the conductor on one side (the lower side of Fig. 5) of the first coil part 22a is connected, and the conductor of the second coil parts 22b is provided to extend from the conductor on one side of the first coil part 22a to the side of the heating area E, as well as to extend back towards the conductor on one side of the first coil part 22a. The second coil part 22b on one side (the left side of Fig. 5) in the lateral direction includes a conductor that is connected to the conductor on one side (the lower side of Fig. 5) of the first coil section 22a, and a conductor connected to the conductor of the third coil section 22c, and these conductors are connected to the control unit 18. The conductors of the second coil sections 22b are provided to tilt and extend towards the side of the heating area E with respect to the conductor of the first coil section 22a. The third coil sections 22c each comprise a conductor connected to the conductor on the other side (the upper side of Fig. 4) of the first coil section 22a, and the conductor of each third coil section 22c is provided to extend from the conductor on the other side of the first coil section 22a to the opposite side of the heating area E, and back towards the conductor on the other side of the first coil section 22a. The end of each conductor of the second coil sections 22b is connected to the end of each conductor of the third coil sections 22c, with the ends being on the opposite side from the ends connected to the first coil section 22a.

[0036] The magnetic field heating coil 22 is designed in this way, which is located in Fig. The conductors forming the magnetic field heating coil 22 are arranged in the following order: from the control unit 18, through the second coil section 22b on one side, the third coil section 22c on one side, the first coil section 22a, the third coil section 22c on the other side, the second coil section 22b on the other side, the first coil section 22a and the second coil section 22b on one side, and finally to the control unit 18. At this point, the first coil section 22a, the second coil sections 22b, and the third coil sections 22c allow electrical currents flowing through the conductors to travel in opposite directions. Although details will be described later, with a temperature distribution of the magnetic field heating coil 22 in Fig. 5. The uneven distribution of temperature is suppressed more than with conventional technology, which ensures uniformity.

[0037] The control unit 18 controls a magnetic field provided on the laminated body by controlling an electric current supplied by the magnetic field heating coil 22. The control unit 18 performs various control operations in the heating device 10 by carrying out arithmetic processing through an integrated circuit, such as a CPU.

[0038] When such a heating device 10 heats the laminated body placed on the mold 24, the control unit 18 supplies an electric current through the magnetic field heating coil 22, thereby generating a magnetic field from the magnetic field heating coil 22. The generated magnetic field passes through the mold 24 and is applied to the laminated body. Once the magnetic field is applied, the laminated body is cured by inductive heating in the heating area E and is formed as the composite material 20.

[0039] As described above, according to the first embodiment, in the magnetic field heating coil 22 in Fig. 2, the magnetic field heating coil 22 has the first coil part 22a and the second coil parts 22b, which allows the composite material 20 around the magnetic field heating coil 22 to be heated evenly.

[0040] Furthermore, according to the first embodiment, in the magnetic field heating coil 22 in Fig. 4, the magnetic field heating coil 22 further comprises the third coil parts 22c, which enables the composite material 20 to be heated uniformly in a larger area around the magnetic field heating coil 22. [Second embodiment]

[0041] A heating device 30 according to a second embodiment is next described with reference to Fig. 6 to Fig. 9 described. To avoid overlapping descriptions, sections that differ from those of the first embodiment are described, and sections with the same structures as those of the first embodiment are described, using the same reference numerals as in the second embodiment. Fig. Figure 6 is a descriptive illustration showing an example of a heating area and a magnetic field heating coil of the heating device according to the second embodiment. Fig. Figure 7 is a schematic view of an exemplary form of the magnetic field heating coil in Fig. 6. Fig. Figure 8 is a descriptive illustration showing another example of the heating area and the magnetic field heating coil of the heating device according to the second embodiment. Fig. Figure 9 is a schematic representation of an exemplary form of the magnetic field heating coil in Fig. 8.

[0042] In the heating device 30 of the second embodiment, a majority of the magnetic field heating coils 22 are in Fig. 2 and Fig. 4 of the first embodiment are placed by arranging them in the depth direction. In particular, in the heating device 30 of the second embodiment, they have in Fig. 6 depicted magnetic field heating coils 32 the magnetic field heating coils 22 in Fig. 2, which are provided by arranging them in the depth direction, with the heating area E sandwich-like in between. As in Fig. Figure 6 shows that of the two magnetic field heating coils 32 arranged in the depth direction, the magnetic field heating coil 32 is on one side (the upper side of Fig. 6) placed on one side of the heating area E in the depth direction, and the magnetic field heating coil 32 on the other side (the lower side of Fig. 6) is placed on the opposite side of the heating area E in the depth direction. The first coil section 22a of the magnetic field heating coil 32 on one side and the first coil section 22a of the magnetic field heating coil 32 on the other side are positioned to face each other in the depth direction. Likewise, the second coil sections 22b of the magnetic field heating coil 32 on one side and the second coil sections 22b of the magnetic field heating coil 32 on the other side are positioned to tilt towards the side of the heating area E.

[0043] In one case, where the Fig. The 6 depicted magnetic field heating coils 32 each represent the magnetic field heating coil 22 with the shape that is connected to a Fig. When the single line shown in Figure 3 is drawn, the magnetic field heating coils 32, for example, have a shape like the one shown in Figure 3. Fig. Figure 7 shows the magnetic field heating coils 32 in Fig. 7 exhibit a structure in which the magnetic field heating coils 22 are in Fig. 3 are provided on both sides in the depth direction, with the heating area E arranged sandwich-like in between. The in Fig. The magnetic field heating coils 32 shown in Figure 7 are the same as those in Figure 7. Fig. The magnetic field heating coil 22 shown in Figure 3 is omitted, as is its description. Fig. The magnetic field heating coils 32 shown in Figure 7 are both connected to the control unit 18. In other words, the conductors forming the magnetic field heating coil 32 on one side and the conductors forming the magnetic field heating coil 32 on the other side are each connected to the control unit 18.

[0044] In the heating device 30 of the second embodiment, the following features are present: Fig. 8 depicted magnetic field heating coils 32 the magnetic field heating coils 22 in Fig. 4, which are provided by arranging them in the depth direction, with the heating area E sandwich-like in between. As in Fig. Figure 8 shows that of the two magnetic field heating coils 32 arranged in the depth direction, the magnetic field heating coil 32 is on one side (the upper side of Fig. 8) placed on one side of the heating area E in the depth direction, and the magnetic field heating coil 32 on the other side (the lower side of Fig. 8) is located on the opposite side of the heating area E in the depth direction. The first coil section 22a of the magnetic field heating coil 32 on one side and the first coil section 22a of the magnetic field heating coil 32 on the other side are positioned to face each other in the depth direction. The second coil sections 22b of the magnetic field heating coil 32 on one side and the second coil sections 22b of the magnetic field heating coil 32 on the other side are also positioned to tilt towards the side of the heating area E. Furthermore, the third coil sections 22c of the magnetic field heating coil 32 on one side and the third coil sections 22c of the magnetic field heating coil 32 on the other side are positioned to tilt towards the opposite side of the heating area E.

[0045] In one case, where the Fig. The magnetic field heating coils 32 shown in the diagram are each to be the magnetic field heating coil 22 with the shape that is connected to a Fig. When the single line shown in Figure 5 is drawn, the magnetic field heating coils 32, for example, have a shape like the one shown in Figure 5. Fig. 9 shown on. The magnetic field heating coils 32 in Fig. 9 exhibit a structure in which the magnetic field heating coils 22 are in Fig. 5 are provided on both sides in the depth direction, with the heating area E in between, arranged in a sandwich-like manner. The in Fig. The 9 depicted magnetic field heating coils 32 are the same as those in Fig. The magnetic field heating coil 22 shown in Figure 5 is omitted, as is its description. Fig. The magnetic field heating coils 32 shown in Figure 9 are both connected to the control unit 18. In other words, the conductors forming the magnetic field heating coil 32 on one side and the conductors forming the magnetic field heating coil 32 on the other side are each connected to the control unit 18. Although details will be described later, a temperature distribution of the magnetic field heating coil 32 in Fig. 9. The uneven distribution of temperature is suppressed more than with conventional technology, which ensures uniformity.

[0046] As described above, according to the second embodiment, the magnetic field heating coils 32 can be placed on both sides of the heating area E in the depth direction, which can further improve the uniform heating of the heating area E in the depth direction. [Third embodiment]

[0047] A heating device 40 according to a third embodiment is next described with reference to Fig. 10 to Fig. 13 described. To avoid overlapping descriptions, sections that differ from those of the first and second embodiments are described, and sections with the same structures as those of the first and second embodiments are described, using the same reference numerals in the third embodiment as well. Fig. Figure 10 is a descriptive illustration showing an example of a heating area and a magnetic field heating coil of the heating device according to the third embodiment. Fig. Figure 11 is a schematic representation of an exemplary form of the magnetic field heating coil in Fig. 10. Fig. Figure 12 is a descriptive illustration showing another example of the heating area and the magnetic field heating coil of the heating device according to the third embodiment. Fig. Figure 13 is a schematic representation of an exemplary form of the magnetic field heating coil in Fig. 12.

[0048] In the heating device 40 of the third embodiment, a plurality of the magnetic field heating coils 32 are in Fig. 6 and Fig. 8 of the second embodiment are connected to have a shape of the parts connected in a line, that is, a shape drawn with a single line. In particular, in the heating device 40 of the third embodiment, they have in Fig. 10 depicted magnetic field heating coils 42 the magnetic field heating coils 32 in Fig. 6, which are provided by arranging them in the depth direction, with the heating area E sandwich-like in between and connected by connecting parts 22d. In Fig. 10 A pair of connecting parts 22d is provided, and the connecting parts 22d connect accordingly the second coil parts 22b of the magnetic field heating coil 42 on one side (the lower side of Fig. 10) with the second coil parts 22b of the magnetic field heating coil 42 on the other side (the upper side of Fig. 10). Although a pair of connecting parts 22d in Fig. Since 10 is provided, the number is not particularly limited, and the part can have any structure as long as the part connects the magnetic field heating coils 42.

[0049] In other words, as in Fig. Figure 10 shows the magnetic field heating coils 42, the magnetic field heating coil 42, which is located on one side (the lower side of Fig. 10) of the heating area E in the depth direction, the first coil part 22a and a pair of the second coil parts 22b are mounted. The magnetic field heating coil 42, which is on the other side (the upper side of Fig. 10) of the heating area E in the depth direction, has the first coil part 22a and a pair of the second coil parts 22b. The first coil part 22a of the magnetic field heating coil 42 on one side and the first coil part 22a of the magnetic field heating coil 42 on the other side are positioned to face each other in the depth direction. The second coil parts 22b of the magnetic field heating coil 42 on one side and the second coil parts 22b of the magnetic field heating coil 42 on the other side are also positioned to be inclined towards the side of the heating area E. The connecting parts 22d connect both the second coil parts 22b on one side and the second coil parts 22b on the other side.

[0050] In one case, where the Fig. The magnetic field heating coils 42 shown in Figure 10 are intended to have the shape that is drawn with a single line. For example, the magnetic field heating coils 42 have a shape like the one shown in Figure 10. Fig. 11 shown on. For the sections of the in Fig. 11 shown magnetic field heating coil 42, which is the same as that of the in Fig. Since the 7 depicted magnetic field heating coils 32 are, their description is omitted, and only different sections are described. Fig. 11 connects a connecting part 22d to the second coil part 22b on one side (the left side of Fig. 11) the magnetic field heating coil 42 on one side with the second coil part 22b on one side (the left side of Fig. 11) the magnetic field heating coil 42 on the other side.

[0051] On the magnetic field heating coil 42 on one side (the lower side of Fig. 11), which in Fig. As shown in Figure 11, the second coil part 22b comprises on one side (the left side of Fig. 11) a conductor connected to the conductor of the first coil part 22a on one side (the lower side of Fig. 11) is connected, and a conductor connected to the conductor of the first coil part 22a on the other side (the upper side of Fig. 11) is connected. The conductor of the second coil section 22b, which is connected to the conductor of the first coil section 22a on one side, is connected to the conductor of the connecting section 22d. Meanwhile, the conductor of the second coil section 22b, which is connected to the conductor of the first coil section 22a on the other side, is connected to the control unit 18.

[0052] On the other side of the magnetic field heating coil 42 (the upper side of Fig. 11), which in Fig. As shown in Figure 11, the second coil part 22b comprises on one side (the left side of Fig. 11) a conductor connected to the conductor of the first coil part 22a on one side (the lower side of Fig. 11) is connected, and a conductor connected to the conductor of the first coil part 22a on the other side (the upper side of Fig. 11) is connected. The conductor of the second coil section 22b, which is connected to the conductor of the first coil section 22a on one side, is connected to the conductor of the connecting section 22d. Meanwhile, the conductor of the second coil section 22b, which is connected to the conductor of the first coil section 22a on the other side, is connected to the control unit 18.

[0053] The magnetic field heating coils 42 are designed in this way, which are in Fig. The conductors forming the magnetic field heating coils 42 are arranged in the following order: from the control unit 18, through the magnetic field heating coil 42 on the other side, the connecting part 22d, and the magnetic field heating coil 42 on the other side, and lead to the control unit 18. The conductors of the magnetic field heating coil 42 on the other side, in the following order: from the control unit 18, through the second coil part 22b on one side and the first coil part 22a, lead to the second coil part 22b on the other side, turn around, go from the second coil part 22b on the other side, through the first coil part 22a and the second coil part 22b on one side, and lead to the connecting part 22d.The conductors of the magnetic field heating coil 42 on one side, in sequence from the connecting part 22d, go through the second coil part 22b on one side and the first coil part 22a, lead to the second coil part 22b on the other side, turn around, go from the second coil part 22b on the other side, through the first coil part 22a and the second coil part 22b on one side, and lead to the control unit 18.

[0054] At this point, the first coil section 22a of the magnetic field heating coil 42 on the other side allows electric currents flowing through the two conductors to travel in opposite directions between the conductor on one side and the conductor on the other side. Consequently, a magnetic field of the opposite polarity can be generated in the first coil section 22a of the magnetic field heating coil 42 on the other side. The first coil section 22a of the magnetic field heating coil 42 on one side allows electric currents flowing through the two conductors to travel in opposite directions between the conductor on one side and the conductor on the other side. Consequently, a magnetic field with the opposite polarity can be generated in the first coil section 22a of the magnetic field heating coil 42 on the other side.In other words, the connecting part 22d establishes a connection such that the electric current flowing through the magnetic field heating coil 42 on the other side and the electric current flowing through the magnetic field heating coil 42 on the one side are out of phase, which results in the magnetic field formed in the magnetic field heating coil 42 on the other side and the magnetic field formed in the magnetic field heating coil 42 on the one side having opposite polarity.

[0055] In the heating device 40 of the third embodiment, the following features are present: Fig. 12 depicted magnetic field heating coils 42 the magnetic field heating coils 32 in Fig. 8, which are provided by arranging them in the depth direction, with the heating area E sandwich-like in between, and connected by connecting parts 22d. In Fig. 12 is a pair of connecting parts 22d provided, and the connecting parts 22d connect accordingly the second coil parts 22b of the magnetic field heating coil 42 on one side (the lower side of Fig. 12) with the second coil parts 22b of the magnetic field heating coil 42 on the other side (the upper side of Fig. 12). Although in Fig. 12 a pair of connecting parts 22d is provided, the number is not particularly limited, and the part can have any structure as long as the part connects the magnetic field heating coils 42.

[0056] In other words, as in Fig. Figure 12 shows the magnetic field heating coils 42, which is located on one side (the upper side of Fig. 12) of the heating area E in the depth direction, the first coil part 22a, a pair of the second coil parts 22b and a pair of the third coil parts 22c are provided. The magnetic field heating coil 42, which is on the other side (the upper side of Fig. 12) of the heating area E in the depth direction, also includes the first coil section 22a, a pair of the second coil sections 22b, and a pair of the third coil sections 22c. The first coil section 22a of the magnetic field heating coil 42 on one side and the first coil section 22a of the magnetic field heating coil 42 on the other side are positioned to face each other in the depth direction. The second coil sections 22b of the magnetic field heating coil 42 on one side and the second coil sections 22b of the magnetic field heating coil 42 on the other side are positioned to incline towards the side of the heating area E. The third coil sections 22c of the magnetic field heating coil 42 on one side and the third coil sections 22c of the magnetic field heating coil 42 on the other side are positioned to incline towards the opposite side of the heating area E.The connecting parts 22d connect both the second coil parts 22b on one side and the second coil parts 22b on the other side.

[0057] In one case, where the Fig. The magnetic field heating coils 42 shown in Figure 12 are intended to have the shape that is drawn with a single line. For example, the magnetic field heating coils 42 have a shape like the one shown in Figure 12. Fig. 13 shown on. For the sections of the in Fig. 13 magnetic field heating coils 42 shown, which are the same as those in Fig. Since the 9 depicted magnetic field heating coils 32 are, their description is omitted, and only different sections are described. Fig. 13 A connecting part 22d connects the second coil part 22b on one side (the left side of Fig. 13) the magnetic field heating coil 42 on one side with the second coil part 22b on one side (the left side of Fig. 13) the magnetic field heating coil 42 on the other side.

[0058] On the magnetic field heating coil 42 on one side (the lower side of Fig. 13), which in Fig. As shown in Figure 13, the second coil part 22b comprises on one side (the left side of Fig. 13) a conductor connected to the conductor of the first coil part 22a on one side (the lower side of Fig. 13) is connected, and a conductor connected to the conductor of the first coil part 22a on the other side (the upper side of Fig. 13) is connected. The conductor of the second coil section 22b, which is connected to the conductor of the first coil section 22a on one side, is connected to the conductor of the connecting section 22d. Meanwhile, the conductor of the second coil section 22b, which is connected to the conductor of the first coil section 22a on the other side, is connected to the control unit 18.

[0059] On the other side of the magnetic field heating coil 42 (the upper side of Fig. 13), which in Fig. As shown in Figure 13, the second coil part 22b comprises on one side (the left side of Fig. 13) a conductor connected to the conductor of the first coil part 22a on one side (the lower side of Fig. 13) is connected, and a conductor connected to the conductor of the first coil part 22a on the other side (the upper side of Fig. 13) is connected. The conductor of the second coil section 22b, which is connected to the conductor of the first coil section 22a on one side, is connected to the conductor of the connecting section 22d. Meanwhile, the conductor of the second coil section 22b, which is connected to the conductor of the first coil section 22a on the other side, is connected to the control unit 18.

[0060] The magnetic field heating coils 42 are designed in this way, which are in Fig. The conductors forming the magnetic field heating coils 42 are arranged in the following order: from the control unit 18, through the magnetic field heating coil 42 on the other side, the connecting part 22d, and the magnetic field heating coil 42 on the other side, and lead to the control unit 18. The conductors of the magnetic field heating coil 42 on the other side, also from the control unit 18, pass through the second coil part 22b on one side, the third coil part 22c on one side, the first coil part 22a, the third coil part 22c on the other side, the second coil part 22b on the other side, the first coil part 22a, and the second coil parts 22b on one side, and lead to the connecting part 22d.The conductors of the magnetic field heating coil 42 on one side, in sequence from the connecting part 22d, pass through the second coil part 22b on one side, the third coil part 22c on one side, the first coil part 22a, the third coil part 22c on the other side, the second coil part 22b on the other side, the first coil part 22a and the second coil part 22b on one side, and lead to the control unit 18.

[0061] At this point, the first coil section 22a of the magnetic field heating coil 42 on the other side allows electric currents flowing through the two conductors to flow in opposite directions in one conductor and the other conductor. Consequently, a magnetic field of the opposite polarity can be generated between the two conductors in the first coil section 22a of the magnetic field heating coil 42 on the other side. The first coil section 22a of the magnetic field heating coil 42 on one side allows electric currents flowing through the two conductors to flow in opposite directions in one conductor and the other conductor. Consequently, a magnetic field with the opposite polarity can be generated between the two conductors in the first coil section 22a of the magnetic field heating coil 42 on one side.In other words, the connecting part 22d establishes a connection such that the electric current flowing through the magnetic field heating coil 42 on the other side and the electric current flowing through the magnetic field heating coil 42 on the one side are out of phase, which results in the magnetic field formed in the magnetic field heating coil 42 on the other side and the magnetic field formed in the magnetic field heating coil 42 on the one side having opposite polarity.

[0062] As described above, according to the third embodiment, the magnetic field heating coils 42 can be positioned to surround the heating area E, which can further improve the uniform heating of the heating area E. The magnetic field heating coils 42 can have a shape such that the parts are connected in a line, that is, a shape drawn with a single line. Thus, the magnetic field heating coils 42 can have a shape that is easily formed with a single conductor.

[0063] According to the third embodiment, because the magnetic field formed on one side of the magnetic field heating coil 42 and the magnetic field formed on the other side of the magnetic field heating coil 42 are of opposite polarity, it is possible to prevent the magnetic fields from canceling each other out, which allows the composite material 20 to be preferentially heated by the magnetic field heating coils 42.

[0064] Although the third embodiment has a structure in which the individual connecting part 22d connects the magnetic field heating coils 42 in Fig. 11 and Fig. The embodiment is not specifically limited to this connection. The way in which the magnetic field heating coils 42 are connected by the connecting parts 22d can be any connection, as long as the magnetic field formed in the magnetic field heating coil 42 on one side and the magnetic field formed in the magnetic field heating coil 42 on the other side have opposite polarities.

[0065] Next, temperature distributions between a conventional magnetic field heating coil and the magnetic field heating coil 22 of the first embodiment, as well as the magnetic field heating coil 32 of the second embodiment, are presented with reference to Fig. 14 to Fig. 17 compared. Fig. Figure 10 is a schematic representation of a magnetic field heating coil of a heating device according to a conventional technique. A Fig. The conventional magnetic field heating coil 52 shown in Figure 10 is arranged such that the conductors are placed concentrically.

[0066] Fig. Figure 15 is a descriptive representation showing the temperature distribution of a heating area heated by the magnetic field heating coil according to conventional techniques. As in Fig. As shown in Figure 15, in the temperature distribution of the heating area E, which is heated by the conventional magnetic field heating coil 52, the central area between the center and the radial outer edge is a heated area with a maximum temperature in the radial direction of the magnetic field heating coil 52. The heated area with a maximum temperature is an annular area along the circumferential direction.

[0067] Fig. Figure 16 is a descriptive illustration showing a temperature distribution of the heating area heated by the magnetic field heating coil according to the first embodiment. As in Fig. 16 shows the temperature distribution of the heating area E, which is defined by the in Fig. In the magnetic field heating coil 22 of the first embodiment, as shown in section 4, heated areas with a maximum temperature are distributed at four locations: two heated areas are formed for each side of the first coil section 22a in the width direction, and heated areas are formed on both sides over the first coil section 22a in the depth direction. When the heated areas in Fig. 12 with the heated area in Fig. 11. Compared to the uneven distribution of heated areas with a maximum temperature, the temperature distribution in Fig. 12 reduced.

[0068] Fig. Figure 17 is a descriptive illustration showing a temperature distribution of the heating area heated by the magnetic field heating coil according to the second embodiment. As in Fig. 17 shows the temperature distribution of the heating area E, which is defined by the in Fig. In the second embodiment, as illustrated in Figure 7, heated magnetic field heating coil 32, heated areas with a maximum temperature are distributed at two locations: the two heated areas are formed on both sides of the first coil section 22a in the lateral direction. The two heated areas with a maximum temperature are formed in the heating area E between the two magnetic field heating coils 32. When the heated areas in Fig. 17 with the heated areas in Fig. 15 can be compared, the uneven distribution of the heated areas with a maximum temperature in the temperature distribution in Fig. 17 reduced, and a uniformity is ensured, compared to the temperature distribution in Fig. 12. Reference symbol list 10 Heating device (the first embodiment) 18 Control unit 20 Composite material 22 Magnetic field heating coil (the first embodiment) 22a First coil section 22b Second coil part 22c Third coil section 22d connecting part 24 Form 30 Heating device (the second embodiment) 32 Magnetic field heating coil (the second embodiment) 40 Heating device (the third embodiment) 42 Magnetic field heating coil (the third embodiment) 52 Magnetic field heating coil

Claims

Heating device (10, 30, 40), comprising: a magnetic field heating coil (22, 32, 42) which inductively heats a composite material (20) by means of a magnetic field, wherein the magnetic field heating coil (22, 32, 42) comprises a first coil section (22a) provided along a first direction, a pair of second coil sections (22b) provided on both sides of the first coil section (22a) in the first direction to be continuous with the first coil section (22a), wherein the second coil sections (22b) are inclined at a predetermined angle (θ) to one side in a second direction orthogonal to the first direction with respect to the first direction, and a pair of third coil sections (22c) provided such that the third coil sections (22c) and the second coil sections (22b) are symmetrical with respect to a point on the first coil section in the first direction (22a) drawn line segment are,and the first coil part (22a) and the second coil parts (22b) are symmetrical with respect to a line segment drawn in the second direction at a midpoint of the first coil part (22a) in the first direction, wherein the composite material (20) has a length in the second direction and a length in the first direction. Heating device (10, 30, 40) according to claim 1, wherein a heating target of the magnetic field heating coil (22, 32, 42) is a predetermined heating area (E) of the composite material (20), the heating area (E) has a length L in a second direction, and a length D in a first direction orthogonal to the second direction, wherein in the magnetic field heating coil (22, 32, 42), the second coil parts (22b) are inclined by a predetermined angle (θ) to the side of the heating area (E) with respect to the first direction, the predetermined angle being 0° < 9° < 90°, where θ is the predetermined angle, the first coil part (22a) has a length 11 in the first direction, and the length l1 of the first coil part (22a) is greater than the length D of the heating area (E): 11 > D. Heating device (30, 40) according to claim 2, wherein the magnetic field heating coil is each of a plurality of magnetic field heating coils (32, 42) provided by arranging them in the second direction. Heating device (40) according to claim 3, further comprising a connecting part (22d) which connects the plurality of magnetic field heating coils (42) provided by arranging them in the second direction. Heating device (40) according to claim 4, wherein the connecting part (22d) establishes a connection such that an electric current flowing through one of the magnetic field heating coils (42) adjacent in the second direction and an electric current flowing through the other magnetic field heating coil (42) adjacent in the second direction are out of phase.

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