Induction heating coil

Abstract

To provide an induction heating coil 1 capable of preventing excessive temperature rise of a power receiving member 3.SOLUTION: The induction heating coil 1 is connected to power transmission members 100, 101 of a power supply device to receive power supply from the power supply device and induction-heats a workpiece, and includes an induction heating part 6 contributing to heat generation of the workpiece and a power receiving member 3 connected to the induction heating part, and the power receiving member 3 has a holding region 30, and the holding region 30 is brought into contact with the power transmission members 100, 101 in a state of being directly or indirectly pressed. A cooling path 10 through which a cooling liquid flows is provided in the power receiving member 3, and the cooling path 10 surrounds a certain region.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an induction heating coil for induction heating of steel materials. [Background technology]

[0002] Patent Document 1 discloses an induction heating coil for induction heating a steel product (hereinafter referred to as a workpiece). The induction heating coil disclosed in Patent Document 1 has a current receiving member and a coil section. The coil section has an induction heating section that contributes to heat generation in the workpiece and a lead section that connects to the induction heating section. The induction heating section and the lead section are both square tubular, and a series of cooling paths are formed inside. The cooling paths are pipes through which a coolant flows.

[0003] The current receiving member disclosed in Patent Document 1 has an insulating member sandwiched between two rectangular current receiving plates. In the induction heating coil disclosed in Patent Document 1, a portion of the lead portion is joined to the surface of the current receiving member (current receiving plate). In the induction heating coil disclosed in Patent Document 1, the portion of the lead portion that contacts the surface of the current receiving member (current receiving member joint) is linear. Furthermore, the lead portion is joined only to an area on one end of the current receiving member, and the lead portion is not connected to an area on the other end of the current receiving member. In other words, in the induction heating coil disclosed in Patent Document 1, the current receiving member joint of the lead portion is limited to an area on one end of the current receiving member, and the lead portion is not connected to an area on the other end.

[0004] In the induction heating coil disclosed in Patent Document 1, a current receiving member is connected to a power supply device to pass current through the coil portion. During induction heating, a coolant is passed through the cooling path to prevent the coil portion from excessively increasing in temperature. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-87508 Summary of the Invention [Problem to be solved by the invention]

[0006] Induction heating coils are supplied with power by connecting a current receiving member to a power transmitting member of a power supply device. Therefore, when current is applied, not only the coil but also the current receiving member rises in temperature due to Joule heat. In the induction heating coil disclosed in Patent Document 1, a portion of the lead is joined to the surface of the current receiving plate, and a coolant is passed through the lead, thereby suppressing the temperature rise of the current receiving member to some extent.

[0007] However, in an induction heating coil through which a large current flows, the current receiving member may not be sufficiently cooled, and improvements have been desired. In the induction heating coil disclosed in Patent Document 1, the lead portion is joined only to one end of the current receiving member, and no lead portion is connected to the other end of the current receiving member, so if lead portions are also provided in the other end of the current receiving member, an improvement in the cooling effect can be expected. In other words, if the joint portion of the lead portion to the current receiving member is expanded to cover the entire area of ​​the current receiving member, the temperature rise of the current receiving member can be suppressed.

[0008] However, the area on the other end of the power receiving member is a holding area with which the power transmitting member of the power supply device comes into direct or indirect contact. The holding area functions as a terminal, and it is important that the resistance of the contact surface is low. Therefore, the holding area needs to be in surface contact with the power transmitting member, and the contact is made while being pressed firmly against the power transmitting member.

[0009] On the other hand, the lead portion is tubular and hollow, so it has low rigidity against compressive force. Therefore, if the lead portion is provided in the holding area, it will be crushed when pressed hard against the power transmission member. Furthermore, if the lead portion is provided in the holding area, the lead portion will create irregularities on the surface of the holding area, making it difficult to ensure a sufficient contact area with the power transmission member of the power supply device.

[0010] The present invention is intended to solve the above-mentioned problems of the prior art, and has as its object to provide an induction heating coil that can prevent the temperature of the current receiving member from rising excessively. [Means for solving the problem]

[0011] An embodiment for solving the above-mentioned problems is an induction heating coil that is connected to a power transmission member of a power supply device, receives power from the power supply device, and induction heats a workpiece, the induction heating coil having an induction heating section that contributes to the heat generation of the workpiece and a power receiving member connected to the induction heating section, the power receiving member having a holding area, and the power transmission section being in contact with the holding area while being pressed directly or indirectly against the holding area, the induction heating coil being characterized in that a cooling path through which a coolant flows is provided in the power receiving member, and the cooling path surrounds a certain area.

[0012] In the induction heating coil of this embodiment, a cooling path is provided in the current receiving member, and the cooling path surrounds a certain area. In the induction heating coil disclosed in Patent Document 1, the cooling path provided in the current receiving member is linear, whereas in the induction heating coil of this embodiment, the cooling path surrounds a certain area. Therefore, the contact area between the cooling path and the current receiving member is large, and the current receiving member can be cooled efficiently.

[0013] Another aspect for solving a similar problem is an induction heating coil that is connected to a power transmission member of a power supply device, receives power from the power supply device, and induction heats a workpiece, the induction heating coil having an induction heating section that contributes to heating the workpiece and a power receiving member that is connected to the induction heating section, the power receiving member having a holding area, and the power transmission section being in contact with the holding area while being pressed directly or indirectly against the holding area, the power receiving member having a cooling path through which a coolant flows, and the cooling path having multiple bends of 80 degrees or more.

[0014] In the induction heating coil of this embodiment, the cooling path has multiple curved portions at large angles and occupies a certain area, which increases the contact area between the cooling path and the current receiver member, allowing the current receiver member to be cooled efficiently.

[0015] In each of the above-described aspects, it is desirable that a part or all of the cooling passage is located in a region other than the holding region.

[0016] According to this aspect, unevenness is unlikely to occur in the holding area.

[0017] In each of the above aspects, it is desirable that part or all of the cooling passage is in the holding region.

[0018] According to this aspect, it is possible to directly cool the area that is most likely to generate heat.

[0019] In each of the above-described aspects, it is desirable that a cooling path component plate is provided in part or all of the holding area, and that the cooling path component plate is provided with grooves or communication passages to form part or all of the cooling path.

[0020] According to this aspect, the surface of the holding area is less likely to become uneven, and the area that is most likely to generate heat can be directly cooled.

[0021] In each of the above-described aspects, it is desirable that a communication passage be provided inside the holding region to constitute part or all of the cooling passage.

[0022] According to this aspect, the holding area is less likely to become uneven, and the area that is most likely to generate heat can be directly cooled. [Effects of the Invention]

[0023] The induction heating coil of the present invention can prevent the temperature of the current receiving member from rising excessively, and has the effect of suppressing deterioration of the induction heating coil and extending its lifespan. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 2 is a perspective view of an induction heating coil and a power transmission member of a power supply device according to an embodiment of the present invention. [Figure 2] 2 is a front view of the induction heating coil of FIG. 1 connected to a power transmission member of a power supply device. [Figure 3] FIG. 2 is an exploded perspective view of a current receiving member of the induction heating coil of FIG. [Figure 4] FIG. 2 is a front view of a current receiving member of the induction heating coil of FIG. [Figure 5] FIG. 10 is a front view of a current receiving member of an induction heating coil according to another embodiment of the present invention. [Figure 6] FIG. 10 is a front view of a current receiving member of an induction heating coil according to still another embodiment of the present invention. [Figure 7] 10(a) is a front view of a current receiving member of an induction heating coil according to still another embodiment of the present invention, and FIG. 10(b) is a side view thereof. [Figure 8] FIG. 8 is an exploded perspective view of the current receiving member of the induction heating coil of FIG. 7. [Figure 9] 10(a) is a front view of a current receiving member of an induction heating coil according to still another embodiment of the present invention, and FIG. 10(b) is a side view thereof. [Figure 10] 9. (a) is a cross-sectional view taken along line AA in FIG. 9, (b) is a cross-sectional view taken along line BB in FIG. 9, and (c) is a cross-sectional view taken along line CC in FIG. [Figure 11] FIG. 10 is a cross-sectional view taken along the line DD in FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0025] The following describes embodiments of the present invention, but the invention described in the claims is not limited to the embodiments described below. First, an outline of the induction heating coil 1 and its peripheral devices will be described. The induction heating coil 1 of this embodiment is attached to a power supply device (not shown), receives a high-frequency current from the power supply device, and performs high-frequency induction heating and hardening of a steel workpiece.

[0026] The power supply device is a known device and includes a high frequency oscillator and a transformer. 1 and 2, the power supply device has a pair of power transmitting members 100, 101. The induction heating coil 1 has a power receiving member 3, as will be described later, and the power receiving member 3 is placed between the pair of power transmitting members 100, 101. In this embodiment, as shown in FIG. 2, the power receiving member 3 is sandwiched between a pair of power transmitting members 100 and 101, and the power transmitting member 100, the power receiving member 3, and the power transmitting member 101 are clamped together by a vise-like clamp 110 having a screw 103.

[0027] The pair of power transmission members 100, 101 are in contact with and pressed against a holding area 30 that is part of the power reception member 3. The holding area 30 is a rectangular area surrounded by a dashed line in FIG. The induction heating coil 1 is connected to power transmission members 100, 101 of a power supply device, receives power from the power supply device, and induction heats the workpiece.

[0028] Next, the configuration of the induction heating coil 1 will be described. The induction heating coil 1 of this embodiment, like known induction heating coils, has a coil portion 2 and a current receiving member 3. The coil portion 2 has an induction heating portion 6 that contributes to heat generation in the workpiece, and lead portions 7 and 8 connected to the induction heating portion 6.

[0029] The coil section 2 is made of a good conductor such as copper or a copper alloy and is composed of a hollow wire member with a rectangular cross section. A coolant (cooling water) can be passed through the inside of the induction heating coil 1, which is made of a hollow wire member, to suppress the temperature rise of the coil itself during induction heating. In other words, the entire induction heating coil 1 is made of a square tube, and a series of cooling paths 10 are formed inside.

[0030] The coil section 2 of the induction heating coil 1 of this embodiment, including the lead sections 7, 8 and the induction heating section 6, can be considered to be a single square tube, with couplers (water inlet / outlet) 15 provided at both ends. As described above, the coil section 2 of this embodiment can be considered to be a single square tube, and the internal cooling path 10 is in series and is a single line. That is, in the coil section 2 employed in this embodiment, coolant is introduced through one coupler (water inlet / outlet) 15, passes through the inside of the coil section 2, and is discharged from the other coupler (water inlet / outlet) 15.

[0031] In the induction heating coil 1 of this embodiment, the internal cooling passage 10 is a simple serial water passage, with no junctions or branching sections. For ease of understanding, this embodiment illustrates a cooling passage with a simple serial configuration, but the structure of the cooling passage is not limited to this embodiment and may be one with multiple rows or one with branching or junction sections. There are also induction heating coils with three or more water inlets and outlets.

[0032] As described above, the coil section 2 has the induction heating section 6 that contributes to the heat generation of the workpiece, and the lead sections 7 and 8 that are connected to the induction heating section 6. The induction heating coil 1 of this embodiment is a semi-open coil, and the induction heating section 6 itself has a known structure. The lead portions 7 and 8 are connected to the induction heating portion 6 both electrically and as a cooling path. That is, a coupler 15 is provided at one end of the lead portion 7, the other end of the lead portion 7 is connected to one end of the induction heating portion 6, the other end of the induction heating portion 6 is connected to the lead portion 8, and the other coupler 15 is attached to the lead portion 8.

[0033] Next, the current receiver member 3 will be described. The current receiver member 3 employed in this embodiment has a plate shape with a pentagonal front view. 2 and 3, the current receiving member 3 is composed of two pentagonal current receiving plates 20 and 21 and a pentagonal insulating plate 22. The current receiving plates 20 and 21 are made of copper or a copper alloy and have low electrical resistance. The current receiving member 3 is made up of two current receiving plates 20 and 21 bonded together with an insulating plate 22 sandwiched therebetween. The insulating plate 22 is slightly larger than the current receiving plates 20 and 21.

[0034] In the induction heating coil 1, parts of the lead portions 7 and 8 are joined to the surfaces of the incoming plates 20 and 21, as shown in FIGS. In this embodiment, the portions of the lead portions 7 and 8 that are joined to the surfaces of the receiving plates 20 and 21 (hereinafter referred to as receiving member joint portions 31) are bent in a complex manner as shown in Figures 1 to 4, and occupy a certain area. 1 to 4, all of the current receiving member joints 31 are outside the holding area 30. As described above, the holding area 30 is the area where the current transmitting members 100, 101 are in contact with each other.

[0035] The following describes the layout of the current receiving member joint 31 of the induction heating coil 1. In the following description, as shown in Fig. 4, the horizontal direction of the drawing is defined as the X direction, and the vertical direction of the drawing is defined as the Y direction. 4, the current receiver member joint 31 has five curved portions 35a to 35e and six straight portions 37a to 37f, which surround a substantially rectangular area 41. That is, the current receiver member joint 31 has a first straight portion 37a extending in the Y direction from the pentagonal protruding end 42 of the current receiver plates 20, 21 along the center of the current receiver member 3, a second straight portion 37b extending to the left in the X direction via the first 90-degree curved portion 35a, a third straight portion 37c extending upward in the Y direction via the second 90-degree curved portion 35b, a fourth straight portion 37d extending to the right in the X direction via the third 90-degree curved portion 35c, a fifth straight portion 37e extending downward in the Y direction via the fourth bent portion 35d at approximately 90 degrees, and a sixth straight portion 37f extending left in the X direction via the fifth bent portion 35e at approximately 90 degrees. These components form a rectangular enclosure around most of the incoming plates 20 and 21 except for the holding area 30, occupying a large area. That is, although there are some missing parts in the induction heating coil 1, the second straight portion 37b, the third straight portion 37c, the fourth straight portion 37d, and the fifth straight portion 37e surround an approximately rectangular area, and most of the coil 1 except for the holding area 30 is surrounded.

[0036] In the induction heating coil 1 of this embodiment, as shown in FIG. 2, a power receiving member 3 is sandwiched between a pair of power transmitting members 100 and 101, and the three are clamped together by a clamp 110. Here, in the induction heating coil 1 of this embodiment, the current receiving member joint 31 of the lead portions 7 and 8 is located in an area other than the holding area 30, so even if the current receiving member 3 is pressed between a pair of current transmitting members 100 and 101 by the clamp 110, the lead portions 7 and 8 do not get in the way and the internal cooling path 10 is not crushed.

[0037] Furthermore, according to this embodiment, the current receiver 3 is provided with a cooling path 10 formed by the lead portions 7 and 8, and the cooling path 10 surrounds a substantially rectangular area 41 on the surface of the current receiver 3. The cooling path 10 also has multiple curved portions 35a to 35e, occupying a considerable area on the surface of the current receiver 3. Therefore, the current receiver member 3 is cooled efficiently and an excessive temperature rise is suppressed.

[0038] Next, an induction heating coil 50 according to a second embodiment will be described with reference to FIG. In the following description of the embodiment, the same components as those in the previous embodiment or components that perform the same functions as those in the previous embodiment will be assigned the same numbers in the drawings to avoid redundant description. The induction heating coil 50 of the second embodiment has a cooling path formed by a cooling pipe 51 in addition to the lead portions 7 and 8. The induction heating coil 50 of the second embodiment has a cooling pipe 51 separate from the lead portions 7 and 8, and the cooling pipe 51 is joined to the surface of the current receiving member 3. The cooling pipe 51 has a rectangular cross section, and a coolant flows inside.

[0039] In the induction heating coil 50 of this embodiment, the cooling pipe 51 is installed so as to surround the holding area 30 in a square shape. In the induction heating coil 50 , the cooling path 52 formed by the cooling pipe 51 is also located outside the holding area 30 . The layout of the cooling pipes 51 will be described below.

[0040] The layout of the cooling pipe 51 is as shown in FIG. 5, and includes six curved portions 53a to 53f and seven straight portions 55a to 55g, surrounding the holding area 30, which is a substantially rectangular area. That is, the cooling pipe 51 has a first straight portion 55a extending in the X direction from one vertical side portion 56 of the pentagon of the current receiving plates 20, 21 along the center of the current receiving member 3, a second straight portion 55b extending upward in the Y direction via a first bend 53a at approximately 90 degrees, a third straight portion 55c extending to the left in the X direction via the second bend 53b at approximately 90 degrees, a fourth straight portion 55d extending downward in the Y direction via the third bend 53c at approximately 90 degrees, a fifth straight portion 55e extending to the right in the X direction via the fourth bend 53d at approximately 90 degrees, a sixth straight portion 55f extending upward in the Y direction via the fifth bend 53e at approximately 90 degrees, and a seventh straight portion 55g extending to the left in the X direction via the sixth bend 53f at approximately 90 degrees. These surround the entire holding area 30 in a rectangular shape.

[0041] In the induction heating coil 50 of this embodiment, the power receiving member 3 is sandwiched between a pair of power transmitting members 100 and 101, and the three are clamped together by a clamp 110. Here, in the induction heating coil 50 of this embodiment, the cooling pipe 51 is located in the area excluding the holding area 30, so even if the power receiving member 3 is pressed between the pair of power transmitting members 100, 101 by the clamp 110, the cooling pipe 51 does not get in the way and the internal cooling path 52 is not crushed. Furthermore, according to this embodiment, the current receiver 3 is provided with a cooling path 52 formed by a cooling pipe 51, and the cooling path 52 surrounds the holding area 30 of the current receiver 3. The cooling path 52 also has multiple curved portions 53a to 53f, occupying a considerable area on the surface of the current receiver 3. Therefore, the current receiver member 3 is cooled efficiently and an excessive temperature rise is suppressed.

[0042] In the induction heating coil 50 of the second embodiment, the cooling pipe 51 is installed so as to surround substantially the entire circumference of the holding area 30 in a square, but as in the induction heating coil 57 shown in Fig. 6, the cooling pipe 51 may be arranged in a concave shape so as to surround three sides of the holding area 30. The number of straight portions of the cooling pipe 51 is not limited, and may be one or two.

[0043] Next, an induction heating coil 60 according to a third embodiment will be described with reference to FIGS. In the induction heating coil 60 of the third embodiment, a cooling path 62 formed by a cooling path forming plate 61 is connected to a part of the cooling path 10 formed by the lead portions 7 and 8. In the induction heating coil 60 of this embodiment, a cooling path forming plate 61 is attached to an area corresponding to the holding area 30. That is, the current receiving member 3 is composed of main body portions 58a and 58b and cooling path forming plates 61a and 61b. The cooling path forming plate 61 is a square plate, and has a groove 63 formed on one surface thereof. The layout of the groove 63 is U-shaped, and three straight grooves 65a, 65b, and 65c are provided parallel to the three sides of the cooling path forming plate 61 and are connected by two curved portions 66a and 66b. The groove 63 is open to one side 67 of the cooling path forming plate 61. That is, a first opening 68 and a second opening 70 of the groove 63 are provided on the side 67 of the cooling path forming plate 61. The cooling path forming plates 61a and 61b are integrally joined to the surfaces of the main bodies 58a and 58b in areas corresponding to the holding areas 30.

[0044] Parts of the leads 7 and 8 and a cooling pipe 72 are joined to the main body 58 . The lead portions 7, 8 have a first straight portion 37a extending in the Y direction from the pentagonal tip 42 of the receiving plates 20, 21 along the center of the receiving member 3, a second straight portion 37b extending to the right in the X direction via the first bent portion 35a at an angle of approximately 90 degrees, and a third straight portion 37c extending upward in the Y direction via the second bent portion 35b at an angle of approximately 90 degrees. The cooling pipe 72 has a first straight portion 73a extending downward in the Y direction, and a second straight portion 73b extending leftward in the X direction after passing through a first bent portion 75a at an angle of approximately 90 degrees.

[0045] As described above, the cooling path component plate 61 is attached to the area corresponding to the holding area 30, and the groove 63 formed in the cooling path component plate 61 opens to the side 67 of the cooling path component plate 61 (first opening 68, second opening 70). The third straight portions 37 c of the lead portions 7 and 8 are connected to the first opening 68 of the cooling path forming plate 61 . Furthermore, a cooling pipe 72 is connected to the second opening 70 of the cooling path forming plate 61 . Therefore, a part of the lead portions 7, 8, the groove 63 of the cooling path forming plate 61 and the cooling pipe 72 are connected in series, and a series of cooling paths 10, 62 are formed. In the induction heating coil 60 of this embodiment, a cooling path 62 is provided in an area corresponding to the holding area 30 of the main body 58, and the cooling path 62 in this area is configured by a groove 63 provided in a rectangular cooling path component plate 61. In the induction heating coil 60 of this embodiment, the cooling path component plate 61 becomes the holding area 30.

[0046] In the induction heating coil 60 of this embodiment, the power receiving member 3 is sandwiched between a pair of power transmitting members 100 and 101, and the three are clamped together by a clamp 110. Here, the induction heating coil 60 of this embodiment has a cooling path 62 in the area corresponding to the holding area 30, and the cooling path 62 is formed by a groove 63 engraved in a cooling path forming plate 61.

[0047] In the induction heating coil 60, the cooling path component plate 61 is clamped by the clamps 110, but because the cooling path component plate 61 is a plate, the clamping force of the clamps 110 is dispersed and no excessive load is applied to the cooling path 62 of the cooling path component plate 61. Therefore, even if the pair of power transmitting members 100, 101 are pressed against the power receiving member 3 by the clamps 110, the internal cooling path 62 will not be crushed. Furthermore, according to this embodiment, the current receiver 3 is provided with a cooling path 62 formed by a groove 63 in a cooling path forming plate 61, and the cooling path 62 surrounds a certain area of ​​the holding region 30 of the current receiver 3. The cooling path 10 also has multiple curved portions 35a, 35b, 66a, 66b, 75a, occupying a considerable area of ​​the surface of the current receiver 3. Therefore, the current receiver member 3 is cooled efficiently and an excessive temperature rise is suppressed.

[0048] In the induction heating coil 60 described above, the cooling path forming plate 61 is provided in the holding area 30 of the main body 58, but a larger cooling path forming plate 61 may be attached to the main body 58. For example, a holding area 30 of the same size as the main body 58 may be used, and the cooling path may be laid out on the front surface of the current receiving member 3. Delete 2 lines

[0049] Furthermore, for example, by three-dimensional shaping, such as lamination molding, the current receiver member 3 itself may be provided with communication passages 76 to form a cooling path. 9 and 10 show an induction heating coil 71 in which a communication passage 76 is provided inside the current receiver member 3 by three-dimensional molding, and a cooling path is laid out throughout. In the induction heating coil 71 of this embodiment, the cooling path 10 also surrounds a certain area of ​​the holding region of the current receiver member 3. The cooling path 10 also has multiple curved portions 77a to 77e and straight portions 78a to 78f, occupying a considerable area of ​​the surface of the current receiver member 3. Therefore, the current receiver member 3 is cooled efficiently and an excessive temperature rise is suppressed.

[0050] In the above-described embodiments, the bent portions all change the flow of the coolant at right angles, but this embodiment is not limited to this configuration, and the bent portions may be arc-shaped. In the above embodiment, the angle change of the straight portions before and after the curved portion is 90 degrees, but it is desirable that this angle change be 80 degrees or more. In the above embodiment, the opening angle of the straight portions (the angle on the smaller side) is 90 degrees (the larger side is 270 degrees), but it is desirable that this opening angle (the angle on the smaller side) be 100 degrees or more (the larger side is 260 degrees or less). The angle of the straight portion may be changed by nearly 360 degrees, and the straight portions before and after the bend may be made substantially parallel. This may be repeated to form a zigzag layout for the cooling path.

[0051] In the implementation process described above, the current receiving member 3 is clamped between a pair of current transmitting members 100, 101 using a vise-shaped clamp 110, but the method of connecting the current transmitting members 100, 101 and the current receiving member 3 is arbitrary. For example, a screw shaft may be erected on the current receiving member 3, a through hole may be formed on the current transmitting members 100, 101, and the screw shaft may be passed through the through hole and a nut may be engaged from the outside to press the current transmitting member against the holding area.

[0052] The inventions according to the embodiments described above can be substituted or combined as long as no contradiction occurs. Furthermore, the above-described embodiments can be freely substituted or added to each other in terms of components as long as they fall within the technical scope of the present invention. [Explanation of symbols]

[0053] 1, 50, 57, 60, 71: induction heating coil, 2: coil portion, 3: current receiving member, 6: induction heating section, 7, 8: lead section, 10: cooling path, 20, 21: receiving plate, 22: insulating plate, 30: holding area, 31: current receiving member joint, 100: current transmitting member, 101: Power transmission components

Claims

1. An induction heating coil is connected to a power transmission member of a power supply device to receive power from the power supply device and to induction heat a workpiece, the induction heating coil having an induction heating part that contributes to heat generation of the workpiece and a power receiving member connected to the induction heating part, the power receiving member having a holding area, and the power transmission part being in contact with the holding area while being pressed directly or indirectly against the holding area, An induction heating coil, characterized in that a cooling passage through which a coolant flows is provided in a current receiving member, and the cooling passage surrounds a certain area.

2. An induction heating coil is connected to a power transmission member of a power supply device to receive power from the power supply device and to induction heat a workpiece, the induction heating coil having an induction heating part that contributes to heat generation of the workpiece and a power receiving member connected to the induction heating part, the power receiving member having a holding area, and the power transmission part being in contact with the holding area while being pressed directly or indirectly against the holding area, 1. An induction heating coil, comprising: a current receiving member provided with a cooling passage through which a coolant flows, the cooling passage having a plurality of bends of 80 degrees or more.

3. 3. The induction heating coil according to claim 1, wherein a part or all of the cooling passage is located outside the holding area.

4. 3. The induction heating coil according to claim 1, wherein a part or all of the cooling path is located in the holding region.

5. 3. An induction heating coil according to claim 1, wherein a cooling path forming plate is provided in part or all of the holding area, and a groove or a communication passage is provided in the cooling path forming plate to form part or all of the cooling path.

6. 3. The induction heating coil according to claim 1, wherein a communication passage is provided inside the holding region and constitutes a part or all of the cooling passage.

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