JP2017199613A - Induction heating coil unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow for efficient cooling of a heating coil without cooling a heating object, while facilitating the handling.SOLUTION: An induction heating coil unit 1 includes a heating coil 20 for induction heating a heating object, and a case 30 for housing the heating coil. The case has a supply port 151 for interconnecting the inside and outside of the case and supplying the cooling gas, supplied from the outside of the case, into the case, an exhaust port 152 for interconnecting the inside and outside of the case and exhausting the cooling gas, supplied from the supply port into the case, to the outside of the case, and cooling paths 341, 342 formed between the case and heating coil, and connecting the supply port and exhaust port.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to an induction heating coil unit and an induction heating system.

  In recent years, an induction heating method has become widespread as a method for heating an object to be heated. The induction heating method is a heating method in which a heating object is heated by flowing a high-frequency current through a heating coil disposed in the vicinity of the heating object and generating an eddy current in the heating object by electromagnetic induction. The induction heating method is characterized in that a heating object that is physically non-contact and electrically non-connected can be heated at high speed and with high efficiency. In addition, in the induction heating method, the entire heating object having a complicated shape can be uniformly and efficiently heated by matching the shape of the heating coil with the heating object.

  In such an induction heating method, a heating target can be heated to a high temperature at a high speed by passing a high-output high-frequency current through the heating coil. However, in this case, there is a problem that the temperature of the heating coil itself rises due to the influence of self-heating of the heating coil and radiant heat received from the object to be heated. Therefore, in the induction heating method, it is necessary to cool the heating coil so as not to exceed the heat resistance temperature of the winding of the heating coil.

  Therefore, in the conventional configuration, for example, a cooling method using a cooling fan or a water-cooled tube is adopted. For example, in a cooling method using a cooling fan, the heating coil is cooled by applying cooling air from the cooling fan to the entire heating coil. However, in this cooling system, the cooling air from the cooling fan hits the object to be heated, and the object to be heated is also cooled. In the case of using a water-cooled tube, the heating coil is constituted by a water-cooled tube such as a copper tube, and the heating coil is cooled by passing cooling water into the copper tube. However, in this cooling method, since the copper tube has to be processed into a coil shape, it is difficult to make the heating coil in a shape that matches the object to be heated, and thus it is difficult to uniformly heat the object to be heated. Moreover, in this cooling system, since it cools using water, the danger of an electrical leakage increases. Thus, the conventional cooling system has various problems.

  In the conventional configuration, the heating coil is integrated into the apparatus. For this reason, it is difficult to remove the heating coil from the apparatus for maintenance of the heating coil, or to divert the removed heating coil to another apparatus.

JP 2002-208468 A JP 2012-2104040 A

  The embodiments of the present invention have been made in view of the above circumstances, and the purpose thereof is to efficiently cool the heating coil without cooling the object to be heated, and further to the induction heating coil unit that is easy to handle. And it is providing the induction heating system using the induction heating coil unit.

  The induction heating coil unit according to the embodiment includes a heating coil that heats an object to be heated by induction heating, and a case that houses the heating coil. The case communicates the inside and outside of the case with a supply port for supplying cooling gas supplied from the outside of the case into the case, and communicates the inside and outside of the case with the supply. A discharge port for discharging the cooling gas supplied from the opening into the case to the outside of the case, and the supply port and the discharge port formed between the case and the heating coil. And a cooling path.

The top view which shows the induction heating coil unit by 1st Embodiment FIG. 1 is a developed sectional view taken along line X2-O-X2 of FIG. Sectional drawing shown along the X3-X3 line of FIG. 1 about 1st Embodiment The top view which shows a heating coil about 1st Embodiment Sectional drawing which shows center part periphery of an induction heating coil unit about 1st Embodiment The figure which shows an example of an induction heating system conceptually about 1st Embodiment. Flow chart showing cooling control performed by the control device in the first embodiment. The top view which shows the induction heating coil unit formed in the rectangular shape about the modification of 1st Embodiment. The top view which shows a rectangular-shaped heating coil about the modification of 1st Embodiment. The top view which shows the induction heating coil unit by 2nd Embodiment FIG. 10 is a developed sectional view taken along line X11-O-X11 in FIG. 10 for the second embodiment. Sectional drawing which shows 2nd Embodiment along the X12-X12 line | wire of FIG. Sectional drawing which shows notionally the metal mold | die apparatus incorporating the induction heating coil unit by 2nd Embodiment. The top view which fractures | ruptures and shows a part of induction heating coil unit by 3rd Embodiment The top view which fractures | ruptures and shows a part of induction heating coil unit by 4th Embodiment Sectional drawing which shows the induction heating coil unit by 5th Embodiment Plan sectional view taken along line X17-X17 in FIG. 16 for the fifth embodiment Sectional drawing which shows the induction heating coil unit by 6th Embodiment FIG. 18 is a cross-sectional plan view taken along line X19-X19 in FIG. Sectional drawing which shows the induction heating coil unit by 7th Embodiment

  Hereinafter, a plurality of embodiments of the present invention will be described. In each embodiment, substantially the same components are denoted by the same reference numerals and description thereof is omitted.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
[Configuration of induction heating coil unit]
First, the configuration of the induction heating coil unit 1 according to the first embodiment will be described. As shown in FIGS. 1 to 3, the induction heating coil unit 1 includes a heating coil 20 and a case 30. The induction heating coil unit 1 is unitized by housing the heating coil 20 in a case 30. The induction heating coil unit 1 can heat the heating object 90 in a contact or non-contact state. In this case, the heating object 90 is arranged in a state where a predetermined distance L is maintained with respect to the induction heating coil unit 1 by a regulating member or the like (not shown). The predetermined distance L is 0 mm or more.

  In the following description, the heating object 90 side with respect to the induction heating coil unit 1 is the front side of the induction heating coil unit 1 or the heating coil 20, and the induction heating coil unit 1 is opposite to the heating object 90. Is the back side of the induction heating coil unit 1 or the heating coil 20. Moreover, in this embodiment, "plan view" means the state which looked at the induction heating coil unit 1 or the heating coil 20 from the surface side.

  The heating coil 20 is driven by receiving a high-frequency current from the outside, and heats the heating object 90 by induction heating. The heating coil 20 is a single-layer or multi-layer coil, and is formed by, for example, winding a winding composed of a conductive wire such as a copper wire or an aluminum wire a plurality of times in a spiral shape. In this case, single-layer winding means that the winding layer is composed of one layer in the thickness direction of the heating coil 20. Multi-layer winding means that the winding layer is composed of a plurality of layers in the thickness direction of the heating coil 20.

  In the case of the present embodiment, the heating coil 20 is a multi-layer coil in which, for example, a conductor having a diameter of about 0.05 mm to 0.5 mm is a stranded wire, and a bundle of a plurality of the stranded wires is used as a winding. is there. According to this, the surface area of the winding of the heating coil 20 can be increased. Therefore, when a high frequency current flows through the heating coil 20, an increase in effective resistance due to the skin effect can be suppressed, and as a result, the output efficiency of the heating coil 20 can be improved.

  In addition, the coil | winding which forms the heating coil 20 is not restricted to a strand wire, You may be comprised by one conducting wire. The windings forming the heating coil 20 are generally made of insulated conductors and are covered with an insulating film. Moreover, in this embodiment, as shown in FIG.1 and FIG.4, the heating coil 20 is circular, Comprising: The hollow part 201 is formed in the center part of the annular | circular shape. The hollow portion 201 is formed so as to penetrate the central portion of the heating coil 20 in a circular shape in the thickness direction.

  As shown in FIG. 4 and the like, the heating coil 20 has a lead wire 22 that is the start of winding of the heating coil 20 and a lead wire 23 that is the end of winding. The lead wire 22 at the start of winding is drawn out from the inner peripheral side of the heating coil 20, that is, from the hollow portion 201 side and from the back side of the heating coil 20. The winding end lead wire 23 is drawn from the outer peripheral side of the heating coil 20 and from the surface side of the heating coil 20. In this embodiment, when the lead wires 22 and 23 are distinguished, the lead wire 22 at the start of winding is referred to as a start-side lead wire 22 and the lead wire 23 at the end of winding is referred to as a terminal-side lead wire 23. Connection terminals such as crimp terminals (not shown) are provided at the ends of the lead wires 22 and 23, respectively. And the connection terminal which is not shown in figure is connected to the power supply device 41 as shown, for example in FIG.

  As shown in FIGS. 2 and 3, the heating coil 20 is accommodated in the case 30. The case 30 is made of a material having electrical insulation and heat resistance, for example, a non-metallic material such as ceramic or resin. The heat resistance temperature of the case 30 is preferably higher than the heat resistance temperature of the heating coil 20. The case 30 is configured by combining a first case 31 and a second case 32, and has an accommodation space in which the heating coil 20 can be accommodated.

  As shown in FIGS. 2 and 3, the first case 31 covers the surface and outer peripheral surface side of the heating coil 20. The 1st case 31 is formed in the circular container shape by which the back surface side of the heating coil 20 was open | released as a whole. The first case 31 has a bottom 311 and a peripheral wall 312. The bottom 311 forms a container-like bottom portion of the first case 31, that is, a portion to be heated 90 side. The bottom portion 311 covers the surface side of the heating coil 20 in a state separated from the surface of the heating coil 20, that is, in a state having a gap S <b> 1 with respect to the surface of the heating coil 20. Further, the surface of the bottom 311 on the heating object 90 side is formed as a flat surface. In this case, as shown in FIG. 3, in the cross section of the gap S1, the dimension in the plane direction of the heating coil 20 is W1, and the dimension in the thickness direction of the heating coil 20 is H1.

  The peripheral wall portion 312 is provided along the outer peripheral edge portion of the bottom portion 311, and is provided so as to stand toward the back surface side of the heating coil 20 with respect to the outer peripheral edge portion of the bottom portion 311. The peripheral wall portion 312 covers the outer peripheral surface side of the heating coil 20 in a state of being separated from the outer peripheral surface of the heating coil 20, that is, with a gap S <b> 2 with respect to the outer peripheral surface of the heating coil 20. In this case, as shown in FIG. 3, in the cross section of the gap S2, the dimension of the heating coil 20 in the plane direction is W2, and the dimension of the heating coil 20 in the thickness direction is H2.

  Moreover, the 1st case 31 has the cylindrical part 313 and the level | step-difference part 314, as shown in FIG.2 and FIG.3. The cylindrical portion 313 is provided at the center portion of the bottom portion 311 so as to protrude from the inner surface side of the bottom portion 311 toward the back surface side of the heating coil 20. The column part 313 is formed in a columnar shape, and its outer diameter is slightly smaller than the inner diameter of the hollow part 201 of the heating coil 20. Therefore, the cylindrical portion 313 can be inserted into the hollow portion 201 of the heating coil 20.

  As shown in FIGS. 1 and 5, the stepped portion 314 is located at the base portion of the columnar portion 313, that is, the connecting portion between the columnar portion 313 and the bottom portion 311, and protrudes toward the back surface side of the heating coil 20. It is formed in a disk shape surrounding the root portion of 313. In this case, the protruding amount of the stepped portion 314 is substantially equal to the dimension H1 in the thickness direction of the heating coil 20 in the gap S1. And the protrusion amount H1 of the level | step-difference part 314 is half or less of the thickness dimension of the heating coil 20. FIG. Further, the outer diameter of the stepped portion 314 is larger than the outer diameter of the columnar portion 313 and is not more than half of the outer diameter of the heating coil 20.

  The heating coil 20 is disposed in the first case 31 with the cylindrical portion 313 of the first case 31 passed through the hollow portion 201. At this time, when the heating coil 20 is pushed into the bottom 311 side, the surface of the heating coil 20 hits the stepped portion 314 and the movement of the heating coil 20 toward the bottom 311 is restricted. Thereby, the separation distance between the surface of the heating coil 20 and the inner surface of the bottom portion 311 is maintained at the protrusion amount H1 of the step portion 314. That is, the step portion 314 defines the position of the heating coil 20 with respect to the inner surface of the bottom portion 311 of the first case 31, thereby defining a gap S <b> 1 between the inner surface of the bottom portion 311 and the surface of the heating coil 20. It functions as a part.

  The second case 32 covers the back side of the heating coil 20. The second case 32 is formed in a disk shape as a whole. The outer diameter of the second case 32 is slightly smaller than the inner diameter of the first case 31, that is, the inner diameter of the peripheral wall portion 312. That is, the second case 32 and the first case are formed so that the outer diameter of the second case 32 and the inner diameter of the first case 31 are a so-called gap fit. A hole 321 is formed at the center of the second case 32. The inner diameter of the hole portion 321 is slightly larger than the outer diameter of the cylindrical portion 313 of the first case 31. That is, in this case, the hole portion 321 and the columnar portion 313 are formed so that the inner diameter of the hole portion 321 and the outer diameter of the columnar portion 313 form a so-called gap fit.

  As shown in FIG. 2 and the like, the induction heating coil unit 1 includes a ferrite core 11 as a magnetic shielding member and a mounting plate 12. The ferrite core 11 is made of a magnetic material and is housed in the case 30 together with the heating coil 20. In the case of this embodiment, the ferrite core 11 is affixed on the back surface of the heating coil 20, for example with an adhesive agent. In this case, the ferrite core 11 is composed of, for example, a plurality of rectangular blocks. And each ferrite core 11 is arrange | positioned substantially radially so that it may extend toward the outer peripheral side from the inner peripheral side of the heating coil 20 centering on the hollow part 201. FIG.

  The ferrite core 11 absorbs the magnetic flux generated by the heating coil 20. Thereby, the magnetic flux generated in the heating coil 20 is prevented from leaking to the back side of the induction heating coil unit 1, and an object other than the heating object 90 disposed on the back side of the induction heating coil unit 1 is heated. prevent. The ferrite core 11 is not limited to a rectangular block shape, and may be, for example, an annular plate shape that matches the shape of the heating coil 20.

  The attachment plate 12 is a member for attaching the induction heating coil unit 1 to a target device. The mounting plate 12 is configured in a disc shape as a whole by, for example, an aluminum plate or a highly rigid resin plate. The mounting plate 12 is provided on the back side of the case 30, that is, on the back side of the second case 32. In the case of the present embodiment, as shown in FIGS. 2 and 3, the screw 131 passes through the center portion of the mounting plate 12 and is screwed into the cylindrical portion 313 of the first case 31. Thereby, the mounting plate 12 is fixed to the case 30. In addition, the case 30 includes take-out portions 331 and 332 that communicate the inside and the outside of the case 30. The take-out portions 331 and 332 are configured by notches formed in the first case 31 and the second case 32. The lead wires 22 and 23 of the heating coil 20 are led out to the outside of the case 30 through the take-out portions 331 and 332, respectively.

  As shown in FIG. 1, the mounting plate 12 has four mounting portions 121 when there are a plurality of mounting plates 12. The attachment portion 121 is provided so as to protrude outward from the outer peripheral portion of the attachment plate 12. The attachment portion 121 is formed with a through hole 122 that penetrates the attachment portion 121 in a circular shape. The induction heating coil unit 1 is detachably attached to a target device by a fastening member (not shown) such as a screw passed through the through hole 122. In addition, in order to improve the airtightness in the case 30, the mounting plate 12 and the case 30 may be provided with a sealing member such as packing.

  As shown in FIGS. 1 to 3, the induction heating coil unit 1 includes a plurality of cooling paths, in this case, a first cooling path 341 and a second cooling path 342, a supply port 151, and a discharge port 152. The cooling paths 341 and 342 are spaces formed between the inner surface of the case 30 and the heating coil 20, and are paths through which a cooling gas for cooling the heating coil 20 passes. In the case of the present embodiment, the first cooling path 341 is formed by the gap S1 formed between the surface on the heating object 90 side, that is, the surface of the heating coil 20 and the inner surface of the bottom 311 of the first case 31. Yes. Further, a second cooling path 342 is formed by a gap S <b> 2 formed between the outer peripheral portion of the heating coil 20 and the inner side surface of the peripheral wall portion 312 of the first case 31 and formed along the outer peripheral portion of the heating coil 20. . In this case, as shown in FIG. 3, the cross-sectional area of the gap S2, that is, the cross-sectional area of the second cooling path 342 indicated by H2 × L2, is the cross-sectional area of the gap S1, that is, the first cooling path 341 indicated by H1 × L1. It is larger than the cross-sectional area.

  The supply port 151 and the discharge port 152 are formed to communicate the inside and the outside of the case 30. That is, the supply port 151 and the discharge port 152 are in communication with the first cooling path 341 and the second cooling path 342. In other words, the first cooling path 341 and the second cooling path 342 are paths that connect the supply port 151 and the discharge port 152, respectively. The supply port 151 is for supplying the cooling gas of the heating coil 20 supplied from the outside of the case 30 to the inside of the case 30, that is, the first cooling path 341 and the second cooling path 342. The discharge port 152 is for discharging the cooling gas supplied from the supply port 151 to the inside of the case 30, that is, the first cooling path 341 and the second cooling path 342 to the outside of the case 30.

  In the case of the present embodiment, the supply port 151 and the discharge port 152 are provided in the peripheral wall portion 312 and are configured by, for example, a so-called one-touch joint for air piping. In this case, the first case 31 has two female screw portions 315 and 316 formed through the peripheral wall portion 312. The one-touch joints constituting the supply port 151 and the discharge port 152 are respectively screwed into the female screw portions 315 and 316 and attached to the peripheral wall portion 312 of the first case 31. In the present embodiment, as shown in FIG. 2 and the like, the inner diameter, that is, the cross-sectional area of the discharge port 152 is set larger than the inner diameter, that is, the cross-sectional area of the supply port 151.

  A supply-side air pipe 161 and a discharge-side air pipe 162 are connected to the supply port 151 and the discharge port 152. The supply port 151 and the discharge port 152 are not limited to the one-touch joint as long as the air pipes 161 and 162 can be connected to each other. The air pipes 161 and 162 are, for example, commercially available resin air tubes or the like, but are not limited thereto. The air pipes 161 and 162 are not limited to this, and are made of resin or the like, or are made of metal or the like and have rigidity. Any of them may be used.

  As shown in FIG. 1, the supply port 151 and the discharge port 152 are arranged adjacent to each other in the circumferential direction of the heating coil 20. That is, as shown in FIG. 1, when the center portion of the heating coil 20 is set as the vertex O in plan view, the supply port 151 and the discharge port 152 have a straight line L1 connecting the vertex O and the supply port 151 and the vertex O. The angle α formed by the straight line L2 connecting the discharge port 152 is provided at a position where the angle is an acute angle. That is, the supply port 151 and the discharge port 152 are arranged so that the angle α formed by the supply port 151, the vertex O, and the discharge port 152 is 45 ° or less when the vertex O is the center. In other words, the supply port 151 and the discharge port 152 are arranged so that the angle α does not exceed 45 ° and is not separated.

  In addition, the supply port 151 is disposed at a position overlapping with one of the extraction portion 331 of the start-side lead wire 22 or the extraction portion 332 of the termination-side lead wire 23 in plan view. The discharge port 152 is disposed at a position overlapping the other of the take-out portion 331 of the start-side lead wire 22 or the take-out portion 332 of the end-side lead wire 23 in plan view. In the case of the present embodiment, as shown in FIGS. 1 and 2, the supply port 151 and the take-out portion 332 of the terminal-side lead wire 23 are provided at a position where they overlap in a plan view. Further, the discharge port 152 and the takeout portion 331 of the start end side lead wire 22 are provided at a position where they overlap in a plan view.

  Moreover, the induction heating coil unit 1 is provided with the partition part 141, as shown in FIG.1 and FIG.2. As shown in FIG. 1, the partition portion 141 is provided in a region on the acute angle α side in the second cooling path 342 and partitions the supply port 151 and the discharge port 152. Thereby, it is possible to suppress a so-called short circuit in which the cooling gas entering the second cooling path 342 from the supply port 151 reaches the discharge port 152 side through the region on the acute angle α side, that is, the shortest path.

  In addition, the partition part 141 does not need to partition between the supply port 151 and the discharge port 152 in the area | region of the acute angle (alpha) side of the 2nd cooling path 342 in a perfect airtight state. For example, partitioning is performed so that most of the cooling gas flowing into the second cooling path 342 from the supply port 151 largely bypasses the second cooling path 342 and reaches the discharge port 152 as shown by an arrow Y1 in FIG. The part 141 should just partition between the supply port 151 and the discharge port 152.

  In this case, the second cooling path 342 is formed in an arc shape having a length exceeding a semicircle in a plan view. According to this, since the length of the 2nd cooling path 342 can be ensured as long as possible, the outer peripheral part of the heating coil 20 can be cooled more effectively.

  In the case of this embodiment, the partition part 141 is comprised by the termination | terminus side lead wire 23. FIG. Furthermore, in the case of the present embodiment, the partition portion 141 includes the sheet member 17. The sheet member 17 is a rectangular sheet-like member having, for example, electrical insulation and heat resistance. As shown in FIG. 4, the sheet member 17 is attached to the outer peripheral portion of the heating coil 20 so as to cover the terminal-side lead wire 23. In this case, the sheet member 17 is attached to a part of the outer periphery of the heating coil 20 with, for example, a thermosetting adhesive.

  As shown in FIG. 1 and the like, the terminal-side lead wire 23 is in contact with the inner side surface of the peripheral wall portion 312 in the first case 31 via the sheet member 17. In this case, the sheet member 17 exists between the terminal end lead wire 23 and the peripheral wall portion 312. Therefore, the heating coil 20 and the first case 31 are electrically insulated by the sheet member 17 in the peripheral portion of the terminal-side lead wire 23. Then, the sheet member 17 has a terminal end from a portion of the terminal-side lead wire 23 opposite to the center portion O, that is, a portion in contact with the inner surface of the peripheral wall portion 312 of the first case 31 in a plan view. A smooth slope is formed over the outer peripheral portion of the heating coil 20 on both sides of the side lead wire 23.

  In addition, the partition part 141 does not necessarily need to be comprised by the termination | terminus side lead wire 23 and the sheet | seat member 17. FIG. The partition part 141 may be configured only by the terminal end lead wire 23 without having the sheet member 17, for example. For example, the partition part 141 may be formed integrally with the first case 31 or the second case 32. Moreover, the partition part 141 may be, for example, a rod-like sponge or a rubber member.

  Further, the induction heating coil unit 1 includes a temperature sensor 18 as shown in FIGS. 1 and 4. The temperature sensor 18 is composed of, for example, a thermocouple or the like, and is provided on the back side of the heating coil 20. The temperature sensor 18 functions as a temperature detection unit that can detect the temperature of the heating coil 20. The temperature detecting means may measure the temperature of the heating coil 20 by detecting the resistance value of the heating coil 20 at the time of driving, or measure the temperature by capturing infrared rays generated from the heating coil 20. It may be so-called thermography.

[Configuration of induction heating system]
Next, an induction heating system 40 using the induction heating coil unit 1 will be described with reference to FIG. As shown in FIG. 6, the induction heating system 40 includes an induction heating coil unit 1, a power supply device 41, a cooling gas supply device 42, an electromagnetic valve 43, and a control device 44. The power supply device 41 is connected to the lead wires 22 and 23 of the heating coil 20 and supplies a driving high-frequency current to the heating coil 20. The cooling gas supply device 42 is connected to a supply port 151 of the induction heating coil unit 1 via an air pipe 161 on the supply side. The cooling gas supply device 42 is for supplying a cooling gas such as compressed air or compressed nitrogen into the case 30. The cooling gas supply device 42 is, for example, a blower capable of blowing air, a cylinder storing compressed air or liquid nitrogen, or a compressor capable of supplying compressed air at a pressure equal to or higher than atmospheric pressure.

  The solenoid valve 43 is a pneumatic solenoid valve, and is opened and closed in response to a control signal from the control device 44. The electromagnetic valve 43 is provided between the cooling gas supply device 42 and the induction heating coil unit 1. When the electromagnetic valve 43 is opened, a path connecting the cooling gas supply device 42 and the supply port 151 of the induction heating coil unit 1 is opened. Thereby, the cooling gas discharged from the cooling gas supply device 42 is supplied into the case 30 through the supply port 151 of the induction heating coil unit 1.

  The cooling gas flowing into the case 30 from the supply port 151 passes through the first cooling path 341 and the second cooling path 342 and reaches the discharge port 152 as shown by arrows Y1 and Y2 in FIGS. . At that time, the surface and outer peripheral portion of the heating coil 20 are cooled by the cooling gas passing through the first cooling path 341 and the second cooling path 342. Thereafter, the cooling gas that has cooled the heating coil 20 through the first cooling path 341 and the second cooling path 342 is discharged out of the case 30 through the discharge port 152 and then released into the atmosphere.

  When the electromagnetic valve 43 is closed, the path connecting the cooling gas supply device 42 and the supply port 151 of the induction heating coil unit 1 is closed. Thereby, the cooling gas discharged from the cooling gas supply device 42 is not supplied into the case 30 of the induction heating coil unit 1. That is, when the electromagnetic valve 43 is closed, the supply of the cooling gas by the cooling gas supply device 42 is stopped.

  The controller 44 controls the cooling operation of the induction heating coil unit 1 by mainly controlling the drive of the electromagnetic valve 43. The control device 44 includes a control unit 441, an operation unit 442, and a display unit 443. The control unit 441 is mainly configured by a microcomputer having a storage area such as a CPU (not shown), a ROM, a RAM, and a rewritable flash memory. The control unit 441 is electrically connected to the electromagnetic valve 43 and the temperature sensor 18. The control unit 441 controls the opening / closing operation of the electromagnetic valve 43 by outputting an operation command to the electromagnetic valve 43. Further, the detection result of the temperature sensor 18 is input to the control unit 441.

  The operation unit 442 is an input device such as a touch panel, a switch, a keyboard, and a mouse, and accepts an input operation from a user. The display unit 443 includes, for example, a liquid crystal panel display, a 7-segment display, and the like, and is based on the input content and setting content input to the operation unit 442, the opening / closing status of the electromagnetic valve 43, and the heating result based on the detection result of the temperature sensor 18. The temperature status of the coil 20 is displayed.

[Cooling control by induction heating system]
Next, the cooling control performed by the control device 44 will be described with reference to FIG. The control unit 441 stores a cooling control program for cooling the heating coil 20. The control unit 441 executes cooling control by executing a cooling control program in the CPU. The cooling control is not limited to being performed by executing a cooling control program in the CPU, and may be performed by hardware configured by an integrated circuit integrated with the control unit 441 or the like.

  The cooling control supplies the cooling gas from the cooling gas supply device 42 to the cooling paths 341 and 342 when the temperature of the heating coil 20 based on the detection result of the temperature sensor 18 is equal to or higher than the threshold Ta, and the temperature sensor 18. When the temperature of the heating coil 20 based on the detection result is less than the threshold value Ta, the supply of the cooling gas from the cooling gas supply device 42 to the cooling paths 341 and 342 is stopped.

  Specifically, before driving the induction heating coil unit 1, the user operates the operation unit 442 to set the threshold value Ta in advance. The threshold value Ta input by the operation of the operation unit 442 is stored in the storage area of the control unit 441. And when supply of the high frequency current by the power supply device 41 is started and the induction heating coil unit 1 is driven, the control part 441 will perform the cooling control shown in FIG.

  When the cooling control shown in FIG. 7 is executed, the control unit 441 first acquires the detected temperature Tb of the heating coil 20 by the temperature sensor 18 as shown in step S11. Next, as shown in step S12, the control unit 441 determines whether or not the detected temperature Tb acquired in step S11 is equal to or higher than a preset threshold value Ta. When the detected temperature Tb is equal to or higher than the threshold value Ta (YES in step S12), the control unit 441 proceeds to step S13, and opens the electromagnetic valve 43. Thereby, the cooling gas from the cooling gas supply device 42 is supplied to the cooling paths 341 and 342 of the induction heating coil unit 1, and the inner surfaces of the heating coil 20 and the case 30 are cooled. As a result, an excessive temperature rise of the entire induction heating coil unit 1 including the heating coil 20 is suppressed.

  On the other hand, when the detected temperature Tb is less than the threshold value Ta (YES in step S12), the control unit 441 proceeds to step S14 and closes the electromagnetic valve 43. Thereby, the supply of the cooling gas from the cooling gas supply device 42 to the cooling paths 341 and 342 of the induction heating coil unit 1 is stopped. Thereafter, the control unit 441 shifts the process to step S11 and repeats step S11 and subsequent steps. The cooling process shown in steps S11 to S14 is performed while the induction heating coil unit 1 is being driven.

  According to 1st Embodiment described above, the heating coil 20 is accommodated in the case 30 and unitized. According to this, when attaching the heating coil 20 to the target apparatus or removing the heating coil 20, the user can handle the heating coil 20 and the case 30 integrally as the induction heating coil unit 1. , Handling becomes convenient. Therefore, the heating coil 20 can be easily maintained and used for other devices.

  The case 30 that houses the heating coil 20 has an insulating property. Therefore, when the user attaches or removes the induction heating coil unit 1 to or from the target device, the user can handle the induction heating coil unit 1 without directly touching the heating coil 20 that has a risk of high temperature or high voltage. . Therefore, safety can be improved.

  The case 30 has a supply port 151, a discharge port 152, and cooling paths 341 and 342. The supply port 151 communicates the inside and the outside of the case 30, and supplies the cooling gas supplied from the cooling gas supply device 42 provided outside the case 30 into the case 30. is there. The discharge port 152 communicates the inside and the outside of the case 30 and discharges the cooling gas supplied from the supply port 151 into the case 30 to the outside of the case 30. The cooling paths 341 and 342 are formed by gaps S <b> 1 and S <b> 2 formed between the case 30 and the heating coil 20, and connect the supply port 151 and the discharge port 152.

  In this configuration, when the cooling gas is supplied from the cooling gas supply device 42, the cooling gas is supplied into the case 30 through the supply port 151 of the induction heating coil unit 1. Then, the cooling gas flowing into the case 30 from the supply port 151 reaches the discharge port 152 through the cooling paths 341 and 342 as indicated by arrows Y1 and Y2 in FIG. Thereby, the surface and outer peripheral part of the heating coil 20 are mainly cooled by the cooling gas passing through the cooling paths 341 and 342. At that time, the cooling gas passes through the cooling paths 341 and 342 formed in the case 30 and therefore does not come into contact with the object to be heated. According to this, the cooling gas can cool the heating coil 20 efficiently without lowering the temperature of the heating object 90 as much as possible. Therefore, an excessive temperature rise of the heating coil 20 can be suppressed and an increase in resistance due to the temperature rise can be suppressed. As a result, the output efficiency of the heating coil 20 can be improved.

  Furthermore, in the case of this embodiment, the heating coil 20 is accommodated in the case 30 which has electrical insulation. Therefore, it is not necessary to cover the periphery of the heating coil 20 with an electrically insulating resin or the like in order to ensure safety in handling. According to this, a part of the cooling gas passing through the cooling paths 341 and 342 can easily escape between the windings of the heating coil 20. Therefore, since the heating coil 20 can be cooled for each turn, the cooling performance can be improved while improving the safety of handling.

  Further, the supply port 151 of the induction heating coil unit 1 can be connected to an external cooling gas supply device 42 via an air pipe 161. In this case, the cooling gas supply device 42 may be any device that can supply gas such as air or nitrogen, and is not limited to a specific configuration. Here, the induction heating coil unit 1 is assumed to be used in, for example, a factory or a work site. In general factories and work sites, compressors and the like for driving pneumatically driven devices are often set. In this case, the user can use a general compressor or the like installed in a factory or work site as the cooling gas supply device 42. Thus, the induction heating coil unit 1 does not require a dedicated blower or the like for supplying the cooling supply gas. Therefore, the induction heating coil unit 1 alone and the apparatus in which the induction heating coil unit 1 is incorporated can be reduced in size.

  Here, the surface of the heating coil 20 that faces the heating object 90, that is, the surface of the heating coil 20 is likely to rise in temperature due to the influence of radiant heat from the heating object 90. Therefore, the cooling paths 341 and 342 are configured to include the first cooling path 341. The first cooling path 341 includes a gap S <b> 1 formed between the surface on the heating object 90 side of the heating coil 20, that is, the surface of the heating coil 20 and the case 30. According to this, the surface of the heating coil 20 is directly cooled by the cooling gas passing through the first cooling path 341 coming into contact with the surface of the heating coil 20. Therefore, the surface of the heating coil 20 that easily rises in temperature due to the influence of radiant heat from the heating object 90 can be efficiently cooled.

  Further, the cooling paths 341 and 342 are configured to include the second cooling path 342. The second cooling path 342 is between the outer peripheral portion of the heating coil 20 and the case 30 and is configured by a gap S <b> 2 formed along the outer peripheral portion of the heating coil 20. The cooling gas passing through the second cooling path 342 can also efficiently cool the outer peripheral portion of the heating coil 20.

  Here, when the cross-sectional area of the first cooling path 341 is small, a sufficient amount of the cooling gas does not flow through the first cooling path 341, and the cooling effect of the heating coil 20 cannot be exhibited sufficiently. In this case, in order to ensure a large cross-sectional area of the first cooling path 341, it is necessary to increase the dimension H1 with respect to the thickness direction of the heating coil 20. However, when the dimension H1 in the thickness direction of the heating coil 20 is increased, the distance from the surface of the heating coil 20 to the heating object 90 is also increased, and as a result, the heating efficiency is lowered.

  Therefore, in the present embodiment, the induction heating coil unit 1 includes a second cooling path 342 that is provided around the heating coil 20 and communicates with the first cooling path 341. The sectional area of the second cooling path 342 is set larger than the sectional area of the first cooling path 341. Therefore, more cooling gas flows through the second cooling path 342 more easily than the first cooling path 341. Therefore, even when the dimension H1 of the first cooling path 341 is small, the cooling gas passes through the second cooling path 342 provided around the heating coil 20 and is appropriately changed from the circumference of the heating coil 20 to the first. It becomes easy to flow into one cooling path 341. Thereby, the dimension H1 of the 1st cooling path 341 can be made as small as possible, without reducing cooling performance, As a result, coexistence with the heating performance and cooling performance of the heating coil 20 can be aimed at.

  Further, the supply port 151 and the discharge port 152 are provided at positions where an angle α formed by the vertex O, which is the central portion of the heating coil 20, the supply port 151, and the discharge port 152 is an acute angle in plan view. The induction heating coil unit 1 includes a partition portion 141. The partition portion 141 is provided in a region on the acute angle side in the second cooling path 342 and partitions the supply port 151 and the discharge port 152.

  Thereby, it is possible to suppress a so-called short circuit in which the cooling gas entering the second cooling path 342 from the supply port 151 reaches the discharge port 152 side through the region on the acute angle α side, that is, the shortest path. That is, according to this, the cooling gas that has flowed into the second cooling path 342 from the supply port 151 can easily flow along the outer peripheral portion of the heating coil 20 as indicated by the arrow Y1 in FIG. Therefore, the cooling gas is likely to contact over substantially the entire outer peripheral portion of the heating coil 20. Further, since the cooling gas flows through the second cooling path 342, the cooling gas flowing out from the second cooling path 342 can easily flow into the first cooling path 341 as well.

  Therefore, the distance of the path from the supply port 151 to the discharge port 152, that is, the distance through which the cold air flows can be ensured as long as possible. That is, according to this, the contact area with the cooling gas can be ensured as large as possible, and the contact time with the cooling gas can be ensured as long as possible. Therefore, most of the cooling gas supplied into the case 30 can contribute to the cooling of the heating coil 20, and as a result, the heating coil 20 can be efficiently cooled without wasting the cooling gas. .

  In this case, the partition part 141 is configured by the terminal-side lead wire 23. That is, in this embodiment, the partition part 141 is comprised by the termination side lead wire 23 with which the heating coil 20 is provided originally. According to this, in order to provide the partition part 141, it is not necessary to make the shape of the 1st case 31 special and to provide a new member. Therefore, an increase in the number of parts due to the provision of the partition portion 141 can be suppressed, and as a result, the number of assembly steps of the induction heating coil unit 1 can be suppressed and the cost can be reduced.

  Further, the partition portion 141 includes the sheet member 17. The sheet member 17 is formed in a smooth slope in a plan view, that is, from the contact portion with the inner surface of the peripheral wall portion 312 of the first case 31 to the outer peripheral portion of the heating coil 20 on both sides of the termination-side lead wire 23. Yes. According to this, the cooling gas flowing in from the supply port 151 and the cooling gas flowing out from the discharge port 152 can flow smoothly along the sheet member 17. That is, the cooling gas flowing in the vicinity of the supply port 151 and the discharge port 152 can be rectified. Therefore, the flow of the cooling gas from the supply port 151 to the discharge port 152 can be made smooth, and as a result, the cooling efficiency of the heating coil 20 and the like by the cooling gas can be improved.

  Further, the lead wires 22 and 23 of the heating coil 20 are arranged at positions overlapping with one of the supply port 151 and the discharge port 152 in plan view, respectively. That is, the lead wires 22 and 23 drawn from the case 30 and the air pipes 161 and 162 connected to the supply port 151 and the discharge port 152 are arranged to extend in the same direction. According to this, the lead-out direction of the lead wires 22 and 23 and the air pipes 161 and 162 can be collected in substantially one direction. As a result, the induction heating coil unit 1 becomes compact as a whole. Furthermore, the lead wires 22 and 23 and the air pipes 161 and 162 can be easily routed, so that the induction heating coil unit 1 can be easily attached to the target device.

  Further, according to the induction heating system 40, when the detection result of the temperature sensor 18 is equal to or higher than the threshold value Ta, the control device 44 opens the electromagnetic valve 43 so that the cooling gas supply device 42 supplies the cooling path 341. , 342 is supplied with a cooling gas. On the other hand, when the detection result of the temperature sensor 18 is less than the threshold value Ta, the control device 44 closes the electromagnetic valve 43 and supplies the cooling gas from the cooling gas supply device 42 to the cooling paths 341 and 342. To stop. According to this, since the cooling operation can be appropriately performed according to the temperature state of the heating coil 20, the amount of the cooling gas used can be reduced, and the energy saving performance can be improved.

  In addition, the shape of the induction heating coil unit 1, that is, the shape of the heating coil 20 and the case 30 can be appropriately changed according to the shape of the heating object 90. For example, as shown in FIGS. 8 and 9, the heating coil 20 and the case 30 may be formed in a rectangular shape. This also provides the same effects as those described above.

  Moreover, you may provide the solenoid valve 43 in the discharge port 152 side. Further, the electromagnetic valve 43 may be capable of electromagnetically adjusting the flow rate of the cooling gas passing through the electromagnetic valve 43 as well as simply opening and closing the path. In this case, the control device 44 sets the threshold Ta to a plurality of stages according to the temperature state of the heating coil 20, and adjusts the flow rate of the cooling gas passing through the electromagnetic valve 43 according to the plurality of stages of the threshold Ta. To. According to this, since the flow rate of the cooling gas can be adjusted according to the temperature state of the heating coil 20, further fine adjustment is possible according to the temperature state of the heating coil 20. Therefore, according to this, the usage-amount of the gas for cooling can further be reduced, and also the energy-saving performance can be improved further.

  Further, instead of the electromagnetic valve 43, a manual valve that can be opened and closed by a manual operation may be provided. In this case, the control of the electromagnetic valve 43 by the control device 44 becomes unnecessary. According to this, since the control by the control device 44 becomes unnecessary, a simpler configuration can be achieved.

  Moreover, the induction heating coil unit 1 should just be a structure provided with at least one of the 1st cooling path 341 or the 2nd cooling path 342 as a cooling path, ie, either the clearance S1 or the clearance S2. Even in this case, the cooling effect of the heating coil 20 can be obtained although it is slightly inferior to that provided with both the first cooling path 341 and the second cooling path 342.

  In addition, the induction heating coil unit 1 includes the first cooling path 341 on the supply port 151 side and the discharge port 152 side on an area having an acute angle in the first cooling path 341, for example, on a line connecting the partition portion 141 and the center portion O. You may provide the partition part partitioned into. According to this, it is possible to suppress a so-called short circuit in which the cooling gas entering the first cooling path 341 from the supply port 151 passes through the region on the acute angle α side, that is, the shortest path, to the discharge port 152 side. That is, according to this, the cooling gas that has flowed into the first cooling path 341 flows on the surface of the heating coil 20 so as to bypass the periphery of the step portion 314, so that the contact distance with the surface of the heating coil 20 As a result, the surface of the heating coil 20 can be efficiently cooled.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS.
The induction heating coil unit 2 of the second embodiment is configured on the basis of the induction heating coil unit 1 of the first embodiment, but the dimensions are appropriately changed for each configuration. In the following description, “A” is appended to the end of the reference numerals of the components that require substantial changes to the induction heating coil unit 1 described above.

  The induction heating coil unit 2 of the second embodiment includes a heating coil 20 and a case 30A. The case 30A has a case hole 37 in addition to the configuration of the case 30A of the first embodiment. The case hole 37 is formed by penetrating the center of the case 30 </ b> A, that is, the first case 31 </ b> A and the second case 32 </ b> A, in a circular shape in the thickness direction of the heating coil 20. In this case, as shown in FIG. 11, the mounting plate 12 </ b> A has a mounting plate hole 123. The mounting plate hole 123 is located at a position overlapping the case hole 37, and is formed through the mounting plate 12A in a circular shape in the thickness direction. The inner diameter of the case hole 37 and the inner diameter of the mounting plate hole 123 are equal.

  The induction heating coil unit 2 further includes an inner magnetic shield ring 191 and an outer magnetic shield ring 192. The inner magnetic shield ring 191 and the outer magnetic shield ring 192 are made of a magnetic material like the ferrite core 11. The inner magnetic shield 191 is formed in an annular shape, and surrounds the periphery of the columnar portion 313 of the first case 31A. The outer magnetic shield ring 192 is formed in an annular shape, and surrounds the outer periphery of the heating coil 20 in a state of being separated from the outer periphery of the heating coil 20. In this case, a gap S2A is formed between the outer peripheral portion of the heating coil 20 and the peripheral wall portion 312 of the first case 31A and between the inner peripheral portion of the outer magnetic shield ring 192 and the outer peripheral portion of the heating coil 20. . A second cooling path 342A is formed by the gap S2A.

  As shown in FIG. 12, the first case 31 </ b> A is fixed to the second case 32 </ b> A with screws 132. The mounting plate 12A is fixed to the second case 32A with a screw 133.

  The induction heating coil unit 2 can be incorporated into a mold apparatus 50 as shown in FIG. In the following description, the vertical direction of the paper surface in FIG. The mold apparatus 50 includes an upper mold 511 and a lower mold 512, an upper mold support base 521 and a lower mold support base 522, and an upper base board 531 and a lower base board 532. Although the details of the upper and lower molds 511 and 512 are not shown, the molds are formed on the surfaces facing each other. The mold is filled with resin or the like and molded.

  Upper and lower molds 511 and 512 are attached to and supported by upper and lower mold support bases 521 and 522, respectively. The upper and lower mold support bases 521 and 522 are attached and fixed to the upper and lower base boards 531 and 531, respectively. The upper and lower mold support bases 521 and 522 each have a unit accommodating portion 523 and a mandrel 524. The unit accommodating portion 523 is configured to accommodate the induction heating coil unit 2. The mandrel 524 is formed in a cylindrical rod shape that can be inserted into the case hole portion 37 and the mounting plate hole portion 123, and is configured integrally with the mold support bases 521 and 522.

  The induction heating coil unit 2 is placed in the unit housing portion 523 in a state where the surface of the heating coil 20 faces the molds 511 and 512 and the mandrel 524 is passed through the case hole 37 and the mounting plate hole 123. Be placed. The induction heating coil unit 2 is attached to the mold support bases 521 and 522 with screws 134 or the like. In this case, the heating objects of the induction heating coil unit 2 are the upper and lower molds 511 and 512. According to this mold apparatus 50, the induction heating coil unit 2 can perform molding while heating the molds 511 and 512.

  In this case, since the induction heating coil unit 2 is disposed in the unit housing portion 523, the periphery thereof is surrounded by the mold support bases 521 and 522. For this reason, heat generated by the heating coil 20 itself and radiant heat from the molds 511 and 512 are easily accumulated in the case 30A. That is, the heating coil 20 of the present embodiment is likely to be hotter than that of the first embodiment. However, the induction heating coil unit 2 also includes the first cooling path 341 and the second cooling path 342A through which the cooling gas flows, similarly to the induction heating coil unit 1 of the first embodiment. According to this, even if it is a case where heat tends to accumulate in the case 30A of the induction heating coil unit 2, the heating coil 20 can be efficiently cooled.

  In this configuration, the mold apparatus 50 is configured to be movable in a direction in which the upper base board 531 and the lower base board 532 are separated from each other. Here, when liquid resin or the like is injected into the molds 511 and 512, the upper base board 531 and the lower base board 532 are pressurized in a direction approaching each other. As a result, the mold 511 is pressed. A mold clamping force of several to several tens of tons acts on 512 and the mold support bases 521 and 522. In this case, if the unit accommodating portion 523 is a simple space in which the mandrel 524 is not provided, the stress due to the clamping force is concentrated on the peripheral portion 525 of the unit accommodating portion 523. Then, the surrounding portion 525 may be crushed, and as a result, the induction heating coil unit 2 may be crushed.

  On the other hand, according to the present embodiment, the mold support bases 521 and 522 have the mandrel 524. The induction heating coil unit 2 has a unit housing portion in a state where the surface of the heating coil 20 faces the molds 511 and 512 and the mandrel 524 is passed through the case hole portion 37 and the mounting plate hole portion 123. 523. According to this, the mold clamping force acting on the mold support bases 521 and 522 can be received not only by the peripheral portion 525 of the unit housing portion 523 but also by the mandrel 524. Thereby, it is possible to prevent the mold clamping force from being concentrated on the peripheral portion 525 of the unit accommodating portion 523. As a result, it is possible to suppress the peripheral portion 525 from being crushed and eventually the induction heating coil unit 2 from being crushed.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG.
The induction heating coil unit 3 of the third embodiment is configured on the basis of the induction heating coil unit 1 of the first embodiment, but the dimensions are appropriately changed for each configuration. In the following description, about the structure which needs a substantial change with respect to the induction heating coil unit 1 mentioned above, "B" is attached | subjected to the end of the code | symbol of the structure.

  The induction heating coil unit 3 of the third embodiment includes a heating coil 20 and a case 30B. In the present embodiment, the male screw portions 315 and 316 of the case 30B are arranged on a straight line across the vertex O that is the central portion of the heating coil 20 in plan view. Thereby, the supply port 151 and the discharge port 152 are provided on a straight line across the vertex O that is the central portion of the heating coil 20 in plan view. That is, the supply port 151 and the discharge port 152 are provided at positions facing each other at approximately 180 ° with the vertex O in between.

  In addition, the induction heating coil unit 3 includes two rectifying units 142 and 143 as a partition unit that partitions the inside of the second cooling path 342B into two. The two rectifying units 142 and 143 are provided in positions corresponding to the supply port 151 and the discharge port 152 in the second cooling path 342B, that is, positions facing the supply port 151 and the discharge port 152, respectively. That is, the supply port 151, the discharge port 152, and the rectifying units 142 and 143 are arranged on a straight line in plan view.

  The rectifiers 142 and 143 are for branching or joining the cooling gas flowing through the second cooling path 342. That is, the second cooling path 342B is divided into two paths based on the rectifying units 142 and 143. That is, in this embodiment, the induction heating coil unit 3 includes two second cooling paths 342B and 342B. In this case, the rectification unit 142 provided on the supply port 151 side functions as a diversion unit 142 for branching the cooling gas flowing into the second cooling path 342B from the supply port 151 in two directions. Further, the rectification unit 143 provided on the discharge port 152 side functions as a merge unit 143 that merges the branched cooling gas and guides it to the discharge port 152.

  In the case of the present embodiment, each of the flow dividing portion 142 and the joining portion 143 is a member formed in a triangular prism shape, and is made of, for example, a resin having electrical insulating properties and heat resistance. In this case, the diverter 142 is provided by adhering the base to the outer periphery of the heating coil 20 with the apex of the triangle facing the supply port 151 in a plan view. Further, the junction 143 is provided by adhering the bottom to the outer peripheral portion of the heating coil 20 with the apex of the triangle facing the discharge port 152 in a plan view.

  According to this, there exist the following effects. That is, the cooling gas supplied from the supply port 151 divides into two at the flow dividing section 142 as shown by an arrow Y3 in FIG. 14 and goes around the second cooling path 342B, and as shown by an arrow Y4, the first cooling path. Go around 341B. Accordingly, the heating coil 20 is cooled by the cooling gas that travels around the first cooling path 341B and the second cooling path 342B.

  Here, when the diameter of the heating coil 20 is relatively large, if the second cooling path 342 is formed in an arc shape having a length exceeding the semicircular arc as in the first embodiment, the distance of the second cooling path 342 is increased. become longer. Then, in the vicinity of the discharge port 152 side, the temperature of the cooling gas easily rises, and the cooling capacity of the heating coil 20 decreases. On the other hand, the induction heating coil unit 3 according to the present embodiment includes two second cooling paths 342B formed in a substantially semicircular arc shape. Therefore, as compared with the case where the second cooling path 342 is formed in an arc shape having a length exceeding the semicircular arc as in the first embodiment, the distance of one second cooling path 342B, that is, the supply port 151 to the discharge port. The distance of the route reaching 152 can be shortened. Thereby, the temperature rise of the cooling gas in the vicinity of the discharge port 152 is suppressed as much as possible, and as a result, the cooling capacity of the heating coil 20 can be suppressed and the heating coil 20 can be efficiently cooled. This is more effective when, for example, the diameter of the heating coil 20 is 150 mm or more.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG.
The induction heating coil unit 4 according to the fourth embodiment is configured on the basis of the induction heating coil unit 1 according to the first embodiment, but the size of each component is appropriately changed. In the following description, about the structure which needs a substantial change with respect to the induction heating coil unit 1 mentioned above, "C" is attached | subjected to the end of the code | symbol of the structure.

  As shown in FIG. 15, the induction heating coil unit 4 of the fourth embodiment includes a plurality of sets, in this case, two sets of supply ports 151 and discharge ports 152, and a plurality of, in this case, two partition portions 141. The supply port 151 and the discharge port 152 of each set are arranged at a position where the angle α with the central portion O of the heating coil 20 as an apex is an obtuse angle of 90 ° or more. In this case, one set of supply ports 151 and the other set of discharge ports 152 are provided at positions facing each other across the vertex O. Further, the two partition portions 141 and 141 are provided between the two supply ports 151 and 151 adjacent to each other in the gap S2 and between the two discharge ports 152 and 152 adjacent to each other. Thus, two second cooling paths 342C and 342C separated from each other are formed.

  In the fourth embodiment, the same function and effect as those of the third embodiment described above can be obtained. That is, the induction heating coil unit 4 in the present embodiment includes two second cooling paths 342C that are separated from each other. The second cooling path 342C is formed in an arc shape shorter than the semicircular arc shape. Therefore, compared to the case where the second cooling path 342 is formed in an arc shape having a length exceeding the semicircular arc as in the first embodiment, the distance of one second cooling path 342C can be shortened. Thereby, the temperature rise of the cooling gas in the vicinity of the discharge port 152 is suppressed as much as possible, and as a result, the cooling capacity of the heating coil 20 can be suppressed and the heating coil 20 can be efficiently cooled. This is more effective when, for example, the diameter of the heating coil 20 is 150 mm or more.

  The induction heating coil unit 4 may include three or more sets of supply ports 151 and discharge ports 152. That is, the induction heating coil unit 4 may include three or more supply ports 151 and discharge ports 152. According to this, since the distance between the cooling paths from the supply port 151 to the discharge port 152 can be further shortened, the cooling efficiency of the heating coil 20 can be further improved.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIGS.
The induction heating coil unit 5 of the fifth embodiment is configured on the basis of the induction heating coil unit 1 of the first embodiment, but the dimensions are appropriately changed for each configuration. In the following description, “D” is appended to the end of the reference numerals of the components that require substantial changes to the induction heating coil unit 1 described above.

  In the induction heating coil unit 5 of the fifth embodiment, as shown in FIG. 17, the supply port 151 and the discharge port 152 are provided on a substantially straight line across the vertex O that is the center of the heating coil 20 in plan view. ing. That is, the supply port 151 and the discharge port 152 are provided at positions facing each other at approximately 180 ° with the vertex O in between. The induction heating coil unit 5 further includes a first connection path 351, a second connection path 352, a third connection path 353, and a fourth connection path 354 in addition to the first cooling path 341 and the second cooling path 342. I have. The first connection path 351 and the second connection path 352 are paths that connect the supply port 151 and the gap S1, that is, paths that connect the supply port 151 and the first cooling path 341. The third connection path 353 and the fourth connection path 354 are paths that connect the gap S <b> 2 and the discharge port 152, i.e., paths that connect the second cooling path 342 and the discharge port 152.

  That is, the case 30D includes a first case 31D and a second case 32D. The first case 31 </ b> D is formed in a cylindrical container shape that does not have the column portion 313 or the step portion 314, and covers the surface side and the outer peripheral surface side of the heating coil 20. In this case, a gap S <b> 1 is formed between the inner surface of the first case 31 </ b> D and the surface of the heating coil 20. This gap S1 functions as the first cooling path 341 as in the above-described embodiments. Further, a gap S2 is formed between the outer peripheral surface side of the heating coil 20 and the peripheral wall portion 312 of the first case 31D. This gap S2 functions as the second cooling path 342 as in the above-described embodiments. In the present embodiment, the supply port 151 and the discharge port 152 are attached by being screwed into female screw portions 324 and 325 provided in the peripheral wall portion of the second case 32D.

  The second case 32D has a cylindrical portion 322. The cylindrical portion 322 has a cylindrical shape and is provided to stand at the center of the bottom portion 323 of the second case 32D. The first connection path 351 is formed so as to dig in the bottom 323 of the second case 32D from the supply port 151 toward the center of the second case 32D, that is, toward the center O of the heating coil 20. Further, the second connection path 352 is configured by a space inside the cylindrical portion 322. The second connection path 352 communicates with the gap S <b> 1 on the surface side of the heating coil 20. Accordingly, the first connection path 351 and the second connection path 352 connect the supply port 151 and the gap S1, that is, the supply port 151 and the first cooling path 341.

  The third connection path 353 is formed such that the surface on the heating coil 20 side in the second case 32D is dug down into an annular shape surrounding the cylindrical portion 322. The fourth connection path 354 is formed so as to dig in the bottom 323 of the second case 32D from the third connection path 353 toward the discharge port 152. Thus, the third connection path 353 and the fourth connection path 354 connect the gap S2 and the discharge port 152, that is, the second cooling path 342 and the discharge port 152.

  That is, in the present embodiment, the supply port 151 and the discharge port 152 include the first connection path 351, the second connection path 352, the first cooling path 341, the second cooling path 342, the third connection path 353, and the fourth connection path. The connection paths 354 are connected and communicated in this order. Therefore, the cooling gas supplied from the supply port 151 flows into the first cooling path 341 via the first connection path 351 and the second connection path 352, as indicated by the arrow Y5 in FIGS. It flows through the first cooling path 341 and the second cooling path 342. Thereafter, the cooling gas reaches the discharge port 152 through the third connection path 353 and the fourth connection path 354 and is discharged from the discharge port 152. At that time, the heating coil 20 is cooled mainly by the cooling gas flowing through the first cooling path 341 and the second cooling path 342.

  In this configuration, the same effects as those of the above embodiments can be obtained. The arrangement of the supply port 151 and the discharge port 152 may be reversed. In this case, the flow of the cooling gas is opposite to the direction of the arrow Y5 shown in FIGS. That is, in this case, the cooling gas supplied from the discharge port 152 as the supply port flows into the second cooling path 342 via the fourth connection path 354 and the third connection path 353, and the second cooling path 342 and The heating coil 20 is cooled by flowing through the first cooling path 341. Thereafter, the cooling gas passes through the second connection path 352 and the first connection path 351, reaches the supply port 151 as the discharge port, and is discharged from the supply port 151. Also by this, a cooling effect equivalent to the above-described configuration can be obtained.

(Sixth embodiment)
Next, a sixth embodiment will be described with reference to FIGS.
The induction heating coil unit 6 of the sixth embodiment is configured on the basis of the induction heating coil unit 1 of the first embodiment, but the dimensions are appropriately changed for each configuration. In the following description, about the structure which needs a substantial change with respect to the induction heating coil unit 1 mentioned above, "E" is attached | subjected to the end of the code | symbol of the structure.

  In the induction heating coil unit 6 of the sixth embodiment, the heating coil 20E is formed in a cylindrical shape that is thicker than the heating coil 20 of the first embodiment. The induction heating coil unit 6 is fixed to the installation surface 100 with screws 134 or the like. The heating object 90 is disposed inside the cylindrical shape of the heating coil 20E. That is, the inner peripheral surface of the heating coil 20 </ b> E is a surface facing the heating object 90, that is, a surface on the heating object 90 side.

  Case 30E is formed in an annular shape as a whole, and has an accommodating space for accommodating heating coil 20E. In this case, the case 30E is configured by combining the first case 31E and the second case 32E. The heating coil 20E is accommodated in the case 30E with the first gap S1, the second gap S2, and the third gap S3. The first gap S1 is a gap formed between the inner circumferential surface of the heating coil 20E and the inner circumferential surface of the first case 31E. The second gap S2 is a gap formed between the outer peripheral surface of the heating coil 20E and the outer surface of the first case 31E, in this case, the outer magnetic shield ring 192E. The third gap S3 is a gap formed between the surface of the heating coil 20E, that is, the surface opposite to the second case 32E and the inner surface on the bottom 311E side of the first case 31E.

  The supply port 151 and the discharge port 152 are connected via a first gap S1, a second gap S2, and a third gap S3. In this case, the first gap S1 functions as the first cooling path 341E. The second gap S2 functions as the second cooling path 342E. The third gap S3 functions as the third cooling path 343. In this configuration, the cooling gas supplied from the supply port 151 circulates through the second cooling path 342E and from the third cooling path 343 to the first cooling path 341E as shown by an arrow Y6 in FIGS. It flows in and goes around the first cooling path 341E. Thereafter, the cooling gas reaches the discharge port 152 and is discharged from the discharge port 152. At that time, the heating coil 20E is cooled by the cooling gas flowing through the cooling paths 341E, 342E, and 343.

As shown in FIG. 18, the induction heating coil unit 6 is suitable for shrink-fitting and joining an annular ring member 91 to a cylindrical heating object 90. That is, the heating object 90 shown in FIG. 18 is formed in a cylindrical shape, for example. Moreover, the ring member 91 is comprised by the annular | circular shape. In this case, the inner diameter of the heating object 90 is set slightly larger than the outer shape of the ring member 91 in the room temperature state. The heating object 90 is arranged inside the induction heating coil unit 6 and is induction heated by the induction heating coil unit 6. Thereby, the heating object 90 is thermally expanded, and the inner diameter of the heating object 90 is slightly larger than the outer shape of the ring member 91. And after the ring member 91 is inserted inside the heating object 90 in a thermally expanded state, the heating object 90 is cooled. Thereby, the internal diameter of the heating object 90 reduces, and the heating object 90 and the ring member 91 are shrink-fitted and joined. The heating object 90 is not limited to the one that is shrink-fitted and joined, and may be, for example, a rod shape.
According to this embodiment, the same effect as each said embodiment is acquired.

(Seventh embodiment)
Next, a seventh embodiment will be described with reference to FIG.
The induction heating coil unit 7 according to the seventh embodiment is configured on the basis of the induction heating coil unit 1 according to the first embodiment, but the size of each component is appropriately changed. In the following description, “F” is appended to the end of the reference numerals of the components that require substantial changes to the induction heating coil unit 1 described above.

  In the induction heating coil unit 7 of the seventh embodiment, the heating coil 20F is formed in a cylindrical shape that is thicker than the heating coil 20 of the first embodiment, like the heating coil 20E of the sixth embodiment. The heating object 90 is disposed on the outer peripheral side of the heating coil 20E. That is, the outer peripheral surface of the heating coil 20 </ b> E is a surface facing the heating object 90, that is, a surface on the heating object 90 side.

  The case 30F is formed in an annular shape as a whole, and has an accommodation space for accommodating the heating coil 20F. In this case, the case 30F is configured by combining the first case 31F and the second case 32F. The heating coil 20F is accommodated in the case 30F with the first gap S1 and the second gap S2. The first gap S1 is a gap formed between the outer peripheral surface of the heating coil 20F and the outer surface of the first case 31F. The second gap S2 is a gap formed between the surface of the heating coil 20F, that is, the surface opposite to the second case 32F, and the inner surface on the bottom 311F side of the first case 31F.

  The supply port 151F and the discharge port 152F are provided at positions near the outer periphery of the second case 32F, that is, at positions facing the first gap S1. The supply port 151F and the discharge port 152F are connected via the first gap S1 or the second gap S2. In this case, the first gap S1 functions as the first cooling path 341F. The second gap S2 functions as a second cooling path 342F.

  In this configuration, the cooling gas supplied from the supply port 151F reaches the discharge port 152F around the first cooling path 341F and the second cooling path 342F as shown by the arrow Y7 in FIG. It is discharged from 152. At that time, the heating coil 20F is cooled by the cooling gas flowing through the cooling paths 341F and 342F.

As shown in FIG. 20, the induction heating coil unit 7 is suitable for heating a cylindrical or container-like heating object 90 from the inside thereof. That is, the heating object 90 shown in FIG. 20 is formed in, for example, a cylindrical container shape. The heating object 90 is arranged so that the induction heating coil unit 7 is inserted inside the object 90 to be heated. Thereby, the induction heating coil unit 7 can induction-heat the heating object 90 from the inside.
According to this embodiment, the same effect as each said embodiment is acquired.

In each of the above embodiments, the shape of the heating coil 20 or the like is not limited to the annular flat plate shape or the cylindrical shape as described above. For example, when the heating target surface of the heating object 90 is a curved surface, the heating coil 20 or the like may be formed in a curved surface in accordance with the heating target surface.
Moreover, each said embodiment can be implemented in combination as appropriate.
Moreover, the induction heating system 40 of 1st Embodiment is applicable also about embodiments other than 1st Embodiment among each embodiment mentioned above.

  As mentioned above, although several embodiment of this invention was described, these embodiment was shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 1, 2, 3, 4, 5, 6, and 7 are induction heating coil units, 141 is a partition part, 142 is a diversion part (partition part and rectification part), and 143 is a merge part (partition part and rectification part). 151, 151F are supply ports, 152, 152F are discharge ports, 18 is a temperature sensor (temperature detection means), 20, 20E, 20F are heating coils, 30, 30A, 30B, 30D, 30E, 30F are cases, 341, 341E and 341F are first cooling paths (cooling paths), 342, 342A, 342B, 342C, 342E and 342F are second cooling paths (cooling paths), 343 is a third cooling path (cooling path), and 37 is a case hole. (Hole) is shown.

The induction heating coil unit according to the embodiment includes a heating coil that heats an object to be heated by induction heating, and a case that houses the heating coil. The case communicates the inside and outside of the case with a supply port for supplying cooling gas supplied from the outside of the case into the case, and communicates the inside and outside of the case with the supply. A discharge port for discharging the cooling gas supplied from the opening into the case to the outside of the case, and the supply port and the discharge port formed between the case and the heating coil. And a cooling path. The cooling path includes a first cooling path formed between the heating object side surface of the heating coil and the case. Alternatively, the cooling path includes a second cooling path formed between the outer periphery of the heating coil and the case and formed along the outer periphery of the heating coil.

The induction heating coil unit according to the embodiment includes a heating coil that heats an object to be heated by induction heating, and a case that houses the heating coil. The case communicates the inside and outside of the case with a supply port for supplying cooling gas supplied from the outside of the case into the case, and communicates the inside and outside of the case with the supply. A discharge port for discharging the cooling gas supplied from the opening into the case to the outside of the case, and the supply port and the discharge port formed between the case and the heating coil. And a cooling path. The cooling path is formed between the surface on the heating object side of the heating coil and the case, a first cooling path for cooling the surface of the heating coil and the inner surface of the case, and the first cooling A second cooling path that communicates with the path and is formed along the outer periphery of the heating coil and that cools the outer periphery of the heating coil between the outer periphery of the heating coil and the case.

Claims (8)

A heating coil for heating an object to be heated by induction heating;
A case for accommodating the heating coil,
The case communicates the inside and outside of the case with a supply port for supplying cooling gas supplied from the outside of the case into the case, and communicates the inside and outside of the case with the supply. A discharge port for discharging the cooling gas supplied from the opening into the case to the outside of the case, and the supply port and the discharge port formed between the case and the heating coil. A cooling path,
Induction heating coil unit The cooling path includes a first cooling path formed between the heating object side surface of the heating coil and the case.
The induction heating coil unit according to claim 1. The cooling path further includes a second cooling path between the outer periphery of the heating coil and the case and formed along the outer periphery of the heating coil.
The induction heating coil unit according to claim 2. In the plan view, the supply port and the discharge port have an acute angle formed by a line connecting the apex and the supply port and a line connecting the apex and the discharge port with the central portion of the heating coil as the apex. In the position,
A partition portion provided in the acute angle side region in the second cooling path to partition between the supply port and the discharge port;
The induction heating coil unit according to claim 3. The supply port and the discharge port are provided on a straight line across the center of the heating coil in plan view,
A rectifying unit for rectifying the cooling gas flowing through the second cooling path at a position corresponding to the supply port and the discharge port in the second cooling path;
The induction heating coil unit according to claim 3. The case is provided corresponding to a central portion of the heating coil and has a hole that penetrates the case in the thickness direction of the heating coil.
The induction heating coil unit according to any one of claims 1 to 5. Two or more each of the supply port and the discharge port,
The induction heating coil unit according to any one of claims 1 to 6. The induction heating coil unit according to any one of claims 1 to 7,
Temperature detecting means capable of detecting the temperature of the heating coil;
A cooling gas supply means capable of supplying a cooling gas to the cooling path;
When the detection result of the temperature detection means is greater than or equal to a preset threshold value, cooling gas is supplied to the cooling path by the cooling gas supply means, and the detection result of the temperature detection means is less than the threshold value A control device capable of performing cooling control to stop the supply of the cooling gas by the cooling gas supply means;
Induction heating system comprising.

Images