JP7074290B2 - Output transformer for induction heating - Google Patents

Description

The present invention relates to an output modifier for induction heating suitable for use in an induction heating device such as an induction heating device and an induction hardening device.

Conventionally, this kind of output transformer is disclosed in, for example, Patent Document 1. This output transformant has a secondary coil having a substantially plate-shaped U-shaped recess by a square copper pipe, a substantially rectangular core arranged in the U-shaped recess of the secondary coil, and a core of this core. A primary coil that is wound between the ring core arranged on the outside, a protrusion protruding from the upper and lower surfaces of the secondary coil of the core, and the ring core, and the outer peripheral surface of the round copper pipe is covered with an insulating material. A heating coil made of a square copper pipe is connected to the secondary coil.

Japanese Patent No. 3644238

However, in such an output modifier, the primary coil, the secondary coil, and the heating coil tend to generate heat due to the energization of a high frequency current. Therefore, in order to cool these, each coil is made of a round copper pipe or a square copper. It is formed of pipes to circulate and supply cooling water inside each pipe. Therefore, it is particularly necessary to use a copper pipe for the primary coil and the secondary coil having a large number of turns as a conductor arranged in the transformer main body.

As a result, each coil cannot use other forms of conductors other than copper pipes, making more effective cooling of each pipe (especially cooling of primary coils with a large number of turns) and, for example, a cover. It is also difficult to use a conductor that can obtain an efficient induction heating state according to the form of the heated object, and it is difficult to sufficiently increase the efficiency of the transformer itself. At the same time, since it is necessary to circulate and supply high-pressure cooling water into the copper pipe, the transformer itself has to be complicated, the amount of cooling water used increases, and the water pressure needs to be increased. It tends to be costly and is not preferable in terms of energy saving.

The present invention has been made in view of such circumstances, and an object thereof is to enable the use of various forms of primary conductors and secondary conductors, and to effectively cool each conductor and to make an efficient induction heating state. It is an object of the present invention to provide an output transformer for induction heating which can sufficiently improve the efficiency of the transformer itself and is excellent in terms of energy saving and cost.

In order to achieve such an object, the invention according to claim 1 of the present invention is a secondary conductor having an opening in the central portion, formed in a substantially plate shape, and to which a heating coil having a form corresponding to the object to be heated is connected. A conductor, a core arranged in a penetrating state through the opening of the secondary conductor, a primary conductor arranged to be wound a predetermined number of times on the protruding portion side of the core from the secondary conductor, and the secondary conductor. A tubular case that covers the outside of the core and the primary conductor, and a pair of lids that close the open end on the primary conductor side and the open end on the secondary conductor side of the tubular case are provided, and the primary conductor side is provided. A supply unit and a discharge unit capable of circulating and supplying cooling water are arranged in the tubular case on a lid that closes the opening end portion of the above, and the cooling water is circulated and supplied in the sealed tubular case. The primary conductor disposed in the tubular case is configured to be coolable, and the supply unit and the discharge unit have a function of supplying a high frequency current to the primary conductor .

The invention according to claim 2 is characterized in that a ring core is disposed on the outside of the core and inside the tubular case, and the primary conductor is disposed on the inside of the ring core. Further, the invention according to claim 3 is characterized in that the supply unit and the discharge unit are arranged corresponding to each space in the tubular case which is divided into two by the secondary conductor. And.

Further, according to the fourth aspect of the present invention, the amount and pressure of the cooling water supplied to the space through the supply unit is one of the spaces in the tubular case depending on the state in the tubular case. It is characterized in that it is set to circulate and circulate in the other space .

The invention according to claim 5 is electrically connected to the pipe-shaped secondary conductor of the heating coil via a lid that closes the opening end on the secondary conductor side of the tubular case. At the same time, the cooling water supplied from the supply unit into the tubular case is circulated and supplied to the inside of the pipe of the heating coil. Further, in the invention according to claim 6 , the primary conductor is formed by winding a plate-shaped, rod-shaped, or flat solid conductor at a predetermined interval, or the outer peripheral surface is made of an insulating material. It is characterized in that it is formed by winding a conductor covered with.

According to the invention according to claim 1 of the present invention, the core is arranged in a penetrating state in the opening at the center of the secondary conductor, and the primary is wound around the outside of the protrusion of the core from the secondary conductor. A conductor, a tubular case, a lid, etc. are provided, and cooling water is circulated and supplied into the sealed tubular case via a lid that closes the opening end on the primary conductor side of the tubular case. Since the primary conductor arranged in the tubular case is configured to be coolable, the primary conductor with a large number of turns can be cooled in the tubular case in a state of being immersed in cooling water, and various types of conductors can be used. In addition, the efficiency of the transformer itself can be sufficiently increased, for example, the conductor can be effectively cooled and an efficient induction heating state can be easily obtained. In addition, the transformer itself can be formed at low cost by simplifying the configuration for supplying cooling water, and low-pressure cooling water can be used to obtain an excellent transformer in terms of energy saving.

In addition, the lid on the primary conductor side is provided with a supply section and a discharge section that can circulate and supply cooling water inside the tubular case, and these supply section and discharge section have the function of supplying high-frequency current to the primary conductor. Therefore, the cooling water supply and discharge sections can have both the cooling water supply / discharge function and the high-frequency current supply function, and the mechanism of the transformer itself can be simplified and inexpensively configured. Can be done .

Further, according to the invention of claim 2 , in addition to the effect of the invention of claim 1 , a ring core is arranged inside the cylindrical case on the outside of the core, and a primary conductor is arranged inside the ring core. Since it is installed, the leakage of magnetic field lines radiated from each conductor by the ring core to the outside of the tubular case can be prevented, the efficiency of the transformer itself can be further improved, and the cylindrical case can be made into a cylindrical shape. It is possible to obtain a transformer with excellent usability .

Further, according to the invention of claim 3 , in addition to the effect of the invention of claim 1 or 2 , each of the supply part and the discharge part in the tubular case in which the supply part and the discharge part are divided into two by the secondary conductor. Since it is arranged corresponding to the space, one space of the tubular case is used as a cooling water supply space and the other space is used as a discharge space, and the cooling water is satisfactorily circulated and distributed in the tubular case (circulation supply). It is possible to further improve the cooling efficiency of each conductor.

Further, according to the invention of claim 4 , in addition to the effect of the invention of claim 3 , the amount and pressure of the cooling water supplied to the space via the supply section and the discharge section are the tubular case. Since the cooling water is set to circulate and circulate from one space in the tubular case to the other space according to the internal state, it is possible to circulate and circulate the cooling water in the tubular case more satisfactorily. Therefore, the cooling effect of each conductor, core, etc. can be further enhanced.

Further, according to the invention of claim 5 , in addition to the effect of the invention of claims 1 to 4 , a pipe shape is provided through a lid that closes the opening end on the secondary conductor side of the tubular case. The heating coil of the above is electrically connected to the secondary conductor, and the cooling water supplied into the tubular case is circulated and supplied to the inside of the pipe of the heating coil from the lid on the secondary conductor side, so that the shape is tubular. The heating coil can be efficiently cooled while effectively utilizing the cooling water supplied in the case.

Further, according to the invention of claim 6 , in addition to the effect of the invention of claims 1 to 5 , the primary conductor is a plate-shaped, rod-shaped, or flat-shaped solid conductor having a predetermined interval. Since it is formed by winding or by winding a conductor whose outer peripheral surface is covered with an insulating material, the number of turns is optimized by using a solid conductor such as a plate as a conductor. The heating efficiency can be further improved by setting it to the minimum, and by using a conductor whose outer peripheral surface is covered with an insulating material such as a coated copper wire, the number of turns (number of turns ratio) can be maximized and transformed. The size of the vessel itself can be reduced.

Schematic cross-sectional view showing an embodiment of an output transformer for induction heating according to the present invention. FIG. 1 is a cross-sectional view taken along the line AA. FIG. 1 is a cross-sectional view taken along the line BB. FIG. 1C-C line arrow view Conceptual diagram showing the high frequency current and the flow of cooling water

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
1 to 5 show an embodiment of an output transformer for induction heating according to the present invention. As shown in FIGS. 1 to 4, the output transformer 1 includes a secondary coil 2 as a secondary conductor, a primary coil 3 as a primary conductor, a rectangular parallelepiped core 4, an annular ring core 5, and a tubular case 6. And a heating coil 7 and the like are provided.

The secondary coil 2 is formed of, for example, a solid copper plate into a substantially flat plate shape for one turn having an opening 2a in the central portion, and a gap 2b is provided between the ends on the heating coil 7 side (left side in FIG. 1). Is formed and has a substantially U-shape in a plan view. The rectangular parallelepiped core 4 is arranged in the opening 2a of the secondary coil 2 in a vertical (front and back) direction, and the upper and lower ends of the core 4 are from the upper and lower surfaces of the secondary coil 2. It protrudes by a predetermined size. The primary coil 3 formed of a copper wire whose outer peripheral surface is covered with an insulating film is wound a predetermined number of times on the outside of each of the upper and lower protrusions 4a of the core 4 from the secondary conductor 2 in a substantially close contact state. ing.

Further, on the outside of the primary coil 3, the ring core 5 formed by connecting a plurality of ring-shaped core single units 5a in the axial direction is disposed, and the outer peripheral surface of the ring core 5 is made of, for example, resin. The tubular case 6 (cylindrical pipe) having a circular cross section is arranged in a fitted state. The lids 8 and 9 are fitted and arranged in the openings 6a and 6b at both ends of the tubular case 6 in a hermetically sealed (airtight) state, whereby, as shown in FIG. 2, the tubular case 6 is fitted and arranged. The inside of 6 is divided into an upper space 10 (one space) and a lower space 11 (the other space) with a flat plate-shaped secondary coil 2 interposed therebetween.

Further, of the pair of lids 8 and 9, the lid 8 on the anti-heating coil 7 side (referred to as the primary coil side) is fitted in the opening 6a on the primary side of the tubular case 6 in an airtight state, and the lid is fitted. As shown in FIGS. 1 and 4, the body 8 has a hose joint 12 as a supply unit formed of a conductor for circulating and supplying (circulating and circulating) cooling water as a cooling medium in the cylindrical case 6. And the hose joint 13 as a discharge portion is arranged in an airtight state.

The hose joints 12 and 13 are used for supplying and discharging cooling water, and as shown in FIGS. 1 and 5, the output terminals of a high-frequency transmitter including a transistor inverter 15 are connected to both hose joints 12 and 13. Are connected via an output cable 16 made of a flexible copper mesh wire or the like. The pair of output cables 16 are arranged in a flexible tube 17 shown in FIG. 5 in a fitted state, and cooling water flows through the flexible tube 17 to be flexible. The pair of output cables 16 in the tube 17 are designed to be cooled.

As a result, as shown by the two-point chain line in FIG. 1, the pair of hose joints 12 and 13 are electrically connected to the transistor inverter 15 so that high-frequency current can be supplied (powered) to the hose joints 12 and 13. At the same time, as shown by the broken line in the figure, the pair of hose joints 12 and 13 and the cooling water supply device 18 are connected via the flexible tube 17, and the cooling water of the cooling water supply device 18 is flexible. It can be distributed in the sex tube 17.

On the other hand, as shown in FIGS. 1 and 3, the heating coil 7 is arranged on the lid 9 on the heating coil 7 side (referred to as the secondary coil side) of the tubular case 6 via the connection plate 20. There is. The heating coil 7 is formed of a square copper pipe (or a round copper pipe), and is provided at a holder portion 7a having a substantially L-shape in a plan view and fixed by pressure contact via an insulating plate 19 and at the tip of the holder portion 7a. For example, it is formed of a circular coil portion 7b in a plan view.

The pair of fixing portions 7a1 to the lid body 9 (hereinafter referred to as the lid body 9 and the like) including the connection plate 20 of the holder portion 7a are brought into close contact with the outer surface of the lid body 9 and the like, and as shown in FIG. The base portion 7a2 of each fixing portion 7a1 is brazed and fixed to the gap 2b end of the secondary coil 2 located in the tubular case 6 via the opening 9a provided in the lid 9 or the like. As a result, the secondary coil 2 and the heating coil 7 are electrically connected in series in a substantially loop shape.

Further, the base end portion 7a3 of each fixing portion 7a is extended in an upside-down direction, and an opening 7c is provided at the tip thereof, and the opening 7c is provided through, for example, the vertically long opening 9a provided in the lid 9 or the like. By communicating with the inside of the tubular case 6, both openings 7c communicate with the upper space 10 and the lower space 11 of the tubular case 6, respectively. As a result, a cooling water flow path is formed between the tubular case 6 and the pipe space of the heating coil 7.

Needless to say, the connection between the heating coil 7 and the secondary coil 2 and the internal spaces 10 and 11 is in an airtight state. Further, the opening 9c of the lid 9 communicating with the opening 7c of the base end portion 7a3 of the heating coil 7 is provided in order to improve the supply of cooling water to the heating coil 7 and the discharge of cooling water from the heating coil 7. For example, it is preferable to set a large area on the upper space 10 and the lower space 11 side of the lid 9 as a cross-sectional pyramid (or cross-sectional cone) shape.

Further, for the electrical connection between the secondary coil 2 and the heating coil 7, columnar protrusions are provided at both ends of the secondary coil 2 made of a plate on the heating coil 7 side, and these protrusions are opened to the lid 9 or the like. It may be connected to the heating coil 7 by penetrating the coil. Further, since it is preferable that the heating coil 7 is detachably connected to the output transformer main body (the lid 9 of the tubular case 6 or the like) for maintenance or the like, the fixing portion of the lid 9 and the heating coil 7 is fixed. The connection plate 20 described above is disposed between the 7a1 and the lid 9 and the heating coil 7 are electrically and mechanically detachably connected and fixed. The configuration of the connection plate 20 is not limited to the illustrated example, and for example, a connection plate 20 having an appropriate shape and configuration can be adopted.

FIG. 5 schematically shows the flow of high-frequency current and the flow path of cooling water. That is, the high-frequency current flows through the primary coil 3 as shown by the solid wire a, and the current induced in the secondary coil 2 is supplied to the heating coil 7. Further, as shown by the broken line b, most of the cooling water supplied from the hose joint 12 of the lid 8 into the upper space 10 is the gap 2b of the secondary coil 2 or the secondary coil 2 and the core 4 or the ring core. It flows into the lower space 11 through a gap (not shown) or the like with 5.

Further, a part of the cooling water circulates in the copper pipe of the heating coil 7 through one opening of the lid 9 and the like and the opening 7c of one base end portion 7a3 of the heating coil 7, and is inside the heating coil 7. The cooling water flowing through the heating coil 6 is returned to the lower space 11 of the tubular case 6 through the opening 7c of the other base end 7a3 of the heating coil 6 and the other opening of the lid 9 and the like. That is, the cooling water is circulated and supplied to the heating coil 7.

By the way, in order to circulate and supply the cooling water into the copper pipe of the heating coil 7, an opening is provided in the lid 9 or the like to communicate the internal spaces 10 and 11 with the fixing portion 7a1 (base end portion 7a3) of the heating coil 7. Not limited to the configuration to be made, for example, it can be configured as follows. That is, a branch portion (not shown) is provided inside the hose joints 12 and 13 of the lid body 8, and a cooling water pipe (not shown) is provided in one of the branch portions (the other communicates with the spaces 10 and 11). By connecting and directly connecting the other end of the cooling water pipe to the opening 7c of the base end portion 7a3 of the heating coil 7 through the opening of the lid 9 or the like, the cooling water is directly connected to the hose joints 12 and 13 and the cooling water pipe. It may be circulated and supplied to the heating coil 7 via the above.

Next, the usage and operation of the output transformer 1 configured in this way will be described. First, the output transformer 1 is used by being connected to a high-frequency induction heating device incorporating a transistor inverter 15 and a cooling water supply device 18 by the flexible tube 17. At this time, the output cable 16 in the flexible tube 17 is electrically connected to the output terminal of the transistor inverter 15, and the flexible tube 17 in which the pair of output cables 16 is built is connected to the cooling water supply device 18. By connecting in an airtight state, the cooling water is set to be circulated and circulated in the flexible tube 17.

The amount, water pressure, etc. of the cooling water supplied from the circulation pump of the cooling water supply device 18 into the flexible tube 17 are the primary coils in the form of the upper space 10 and the lower space 11 of the output transformant 1. Depending on the number of turns and winding state of 3, the size of the core 4, the thickness of the secondary coil 2, the inner diameter of the tubular case 6 (that is, the gap state of the spaces 10 and 11), etc., in each of the spaces 10 and 11. Preconfigured to produce good cooling water flow.

In this state, for example, an object to be heated as a work to be quenched is positioned in the coil portion 7b of the heating coil 7 of the output transformer 1, and the transistor inverter 15 and the cooling water supply device 18 are operated. When the transistor inverter 15 operates, a high-frequency current is supplied to the primary coil 3 via the output cable 16, hose joints 12, and 13, and is coupled via the core 4 by energizing (feeding) the primary coil 3. A large current corresponding to the turns ratio is induced in the secondary coil 2. This large current is supplied to the coil portion 7b of the heating coil 7 connected to the secondary coil 2, and the energization of the coil portion 7b induces an eddy current in the object to be heated, so that the object to be heated is generated. Induction heating.

Further, by operating the cooling water supply device 18 at the same time as the operation of the transistor inverter 15, the cooling water flows from the flexible tube 17, the opening of one hose joint 12, the upper space 10, the lid 9, etc., and the heating coil 7. The opening 7c of one fixing portion 7a1 (base end portion 7a3), the coil portion 7b, the opening 7c of the other fixing portion 7a1 (base end portion 7a3) of the heating coil 7, and the other opening of the lid 9 and the like, the lower space. 11. The other hose joint 13, the flexible tube 17, and the circulation, that is, the cooling water is circulated and supplied to the output transformer 1. As a result, the primary coil 3, the secondary coil 2, the heating coil 7, and the like, which tend to generate heat due to the energization of the high frequency current, are cooled, and the decrease in the induction heating efficiency due to the heat generation is suppressed.

That is, in the case of the output transformant 1, the primary coil 3, the secondary coil 2, the core 4, the ring core 5, etc. are sealed and built in the cylindrical tubular case 6, and the upper space 10 in the cylindrical case 6 and By circulating and circulating the cooling water in the lower space 11, each coil 2, 3 and each core 4, 5 are cooled in the cooling water in a state of being immersed. In particular, the tubular case 6 is divided into two by a flat plate-shaped secondary coil 2 to form an upper space 10 and a lower space 11, and the upper space 10 is used for supplying cooling water and the lower space 11 is used for discharging cooling water. By setting the amount of cooling water, water pressure, etc. to predetermined values corresponding to the internal structure of the tubular case 6, the inside of the tubular case 6 in which each coil 2, 3, core 4, 5, etc. is built. The cooling water can be circulated and circulated smoothly.

As described above, according to the output modifier 1, the core 4 is arranged in a penetrating state in the opening 2a at the center of the secondary coil 2, and the core 4 is wound around the protruding portion 4a from the secondary coil 2. A sealed primary coil 3, a tubular case 6, lids 8, 9, a heating coil 7, and the like are provided, and the tubular case 6 is sealed via a lid 8 that closes one open end of the tubular case 6. Since the secondary coil 2 and the primary coil 3 arranged in the tubular case 6 are configured to be coolable by circulating and circulating the cooling water in the tubular case 6, each coil 2, 3 etc. Can be cooled by being immersed in the cooling water in the tubular case 6, and various forms of conductors other than the copper pipe can be used as the coils 2 and 3.

As a result, it is possible to effectively cool the primary coil 3 having a particularly large number of turns, and an efficient induction heating state can be easily obtained for each coil 2 and 3, and the efficiency of the output transformer 1 itself is sufficiently high. It can be enhanced. Further, since it is not necessary to circulate the cooling water in a thin pipe having a large number of turns and a long flow path as in the conventional case, the configuration for circulating and circulating the cooling water is simplified, and the output modifier 1 is provided. It is possible to obtain an output transformer 1 which can be formed at low cost, can use low-pressure cooling water, and is excellent in energy saving.

Further, since the ring core 5 is arranged on the outside of the core 4 and inside the cylindrical tubular case 6, and the primary coil 3 is arranged on the inside of the ring core 5, the ring core 5 is used from each coil 2 and 3. Leakage of the radiated magnetic field lines to the outside of the tubular case 6 can be prevented, the efficiency of the output transformer 1 itself can be further improved, and the cylindrical case 6 can be formed into a cylindrical shape, so that the cooling water has a low pressure. Even in this case, it is possible to easily obtain the output transformer 1 which can prevent the cooling water from staying in the cylindrical case 6, improve the circulation and circulation, and have excellent usability.

Further, a hose joint 12 and a hose joint 13 capable of circulating and supplying cooling water in the tubular case 6 are arranged on the lid 8 on the primary coil 3 side, and the hose joints 12 and 13 connect the high frequency current to the primary coil 3. Since the hose joints 12 and 13 have both a function of supplying and discharging cooling water and a function of supplying high-frequency current, the mechanism of the output transformer 1 can be simplified. It can be configured inexpensively.

Further, since the hose joints 12 and 13 are arranged corresponding to the upper space 10 and the lower space 11 in the tubular case 6 which is divided into two by the substantially plate-shaped secondary coil 2, the cylinder is formed. The upper space 10 of the shape case 6 can be used as a cooling water supply space and the lower space 11 can be used as a discharge space, so that the cooling water can be satisfactorily circulated and circulated in the cylindrical case 6. In particular, the amount and pressure of the cooling water supplied to the spaces 10 and 11 via the hose joints 12 and 13 is adjusted according to the state inside the tubular case 6, and the cooling water is applied to the upper space 10 in the tubular case 6. Since it is set to circulate and circulate (circulate and supply) from the lower space 11 to the lower space 11, the cooling water can be circulated and circulated more smoothly in the tubular case 6, and the coils 2, 3 and the core 4 can be circulated. The cooling effect of 5 or the like can be sufficiently enhanced.

Further, a pipe-shaped heating coil 7 is electrically connected to the secondary coil 2 through the opening of the lid 9 that closes the opening end of the cylindrical case 6, and a cylinder is formed inside the pipe of the heating coil 7. Since the cooling water supplied in the cylindrical case 6 circulates and circulates, the heating coil 7 can be effectively cooled while effectively utilizing the cooling water supplied in the cylindrical case 6. Further, if the hose joints 12 and 13 of the lid 8 on the primary coil side of the tubular case 6 are directly circulated and supplied to the inside of the pipe of the heating coil 7 via a dedicated pipe, the cooling effect of the heating coil 7 can be obtained. It can be further enhanced. Further, by using a conductor in which the outer peripheral surface is covered with an insulating material such as a coated copper wire, the primary coil 3 can maximize the number of turns and can reduce the size of the output transformer 1 itself.

The form of the primary coil 3 and the secondary coil 2 according to the present invention is not limited to the use of an insulatingly coated copper wire (electric wire). For example, the primary coil 3 is made of a copper plate, rod, or flat. It can also be formed as a solid conductor by winding it at a predetermined interval. In this case, the number of turns can be set to the minimum and optimum, the current flowing on the surface of the conductor can be increased, the cooling efficiency of the surface can be improved, and the heating efficiency of the output transformer 1 can be further improved. Can be done.

Further, the form of the coil portion 7b of the heating coil 7 is not limited to the illustrated example, and an appropriate structure can be adopted depending on the form of the object to be heated. Further, the core 4 is not limited to the configuration in which one rectangular parallelepiped-shaped core 4 is used, and a plurality of rectangular parallelepiped-shaped or thin plate-shaped cores 4 may be continuously provided in the axial direction of the tubular case 6. In this case, for example, the outer diameter of the tubular case 6 can be made smaller and the length can be made longer, and the output transformer 1 having better usability can be obtained.

Further, in the output transformer 1 according to the present invention, depending on the form of the coils 2, 3 and the cores 4, 5 built in the tubular case 6, a shielding plate or fin having an appropriate shape in the tubular case 6 Etc. (not shown) may be arranged to promote the circulation and circulation of the cooling water. In this case, when there is a relatively large space in the cylindrical case 6, it is preferable to dispose a shielding plate or fins so that a spiral flow can be generated in the space.

Further, in the above embodiment, the tubular case 6 is fitted and inserted in close contact with the outer peripheral side of the ring core 5, but for example, a predetermined gap is secured between the outer peripheral surface of the ring core 5 and the inner surface of the tubular case, and this gap is secured. Cooling water may be configured to be circulated inside. By doing so, the outer peripheral surface side of the ring core 5 can also be cooled by the cooling water, and the cooling water can also have a function as a cushioning material when an impact is applied to the tubular case 6.

Further, the positions and numbers of the hose joints 12 and 13, the form of the cylindrical case 6, the form of the lids 8 and 9, the number of turns of the primary coil 3 and the secondary coil 2 and the like in the above embodiment are examples. For example, the inventions related to the present invention include increasing the number of hose joints, making the tubular case 6 into a square cylinder, and making the lids 8 and 9 a double structure to further improve the airtightness inside the tubular case 6. It can be changed as appropriate without departing from the gist of.

INDUSTRIAL APPLICABILITY The present invention can be suitably used for a portable output transformer used for inductively heating the outer surface, inner surface, etc. of objects to be heated of various shapes, but the present invention is fixedly arranged in an induction heating device. It can also be used for output transformers.

1 ... Output transformer, 2 ... Secondary coil, 2a ... Opening, 2b ... Gap, 3 ... Primary coil, 4 ... Core, 4a ... Projection, 5, ... Ring core, 5a ... Core unit, 6 ... Cylindrical case, 6a, 6b ... Opening, 7 ... Heating coil, 7a ... Holder part, 7a1 ... Fixed part, 7a2 ... .. base, 7a3 ... base end, 7b ... coil, 7c ... opening, 8, 9 ... lid, 9a ... opening, 10 ... upper space, 11 ...・ Lower space, 12, 13 ... hose joint, 15 ... transistor inverter, 16 ... output cable, 17 ... flexible tube, 18 ... cooling water supply device, 19 ... insulation Board, 20 ... Connection board.

Claims (6)

A secondary conductor having an opening in the central portion and formed in a substantially plate shape to which a heating coil having a shape corresponding to the object to be heated is connected, and a core arranged in a penetrating state through the opening of the secondary conductor. A primary conductor that is wound and arranged a predetermined number of times on the protruding portion side of the core from the secondary conductor, a tubular case that covers the outside of the secondary conductor, the core, and the primary conductor, and a primary conductor of the tubular case. A pair of lids that close the open end on the side and the open end on the secondary conductor side .
A supply unit and a discharge unit capable of circulating and supplying cooling water are arranged in the tubular case on a lid that closes the opening end on the primary conductor side, and the cooling water is supplied into the sealed tubular case. By circulating the supply, the primary conductor arranged in the tubular case is configured to be coolable, and the supply unit and the discharge unit have a function of supplying a high frequency current to the primary conductor . A characteristic output transformer for induction heating. The output transformer for induction heating according to claim 1, wherein the ring core is disposed on the outside of the core and inside the tubular case, and the primary conductor is disposed on the inside of the ring core. .. The induction according to claim 1 or 2, wherein the supply unit and the discharge unit are arranged corresponding to each space in the tubular case divided into two by the secondary conductor. Output transformer for heating. The amount and pressure of the cooling water supplied to the space through the supply unit are set so as to circulate and circulate from one space in the tubular case to the other space according to the state in the tubular case. The output modifier for induction heating according to claim 3, wherein the device is characterized by the above. The tubular case is electrically connected to the pipe-shaped secondary conductor of the heating coil via a lid that closes the opening end on the secondary conductor side, and inside the pipe of the heating coil. The output transformer for induction heating according to any one of claims 1 to 4, wherein the cooling water supplied from the supply unit into the tubular case is circulated and supplied . The primary conductor is formed by winding a plate-shaped, rod-shaped, or flat solid conductor at a predetermined interval, or by winding a conductor whose outer peripheral surface is covered with an insulating material. The output transformer for induction heating according to any one of claims 1 to 5, wherein the output transformer is characterized in that .

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