JPH11144975A - Transformer fro supplying power to high frequency heating coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer for supplying a power to a high frequency heating coil of a structure which is capable of being thinned. SOLUTION: For a disk-type transformer for supplying power to a high frequency heating coil, a coil part 10 comprising a first primary coil 100 and second primary coil 150 and secondary coil 200 of ring disk shape formed by bending a square-pipe like conductor whose inside is a water channel for cooling on an identical plane, and a core 300 so provided as to almost cover the outer periphery of the coil part 10 are provided, with the secondary coil 200 provided on the outside surface side of the first primary coil 100, while a second primary coil 150 on the outside surface side of the secondary coil 200. Each end parts 100a, 100b, 150a, 150b, 200a, and 200b of the coil part 10 (that is, the primary coil 100 and the second primary coil 150 and secondary coil 200) is drawn out from a part, where no core 300 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for an induction hardening device for hardening a crankshaft or the like, and for feeding a high frequency heating coil of a disk type for supplying power to the high frequency heating coil of the induction hardening device. For transformers.

[0002]

2. Description of the Related Art Conventionally, a transformer 900 for feeding a high-frequency heating coil of an induction hardening apparatus used for quenching a crankshaft or the like is formed in a disk shape.
As shown in [Front schematic view], for example, the journal J
With respect to the high-frequency heating coils 950 arranged for each of 1 to J4, the high-frequency heating coil power supply transformer 900 is provided side by side on the upper side such that the thinner direction of the high-frequency heating coil power supply transformer 900 becomes the longitudinal direction of the crankshaft W. It supplies current corresponding to the depth of entry.

This high frequency heating coil power supply transformer 90
Numeral 0 is suspended from a suspension fixture 1100 provided from the base via a position adjusting mechanism 1000. For example, when the size of the crankshaft W is changed, the position adjusting mechanism 1000 moves in the left-right direction (longitudinal direction of the crankshaft W) in FIG. The position of the high-frequency heating coil 950 and the high-frequency heating coil power supply transformer 900 is adjusted, and the position of the high-frequency heating coil 950 and the high-frequency heating coil power supply transformer 900 are adjusted vertically according to the thickness of the shaft portion of the crankshaft W. It is for doing.

When the position adjusting mechanism 1000 is to function for the pins P1 to P3 of the crankshaft W, for example, it follows the rotation and revolution of the pins P1 to P3 during quenching, in addition to the above-described positioning. The high-frequency heating coil 950 and the high-frequency heating coil power supply transformer 900
It also works to swing up, down, back and forth.

[0005]

As described above, at least the necessary number of transformers 900 for supplying high-frequency heating coils are arranged in the longitudinal direction of the crankshaft W, which is a workpiece, as required for simultaneous quenching.

[0006] However, the size of the crankshaft W, which is a work, tends to be reduced, and therefore, the thickness of the high-frequency heating coil power supply transformer 900 needs to be reduced.

However, as shown in FIG. 10 (cross-sectional view), a coil body portion 901 which is the main structural part of the conventional transformer 900 for supplying power to a high-frequency heating coil and occupies most of its thickness is used for cooling. A ring-shaped secondary coil 920 having a water passage 921;
Front side (upper side in FIG. 10) and back side (lower side)
Primary coils 910, 910 formed in a ring disk shape by bending rectangular conductors each having an internal cooling water passage 911 on the same plane (a plane in the front-rear direction in FIG. 10). And this primary coil 9
It has an insulating plate (not shown) provided between the secondary coil 10 and the secondary coil 920, and a core 930 disposed so as to substantially cover the outer periphery thereof. The coil body 901 is housed in a resin case (not shown) such as FRP.

Therefore, in the high-frequency heating coil power supply transformer 900 having the above structure, when the thickness is reduced, the primary coil 910 and the secondary coil 92 are mainly used.
The thickness of each of the primary coil 910 and the core 930 is reduced, but both the primary coil 910 and the secondary coil 920 have cooling water passages 911 and 921 therein, and these coils 910 and 920 need to be efficiently cooled. For this reason, and because it is necessary to efficiently flow a high-frequency current, there is a limit to the reduction in thickness of each device.

An object of the present invention is to provide a high-frequency heating coil power supply transformer having a structure that can be thinned.

[0010]

In order to solve the above-mentioned problems, a high-frequency heating coil power supply transformer according to the present invention comprises:
A disk-type transformer for supplying power to a high-frequency heating coil, comprising: a ring-disk-shaped first primary coil formed by curving a rectangular tubular conductor having a cooling water passage therein on the same plane; A second primary coil and a secondary coil, wherein the secondary coil is disposed on an outer side of the first primary coil, and the second primary coil is disposed on an outer side of the secondary coil. And

Therefore, in the case of the transformer for feeding a high-frequency heating coil according to the present invention, the primary coil, which is one of the main factors for increasing the thickness of the transformer for feeding a high-frequency heating coil, is connected to the front side (upper part) of the secondary coil. Side) and back side (lower side)
Instead, the overall thickness is reduced by arranging it on the side surface of the secondary coil.

Further, a high frequency heating coil power supply transformer according to the present invention has a coil portion having the first primary coil, the second primary coil, and the secondary coil, and substantially covers the outer periphery of the coil portion. , The secondary coil is disposed on the outer surface side of the first primary coil, the second primary coil is disposed on the outer surface side of the secondary coil, It is assumed that the end of the portion is extended from a portion where the core is not provided.

That is, in the case of the transformer for feeding a high-frequency heating coil according to the present invention, the thickness of the core disposed so as to substantially cover the outer periphery of the coil portion is dimensionally increased above and below the coil portion such as a secondary coil. First, by forcibly joining
An end portion of the first primary coil is taken out from a portion where the core is not provided to the side of the high frequency heating coil power supply transformer across the secondary coil and the second primary coil.

Therefore, in the case of the transformer for feeding a high-frequency heating coil according to the present invention, the end of the first primary coil straddles the secondary coil and the second primary coil and the side of the transformer for feeding a high-frequency heating coil. By setting the dimension that is required to be taken out to the thickness direction to be, for example, within the thickness of the core above and below the coil portion, it is possible to prevent a reduction in the thickness of the entire high-frequency heating coil power supply transformer.

[0015] For the same reason, the end of the secondary coil is then fed from the portion where the core is not disposed to the portion where the second primary coil is disposed to supply the high frequency heating coil. Take out to the side of the transformer. The second primary coil is also taken out of the portion where the core is not provided to the side of the high frequency heating coil power supply transformer.

In the high frequency heating coil power supply transformer according to the present invention, the first primary coil and the second primary coil are arranged separately on the inner side and the outer side of the secondary coil. Instead, they may be arranged in accordance with the inner side or the outer side of the secondary coil.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A high-frequency heating coil power supply transformer according to an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic side view showing a coil part and a core of a high frequency heating coil power supply transformer according to an embodiment of the present invention, FIG. 2 is a schematic sectional view taken along line AA in FIG. 1, and FIG. FIG. 4 is a schematic cross-sectional view illustrating a high-frequency heating coil power supply transformer according to an embodiment of the present invention.
FIG. 5 is a schematic cross-sectional view taken along line CC of FIG. 3, and FIG. 6 is a schematic cross-sectional view illustrating a coil section taken along line DD of FIG.

A transformer for feeding a high-frequency heating coil according to an embodiment of the present invention, as shown in FIGS.
A disk-type transformer for supplying power to a high-frequency heating coil, wherein the first rectangular coil-shaped primary coil 100 is formed by curving a rectangular tubular conductor having a cooling water passage therein on the same plane. And the second primary coil 15
0 and a secondary coil 200, and a core 30 disposed so as to substantially cover the outer periphery of the coil 10.
0, 300, and the secondary coil 200 is disposed on the outer side of the first primary coil 100, and the second primary coil 1
Reference numeral 50 is arranged on the outer side of the secondary coil 200.

The coil unit 10 (ie, the first primary coil 100, the second primary coil 150, and the secondary coil 2)
00) of each end 100a, 100b, 150a, 150
b, 200a, and 200b are drawn out of the portion where the core 300 is not provided.

The other parts of the configuration of the high frequency heating coil power supply transformer according to the embodiment of the present invention are basically the same as the registered utility model No. 251060 of the present applicant. That is, as shown in FIG. 3, the high-frequency heating coil power supply transformer according to the embodiment of the present invention includes:
A rectangular rod-shaped insulating holding member 500, which has a coil portion 10 and a core 300 disposed so as to substantially cover the coil portion 10 and supported on both sides thereof;
A connecting plate 550 that connects the components 500 at the upper side and that connects the entire high-frequency heating coil power supply transformer to the position adjusting mechanism 1000 in FIG. 9 is provided between the connecting plate 550 and the coil unit 10. A bus bar 600, a plurality of switching taps 650 provided between the bus bar 600 and the first primary coil 100 and between the bus bar 600 and the second primary coil 150; A pair of leads 700 connected to the start end 200a and the end 200b, and an insulating resin case 800 that covers the coil part 10, the core 300, and the holding member 500, and integrally molds the leads 700 are provided. .

The first primary coil 100 is, for example, a coil of approximately six turns (see FIG. 2) whose outer periphery is coated with an insulating paint (not shown), and has a two-stage structure.
The winding is arranged on the upper side (the upper side in FIG. 2; hereinafter, this direction is referred to as the upper side in the coil according to the embodiment of the present invention), and the remaining approximately three windings are arranged on the lower side. I have. The winding directions at this time are unified, and all the currents flow in the same direction.

The starting end 100a of the first primary coil 100
The terminal portion 100b is located on the right side (the front side of the high frequency heating coil power supply transformer) in FIG. 3 so as to straddle the secondary coil 200 and the second primary coil 150 in a portion where the core 300 is not provided. It is pulled out and fixed to a through hole provided in the holding member 500,
Hose ports (not shown) are respectively connected. The hose port (not shown) is provided so as to protrude from a through hole provided in the resin case 800 so that a water pipe (not shown) from the outside can be connected.

The outer periphery of the secondary coil 200 is coated with an insulating paint (not shown), and its height dimension extends over substantially the entire length, for example, as shown in FIG. The single-turn coil has the same dimension h as the dimension h from the upper end of one primary coil 100 to the lower end of the lower first primary coil 100. However, the start end 200a (see FIG. 1) and the end 200b of the secondary coil 200
No. 00 is formed so as to protrude below the high frequency heating coil power supply transformer, and its thickness dimension is set smaller than the dimension h (see FIG. 5).

The start end 200a and the end 200b of the secondary coil 200 are electrically connected to the upper side of the lead 700.
Physically connected.

As shown in FIG. 3, pipes 250, 2
51 are connected. The tip portions 250a, 251a of the pipes 250, 251 are pulled out to the right side (the front side of the high-frequency heating coil power supply transformer) in FIG.
It is fixed to a through hole provided in the holding member 500, and hose ports (not shown) are respectively connected. The hose port (not shown) is provided so as to protrude from a through hole provided in the resin case 800 so that a water pipe (not shown) from the outside can be connected.

A not-shown partition is provided in the cooling water passage inside the secondary coil 200, and the cooling water injected from the pipe 250, for example, is used by the partition to cool the cooling water inside the secondary coil 200. After being circulated through the entire length of the tube with good cooling efficiency, the liquid is led out from the pipe 251 side.

The second primary coil 150 has a cross section similar to that of the first primary coil 100 and has, for example, a substantially four-turn coil (see FIG. 2), and has a two-stage structure. Are disposed on the upper side, and the remaining approximately two turns are disposed on the lower side. The winding directions at this time are unified, and all the currents flow in the same direction.

Start end 150a of second primary coil 150
The end portion 150b is pulled out to the right side (the front side of the high frequency heating coil power supply transformer) in FIG. 3 in a portion where the core 300 is not provided, and is fixed to a through hole provided in the holding member 500. , A hose port (not shown) is connected. The hose port (not shown) is provided so as to protrude from a through hole provided in the resin case 800 so that a water pipe (not shown) from the outside can be connected.

Further, the second primary coil 150 is bent and disposed so as to straddle up and down as shown in FIG. 5 at the position where the start end 200a and the end 200b of the secondary coil 200 meet. I have.

The terminal 150b of the second primary coil 150
Between the first end of the first primary coil 100 and the start end 100a of the first primary coil 100 at a point where the end 150b and the start end 100a cross three-dimensionally (for example, point Q). Are electrically and physically connected via As a result, the winding directions of the first primary coil 100 and the second primary coil 150 are unified, and all the currents flow in the same direction.

The thus formed first primary coil 1
00 and the second primary coil 150 and the secondary coil 20
0, an insulating thin plate (not shown) is sandwiched. In this state, the first primary coil 100, the secondary coil 200, and the second primary coil 150 are separated from each other at a portion where the core 300 and the switching tap 650 are not provided.
If necessary, cover with insulating and rigid resin bond (not shown)
Mutually fixed.

As shown in FIGS. 1, 2 and 3, the core 300 has a coil portion 10 having a first primary coil 100, a second primary coil 150, and a secondary coil 200.
Is provided so as to cover the integral part of the central part of the. FIG.
, The dimension from the upper end to the lower end of the core 300 is f. This dimension f is the same as the inner dimension of the resin case 800 in the thickness direction (its maximum value). As shown in FIG. 6, the first primary coil 100 and the second primary coil 15
0 means that the ends 100a, 100b, 150a, 15
The thickness dimension c occupied by 0b is set smaller than the dimension f.

As shown in FIGS. 3 and 4, a plurality of switching taps 650 are provided, and one end of each of the switching taps 650 is electrically connected to each of the first primary coil 100 and the second primary coil 150 having different numbers of turns. Physically connected. The other end of the switching tap 650 is drawn out to the bus bar 600 while leaving a slight gap so as not to come into contact with the coil portion 10 located in the middle thereof. In addition, this switching tap 6
Reference numeral 50 denotes a first primary coil 10 as shown in FIG.
In addition to the upper side of the 0 and the second primary coils 150, the lower and upper sides (the back side in FIG. 3) are installed at necessary places.
At this time, as shown in FIG.
The dimension in the thickness direction of the bus bar 600 and the switching tap 650 is set such that the dimension a from the upper end of 50 to the lower end of the switching tap 650 is smaller than the dimension f.

The other end 650a of the switching tap 650 (FIG. 4)
) Is bent toward the bus bar 600 side, but the bus bar 600 is not directly contacted with the bus bar 600.
It is arranged floating above the surface. The other end 65
0a has a shape inclined to one side as shown in FIG. 3 so that a spacer 670 described later can be easily inserted and removed.

As shown in FIGS. 3 and 4, the bus bar 600 is made of a three-layered flat plate formed by sandwiching an insulating plate 600b between two good conductive plates 600a and 600a, and is the same as the connecting plate 550. Are fixed on the lower surface of the connecting plate 550 and the holding member 500. One side end 601 of the bus bar 600 extends outward through a through hole formed in the holding member 500 for connection of a power cable.

On both surfaces of the bus bar 600, projections 610 having good conductivity are provided so as to correspond to the switching taps 650. The convex portion 610 and the other end portion 650 of the switching tap 650
4A, a spacer 670 is inserted as shown in FIG.

The spacer 670 is prepared in two types, one having good conductivity and the other having insulation. There is only one pair of spacers 670 having good conductivity. A pair of switching taps 65 into which the highly conductive spacer 670 is inserted
In the case of No. 0, the spacer 670 having good conductivity is fixed by a fastening part such as a screw (not shown). Thereby, the first
Primary coil 100 and / or second primary coil 1
50 is in a state selected by the switching taps 650, 650 by a predetermined number of turns. That is, the first primary coil 100 and / or the second primary coil 150
, A high frequency current from an external power supply can be supplied to only a predetermined number of turns.

On the other hand, the insulating spacer 670 is
In order to prevent contact between the switching tap 10 and the switching tap 650, a spacer 670 of good conductivity is inserted into the switching tap 650 that has not been inserted. In the bus bar 600, portions other than the side end portions 601 and the protruding portions 610 are painted with an insulating paint (not shown).

The connecting plate 550 is provided with a round hole 551 for suspending the entire high frequency heating coil power supply transformer.

As shown in FIGS. 3 and 5, the lead 700 has a top end 2 of the secondary coil 200 on its upper side.
Terminal portions 701 and 702 for electrically and physically connecting each end of the end portion 200a and the terminal portion 200b are protruded.
The terminal portions 701 and 702 are provided so as to be shifted from each other in the thickness direction of the lead 700, the terminal portion 701 is connected to the upper surface side of the starting end 200 a of the secondary coil 200, and the terminal portion 702 is connected to the secondary coil 200. It is connected to the lower surface side of the termination part 200b. The terminal portion 701 and the terminal portion 702 are separated from each other over the entire center of the lead 700 in the thickness direction.
As shown in FIG. 5, an insulating plate 705 is provided.

The reed 700 has a water passage 73 therein.
0 are provided, one end of which is a pipe 750, 7
50. The other end of the pipe 750 is shown in FIG.
It is pulled out to the right side (the front side of the high frequency heating coil power supply transformer) and is fixed to a through hole provided in the resin case 800, and hose ports (not shown) are respectively connected. The hose port (not shown) is provided so as to protrude from a through hole provided in the resin case 800 so that a water pipe (not shown) from the outside can be connected.

The other end of the water passage 730 is guided to a lower part of the lead 700. A guide pin 760 is provided on the side surface of the lead 700, and performs positioning when the upper side of the high-frequency heating coil 950 shown in FIG. 9 is attached. In this case, the lead portion on the upper side of the high-frequency heating coil 950 is fixed to a screw hole 770 provided on the lower end side of the lead 700 with a screw (not shown). In addition, lead 7
The dimension b in the thickness direction of 00 (see FIG. 5) is set to be smaller than the dimension f.

As shown in FIG. 3, the resin case 800 covers components below the lower end of the switching tap 650. That is, the resin case 800 includes the upper side of the switching tap 650, the bus bar 600, and the connecting plate 5.
50 and the upper end side of the holding member 500 are not covered. Therefore, it is easy to replace the spacer 670 inserted between the switching tap 650 and the projection 610 with a good conductive material or an insulating material.

The thickness of the high-frequency heating coil power supply transformer according to the embodiment of the present invention and the thickness of the conventional high-frequency heating coil power supply transformer will be compared below. Here, since the resin case 800 is required in common, the thickness of the resin case 800 itself can be ignored. Therefore, the comparison is made based on the inner dimension of the resin case 800 in the thickness direction (indicating the minimum value). .

In the transformer for feeding a high-frequency heating coil according to the embodiment of the present invention, the inner dimension in the thickness direction of the resin case 800 is the same as the dimension f from the upper end to the lower end of the core 300 as described above. 2 and FIG. 10, as can be seen, the primary coil 910 in the conventional high-frequency heating coil power supply transformer and the first primary coil 100 (or the first primary coil 100) in the high-frequency heating coil power supply transformer according to the embodiment of the present invention. The two primary coils 150) can be considered to have the same thickness dimension. Similarly, core 300 and core 930 can be considered to have the same thickness dimension.

Therefore, the conventional high frequency heating coil power supply transformer is equal to or more than [dimension f + thickness dimension of secondary coil 921]. Therefore, the high-frequency heating coil power supply transformer according to the embodiment of the present invention can reduce the thickness dimension by at least the thickness dimension of the secondary coil 921.

For reference, the dimensions of the current product (that is, the product of the prior art) are described below.
The thickness of 10 (for one turn) is 5 mm and its width is 8 mm. The thickness dimension of the secondary coil 921 is
10 mm. Among the thickness dimensions of the core 930, the thickness of the portion where the primary coil 910 and the secondary coil 921 are stacked is 9 mm × 2 = 18 mm as a pair. The thickness of the insulator such as an insulating plate (not shown) is 1 m per one place.
m × 4 places = 4 mm. The sum of these is 42 mm
Becomes

On the other hand, when this dimension is applied to the high-frequency heating coil power supply transformer according to the embodiment of the present invention, f = 31 mm. Therefore, the dimension f
, That is, the inner dimension in the thickness direction of the resin case 800 is
This can be reduced to about 74% of the conventional size.

The structure and the like of the high-frequency heating coil power supply transformer according to the embodiment of the present invention described above are merely representative examples.
It does not restrict that c becomes larger than the dimension f from the upper end to the lower end of the core 300. This means that the reduction in the thickness dimension as compared with the related art is reduced only by the presence of the dimension larger than the dimension f.

In the transformer for supplying power to the high-frequency heating coil according to the embodiment of the present invention, a plurality of hose ports not shown (that is, the starting end 100a of the first primary coil 100, etc.).
Are arranged on the right side (the front side of the transformer for feeding high-frequency heating coils) in FIG. 3, but may be arranged on the opposite side (the front side of the transformer for feeding high-frequency heating coils) or on the left and right sides. They may be arranged separately.

In the transformer for feeding a high-frequency heating coil according to the embodiment of the present invention, an example is shown in which the first primary coil 100 and the second primary coil 150 are a total of 10 turns. For example, the first primary coil 100 and the second primary coil 150 may each have five turns, or may have another number of turns.

The number of turns of the first primary coil 100 and the second primary coil 150 is changed as required in addition to the total of 10 turns.

The first primary coil 100 and the second primary coil 150 have a relatively small total number of turns, and if there is no problem in cooling the coil, the first primary coil 100 and the second primary coil 150 The coil 150 and the coil 150 may not be separately wound, but may be a single continuous coil.

In the transformer for feeding a high-frequency heating coil according to the embodiment of the present invention, the core 300 is usually provided.
At a position where the primary coil 100 straddles the secondary coil 200 and the second primary coil 150,
00 and the first primary coil 100
However, the direction across the secondary coil 200 and the second primary coil 150 is unified to either the upper side or the lower side of the secondary coil 200 or the second primary coil 150. At the position where the secondary coil 200 and the second primary coil 150 intersect, the second primary coil 150 is flattened. Thereby, compared to the conventional high frequency heating coil power supply transformer,
The high-frequency heating coil power supply transformer of the present invention can reduce the overall thickness.

The direction in which the first primary coil 100 straddles the secondary coil 200 or the second primary coil 150 is set to the upper side or the lower side of the secondary coil 200 or the second primary coil 150. The unifying means may be such that the first primary coil 100 is wound in the following manner, for example.
After winding the outer side of the upper side as the first winding,
Wrap around the bottom of the winding. The third winding is wound inside the second winding, and then the fourth winding is wound inside the third winding. The fifth winding is wound on the upper side of the fourth winding, and the sixth winding is wound outside the fifth winding and inside the first winding.

In the transformer for feeding a high-frequency heating coil according to the embodiment of the present invention, the first primary coil 100 and the second primary coil 150 have a two-stage structure as described above. It may be other than that.

Further, in the high frequency heating coil power supply transformer according to the embodiment of the present invention, as shown in FIGS. 7 and 8, the first primary coil 100 and the second primary coil 150 are connected to each other. The secondary coil 20 is not disposed separately on the inner side and the outer side of the secondary coil 200.
0 may be arranged in accordance with the inner surface side or the outer surface side. FIG. 7 is a schematic sectional view showing a coil portion and a core of another high-frequency heating coil power supply transformer according to the embodiment of the present invention, and FIG. 8 is still another high-frequency heating according to the embodiment of the present invention. It is a schematic sectional drawing which shows the coil part and the core of the transformer for coil feeding. Thus, the first primary coil 1
Even if the second primary coil 150, the second primary coil 150, and the secondary coil 200 are arranged, the high-frequency heating coil power supply transformer of the present invention can have a smaller overall thickness than the conventional high-frequency heating coil power supply transformer. It is clear that the detailed description is omitted.

[0058]

As described above, the high-frequency heating coil power supply transformer according to the present invention is a disk-type transformer for supplying power to the high-frequency heating coil, and has a rectangular tubular conductive shape having an internal cooling water passage. A first primary coil, a second primary coil, and a secondary coil having a ring disk shape formed by the body being curved on the same plane are provided, and the secondary coil is provided on an outer surface side of the first primary coil. And the second primary coil is disposed on the outer surface side of the secondary coil.

Therefore, in the case of the transformer for feeding a high-frequency heating coil according to the present invention, the primary coil, which is one of the main factors for increasing the thickness of the transformer for feeding a high-frequency heating coil, is connected to the front side (upper part) of the secondary coil. Side) and back side (lower side)
Instead, the overall thickness is reduced by arranging it on the side surface of the secondary coil.

The high frequency heating coil power supply transformer according to the present invention has a coil portion having the first primary coil, the second primary coil, and the secondary coil, and substantially covers the outer periphery of the coil portion. , The secondary coil is disposed on the outer surface side of the first primary coil, the second primary coil is disposed on the outer surface side of the secondary coil, It is assumed that the end of the portion is extended from a portion where the core is not provided.

That is, in the case of the transformer for supplying power to a high-frequency heating coil according to the present invention, the thickness of the core disposed so as to substantially cover the outer periphery of the coil portion is dimensionally increased above and below the coil portion such as a secondary coil. First, by forcibly joining
The end side of the first primary coil is taken out from the portion where the core is not provided to the side of the high frequency heating coil power supply transformer across the secondary coil and the second primary coil.

Similarly, the end portion of the secondary coil is also taken out from the portion where the core is not disposed to the side of the high frequency heating coil power supply transformer via the portion where the second primary coil is disposed. The second primary coil is also taken out of the portion where the core is not provided to the side of the high frequency heating coil power supply transformer.

Therefore, in the case of the transformer for feeding a high-frequency heating coil according to the present invention, the end of the first primary coil is connected to the secondary coil and the second primary coil from the portion where the core is not provided. The dimension that protrudes in the thickness direction necessary to be taken out to the side of the high-frequency heating coil power supply transformer while straddling, and the end of the secondary coil via the portion where the second primary coil is disposed By setting the dimension protruding in the thickness direction necessary to be taken out to the side surface of the high-frequency heating coil power supply transformer within the thickness of the core above and below the coil portion, for example, the entire high-frequency heating coil power supply transformer The thickness can be prevented from being hindered.

Therefore, in the case of the high frequency heating coil power supply transformer according to the present invention, the thickness of the high frequency heating coil power supply transformer can be reduced. Therefore, it is possible to provide a high-frequency heating coil power supply transformer that can cope with a reduction in the size of a work such as a crankshaft. In addition, since a number of thinned high-frequency heating coil power supply transformers can be arranged side by side, the number of places to be hardened at the same time can be increased, and in some cases, the number of production processes (stations) can be reduced. As a result, the production capacity can be increased and the production cost can be reduced.

In the high frequency heating coil power supply transformer according to the present invention, the first primary coil and the second primary coil are arranged separately on the inner side and the outer side of the secondary coil. Instead, they may be arranged in accordance with the inner surface side or outer surface side of the secondary coil, and the effect at that time is the same as described above.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a coil portion and a core of a high frequency heating coil power supply transformer according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view taken along line AA of FIG.

FIG. 3 is a schematic cross-sectional view illustrating a high-frequency heating coil power supply transformer according to the embodiment of the present invention.

FIG. 4 is a schematic sectional view taken along line BB of FIG. 3;

FIG. 5 is a schematic sectional view taken along line CC of FIG. 3;

FIG. 6 is a schematic sectional view showing a coil section taken along line DD of FIG. 3;

FIG. 7 is a schematic sectional view showing a coil part and a core of another high frequency heating coil power supply transformer according to the embodiment of the present invention.

FIG. 8 is a schematic sectional view showing a coil portion and a core of still another high frequency heating coil power supply transformer according to the embodiment of the present invention.

FIG. 9 is a schematic explanatory diagram for explaining the positioning of a high-frequency heating coil power supply transformer in the high-frequency hardening device.

FIG. 10 is a schematic sectional view showing a coil part and a core in a conventional high frequency heating coil power supply transformer.

[Explanation of symbols]

 100 first primary coil 150 second primary coil 200 secondary coil 300 core

Claims (3)

[Claims] 1. A disk-shaped transformer for supplying power to a high-frequency heating coil, wherein a ring-shaped disk-shaped transformer formed by curving a rectangular tubular conductor having a cooling water passage inside on the same plane. A first primary coil, a second primary coil, and a secondary coil, wherein the secondary coil is disposed on the outer side of the first primary coil, and the second primary coil is disposed on the outer side of the secondary coil. A transformer for feeding a high-frequency heating coil, characterized in that: 2. A secondary battery comprising: a coil unit having the first primary coil, the second primary coil, and a secondary coil; and a core disposed to substantially cover an outer periphery of the coil unit. The coil is disposed on the outer surface side of the first primary coil, the second primary coil is disposed on the outer surface side of the secondary coil, and the end of the coil portion is pulled out from a portion where the core is not provided. The high frequency heating coil power supply transformer according to claim 1, wherein: 3. The high frequency heating coil power supply transformer according to claim 1, wherein the first primary coil and the second primary coil are divided into an inner surface side and an outer surface side of a secondary coil. A transformer for feeding a high-frequency heating coil, wherein the transformer is not arranged but arranged in accordance with the inner side or the outer side of the secondary coil.