JP2002129230A - Matched transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily change connection between a common tap and an individual tap. SOLUTION: The matched transformer interposed between an electric source (not shown in figure) and a high frequency heating coil (not shown in figure), supplied with power by the electric source, is provided with three pieces of common taps 100A, 100B, 100C, six pieces of individual taps 200AL, 200AR, 200BL, 200BR, 200CL, 200CR arranged for each output voltage and a connecting bus bar 300 as a connecting means connecting the common taps 100A-100C and the individual taps 200AL-200CR. The above individual taps 200AL, 200AR, 200BL, 200BR, 200CL, 200CR are parallel lined at a prescribed interval at both side parts of the common taps 100A, 100B, 100C, and the above individual taps 200AL, 200AR, 200BL, 200BR, 200CL, 200CR and the common taps 100A, 100B, 100C, are made of the metallic plate almost crank-shaped upward and having electric conductivity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a matching transformer used in an induction hardening device.

[0002]

2. Description of the Related Art An induction hardening apparatus is a matching device for matching the impedance of power supplied from a power source between a power supply for supplying a high-frequency current and a high-frequency heating coil for heating a workpiece to be subjected to the induction hardening. A transformer is provided. As shown in FIG. 5, this matching transformer has one common tap 600 and a plurality of individual taps 70 on the primary side so that the voltage applied to the high-frequency heating coil can be changed.
0AL, 700AR, 700BL, 700BR, 700
CL, 700CR, and both taps, 60
0, 700AL, 700AR, 700BL, 700B
R, 700CL, and 700CR are connected by a connection busbar 800 as connection means.

A plurality of (three in the drawing) bolts 600A, 600B, 60
0C is provided, and individual taps 700AL, 700A each consisting of six bolts, three on each of the left and right sides, are provided.
R, 700BL, 700BR, 700CL, 700CR
Is provided. Also, the connection busbar 800
Copper plate, bolts 600A, 60 of common tap 600
0B, 600C and individual taps 700AL, 700A
R, 700BL, 700BR, 700CL, 700CR
A pair of openings into which the bolts are inserted are opened. That is, the common tap 6 is formed in the opening of the connection bus bar 800.
00 bolts 600A, 600B, 600C and individual taps 700AL, 700AR, 700BL, 700B
R, 700CL, and 700CR are inserted and tightened with nuts 810.
00 bolts 600A, 600B, 600C and individual taps 700AL, 700AR, 700BL, 700B
R, 700CL, and 700CR are electrically connected.

[0004]

However, the high-frequency heating coil is changed according to the workpiece to be subjected to induction hardening. At the same time, the common tap 600 and the individual taps 700AL, 7 correspond to the high-frequency heating coil voltage.
00AR, 700BL, 700BR, 700CL, 70
The connection with 0CR must be changed. The common tap 600 and the individual taps 700AL, 700AR, 70
To change the connection between OBL, 700BR, 700CL, and 700CR, the two nuts 810 are removed, and the connection busbar 800, which is the connection means, is connected to the common tap 600 and the individual taps 700AL, 700AR, 700BL, 70, respectively.
After fitting into OBR, 700CL, and 700CR, a three-stage operation of tightening two nuts 810 again is required. This operation is troublesome especially in the case of high-mix low-volume production.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a matching transformer that facilitates changing the connection between a common tap and an individual tap.

[0006]

SUMMARY OF THE INVENTION A matching transformer according to the present invention is a matching transformer interposed between a power supply and a high-frequency heating coil supplied with power from the power supply. An individual tap provided for each value and connection means for connecting both taps are provided, and the individual taps are arranged in parallel with a predetermined interval on both sides of a common tap, and the individual taps and The common tap is
It is a conductive metal plate formed in an upward substantially crank shape.

[0007]

FIG. 1 is a schematic perspective view of a main part of a matching transformer according to an embodiment of the present invention, and FIG. 2 is a schematic side view of a main part of the matching transformer according to the embodiment of the present invention. FIG. 3 is a drawing of the connecting means of the matching transformer according to the embodiment of the present invention, and FIG.
FIG. 4B is a schematic side view, and FIG. 4 shows a matching transformer according to the embodiment of the present invention in which a second common tap and a left individual tap adjacent thereto are connected by a connection bus bar. It is a schematic perspective view.

A matching transformer according to an embodiment of the present invention is a matching transformer interposed between a power supply (not shown) and a high-frequency heating coil (not shown) supplied with power from the power supply. Tap 100A, 100
B, 100C, and six individual taps 200AL, 200AR, 200BL, 200 provided for each output voltage value.
BR, 200CL, 200CR and both taps 100A ~
100C, a connection busbar 300 as connection means for connecting the 200AL to 200CR, and the individual taps 200AL, 200AR, 200BL, 200B
R, 200CL, 200CR are common tap 100A,
The individual taps 200AL, 200AR, are arranged in parallel at predetermined intervals on both sides of 100B, 100C.
The 200BL, 200BR, 200CL, 200CR and the common taps 100A, 100B, 100C are upwardly conductive metal plates formed in a substantially crank shape.

The common tap 100A is formed by bending a metal plate made of copper into a crank shape, and has a connection portion 120A facing upward from one end of a horizontal stepped portion 110A and a downward connection from the other end. The part 130A extends in parallel. The connection portion 120A is a portion to which the connection bus bar 300 is connected, and the attachment portion 130A is a portion to be attached to a side surface of the matching transformer.

The other two common taps 100B, 100C
Are formed in the same manner, but as will be described later, the steps provided on the lower side have longer step portions 110B and 110C.

The common taps 100A, 100B, 1
00C has a plurality of stages (3 in the drawing) on the side of the matching transformer.
) Are provided in a straight line. The lower the three common taps 100A, 100B, and 100C are, the lower the stepped portions 110A, 110B, and 110C are.
Is set to be longer. Therefore, among the three-stage common taps 100A, 100B, and 100C, the common taps 100B and 100C located at the middle and lower stages have the connection portions 120B and 120C protruding outward from the common taps 100A and 100B located above the common taps 100A and 100B. It is supposed to.

On the other hand, the individual tap 200AL is formed by bending a copper metal plate into a crank shape.
An upward connecting portion 220AL extends from one end of the 10AL and a downward mounting portion 230AL extends from the other end in parallel. The connection portion 220AL is a portion to which the connection bus bar 300 is connected, and the attachment portion 230AL is a portion to be attached to a side surface of the matching transformer.

The six individual taps 200AL, 20
0AR, 200BL, 200BR, 200CL, 200
CR is the common tap 100A, 100B, 100C
There are a total of six on each of the left and right sides. These individual taps 200AL, 200AR, 200BL, 20
0BR, 200CL, 200CR, individual tap 200A provided on the right side of first-stage common tap 100A
R is 375V, the individual tap 200AL provided on the left side of the first stage common tap 100A is 300V, and the individual tap 200B provided on the right side of the second stage common tap 100B.
R is 250V, the individual tap 200BL provided on the left side of the second common tap 100B is 214V, and the individual tap 200BL provided on the right side of the third common tap 100C is 200V.
The CR has an output voltage value of 187V, and an individual tap 200CL166V provided on the left side of the third-stage common tap 100C.

Each of the individual taps 200AL to 200CR
The stoppers 221AL, 221AR, 221BL, as positioning means,
221BR, 221CL and 221CR are provided, respectively. For example, the stopper 221AL is
0AL is provided on the side surface farther from the adjacent common tap 100A among the both side surfaces. Such stopper 22
1AL is a plate member made of a copper plate larger than the thickness dimension of the connection portion 220AL, and is set to be larger than the width dimension of a groove 310 of the connection bus bar 300 described later. Therefore, the groove 310 of the connection bus bar 300 is connected to the connection portion 220A.
When fitted in L, the end of the connection bus bar 300 comes into contact with the stopper 221AL, so that the connection bus bar 300 is no longer located outside.

The other five individual taps 200AR,
Similar stoppers 221AR, 221BL, 221BR, 200BL, 200BR, 200CL, 200CR
221CL and 221CR are provided.

The common taps 100A to 100C and the individual taps 200AL to 200CR are bolted to terminals provided on side surfaces of the matching transformer. Also, the common taps 100B, 100C of the second and third stages
And individual taps 200BL, 200BR, 200CL,
The 200CR is particularly suitable for the steps 110B, 110C, 210B.
Since L, 210BR, 210CL, and 210CR are large, as shown in FIG. 2, they are supported by a reinforcing stay 400 from below to prevent the connecting busbar 300 from being deformed downward due to attachment.

In addition, in each of the common taps 100A to 100C and the individual taps 200AL to 200CR, a cooling liquid (hereinafter, including cooling water) is circulated on the lower surface side of each of the steps 110A to 110C and 210AL to 210CR. A cooling pipe 500 as a means is attached. By flowing the cooling liquid through the cooling pipe 500, heat generation of each of the common taps 100A to 100C and the individual taps 200AL to 200CR is suppressed.

On the other hand, the connection bus bar 300 as the connection means is made of a block material made of copper and has a groove 310 opened toward the lower surface side as shown in FIG. It is formed in a downward substantially concave shape. A tongue-shaped wall 311 is provided at the center of the groove 310.

This groove 310 is formed in each common tap 100A.
To 100C and connection parts 210AL to 210C for individual taps 200AL to 200CR
It is formed slightly narrower than the thickness dimension of R. A contact 312 protruding inward is provided inside the groove 310. This contact 312
Are slightly recessed when pressed outward.

Further, the length of the connection bus bar 300 is, for example, such that the width of each of the common taps 100A to 100C and the individual taps 200AL to 200CR is 60 mm, and the individual taps 200AL to 200C which are respectively connected to the centers of the common taps 100A to 100C. The distance from the center of 200CR is 70
In the case of mm, it is set to 130 mm. That is,
When, for example, the common tap 100A and the adjacent individual tap 200AL are connected by the connection bus bar 300, the individual tap 200AR on the unconnected side is ensured while ensuring reliable electrical connection between the two taps 100A and 200AL.
Is set so that it never touches.

The connection bus bar 300 is provided with a substantially U-shaped handle 320 made of a synthetic resin, ceramics or the like having insulation and heat resistance at the front. The handle 320 is a part that the operator grips by hand when attaching and detaching the connection bus bar 300.

The procedure for using the matching transformer configured as described above will be described. First, the output voltage on the secondary side is set to 2
When it is desired to set the voltage to 50 V, as shown in FIG.
Individual tap 200BR at the second stage and common tap 10 at the second stage
0B is connected with the connection bus bar 300. This connection
This is performed by fitting the connection bus bar 300 from above so as to straddle the second individual tap 200BR on the right side and the common tap 100B on the second stage.

Since the contact 312 is provided in the groove 310 of the connection bus bar 300, when the connection bus bar 300 is inserted, a reliable electrical connection between the common tap 100B and the individual tap 200BR is ensured.

In this state, it is desirable to slide the connection bus bar 300 to the leftmost side. This is because the sliding of the connection bus bar 300 causes the connection bus bar 30 to slide.
This is because the end of “0” abuts against the stopper 221BR, which is a positioning means, so that the electrical connection between the two taps 100B and 200BR is more reliably performed.

When performing induction hardening on different works, the connection bus bar 300 connecting the common tap 100A and the individual tap 200AL is removed, and the output voltage value corresponding to the work to be subjected to induction hardening is removed. Is connected to the common tap adjacent thereto by the connection bus bar 300.

In the above description, as the cooling means, the cooling pipe 500 through which the cooling liquid is circulated is connected to each step 11
0A to 110C and 210AL to 210CR are provided on the lower surface side.
210CR itself may be formed thick, and a cooling pipe through which the coolant flows may be inserted therein, or a hole through which the coolant flows may be provided therein.

[0027]

The matching transformer according to the present invention comprises a power supply,
A matching transformer interposed between the high-frequency heating coil to which power is supplied from the power supply, a common tap, individual taps provided for each output voltage value, and connection means for fitting and connecting to both taps; Wherein the individual taps are arranged in parallel at predetermined intervals on both sides of the common tap, and the individual taps and the common tap are formed of upwardly conductive metal having a substantially crank shape. It is a board.

For this reason, with this matching transformer, only the connection means is fitted into the common tap and the individual tap,
The connection between the common tap and the individual tap can be easily changed.

Preferably, the connection means connects the individual tap and the common tap by being inserted from above both taps from the viewpoint of easy connection.

Further, of both side surfaces of the individual tap,
When the positioning means on the side farther from the common tap is provided with which the inserted connection means abuts, the connection means abuts on the positioning means, thereby connecting to the farthest position from another adjacent individual tap. Since the means is located, it is desirable from the viewpoint of safety.

Further, the common tap and the individual tap include:
When provided over a plurality of stages, it is possible to cope with many output voltage values.

Further, if the common tap and the individual tap are provided with a cooling means, it is possible to supply more current.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a main part of a matching transformer according to an embodiment of the present invention.

FIG. 2 is a schematic side view of a main part of the matching transformer according to the embodiment of the present invention.

3A and 3B are drawings of connecting means of the matching transformer according to the embodiment of the present invention, wherein FIG. 3A is a schematic partially broken front view, and FIG. 3B is a schematic side view.

FIG. 4 is a schematic perspective view showing a state in which a second common tap and a left individual tap adjacent thereto are connected by a connection busbar in the matching transformer according to the embodiment of the present invention;

FIG. 5 is a schematic front view of a conventional matching transformer of this type.

[Description of Signs] 100A to 100C Common tap 200AL to 200CR Individual tap 300 Connection busbar (connection means)

Claims (5)

[Claims] In a matching transformer interposed between a power supply and a high-frequency heating coil supplied with power from the power supply, a common tap, individual taps provided for each output voltage value, and both taps are fitted. The individual taps are arranged in parallel at predetermined intervals on both sides of the common tap, and the individual taps and the common tap are formed in a substantially upward crank shape. A matching transformer, characterized in that the matching transformer is a metal plate having improved conductivity. 2. The matching transformer according to claim 1, wherein said connection means connects the individual tap and the common tap by being inserted from above both taps. 3. The positioning device according to claim 1, wherein a side surface of the side surface of the individual tap far from the common tap is provided with a positioning unit to which the inserted connection unit comes into contact. Matching transformer. 4. The matching transformer according to claim 1, wherein the common tap and the individual tap are provided in a plurality of stages. 5. The cooling device according to claim 1, wherein the common tap and the individual tap are provided with a cooling unit.
5. The matching transformer according to 2, 3, or 4.