JPH075292U - High frequency induction heating device transformer - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a transformer for a high-frequency induction heating device, which can reduce the size of the copper plate, suppress heat generation of the copper plate, and form the transformer itself in a small size. [Configuration] An output transformer, which is formed separately from an oscillator in which an inverter circuit is housed and whose primary side is connected to the output side of the inverter circuit, and a resonance capacitor on the secondary side of the output transformer. A heating coil to be connected, the capacitor is formed of a plurality of high-frequency film capacitors, the capacitors are mounted in two rows on both sides in the longitudinal direction of a pair of copper plates, and cooling pipes are provided on the opposite surfaces of the copper plates. Braze and fix.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transformer of a high-frequency induction heating device that heats a work by a high-frequency induction current, for example.

[0002]

[Prior art]

 Conventionally, a high-frequency induction heating device has a transformer having a built-in output transformer connected to the output side of an oscillator and a capacitor for resonance, and a heating coil is integrally arranged in this transformer. . The capacitors of this transformer are generally fixed in a row between a pair of copper plates.

[0003]

[Problems to be solved by the device]

 However, in the above transformer, when the capacitance of the resonance capacitor is large, the number of capacitors connected in parallel increases and the length of the copper plate becomes long, and the copper plate easily heats up due to the current flowing through the copper plate. However, there was a problem that the transformer itself became large, such as the need to increase the internal space. In particular, in the case of a transformer in which induction heating of a work is performed with a large current of high frequency, the above problems are more pronounced, and it is the actual situation that miniaturization is desired.

The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to reduce the size of a copper plate, suppress heat generation of the copper plate, and form the transformer itself in a small size. , To provide a transformer for a high frequency induction heating device.

[0005]

[Means for Solving the Problems]

 In order to achieve such an object, the transformer of the present invention is formed separately from the oscillator in which the inverter circuit is housed, the output side of which the primary side is connected to the output side of the inverter circuit, and the transformer. And a heating coil connected to the secondary side of the capacitor via a resonance capacitor, the capacitor is formed of a plurality of high-frequency film capacitors, and the capacitors are provided on both sides of a pair of copper plates in the longitudinal direction. It is characterized in that it is mounted in rows and a cooling pipe is brazed and fixed to the opposing surface side of the copper plate.

[0006]

[Action]

 According to the transformer of the present invention, a plurality of film capacitors for resonance are mounted in two rows on both sides of the pair of copper plates in the longitudinal direction, and the length of the copper plates is shorter than in the conventional case. In addition, the heat generated by the current flowing through the copper plate is suppressed by the cooling water that flows in the pipe brazed and fixed to the copper plate, and the internal space of the transformer can be narrowed. As a result, the transformer itself can be miniaturized.

[0007]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings. 1 and 2 show a front view and a side view of a high frequency induction heating apparatus according to the present invention. In the figure, a high-frequency induction heating device 1 is placed on a pedestal 2, and for example, an oscillator 4 having a built-in transistor inverter circuit 3, a transformer 5 connected to this oscillator 4, and a transformer 2 are arranged in the pedestal 2. And a supporting table 7 for supporting the work.

As shown in FIG. 3, the transformer 5 has an output transformer 9 and a capacitor unit 10 arranged in the case 8, a heating coil 11 arranged in the front side of the case 8, and the like. There is. The output transformer 9 is provided with a primary winding 13 composed of a lead wire or the like wound around the middle leg of the E-shaped core 12 a predetermined number of times, and is arranged outside the primary winding 13, and a copper plate is wound into a cylindrical shape. It is formed by the turned secondary winding 14. A cooling pipe 15 made of a copper pipe is brazed and fixed to the outer peripheral surface of the secondary winding 14, and hose connectors 16 and 17 are fixed to both ends of the pipe 15.

The capacitor unit 10 has, for example, 16 high-frequency film capacitors 18. Both terminals of the capacitor 18 are fixed by screws 21 as shown in FIG. 4 to the outside of mounting holes (not shown) formed at both ends of the pair of copper plates 19 and 20 in the longitudinal direction. As a result, eighteen 16 capacitors 18 are arranged in two rows, upper and lower. The copper plate 19 is formed in a linear shape, and one end thereof is connected to an L-shaped copper plate 23 fixed to an insulating plate 22 on the front surface of the case 8. The copper plate 20 is formed in a U shape, and the other end thereof is connected to one end of the secondary winding 14 of the output transformer 9 via the L-shaped copper plate 24. Cooling pipes 25 and 26 made of copper pipe are brazed and fixed to the opposing surfaces of the copper plates 19 and 20, and hose connectors 27 to 30 are fixed to both ends thereof.

The heating coil 11 has a pair of L-shaped copper plates 32 and 33 pressed and fixed via an insulating plate 31, and the tip ends of pipes 34 and 35 fixed to the copper plates 32 and 33. A coil 36 formed by bending a copper pipe into a predetermined shape is fixed. Hose connectors 37 and 38 are fixed to the other ends of the pipes 34 and 35. The copper plate 33 is connected to the copper plate 23, and the copper plate 32 is connected to the other end of the secondary winding 14 of the output transformer 9 via the L-shaped copper plate 39 and the copper plates 40 and 41 fixed to the insulating plate 22. It is connected to the. An insulating plate 55 is arranged between the copper plates 24 and 41.

The cooling water is circulated and supplied through the hose connectors 42 to 45 arranged in the case 8 as shown by the chain double-dashed line. Further, both ends of the primary winding 13 of the output transformer 9 are connected to a socket 46 provided in the case 8 as shown by a three-dot chain line, and the socket 46 and the socket (not shown) of the oscillator 4 are connected to each other at a predetermined position. Connected with a cable.

The oscillator 4 has the inverter circuit 3 described above, and a front panel 4a thereof has a voltmeter 47 and an ammeter 48 for supporting output voltage and current and an output for setting an output, as shown in FIG. A setter 49, an indicator light 50 for displaying an abnormality, a breaker 51, and two timers 52, 53 for controlling the heating state in two stages are provided. Further, cooling water is stored in the cooling liquid tank 6, and this cooling water is pumped up by a pump (not shown) which operates according to a control signal from the oscillator 4 and supplied into the oscillator 4 and the transformer 5. The support base 7 has a table 54 movable in the front-rear direction and the left-right direction, and a work (not shown) to be induction-heated is set on the table 54.

As described above, according to the above-described embodiment, the resonance capacitors 18 arranged in the transformer 5 formed separately from the oscillator 4 are connected to the pair of copper plates 19 and 20 in the upper and lower two rows. Since it is attached to the capacitor, the length of the capacitor mounting portion of the copper plates 19 and 20 can be shortened. Further, since the cooling pipes 25 and 26 are fixed to the facing surfaces of the copper plates 19 and 20, heat generation of the copper plates 19 and 20 can be suppressed, and the space inside the case 8 can be narrowed. As a result, the case 8, that is, the transformer 5 itself can be formed in a small size, and the position adjustment with the work becomes easy. Furthermore, since a high-frequency film capacitor is used as the capacitor 18, the high-frequency characteristics are excellent, and a large current can flow with low loss, and a good resonance state can be obtained.

Note that the connection structure of each copper plate in the above embodiment is an example, and the copper plates 19, 23, the copper plates 20, 24, the copper plates 39, 40, 41, etc. may be composed of one copper plate, The configurations of the output transformer 9 and the heating coil 11 in the above embodiment are also examples, and needless to say, various modifications can be made without departing from the scope of the present invention.

[0015]

[Effect of device]

 As described above in detail, according to the transformer of the high-frequency induction heating device of the present invention, the size of the copper plate can be reduced, the heat generation of the copper plate can be suppressed, and the transformer itself can be formed in a small size. It is possible to easily adjust the positions of the heating coil arranged in the transformer and the work.

[Brief description of drawings]

FIG. 1 is a front view of a high frequency induction heating device according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view of the transformer.

FIG. 4 is a side view of the same capacitor unit.

[Explanation of symbols]

 1 High Frequency Induction Heating Device 3 Inverter Circuit 4 Oscillator 5 Transformer 8 Case 9 Output Transformer 10 Capacitor Unit 11 Heating Coil 18 Capacitor 19, 20 Copper Plate 25, 26 Pipe

Claims (1)

[Scope of utility model registration request] 1. An output transformer formed separately from an oscillator in which an inverter circuit is housed, the primary side of which is connected to the output side of the inverter circuit, and a resonance capacitor on the secondary side of the output transformer. And a heating coil connected through the capacitor, the capacitor is formed of a plurality of high-frequency film capacitors, the capacitors are mounted in two rows on both sides in the longitudinal direction of a pair of copper plates, and the opposite faces of the copper plates are cooled. A transformer for a high-frequency induction heating device, characterized in that a pipe for use is fixed by brazing.