JP2000164331A - Induction coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable forced cooling and movement of the only coil part by providing a rubber tube for forming a water flow space over the whole peripheral surface of a conductive linear member having flexibility and connected to a conductive metal pipe at one end thereof and electrically connected to a power source at the other end thereof and for surrounding the power supply part main body over the whole length thereof and connected to the conductive metal pipe at one end thereof. SOLUTION: An induction coil has a coil part 2 formed by winding a copper pipe into a coil and a power supply part formed of a power supply part main body and a rubber tube 6. A bare pressure terminal 42 of the power supply part main body 4 binds three copper solid wires 41 at both ends thereof. The rubber tube 6 surrounds the whole length of the power supply part main body 4, and forms a water supply space over the whole circumference of each copper solid wire 41. Cooling water is supplied from one terminal main body, and drained from the other terminal main body so as to always forcedly cool the induction coil. Heat generation at the coil part 2 is restricted so as to enable the use for a long time. Position of the coil part 2 is adjusted by bending the power supply part having flexibility.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an induction coil used in a high-frequency induction heating device.

[0002]

2. Description of the Related Art An induction coil as disclosed in JP-A-4-294091 is used in a high-frequency induction heating device for heating a conductor using electromagnetic induction.
Generally, in industrial applications (not for consumer use such as IH rice cookers), a large high-frequency current of several tens to several hundreds of amps must be passed through this induction coil, and the induction coil itself generates heat for a long time. There is a problem that use is impossible.

Therefore, in general, in order to prevent heat generation of the induction coil itself, the induction coil is formed of a copper tube, cooling water is flowed in the copper tube, and a high-frequency current is supplied to the copper tube while cooling the copper tube. It is considered that the flow is caused to flow for induction heating. However, when a copper tube is used, the flexibility is poor. For example, when heating a metal embedded in a wall, or when arbitrarily selecting an object to be heated at a high place, the position of the induction coil is reduced. However, even when fine adjustment is required, the apparatus body, which is a heavy object equipped with a high-frequency power supply, must be moved together with the induction coil. Therefore, workability becomes very poor.

[0004]

SUMMARY OF THE INVENTION In view of such circumstances, the present invention is intended to provide a coil which can be forcibly cooled, can be used continuously for a long period of time, and can be connected to a power supply. It is an object of the present invention to provide an induction coil capable of moving only a part.

[0005]

According to the present invention, there is provided an induction coil comprising: a coil section;
In an induction coil having a coil unit interposed between a power supply and a power supply unit for electrically connecting the coil unit and the power supply, the coil unit is formed by a conductive metal pipe through which water can pass, and The part comprises at least one conductive linear member or conductive band member having one end electrically connected to the conductive metal pipe and the other end electrically connected to a power supply. A flexible power supply unit main body and a conductive linear member or a conductive strip-shaped member that surrounds the power supply unit main body over the entire length in a state where a water passage space is formed on the entire peripheral surface, and one end is electrically conductive. And a rubber tube connected to the conductive metal pipe.

In the present invention, the material of the conductive metal pipe is not particularly limited, and includes, for example, copper, aluminum, silver and the like. Copper is preferable in view of electric resistance and cost. The diameter of the pipe and the number of turns of the coil can be appropriately selected according to the use of the induction coil.

The material of the conductive linear member or the conductive band member is not particularly limited, and examples thereof include copper, aluminum, and silver. Copper is preferable in view of electric resistance and cost. The rubber tube is not particularly limited as long as it has flexibility, for example,
Examples include silicone rubber, chloroprene rubber (CR), and butadiene-acrylonitrile rubber (NBR).

[0008] The water passing space means a space in which the conductive linear member or the conductive band member is always exposed to the cooling water passed through the rubber tube over the entire peripheral surface.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the induction coil according to the present invention.

As shown in FIG. 1, this induction coil 1
A coil unit 2 and power supply units 3 and 3 are provided. The coil part 2 is formed by winding a copper pipe as a conductive metal pipe in a coil shape.

Each power supply unit 3 includes a power supply unit main body 4 and a rubber tube 6 as shown in FIG. The power supply unit main body 4 includes three copper single wires 41, 41, 41 having flexibility that can be easily bent by hand, and three copper single wires 41, 41, 41, 41.
2 and 4, are formed from bare crimp terminals 42, 42 bound at both ends thereof.

The rubber tube 6 surrounds the power supply section main body 4 over its entire length, and as shown in FIG.
1, 41, 41 has an inner diameter where a water passage space is formed over the entire circumference. The coil section 2 and the power supply section 3 are connected via a joint 5 as shown in FIG.

That is, the joint 5 is made of copper or brass, has a feeder fixing portion 51 at one end, and a coil fixing portion 52 at the other end. The power supply unit fixing portion 51 has a rubber tube fixing portion 54 to which the rubber tube 6 formed in a nozzle shape having the same inner diameter as the inner diameter of the copper pipe forming the coil portion 2 is externally fitted, and is fixed by the clamp 53.
And a crimp terminal fixing portion 55 extending from the tip of the rubber tube fixing portion 54 and fixing the bare crimp terminal 42 with a screw.

The coil portion fixing portion 52 has a male screw portion 57a on the outer peripheral surface, a fixing portion main body 57 having the same inner diameter as the inner diameter of the copper pipe forming the coil portion 2, and an abacus ball-shaped packing 58 inside. A cap nut 59 is provided, and the cap nut 59 is screwed into the male screw portion 57a of the fixing portion main body 57 in a state where the end face of the fixing portion main body 57 and the end face of the coil portion 2 abut against each other, thereby being fixed to the coil portion 2. Have been.

The induction coil 1 is configured as described above. As shown in FIGS. 4 and 5, the open ends (ends opposite to the coil section 2) of the power supply sections 3 and 3 are connected to the main body 7 of the apparatus. Is connected to a high-frequency power supply 8 provided in the apparatus to form a high-frequency induction heating device. That is, the high frequency power supply 8
Has a terminal portion 9 made of copper or brass, as shown in FIGS.

The terminal portion 9 has a nozzle-shaped terminal body 91 having a flow path 91a through which cooling water can be supplied and drained from the side, and the other bare crimp terminal 42 of the power supply section main body 4 at the end of the terminal body 91. Are provided with a crimp terminal fixing portion 92 to which screws are fixed. In the induction coil 1, the open ends of both the power supply parts 3 and 3 fix the bare crimp terminal 42 to the crimp terminal fixing part 92 with screws, and the rubber tube 6 is fitted around the terminal body 91, and the fastening fitting 93 is used. To be fixed to the apparatus main body 7.

Therefore, the induction coil 1 can be configured such that tap water is supplied as cooling water from the terminal body 91 of one terminal portion 9 and drained from the terminal body 91 of the other terminal portion 9. Since it is always in a state of being forcibly cooled by the cooling water, heat generation of the coil portion 2 itself is suppressed, and long-time use is possible.

Further, since the power supply unit 3 has flexibility, the power supply unit 3 is bent so that the height position and the width direction position of the coil unit 2 can be adjusted without moving the apparatus body 7 itself. Can be adjusted. That is, for example, even when heating a metal embedded in a wall or when it is desired to select an object to be heated arbitrarily at a high place, the position of the coil portion 2 can be easily adjusted, and the work can be performed accurately and accurately. Speeding up can be achieved. In FIG. 5, reference numeral 71 denotes a control unit of the apparatus main body 7.

The induction coil according to the present invention is not limited to the above embodiment. For example, in the above embodiment, three copper single wires were used. However, two or more copper single wires may be used, or four or more copper single wires may be used as long as a water flow space is always generated around each copper single wire.

In the above-described embodiment, the rubber tube 6 and the bare crimp terminal 42 are connected to the terminal 9 of the high-frequency power source 8, but the end of the rubber tube 6 is cooled from the side in advance. A copper or brass base having a flow path through which water can be supplied and drained may be integrally fixed, a bare crimp terminal 42 may be connected to the base, and the base may be connected to a terminal of a high-frequency power supply. Absent. Further, in the above-described embodiment, tap water is used as the cooling water, but the cooling water may be circulated using a cooling device.

[0021]

Embodiments of the present invention will be described below in more detail.

(Embodiment 1) The dimensions of each part shown in FIG.
= Φ40mm, L1 = 100mm, total length L2 = 10 of the feeding part
Rubber tube (inner diameter 11 mm, outer diameter 14 mm), copper tube (inner diameter 4 mm, outer diameter 6 mm) Copper single wire = 3
After producing a dielectric coil having a copper single wire diameter of φ2 mm, this induction coil was set in the apparatus main body,
When a stainless steel bolt of 20 g was subjected to high frequency induction heating at 440 kHz and an output of 20 A (4 kW), the stainless steel bolt was melted in about 30 seconds. That is, the stainless bolt was heated to 1500 ° C. or higher.

Further, the heat generated in the coil portion can be suppressed by the cooling water, and the coil can be used for a long time. Also,
Since the power supply unit has flexibility, the position of the coil unit could be changed without moving the apparatus main body.

(Comparative Example 1) Instead of three copper single wires, φ
An attempt was made to heat a stainless steel bolt by high-frequency induction heating in the same manner as in Example 1 except that 80 single copper wires of 0.5 mm were passed through the rubber tube. However, the rubber tube of the power supply section began to melt in about 10 seconds. Cooling water could not be supplied to the coil. In other words, when using a large number of thin copper single wires, it becomes difficult for cooling water to enter the gap between the copper single wires and the copper single wires,
It is considered that the rubber tube was burned out due to heat generation in the part that was difficult to contact with water.

[0025]

As described above, the induction coil according to the present invention can be forcibly cooled, can be used continuously for a long time, and can be connected to a power supply. Also, only the coil portion can be moved. Therefore,
When used as an induction coil in a high-frequency induction heating device,
The position of the coil unit can be easily moved without moving the apparatus main body, and workability is improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of an induction coil according to the present invention.

FIG. 2 is an exploded view illustrating a connection structure between a coil unit and a power supply unit of the induction coil of FIG. 1;

FIG. 3 is a sectional view of a power supply unit of the induction coil of FIG. 1;

FIG. 4 is an exploded view illustrating a connection structure between the induction coil of FIG. 1 and a high-frequency power supply.

FIG. 5 is a front view of a high-frequency induction heating device using the induction coil of FIG. 1;

[Description of Signs] 1 Induction coil 2 Coil section 3 Power supply section 4 Power supply section main body 41 Single copper wire (conductive linear member) 6 Rubber tube 8 High frequency power supply

Claims (1)

[Claims] 1. An induction coil having a coil portion and a power supply portion interposed between the coil portion and a power source for electrically connecting the coil portion to the power source, wherein the coil portion has a conductive property allowing water to flow therethrough. It is formed by a metal pipe, and the power supply unit is
A flexible member comprising at least one conductive linear member or conductive band member having one end electrically connected to the conductive metal pipe and the other end electrically connected to a power source. Power supply unit body having the property, while surrounding the power supply unit body over the entire length in a state where a water passage space is formed on the entire peripheral surface of the conductive linear member or conductive band-shaped member,
An induction coil, comprising: a rubber tube having one end connected to a conductive metal pipe.