JP3207633B2 - High frequency cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency cable used for high-frequency heating or the like.

[0002]

2. Description of the Related Art Conventionally, when performing high-frequency induction heating or heating by directly energizing an object to be heated, the distance from a matching transformer to a heating coil or an object to be heated must be minimized to improve the efficiency of high-frequency power transmission. There is. Therefore,
Conventionally, a matching transformer output terminal is directly connected to a heating coil or an object to be heated, or a bus bar or the like is used as a reciprocating line with a thin insulator sandwiched between copper plates. Only when absolutely necessary was a very short cable used.

[0003]

Since there is no particular difference between the high-frequency induction heating and the high-frequency direct current heating in the application of the high-frequency power from the matching transformer to the object to be heated, the high-frequency induction heating will be described below.

A high-frequency induction heating device generally includes a high-frequency power supply, a matching transformer, and a heating coil.
Since the impedance from the power supply to the matching transformer is relatively high, up to several tens of KHz is connected with a normal cable although there is some loss. However, since the impedance between the heating coil and the matching transformer is often lower than that of the matching transformer, a large current flows.If a cable is used, the loss due to heat generation increases. Busbars or very short cables are used.

For this reason, when a heating coil is mounted on an object to be heated, there is a case where a large and heavy matching transformer cannot be mounted due to dimensional restrictions. Further, when the object to be heated is far away, it is impossible to move only the heating coil.

An object of the present invention is to provide a high-frequency cable capable of solving the above problems.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an object of the present invention is to provide a flexible and flexible high-frequency cable with little loss even when the cable is extended.

(1) In the high-frequency cable of the present invention, a flexible thin plate insulator is sandwiched between two braided conductors having terminals at both ends and having a flat braided part, and one of the braided conductors serves as a current outgoing line. In addition to the other braided conductive wire, the braided portion is covered with a flexible insulating hose so that cooling water flows through the hose.

(2) The high-frequency cable of the present invention
A flexible thin-plate insulator is interposed between each of three or more braided conductors having terminals at both ends and having a flat braided portion, and one of the adjacent braided conductors is used as a current outgoing line, and the other braided conductor is used as a conductor. Is a current return line, and the braided part is covered with a flexible hose so that cooling water flows through the hose.

[0010]

According to the present invention, one or the other or an adjacent one or the other braided conductor is sandwiched between two or three or more flat braided conductors having a braided portion with a flexible thin plate insulator interposed therebetween. In addition to the current forward and return lines, these braided wires are covered with a flexible hose, so that a high-frequency cable that is flexible and easy to handle can be provided.

Further, as described above, one or the other, or one or the other of the adjacent braided conductors is sandwiched between the flat braided conductors with a thin plate insulator therebetween as the current forward line and the current return line, respectively. High frequency loss of the line can be reduced.

In addition, since the cooling water flows through the flexible hose, the cable that has been heated by the high-frequency current is effectively cooled.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention relating to a high-frequency cable for connecting between a matching transformer and a heating coil of a high-frequency induction heating apparatus will be described with reference to FIGS. 1,
1 'is a flat copper braided copper wire portion having a rectangular cross section having substantially the same cross-sectional area, and both ends of the braided copper wire portions 1 and 1'
Flat cable terminals 2 and 3 are attached, respectively. The outgoing line and the return line are formed.

Reference numeral 4 denotes a flexible thin sheet insulator made of polytetrafluoroethylene (Teflon) or the like, which is sandwiched between the braided conductors A and A 'to fasten the cable terminals 2 and 3 to each other. The braided conductors A and A 'are assembled by screws 9 made of fluoroethylene or the like with the insulator 4 interposed therebetween.

The braided copper wire portions 1 of the cable terminals 2 and 3
On the 1 'side, bulging semicircular portions 2a and 3a are provided, and the bulging circular portions are formed by the semicircular portions 2a and 3a. A hose 7 made of flexible vinyl chloride or the like is provided so as to cover the entire braided copper wire portions 1, 1 ', and both ends of the hose 7 are bulging circular portions formed by the semicircular portions 2a, 3a. Are tightened to the cable terminals 2 and 3 via the band 8 in a watertight manner.

One of the semicircular portions 2a of the cable terminal 2 is provided with a cooling water inlet 5 for supplying cooling water into a hose 7, and the other of the semicircular portion 2a of the terminal 2 is provided with a cooling water outlet 6
Is provided.

In this embodiment, the high-frequency current flows between the matching transformer of the high-frequency induction heating device and the heating coil, for example, through the reciprocating braided wires A and A 'of the high-frequency coil. In this high-frequency coil, a current reciprocating line is constituted by the flat braided copper wire portions 1 and 1 'and the insulator 4 of a thin sheet sandwiched therebetween, so that even if the length is long, the high-frequency Power can be transmitted, and the loss can be reduced.

In this embodiment, the flat braided copper wire portion 1
1 ', flexible thin sheet insulator 4 and flexible hose 7
And so on, it is flexible and easy to handle.

Further, cooling water is supplied into the hose 7 from the cooling water inlet 5, and the cooling water flows through the hose 7 and is discharged from the cooling water outlet 6 to the outside of the hose 7. The braided copper wire portions 1, 1 'where heat is generated can be effectively cooled.

As described above, the high-frequency cable according to the present embodiment can transmit a large amount of high-frequency power with little loss even if its length is increased, and has sufficient flexibility. Since it is easy to handle and sufficiently cooled, a remarkable effect can be obtained as a high-frequency cable connecting between a matching transformer and a heating coil of a high-frequency induction heating device.

A second embodiment of the present invention will be described with reference to FIG. In this embodiment, two braids are provided with a braided copper wire portion 1 ′ having a rectangular cross section that is substantially half the cross-sectional area of the braided copper wire portion 1 on both sides of a braided conductor A having a braided copper wire portion 1 having a rectangular cross section. Conductors A ′, A ′ are arranged, and the first wire is placed between the braided wires A, A ′.
Insulator 4 similar to that of the embodiment of FIG.
Are the outgoing line and the returning line of the current, respectively, and the other parts are the same as in the first embodiment.

A third embodiment of the present invention will be described with reference to FIG. In this embodiment, four or more (four in the illustrated case) braided conductive wires A and A 'each having braided copper wire portions 1 and 1' having a rectangular cross-section having substantially the same cross-sectional area are alternately provided with the first wire. And the same insulator 4 as that of the second embodiment is interposed therebetween, and the braided conductors A and A 'are used as a current forward line and a current return line, respectively. The other parts are the same as in the first and second embodiments.

The second and third embodiments can also provide the same functions and effects as those of the first embodiment.

[0024]

Since the present invention has the structure described in the claims, the following effects can be obtained. (1) The length of the cable can be lengthened with little loss. (2) Flexible cables are easy to handle. (3) Large electric power can be transmitted by sandwiching the thin plate insulator between the braided conductors and alternately stacking them. (4) By flowing cooling water into a hose that covers two or more braided conductors, the braided conductor that generates heat can be effectively cooled.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of a first embodiment of the present invention.

FIG. 2 is a perspective view showing a detailed structure of the embodiment.

FIG. 3 is a perspective view of a main part of a second embodiment of the present invention.

FIG. 4 is a perspective view of a main part of a third embodiment of the present invention.

[Explanation of symbols]

 1,1 'braided copper wire part 2,3 cable terminal 4 insulator 5 cooling water inlet 6 cooling water outlet 7 hose 8 band 9 screw A, A' braided conducting wire

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-31048 (JP, A) JP-A-2-87495 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01B 7/42 H02G 15/20

Claims (2)

(57) [Claims] 1. A flexible thin-plate insulator is sandwiched between two braided conductors having terminals at both ends and having a flat braided portion, and one braided conductor is used as a forward path of current and the other braided conductor is used for current restoration. A high-frequency cable, wherein the high-frequency cable is a line, and the braid is covered with a flexible insulating hose so that cooling water flows through the hose. 2. A flexible thin-plate insulator is interposed between each of three or more braided conductors having terminals at both ends and having a flat braided portion, and one of the adjacent braided conductors is connected to a current transmission line. A high-frequency cable, wherein the other braided conductor is a return line for current, and the braided part is covered with a flexible hose so that cooling water flows in the hose.