JPH0523347U - High frequency cable - Google Patents

Abstract

(57) [Abstract] [Purpose] It is intended to suppress an increase in the cable wire diameter of a high frequency cable, and particularly to improve workability of a cable end treatment. [Construction] In a high frequency cable, a desired number of strand enamel insulated wires are twisted together to form a conductor, and two of the obtained twisted strand insulated conductors are arranged in parallel at a desired interval to form a two-core The core twisted strand insulated conductor is insulated by using an insulator having a volume resistivity of 10 ¹² Ω · cm or more and an insulator bridge portion of 0.5 mm or more and less than 10 mm between the two core conductors. It is characterized by

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high frequency cable used between an electric device such as an electromagnetic cooker that uses high frequency current and a high frequency generator.

[0002]

[Prior Art]

 Conventionally, as such a high-frequency cable, a vinyl-insulated vinyl cabtyre cable having the structure shown in FIG. 2 has been generally used. That is, in FIG. 2, 10 is a conductor made of a twisted wire of an annealed copper wire, which is covered with, for example, PVC 11 to obtain an insulated wire core 12. As an example, the 12 wires are bundled and a holding tape 13 is wound, It is configured by forming a sheath 14 made of PVC.

The six cores of the insulated wire core 12 are collectively used as the (+) side, and the remaining six cores are collectively used as the (−) side.

[0004]

[Problems to be solved by the device]

 In the above-mentioned high-frequency cable, a high-frequency current, for example, a current of about 30 KHz is applied, and the current tends to concentrate on the conductor surface due to the so-called skin effect. For this reason, it is inevitable that the conductor size must be increased, and economic problems and handling problems associated with the increase in the cable outer diameter cannot be avoided. It is an object of the present invention to solve the problems such as the increase in the cable size and the cable end processability in the high frequency cable described above.

[0005]

[Means for Solving the Problems]

According to the present invention, the desired number of enamel insulated wires obtained by coating and baking an insulating resin on a wire conductor are twisted into a wire insulated conductor, and two of the obtained twisted wire insulated conductors are desired. The two-core twisted insulated wire conductor is a two-core twisted insulated wire conductor, wherein the two-core twisted insulated wire conductor is made of an insulator having a volume-specific resistance of 10 ¹² Ω · cm or more. It is a high-frequency cable characterized by being insulation-coated with an insulator bridge portion of 0.5 mm or more and less than 10 mm interposed therebetween.

In the present invention, as the insulating resin coated and baked on the wire conductor, polyurethane resin, polyester resin, polyimide resin, polyamide resin, amideimide resin or the like is used. It is particularly desirable to use polyurethane that can be easily thermally decomposed and removed simply by immersing it in a solder bath during terminal treatment.

In addition, as an insulator for a two-core twisted element wire insulated conductor and for a bridge between the twisted element wire insulated conductors, a volume resistivity of 10 ¹² Ω · cm or more is particularly preferable. Ethylene, vinyl chloride, polypropylene, polyurethane, fluororesin, etc. are used. If the volume resistivity is less than 10 ¹² Ω · cm, the insulation characteristics of the product will be insufficient, which is not suitable.

Next, in the present invention, the reason why the insulator bridge portion provided between the two-core twisted strand insulated conductors has a width of 0.5 mm or more and less than 10 mm will be described.

Originally, it is desirable that this be large in terms of withstand voltage between the two conductors, and on the other hand, it should be small in terms of the inductance of the high frequency cable. The smaller the width, the better the size of the cable. On the other hand, considering the separation between the two conductors when processing the cable end, it is sufficient if there is enough width for the cutter knife. From the above viewpoints, the thickness is limited to 0.5 mm or more and less than 10 mm, particularly preferably 1.0 mm to 5.0 mm.

[0010]

In the high-frequency cable of the present invention, each of the two-core conductors is formed by bundling and twisting a large number of the above-described strand wire enamel insulated wires, each of which has a sheath on the outside thereof. Therefore, the problem due to the increase in the cable diameter due to the skin effect described above is avoided in advance.

Moreover, since the two-core stranded wire insulated conductors, each of which has an insulating sheath, are configured via the insulating bridge portion, sufficient pressure resistance is obtained by interaction with the wire insulation. While maintaining, the separation of the conductor cores from each other in the terminal processing work is significantly simplified, and the work is facilitated.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. A wire enamel insulated wire 3 obtained by applying a urethane resin coating baking layer 2 on a copper wire 1 was obtained. A conductor 4 formed by assembling and twisting 50 of the strand-insulated electric wires 3 was arranged in two cores as shown in the figure.

Next, using a vinyl chloride resin mixture having a volume specific resistance of more than 10 ¹² Ω · cm, the insulator bridge portion 5a having a longitudinal width 1 of 5 mm between the two-core conductors 4 and 4 is used. The covering protective sheaths 5b and 5c were integrally formed on the conductors 4 and 4 via the above to obtain a high frequency cable.

When the high-frequency cable of the obtained example was evaluated, the current capacity was much larger than that of the conventional product of FIG. 2 with the same conductor size. Also, if the same current capacity is used as the base, the cable weight is reduced by about 20%. Furthermore, the above-mentioned two-core twisted element insulated conductor is divided into two parts via the bridge portion, and the terminal treatment is remarkably easy, for example, conductor division during terminal treatment can be easily performed, and the terminal treatment portion The configuration could be made compact.

In FIG. 1, reference numeral 6 denotes a fragile portion such as a notch formed in the longitudinal direction of the bridge portion 5a. By providing the fragile portion 6 on one side or both sides, the conductor separation of the two cores is further improved. Can be facilitated.

[0016]

[Effect of the device]

 As described in detail above, according to the present invention, each of the two-core conductors is formed by bundling and twisting the above-mentioned multiple strands of wire enamel insulated wire, and each of them has a sheath on the outside thereof. Since the structure has been applied, the problem due to the increase in the cable diameter due to the skin effect described above can be avoided. In addition, since the two-core stranded wire insulated conductors insulated by each of the above-mentioned pieces are arranged through the insulating bridge portion, sufficient withstand voltage is maintained by interaction with the wire insulation. In addition, the separation of the conductor cores from each other in the terminal treatment work is significantly simplified, and the work is facilitated.

[Brief description of drawings]

FIG. 1 is a sectional view of a high frequency cable of the present invention.

FIG. 2 is a sectional view of a conventional example.

[Explanation of symbols]

 3 Enameled insulated wire 4 Conductor 5a Insulator bridge 5b, 5c Sheath

Claims (1)

[Scope of utility model registration request] 1. A desired number of enamel wires obtained by coating and baking an insulating resin on a wire conductor are twisted together to form an insulated wire conductor, and two of the obtained twisted insulated wire conductors are separated by a desired distance. Are arranged in parallel with each other to form two cores, and the twisted insulated wire conductors of the two cores have a volume resistivity of 10
^Use an insulation material of ¹² Ω · cm or more and 0.5 between the two core conductors.
A high-frequency cable characterized by being insulation-coated through an insulator bridge section of 10 mm or more and less than 10 mm.