JPH0224980A - Insulated junction for rubber plastic cable - Google Patents

Abstract

PURPOSE:To dispense with a skill in the manufacturing work and stabilize the performance by arranging an insulating heat shrinking tube in the middle of conducting heat shrinking tubes and heat-shrinking a composite heat shrinking tube on a junction reinforcing insulating Iayer as a whole. CONSTITUTION:An insulating heat shrinking tube 36' is arranged in the middle of conducting heat shrinking tubes 32' and 34' to form a continuous integrated body, a composite heat shrinking tube 30 with nearly the uniform thickness is used as a whole. The left side junction shielding layer 32 and the right side junction shielding layer 34 and the lower section 36 of a cutoff insulator are formed by shrinking the tube 30 on a junction reinforcing insulating Iayer. The upper section 38 of the cutoff insulator is formed on the lower section 36 and the end section of the shielding layer 32 adjacent to it, the extension section 42 of the shielding layer 34 is provided on the upper section 38, its tip 44 is overlapped on the end section 33 of the shielding layer 32.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an insulated connection part for rubber/plastic cables, and particularly to an insulated connection part formed using a heat-shrinkable tube.

[Prior art] [1] In the case of Fig. 2a: 10 is a reinforcing insulator for the connection part, 12 is a cable insulator, 1
4 is a cable outer conductive layer, and 16 is a cable sheath.

18 is a left-side connection portion shielding layer; 22 is an edge-cut insulator provided on the tip portion 20 of the left-side connection portion shielding layer.

Reference numeral 24 denotes a right-hand connection portion shielding layer, the tip portion 26 of which overlaps above the tip portion 20 of the left-hand connection portion shielding layer.

In addition, in the above description, the right side and the left side are added for convenience of explanation with respect to the drawings, and mean one side and the other side. This also applies to the subsequent explanations.

The above-mentioned insulating connection portion was formed as follows.

That is, left and right connections are made on the reinforcing insulator 10 formed by extruding uncrosslinked polyethylene or winding the same tape. The basic part of the A-shielding layer 18, 24 is formed by shrinking a conductive heat-shrinkable tube, and the basic part of the edge-cutting insulator 22 is formed by wrapping with tape, and then heat-molded. be.

[2] In the case of Fig. 3: Conductive heat-shrinkable tube 18" which becomes the shielding layer on the left side of the connection part
A conductive heat-shrinkable tube 24°, which will become the right-side shielding layer, and an insulating heat-shrinkable tube 22°, which will become the edge-cut insulator, were molded together in advance. Special heat shrink tubing 28 is used to form the shielding layer and edges.

[Problems to be Solved by the Invention] [1] In the case of Fig. 2a: (1) The method of insulating the edge slits described above relies heavily on the skill of the worker, and the Depends on skill level and attentiveness.

(2) For example, the tip 20 of the left shielding layer 18 may dig into the reinforcing insulator 10 as shown in FIG. 2b, resulting in an extremely low dielectric strength.

[2] In the case of Fig. 3: The special heat shrinkable tube 28 described above requires a long time to shrink because the tube thickness at the edge-trimmed insulator portion is usually more than twice that of the other portions. Uniform contraction requires skill.

[Object of the Invention] To provide an insulated connection part that does not require any skill in its production and has stable performance.

[Means for Solving the Problem] As shown in Figures 1a-1C, (1) An insulating heat-shrinkable tube 36° is placed in the middle of two conductive heat-shrinkable tubes 32' and 34'. (2) The left side connecting portion shielding layer 32, the right side connecting portion shielding layer 34, and the lower part 36 of the edge-cut insulator are made into a continuous integral piece and have a substantially uniform wall thickness as a whole. is formed by shrinking the composite heat shrink tubing 30 described above onto the splice reinforcing insulating layer (3) over the end of the edge-cut insulator lower portion 36 and the adjacent left splice shielding layer 32; , upper part of edge cut insulator 3
8 is formed; and an extension portion 42 of the right connection portion shielding layer 34 is provided on the edge cutting insulator upper portion 38, and its tip 44 overlaps above the end portion 33 of the left side connection portion shielding layer 32. Take composition.

[Example] 30 in FIG. 1a is a composite heat shrink tube.

This involves placing two conductive heat-shrinkable tubes 32' with the same inner diameter and wall thickness, facing each other by extending the 34° end portions over several layers, and using the gap between the above heat-shrinkable tubes and the inner diameter and wall thickness They are connected by an insulating heat-shrinkable tube 36' having approximately the same diameter.

Therefore, the composite heat-shrinkable tube 30 is a continuous integral piece as a whole, and has a substantially uniform inner diameter and wall thickness over its entire length.

FIG. 1b is an explanatory diagram of an insulated connection part made using the composite heat-shrinkable tube 30 described above, and the main part thereof is shown enlarged in FIG. 1C.

The composite heat-shrinkable tube 30 heat-shrinked onto the connection reinforcing insulator 10: - The left-side connection shielding layer 32 is formed by the conductive heat-shrink tube 32'; - The right-side connection shielding layer is formed by the conductive heat-shrink tube 34'. 34, - A lower part 36 of the edge cut insulator is formed by an insulating heat shrink tube 36°, respectively.

As described above, the composite heat-shrinkable tube 30 has a substantially uniform wall thickness throughout and has no particularly thick parts, so that the heat-shrinking work can be easily carried out.

The edge cutting insulator 4 together with the lower part 36 of the edge cutting insulator mentioned above
The upper part 38 of the edge-cut insulator 38 and the extension part 42 of the right side connecting portion shielding layer 34 are formed by field construction and are integrally molded together with the shrunken composite heat shrink tube 30 described above.

The upper part 38 of the edge-cut insulator is formed by wrapping tape or the like.

Extension portion 42 is formed from conductive heat shrink tubing.

The right end portion of the extension portion 42 is in close contact with the right connection portion shielding layer 34 , and the tip portion 44 is provided so as to overlap above the end portion 33 of the left side connection portion shielding layer 32 .

The third part of the edge cutting insulator and the extension part 42 are constructed on-site as described above, but since these parts have little effect on the electrical properties of the connection part, it is necessary to have highly skilled workers. Doesn't require attention.

The upper part 38 of the edge-cutting insulator is provided from the lower part 36 of the edge-cutting insulator to the end 33 of the left side connection part shielding layer 32, and the extension part 42 extends from the right side connection part shielding layer 34 as shown in phantom lines in FIG. 1c. It may also be made to stand up from the tip.

[Effects of the invention J (1) An insulating heat shrinkable tube is placed in the middle of two conductive heat shrinkable tubes to form a continuous integral body, and the overall thickness is made almost uniform. The left side connection part 1 is made by heat-shrinking the shrink tube onto the connection part reinforcing insulating layer! Since the shielding layer, the right-side connection portion shielding layer, and the lower part of the edge cut insulator are formed, there is no thick part in the wall as in the conventional case, and therefore the heat shrinking work is easy.

(2) The upper part 38 and extension part 42 of the edge cut insulator formed on the shrunk composite heat shrink tube will be constructed on site as described above, but these parts have little effect on electrical performance, so It does not require a high degree of skill or attentiveness.

[Brief explanation of the drawing]

Figures 1a-1c are related to the embodiment of the present invention, Figure 1a is an explanatory diagram of the composite heat shrinkable tube used, Figure 1b is a schematic diagram of the insulated connection part, and Figure t51c is an enlarged view of the main part thereof. The explanatory diagram, Figure 2a, is an explanatory diagram of the prior art, and Figure 2b is an explanation of its drawbacks! ! 1 and 3 are explanatory diagrams of another conventional technique. 30: Composite heat shrink tube 32: Left side connection portion shielding layer 33: End portion 34: Right side connection portion shielding layer 36: Lower part of edge cut insulator 38: Upper part of edge cut insulator 40: Edge cut insulator 42: Extension portion 44: Tip 32', 34': Conductive heat shrink tube 36': Insulating heat shrink tube Patent applicant: Fujikura "It Line Co., Ltd."

Claims (1)

[Claims] An insulating heat shrink tube is placed in the middle of two conductive heat shrink tubes to make them one continuous piece,
A composite heat-shrinkable tube having a substantially uniform wall thickness as a whole is heat-shrinked onto a reinforcing insulating layer for the connecting portion, thereby forming the left side connecting portion shielding layer, the right side connecting portion shielding layer, and the lower part of the edge cut insulator; an upper part of the edge cutting insulator is formed on the lower edge of the edge cutting insulator and an end of the left side connection part shielding layer adjacent thereto, and an extension of the right side connection part shielding layer is provided on the edge cutting insulator; and an insulated connection part of the rubber/plastic cable, the tip of which overlaps above the end of the left connection part shielding layer.