JPH0811024Y2 - Aluminum OF cable connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a connecting portion of an aluminum-clad OF cable, and particularly to a welded portion of an aluminum-clad.

[Prior Art] In FIG. 2, 10 is a cable core, 12 is a core connecting part, 20 is a cable aluminum cover, and 30 is a connecting part aluminum cover.

Expand the end 22 of the cable aluminum jacket 20 to expand the cable core.
A gap is formed between the cable core 10 and the protective sheet 40 (for example, Teflon).

For example, an O-ring 42 is provided between the cable aluminum jacket 20 and the cable core 10 to prevent oil.

Squeeze the end 32 of the connection aluminum cover 30 to
Overlap the end 22 of the 20 and weld the tip. 44 is a weld.

[Problems to be solved by the invention] Although various oil stop structures have been proposed in addition to the above-mentioned O-ring 42, when the oil stop is completely performed, the air in the connection portion expands due to welding heat. At that point, air was blown out, which caused oil leakage, which made welding difficult.

The present invention is designed to allow only air to escape while providing oil stop.

[Means for Solving the Problem] As shown in FIGS. 1a to 1c, (1) the end portion 22 of the cable aluminum sheath 20 and the connection portion aluminum sheath 30.
The oil stop means 50 is provided between the end part 32 of the cable and the end part 32 of the cable aluminum sheath 20.
From a first oil stop layer 52 formed by a heat-shrinkable tube between 22 and the cable core 10, and a second oil stop layer 54 covered at least on the end portion 22 of the first oil stop layer 52. (3) The second oil stop layer 54 is provided with the axial slit 56 only in the upper portion thereof.

[Embodiment] FIG. 1a is a cross-sectional view (the cable core 10 is not crossed), and it is seen from above and only the end 32 of the aluminum cover of the connecting portion is partially removed, and FIG. 1b is shown. It is FIG. 1c which showed the C cross section of FIG. 1a in the figure.

Increasing the diameter of the end portion 22 of the cable aluminum sheath 20 and providing the protective sheet 40 on the cable core 10 are the same as in the conventional case described above.

Note that the end 22 is generally expanded in a trumpet shape that gradually expands toward the end, but in order to simplify the drawing, the end 22 is illustrated in a state where the diameter is expanded in parallel.

50 is an oil stop means, which is composed of a first oil stop layer 52 and a second oil stop layer 54 described below.

The first oil stop layer 52 is made of a heat shrinkable tube, and the material thereof is, for example, fluororesin. This is attached in close contact with the end 22 of the cable aluminum jacket 20 and the protective sheet 40 in the vicinity thereof.

The second oil stop layer 54 is made of, for example, a Teflon sheet. The first oil stop layer 52 has a width corresponding to the portion of the first oil stop layer 52 on the end 22 of the cable cover. It is provided to form (FIGS. 1b and 1c).

The end 32 of the connection part aluminum cover is squeezed onto the second oil stop layer 54. Therefore, the first oil stop layer 52 and the second oil stop layer 54
Is squeezed a little and is in close contact with the cable aluminum cover 20 and the connecting portion aluminum cover 30 to prevent oil leakage except for the slit 56.

After that, the tip of the connection aluminum cover 30 and the cable aluminum cover 30
Welded between 20 and.

[Operation] Since the first oil stop layer 52 only contracts the heat-shrinkable tube, it does not completely seal the cable aluminum sheath 20 and the protective sheet 40.

Therefore, the oil in the cable may not be covered by the aluminum
30 Some may leak inside. However, it is not enough to fill the inside of the aluminum cover 30 of the connection part.

Therefore, even if the slit 56 is formed above the second oil stop layer 54. No oil leaks from this part.

Welding should start from the bottom and progress toward the top.

As described above, the internal air expands due to the welding heat, but the expanded air inside the cable aluminum sheath 20 is the first oil stop layer 52.
It is possible to escape through the inside of the aluminum cover 30 of the connection part. Further, the expanded air inside the aluminum cover 30 of the connecting portion can escape to the outside through the slit 56.

[Advantage of the Invention] Oil stop means 50 is provided between the end portion 22 of the cable aluminum sheath 20 and the end portion 32 of the connection portion aluminum sheath 30;
Reference numeral 50 denotes a first oil stop layer 52 formed by a heat-shrinkable tube over the end 22 of the cable aluminum sheath 20 and the cable core 10 and at least a part of the first oil stop layer 52 on the end 22. Since the second oil stop layer 54 is provided with an axial slit 56 only in the upper part of the second oil stop layer 54, as described above, the cable aluminum sheath 20 and the connecting portion are provided. The expanded air in the aluminum cover 30 can escape and the oil can be prevented from leaking, so that the welding operation can be easily performed.

[Brief description of drawings]

1a to 1c are related to an embodiment of the present invention.FIG. 1a is an explanatory view of a cross section of a main part, and FIG. 1b is a view of FIG. FIG. 1C is an explanatory view showing a partially removed state, FIG. 1C is an explanatory view showing a C cross section of FIG. 1A, and FIG. 10: Cable core, 12: Core connection part 20: Cable aluminum cover, 22: End part 30: Connection part aluminum cover, 32: End part 40: Protective sheet, 42: O-ring 44: Weld part, 50: Oil stop means 52: 1st oil stop layer, 54: 2nd oil stop layer 56: Slit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuichi Okiayu 1-5-1, Kiba, Koto-ku, Tokyo Within Fujikura Electric Wire Co., Ltd. (72) Inventor Shotaro Yoshida 1-1-5, Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (56) Reference JP-A-62-131719 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An end 32 of a connection aluminum cover 30 is superposed on an end 22 of a cable aluminum cover 20 having an expanded diameter, and the tip of the connection aluminum cover 30 and the cable aluminum cover 20 are welded together. In the connection part of the aluminum-covered OF cable, the following oil stop means 50 is provided between the end 22 of the cable aluminum-cover 20 and the end 32 of the connection part aluminum-cover 30; that is, the end of the cable aluminum-cover 20. A first oil stop layer 52 formed of a heat-shrinkable tube over the portion 22 and the cable core 10, and a second oil stop layer 54 overlaid on at least the end portion 22 of the first oil stop layer 52. A connecting portion of an aluminum-covered OF cable, in which an oil stop means 50 made of is provided, and the second oil stop layer 54 is provided with an axial slit 56 only in an upper portion thereof.