JPS59136711A - Watertight connection structure between optical submarine cable and optical submarine cable joint box - Google Patents

Abstract

PURPOSE:To obtain high watertightness which maintains electric conduction by arranging a metallc O or C ring between the internal surface of a sleeve which pierces a thin metallic pipe fixed to an anchor and the external surface of the thin pipe. CONSTITUTION:An anchor 3 and a copper tube 2 are shown in the figure on a large scale; and the thin metallic pipe 13 with less thickness deviation is brazed to the metalic O or C ring 12 and copper ring 2 at points 13a and 13b, and a O ring 14, the sleeve 15, and a nut 16 for fixing the sleeve 15 to the anchor 3 are rovided. Then, thin metal 13 is brazed to the copper tube 2 of a cable to form a complete contacting surface, obtaining excellent watertightness and conductivity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a watertight connection structure between an optical submarine cable and an optical submarine cable joint box.

Figure 1 is a schematic diagram of the watertight connection between an optical submarine cable and an optical submarine cable joint box currently in use, where 1 is a optical fiber cable, 2 is a copper tube of the optical submarine cable, and 3 is a tensile strength wire. An anchor to keep 10 in place,
4 is a safety pipe having a part 5.5a with a solder filter 5 between the anchor 3 and the copper tube 2 to maintain watertightness;
The brazing between the safety pipe 4 and the copper tube 2 is
5a is the brazing part between the safety pipe 4 and the anchor 3;
6 is the polyethylene insulator of the cable 1, 7 is the polyethylene mold, 8 is the polyethylene insulator for the anchor 3, 9 is the cylinder for water pressure resistance, 10 is the tensile strength wire of the optical submarine cable, 11 is the tensile strength wire IO of the anchor 3 It is a four-pointed metal cone that holds it in place. In the connection part of this structure, when a variable load or high tension is applied repeatedly, slipping occurs between the tensile strength wire 10 and the copper tube 2 as the tension increases, that is, relative movement near the terminal ends occurs, and eventually the safety pipe 4 or the copper tube 2 2 may break.

The present invention provides a watertight connection structure between an optical submarine cable and an optical submarine casing joint box that can solve these conventional problems.

The present invention will be explained in detail below.

The principle of the present invention is that instead of the safety pipe 4 in the conventional structure, a thin-walled metal pipe with less uneven thickness and a high degree of finishing accuracy on the outer surface is brazed onto the copper tube of the cable.
There is a metal O-ring or metal C between this thin metal pipe and the anchor.
By using the ring, it is possible to slide and maintain a good electrical connection, that is, water tightness and conductivity.

The metal O-ring and metal C-ring have an O-shaped cross section, respectively.
A C-shaped metal ring, for example,
No. 3334.

FIG. 2 is an enlarged view of the area between the anchor 3 and the copper tube 2 in order to explain the present invention in detail. 12 is Kanagiri O
ring or metal C-ring, 13 is 13a or 13a and 13b and is a thin metal pipe with less nuisance, which is brazed to the copper tube 2, 14 is an O-ring, 15 is three 7',
Numeral 16 is a nand for fixing the sleeve 15 to the anchor 3. Other components are the same as those of the conventional example shown in FIG.

The copper tube 2 of the cable 1 is constructed by vertically welding a thin copper tape to the outside of the tensile strength wire 10 and squeezing it with a die. In direct contact with a ring or a metal C-ring, mutual contact is not perfect, and therefore watertightness and conductivity are not perfect. Therefore, in the present invention, by brazing the five-sided metal pipe 13 to the copper tube 2 of the cable 1,
It is constructed to provide a complete contact surface and good watertightness and electrical conductivity.

The O-ring 14 is auxiliary. Furthermore, if the conductivity between the copper tube 2 and the anchor 3 is always maintained and tension is applied to the cable l, the copper tube 2 will move slightly relative to the anchor 3. Strength・
However, since the copper tube 2 slides on the metal O-ring or the metal C-ring 12 at this time, there is no fear that the copper tube 2 will break.

As described above, the present invention realizes a watertight connection structure between an optical submarine cable and an optical submarine cable joint box that has high watertight characteristics while always maintaining electrical continuity using a metal O-ring or a metal C1l-ring. be.

[Brief explanation of drawings]

Fig. 1 is a side view including a partial longitudinal section showing an example of a watertight connection structure between a conventional optical submarine cable and an optical submarine cable joint box, and Fig. 2 is a longitudinal section showing the main parts of an embodiment of the present invention. It is a front view. Engineering: Optical submarine cable, 2: Copper tube, 3
...Anchor, 4...Safety pipe, 5.5
a...Brazing part, 6...Polyethylene insulator,
7... Polyethylene mold, 8... Polyethylene insulator, 9... Water pressure resistant cylinder, 10...
Tensile strength line, 11...Metal cone, 12...Metal Osu. ng or metal Cl) ng, 13...metal pipe, 1
3a, 13b...brazing part, 14...0 ring, 15...sleeve, 16...nando. Patent applicant Kokusai Telegraph Ryuga Co., Ltd.

Claims (1)

[Claims] an inner surface of a sleeper in which an optical submarine cable is slidably inserted into a center hole of an anchor with a thin-walled metal pipe hermetically fixed on the metal tube, and the thin-walled metal vibrator fixed to the anchor is penetrated; A watertight connection structure for an optical submarine cable and an optical submarine cable joint box, characterized in that a metal O-ring or a metal C-ring is disposed between the outer surface of the thin-walled pipe and the outer surface of the thin-walled pipe.