阅读说明：本技术 一种多维度阻水阻氢海底光缆及其成型工艺 (Multi-dimensional water-resistant and hydrogen-resistant submarine optical cable and forming process thereof ) 是由 许人东 胥国祥 刘斌 张超 范明海 李涛 王畅 于文慧 于 2020-03-18 设计创作，主要内容包括：本发明涉及一种多维度阻水阻氢海底光缆及其成型工艺,包括光纤、包在光纤外的不锈钢管、包在不锈钢管外的钢丝层、包在钢丝层外的铜管、包在铜管外的绝缘层,不锈钢管为激光焊无缝不锈钢管,铜管为三枪氩弧焊无缝铜管,不锈钢管中填充吸氢纤膏,钢丝层有绕不锈钢管轴线环形阵列分布的钢丝绞合而成,钢丝上涂覆有阻水胶,铜管外与绝缘层之间设有粘结层。本发明通过吸氢纤膏、无缝不锈钢管、无缝铜管、绝缘层实现多重径向阻水阻氢,通过吸氢纤膏、阻水胶涂覆与钢丝一体成型、铜管与绝缘层之间设置粘结层实现海底光缆全截面纵向阻水。(The invention relates to a multidimensional water-blocking and hydrogen-blocking submarine optical cable and a forming process thereof, and the multidimensional water-blocking and hydrogen-blocking submarine optical cable comprises optical fibers, a stainless steel pipe wrapped outside the optical fibers, a steel wire layer wrapped outside the stainless steel pipe, a copper pipe wrapped outside the steel wire layer, and an insulating layer wrapped outside the copper pipe, wherein the stainless steel pipe is a laser welding seamless stainless steel pipe, the copper pipe is a three-gun argon arc welding seamless copper pipe, hydrogen absorption fiber paste is filled in the stainless steel pipe, the steel wire layer is formed by twisting steel wires which are distributed in an annular array around an axis of the stainless steel pipe, water-blocking glue is coated on the steel wires, and a. The invention realizes multiple radial water and hydrogen resistance through the hydrogen absorption fiber paste, the seamless stainless steel pipe, the seamless copper pipe and the insulating layer, and realizes the longitudinal water resistance of the whole cross section of the submarine optical cable through the hydrogen absorption fiber paste, the water resistance glue coating and the steel wire integrated forming, and the bonding layer arranged between the copper pipe and the insulating layer.)

1. The multidimensional water and hydrogen resistant submarine optical cable comprises optical fibers, stainless steel tubes wrapped outside the optical fibers, steel wire layers wrapped outside the stainless steel tubes, copper tubes wrapped outside the steel wire layers and insulating layers wrapped outside the copper tubes.

2. The multi-dimensional water and hydrogen blocking submarine optical cable according to claim 1, wherein the filling rate of the hydrogen-absorbing fiber paste in the stainless steel tube is more than 95%.

3. The multi-dimensional water and hydrogen blocking undersea optical fiber cable of claim 1, wherein said bonding layer is an ethylene acrylic acid copolymer adhesive.

4. The multi-dimensional water and hydrogen blocking submarine optical cable according to claim 1, wherein the steel wires of said steel wire layer comprise steel wires of various outer diameters.

5. The multi-dimensional water and hydrogen blocking submarine optical cable according to claim 1, wherein said hydrogen-absorbing fiber paste is a hydrophobic gel containing a hydrocarbon oil and a polymer as main components.

6. The multi-dimensional water and hydrogen blocking submarine optical cable according to claim 1, wherein said water blocking glue is a two-component elastomer non-water swellable water blocking material consisting of isocyanate and polyol.

7. The multi-dimensional water and hydrogen blocking undersea optical cable of claim 1, wherein said insulating layer is a high density polyethylene layer.

8. A forming process of a multi-dimensional water and hydrogen resistant submarine optical cable is characterized by comprising the following steps:

s1, accurately controlling laser power, defocusing amount and welding speed through laser welding to realize continuous seamless welding of the stainless steel pipe, filling hydrogen absorption fiber paste in the stainless steel pipe through a secondary pressure pump and a filling needle tube, accurately designing the size of the needle tube, controlling the position of the needle tube and the temperature of the fiber paste, and realizing that the filling rate of the hydrogen absorption fiber paste is more than 95%;

s2, stranding three different-diameter inner armor steel wires, and adding water-blocking glue when the steel wires are stranded and molded to realize integral molding;

s3, drawing and forming the copper strip outside the steel wire layer after three-gun argon arc welding, wherein the drawing ensures that the inner wall of the copper tube is embedded between the steel wire gaps of the steel wire layer;

s4: and extruding the bonding layer and the insulating layer outside the copper pipe by a double-screw long-time serial extrusion process, and cooling the cable by sectional type water tank cooling after extrusion molding.

Technical Field

The invention relates to the technical field of submarine optical cables, in particular to a multi-dimensional water and hydrogen resistant submarine optical cable and a forming process thereof.

Background

The submarine optical cable carries out signal transmission through the central optical fiber, the optical fiber attenuation is extremely sensitive to hydrogen, meanwhile, the relay submarine optical cable needs to operate high-voltage-level direct current, and the submarine optical cable is required to have radial water and hydrogen blocking capacity for guaranteeing the reliability of the submarine cable. On the other hand, the submarine optical cable may be broken by human or natural factors during long-term operation, and in order to prevent seawater from penetrating through the whole submarine cable and reduce the length of the submarine cable discarded during submarine cable maintenance as much as possible, the submarine cable is required to have the capability of resisting longitudinal seawater infiltration under the specified water depth. With the increasing of the applied water depth of the submarine optical cable, especially in a trans-Pacific submarine optical cable system, the typical applied water depth is 8000m, and the extreme water depth exceeds 10000 m, which puts a very strict requirement on the radial and longitudinal water and hydrogen blocking performance of the submarine optical cable. The radial and longitudinal water and hydrogen blocking performance of the traditional submarine optical cable is limited, and the traditional submarine optical cable is difficult to be applied to water depth of 8000m or even 10000 m.

The existing submarine optical cable with high water resistance is disclosed as Chinese patent publication CN110426798A, and the submarine optical cable with high capacity and low resistance is an ocean-crossing relay submarine optical cable, and comprises a cable core, an armor layer and a sheath which are sequentially and correspondingly arranged from inside to outside, wherein the cable core comprises internal optical fibers and external stainless steel tube optical units, the optical fibers are provided with a plurality of optical fibers and are filled in the tubes of the stainless steel tube optical units through fiber paste, the armor layer is formed by twisting a first metal wire unit, a second metal wire unit and a third metal wire unit, and a twisting gap of the armor layer is filled with water-blocking glue.

However, the above design can only ensure the laying and recovery of the submarine optical cable at the water depth of 8000m at most, and cannot realize hydrogen resistance.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a multi-radial water-blocking and hydrogen-blocking submarine optical cable with full-section longitudinal water-blocking and a forming process thereof.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a multidimension degree hinders water and hinders hydrogen submarine optical cable, includes optic fibre, package stainless steel pipe outside the optic fibre, package are in steel wire layer outside the stainless steel pipe, package are in copper pipe outside the steel wire layer, package are in insulating layer outside the copper pipe, the stainless steel pipe is the seamless stainless steel pipe of laser welding, the copper pipe is three-gun argon arc welding seamless copper pipe, fill in the stainless steel pipe and inhale the hydrogen fine cream, the steel wire layer is formed by winding the steel wire transposition of stainless steel pipe axis ring shape array distribution, the coating of steel wire clearance has the glue that hinders water, the copper outside of tubes with be equipped with the tie coat between the insulating layer.

In the design, multiple radial water and hydrogen resistance is realized through hydrogen absorption fiber paste, a seamless stainless steel pipe, a seamless copper pipe and an insulating layer, the hydrogen absorption fiber paste, the water-blocking glue coating and the steel wire are integrally formed, and a bonding layer is arranged between the copper pipe and the insulating layer to realize the longitudinal water and hydrogen resistance of the whole cross section of the submarine optical cable.

As a further improvement of the design, the filling rate of the hydrogen absorption fiber paste in the stainless steel pipe reaches more than 95 percent. Effectively ensures the whole section of the light unit to longitudinally block water and hydrogen.

As a further improvement of the design, the bonding layer is an ethylene acrylic acid copolymer adhesive, so that the bonding performance is excellent, the bonding force between the copper pipe and the insulation is obviously enhanced, and the longitudinal water resistance of the copper pipe and the insulation interface is realized.

As a further improvement of the present design, the steel filaments of the steel filament layer comprise steel filaments of various outer diameters. Reducing the gaps between the steel wires.

As a further improvement of the design, the hydrogen absorption fiber paste is a hydrophobic gel taking alkane oil and polymer as main components, and effectively blocks water and hydrogen.

As a further improvement of the design, the water-blocking adhesive is a bi-component elastomer non-water-absorption expansion type water-blocking material consisting of isocyanate and polyol, and can realize high-water-pressure water blocking.

As a further improvement of this design, the insulating layer is a high density polyethylene layer, which has significantly better water penetration resistance than medium and low density polyethylene.

The technical scheme of the invention also provides a forming process of the multidimensional water and hydrogen resistant submarine optical cable, which comprises the following steps:

s1, accurately controlling laser power, defocusing amount and welding speed through laser welding to realize continuous seamless welding of the stainless steel pipe, filling hydrogen absorption fiber paste in the stainless steel pipe through a secondary pressure pump and a filling needle tube, accurately designing the size of the needle tube, controlling the position of the needle tube and the temperature of the fiber paste, and realizing that the filling rate of the hydrogen absorption fiber paste is more than 95%;

s2, stranding three different-diameter inner armor steel wires, and adding water-blocking glue when the steel wires are stranded and molded to realize integral molding;

s3, drawing and forming the copper strip outside the steel wire layer after three-gun argon arc welding, wherein the drawing ensures that the inner wall of the copper tube is embedded between the steel wire gaps of the steel wire layer;

s4: and extruding the bonding layer and the insulating layer outside the copper pipe by a double-screw long-time serial extrusion process, and cooling the cable by sectional type water tank cooling after extrusion molding.

The invention has the beneficial effects that: according to the invention, multiple radial water and hydrogen resistance is realized through the hydrogen absorption fiber paste, the seamless stainless steel tube, the seamless copper tube and the insulating layer, the whole-section longitudinal water and hydrogen resistance of the submarine optical cable is realized through the hydrogen absorption fiber paste, the water-resistant glue coating and the steel wire integrated molding, and the bonding layer is arranged between the copper tube and the insulating layer.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic transverse cross-section of the present invention.

In the figure, 1, an optical fiber, 2, hydrogen absorption fiber paste, 3, a bonding layer, 4, an insulating layer, 5, a copper pipe, 6, water-blocking glue, 7, a steel wire layer and 8, a stainless steel pipe are arranged.

Detailed Description

The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided only for the purpose of illustrating the present invention and are not to be construed as limiting the present invention.