CN211427922U

CN211427922U - Anti-interference armored signal cable

Info

Publication number: CN211427922U
Application number: CN201921471040.9U
Authority: CN
Inventors: 江勇
Original assignee: Tianjin Dafanhua Petroleum Technology Co ltd
Current assignee: Tianjin Dafanhua Petroleum Technology Co ltd
Priority date: 2019-09-08
Filing date: 2019-09-08
Publication date: 2020-09-04
Anticipated expiration: 2029-09-08

Abstract

The utility model provides an anti-interference armor signal cable, including being used for providing mechanical strength for the cable and being used for protecting the pipe of optic fibre, the pipe contains the optic fibre of embedding filler material, has high mechanical strength's spiral metal wire, sets up the first extrusion sheath between pipe and spiral metal wire, sealing material in the clearance between the spiral metal wire for bear around the outside second sheath of the wearing and tearing of spiral metal wire, the conducting bar constitutes the inside conductive device of cable, outside second sheath is electrical insulation, and spiral metal wire with semiconductor interface layer has between the outside second sheath, the semiconductor interface layer is filled outside space between the spiral metal wire.

Description

Anti-interference armored signal cable

Technical Field

The utility model discloses an anti-interference armor signal cable specifically is signal cable technical field.

Background

A signal cable is a signal transmission means. The signal cable has a very small transmitted signal, so as to avoid the signal interference, the signal cable is provided with a shielding layer outside, the shielding layer of the wrapped conductor is generally conductive cloth, a woven copper mesh or copper foil (aluminum), the shielding layer needs to be grounded, an external interference signal can be guided into the ground by the shielding layer, the interference of the interference signal entering the inner conductor is avoided, and the loss of the transmitted signal is reduced. The existing signal cable has weak transmission signal and complex manufacturing process, so in recent years, a lot of experts in China make a lot of researches on how to realize connection and transmission of a large number of zero magnetic field interference signals in a limited space. Therefore, an anti-interference armored signal cable is put into use to solve the problem.

Disclosure of Invention

An object of the utility model is to provide an anti-interference armor signal cable to solve the problem that proposes among the above-mentioned background art. In order to achieve the purpose, the invention provides the following technical scheme: an anti-tamper armored signal cable comprising a tube for providing mechanical strength to the cable and for protecting the optical fiber, said tube containing an optical fiber embedded in a filler material, a helical metal wire having high mechanical strength, a first extruded jacket disposed between the tube and the helical metal wire, a sealing material in the interstices between the helical metal wire, an outer second jacket for withstanding abrasion around said helical metal wire, the conductive strips constituting the inner conductive means of the cable, said outer second jacket being electrically insulating and having a semiconducting interfacial layer between said helical metal wire and said outer second jacket, said semiconducting interfacial layer filling the outer interstices between said helical metal wires.

Further, the conductive strips are arranged on the first extruded sheath and are welded longitudinally or wound helically in one or more layers, or are placed along the first extruded sheath, which itself is extruded directly on the tube containing the optical fibers.

Drawings

FIG. 1 is a cross-sectional view of the present invention.

In the figure: 1 tube, 2 silica gel, 3 optical fiber, 4 first extruded sheath, 6 spiral metal wire, 7 outer second sheath, 8 sealing material, 9 semiconductor interface layer, 10a, 10b wire

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.

The anti-interference armored signal cable comprises a tube 1 filled with a sealing compound and silica gel 2 in which an optical fiber 3 is embedded. The optical fibres 3 are laid helically and their length may optionally be greater than the length of the tube. The pipe 1 is subjected to water pressure and is made of metal, preferably steel. It is welded longitudinally by laser or by arc welding under inert gas, or by plasma arc or any other suitable method. The tube 1 can also be made of extruded plastic for imparting sufficient pressure resistance to the cable.

The anti-tamper armored signal cable further comprises a first extruded jacket 4, the first extruded jacket 4 being disposed about the tube 1 and protecting it from corrosion or localized extrusion. This first extruded sheath 4 is surrounded by a conductive strip, made of copper or aluminium or other metal or alloy, which is a very good electrical conductor, welded longitudinally to form the tube 1 around the first extruded sheath 4, or it is wound helically in one or more layers on said first extruded sheath.

Around the conductive strip a helical wire 6 is provided, having high mechanical strength and preferably made of steel, the helical wire 6 may constitute a single layer, or it may constitute a multilayer comprising a plurality of laying in the same direction or in opposite directions. The helical wire 6 provides mechanical traction strength to the cable, which also has an arched character, which is advantageous in particular if the tube 1 is made of plastic and does not have sufficient compressive strength.

The gaps between the spiral wires and the conductive strips are filled with a sealing material 8, such as polyurethane resin or any other material capable of performing this sealing function, to resist the propagation of water in the longitudinal direction of the cable, in particular in case of damage to the immersed cable.

An outer second sheath 7 made of polyethylene or any other electrically insulating and wear-resistant material is formed as one or more layers on the helical wire 6, the thickness of the outer second sheath 7 being set according to the degree of electrical isolation and mechanical protection required.

The first extruded sheath 4 essentially performs a filling function to fill the resulting cable to a sufficiently large diameter to have satisfactory mechanical properties for use at great depths.

The semiconductor interfacial layer 9 is interposed between the outer second sheath 7 and the spiral metal wire 6, and it fills an outer space between the outer second sheath 7 and the peripheral wire of the spiral metal wire 6. The semiconducting interfacial layer 9 has a very low conductivity and is for example made of polyethylene filled with conductive particles, in particular carbon particles. Where applicable, a copolymer is used for ensuring adhesion between the semiconductor interface layer 9 and the wires in the spiral metal wire 6. The semiconducting interfacial layer 9 serves to avoid strong electric field concentrations occurring at the sharp points, since such concentrations risk damaging the outer sheath. This makes it possible to reduce the thickness of the outer sheath 7.

It is also advantageous that the sealing material 8 is also filled with conductive particles, especially when the conductive strips are glued or not very smooth, to avoid any electrical problems at the interface between the conductive strips and the spiral wire.

The conductive strip is arranged directly on the tube 1 containing the optical fibres and is surrounded by a first extruded sheath 4. In this case, the first extruded sheath 4 may optionally provide electrical insulation between the conductive strip and the conductor.

In a preferred embodiment, the thickness of the conductive strip in the space between the spiral wire 6 and the tube 1 is chosen to obtain a suitable resistance, wherein the first extruded sheath 4 occupies the remaining space.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An anti-interference armored signal cable, which is characterized in that: comprising a tube for providing mechanical strength to the cable and for protecting the optical fiber, said tube containing an optical fiber embedded in a filler material, a helical metal wire having a high mechanical strength, a first extruded jacket disposed between the tube and the helical metal wire, a sealing material in the interstices between the helical metal wire, an outer second jacket for withstanding abrasion around said helical metal wire, the conductive strips constituting an inner conductive means of the cable, said outer second jacket being electrically insulating and having a semiconducting interfacial layer between said helical metal wire and said outer second jacket, said semiconducting interfacial layer filling the outer interstices between said helical metal wires.

2. The tamper-resistant armored signal cable of claim 1, wherein: the conductive strips are arranged on the first extrusion sheath and are welded longitudinally or spirally wound in one or more layers, or are placed along the first extrusion sheath, which itself is extruded directly onto the tube containing the optical fibers.