CN209803411U

CN209803411U - High-strength anti-torsion optical cable

Info

Publication number: CN209803411U
Application number: CN201920380455.9U
Authority: CN
Inventors: 符剑松
Original assignee: Changfei Fiber Optic Cable (shanghai) Co Ltd
Current assignee: Changfei Fiber Optic Cable (shanghai) Co Ltd; Yangtze Optical Fibre and Cable Co Ltd
Priority date: 2019-03-22
Filing date: 2019-03-22
Publication date: 2019-12-17
Anticipated expiration: 2029-03-22

Abstract

The utility model discloses an optical cable is prevented twising reverse by high strength, including fire-retardant oversheath 1 of high elasticity and a plurality of optic fibre unit inlay symmetrically in oversheath 1's the mantle wall and be equipped with two nonmetal aramid reinforcements 2, nonmetal aramid reinforcements 2's surface is provided with sawtooth along axially extended sawtooth line. The utility model discloses a high strength prevents twisting reverse optical cable had both had high strength, can also prevent effectively that the oversheath from producing the phenomenon that contracts back through temperature variation, reduced torsional disadvantage effectively.

Description

High-strength anti-torsion optical cable

Technical Field

The utility model relates to an optical fiber cable especially relates to an optical cable is prevented twising reverse by high strength.

Background

At present, with the rapid development of indoor communication wiring, people continuously put forward new requirements on construction wiring of an indoor access network, and firstly, the outer diameter size of an indoor multi-core optical cable is required to be reduced as much as possible under the condition that the indoor multi-core optical cable meets use conditions; secondly, after the optical cable is fixed indoors according to a designed wiring route, the optical units in the optical cable can be independently extracted to perform splicing and fusion under the condition that the original communication signals can be normally transmitted; moreover, because the indoor space is small, the optical cable is bound to be bent or coiled during wiring, so that the difficulty of extracting the optical unit is increased, potential requirements on the tensile resistance of the optical unit are met, and the flexibility of the sheath is also higher. In order to ensure that the signal transmission of the optical unit is not affected after the inner space of the optical cable is reduced, the retraction of the sheath generated by the sheath at varying temperatures is also considered. Combining the above use conditions and wiring requirements, the combination properties of the conventional optical cable are unsatisfactory.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a high strength anti-twist optical cable that performance is better is provided, both had high strength, can also prevent effectively that the oversheath from producing the phenomenon that contracts through temperature variation, reduces torsional disadvantage effectively.

The utility model discloses a solve above-mentioned technical problem and the technical scheme who adopts is:

The utility model provides an optical cable is prevented turning round by high strength, includes fire-retardant oversheath 1 of high elasticity and a plurality of optic fibre unit inlay symmetrically in the mantle wall of oversheath 1 and be equipped with two nonmetal aramid fiber reinforcements 2, nonmetal aramid fiber reinforcements 2's surface is provided with the sawtooth and follows axial extension's sawtooth line.

Further, the cross-sectional shape of non-metal aramid fiber reinforcement 2 is sector, two sides and the long arc face of non-metal aramid fiber reinforcement 2 are wrapped by outer sheath 1, and the sawtooth lines are arranged on the two sides and the long arc face of non-metal aramid fiber reinforcement 2.

Furthermore, a water-absorbing talcum powder filler 6 is arranged between the high-elasticity flame-retardant outer sheath 1 and the optical fiber units. Thus, the removable optical cable with high strength and excellent torsion resistance can be obtained.

Furthermore, the optical fiber unit comprises a reinforced optical fiber 5, a flexible high-modulus aramid fiber 4 and a high-elasticity flame-retardant polyolefin sheath 3 which are sequentially arranged from inside to outside.

Further, the reinforced optical fiber 5 is a super-bend loss insensitive optical fiber.

Further, the diameter of the reinforced optical fiber 5 is 350 μm, the outer diameter of the high-elasticity flame-retardant polyolefin sheath 3 is 0.9mm, the thickness of the high-elasticity flame-retardant polyolefin sheath is 0.12mm, the overall outer diameter of the optical cable is 4.0mm, and the wall thickness of the optical cable is 0.5 mm.

The high-strength anti-twisting optical cable is skillfully embedded with two non-metal aramid fiber reinforcements symmetrically in the outer sheath, and the outer surface of the reinforcements is provided with the sawtooth lines, so that the non-metal aramid fiber reinforcements can be firmly meshed with the high-elasticity flame-retardant outer sheath, and the phenomenon that the outer sheath retracts due to temperature change is effectively prevented; because the reinforcing effect of the nonmetal aramid fiber reinforcing piece and the sawtooth patterns with large surface area enable the reinforcing piece and the outer sheath not to be displaced mutually, the defect of twisting of the optical cable is effectively reduced.

The geometric structure of the reinforcing part with the sector-shaped cross section determines that the strength and the stability of the reinforcing part are optimal, and the meshing effect formed by the sawtooth patterns of the three surfaces is firmest. And because the oversheath only wraps up three faces of reinforcement, the oversheath only need consider the outside of the long arcwall face of reinforcement and reserve sufficient safe wall thickness just can, so the utility model discloses a high strength prevents twisting optical cable just can make the oversheath thinner.

When the water-absorbing talcum powder filling agent is arranged between the high-elasticity flame-retardant outer sheath and the optical fiber units, the optical cable can more smoothly extract and separate the optical units, so that the optical units in the optical cable can be more conveniently and independently extracted and subjected to splicing and welding in actual construction.

The utility model discloses high strength prevents twisting reverse optical cable compares with prior art, has the advantage as follows:

(1) Because the optical fiber ribbon adopts the super-Bei bending loss insensitive optical fiber, and then the optical fiber ultraviolet ray cures a layer of polypropylene resin to the diameter of 350 μm, the performance of the accessed optical fiber is greatly improved, and the optical fiber ribbon has positive effects on the bending loss and the lateral pressure resistance of the whole optical cable.

(2) The ultra-fine flexible high-modulus synthetic fiber is wrapped to enable the tensile resistance of the optical unit to be very excellent, and a layer of thin-skin high-elasticity polyolefin material enables the optical unit to be small in structural size, can meet the requirement of tensile force to be borne when the optical unit is extracted from the sheath, and can have a small bending radius of the optical cable.

(3) Filling the hydrotalcite powder that inhales between the gap of light unit not only can reduce the frictional force of light unit in the extraction process, reduces the pulling force of extraction, guarantees the extraction requirement, still helps whole cable to prevent the fore-and-aft infiltration of water simultaneously, guarantees the water blocking performance of optical cable.

(4) The nonmetal aramid fiber reinforcement adopts the sawtooth surface to be closely adhered with the high-elasticity flame-retardant outer sheath, so that the phenomenon that the outer sheath retracts due to temperature change is effectively prevented, the transmission of optical signals of the internal optical unit is ensured, the problem of wall thickness increase caused by embedding the reinforcement in the sheath is effectively solved, meanwhile, three surfaces of the fan-shaped reinforcement are designed into sawtooth shapes to be adhered with the outer sheath, the adhesion with the outer sheath is effectively improved, the adhesion strength of the fan-shaped reinforcement is ensured, the tensile resistance of the flame-retardant sheath is enhanced, and the small bending diameter can be met. The high-elasticity flame-retardant outer sheath has high-performance flame-retardant performance, and the interior of the optical cable is filled with a large amount of non-metallic materials, so that the space inside the optical cable is small, and air is less, so that the whole cable is lack of oxygen during combustion and is quickly extinguished, and the high-elasticity flame-retardant outer sheath has high flame-retardant performance and can meet the requirement of severe European Union CPR combustion test; the overall outer diameter of the cable is about 4.0mm and the wall thickness is about 0.5 mm.

Drawings

Fig. 1 is the structure schematic diagram of the high-strength torsion-proof optical cable of the present invention.

In the figure:

1. High-elasticity flame-retardant outer sheath 2 and nonmetal aramid fiber reinforcement

3. High-elasticity flame-retardant polyolefin sheath 4, flexible high-modulus aramid fiber

5. reinforced optical fiber 6 and water-absorbing talcum powder filler.

Detailed Description

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

Fig. 1 shows a high-strength anti-torsion optical cable, which comprises a high-elasticity flame-retardant outer sheath 1 and a plurality of optical fiber units, wherein two nonmetal aramid reinforcements 2 are symmetrically embedded in the wall of the outer sheath 1.

The cross-sectional shape of non-metal aramid fiber reinforcement 2 is fan-shaped, oversheath 1 wraps two sides and the long arc face of non-metal aramid fiber reinforcement 2, and all be provided with on two sides and the long arc face of non-metal aramid fiber reinforcement 2 sawtooth line.

Of course, the non-metal aramid fiber reinforcement 2 may also adopt other conventional cross-sectional forms, be completely wrapped by the outer sheath 1, or be partially wrapped by the outer sheath 1, as long as all or part of the outer surface thereof is provided with sawtooth lines with sawteeth extending along the axial direction, so that the reinforcement 2 can be effectively meshed with the outer sheath 1.

And a water-absorbing talcum powder filler 6 is arranged between the high-elasticity flame-retardant outer sheath 1 and the optical fiber units, so that the optical cable can more smoothly extract and separate the optical units, and the extractable optical cable with high strength and excellent anti-torsion performance is obtained, wherein the water-absorbing talcum powder filler 6 is formed by mixing a super water-absorbing polymer and ultrafine-particle talcum powder. Of course, other conventional filling structure forms can be adopted between the outer sheath 1 and the optical fiber units, and the high-strength anti-torsion optical cable with excellent performance can be obtained as long as the non-metal aramid fiber reinforcing member 2 is arranged according to the structure form.

The optical fiber unit comprises a reinforced optical fiber 5, a flexible high-modulus aramid fiber 4 and a high-elasticity flame-retardant polyolefin sheath 3 which are sequentially arranged from inside to outside, wherein the reinforced optical fiber 5 is a super-Bei bending loss insensitive optical fiber.

The diameter of the reinforced optical fiber 5 is 350 micrometers, the outer diameter of the high-elasticity flame-retardant polyolefin sheath 3 is 0.9mm, the thickness of the high-elasticity flame-retardant polyolefin sheath is 0.12mm, the overall outer diameter of the optical cable is 4.0mm, and the wall thickness of the optical cable is 0.5 mm.

Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A high-strength anti-torsion optical cable comprises a high-elasticity flame-retardant outer sheath (1) and a plurality of optical fiber units, and is characterized in that: the outer sheath is characterized in that two nonmetal aramid fiber reinforcing pieces (2) are symmetrically embedded in the wall of the outer sheath (1), and sawtooth patterns extending along the axial direction are arranged on the outer surface of each nonmetal aramid fiber reinforcing piece (2).

2. The high strength twist resistant optical cable of claim 1 wherein: the cross-sectional shape of non-metal aramid fiber reinforcement (2) is sector, oversheath (1) parcel two sides and long arcwall face of non-metal aramid fiber reinforcement (2), and all be provided with on two sides and the long arcwall face of non-metal aramid fiber reinforcement (2) sawtooth line.

3. A high strength twist-resistant optical cable as claimed in claim 1 or 2, wherein: and a water-absorbing talcum powder filler (6) is arranged between the high-elasticity flame-retardant outer sheath (1) and the optical fiber units.

4. A high strength twist resistant optical cable as claimed in claim 3, wherein: the optical fiber unit comprises a reinforced optical fiber (5), a flexible high-modulus aramid fiber (4) and a high-elasticity flame-retardant polyolefin sheath (3) which are sequentially arranged from inside to outside.

5. the high strength twist resistant optical cable of claim 4 wherein: the reinforced optical fiber (5) is an ultra-Bei bending loss insensitive optical fiber.

6. The high strength twist resistant optical cable of claim 4 wherein: the diameter of the reinforced optical fiber (5) is 350 mu m, the outer diameter of the high-elasticity flame-retardant polyolefin sheath (3) is 0.9mm, and the thickness of the high-elasticity flame-retardant polyolefin sheath is 0.12 mm.

7. The high strength twist resistant optical cable of claim 6 wherein: the overall outer diameter of the optical cable is 4.0mm, and the wall thickness of the optical cable is 0.5 mm.