CN211086711U

CN211086711U - Improved all-dielectric communication optical cable

Info

Publication number: CN211086711U
Application number: CN201922199333.2U
Authority: CN
Inventors: 王秋萍; 陈炳炎; 龚成; 刘成
Original assignee: Jiangxi Changtian Optical Communication Co ltd
Current assignee: Jiangxi Changtian Optical Communication Co ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-07-24
Anticipated expiration: 2029-12-10

Abstract

The utility model relates to an improved all-dielectric communication optical cable, the periphery of an FRP central framework is evenly distributed with optical fiber units; the optical fiber unit comprises a PBT loose tube, wherein optical fibers are arranged in the PBT loose tube and cable paste is injected in the PBT loose tube; the outer side of the optical fiber unit is wrapped with a glass fiber braided belt butt-joint longitudinal cladding, the inner layer of the glass fiber braided belt butt-joint longitudinal cladding is coated with water-blocking cable paste, and the outer layer of the glass fiber braided belt butt-joint longitudinal cladding is wrapped with a low-smoke halogen-free flame-retardant sheath; the butt joint longitudinal cladding layer of the glass fiber woven belt is the glass fiber woven belt, and the glass fiber woven belt is impregnated and cured with polyurethane resin. The utility model discloses owing to glass fiber coincide of interweaving in the meshbelt, form a whole with the braid over braid in addition by the polyurethane resin of flooding, so when the meshbelt bears the pulling force, the even atress of every glass fiber, so the glass fiber braid over braid has extremely strong tensile ability, has improved optical cable quality and performance.

Description

Improved all-dielectric communication optical cable

Technical Field

The utility model relates to an optical fiber cable technique especially relates to a modified all dielectric communication optical cable.

Background

Conventional outdoor telecommunication cables include metal members such as steel wires as tensile members, aluminum or steel tape coated longitudinal cladding as water and pressure resistant members, and the like. But needs to adopt a non-metal communication optical cable structure in many special occasions: for example in power systems, on high voltage power lines, in mine-prone mountainous areas, grassland areas, etc.

In conventional nonmetallic optical communication cables, FRP (fiber reinforced plastic) is used as a tensile member, but the tensile modulus of FRP is 0.5' 10⁵N/mm²Only one quarter of the wire. In many instances, it is not sufficient to withstand the pulling forces required by the cable. If aramid fiber in the ADSS optical cable is used as a tensile element, the cost is high, and the cabling process is complex.

SUMMERY OF THE UTILITY MODEL

The utility model provides a full medium optical cable through adopting nonmetal tensile element, compares with traditional non-metallic communication optical cable and has better tensile ability, compares with ADSS optical cable and has low price's advantage to replace conventional outdoor communication optical cable, be arranged in general communication line.

The purpose of the utility model is realized like this. An improved all-dielectric communication optical cable comprises an FRP central framework, wherein optical fiber units are uniformly distributed on the periphery of the FRP central framework and cable paste is injected; the optical fiber unit comprises a PBT loose tube, wherein optical fibers are arranged in the PBT loose tube and are injected with fiber paste; the outer side of the optical fiber unit is wrapped with a butt joint longitudinal cladding, the inner layer of the butt joint longitudinal cladding is coated with water-blocking paste, and the outer layer of the butt joint longitudinal cladding is wrapped with a sheath; the butt-joint longitudinal cladding layer is a glass fiber woven belt, and polyurethane resin is impregnated and cured on the glass fiber woven belt.

The utility model discloses the glass fiber braid over braid low price of well adoption helps reducing the cost of manufacture of optical cable, simultaneously because the thermosetting polyurethane resin of flooding forms certain thickness and width, and the soft and crooked tensile element that can make vertical cladding. Because the glass fibers are mutually interwoven and overlapped in the woven belt and the woven belt is integrally formed by the impregnated polyurethane resin, when the woven belt bears the tensile force, each glass fiber is uniformly stressed, so the glass fiber woven belt has extremely strong tensile capacity and the quality and the performance of the optical cable are improved.

Drawings

Fig. 1 is a schematic cross-sectional structure of the present invention.

In the figure: 1-FRP central framework, 2-cable paste, 3-optical fiber, 4-fiber paste, 5-PBT loose tube, 6-butt joint longitudinal cladding, 7-water-blocking paste and 8-sheath.

Detailed Description

The present invention will be further explained with reference to the drawings and examples. Referring to fig. 1, an improved all-dielectric communication optical cable comprises an FRP central skeleton 1, optical fiber units 9 uniformly distributed on the periphery of the FRP central skeleton 1 and cable paste 2 injected therein; the optical fiber unit 9 comprises a PBT loose tube 5, and the optical fiber 3 is arranged in the PBT loose tube 5 and is injected with fiber paste 4; the outer side of the optical fiber unit 9 is wrapped with a butt joint longitudinal cladding 6, the inner layer of the butt joint longitudinal cladding 6 is coated with water-blocking paste 7, and the outer layer of the butt joint longitudinal cladding 6 is wrapped with a sheath 8. The butt joint longitudinal cladding layer 6 adopts a glass fiber woven belt, and polyurethane resin is impregnated and cured on the glass fiber woven belt.

Example (b): a preferred embodiment of the present invention will now be described. The structure is as follows: the tensile strength is mainly ensured by the butt joint of the glass fiber woven belt and the longitudinal cladding 6, and the FRP central framework 1 can be used as an auxiliary tensile element. The water-blocking performance is ensured by cable paste 2 coated on the surface of the FRP central framework 1 and water-blocking paste 7 sprayed on the inner surface of the butt joint longitudinal cladding 6. The butt joint longitudinal cladding 6 not only has good tensile strength, but also has the function of preventing rodent damage, and has the same effect as steel wires in the aspect of preventing mice, field immunity (to pipelines and buried optical cables) and birds (to overhead optical cables) from damaging the optical cables.

The utility model discloses a glass fiber braid over braid is as butt joint vertical covering 6, constitutes full medium communication optical cable for optical cable tensile element promptly. The typical structure of the optical cable of the utility model, but not limited to, the size is as follows;

30-core stranded optical cable (structure shown in fig. 1):

serial number	Name of structure	Size of	Material
				1	Central framework	F1.5mm	FRP
2	Coating cable paste
				3	Optical fiber		Single mode or multimode
4	Fiber paste		Thixotropic fiber paste
				5	Loose tube (6 core tube)	5' F1.7mm, wall thickness 0.3mm	PBT
6	Glass fiber braided belt	Width/thickness 16/0.5mm
				7	Spraying cable paste	Water expansion type cable paste
8	Protective sleeve	Outer diameter F12mm	Thermoplastic plastic

The optical cable with the structure can pass a tensile test with long-term/short-term tension of 600N/1500N specified by industry standards.

The utility model discloses an all-dielectric communication optical cable also can regard as ADSS optical cable to use in the electric power communication system of short span. Meanwhile, the glass fiber braided belt is low in price, and the manufacturing cost of the optical cable is favorably reduced. The glass fiber braided belt is processed on a high-speed braiding machine. The warp and weft yarns are all twistless roving yarns, so that the strength is high, the fibers are loose, and the fibers are easily soaked by resin. The process requirements are as follows: the alkali-free or medium-alkali glass fiber material can be used, and the weaving density is 80-90%. Then, the tensile element which has certain thickness and width, is soft and bent and can be used for longitudinal cladding is formed by dipping the tensile element in ultraviolet curing acrylic resin. According to the structural size of the optical cable and the required tensile force, the glass fiber braided belt butt-joint longitudinal cladding 6 with different thicknesses and widths can be designed and manufactured. Because the glass fibers are mutually interwoven and overlapped in the woven belt and the woven belt is integrally formed by the impregnated polyurethane resin, when the woven belt bears the tensile force, each glass fiber is uniformly stressed, and the glass fiber woven belt has strong tensile capacity.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, so as not to limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. An improved all-dielectric communication optical cable comprises an FRP central framework, and is characterized in that optical fiber units are uniformly distributed on the periphery of the FRP central framework and cable paste is injected; the optical fiber unit comprises a PBT loose tube, wherein optical fibers are arranged in the PBT loose tube and are injected with fiber paste; the outer side of the optical fiber unit is wrapped with a butt joint longitudinal cladding, the inner layer of the butt joint longitudinal cladding is coated with water-blocking paste, and the outer layer of the butt joint longitudinal cladding is wrapped with a sheath; the butt-joint longitudinal cladding layer is a glass fiber woven belt, and polyurethane resin is impregnated and cured on the glass fiber woven belt.