CN215181093U

CN215181093U - Corrugated central tube type air-blowing miniature optical cable

Info

Publication number: CN215181093U
Application number: CN202121390064.9U
Authority: CN
Inventors: 李斯新; 赵秋香; 蔡兴; 黄洁
Original assignee: Sichuan Huiyuan Optical Communications Co Ltd
Current assignee: Sichuan Huiyuan Optical Communications Co Ltd
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2021-12-14
Anticipated expiration: 2031-06-22

Abstract

The utility model discloses a corrugated central tube type air-blowing micro optical cable, which comprises an optical fiber unit, fiber paste, a composite loose tube, a tearing rope and an outer sheath; the optical fiber units are distributed in the composite loose sleeve, and fiber paste is injected into the composite loose sleeve and distributed around the optical fiber units; the outer sheath is wrapped outside the composite loose tube; the tear cord is disposed between the composite loose tube and the outer sheath. The utility model discloses a compound sleeve pipe can strengthen the stretching resistance of optical cable and reduce the sleeve pipe and return and contract to the oversheath adopts the corrugate, and the effective optical cable that promotes when the air-blowing advances, and reduce with the friction of pipeline inner wall, promote the air-blowing speed and the air-blowing distance of optical cable, the sheath corrugate has good bending property, can be used to turn more pipeline route construction, and the hand wearing performance is also better simultaneously.

Description

Corrugated central tube type air-blowing miniature optical cable

Technical Field

The utility model relates to a communication optical cable field especially relates to a miniature optical cable of corrugate central tube formula air-blast.

Background

The air-blown micro optical cable is laid in the micro tube by utilizing the pushing force of the air-blowing machine and the suspension force and the dragging force of the compressed air, and the air-blown micro optical cable quickly occupies the market by virtue of the advantages of small cable diameter, light weight, high fiber capacity density, easiness in bending during air-blown laying, convenience in operation, wide application range and the like. With the rapid growth of data communication services, how to improve the fiber holding density of the air-blowing micro optical cable and the larger blowing distance and the air-blowing speed become new market demands.

The loose tube is an important structure in an optical cable structure, a common loose tube material is PBT or PC, the PBT has good mechanical property, excellent axial tension resistance, radial side pressure resistance and impact resistance, and is widely applied to various optical cable structures, but for a central tube type structure of an air-blown micro optical cable, the shrinkage rate and the surplus length of the central tube type structure have important influence, and the PBT loose tube has inevitable defects; the shrinkage rate of the loose tube made of the PC material is low, the rigidity is good, but the loose tube is easy to crack under stress, the loose tube is easy to break during construction, and the hidden quality danger exists. The material of the loose tube therefore limits the development of the central tube type air-blown micro-cable. The PC and PBT are co-extruded to produce the loose tube, so that the loose tube has good environmental and mechanical properties.

The optical cable oversheath generally adopts the higher HDPE of hardness, and the surface is smooth, is applicable to the air-blowing, but to the more pipeline route of turning, the optical cable hardness can influence the effect of turning, and the sheath adopts the corrugate, increases optical cable bending property, and the flute of corrugate increases air-blowing air drag power simultaneously, is favorable to the air-blowing.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a miniature optical cable of corrugate central tube formula air-blast.

The purpose of the utility model is realized through the following technical scheme:

a corrugated central tube type air-blowing miniature optical cable comprises an optical fiber unit, fiber paste, a composite loose tube, a tearing rope and an outer sheath; the optical fiber units are distributed in the composite loose sleeve, and fiber paste is injected into the composite loose sleeve and distributed around the optical fiber units; the outer sheath is wrapped outside the composite loose tube; the tear cord is disposed between the composite loose tube and the outer sheath.

The composite loose tube is formed by co-extruding modified polycarbonate and polybutylene terephthalate, and the thickness of the modified polycarbonate sheath is 0.2-1.0 mm; the thickness of the polybutylene terephthalate sheath is 0.1-0.2 mm.

The outer jacket is corrugated.

The optical fiber unit includes a plurality of coated optical fibers, and the number of the coated optical fibers is 2 to 48.

The tearing rope is made of aramid yarns.

The outer sheath is made of high-density polyethylene or polyamide, and the thickness of the outer sheath is 0.5-1.0 mm.

The utility model has the advantages that:

the utility model discloses a compound sleeve pipe can strengthen the stretching resistance of optical cable and reduce the sleeve pipe and return and contract to the oversheath adopts the corrugate, and the effective optical cable that promotes when the air-blowing advances, and reduce with the friction of pipeline inner wall, promote the air-blowing speed and the air-blowing distance of optical cable, the sheath corrugate has good bending property, can be used to turn more pipeline route construction, and the hand wearing performance is also better simultaneously.

Drawings

FIG. 1 is a view showing the structure of the apparatus of the present invention;

in the drawings: 1-optical fiber unit, 2-fiber paste, 3-composite loose sheath, 4-tearing rope and 5-outer sheath.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

In this embodiment, as shown in fig. 1, a corrugated central tube type air-blown micro optical cable includes an optical fiber unit, a fiber paste, a composite loose tube, a tear rope, and an outer sheath; the optical fiber units are distributed in the composite loose sleeve, and fiber paste is injected into the composite loose sleeve and distributed around the optical fiber units; the outer sheath is wrapped outside the composite loose tube; the tear cord is disposed between the composite loose tube and the outer sheath.

The composite loose tube is formed by co-extruding modified polycarbonate (PC for short) and polybutylene terephthalate (PBT for short), and the thickness of the modified polycarbonate sheath is 0.2-0.5 mm; the thickness of the polybutylene terephthalate sheath is 0.1-0.2 mm.

The outer jacket is corrugated.

The tearing rope is made of aramid yarns.

The outer sheath is made of high-density polyethylene or polyamide, and the thickness of the outer sheath is 0.8-1.0 mm.

The composite loose tube is formed by co-extruding PC and PBT, so that the retraction problem of the optical cable loose tube is solved, and better rigidity is provided. The outer sheath is corrugated, so that the optical cable is effectively pushed to advance when air is blown, the friction between the outer sheath and the inner wall of the pipeline is reduced, and the air blowing speed and the air blowing distance of the optical cable are improved. The corrugated MINI air-blown micro optical cable has the advantages of small outer diameter, large fiber capacity density, low after-shrinkage rate, low excess length and high lateral pressure resistance, is suitable for smaller pipelines, and has long air-blown conveying distance and high air-blown speed.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above, and it should be understood by those skilled in the art that the present invention is not limited by the above embodiments, but only by the description of the above embodiments and the description, without departing from the spirit and scope of the present invention, the present invention can also have various changes and modifications, and these changes and modifications all fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A corrugated central tube type air-blowing miniature optical cable is characterized by comprising an optical fiber unit, fiber paste, a composite loose tube, a tearing rope and an outer sheath; the optical fiber units are distributed in the composite loose sleeve, and fiber paste is injected into the composite loose sleeve and distributed around the optical fiber units; the outer sheath is wrapped outside the composite loose tube; the tear cord is disposed between the composite loose tube and the outer sheath.

2. The micro air-blown optical cable with the corrugated central tube as claimed in claim 1, wherein the composite loose tube is formed by co-extruding modified polycarbonate and polybutylene terephthalate, and the thickness of the modified polycarbonate sheath is 0.2-1.0 mm; the thickness of the polybutylene terephthalate sheath is 0.1-0.2 mm.

3. The corrugated center tube air-blown micro cable of claim 1, wherein the outer jacket is corrugated.

4. The corrugated center tube air-blown micro optical cable as claimed in claim 1, wherein the optical fiber unit comprises a plurality of coated optical fibers, and the number of the coated optical fibers is 2 to 48.

5. The miniature air-blown cable of claim 1, wherein said ripcords are aramid yarns.

6. The corrugated central tube type air-blown micro optical cable as claimed in claim 1, wherein the outer sheath material is high density polyethylene or polyamide, and the thickness of the outer sheath is 0.5mm to 1.0 mm.