CN211086722U

CN211086722U - Air-blowing micro cable

Info

Publication number: CN211086722U
Application number: CN201922500358.1U
Authority: CN
Inventors: 沈冰冰; 缪小明; 李新建; 谭枫
Original assignee: Jiangsu Zhongtian Technology Co Ltd
Current assignee: Jiangsu Zhongtian Technology Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-07-24
Anticipated expiration: 2029-12-31

Abstract

The utility model provides an air-blowing micro cable, includes central reinforcement, optical fiber unit and sheath, the optical fiber unit transposition in central reinforcement week side, the sheath cladding in outside the optical fiber unit, the optical fiber unit includes flexible tube, optic fibre and the oleamen that blocks water fill in the flexible tube, air-blowing micro cable still includes dry-type water-blocking object and low friction layer, dry-type water-blocking object fill in the optical fiber unit with in the transposition clearance of central reinforcement, the low friction layer cladding in sheath week side. The air-blowing micro cable is convenient to lay.

Description

Air-blowing micro cable

Technical Field

The utility model relates to a communication optical cable field especially relates to an air-blowing micro cable.

Background

The air-blowing micro cable is generally used for communication lines under the condition of urban pipeline resource shortage and has the characteristics of high optical fiber density and quick air-blowing laying. Along with the continuous development of communication technology, the environment of laying the air-blowing micro cable is gradually developed into building indoor air-blowing by urban pipelines and laid, and the air-blowing micro cable is required to have certain flexibility in the environment, so that the installation requirement of indoor pipelines with smaller bending radius is met. The existing air-blowing micro cable generally adopts engineering plastics such as polybutylene terephthalate and the like as an optical fiber secondary protection material, the hardness of the material is higher, and the produced loose tube cannot reach smaller bending radius, so that the use requirement under a specific environment is limited. And because the outer layer of the air-blowing micro-cable sheath is higher in hardness due to the loose tube and larger in friction between the sheath of the air-blowing micro-cable and the pipeline during laying, the laying difficulty is higher.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for an air-blown micro-cable that is easy to lay.

The utility model provides an embodiment provides an air-blowing micro cable, including central reinforcement, optical fiber unit and sheath, the optical fiber unit transposition in central reinforcement week side, the sheath cladding in outside the optical fiber unit, the optical fiber unit includes flexible tube, optic fibre and the oleamen that blocks water, optic fibre reaches the oleamen that blocks water fill in the flexible tube, the air-blowing micro cable still includes dry-type water-blocking thing and low friction layer, dry-type water-blocking thing fill in the optical fiber unit with in the transposition clearance of central reinforcement, the low friction layer cladding in sheath week side.

Further, the minimum bending diameter of the optical fiber unit is less than or equal to 10 mm.

Furthermore, the deviation of the outer diameter of the optical fiber unit is less than or equal to 0.03 mm.

Furthermore, the friction coefficient between the low-friction layer and the laying pipeline is less than or equal to 0.1.

Further, the optical fiber is an insensitive optical fiber.

Further, the peripheral side of the low friction layer is a smooth circumferential surface.

Furthermore, the periphery of the low friction layer is provided with periodically arranged bulges, and the bulges are arranged along the axial direction of the central reinforcing piece.

Further, the cross section of the protrusion is arc-shaped or trapezoid.

Further, the low friction layer and the sheath are of an integrally formed structure.

Furthermore, the dry-type water-blocking object is water-blocking yarn, the expansion rate of the water-blocking yarn is more than or equal to 20ml/g/min, and the expansion rate of the water-blocking yarn is more than or equal to 100 ml/g.

In the air-blowing micro cable, the optical fiber unit adopts the flexible pipe, so that the optical fiber unit has excellent bending performance, the installation requirement of indoor pipelines with smaller bending radius is met, and the low friction layer is coated on the periphery of the sheath, so that the friction force between the air-blowing micro cable and the pipe wall of the laying pipeline is reduced, and the laying is facilitated.

Drawings

Fig. 1 is a schematic structural view of an air-blowing micro cable according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of an air-blown micro cable according to another embodiment of the present invention.

Description of the main elements

The following detailed description of the invention will be further described in conjunction with the above-identified drawings.

Detailed Description

In order to make the aforementioned objects, features and advantages of the embodiments of the present invention more clearly understood, the present invention will be described in detail with reference to the accompanying drawings and detailed description. In addition, the features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth to provide a thorough understanding of embodiments of the invention, which are described as part of the invention, rather than as a whole. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the scope protected by the embodiments of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the present invention belong. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments of the invention.

Referring to fig. 1, the air-blown micro-cable 100 includes a central strength member 10, an optical fiber unit 20, a dry water-blocking material 30, a sheath 40, and a low friction layer 50. The optical fiber unit 20 is twisted around the central strength member 10, the dry water-blocking material 30 is filled in a twisted gap between the optical fiber unit 20 and the central strength member 10, the sheath 40 covers the optical fiber unit 20, and the low friction layer 50 is disposed around the sheath 40.

The central reinforcement 10 is disposed at an axial position of the air-blowing micro-cable 100 to reinforce a structural strength of the air-blowing micro-cable 100 and improve a tensile load of the air-blowing micro-cable 100. In one embodiment, the central reinforcement member 10 is a non-metallic reinforced plastic rod made of a non-metallic material. In other embodiments, the central reinforcing member 10 is formed by stranding steel wires or other equivalent reinforcing materials.

The optical fiber unit 20 is twisted around the central strength member 10. Specifically, the optical fiber unit 20 includes a flexible tube 21, an optical fiber 22, and a water-blocking ointment 23. The optical fiber 22 is filled in the flexible tube 21, and the water-blocking ointment 23 is filled in the flexible tube 21 and coats the optical fiber 22. The minimum bending diameter of the optical fiber unit 20 is less than or equal to 10mm, and no bending or whitening phenomenon occurs during bending. In one embodiment, the flexible tube 21 is made of a flexible material to provide the optical fiber unit 20 with excellent bending performance. The elastic modulus of the soft material is less than or equal to 700 MPa. The optical fiber 22 is an insensitive optical fiber for adapting to the bending of the flexible tube 21 without affecting the signal transmission of the optical fiber 22. The cone penetration of the water-blocking ointment 23 at 25 ℃ is more than or equal to 570(1/10mm), so that the longitudinal water-blocking performance of the optical fiber unit is improved, and the outer diameter deviation of the optical fiber unit 20 is less than or equal to 0.03 mm. Compared with the existing loose tube, the optical fiber unit 20 meets the installation requirement of the indoor pipeline with smaller bending radius, so that the laying is convenient. In one embodiment, the number of the optical fiber units 20 is 6.

The dry water blocking material 30 is filled in a gap between the optical fiber unit 20 and the central strength member 10 to improve the water blocking capability of the air-blown micro cable 100. The dry-type water-blocking object 30 is made of a dry-type water-blocking material, and specifically, the dry-type water-blocking object 30 is one of water-blocking yarn, water-blocking powder or other dry-type water-blocking materials. In one embodiment, the dry water-blocking substance 30 is a water-blocking yarn, and the expansion rate of the water-blocking yarn is greater than or equal to 20 ml/g/min; the expansion rate is more than or equal to 100 ml/g; under the water column pressure of 1 meter, the water seepage length after 24 hours is less than or equal to 1 meter.

The optical fiber unit 20 is wound by a binding yarn to form a cable core 25, and the sheath 40 is covered outside the cable core 25 to improve the structural strength of the air-blown micro cable 100. The low friction layer 50 covers the jacket 40. The friction coefficient between the low friction layer 50 and the inner wall of the laying pipeline is less than or equal to 0.1, so that the friction force between the low friction layer 50 and the pipe wall of the laying pipeline is reduced, and the laying is facilitated. In one embodiment, the low friction layer 50 is formed by coating a silicon material on the circumference of the cable core 25, and the outer circumference of the low friction layer 50 is a smooth circumference.

Referring to fig. 2, in other embodiments, the low friction layer 50 is made of a silicon material. The low friction layer 50 is provided with projections 51 arranged periodically on the peripheral side thereof, and the projections 51 are arranged along the axial direction of the center reinforcing member 10. The cross section of the protrusion 51 is arc-shaped or trapezoid. The protrusions 51 reduce the friction area between the low friction layer 50 and the pipe wall of the laying pipe during laying, further reduce the friction force between the low friction layer 50 and the pipe wall of the laying pipe, enable the surface of the air-blown micro cable 100 to be easily subjected to uniform drag force due to high-speed airflow in the air-blown laying process, and improve the air-blown laying performance of the air-blown micro cable 100 so as to facilitate laying.

It will be appreciated that the low friction layer 50 is an integral structure of the same material as the jacket 40. Specifically, in one embodiment, the low friction layer 50 and the sheath 40 are both made of a polyethylene material or a nylon sheath material with a low friction coefficient, so that the friction coefficient between the low friction layer 50 and the laying pipeline is less than or equal to 0.1.

In the air-blown micro-cable 100, the optical fiber unit 20 employs the flexible tube 21 and the insensitive optical fiber 22, so that the optical fiber unit 20 has excellent bending performance. The water-blocking ointment 23 is filled in the flexible tube 21, so that the deviation of the outer diameter of the optical fiber unit 20 is less than or equal to 0.03 mm. The minimum bending diameter of the optical fiber unit 20 is less than or equal to 10mm, and the optical fiber unit is not bent or whitened during bending, so that the installation requirement of the indoor pipeline with smaller bending radius is met, and the laying is facilitated. The low friction layer 50 covers the jacket 40. The friction coefficient between the low friction layer 50 and the laying pipeline is less than or equal to 0.1, so that the friction force between the low friction layer 50 and the wall of the laying pipeline is reduced, the laying is facilitated, and the air blowing performance is ensured.

The above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention and are not limited, and although the embodiments of the present invention have been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions to the technical solutions of the embodiments of the present invention may be made without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides an air-blowing micro cable, includes central reinforcement, optical fiber unit and sheath, the optical fiber unit transposition in central reinforcement week side, the sheath cladding in outside the optical fiber unit, its characterized in that: the optical fiber unit comprises a flexible pipe, an optical fiber and water-blocking ointment, the optical fiber and the water-blocking ointment are filled in the flexible pipe, the air-blowing micro cable further comprises a dry water-blocking object and a low-friction layer, the dry water-blocking object is filled in a twisting gap between the optical fiber unit and the central reinforcing piece, and the low-friction layer is coated on the periphery of the sheath.

2. The air-blown micro-cable of claim 1, wherein: the minimum bending diameter of the optical fiber unit is less than or equal to 10 mm.

3. The air-blown micro-cable of claim 1, wherein: the deviation of the outer diameter of the optical fiber unit is less than or equal to 0.03 mm.

4. The air-blown micro-cable of claim 1, wherein: the friction coefficient between the low-friction layer and the laying pipeline is less than or equal to 0.1.

5. The air-blown micro-cable of claim 1, wherein: the optical fiber is an insensitive optical fiber.

6. The air-blown micro-cable of claim 1, wherein: the peripheral side of the low friction layer is a smooth peripheral surface.

7. The air-blown micro-cable of claim 1, wherein: the periphery of the low friction layer is provided with periodically arranged bulges, and the bulges are arranged along the axis direction of the central reinforcement.

8. The air-blown micro-cable of claim 7, wherein: the cross section of the bulge is arc-shaped or trapezoidal.

9. The air-blown micro-cable of claim 1, wherein: the low friction layer and the sheath are of an integrally formed structure.

10. The air-blown micro-cable of claim 1, wherein: the dry type water-blocking object is water-blocking yarn, the expansion rate of the water-blocking yarn is more than or equal to 20ml/g/min, and the expansion rate is more than or equal to 100 ml/g.