CN209895042U

CN209895042U - Optical cable

Info

Publication number: CN209895042U
Application number: CN201920438427.8U
Authority: CN
Inventors: 赵现伟; 史烨婷; 章海翔; 鲁鸽; 赵蕾
Original assignee: Fortis Special Optical Fiber Cable (tianjin) Co Ltd
Current assignee: Fortis Special Optical Fiber Cable (tianjin) Co Ltd
Priority date: 2019-04-02
Filing date: 2019-04-02
Publication date: 2020-01-03
Anticipated expiration: 2029-04-02

Abstract

The utility model provides an optical cable, include: the cable comprises a cable core part and a cable core part, wherein the cable core part comprises a plurality of bundle pipes, the bundle pipes are twisted together at a certain pitch by taking a water-blocking rope as a center, each bundle pipe comprises a plurality of optical fibers and sleeves coated on the peripheries of the optical fibers, and a water-blocking tape and an FRP tape are sequentially coated on the peripheries of the bundle pipes; a sheath including a second sheath covering a periphery of the cable core; and the two second reinforcing parts are respectively positioned in the second protecting layers on the two sides of the cable core. The optical cable is free of any metal element, the outer diameter of the beam tube is reduced, the weight of the optical cable is reduced, and the density of the optical fibers of the cable core is improved; a plurality of bundle tubes are stranded around the water blocking rope, and water blocking yarns are arranged between the bundle tubes to ensure the water blocking effect in the middle of the cable core; after the plurality of bundle pipes are twisted, the water blocking tape is wrapped or longitudinally wrapped, so that the water blocking performance between the cable core and the protective layer is guaranteed; the FRP belt and the aramid yarn can increase the tensile property and the bending resistance of the optical cable, and simultaneously ensure that the optical cable has better flexibility.

Description

Optical cable

Technical Field

The utility model relates to an optical communication technical field, specifically speaking relates to an optical cable.

Background

The optical cable can be divided into according to the cable core structure: central tube type optical cable, layer stranded optical cable and skeleton type optical cable. The central tube type optical cable is simple in structure, simple in manufacturing process, small in sectional area and light in weight, but the structure of a single beam tube of the existing central tube type structure limits the improvement of the core number of the central tube type optical cable to a great extent. If the central tube type of a single bundle tube adopts a loose fiber structure, the maximum number of the cores is 24 at present, and most of the cores are concentrated in 6 cores and 12 cores. If the optical fiber band structure is adopted, the manufacturing cost and the construction cost are increased, meanwhile, the number of the cores is relatively large, and a single beam tube is mostly concentrated on 96 cores, 144 cores, 216 cores, 288 cores and the like, so that the weight of the optical cable is increased.

With the development of FTTx, the large-scale development of optical cable laying engineering for 5G applications has increased the demand of optical cables, and the demand of application environment and core number has become more and more diversified. Due to the good supporting performance of the suspension wires of the 8-shaped optical cable, the self weight of the optical cable is born to a great extent, the influence of long-term tension on the optical cable is very limited, and the cable core in the body is well protected. The method is applied to overhead optical cables. In order to ensure that the 8-shaped cable has sufficient long-term tensile property, the suspension wire of the 8-shaped cable is mainly made of steel stranded wires. Meanwhile, the body part is mostly longitudinally wrapped by a metal belt, so that the weight of the 8-shaped optical cable is increased to a great extent, and more inconvenience is brought to overhead operation. In addition, in the areas with much thunder and nearby high-voltage cables, the overhead 8-shaped cable is easily damaged by lightning or influenced by the magnetic field of the high-voltage transmission cable, and the service life of the optical cable is shortened.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model provides an optical cable, include: the cable comprises a cable core part and a cable core part, wherein the cable core part comprises a plurality of bundle pipes, the bundle pipes are twisted together at a certain pitch by taking a water-blocking rope as a center, each bundle pipe comprises a plurality of optical fibers and sleeves coated on the peripheries of the optical fibers, and a water-blocking tape and an FRP tape are sequentially coated on the peripheries of the bundle pipes; a sheath including a second sheath covering a periphery of the cable core; and the two second reinforcing parts are respectively positioned in the second protecting layers on the two sides of the cable core.

Preferably, still have and suspend in midair the portion, suspend in midair the portion including the first reinforcement that is located cable core portion top, the sheath still includes the cladding at the first peripheral first sheath of reinforcement, and the one end that first sheath and second sheath are close to each other is connected as an organic whole.

Preferably, a water blocking yarn is further disposed between the bundle tubes.

Preferably, a plurality of aramid yarns are wound on the periphery of the FRP belt.

Preferably, the periphery of the optical fibers is further wound with water blocking yarns, so that the optical fibers are gathered into a cylindrical shape.

Preferably, the ferrule is a curable resin disposed at regular intervals along the length direction of the optical fiber, or a continuous tubular substance extruded.

Preferably, two horizontally parallel third reinforcing members are further arranged in the first protective layer, and the two third reinforcing members are respectively positioned on two sides of the first reinforcing member in the horizontal direction.

Preferably, the first reinforcing member, the second reinforcing member and the third reinforcing member are all made of FRP materials.

The utility model has the advantages that:

(1) the optical cable is free of any metal element, and the optical fibers in the bundle tube are wound by the water-blocking yarns, so that the water-blocking effect in the sleeve tube is guaranteed, the outer diameter of the bundle tube is reduced, the overall outer diameter of the optical cable is reduced, the weight of the optical cable is reduced, and the fiber density of the cable core is improved;

(2) a plurality of bundle tubes are stranded around the water blocking rope, and water blocking yarns are arranged between the bundle tubes to ensure the water blocking effect in the middle of the cable core;

(3) after the plurality of bundle pipes are twisted, the water blocking tape is wrapped or longitudinally wrapped, so that the water blocking performance between the cable core and the protective layer is guaranteed;

(4) the FRP belt and the aramid yarn can increase the tensile and bending resistance of the optical cable and ensure the optical cable to have better flexibility;

(5) the second reinforcer of FRP material is adopted to cable core both sides, suspends the third reinforcer that the portion both sides adopted the FRP material in midair, promotes the anti bending performance of optical cable.

Drawings

The above features and technical advantages of the present invention will become more apparent and readily appreciated from the following description of the embodiments thereof, taken in conjunction with the accompanying drawings.

Fig. 1 is a cross-sectional view showing an optical cable according to a first embodiment of the present invention;

FIG. 2 is a cross-sectional view of a fiber optic cable illustrating a second embodiment of the present invention;

fig. 3 is a cross-sectional view showing a fiber optic cable according to a third embodiment of the present invention.

Detailed Description

Embodiments of the optical cable according to the present invention will be described below with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, or combinations thereof, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts.

First embodiment

The optical cable of the embodiment includes a cable core and a sheath, wherein the cable core includes a plurality of bundle tubes 8, the bundle tubes 8 include a plurality of optical fibers 81 and a sleeve 82 covering the optical fibers 81, the plurality of optical fibers 81 are gathered in a cylindrical shape, and the sleeve 82 is covered on the outer periphery of the optical fibers 81. The bundle tube 8 is a dry bundle tube, and the dry bundle tube means that the sleeve tube 8 is not filled with ointment. The ferrule 82 may be formed of a curable resin curable by ultraviolet light, and the cylindrical gathered optical fibers 81 may be drawn at a predetermined speed, the curable resin may be uniformly applied to the outer peripheries of the optical fibers along the longitudinal direction of the optical fibers 81, and the applied curable resin may be irradiated with ultraviolet light to be cured, thereby forming a resin fixing portion covering the optical fibers. Alternatively, the sleeve 82 may be formed by extrusion.

A plurality of bundle pipes 8 are formed by adopting the structure, the bundle pipes 8 surround the periphery of the water blocking rope 7, and the bundle pipes 8 are twisted together at a certain pitch. The number of the bundle tubes 8 which are optimally twisted in the cable core structure is three, so that the core density of the optical fiber 81 is the maximum under the condition of the same bundle tube core number while the structure is compact. The blank between the fiber cores of the existing central tube type loose fibers and the fiber ribbon is filled, and the blank is concentrated above 24 cores and below 72 cores. And longitudinally wrapping or wrapping the water-blocking tape 5 at the periphery of the bundle pipe 8, wherein the wrapping can be that the water-blocking tape is wrapped at the periphery of the bundle pipe 8 in a spiral winding lap joint mode, so that the outer side of the wound water-blocking tape 5 is lapped with the inner side of the newly wound water-blocking tape 5. The longitudinal wrapping is that the water-blocking tape 5 is wrapped on the periphery of the bundle pipe 8 along the longitudinal extension of the bundle pipe. The water-blocking tape 5 is used for ensuring the water-blocking performance between the cable core and the protective layer 9.

The periphery of the water blocking tape 5 is coated with an FRP (composite material, which is a high-performance material formed by mixing fiber material and resin according to a certain proportion) tape 4, so that the tensile property and the bending resistance of the optical cable can be improved, and the optical cable is ensured to have better flexibility.

The sheath 9 comprises a second sheath 92 coated on the periphery of the cable core part, two second reinforcing pieces 921 are further arranged in the second sheath 92, the two second reinforcing pieces 921 are respectively located on two sides of the cable core, the bending resistance of the optical cable is guaranteed, and the second reinforcing pieces 921 can also be made of FRP materials.

In addition, preferably, a water blocking yarn can be arranged between the bundle tubes 8, so that the water blocking performance of the cable core is guaranteed.

In addition, preferably, a plurality of aramid yarns 10 can be further wound on the periphery of the FRP belt 4 (according to the requirement of tensile property, an appropriate number of aramid yarns are wound around the FRP belt), so that the tensile property and the bending resistance of the optical cable are mainly improved, and the optical cable is ensured to have better flexibility.

In addition, preferably, the optical fibers in each bundle tube 8 can also form a cylindrical set by winding the water blocking yarns 6, so that the water blocking effect in the sleeve 82 can be guaranteed, the outer diameter of the bundle tube 8 can be reduced, the overall outer diameter of the optical cable can be reduced, the weight of the optical cable can be reduced, and the fiber density of the cable core can be improved.

The resin fixing portions are provided at predetermined intervals along the longitudinal direction of the optical fiber 81, and the plurality of optical fibers are embedded therein. This has the advantage that the weight of the bundle tube 8 can be reduced, thereby further reducing the weight and manufacturing cost of the entire optical cable, and that the connection of the optical fibers can be easily performed even from a portion where the resin fixing portion is not formed.

Second embodiment

The second embodiment has basically the same structure as the first embodiment, and the same contents as the first embodiment will not be described here, and only the technical features different from the first embodiment will be described.

The second embodiment is to add a suspension part on the basis of the first embodiment, the suspension part includes a first reinforcing member 1 located above the cable core part, and the sheath 9 further includes a first sheath 91 covering the periphery of the first reinforcing member 1. And the ends of the first sheath 91 and the second sheath 92 close to each other are integrally connected by the neck 2. Preferably, the first reinforcement member 1 is made of FRP material.

Third embodiment

The third embodiment has basically the same structure as the second embodiment, and the same contents as the second embodiment will not be described here, and only the technical features different from the second embodiment will be described.

On the basis of the second embodiment, two horizontally parallel third reinforcing members 911 are further disposed in the first sheath 91, the two third reinforcing members 911 are respectively located at two sides of the cable core in the horizontal direction, so as to ensure the bending resistance of the optical cable, and the third reinforcing members 911 may also be made of an FRP material.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical cable, comprising:

the cable comprises a cable core part and a cable core part, wherein the cable core part comprises a plurality of bundle pipes, the bundle pipes are twisted together at a certain pitch by taking a water-blocking rope as a center, each bundle pipe comprises a plurality of optical fibers and sleeves coated on the peripheries of the optical fibers, and a water-blocking tape and an FRP tape are sequentially coated on the peripheries of the bundle pipes;

a sheath including a second sheath covering a periphery of the cable core;

and the two second reinforcing parts are respectively positioned in the second protecting layers on the two sides of the cable core.

2. The optical cable of claim 1, wherein:

the cable core part comprises a cable core part and a cable sheath part, wherein the cable core part comprises a first reinforcing part and a second reinforcing part, the first reinforcing part is positioned above the cable core part, the cable sheath part further comprises a first sheath layer coated on the periphery of the first reinforcing part, and one ends, close to each other, of the first sheath layer and the second sheath layer are connected into a whole.

3. The optical cable of claim 1, wherein:

and water-blocking yarns are arranged among the bundle tubes.

4. The optical cable of claim 1, wherein:

and a plurality of aramid yarns are wound on the periphery of the FRP belt.

5. The optical cable of claim 1, wherein:

and water blocking yarns are wound on the peripheries of the optical fibers, so that the optical fibers are assembled into a cylinder.

6. The optical cable of claim 1, wherein:

the ferrule is a curable resin disposed at regular intervals along the length of the optical fiber, or a continuous tubular substance extruded.

7. The optical cable of claim 2, wherein:

two horizontally parallel third reinforcing parts are further arranged in the first protective layer, and the two third reinforcing parts are respectively positioned on two sides of the first reinforcing part in the horizontal direction.

8. The optical cable of claim 2, wherein: the first reinforcing piece and the second reinforcing piece are both made of FRP materials.