CN215769137U - Flame-retardant waterproof optical cable - Google Patents

Abstract

The invention provides a flame-retardant waterproof optical cable which comprises a cable core, and a first waterproof layer, a wrapping layer, a shielding layer, an armor layer, a second waterproof layer and an outer sheath which are sequentially coated on the outer side of the cable core from inside to outside; the cable core comprises an insulator and a plurality of optical fibers embedded in the insulator, and the optical fibers are arranged at intervals. The invention has the advantages of reasonable structural design, stable structure and simple production, saves the procedures of fiber paste filling, plastic sheathing and the like which have complicated manufacturing process and difficult quality control, has no gap between each optical fiber in the cable core and between each protective layer of the cable core, and has excellent transverse water resistance, longitudinal water resistance, flame retardance, tensile strength and bending performance.

Description

Flame-retardant waterproof optical cable

Technical Field

The invention belongs to the technical field of optical cable design and manufacture, and particularly relates to a flame-retardant waterproof optical cable.

Background

With the development of socio-economic, especially the gradual popularization of 4G and 5G technologies in recent years, the mobile communication has been developed, especially the fields of mobile internet, cloud computing, big data, internet of things and the like are started, and the communication optical cable is widely applied. In addition, once water or moisture invades the inside of the optical cable, not only can metal elements be corroded, but also the water peak attenuation of the optical fiber can be caused, so that the failure of an optical fiber cable transmission system is caused, great difficulty is brought to disaster relief work, and greater damage and loss are caused. Accordingly, there is a need for structural improvements to existing fiber optic cables.

Disclosure of Invention

In view of this, the invention provides a flame-retardant waterproof optical cable, which aims to overcome the defects in the prior art.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a flame-retardant waterproof optical cable comprises a cable core, and a first waterproof layer, a wrapping layer, a shielding layer, an armor layer, a second waterproof layer and an outer sheath which are sequentially coated on the outer side of the cable core from inside to outside; the cable core comprises an insulator and a plurality of optical fibers embedded in the insulator, and the optical fibers are arranged at intervals.

Further, the insulator is a tightly compacted polyethylene insulator.

Furthermore, the armor layer adopts corrugated pipes with welded corrugations.

Further, the outer sheath adopts a high flame retardant outer sheath.

Furthermore, the first water-proof layer adopts real silk cotton cloth as base cloth.

Further, the second water-blocking layer is a woven belt layer woven by water-blocking yarns.

Furthermore, the shielding layer is a metal shielding layer.

Further, the wrapping layer is a halogen-free glass fiber tape wrapping layer.

Compared with the prior art, the invention has the following advantages:

the invention has the advantages of reasonable structural design, stable structure and simple production, saves the procedures of fiber paste filling, plastic sheathing and the like which have complicated manufacturing process and difficult quality control, has no gap between each optical fiber in the cable core and between each protective layer of the cable core, and has excellent transverse water resistance, longitudinal water resistance, flame retardance, tensile strength and bending performance.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:

FIG. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of an embodiment of the present invention with support reinforcement;

FIG. 3 is a schematic view of a support stiffener with a recess according to an embodiment of the present invention;

fig. 4 is a schematic view of a grooved support stiffener and its peripheral fiber arrangement in an embodiment of the invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.

A flame-retardant waterproof optical cable comprises a cable core, a first waterproof layer 1, a wrapping layer 2, a shielding layer 3, an armor layer 4, a second waterproof layer 5 and an outer sheath 6, wherein the outer side of the cable core is sequentially wrapped from inside to outside, and generally, the wrapping layer is formed by winding a halogen-free glass fiber tape. The cable core comprises an insulator 8 and a plurality of optical fibers 7 embedded in the insulator, and the optical fibers are arranged at intervals.

For example, the insulator is a tightly compacted polyethylene insulator, no gap exists between optical fibers of the manufactured cable core, the risk of water inlet and fiber breakage of the optical cable is reduced, the structure is stable, the production process is simple, the quality is stable and reliable, the production efficiency is high, the manufacturing cost is low, the armor layer is a corrugated pipe with welded embossing, no gap exists, the performances of flame retardance, water resistance and moisture resistance are good, the structural strength is high, the optical cable is not easy to deform, and the optical cable has high tensile strength and bending performance.

Typically, the outer jacket employs a high flame retardant outer jacket. For example, the halogen-free high-flame-retardant polyolefin sheath is adopted, the outer sheath has high oxygen index and excellent heat insulation and oxygen isolation, no halogen acid gas is emitted during combustion, the release amount of toxic corrosive gas is extremely small, the concentration of generated smoke is low, and the flame retardant property and the processing property are excellent.

The first waterproof layer adopts real silk cotton cloth as base cloth. For example, the first water-resistant layer is formed by using a base fabric of silk cotton cloth, soaking the base fabric with glue solution through a dip-coating curing process, removing the excessive glue solution, drying and then slitting. Because the base cloth of the real silk cotton cloth is a high-temperature resistant material and is soaked with the glue solution, the water absorption is good, the expansion speed is high, the expansion height is large, the water resistance is good, the fire resistance of the optical cable is enhanced, and the service life of the optical cable is prolonged.

The second waterproof layer is a woven tape layer woven from waterproof yarns (made of polyester fabric as a base layer, and expanded microparticles are bonded to the base layer). Generally, the materials of the expanded particles are cellulose, acrylamide and acrylic acid polymer, so that the prepared woven belt has good water resistance and tensile strength, and is soft and flexible.

The shielding layer is a metal shielding layer. For example, the metal shielding layer is formed by welding aluminum strips with embossing and extruding a polyethylene sleeve for one-step forming, so that the prepared metal shielding layer has no gap, good flame retardance, water resistance and moisture resistance, high structural strength and difficult deformation, and the optical cable has high tensile strength and bending performance.

When the cable is manufactured:

a plurality of colored optical fibers sequentially pass through the wire arranging plate and enter a die sleeve of a die core of the plastic extruding machine to be extruded to form an insulator, so that polyethylene is wrapped outside the optical fibers in an insulating mode, the optical fibers are separated, the brand new structure arrangement is adopted, the mutual independence among the optical fibers is guaranteed, and mutual friction is avoided.

And a first waterproof layer and a halogen-free glass fiber tape wrapping layer are wrapped outside the insulator by adopting a wrapping process, and the covering rate is higher than or equal to 20%. The first water-resistant layer is coated outside the insulator, and the halogen-free glass fiber tape is coated outside the first water-resistant layer.

An aluminum tape with the thickness of not less than 0.2mm is coated outside a halogen-free glass fiber tape wrapping layer through a welding embossing process, a polyethylene sleeve with the thickness of 1.8mm is extruded outside the aluminum tape to be formed in one step, a galvanized steel tape with the thickness of not less than 0.2mm is coated outside a metal shielding layer through the welding embossing process, a second water-blocking layer with the overlapping rate higher than or equal to 20% is coated outside the armor layer through the wrapping process, and finally an outer sheath is extruded outside the second water-blocking layer.

In order to further reduce the risk of fiber breakage and improve the tensile and bending resistance of the cable, in an alternative embodiment, as shown in fig. 2, a plurality of reinforcing supports 9 may be embedded in the insulator, with the optical fibers arranged around the reinforcing supports with gaps between the optical fibers.

For example, in the above embodiment, one reinforcing support member may be disposed at the center of the cable core, the remaining reinforcing support members are uniformly distributed at the periphery of the reinforcing support member at the center, and a plurality of optical fibers are uniformly distributed at the periphery of each reinforcing support member. The reinforcing support member can be made of rubber materials, nylon materials or glass fiber materials, and of course, other materials can be selected, so that the tensile property of the optical cable can be improved.

For ease of manufacture and to maintain the structural stability of the optical fibres, as shown in figures 3 and 4, the reinforcing supports are provided with grooves 10 on their outer circumference, said optical fibres being partially embedded in the grooves, i.e. in the grooves on the outer circumference of each reinforcing support, the optical fibres being partially embedded in the grooves or wholly embedded in the grooves, preferably 1/3-2/3 of the cross-section of the optical fibres being embedded in the grooves. The optical fiber and the reinforcing support piece can be extruded as a relatively independent whole body to form an external insulator, the yield is high, the position of the optical fiber is kept more stable, and the protective effect of the reinforcing support piece and the insulator on the optical fiber is better.

The invention has the advantages of reasonable structural design, stable structure and simple production, saves the procedures of fiber paste filling, plastic sheathing and the like which have complicated manufacturing process and difficult quality control, has no gap between each optical fiber in the cable core and between each protective layer of the cable core, and has excellent transverse water resistance, longitudinal water resistance, flame retardance, tensile strength and bending performance. Especially, in the structural design of embedding a plurality of reinforcing support members in the insulator, the tensile property and the bending property of the optical cable are further improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.

Claims (8)

1. A flame-retardant waterproof optical cable is characterized in that: the cable comprises a cable core, and a first waterproof layer, a wrapping layer, a shielding layer, an armor layer, a second waterproof layer and an outer sheath which are sequentially coated on the outer side of the cable core from inside to outside; the cable core comprises an insulator and a plurality of optical fibers embedded in the insulator, and the optical fibers are arranged at intervals.

2. The flame-retardant and waterproof optical cable according to claim 1, wherein: the insulator is a tightly compacted polyethylene insulator.

3. The flame-retardant and waterproof optical cable according to claim 1, wherein: the armor layer is made of corrugated pipes with welded corrugations.

4. The flame-retardant and waterproof optical cable according to claim 1, wherein: the outer sheath is a high flame retardant outer sheath.

5. The flame-retardant and waterproof optical cable according to claim 1, wherein: the first water-proof layer adopts real silk cotton cloth as base cloth.

6. The flame-retardant and waterproof optical cable according to claim 1, wherein: the second water-resistant layer is a woven belt layer woven by water-resistant yarns.

7. The flame-retardant and waterproof optical cable according to claim 1, wherein: the shielding layer is a metal shielding layer.

8. The flame-retardant and waterproof optical cable according to claim 1, wherein: the wrapping layer is a halogen-free glass fiber tape wrapping layer.

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