CN210323499U

CN210323499U - Full-dry type micro-bundle optical cable

Info

Publication number: CN210323499U
Application number: CN201921442123.5U
Authority: CN
Inventors: 汪趁时; 李新建; 缪威玮; 陆杰; 周华; 李强
Original assignee: Jiangsu Zhongtian Technology Co Ltd
Current assignee: Jiangsu Zhongtian Technology Co Ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-04-14
Anticipated expiration: 2029-08-30

Abstract

The utility model provides a full-dry type microbeam optical cable, which comprises a microcapillary, an outer sheath coated on the periphery of the microcapillary and a plurality of reinforcements embedded in the outer sheath, wherein the microcapillary comprises a plurality of winding and bundling microcapillaries and a plurality of water-blocking yarns, and the plurality of water-blocking yarns are filled in gaps between the winding and bundling microcapillaries; the winding and binding micro-tube comprises a winding and binding belt, a plurality of dry type optical fiber micro-tubes and a plurality of water-blocking yarns, wherein the dry type optical fiber micro-tubes are wrapped by the winding and binding belt, and each dry type optical fiber micro-tube consists of a micro-tube sheath, the water-blocking yarns and optical fibers which are wrapped in the micro-tube sheath. The utility model adopts a full-dry structure, has no grease filling, is environment-friendly and pollution-free, and has high efficiency and rapidness in construction; after several dry optical fiber micro-tubes are wound and bound by adopting the winding and binding belt, the optical fiber density and the space occupation ratio of the optical fibers in the inner cavity of the sheath can be effectively improved; the dry-type water-blocking material has stable performance along with the temperature change, the optical fiber transmission characteristic does not change along with the temperature change, and the performance is stable.

Description

Full-dry type micro-bundle optical cable

Technical Field

The utility model relates to the technical field of optical cables, especially indicate a full-dry microbeam optical cable.

Background

The microbeam optical cable is generally used for urban backbone networks, and is usually laid by outdoor pipelines or overhead laying, so that the water-blocking performance of the optical cable is required specially, and the optical cable must prevent longitudinal water seepage. The main structure of the micro-beam optical cable comprises a micro-beam tube and an outer sheath, wherein at least 1 optical fiber is contained in the micro-beam tube, and at least 1 reinforcing piece is embedded in the outer sheath. In order to meet the requirement of water blocking of the whole section of the optical cable, not only the cavity between the outside of the micro-beam tube and the sheath needs water blocking, but also a water blocking material needs to be filled in the micro-beam tube. Typically, the water-blocking material within the microbeam tube is filled with an ointment comprising at least one liquid which is a silicone oil, a fluorinated oil, or a mixture thereof, and a thickening agent which is silica, bentonite, polytetrafluoroethylene, or a mixture thereof.

Filling with ointments may present the following problems: 1) the ointment mainly contains silicone oil which is a general chemical synthetic product, has low natural degradation capability and is easy to pollute the environment for a long time; 2) in the process of installing and using the optical cable, the factice is troublesome to clean, usually needs to be treated by an organic solvent, is not environment-friendly and has low efficiency; 3) the ointment is contacted with the optical fiber coloring layer, so that the coloring layer is easy to fall off or migrate, is difficult to distinguish and is difficult to connect; 4) when the temperature changes, the viscosity of the ointment changes, and the attenuation of the optical fiber may be high; 5) the contact area of the ointment and the sheath of the micro-beam tube is large, the filling volume of the ointment exceeds 85 percent of the inner diameter of the micro-beam tube, and the phenomenon of sheath leakage can occur for a long time. 6) In the prior art, a plurality of micro-beam tubes are generally directly twisted, and the optical fiber of the product has low density and large outer diameter.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for an improved fully dry microbeamformed optical cable.

The utility model provides a technical scheme does: a full-dry type micro-bundle optical cable comprises a micro-tube core, an outer sheath and a plurality of reinforcing pieces, wherein the outer sheath wraps the periphery of the micro-tube core, the reinforcing pieces are embedded into the outer sheath, the micro-tube core comprises a plurality of winding and binding micro-tubes and a plurality of water-blocking yarns, and the plurality of water-blocking yarns are filled in gaps between the winding and binding micro-tubes; the winding and binding microtubes comprise winding and binding bands, a plurality of dry type optical fiber microtubes and a plurality of water-blocking yarns, the dry type optical fiber microtubes are wrapped by the winding and binding bands, each dry type optical fiber microtube comprises a microtube sheath, the water-blocking yarns and optical fibers, the water-blocking yarns and the optical fibers are wrapped in the microtube sheath, and the optical fiber density in an inner cavity of the optical cable:

wherein: the density unit of the optical fiber is F/mm²(ii) a N is the number of optical fibers; k is a correction coefficient and takes a value of 0.5-1.0 mm; m₁Is the thickness of the winding and binding belt in mm, N₁The number of the winding bands is; n is a radical of₂The number of the water-blocking yarns is equivalent; n is a radical of₃Number of dry optical fiber micro-tubes, D₂The outer diameter of the dry optical fiber micro-tube is in mm.

Furthermore, the density of the optical fibers in the inner cavity of the optical cable is 3.8-10F/mm²。

Furthermore, the equivalent circumferential diameters of a plurality of optical fibers in the dry type optical fiber microtube are less than 90% and more than or equal to 70% of the inner cavity of the microtube sheath, and the water-blocking yarns account for 20% and less of the surface area of the inner cavity of the microtube sheath.

Furthermore, the equivalent circumferential diameters of a plurality of optical fibers in the dry type optical fiber microtube are 70% -80% of the inner cavity of the microtube sheath.

Furthermore, the material of the microtube sheath comprises olefin polymer and inorganic filler, wherein the inorganic filler accounts for 0.1-20% of the total mass of all the components of the microtube sheath; the olefin polymer comprises a first olefin polymer or an ethylene/propylene and other monomer copolymer or other type of polymer, wherein the first olefin polymer comprises one of linear low density polyethylene, poly-4-methyl-1-pentene or an ethylene propylene copolymer; wherein the ethylene/propylene and other monomer copolymer comprises one or more of ethylene-alkyd acid ethylene copolymer, ethylene-methyl acrylate copolymer and ethylene-butyl acrylate copolymer; the inorganic filler comprises hydroxide, hydrated oxide, metal salt or a mixture thereof, or carbon black, silica, kaolin, clay or a mixture thereof; the thickness of the microtubule sheath is 0.1-0.2 mm. Wherein the hydroxide may comprise aluminum hydroxide and magnesium hydroxide, the hydrated oxide may be hydrated aluminum oxide and hydrated magnesium carbonate, and the metal salt may be zinc oxide, calcium carbonate, cobalt oxide, etc.

Furthermore, a coaxially arranged reinforcing layer is further included between the micro-tube core and the outer sheath, and the material of the reinforcing layer comprises any one of aramid fiber, glass fiber yarn or polyester yarn, or the combination of water blocking yarn and one or more of aramid fiber, glass fiber yarn or polyester yarn.

Further, a coaxially arranged water blocking tape is further included between the micro pipe core and the outer sheath, and the water blocking tape is a double-sided water blocking tape.

Furthermore, still include a plurality of tear ropes of embedding in the water blocking tape, the material of tearing the rope is aramid fiber or polyester yarn.

Further, the outer sheath is made of polyolefin material; the density of the reinforcing piece is 2.05-2.15 g/cm³The glass fiber reinforced plastic rod of (1).

Furthermore, the water-blocking yarns arranged in each structural layer of the micro-tube core are water-absorbing fibers, so that no water-blocking powder falls off in the production process of the micro-tube core, and the water-absorbing fibers contain acrylic acid, polyacrylic acid, acrylate or modified substances thereof or mixtures thereof.

Compared with the prior art, the full-dry microbeam optical cable provided by the utility model adopts a full-dry structure, has no grease filling, is environment-friendly and pollution-free, and has high efficiency and rapidness in construction; after several dry optical fiber micro-tubes are wound and bound by adopting the winding and binding belt, the optical fiber density and the space occupation ratio of the optical fibers in the inner cavity of the sheath can be effectively improved; the dry-type water-blocking material has stable performance along with the temperature change, the optical fiber transmission characteristic does not change along with the temperature change, and the performance is stable.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of an easy-to-peel dry optical fiber micro-tube according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a fully-dry micro-bundle optical cable using the micro-tube structure shown in fig. 2.

Fig. 3 is a second cross-sectional view of a fully-dry micro-bundle optical cable using the micro-tube structure shown in fig. 2.

Fig. 4 is a cross-sectional view of a third fully-dry micro-bundle optical cable using the micro-tube structure of fig. 2.

Fig. 5 is a cross-sectional view of a totally-dry micro-bundle optical cable using the micro-tube structure of fig. 2.

Fig. 6 is a cross-sectional view of a full-dry micro-bundle optical cable using the micro-tube structure of fig. 2.

Fig. 7 is a cross-sectional view of a sixth full-dry micro-bundle optical cable using the micro-tube structure of fig. 2.

Description of reference numerals:

microtubule sheath 1

Optical fiber 2

Dry optical fiber micro tube 20

Water-blocking yarn 3

Full dry type micro-beam optical cable 100

Outer sheath 30

Reinforcing member 31

Water-blocking tape 40

Tear cord 41

Reinforcing layer 50

Wrap tie 80

Winding and binding micro-tube 82

Microchip 84

The following detailed description will further describe embodiments of the invention in conjunction with the above-described 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, and the described embodiments are merely some, but not all embodiments of the invention. 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.

Herein, "SZ twisting" means left-right twisting. The twisting direction of twisting is divided into left direction and right direction, the left direction is similar to the S direction, and the right direction is similar to the Z direction.

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 present invention provides an easily stripped dry optical fiber micro-tube 20, which comprises a plurality of optical fibers 2, a plurality of water-blocking yarns 3 and a micro-tube sheath 1, wherein the micro-tube sheath 1 is wrapped outside the plurality of optical fibers 2 and the plurality of water-blocking yarns 3, no filler is filled in the gap between the inner cavity of the micro-tube sheath 1 and the plurality of optical fibers 2 and/or the plurality of water-blocking yarns 3, and the water-blocking yarns occupy 20% or less of the inner cavity space. The coating does not contain factice filling, so that the colored layer is prevented from falling off or moving, the connection is easier to construct, and the coating is environment-friendly and efficient.

The optical fiber 2, typically a single mode optical fiber, has a protective coating on its surface; when a plurality of optical fibers 2 are present in each microtube sheath 1, they can be distinguished by coloring, i.e. colored optical fibers are formed. The diameter of the individual fibers 2 may be nominally 250 μm, 200 μm or 180 μm. The plurality of optical fibers 2 are typically SZ stranded within the microcatheter sheath 1. The equivalent diameter formula of the plurality of optical fibers is as follows: d1.16 xn^1/2X d, where n is the number of fibers and d is the diameter of the colored fiber.

The dry type optical fiber micro-tube 20 comprises at least 1 water-blocking yarn 3, the density of the water-blocking yarn is usually 200-800Denier, the tensile strength is more than or equal to 12N, the elongation at break is more than or equal to 12%, the thermal shrinkage rate is less than or equal to 3.5%, the expansion rate is more than or equal to 25ml/g/min, the expansion rate is more than or equal to 30ml/g, and the water content is less than or equal to 8%. The water-blocking yarn 3 is prepared by curing water-absorbing resin or water-absorbing fiber on a base yarn through a process, and no water-blocking powder falls off in the production process of the optical fiber microtube, wherein the water-absorbing resin and the water-absorbing fiber usually contain acrylic acid, polyacrylic acid, acrylate or modified substances thereof or mixtures thereof, and the modified substances can be acrylic acid graft copolymers such as acrylic acid graft modified polyethylene terephthalate. The water-blocking yarn 3 accounts for 20% and less of the surface area of the inner cavity of the microtube sheath.

The thickness of the microtube sheath 1 in the dry type optical fiber microtube 20 is 0.1-0.2 mm; the material of the microtubule sheath 1 comprises olefin polymer and inorganic filler, wherein the inorganic filler accounts for 0.1-20% of the total mass of all components of the microtubule sheath, the olefin polymer comprises first olefin polymer or ethylene/propylene and other monomer copolymer, and the first olefin polymer comprises one of linear low density polyethylene, poly-4-methyl-1-pentene or ethylene propylene copolymer; wherein the ethylene/propylene and other monomer copolymer comprises one or more of ethylene-alkyd ethylene copolymer, ethylene-methyl acrylate copolymer, and ethylene-butyl acrylate copolymer, and has Shore hardness of H_ALess than or equal to 90, the optical fiber micro-tube sheath 1 can be manually operatedEasily torn off by at least 1 meter. The inorganic filler can be hydroxide, hydrated oxide, metal salt or their mixture, wherein the hydroxide can contain aluminum hydroxide and magnesium hydroxide, the hydrated oxide can be hydrated alumina and hydrated magnesium carbonate, and the metal salt can be zinc oxide, calcium carbonate, cobalt oxide, etc.; the inorganic filler may also be carbon black, silica, kaolin, clay, or the like. The proportion X of the equivalent circumference diameter of the optical fiber to the inner diameter of the microtube sheath is more than or equal to 70% and less than 90%, preferably 70-80%. Wherein the inorganic filler reduces the toughness of the material such that the optical fiber micro-tube sheath can be easily torn off by at least 1 meter without the aid of tools. Meanwhile, the addition of the inorganic filler can reduce the shrinkage of the material, the shrinkage of the material can be regulated and controlled within the proportion range to be less than 3%, the optical fiber micro-tube does not shrink in the joint box, and the stable communication of the optical cable communication line can be ensured.

The present invention is described below by way of example to illustrate the structure and performance of the strippable dry fiber optic micro-tube 20.

Example 1

In this example, the number of optical fiber cores of the easy-to-peel dry optical fiber micro tube 20 is 6, as shown in fig. 1.

Each optical fiber micro-tube 20 is internally provided with 6 optical fibers, the colors of the optical fibers 2 are blue, orange, green, brown, gray and white, the optical fibers adopt G.652D optical fibers, the diameter of a colored optical fiber coating is 250 micrometers +/-15 micrometers, and the optical fibers in the micro-tube adopt SZ twisting.

Each optical fiber micro-tube 20 contains 1 300D water-blocking yarn 3, the linear density of the water-blocking yarn 3 is 30000m/kg, and the performance selection requirement is as follows: the tensile strength is more than or equal to 12N, the elongation at break is more than or equal to 12 percent, the thermal shrinkage is less than or equal to 3.5 percent, the expansion rate is more than or equal to 25ml/g/min, the expansion rate is more than or equal to 30ml/g, and the water content is less than or equal to 8 percent. In this example, the water-absorbing fiber contains acrylate, and the matrix is mainly terylene or chinlon.

The wall thickness of the microtubule sheath 1 is 0.1mm, the microtubule sheath 1 is made of a mixture of linear low density polyethylene, carbon black and silicon dioxide, the mass ratio is 82:10:8, and the density is 1.4-1.5 g/cm³The tensile strength was 12MPa, and the elongation at break was 140%. Shore hardness H of microtube sheath material_AThe optical fiber micro-tube sheath can be easily torn off by 1m by hands, which is 84.

The outer diameter of the 6-core optical fiber micro-tube is 1.2 +/-0.1 mm, the equivalent circumference diameter of the optical fiber accounts for 70-80% of the inner diameter of the micro-tube sheath, and the water-blocking yarn accounts for 10-15% of the surface area of the inner cavity of the micro-tube sheath.

Example 2

In this example, the number of optical fiber cores of the easy-to-peel dry optical fiber micro tube 20 is 12.

Each micro tube 20 is internally provided with 12 optical fibers 2, the colors of the optical fibers 2 are blue, orange, green, brown, gray, white, red, black, yellow, purple, powder and turquoise, the optical fibers adopt G.657A2 optical fibers, the diameter of a colored optical fiber coating is 200 mu m +/-10 mu m, and the optical fibers in the micro tubes 20 adopt SZ twisting.

Each microtube 20 contains 1 300D water-blocking yarn 3, the linear density of the water-blocking yarn 3 is 30000m/kg, and the performance selection requirement is as follows: the tensile strength is more than or equal to 12N, the elongation at break is more than or equal to 12 percent, the thermal shrinkage is less than or equal to 3.5 percent, the expansion rate is more than or equal to 25ml/g/min, the expansion rate is more than or equal to 30ml/g, and the water content is less than or equal to 8 percent. The water-absorbing fiber is a water-absorbing fiber solidified with polyacrylic acid and acrylate, and the matrix of the water-absorbing fiber is mainly terylene or chinlon.

The wall thickness of the microtubule sheath 1 is 0.15mm, the microtubule sheath 1 is made of a mixture of ethylene-vinyl alcohol acid copolymer and aluminum hydroxide, the mass ratio is 95:5, and the density is usually 1.4-1.5 g/cm³The tensile strength is usually 12MPa and the elongation at break is 140%. Shore hardness H of microtube sheath 1 material_AThe optical fiber micro-tube sheath 1 can be easily torn off by 1m by hands at 84.

The outer diameter of the 12-core optical fiber micro-tube 20 is usually 1.3 +/-0.1 mm, the equivalent circumference diameter of the optical fiber accounts for 70-80% of the inner diameter of the micro-tube sheath, and the water-blocking yarn accounts for 12-18% of the surface area of the inner cavity of the micro-tube sheath.

Example 3

An easy-to-strip dry optical fiber micro tube 20, the number of optical fiber cores is 12.

12 optical fibers 2 are arranged in each micro-tube 20, the colors of the optical fibers 2 are blue, orange, green, brown, gray, white, red, black, yellow, purple, powder and turquoise, the optical fibers 2 are G.657A2 optical fibers, the diameter of a colored optical fiber coating is 250 micrometers +/-10 micrometers, and the optical fibers 2 are stranded in a micro-tube sheath 1 by SZ.

Each microtube 20 contains 1 600D water-blocking yarn 3, the density of the water-blocking yarn 3 is 15000m/kg, and the performance selection requirement is as follows: the tensile strength is more than or equal to 20N, the elongation at break is more than or equal to 12 percent, the thermal shrinkage is less than or equal to 3.5 percent, the expansion rate is more than or equal to 30ml/g/min, the expansion rate is more than or equal to 40ml/g, and the water content is less than or equal to 8 percent. The water-absorbing fiber containing acrylic acid graft copolymer has base body mainly of terylene or chinlon.

The wall thickness of the microtubule sheath 1 is 0.2mm, the microtubule sheath 1 is made of a mixture of ethylene-methyl acrylate copolymer, ethylene-butyl acrylate copolymer and kaolin, the mass ratio is 45:45:10, and the density is usually 1.4-1.5 g/cm³The tensile strength is generally 18MPa and the elongation at break is 210%. Shore hardness H of microtube sheath material_ATo 89, the optical fiber micro-tube sheath 1 can be easily torn off by hand for 1 m.

The outer diameter of the 12-core optical fiber micro-tube 20 is usually 1.5 +/-0.1 mm, the equivalent circumference diameter of the optical fiber accounts for 70-80% of the inner diameter of the micro-tube sheath, and the water-blocking yarn accounts for 8-16% of the surface area of the inner cavity of the micro-tube sheath.

Table 1 below lists the outer diameters and the number of different optical fibers in the dry optical fiber micro tube 20, and the preferred values of the outer diameters of the optical fiber micro tubes.

TABLE 1

Shore hardness H of the material of the microtube sheath 1 in the easily stripped dry type optical fiber microtube 20_AThe force is not more than 90, the microtube sheath can be torn off by hands without tools, the force is small, and the optical fiber is not damaged; the minimum bending radius of the optical fiber micro-tube is 10mm, and the optical fiber micro-tube is not bent; the optical fiber micro-tube 20 does not contain factice, and water-blocking yarns are adopted as water-blocking materials, so that the optical fiber micro-tube is environment-friendly and efficient and rapid in construction; the optical fiber, the water-blocking yarn and the microtube protective layer in the optical fiber microtube have strong compatibility, and the physical and chemical properties of the large-length optical fiber are stable.

Referring to fig. 2, 3 and 4, the present invention applies the dry optical fiber micro-tube 20 to a micro-bundle optical cable structure to form a full-dry micro-bundle optical cable 100, which is generally used for an urban backbone network and is usually laid by outdoor pipeline or aerial installation.

In a basic embodiment, the microtube 20 of the 6-core optical fiber 2 is used asFor example, as shown in fig. 2, the cross-sectional structure of the full-dry microbeam optical cable 100 includes a plurality of microtubes 20, a plurality of water-blocking yarns 3, and an outer sheath 30, each water-blocking yarn 3 is filled in a gap between the plurality of microtubes 20, and a plurality of strength members 31 are embedded in the outer sheath 30. The microtube is the above-mentioned easy-to-peel dry type optical fiber microtube 20, the number of the optical cables in one optical cable can be 3, 6, 9, 12, 15, 18, 21 or 24 or 30, and the like, specifically depending on the size and performance requirements of the optical cable, the microtube 20 is helically stranded, or SZ stranded, or S stranded in the inner cavity of the outer sheath 30 to form a microtube core 84, which is arranged at the center of the optical cable. The performance of the water-blocking yarn 3 is in line with or higher than that of a first part of a water-blocking material for YDT 1115.2-communication cable and optical cable: the industry standard of water-blocking yarn is standard. The outer sheath 30 is made of polyolefin material, usually medium density polyethylene or high density polyethylene, or low smoke halogen-free flame retardant polyolefin material. The reinforcement 31 is usually a glass Fiber Reinforced Plastic (FRP) rod, and the density of the FRP is 2.05-2.15 g/cm³The tensile and bending strength is more than or equal to 1100MPa, the tensile and bending elastic modulus is more than or equal to 50GPa, the elongation at break is less than or equal to 4 percent, the water absorption is less than or equal to 0.1 percent, and the thermal expansion coefficient is lower by 5 multiplied by 10^-5～6×10^-5K^-1And the acid and alkali resistance and the chemical property are stable. In order to ensure the adhesion between FRP and the outer sheath, the surface is usually coated with a layer of organic polymer, the main component of which is ethylene acrylic acid copolymer, and the pulling force between FRP and the outer sheath is more than or equal to 50N.

In the structure of the base optical cable, a reinforcing layer 50 (see fig. 3 or fig. 4) may be further disposed between the twisted optical fiber micro-tubes (micro-tube cores 84) and the outer sheath 30, and the reinforcing layer 50 is substantially coaxially disposed with the outer sheath 30 and the micro-tube cores 84. The reinforcing layer 50 may be any one of aramid, glass fiber yarn or polyester yarn, or any one of aramid and water-blocking yarn, glass fiber yarn and water-blocking yarn or polyester yarn and water-blocking yarn, or a mixture thereof.

In the structure of the basic optical cable, a water-blocking tape 40 (see fig. 3 and 4) may be further disposed between the twisted optical fiber micro-tubes (micro-tube cores 84) and the outer sheath 50, and the water-blocking tape 40 is substantially coaxially disposed with the outer sheath 30 and the micro-tube cores 84. The water-blocking tape 40 is usually a double-sided water-blocking tape, and is formed by sequentially compounding polyester fiber non-woven fabric, high water absorption expansion material and polyester fiber non-woven fabric, wherein the high water absorption expansion material is usually formed by compounding crosslinked polyacrylate expansion powder, is heat-resistant, does not contain acid or alkali, and has stable chemical resistance; the thickness of the water-blocking tape is less than or equal to 0.25mm, the expansion rate is more than or equal to 10mm/min, the expansion height is more than or equal to 12mm, the tensile strength is more than or equal to 40N/cm, and the elongation at break is more than or equal to 12%. In other embodiments, the water-blocking tape 40 may further embed a tearing rope 41 (as shown in fig. 4), the tearing rope 41 may be made of aramid or polyester yarn, the linear density is greater than or equal to 333tex, the tensile strength is greater than or equal to 150N, the elongation at break is greater than or equal to 12%, the softening point is greater than or equal to 238 ℃, and the melting point is greater than or equal to 265 ℃.

In the structure of the full-dry micro-bundle optical cable 100 shown in fig. 4, the optical cable comprises a micro-tube core 84, a reinforcing layer 50, a water-blocking tape 40 and an outer sheath 30 which are arranged coaxially from a core layer to an outer layer, wherein 24 micro-tubes 20 are arranged in the micro-tube core 84, and 5 water-blocking yarns 3 are randomly filled in the gap between the micro-tubes 20 and the micro-tubes 20; each micro-tube 20 consists of 5

optical fibers

2 and 1 water-blocking yarn 3 which are stranded, and a micro-tube sheath 1 which is wrapped on the outer layer of the micro-tube; the water-blocking tape 40 is embedded with 1 tearing rope 41, and the outer sheath 30 is embedded with 2 reinforcements 31 in the radial direction. When the number of the micro tubes 20 exceeds 12, it is possible to distinguish by using different numbers of color patches or color circles by inkjet printing.

Example 4

A full dry micro-beam optical cable 100, 144 cores of optical fiber 2, is substantially shown in FIG. 4.

(1) 6 optical fibers 2 are arranged in each micro-tube 20, the colors of the optical fibers 2 are blue, orange, green, brown, gray and white, G.652D optical fibers are adopted as the optical fibers, the diameter of a colored optical fiber coating is 250 micrometers +/-15 micrometers, and SZ twisting is adopted as the optical fibers in the micro-tubes.

(2) Each micro-tube 20 contains 1 300D water-blocking yarn 3, the linear density of the water-blocking yarn 3 is 30000m/kg, the tensile strength is more than or equal to 12N, the elongation at break is more than or equal to 12%, the thermal shrinkage rate is less than or equal to 3.5%, the expansion rate is more than or equal to 25ml/g/min, the expansion rate is more than or equal to 30ml/g, and the water content is less than or equal to 8%.

(3) The wall thickness of the micro-tube sheath 1 is generally between 0.1 and 0.2mm, the material of the micro-tube sheath 1 is LSZH material, and the density is generally between 1.4 and 1.5g/cm³High tensile strengthThe degree is generally 12MPa and the elongation at break is 140%.

(4) The outer diameter of the 6-core optical fiber micro-tube 20 is usually 1.2 +/-0.1 mm, the equivalent circumference diameter of the optical fiber accounts for 70-80% of the inner diameter of the micro-tube sheath, and the water-blocking yarn accounts for 8-16% of the surface area of the inner cavity of the micro-tube sheath.

(5) Microcatheter 20 is helically S-twisted within the lumen of outer sheath 30.

(6) The microtubules 20 are blue, orange, green, brown, gray, white, red, black, yellow, purple, pink, cyan, blue plus 1 black ring, orange plus 1 black ring, green plus 1 black ring, brown plus 1 black ring, gray plus 1 black ring, white plus 1 black ring, red plus 1 black ring, black plus 1 white ring, yellow plus 1 black ring, purple plus 1 black ring, pink plus 1 black ring, and cyan plus 1 black ring.

(7) The reinforcing layer 50 is made of aramid and water-blocking yarn.

(8) The water-blocking tape 40 is a double-sided water-blocking tape, the thickness of the water-blocking tape is 0.2mm, the width of the water-blocking tape is 30mm, the expansion rate is more than or equal to 10mm/min, the expansion height is more than or equal to 12mm, the tensile strength is more than or equal to 40N/cm, and the elongation at break is more than or equal to 12%.

(9) The tearing rope 41 is made of polyester yarn, the linear density is 444tex, the tensile strength is more than or equal to 150N, the breaking elongation is more than or equal to 12%, the softening point is more than or equal to 238 ℃, and the melting point is more than or equal to 265 ℃.

(10) 2 FRP reinforcements 31 are embedded in the outer sheath 30 in parallel, and the size of the reinforcements 31 is 2.0 +/-0.1 mm.

(11) The outer jacket 30 is a high density polyethylene material and has a nominal wall thickness of 2.8 mm.

(12) The total outer diameter of the 144-core full-dry micro-beam optical cable 100 is nominal 16.6mm, and the optical fiber density in the inner cavity of the optical cable is 1.52F/mm²。

Example 5

A full-dry micro-beam optical cable 100 has 288 optical fiber cores.

(1) 12 optical fibers 2 are arranged in each micro-tube 20, the colors of the optical fibers 2 are blue, orange, green, brown, gray, white, red, black, yellow, purple, powder and turquoise, the optical fibers are G.657A2 optical fibers, the diameter of a colored optical fiber coating is 200 mu m +/-10 mu m, and the optical fibers 2 are stranded in the micro-tubes 20 by SZ.

(2) Each micro tube 20 contains 1 600D water-blocking yarn 3, the density of the water-blocking yarn is 15000m/kg, the tensile strength is larger than or equal to 12N, the elongation at break is larger than or equal to 12%, the thermal shrinkage rate is smaller than or equal to 3.5%, the expansion rate is larger than or equal to 25ml/g/min, the expansion rate is larger than or equal to 30ml/g, and the water content is smaller than or equal to 8%.

(3) The wall thickness of the micro-tube sheath 1 is generally between 0.1 and 0.2mm, the material of the micro-tube sheath 1 is LSZH material, and the density is generally between 1.4 and 1.5g/cm³The tensile strength is usually 12MPa and the elongation at break is 140%.

(4) The outer diameter of the 12-core microtube 20 is usually 1.4 +/-0.1 mm, the equivalent circumferential diameter of the optical fiber accounts for 70-80% of the inner diameter of the microtube, and the water-blocking yarn accounts for 10-15% of the surface area of the inner cavity of the microtube sheath.

(7) The reinforcing layer 50 is made of glass fiber yarn and water-blocking yarn.

(8) The water-blocking tape 40 is a double-sided water-blocking tape, the thickness of the water-blocking tape is 0.2mm, the width of the water-blocking tape is 34mm, the expansion rate is more than or equal to 10mm/min, the expansion height is more than or equal to 12mm, the tensile strength is more than or equal to 40N/cm, and the elongation at break is more than or equal to 12%.

(9) The tearing rope 41 can be made of polyester yarn, the linear density is 444tex, the tensile strength is more than or equal to 150N, the breaking elongation is more than or equal to 12%, the softening point is more than or equal to 238 ℃, and the melting point is more than or equal to 265 ℃.

(10) 2 FRP reinforcements 31 are embedded in the outer sheath 30 in parallel, and the size of the reinforcements 31 is 1.8 +/-0.1 mm.

(11) The outer sheath 30 is made of high density polyethylene material, and the wall thickness of the outer sheath 30 is nominally 2.6 mm.

(12) The overall 100 outer diameter of the 288-core full-dry micro-beam optical cable is nominal 15.1mm, and the optical fiber density in the inner cavity of the optical cable is 3.74F/mm²。

The utility model discloses an improve optical fiber density in the 100 inner chambers of optical cable in order to increase communication capacity, improved based on above-mentioned basic optical cable structure, improved the part and lie in adopting around ribbon 80 with many microtubes 20 around the combination of bundling, obtain the microtube core 84 of transposition again. The wrapping band 80 may be polyester yarn, aramid yarn or polyester tape or a combination thereof. The thickness of wrap 80 is typically 0.1-0.2mm and its equivalent width is typically 0.1-2 mm. Usually 8-12 microtubes 20 are combined in a bundle of winding microtubes 82 by winding ribbons 80, and each bundle of winding microtubes 82 is divided by winding ribbons 80 with different colors, and then twisted together to form a cable core (a microtube core 84) together with water-blocking yarns. The utility model discloses still calculate the optimization micropipe core 84 structure through following optical density formula, effectively improve optical density and optic fibre 2 and account for than in the space of sheath inner chamber.

σ＝N/(π×R²) (1)

Wherein: sigma is the optical fiber density, N is the number of optical fibers, and R is the radius of the inner cavity of the optical cable. The density of the optical fibers in the inner cavity of the optical cable is usually 3.8-10F/mm²Which is defined as the number of optical fibers in the cable divided by the surface area of the cable lumen.

R＝(D+K)/2 (2)

Wherein: r is the radius of the inner cavity of the optical cable, D is the equivalent diameter of the cable core, K is a correction coefficient, and the value of K is generally 0.5-1.0 mm. The radius of the inner cavity of the optical cable is defined as half of the equivalent diameter of the cable core of the optical cable plus a correction coefficient.

D＝(M₁×N₁+D₁ ²+N₂×0.43²)^1/2(3)

Wherein: m₁Is the thickness of the wrapping tape, N₁Number of wrapping bands, N₂Is the equivalent number of water-blocking yarns, which is the total density specification of the water-blocking yarns divided by 1420Denier, D₁The equivalent diameter of the micro-beam tube in the optical cable is stranded.

D₁＝1.16×N₃ ^1/2×D₂(4)

Wherein: n is a radical of₃Number of micropipes, D₂The outer diameter of the microtube.

As can be seen from the above formulas (1) - (4), the optical fiber density in the inner cavity of the optical cable of the utility model is:

For example, in the conventional structure of fig. 2, 3 and 4, the fiber density in the cable cavity is:

wherein: the density unit of the optical fiber is F/mm²(ii) a N is the number of optical fibers; n is a radical of₃Number of dry optical fiber micro-tubes, D₂The outer diameter of the dry optical fiber micro-tube is in mm.

The utility of the present invention in increasing the fiber density of a fiber optic cable is illustrated below.

Referring to fig. 5, 6 and 7, the optical cable 100 may have a structure including only a plurality of microtubes combined by winding and

binding microtubes

82, 84, a plurality of water-blocking yarns 3 and an outer sheath 30, the plurality of water-blocking yarns 3 are filled in the hollow space between the winding and binding microtubes 82 and the winding and binding microtubes 82, the winding and binding microtubes 82 are formed by winding and binding a plurality of microtubes 20 by a winding and binding tape 80 and a plurality of water-blocking yarns 3 filled in the space, and a plurality of reinforcing members 31 are embedded in the outer sheath 30. In other embodiments, cable 100 may also include one or more structures similar to water-blocking tape 40, reinforcing layer 50, or ripcord 41 described above.

Example 6

A full dry type micro-beam optical cable, 432 cores of optical fiber cores, is provided, and the structure is substantially shown in figure 7.

(1) 12 optical fibers 2 are arranged in each micro-tube 20, the colors of the optical fibers 2 are blue, orange, green, brown, gray, white, red, black, yellow, purple, powder and turquoise, the optical fibers 2 are G.657A2 optical fibers, the diameter of a colored optical fiber coating is 250 micrometers +/-10 micrometers, and the optical fibers 2 are stranded in the micro-tubes 20 by SZ.

(2) Each micro tube 20 contains 1 600D water-blocking yarn 3, the density of the water-blocking yarn 3 is 15000m/kg, the tensile strength is more than or equal to 20N, the elongation at break is more than or equal to 12%, the thermal shrinkage rate is less than or equal to 3.5%, the expansion rate is more than or equal to 30ml/g/min, the expansion rate is more than or equal to 40ml/g, and the water content is less than or equal to 8%.

(4) The outer diameter of the 12-core micro-tube 20 is usually 1.5 +/-0.1 mm, the equivalent circumferential diameter of the optical fiber accounts for 70-80% of the inner diameter of the micro-tube sheath, the inner diameter of the micro-tube is 1.1-1.3 mm, the equivalent diameter of the water blocking yarn in the micro-tube is about 0.35mm, and the equivalent diameter accounts for about 7% -10% of the surface area of the inner cavity.

(5) The microcatheter 20 is helically stranded within the lumen of the outer sheath 30 using a helical SZ.

(6) The microtubules 20 are blue, orange, green, brown, gray, white, red, black, yellow, violet, pink, cyan, blue plus 1 black ring, orange plus 1 black ring, green plus 1 black ring, brown plus 1 black ring, gray plus 1 black ring, white plus 1 black ring, red plus 1 black ring, black plus 1 white ring, yellow plus 1 black ring, purple plus 1 black ring, pink plus 1 black ring, cyan plus 1 black ring, blue plus 2 black rings, orange plus 2 black rings, green plus 2 black rings, brown plus 2 black rings, gray plus 2 black rings, white plus 2 black rings, red plus 2 black rings, black plus 2 white rings, yellow plus 2 black rings, purple plus 2 black rings, pink plus 2 black rings, and cyan plus 2 black rings.

(7) Wrap 80 is a polyester yarn.

(8) The thickness of the polyester yarn is 0.1mm, and the number of the winding bands 80 is 3.

(9) The reinforcing layer 50 is a water-blocking yarn, and the number of the water-blocking yarn is 26 and 3000 Denier.

(10) Micro-tube strand outer diameter D₁＝1.16×36^1/2X 1.5 is 10.44mm, and the outer stranded diameter D of the cable core is (0.1 x 3+10.44 mm)²+26×3000/1420×0.43²)^1/210.93mm, the outer diameter of the inner cavity is 11.83mm, and the density of the optical fiber in the inner cavity is 3.93F/mm²The conventional optical fiber cable has an inner cavity fiber density of 3.28F/mm as shown in FIG. 4²This design provides a 19.8% increase in fiber density.

(11) The water-blocking tape 40 is a double-sided water-blocking tape, the thickness of the water-blocking tape is 0.2mm, the width of the water-blocking tape is 40mm, the expansion rate is more than or equal to 10mm/min, the expansion height is more than or equal to 12mm, the tensile strength is more than or equal to 40N/cm, and the elongation at break is more than or equal to 12%. The tearing rope 41 can be made of polyester yarn, the linear density is 444tex, the tensile strength is more than or equal to 150N, the elongation at break is more than or equal to 12 percent, the softening point is more than or equal to 238 ℃, and the melting point is more than or equal to 265 DEG C

(12)2 FRP reinforcements 31 are embedded in the outer sheath 30 in parallel, and the size of the reinforcements is 1.8 +/-0.1 mm.

(13) The outer jacket 30 is a high density polyethylene material and has a nominal wall thickness of 2.8 mm.

(14) The overall outside diameter of the 432-core full-dry microbeam optical cable 100 is nominally 17.4 mm.

Example 7

A full-dry micro-beam optical cable 100 comprises 720 optical fiber cores.

(1) 12 optical fibers 2 are arranged in each microtube 20, the colors of the optical fibers are blue, orange, green, brown, gray, white, red, black, yellow, purple, powder and turquoise, the optical fibers adopt G.657A2 optical fibers, the diameter of a colored optical fiber coating is 250 mu m +/-10 mu m, and the optical fibers adopt SZ twisting in the microtube.

(2) Each micro-tube contains 1 600D water-blocking yarn 3, the density of the water-blocking yarn is 15000m/kg, the tensile strength is more than or equal to 20N, the elongation at break is more than or equal to 12 percent, the thermal shrinkage rate is less than or equal to 3.5 percent, the expansion rate is more than or equal to 30ml/g/min, the expansion rate is more than or equal to 40ml/g, and the water content is less than or equal to 8 percent.

(3) The wall thickness of the micro-tube sheath 1 is generally between 0.1 and 0.2mm, the material of the micro-tube sheath is LSZH material, and the density is generally 1.4 to 1.5g/cm³The tensile strength is usually 12MPa and the elongation at break is 140%.

(4) The outer diameter of the 12-core micro-tube 20 is usually 1.5 +/-0.1 mm, the equivalent circumferential diameter of the optical fiber accounts for 70-80% of the inner diameter of the micro-beam tube, the inner diameter of the micro-tube is 1.1-1.3 mm, the equivalent diameter of the water blocking yarn in the micro-tube is about 0.35mm, and the equivalent diameter accounts for about 7-10% of the area of an inner cavity.

(7) Wrap 80 is a polyester yarn.

(8) The thickness of the polyester yarn is 0.1mm, and the number of the winding bands 80 is 5.

(9) The reinforcing layer 50 is water-blocking yarn, and the number of the water-blocking yarn is 42 and 3000 Denier.

(10) Micro-tube strand outer diameter D₁＝1.16×60^1/2X 1.5 is 13.48mm, and the outer stranded diameter D of the cable core is (0.1 x 5+13.48 mm)²+42×3000/1420×0.43²)^1/214.09mm, the outer diameter of the inner cavity is 15.09mm, and the density of the optical fiber in the inner cavity is 4.03F/mm²The density of the optical fiber in the inner cavity of the conventional optical cable shown in FIG. 4 is 3.59F/mm²The density of the optical fiber is improved by 12.2 percent.

(11) The water-blocking tape 40 is a double-sided water-blocking tape, the thickness of the water-blocking tape is 0.2mm, the width of the water-blocking tape is 40mm, the expansion rate is more than or equal to 10mm/min, the expansion height is more than or equal to 12mm, the tensile strength is more than or equal to 40N/cm, and the elongation at break is more than or equal to 12%.

(12)2 FRP reinforcements 31 are embedded in the outer sheath 30 in parallel, and the size of the reinforcements is 2.0 +/-0.1 mm.

(13) The outer jacket 30 is a high density polyethylene material with a nominal jacket wall thickness of 3.0 mm.

(14) The 720-core full-dry microbeam optical cable 100 has a nominal 21.1mm outside diameter as a whole.

Example 8

A full-dry micro-beam optical cable 100 comprises 720 optical fiber cores.

(1) 12 optical fibers 2 are arranged in each micro-tube 20, the colors of the optical fibers are blue, orange, green, brown, gray, white, red, black, yellow, purple, powder and turquoise, the optical fibers adopt G.657A2 optical fibers, the diameter of a colored optical fiber coating is 200 mu m +/-10 mu m, and SZ twisting is adopted in the micro-tubes.

(2) Each micro-tube 20 contains 1 300D water-blocking yarn 3, the density of the water-blocking yarn is 30000m/kg, the tensile strength is more than or equal to 20N, the elongation at break is more than or equal to 12%, the thermal shrinkage rate is less than or equal to 3.5%, the expansion rate is more than or equal to 30ml/g/min, the expansion rate is more than or equal to 40ml/g, and the water content is less than or equal to 8%.

(4) The outer diameter of the 12-core micro-tube 20 is usually 1.3 +/-0.1 mm, the equivalent circumferential diameter of the optical fiber accounts for 70-80% of the inner diameter of the micro-tube sheath, the inner diameter of the micro-tube is 0.9-1.1 mm, the equivalent diameter of the water blocking yarn in the micro-tube is about 0.25mm, and the equivalent diameter accounts for about 5% -8% of the area of the inner cavity.

(5) The microcatheter 20 is helically stranded within the outer sheath lumen using a helical SZ.

(7) Wrap 80 is a polyester tape.

(8) The thickness of the polyester yarn is 0.1mm, and the number of the winding bands is 5.

(9) The reinforcing layer 50 is water-blocking yarn, and the number of the water-blocking yarn is 30 3000 Denier.

(10) Micro-tube strand outer diameter D₁＝1.16×60^1/2X 1.3 is 11.68mm, and the outer stranded diameter D of the cable core is (0.1 x 5+11.68 mm)²+30×3000/1420×0.43²)^1/212.19mm, the outer diameter of the inner cavity is 12.69mm, and the density of the optical fiber in the inner cavity is 5.69F/mm²The conventional optical fiber cable has an optical fiber density of 4.56F/mm in the cavity as shown in FIG. 4²The density of the optical fiber is improved by 24.8 percent.

(13) The outer jacket 30 is a high density polyethylene material and has a nominal wall thickness of 2.6 mm.

(14) The 720-core full-dry microbeam optical cable 100 has a nominal 17.9mm outside diameter overall.

The winding and binding full-dry type microbeam optical cable is free of grease filling, environment-friendly and pollution-free, does not need grease cleaning during construction, and is efficient and rapid; the dry water-blocking material has good compatibility with the optical fiber, and the performance of the optical fiber is not influenced after long-term coexistence; the dry-type water-blocking material has stable performance along with the temperature change, and the optical fiber transmission characteristic does not change along with the temperature change; the dry water-blocking material accounts for less than 20% of the inner diameter surface area of the micro-tube, and has no influence on the performance of the micro-beam tube sheath for a long time; after several micro-bundle tubes are wound and bundled by adopting the winding and bundling belt, the density of the optical fiber and the space occupation ratio of the optical fiber in the inner cavity of the sheath can be effectively improved.

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 a full-dry type microbeam optical cable, includes the micell core and cladding in the oversheath of the periphery of micell core and imbeds a plurality of reinforcements in the oversheath, its characterized in that: the micro tube core comprises a plurality of winding and binding micro tubes and a plurality of water-blocking yarns, and the plurality of water-blocking yarns are filled in gaps between the winding and binding micro tubes; the winding and binding microtubes comprise winding and binding bands, a plurality of dry type optical fiber microtubes and a plurality of water-blocking yarns, the dry type optical fiber microtubes are wrapped by the winding and binding bands, each dry type optical fiber microtube comprises a microtube sheath, the water-blocking yarns and optical fibers, the water-blocking yarns and the optical fibers are wrapped in the microtube sheath, and the optical fiber density in an inner cavity of the optical cable:

wherein: the density unit of the optical fiber is F/mm²(ii) a N is the number of optical fibers; k is a correction coefficient and takes a value of 0.5-1.0 mm; m₁Is the thickness of the wrapping tape, N₁The number of the winding bands is; n is a radical of₂The number of the water-blocking yarns is equivalent; n is a radical of₃Number of dry optical fiber micro-tubes, D₂The outer diameter of the dry optical fiber micro-tube is shown.

2. The fully dry microbeam optical cable of claim 1 in which: the water-blocking yarn accounts for 20% and less of the surface area of the inner cavity of the microtube sheath.

3. The fully dry microbeam optical cable of claim 1 in which: the water-blocking yarn accounts for 10% and less of the surface area of the inner cavity of the microtube sheath.

4. The fully dry microbeam optical cable of claim 1 in which: the proportion of the equivalent circumferential diameters of a plurality of optical fibers in the dry type optical fiber microtube in the inner cavity of the microtube sheath is less than 90% and more than or equal to 70%.

5. The fully dry microbeam optical cable of claim 1 in which: the equivalent circumferential diameters of a plurality of optical fibers in the dry type optical fiber microtube are 70% -80% of the inner cavity of the microtube sheath.

6. The fully dry microbeam optical cable of claim 1 in which: the thickness of the microtubule sheath is 0.1-0.2 mm.

7. The fully dry microbeam optical cable of claim 1 in which: and a coaxially arranged reinforcing layer is also arranged between the microchip and the outer sheath.

8. The fully dry microbeam optical cable of claim 1 in which: the micro-tube core and the outer sheath further comprise a coaxially arranged water blocking tape, and the water blocking tape is a double-sided water blocking tape.

9. The totally dry microbeam optical cable of claim 8, which is characterized in that: the water blocking belt also comprises a plurality of embedded tearing ropes.

10. The fully dry microbeam optical cable of claim 1 in which: the full-dry micro-bundle optical cable sequentially comprises an outer sheath, a water-blocking tape, a reinforcing layer and a micro-tube core from outside to inside, wherein two reinforcing pieces are embedded in the outer sheath in the radial direction, a tearing rope is embedded in the water-blocking tape, and the micro-tube core comprises a plurality of winding micro-tubes and a plurality of water-blocking yarns filled in gaps among the winding micro-tubes.