Air-blowing micro cable

Abstract

The utility model belongs to the technical field of optical cables, and discloses an air-blowing micro cable, which is provided with a cable core, the cable core is composed of a central reinforcing piece and at least three loose tubes, the loose tubes are twisted outside the central reinforcing piece, at least one optical fiber is arranged in each loose tube, a buffer layer is arranged outside the cable core, a self-repairing layer is arranged outside the buffer layer, and an outer protective layer is arranged outside the self-repairing layer. The self-repairing layer is composed of a plurality of capsules, the capsules are evenly distributed between the buffer layer and the outer protection layer, the distance between every two adjacent capsules is smaller than 0.3 mm, the capsules are filled with liquid adhesives, and the surface of the outer protection layer is coated with an anti-electromagnetic interference coating. The cable has the advantages of being simple in structure, convenient to manufacture, good in impact resistance and the like, and the sheath can be self-repaired.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical cables, in particular to an air-blown micro cable. Background Art

[0002] With the continuous development of the optical communication industry, operators are expanding their networks more and more frequently. In the construction of optical fiber communication networks, due to the large outer diameter and heavy weight of traditional communication optical cables, a large amount of space is required when laying pipelines, resulting in a relatively low utilization rate of pipelines. Therefore, the pipeline resources for laying optical cables are becoming increasingly tight, and the existing pipeline resources can hardly meet the needs of optical cable network expansion. Some people have proposed a solution to build new communication pipelines, but this solution faces the problems of high capital cost, high construction difficulty, and certain damage to public facilities. Therefore, the application value of air-blown micro optical cables (abbreviated as air-blown micro cables) has attracted more and more attention from operators.

[0003] Compared with traditional optical cables, air-blown micro cables with the same number of cores have greatly reduced the amount of cabling materials and processing costs, small structural dimensions, light weight, and high fiber density. During laying, the air-blown micro cables can be directly blown into the existing communication pipeline by using high-pressure airflow, which greatly increases the utilization rate of the pipeline, effectively saves pipeline resources, and meets the construction needs of network expansion. At the same time, air-blown laying is convenient and fast, which can effectively shorten the construction period.

[0004] At present, air-blown microcables are generally laid in silicon core tubes. Once the air-blown microcable fails, it is relatively difficult to repair.

[0005] In the prior art, CN117741880A discloses a self-repairing optical cable, comprising a cable core, an outer sheath and a self-repairing component, wherein the self-repairing component comprises microcapsule A and microcapsule B, wherein microcapsule A comprises capsule shell A and adhesive, wherein the ingredients of the adhesive comprise: epoxy acrylate resin, acrylic modified epoxy resin copolymer, polyurethane prepolymer, filler, accelerator and stabilizer; microcapsule B comprises capsule shell B and a hardener, wherein the ingredients of the hardener comprise: epoxy acrylate resin, tackifying resin, plasticizer, filler, polyurethane curing agent, peroxide and stabilizer.

[0006] The above-mentioned prior art has the following drawbacks: 1. The glue in the capsule is slow to come out, and the glue has dried up before the damaged area is completely filled, resulting in incomplete repair; 2. The capsules are distributed in the outer sheath, which easily causes the mechanical properties of the outer sheath to decrease; 3. The impact resistance of the cable is poor. Utility Model Content

[0007] In order to solve the above problems, the purpose of the utility model is to disclose an air-blown microcable, which is achieved by adopting the following technical solutions.

[0008] An air-blown microcable comprises a cable core, wherein the cable core is composed of a central reinforcement member and at least three loose tubes, the loose tubes are twisted outside the central reinforcement member, at least one optical fiber is arranged inside the loose tubes, a buffer layer is arranged outside the cable core, a self-repairing layer is arranged outside the buffer layer, an outer sheath is arranged outside the self-repairing layer, the self-repairing layer is composed of a plurality of capsules, the capsules are evenly distributed between the buffer layer and the outer sheath, the spacing between two adjacent capsules is less than 0.3 mm, liquid adhesive is contained in the capsules, and a layer of anti-electromagnetic interference coating is coated on the surface of the outer sheath.

[0009] In the above-mentioned air-blown microcable, the self-repairing layer is composed of a plurality of capsule strings, the capsule strings are composed of a plurality of capsules connected in series in sequence through connecting lines, the capsule strings are distributed parallel to the buffer layer and the outer sheath along the length direction of the cable, in the same capsule, the spacing between two adjacent capsules is less than 0.3 mm, and the spacing between two adjacent capsule strings is less than 0.3 mm.

[0010] In the above-mentioned air-blown microcable, two adjacent capsule strings are connected via a connecting membrane.

[0011] In the above-mentioned air-blown microcable, the self-healing layer is composed of multiple capsule strings, the capsule string is composed of multiple capsules connected in sequence through a connecting membrane, the capsule string surrounds the buffer layer, and the multiple capsule strings are distributed along the length direction of the cable. In the same capsule, the distance between two adjacent capsules is less than 0.3mm, and the distance between two adjacent capsule strings is less than 0.3mm.

[0012] The above-mentioned air-blown microcable has the number of optical fiber cores in the cable core of ≥6, the number of cores in each loose tube of ≥2, and the optical fibers are in bundles.

[0013] In the above-mentioned air-blown microcable, the loose tube is made of polybutylene terephthalate or thermoplastic polyester elastomer or polyterephthalate plastic or polycarbonate plastic.

[0014] The air-blown microcable described above has a micro sensor and a signal transmission unit in the outer sheath. The micro sensor is used to monitor the temperature, humidity, strain and other parameters of the microcable in real time, and the signal transmission unit is used to transmit the monitored data to a remote control center.

[0015] In the above-mentioned air-blown microcable, the outer wall of the outer sheath is recessed toward the central reinforcement member at intervals along the length direction of the cable.

[0016] In the above-mentioned air-blown microcable, the buffer layer is made of foam material and has excellent buffering and heat insulation properties.

[0017] In the above-mentioned air-blown microcable, the material of the liquid adhesive is epoxy resin.

[0018] A method for preparing the above-mentioned air-blown microcable comprises the following steps:

[0019] Step 01: Cure a layer of colored ink on the outside of the optical fiber;

[0020] Step 02: Extruding a loose tube outside the optical fiber bundle formed by multiple optical fibers, the outer diameter of the loose tube is 1.4mm-1.5mm;

[0021] Step 03: Twist at least three loose tubes outside the central reinforcement member in a layer-twisted manner and fix them with binding yarn to form a cable core;

[0022] Step 04: Wrap a buffer layer around the cable core;

[0023] Step 05: Extrude an outer protective layer outside the buffer layer. While extruding the outer protective layer, place a capsule string between the outer protective layer and the buffer layer to form a self-repairing layer;

[0024] Step 06: A layer of anti-electromagnetic interference coating is applied on the outer sheath.

[0025] This application has the following beneficial effects:

[0026] 1. The present application provides a self-repairing layer between the outer sheath and the buffer layer. The self-repairing layer is composed of a plurality of capsules. During the production of the microcable, the capsules of the repair layer are squeezed after the outer sheath cools and shrinks. When the outer sheath of the microcable is damaged and the capsule wall of the capsule is destroyed, the pressure received by the capsule is released, and the liquid adhesive in the capsule is directed toward and fills the upper wound of the sheath, hardens after drying for a short time, and repairs the damaged sheath.

[0027] 2. The self-healing layer is composed of multiple independent capsules, which are filled with liquid adhesive to give the capsules a certain elasticity, thereby improving the impact resistance of the microcable.

[0028] 3. The capsules are independently set, and the damage of a single capsule will hardly affect the self-repair performance of the entire microcable.

[0029] 4. Even if the capsule is broken while the sheath is intact, the liquid adhesive that flows out of the broken capsule will harden quickly to form a hardened agglomerate, which is equivalent to enhancing the strength at the broken capsule.

[0030] 5. It has micro sensors and signal transmission units. The micro sensors can monitor the temperature, humidity, strain and other parameters of the micro cables in real time, and the signal transmission unit can transmit the monitored data to the remote control center.

[0031] 6. The outer wall of the outer sheath is recessed toward the central reinforcement at intervals along the length of the cable, which saves materials and reduces costs. Different parts of the microcable have different diameters, which can be adjusted according to actual wiring requirements and terrain conditions to achieve a more flexible laying method.

[0032] 7. The microcable has a simple structure and is easy to prepare. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is the front view of embodiment 1 of the utility model.

[0034] Figure 2 It is a three-dimensional structural schematic diagram of a cable core, a buffer layer and a self-repairing layer of a section of Example 1 of the utility model.

[0035] Figure 3 It is a schematic diagram of the three-dimensional structure of a section of the self-repairing layer assembly of Example 2 of the utility model.

[0036] Figure 4 It is a schematic diagram of the three-dimensional structure of the self-repairing layer assembly of Example 3 of the utility model.

[0037] In the figure, 1. central reinforcement, 2. optical fiber, 3. loose tube, 4. buffer layer, 5. self-repairing layer, 51. capsule, 52. connecting wire, 53. connecting film, 6. outer sheath. DETAILED DESCRIPTION

[0038] Example 1: Figure 1 and Figure 2 , an air-blown microcable, comprising a cable core, the cable core being composed of a central reinforcement member 1 and at least three loose tubes 3, the loose tubes 3 being twisted outside the central reinforcement member 1, at least one optical fiber 2 being arranged in the loose tube 3, a buffer layer 4 being arranged outside the cable core, a self-repairing layer 5 being arranged outside the buffer layer 4, an outer sheath 6 being arranged outside the self-repairing layer 5, the buffer layer 4 being made of a foam material and having excellent buffering and heat-insulating properties, the self-repairing layer 5 being composed of a plurality of capsules 51, the capsules 51 being evenly distributed between the buffer layer 4 and the outer sheath 6, the spacing between two adjacent capsules 51 being less than 0.3 mm, a liquid adhesive being contained in the capsules 51, the material of the liquid adhesive being epoxy resin, and a layer of anti-electromagnetic interference coating being coated on the surface of the outer sheath 6.

[0039] Example 2: Figure 3 , and refer to Figure 1, an air-blown microcable, comprising a cable core, the cable core being composed of a central reinforcement member 1 and at least three loose tubes 3, the loose tubes 3 being twisted outside the central reinforcement member 1, at least one optical fiber 2 being arranged in the loose tube 3, a buffer layer 4 being arranged outside the cable core, a self-repairing layer 5 being arranged outside the buffer layer 4, an outer sheath 6 being arranged outside the self-repairing layer 5, the buffer layer 4 being made of a foam material and having excellent buffering and heat-insulating properties, the self-repairing layer 5 being composed of a plurality of capsule strings, the capsule string being composed of a plurality of capsules 51 being serially connected in sequence through a connecting line 52, the capsule strings being distributed in parallel between the buffer layer 4 and the outer sheath 6 along the length direction of the cable, the spacing between two adjacent capsules 51 in the same capsule being less than 0.3 mm, the spacing between two adjacent capsule strings being less than 0.3 mm, a liquid adhesive being contained in the capsule 51, the material of the liquid adhesive being epoxy resin, and a layer of anti-electromagnetic interference coating being coated on the surface of the outer sheath 6.

[0040] Example 3: Figure 4 , and refer to Figure 1 , an air-blown microcable, comprising a cable core, the cable core being composed of a central reinforcement member 1 and at least three loose tubes 3, the loose tubes 3 being twisted outside the central reinforcement member 1, at least one optical fiber 2 being arranged in the loose tube 3, a buffer layer 4 being arranged outside the cable core, a self-repairing layer 5 being arranged outside the buffer layer 4, an outer sheath 6 being arranged outside the self-repairing layer 5, the buffer layer 4 being made of a foam material and having excellent buffering and heat-insulating properties, the self-repairing layer 5 being composed of a plurality of capsule strings, the capsule string being sequentially connected by a plurality of capsules 51 through a connecting film 53, the capsule string being embraced outside the buffer layer 4, the plurality of capsule strings being distributed along the length direction of the cable, the spacing between two adjacent capsules 51 in the same capsule being less than 0.3 mm, the spacing between two adjacent capsule strings being less than 0.3 mm, the spacing between two adjacent capsule strings being less than 0.3 mm, a liquid adhesive being contained in the capsule 51, the material of the liquid adhesive being epoxy resin, and a layer of anti-electromagnetic interference coating being coated on the surface of the outer sheath 6.

[0041] Embodiment 4: This embodiment is basically the same as Embodiment 2, except that two adjacent capsule strings are connected via a connecting membrane 53 .

[0042] In the above-mentioned air-blown microcable, the number of optical fiber cores in the cable core is ≥6, the number of cores in each loose tube is ≥2, and the optical fibers are arranged in an array.

[0043] In the above-mentioned air-blown microcable, the loose tube 3 is made of polybutylene terephthalate or thermoplastic polyester elastomer or polyterephthalate plastic or polycarbonate plastic.

[0044] The air-blown microcable described above has a micro sensor and a signal transmission unit in the outer sheath 6. The micro sensor is used to monitor the temperature, humidity, strain and other parameters of the microcable in real time, and the signal transmission unit is used to transmit the monitored data to the remote control center.

[0045] In the above-mentioned air-blown microcable, the outer wall of the outer sheath 6 is recessed toward the central reinforcement member 1 at intervals along the length direction of the cable.

[0046] Embodiment 5: A method for preparing the air-blown microcable described in Embodiment 2 comprises the following steps:

[0047] Step 01: solidify a layer of colored ink on the outside of the optical fiber 2. After coloring, the colors of the optical fiber 2 are: blue, orange, green, brown, gray, white, red, black, yellow, purple, pink and cyan;

[0048] Step 02: Extruding a loose tube 3 outside the optical fiber bundle formed by multiple optical fibers, the outer diameter of the loose tube 3 is 1.4 mm-1.5 mm;

[0049] Step 03: Twisting at least three loose tubes 3 outside the central reinforcement member 1 in a layer-twisting manner and fixing them with binding yarn to form a cable core;

[0050] Step 04: Coating a buffer layer 4 on the outside of the cable core;

[0051] Step 05: Extruding an outer protective layer 6 outside the buffer layer 4, while extruding the outer protective layer 6, placing a capsule string between the outer protective layer 6 and the buffer layer 4 to form a self-repairing layer 5;

[0052] Step 06: A layer of anti-electromagnetic interference coating is applied on the outer sheath 6.

[0053] The above-mentioned air-blown microcable is characterized in that the model of the optical fiber 2 is G.652, G.654, G.655 or G.657.

[0054] This application has the following beneficial effects:

[0055] 1. The present application provides a self-repairing layer 5 between the outer sheath 6 and the buffer layer 4. The self-repairing layer 5 is composed of a plurality of capsules 51. When the microcable is produced, the capsules 51 of the repair layer 5 are squeezed after the outer sheath cools and shrinks. When the outer sheath 6 of the microcable is damaged and the capsule wall of the capsule 51 is destroyed, the pressure received by the capsule 51 is released, and the liquid adhesive in the capsule 51 is directed toward and fills the upper wound of the sheath 6, hardens after drying for a short time, and repairs the damaged sheath 6.

[0056] 2. The self-repairing layer 5 is composed of a plurality of independent capsules 51, and the capsules 51 are filled with liquid adhesive, so that the capsules 51 have a certain elasticity, thereby improving the impact resistance of the microcable.

[0057] 3. The capsule 51 is independently arranged, and damage to a single capsule 51 will hardly affect the self-repairing performance of the entire microcable.

[0058] 4. Even if the capsule 51 is broken while the sheath 6 is intact, the liquid adhesive flowing out of the broken capsule 51 will harden quickly to form a hardened agglomerate, which is equivalent to enhancing the strength at the broken capsule 51.

[0059] 5. It has micro sensors and signal transmission units. The micro sensors can monitor the temperature, humidity, strain and other parameters of the micro cables in real time, and the signal transmission unit can transmit the monitored data to the remote control center.

[0060] 6. The outer wall of the outer sheath 6 is recessed toward the central reinforcement member 1 at intervals along the length of the cable, which saves materials and reduces costs. Different parts of the microcable have different diameters, which can be adjusted according to actual wiring requirements and terrain conditions to achieve a more flexible laying method.

[0061] 7. The microcable has a simple structure and is easy to prepare.

[0062] The above embodiments are only preferred technical solutions of the present utility model and should not be regarded as limitations of the present utility model. The protection scope of the present utility model shall be the technical solution recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solution recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present utility model.

Claims

1. An air-blown microcable having a cable core, the cable core being composed of a central reinforcement member (1) and at least three loose tubes (3), the loose tubes (3) being twisted outside the central reinforcement member (1), and at least one optical fiber (2) being arranged in the loose tubes (3), characterized in that: A buffer layer (4) is provided outside the cable core, a self-repairing layer (5) is provided outside the buffer layer (4), an outer protective layer (6) is provided outside the self-repairing layer (5), the self-repairing layer (5) is composed of a plurality of capsules (51), the capsules (51) are evenly distributed between the buffer layer (4) and the outer protective layer (6), the spacing between two adjacent capsules (51) is less than 0.3 mm, a liquid adhesive is contained in the capsules (51), and a layer of anti-electromagnetic interference coating is coated on the surface of the outer protective layer (6).

2. An air-blown microcable according to claim 1, characterized in that: The self-repairing layer (5) is composed of a plurality of capsule strings, wherein the capsule string is composed of a plurality of capsules (51) connected in series in sequence via a connecting line (52), and the capsule string is distributed in parallel between the buffer layer (4) and the outer sheath (6) along the length direction of the cable, and in the same capsule, the spacing between two adjacent capsules (51) is less than 0.3 mm, and the spacing between two adjacent capsule strings is less than 0.3 mm.

3. An air-blown microcable according to claim 2, characterized in that: Two adjacent capsule strings are connected via a connecting membrane (53).

4. The air-blown microcable according to claim 1, characterized in that: The self-repairing layer (5) is composed of a plurality of capsule strings, wherein the capsule string is composed of a plurality of capsules (51) connected in sequence via a connecting film (53), the capsule string surrounds the outside of the buffer layer (4), and the plurality of capsule strings are distributed along the length direction of the cable. In the same capsule, the spacing between two adjacent capsules (51) is less than 0.3 mm, and the spacing between two adjacent capsule strings is less than 0.3 mm.

5. The air-blown microcable according to claim 4, characterized in that: The number of optical fiber cores in the cable core is ≥6, the number of cores in each loose tube is ≥6, and the optical fibers are in bundles.

6. An air-blown microcable according to claim 5, characterized in that: The loose tube (3) is made of polybutylene terephthalate or thermoplastic polyester elastomer or polyterephthalate plastic or polycarbonate plastic.

7. An air-blown microcable according to claim 6, characterized in that: The model of the optical fiber (2) is G.652, G.654, G.655 or G.

657.

8. An air-blown microcable according to claim 7, characterized in that: A micro sensor and a signal transmission unit are arranged inside the outer protective layer (6).

9. The air-blown microcable according to claim 8, characterized in that: The outer wall of the outer sheath (6) is recessed toward the central reinforcement member (1) at intervals along the length direction of the cable.

10. An air-blown microcable according to claim 9, characterized in that: The buffer layer (4) is made of foam material.

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