Air-blowing micro cable

Abstract

The utility model discloses an air-blowing micro cable in the field of cables, which comprises an outer sheath made of PEEK plastics, a main cable core arranged corresponding to the center of the outer sheath, an inner sheath and a plurality of auxiliary cable cores arranged corresponding to the outer side of the main cable core, and the plurality of auxiliary cable cores twisted on the outer side of the inner sheath by taking the main cable core as the center. The inner sheath is provided with limiting strips protruding outwards corresponding to the position between every two adjacent auxiliary cable cores, the multiple limiting strips are distributed in the length direction of the inner sheath in a spiral shape, fireproof layers are correspondingly arranged between the outer sheath and the auxiliary cable cores, and the positions between the fireproof layers and the inner sheath are filled with water blocking powder. According to the utility model, the problems that the friction coefficient of the outer surface of the air-blowing micro-cable is large and the air-blowing micro-cable is inconvenient to arrange are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cables, and particularly relates to an air-blown micro cable. Background Art

[0002] Micro optical cables are key components of access networks, and their function is to transmit information. The optical transmission indicators of micro optical cables are the same as those of ordinary optical cables. Since their outer diameter is thinner than that of ordinary optical cables, they are referred to as micro cables. Micro optical cables can be installed in tiny pipes through air blowing installation technology without excavating the road surface. They can also be installed in pipes of existing optical cables, saving pipe resources and meeting the real-time expansion needs of the network.

[0003] At present, the outer wall of the air-blown micro-duct on the market is mostly protected by a polyethylene protective layer. The disadvantage is that the protective layer made of polyethylene has a large friction coefficient. When it is laid in the communication pipeline, the outer surface of the air-blown micro-duct has a large friction coefficient. During installation, the air-blown micro-duct will inevitably bend and twist, which will greatly damage the internal optical fiber material and reduce the subsequent communication quality. Utility Model Content

[0004] The utility model aims to provide an air-blown micro-cable, which solves the problem that the outer surface friction coefficient of the air-blown micro-cable is large and it is inconvenient to lay out the air-blown micro-cable.

[0005] The purpose of the utility model is achieved as follows: an air-blown microcable, comprising an outer sheath made of PEEK plastic, a main cable core is arranged at the center of the outer sheath, an inner sheath and a plurality of auxiliary cable cores are arranged on the outside of the main cable core, the plurality of auxiliary cable cores are twisted on the outside of the inner sheath with the main cable core as the center, an outwardly protruding limit strip is arranged between two adjacent auxiliary cable cores of the inner sheath, the plurality of limit strips are spirally distributed along the length direction of the inner sheath, a fireproof layer is arranged between the outer sheath and the auxiliary cable core, and water-blocking powder is filled between the fireproof layer and the inner sheath.

[0006] Compared with the prior art, the utility model has the following beneficial effects: the outer sheath made of PEEK plastic has excellent mechanical properties, high temperature chemical corrosion resistance and electrical insulation properties, can effectively protect the cable core from environmental and mechanical damage, ensure the stability and safety of optical fiber transmission, and PEEK has excellent self-lubricating properties and a low friction coefficient, which effectively reduces the friction between the cable and the pipeline during laying; the limit strip can provide convenient positioning for the auxiliary cable core while avoiding mutual squeezing and wear between the main and auxiliary cable cores; the fireproof layer can reduce the impact of flames on the cable core during combustion, ensuring overall safety; the design with the main cable core as the center and multiple auxiliary cable cores twisted together makes the overall structure compact and has better bending performance.

[0007] As a further improvement of the utility model, Kevlar fiber is also filled between the fireproof layer and the inner sheath.

[0008] As a further improvement of the utility model, the main cable core comprises a main loose tube, a main optical fiber bundle is arranged in the main loose tube, and fiber paste is filled between the main optical fiber bundle and the main loose tube.

[0009] As a further improvement of the utility model, the secondary cable core comprises a secondary loose tube, a secondary optical fiber bundle is arranged in the secondary loose tube, and fiber paste is filled between the secondary optical fiber bundle and the secondary loose tube.

[0010] As a further improvement of the present invention, the main optical fiber bundle and the auxiliary optical fiber bundle are both glass optical fibers.

[0011] As a further improvement of the utility model, the main loose tube and the auxiliary loose tube are both made of PBT material.

[0012] As a further improvement of the utility model, the fireproof layer is a mica tape layer.

[0013] As a further improvement of the utility model, the inner sheath is made of thermoplastic polyurethane elastomer material. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 It is a structural schematic diagram of the inner sheath of the utility model.

[0016] Figure 3 It is a cross-sectional view of the inner sheath of the utility model.

[0017] Among them, 1 outer sheath, 2 main cable core, 201 main loose tube, 202 main optical fiber bundle, 3 inner sheath, 301 limit strip, 4 fiber paste, 5 secondary cable core, 501 secondary loose tube, 502 secondary optical fiber bundle, 6 fireproof layer, 7 water-blocking powder, 8 Kevlar fiber. DETAILED DESCRIPTION

[0018] like Figure 1-3As shown, an air-blown microcable comprises an outer sheath 1 made of PEEK plastic, a main cable core 2 is arranged at the center of the corresponding outer sheath 1, an inner sheath 3 and six auxiliary cable cores 5 are arranged on the outer side of the corresponding main cable core 2; the inner sheath 3 is made of thermoplastic polyurethane elastomer material; the main cable core 2 comprises a main loose tube 201, a main optical fiber harness 202 is arranged in the main loose tube 201, and a fiber paste 4 is filled between the main optical fiber harness 202 and the main loose tube 201; the auxiliary cable core 5 comprises an auxiliary loose tube 501, an auxiliary optical fiber harness 502 is arranged in the auxiliary loose tube 501, and a fiber paste 4 is filled between the auxiliary optical fiber harness 502 and the auxiliary loose tube 501; preferably, the main optical fiber The fiber bundle 202 and the auxiliary optical fiber bundle 502 are both glass optical fibers, and the main loose tube 201 and the auxiliary loose tube 501 are both made of PBT material; the six auxiliary cable cores 5 are twisted on the outside of the inner sheath 3 with the main cable core 2 as the center, and the inner sheath 3 is provided with an outwardly protruding limit strip 301 between two adjacent auxiliary cable cores 5, and the six limit strips 301 are spirally distributed along the length direction of the inner sheath 3, and a fireproof layer 6 is provided between the corresponding outer sheath 1 and the auxiliary cable core 5. Preferably, the fireproof layer 6 is a mica tape layer; water-blocking powder 7 is filled between the fireproof layer 6 and the inner sheath 3, and Kevlar fiber 8 is also filled between the fireproof layer 6 and the inner sheath 3 to increase the overall strength.

[0019] The advantages of the utility model are: the inner sheath 3 made of polyurethane elastomer material has outstanding load-bearing capacity, impact resistance and shock absorption performance, which is sufficient to cope with the bending and twisting of the air-blown cable during laying; a fireproof layer 6 is added outside the cable core to reduce the impact of flames on the cable core during combustion, thereby improving safety; the outer sheath 1 has a smooth surface and is wear-resistant, which can effectively reduce the friction of the air-blown microcable inside the pipeline.

[0020] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present utility model, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. An air-blown microcable, characterized in that: It comprises an outer sheath made of PEEK plastic, a main cable core is arranged at the center of the outer sheath, an inner sheath and a plurality of auxiliary cable cores are arranged on the outside of the main cable core, the plurality of auxiliary cable cores are twisted on the outside of the inner sheath with the main cable core as the center, an outwardly protruding limiting strip is arranged between two adjacent auxiliary cable cores of the inner sheath, the plurality of limiting strips are spirally distributed along the length direction of the inner sheath, a fireproof layer is arranged between the outer sheath and the auxiliary cable cores, and water-blocking powder is filled between the fireproof layer and the inner sheath.

2. The air-blown microcable according to claim 1, characterized in that: Kevlar fibers are also filled between the fireproof layer and the inner sheath.

3. An air-blown microcable according to claim 2, characterized in that: The main cable core comprises a main loose tube, a main optical fiber bundle is arranged in the main loose tube, and fiber paste is filled between the main optical fiber bundle and the main loose tube.

4. The air-blown microcable according to claim 3, characterized in that: The secondary cable core comprises a secondary loose tube, a secondary optical fiber bundle is arranged in the secondary loose tube, and fiber paste is filled between the secondary optical fiber bundle and the secondary loose tube.

5. The air-blown microcable according to claim 4, characterized in that: The main optical fiber bundle and the auxiliary optical fiber bundle are both glass optical fibers.

6. The air-blown microcable according to claim 4, characterized in that: The main loose tube and the auxiliary loose tube are both made of PBT material.

7. The air-blown microcable according to claim 1, characterized in that: The fireproof layer is a mica tape layer.

8. An air-blown microcable according to any one of claims 1 to 7, characterized in that: The inner sheath is made of thermoplastic polyurethane elastomer material.

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