CN210294631U - Air-blowing micro cable - Google Patents

Abstract

The utility model provides an air-blowing micro cable, includes the reinforcement, encircles the cable core and the cladding that the reinforcement set up are in the oversheath outside the cable core, the cable core includes a plurality of loose tubes, loose tube intussuseption is filled with optic fibre and water-blocking substance, the cable core still include with a plurality of filling lines that the transposition of loose tube set up, the filling line be used for according to the core number demand adjustment of optic fibre loose tube's quantity, air-blowing micro cable still includes the flame retardant coating, the flame retardant coating set up in the cable core with between the oversheath. According to the air-blowing micro cable, the fireproof layer is additionally arranged outside the cable core, so that the influence of flame on the cable core during combustion is reduced, and the safety is high; through setting up the filling wire, can set up according to the optic fibre core number demand of reality, adjust the quantity of pine sleeve pipe is suitable for the air-blowing micro cable of multiple different specifications.

Description

Air-blowing micro cable

Technical Field

The utility model relates to a communication cable field especially relates to an air-blowing micro cable.

Background

Compared with the traditional optical cable, the air-blown micro cable has the advantages that the using amount of cabling materials and the processing cost of the micro cable with the same core number are greatly reduced, the structural size is small, the weight is light, and the optical fiber density is high. When being laid, the cable can be directly installed in the existing communication pipeline, so that the pipeline resource is effectively saved, and the construction requirement of network capacity expansion is met. The air-blowing micro cable generally adopts a loose tube layer-stranding structure, the loose tube adopts polybutylene terephthalate (PBT) or modified polypropylene (PP) material, fiber paste is filled in the loose tube for water resistance, and the outer sheath is made of extruded polyethylene or nylon material. The micro cable is laid in an air blowing mode, so that the overall structure of the micro cable is small in size and light in weight. Therefore, the conventional air-blowing micro cable has no flame retardant property, is easy to support combustion under the condition of fire, promotes the fire to expand and spread rapidly, and can further combust and release a large amount of heat and smoke due to the existence of the fiber paste to damage a communication line, so that the human body can be harmed by the large amount of smoke and heat.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for an improved air blown micro cable having flame retardant properties.

The utility model provides an air-blowing micro cable, including reinforcement, encircleing the cable core and the cladding that the reinforcement set up are in the oversheath outside the cable core, the cable core includes a plurality of loose tubes, loose tube intussuseption is filled with optic fibre and water-blocking substance, the cable core still include with a plurality of filling lines that loose tube transposition set up, the filling line be used for according to the core number demand adjustment of optic fibre loose tube's quantity, air-blowing micro cable still includes the flame retardant coating, the flame retardant coating set up in the cable core with between the oversheath.

Furthermore, water-blocking yarns are filled between the cable core and the reinforcing piece, and the cable core is wound by binding yarns.

Furthermore, the outer sheath has a wall thickness of 0.4-0.8 mm and an outer diameter of 5.8-6.8 mm.

Further, the loose tube is the same size as the fill line.

Furthermore, the thickness of the fireproof layer is 0.2 mm-0.4 mm.

Further, the number of cores of the optical fibers filled in the loose tube is 6-24 cores.

Furthermore, the fireproof layer is longitudinally wrapped or wrapped outside the cable core, and the number of layers of the longitudinal wrapping or the wrapping is single-layer or multi-layer.

Further, the reinforcing part is a non-metal reinforced plastic rod made of a non-metal material, the tensile strength of the non-metal reinforced plastic rod is greater than 1100MPa, and the elastic modulus of the non-metal reinforced plastic rod is greater than 55 GPa.

Furthermore, the surface of the reinforcement is provided with a plastic coating, and the thickness of the plastic coating is 0.2 mm-0.4 mm.

Furthermore, the air-blowing micro cable further comprises a tearing rope, wherein the tearing rope is arranged between the fireproof layer and the outer sheath and used for facilitating stripping of the outer sheath.

According to the air-blowing micro cable, the fireproof layer is additionally arranged outside the cable core, so that the influence of flame on the cable core during combustion is reduced, and the safety is high; through setting up the filling wire, can set up according to the optic fibre core number demand of reality, adjust the quantity of pine sleeve pipe is suitable for the air-blowing micro cable of multiple different specifications.

Drawings

Fig. 1 is a schematic structural view of an air-blowing micro cable according to an embodiment of the present invention.

Description of the main elements

The following detailed description of the invention will be further described in conjunction with the above-identified drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

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 this invention belongs. 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 the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, the air-blowing micro cable 100 shown in fig. 1 is used for being laid in a communication pipeline for information transmission, and includes, in order from inside to outside, a reinforcement 10, a loose tube 20 and a filling line 30 arranged around the reinforcement 10, a fire-retardant layer 40, and an outer sheath 50.

The strength member 10 is disposed at a central position of the air-blowing micro cable 100 for providing a central supporting function to provide support for the loose tube 20 and the filling line 30 disposed outside the strength member 10. The central reinforcing member 10 may be made of a material having a certain strength. In one embodiment, the stiffener 10 is a non-metallic reinforced plastic rod made of a non-metallic material, which may be a fiber reinforced composite material such as CFRP, GFRP, AFRP, BFRP, or the like. The FRP composite material is a high-performance material formed by mixing a fiber material and a matrix material (resin) according to a certain proportion, is light and hard, is non-conductive, has high mechanical strength and is corrosion-resistant. The tensile strength of the non-metal reinforced plastic rod made of the non-metal material is more than 1100MPa, and the elastic modulus is more than 55 GPa. In other embodiments, the reinforcing member 10 is formed by twisting steel wires or other equivalent reinforcing materials, for example, by twisting steel wires in multiple layers, wherein the number of twisted layers may be 1 layer, 2 layers, or 3 layers or more, and can be set according to the strength requirement. In one embodiment, the reinforcement 10 is further provided with a plastic coating layer, wherein the plastic coating layer is made of low-smoke halogen-free flame-retardant polyolefin and has a thickness of 0.2mm to 0.4 mm.

The loose tube 20 and the filling wire 30 are arranged at the periphery of the reinforcing part 10 in a layer-twisted manner to form a cable core of the air-blowing micro cable 100, a gap between the loose tube 20 and the reinforcing part 10 is filled with water blocking yarns 31, and the cable core is wound by binding yarns to ensure the roundness of the cable core. In one embodiment, the cable core is formed by twisting 4 loose tubes 20 and 2 filling wires 30, and each loose tube 20 is provided with a 12-core optical fiber. In an embodiment, the cable core is formed by twisting 6 to 24, in order to ensure the twisting effect, the number of the loose tubes 20 and the number of the filling wires 30 can be set according to the actual requirement of the number of the optical fiber cores, the number of the loose tubes 20 is adjusted by using the filling wires 30, when the requirement of the number of the optical fiber cores is large, the loose tubes 20 with the same specification can be used for replacing the filling wires 30, and when the requirement of the number of the optical fiber cores is small, the filling wires 30 with the same specification can be used for replacing the loose tubes 20. In one embodiment, the cable core can also adopt a double-layer twisting mode to increase the number of optical fiber cores to 24-288 cores. In one embodiment, the binder yarns are made of a low linear density aramid material.

The loose tube 20 is formed by extrusion molding of a flame retardant material. In one embodiment, the loose tube 20 is made of a low-smoke halogen-free flame-retardant polyolefin material, the oxygen index of the loose tube 20 is greater than 32%, and the maximum specific optical density during flaming combustion is less than 80. In other embodiments, the loose tube can also adopt a high-performance flame-retardant PBT or flame-retardant PP material.

The loose tube 20 is filled with an optical fiber 21 and a water blocking substance (not numbered). In one embodiment, the loose tube 20 is filled with 12 cores of the optical fiber 21, and the coating diameter of the optical fiber 21 is 245 to 255 μm. In other embodiments, the optical fiber 21 may be a small-sized optical fiber having a coating diameter of 180 μm to 200 μm to reduce the size of the loose tube 20. Wherein the type of the optical fiber 21 can be G.652, G.657 optical fiber, the number of the cores of the optical fiber 21 in each loose tube 20 can be 6-24 cores. The water blocking substance is filled in the loose tube 20 to perform dry water blocking. In one embodiment, the water-blocking substance is a water-blocking yarn. In other embodiments, the water-blocking substance may be a low heating value and low smoke generating flame retardant paste or powder.

The filling line 30 is formed by extrusion molding of low-smoke halogen-free flame-retardant polyolefin materials, the oxygen index of the materials is greater than 32%, the maximum specific optical density during flaming combustion is less than 60, and the specification and the size of the filling line 30 are consistent with those of the loose tube 20.

The fire-proof layer 40 is coated outside the cable core composed of the loose tube 20 and the filling line 30. In one embodiment, the fire-proof layer 40 is a longitudinal wrapping or a lapping wrapping made of a polyimide film, the number of layers of the longitudinal wrapping or the lapping wrapping is a single layer or multiple layers, the thickness of the layers is 0.2 mm-0.4 mm, and the lap joint width of the layers is 2 mm-4 mm. In other embodiments, the fire-proof layer 40 is longitudinally wrapped or wrapped with mica tapes or non-metal woven tapes, and the number of the longitudinal wrapping or wrapping layers is single or multiple.

The outer jacket 50 is extruded over the flame retardant layer 40. In one embodiment, the outer sheath 50 is made of a high performance low smoke halogen-free flame retardant polyolefin material, has an oxygen index greater than 36%, and has a maximum specific optical density less than 60 during flaming combustion. In other embodiments, the outer sheath 50 is made of low-friction low-smoke halogen-free flame-retardant polyolefin material, such as low-friction LSZH or low-friction flame-retardant PE, the outer sheath 50 may also be made of flame-retardant nylon material, and the material used for the outer sheath 50 has low flame spread rate, low combustion heat release amount, and small smoke amount when on fire. In one embodiment, the 48-core air-blown micro-cable 100 has a wall thickness of 0.4mm to 0.8mm for the outer sheath 50, and an outer diameter of 5.8mm to 6.8mm for the air-blown micro-cable 100, which can be laid in a sub-tube with a size of 10mm/8 mm.

The air-blowing micro cable 100 further comprises a tearing rope 60, wherein the tearing rope 60 is arranged between the outer sheath 50 and the fireproof layer 40 and is used for facilitating the stripping of the outer sheath 50.

The air-blowing micro-cable loose tube, the outer sheath and the necessary filling materials are all made of low-smoke high-flame-retardant materials, and the fireproof layer is added outside the cable core, so that the influence of flame on the cable core during combustion is reduced, and the safety is high; the full-dry structural design is adopted, combustion supporting of the filled fiber paste under the condition of fire is avoided, a large amount of heat and smoke are released, the ointment does not need to be cleaned when the optical fibers are connected, and the installation cost of the optical cable is reduced.

It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be taken as limiting the present invention, and that suitable modifications and variations of the above embodiments are within the scope of the invention as claimed.

Claims (10)

1. The utility model provides an air-blowing micro cable, includes the reinforcement, encircles the cable core and the cladding that the reinforcement set up are in the oversheath outside the cable core, the cable core includes a plurality of pine sleeve pipes, the intussuseption of pine sleeve pipe is filled with optic fibre and water-blocking material, its characterized in that: the air-blowing micro cable further comprises a fireproof layer, and the fireproof layer is arranged between the cable core and the outer sheath.

2. The air-blown micro-cable of claim 1, wherein: and water-blocking yarns are filled between the cable core and the reinforcing piece, and the cable core is wound by binding yarns.

3. The air-blown micro-cable of claim 1, wherein: the outer sheath has a wall thickness of 0.4-0.8 mm and an outer diameter of 5.8-6.8 mm.

4. The air-blown micro-cable of claim 1, wherein: the loose tube is the same size as the fill line.

5. The air-blown micro-cable of claim 1, wherein: the thickness of the fireproof layer is 0.2 mm-0.4 mm.

6. The air-blown micro-cable of claim 1, wherein: the number of the cores of the optical fibers filled in the loose tube is 6-24.

7. The air-blown micro-cable of claim 1, wherein: the fireproof layer is longitudinally wrapped or wrapped outside the cable core, and the number of layers of the longitudinal wrapping or the wrapping is single-layer or multi-layer.

8. The air-blown micro-cable of claim 1, wherein: the tensile strength of the reinforcing member is more than 1100MPa, and the elastic modulus is more than 55 GPa.

9. The air-blown micro-cable of claim 1, wherein: the surface of the reinforcement is provided with a plastic coating, and the thickness of the plastic coating is 0.2 mm-0.4 mm.

10. The air-blown micro-cable of claim 1, wherein: the air-blowing micro cable further comprises a tearing rope, wherein the tearing rope is arranged between the fireproof layer and the outer sheath and used for facilitating stripping of the outer sheath.

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