CN211603653U - Optical fiber composite overhead ground wire - Google Patents

Abstract

The utility model discloses a compound overhead earth wire of optic fibre, including built-in optical cable, the outer parcel of built-in optical cable has the cavity to support the core, the outer transposition of cavity support core has many aluminium package steel single lines. The utility model provides high optical fiber unit water blocking performance among the compound overhead earth wire of optic fibre, expand communication capacity, resistant thunderbolt and improve the compound overhead earth wire life-span of optic fibre.

Description

Optical fiber composite overhead ground wire

Technical Field

The utility model relates to a compound line especially relates to a compound overhead earth wire of optic fibre.

Background

The optical fiber composite overhead ground wire (OPGW) has a function of transmitting an optical signal through an optical fiber unit in addition to a function of a ground wire.

The traditional optical fiber composite overhead ground wire is divided into three structures of a layer-twisted type, a central tube type and an aluminum framework type. The aluminum skeleton type optical fiber composite overhead ground wire is rarely applied in the market due to higher production cost. The optical fiber composite overhead ground wire mainly adopts the layer-stranding type and central tube type application as the main application. The layer-stranded optical fiber composite overhead ground wire is prepared by matching the stainless steel tube optical fiber unit with a single wire and participating in the stranding of the single wire, and the optical fiber composite overhead ground wire is ensured not to be stressed in the use process through the primary extra length of the optical fiber unit and the secondary extra length introduced in the stranding process. However, the stainless steel tube optical fiber unit needs to be matched with a single wire in size to accommodate a small number of optical fibers, so that the communication capacity is limited, and if welding spots are leaked in the stainless steel tube optical fiber unit, the tube and the fibers are easily broken in the twisting process. The optical fiber in the stainless steel tube optical fiber unit can only be protected by the outer stainless steel tube and the fiber paste, once the stainless steel tube is corroded and has a defect, the optical fiber in the fiber paste dripping flow is damped to generate a water absorption peak, and the optical signal transmission performance can be greatly reduced. The central line of the central tube type optical fiber composite overhead ground wire is replaced by an aluminum tube or an aluminum-clad stainless steel tube type optical fiber unit, the normal transmission of the optical fiber is ensured only by controlling the one-time extra length of the optical fiber unit, and the attenuation increase of the optical fiber caused by stress is avoided. The structure is mainly applied to the optical fiber composite overhead ground wire matched with the small-section ground wire. The central tube type optical fiber composite overhead ground wire has limited communication capacity because only an optical fiber unit matched with the central line can be provided.

Therefore, the technical personnel in the field are dedicated to develop an overhead composite ground wire, which can improve the water-blocking performance of the optical fiber units in the optical fiber composite overhead ground wire, expand the communication capacity, resist lightning stroke and prolong the service life of the optical fiber composite overhead ground wire.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defect of prior art, the utility model aims to solve the technical problem that a compound overhead earth wire of optic fibre is provided, improve the compound overhead earth wire of optic fibre in the optic fibre unit performance of blocking water, expand communication capacity, resistant thunder strike and improve the compound overhead earth wire life-span of optic fibre.

In order to achieve the above object, the utility model provides a compound overhead earth wire of optic fibre, including built-in optical cable, the outer parcel of built-in optical cable has the cavity to support the core, the outer transposition of cavity support core has many aluminium package steel single lines. The hollow supporting core is of a hollow structure, optical fibers are arranged in the hollow structure, and the optical fibers do not participate in stranding, so that the optical fibers are effectively protected.

Furthermore, the hollow support core is formed by splicing and twisting a plurality of support pieces, the cross sections of the support pieces are corrugated, convex parts and concave parts are respectively arranged at opposite corners of the corrugations, the convex parts are matched with the concave parts of the adjacent support pieces, and the concave parts are matched with the convex parts of the adjacent support pieces. The sealing performance is better by means of mechanical engagement of the structure of the supporting piece.

Furthermore, the built-in optical cable comprises at least one loose tube unit, the loose tube unit comprises at least one bare fiber, an inner sheath wraps the bare fiber, and hydrogen absorption fiber paste is filled between the bare fiber and the inner sheath. The hydrogen absorption fiber paste can block water by hydrophobicity, prevents water from entering, has longitudinal water blocking performance, and protects the built-in bare optical fiber.

Furthermore, a mica tape is wound between the hollow supporting core and the loose tube unit, and the thickness of the mica tape is 0.1-0.2 mm. The mica tape can isolate the optical fiber unit from high-temperature damage in a short time when the optical fiber composite overhead ground wire bears lightning stroke or short-circuit current, and the service life of the optical fiber is prolonged.

Furthermore, a water blocking tape and aramid yarns are sequentially wound between the loose tube unit and the mica tape.

Further, an outer sheath is wrapped outside the mica tape.

Further, the thickness of the water-blocking tape is 0.1 mm-0.15 mm. The water blocking tape is arranged in the hollow supporting core, so that the water blocking performance is improved, and the built-in bare fiber is protected.

Furthermore, the thickness of the aramid yarn is 0.1-0.2 mm. The aramid yarn improves the tensile strength of the built-in optical cable, and in addition, the aramid yarn can play a buffering role between the water blocking tape and the mica tape, so that the water blocking tape and the fire-resistant mica tape are prevented from being deformed asynchronously and worn when the optical fiber is bent and deformed.

Furthermore, the outer sheath is made of low-smoke halogen-free flame-retardant polyethylene material, and the thickness of the outer sheath is 0.2 mm-0.3 mm. The sheath is directly extruded on the mica tape, can bear high temperature in a short time and protect the mica tape and the inner layer structure.

The utility model has the advantages that: the utility model has a twisted hollow supporting core, a built-in optical cable is arranged in the hollow supporting core, and an aluminum-clad steel single wire is twisted outside the hollow supporting core, the utility model can simultaneously realize signal transmission and protect the overhead conductor, and a closed twisted hollow cavity is formed by mechanical meshing of specific structures between supporting pieces to form a first water-blocking structure; the supporting pieces are not tightly pressed, and only aluminum-clad steel single wires are twisted and formed outside the hollow supporting core, so that the flexibility of the overhead ground wire is improved; the hollow support core is internally provided with a water blocking tape and a hydrogen absorption fiber paste, the water blocking tape blocks water in the radial direction, the hydrogen absorption fiber paste blocks water in the longitudinal direction, and the water blocking tape and the hydrogen absorption fiber paste form a second water blocking structure together, so that the water blocking performance of the optical fiber in the overhead ground wire is improved; can set up many optic fibres in the support core, expand communication capacity, the aluminium package steel single line of transposition guarantees the resistant thunderbolt of overhead earth wire, improves the life-span of the compound overhead earth wire of optic fibre, compares traditional compound overhead line, the utility model discloses have good water blocking and resistant thunderbolt performance, the regional use of suitable thunder and lightning.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an internal optical cable according to an embodiment of the present invention.

Fig. 3 is a schematic structural view of a hollow support core according to an embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples, wherein it is noted that, in the description of the invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular manner, and therefore should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected" and "connected" are to be understood broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or connected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 3, a composite overhead ground wire includes an internal optical cable 8, where the internal optical cable 8 includes at least one bare fiber 1, the bare fiber 1 may adopt a common G652B optical fiber, the external of the internal optical cable 8 is wrapped with a hollow support core 9, the hollow support core 9 is formed by splicing and twisting a plurality of supports 901, the cross section of the support 901 is corrugated, and the corrugated diagonal corners respectively have a convex portion and a concave portion, the convex portion is matched with the concave portion of the adjacent support 901, and the concave portion is matched with the convex portion of the adjacent support 901. The supporting member 901 is integrally in a Z shape, and the hollow supporting core 9 is formed by drawing a round copper rod into a Z-shaped wire through a plurality of wire drawing dies which are round and gradually changed into the Z shape, and then twisting the wire drawing dies. If the diameter of the Z-shaped single wire is too large, the drawing force is large and difficult to realize by adopting a drawing die, rolling forming can be performed by adopting a method of rolling a plurality of pairs of jade which is round and gradually changed into Z-shaped, and a plurality of aluminum-clad steel single wires 10 are stranded outside the hollow support core 9.

There is mica tape 6 around the package between cavity support core 9 and the loose tube unit 11, and the thickness of mica tape 6 is 0.1mm ~ 0.2mm, and in this embodiment, the thickness of mica tape 6 is 0.15mm, and the thickness of mica tape 6 adopts 0.11mm, 0.12mm, 0.18mm, 0.2mm in other embodiments also can reach the utility model discloses the effect.

An inner sheath 3 is wrapped outside the bare fiber 1, and hydrogen absorption fiber paste 2 is filled between the bare fiber 1 and the inner sheath 3. And a water-blocking tape 4 and aramid yarns 5 are sequentially wound between the loose tube unit 11 and the mica tape 6. The thickness of the water-blocking tape 4 is 0.1 mm-0.15 mm, in this embodiment, the thickness of the water-blocking tape 4 is 0.12mm, and the thickness of the water-blocking tape 2 in other embodiments adopts 0.11mm, 0.13mm, 0.14mm, 0.15mm to reach the effect of the utility model.

Aramid yarn 5's thickness is 0.1mm ~ 0.2mm, and in this embodiment, aramid yarn 5's thickness is 0.15mm, and aramid yarn 5's thickness adopts 0.11mm, 0.12mm, 0.18mm, 0.2mm also can reach in other embodiments the utility model discloses the effect. The aramid yarn 5 can improve the tensile strength of the built-in optical cable, and the aramid yarn 5 can play a buffering role between the water blocking tape 4 and the mica tape 6, so that the water blocking tape 4 and the fire-resistant mica tape 6 are prevented from being deformed and abraded asynchronously when the bare optical fiber bends 1 to deform. The mica tape 6 can isolate the optical fiber unit from high-temperature damage in a short time when the composite ground wire bears lightning stroke or short-circuit current.

An outer sheath 7 wraps the mica tape 6, the outer sheath 7 is made of low-smoke halogen-free flame-retardant polyethylene, the outer sheath 7 can bear high temperature for a short time, and the thickness of the outer sheath 7 is 0.2 mm-0.3 mm. In this embodiment, the thickness of oversheath 7 is 0.25mm, and the thickness of oversheath 7 adopts 0.21mm, 0.23mm, 0.24mm, 0.28mm, 0.3mm also can reach in other embodiments the utility model discloses the effect.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims (9)

1. An optical fiber composite overhead ground wire is characterized in that: the cable comprises a built-in optical cable (8), a hollow supporting core (9) is wrapped outside the built-in optical cable (8), and a plurality of aluminum-clad steel single wires (10) are stranded outside the hollow supporting core (9).

2. The optical fiber composite overhead ground wire of claim 1, wherein: the hollow supporting core (9) is formed by splicing and twisting a plurality of supporting pieces (901);

the cross section of the support piece (901) is corrugated, and the opposite corners of the corrugations are respectively provided with a convex part and a concave part, the convex part is matched with the concave part of the adjacent support piece (901), and the concave part is matched with the convex part of the adjacent support piece (901).

3. The optical fiber composite overhead ground wire of claim 1, wherein: the built-in optical cable (8) comprises at least one loose tube unit (11);

the loose tube unit (11) comprises at least one bare fiber (1), an inner sheath (3) wraps the bare fiber (1), and hydrogen absorption fiber paste (2) is filled between the bare fiber (1) and the inner sheath (3).

4. The optical fiber composite overhead ground wire of claim 3, wherein: a mica tape (6) is wound between the hollow supporting core (9) and the loose tube unit (11), and the thickness of the mica tape (6) is 0.1-0.2 mm.

5. The optical fiber composite overhead ground wire of claim 4, wherein: and a water blocking tape (4) and aramid yarns (5) are sequentially wound between the loose tube unit (11) and the mica tape (6).

6. The optical fiber composite overhead ground wire of claim 4, wherein: the mica tape (6) is wrapped by an outer sheath (7).

7. The optical fiber composite overhead ground wire of claim 5, wherein: the thickness of the water-blocking tape (4) is 0.1 mm-0.15 mm.

8. The optical fiber composite overhead ground wire of claim 5, wherein: the thickness of the aramid yarn (5) is 0.1-0.2 mm.

9. The optical fiber composite overhead ground wire of claim 6, wherein: the outer sheath (7) is made of low-smoke halogen-free flame-retardant polyethylene material, and the thickness of the outer sheath (7) is 0.2 mm-0.3 mm.

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