CN111175922A - Large-load flat all-dielectric self-supporting optical cable - Google Patents

Abstract

The invention provides a large-load flat all-dielectric self-supporting optical cable, which comprises: the device comprises a plurality of light units arranged in parallel, a protective layer coated around the light units, a flat sheath tightly coated around the light units and the protective layer, and a plurality of reinforcing beams clamped in the flat sheath; in the flat sheath, the light units and the protective layers thereof are positioned in the middle in the longitudinal direction and are distributed at intervals in the transverse direction; the multiple reinforcing bundles are arranged in an upper row and a lower row, are axially arranged in parallel and are transversely distributed at intervals. The large-load flat full-medium self-supporting optical cable provided by the invention adopts a structure that a plurality of aramid fiber bundles are arranged into two rows, so that the contact surface area of the aramid fiber and the sheath is increased, the adhesive force between the aramid fiber and the sheath is increased, the defect that the aramid fiber is difficult to bear force simultaneously due to layered sliding is avoided, the large-load bearing function is easy to realize, and the use safety of ADSS is greatly improved.

Description

Large-load flat all-dielectric self-supporting optical cable

Technical Field

The invention belongs to the field of optical fiber cables, and particularly relates to a large-load flat type all-dielectric self-supporting optical cable.

Background

An all-dielectric self-supporting optical cable (ADSS) is a common overhead optical cable for power transmission lines, and has a structure of a central tube type or layer-stranded circular optical unit, wherein 1-3 layers of aramid fibers are stranded around the optical unit to serve as a reinforcing member, and an outer sheath is a polyolefin sheath or a tracking-resistant polyolefin sheath. On one hand, due to the limitation of the optical cable structure and the rotational aramid fiber processing equipment, when the Rated Tensile Strength (RTS) of the ADSS is close to about 80kN, usually three or more layers of aramid fibers are needed, and when the bearing capacity is large, the aramid fibers are easy to be broken in a layered mode due to the fact that all layers of aramid fibers cannot be stressed consistently, and the optical cable is damaged; on the other hand, the sheath is not matched with the aramid fiber bearing capacity due to the fact that the contact surface area of the sheath and the aramid fiber is small, the adhesive force is small, and the sheath is pulled to break by a hardware fitting, and finally the optical cable is pulled to break. Due to the defects, the ADSS optical cable with the circular structure cannot bear excessive load tension, and the application range of the ADSS in large-span power transmission lines is limited. In addition, with the further development of the smart grid, the problems of capacity expansion and reconstruction of the line, replacement of a novel optical fiber and the like occur, and the preset optical fiber micro-tube is a reserved space for subsequent capacity expansion and updating of the optical fiber, and becomes a new direction for research and development.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a large-load flat all-dielectric self-supporting optical cable which can meet the application environment requirement of a large-span power transmission line. The technical scheme adopted by the invention is as follows:

a high-load flat all-dielectric self-supporting optical cable comprising: the device comprises a plurality of light units arranged in parallel, a protective layer coated around the light units, a flat sheath tightly coated around the light units and the protective layer, and a plurality of reinforcing beams clamped in the flat sheath;

in the flat sheath, the light units and the protective layers thereof are positioned in the middle in the longitudinal direction and are distributed at intervals in the transverse direction; the multiple reinforcing bundles are arranged in an upper row and a lower row, are axially arranged in parallel and are transversely distributed at intervals.

Further, two rows of reinforcing beams are respectively positioned on the upper half part and the lower half part of the flat sheath in the longitudinal direction.

Further, the reinforcing beams, the light units and the protective layers thereof are alternately distributed at intervals in the transverse direction in the flat sheath; and the reinforcing beams are distributed at the two sides of the flat sheath.

Further, the optical unit comprises an optical fiber arranged in an optical fiber outer tube, and the optical fiber outer tube is filled with fiber paste for coating the optical fiber; and/or an empty outer fiber tube.

Further, the optical fiber outer tube adopts a PBT tube.

Further, the light unit is arranged axially parallel to the reinforcing beam.

Further, the number of the light units is at least 2; the number of said reinforcing strands is at least 6.

Further, the protective layer is one or more of aramid fiber, belting, binding yarn or rubber and plastic elastomer and a combination thereof.

Furthermore, the reinforcing beam is aramid fiber beam.

Further, the flat sheath is made of weather-resistant polyolefin or weather-resistant and anti-tracking polyolefin sheath material.

The invention has the advantages that:

1) the large-load flat full-medium self-supporting optical cable provided by the invention adopts a structure that a plurality of aramid fiber bundles are arranged into two rows, so that the contact surface area of the aramid fiber and the sheath is increased, the adhesive force between the aramid fiber and the sheath is increased, the defect that the aramid fiber is difficult to bear force simultaneously due to layered sliding is avoided, the large-load bearing function is easy to realize, and the use safety of ADSS is greatly improved.

2) The optical unit can be a PBT tube containing a plurality of optical fibers and fiber paste, and can also be a preset optical fiber micro-tube for the blowing optical fiber, thereby being beneficial to optical fiber replacement, capacity expansion and the like.

3) The flat optical cable structure enlarges the contact area between the optical cable and the hardware fitting, reduces the local stress and deformation of the contact part between the optical cable and the hardware fitting or an iron tower and the like when the optical cable bears a large load, and increases the reliability of the optical cable.

Drawings

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

Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a light unit according to the present invention.

Detailed Description

The invention is further illustrated by the following specific figures and examples.

The embodiment of the invention provides a large-load flat all-dielectric self-supporting optical cable, which comprises: a plurality of light units 1 which are placed in parallel, a protective layer 2 which is coated around the light units 1, a flat sheath 3 which is tightly coated around the light units 1 and the protective layer 2, and a plurality of reinforced beams 4 which are clamped in the flat sheath 3;

in fig. 1 and 2, the vertical direction is the longitudinal direction, the horizontal direction is the lateral direction, and the direction perpendicular to the paper surface is the axial direction;

in the flat sheath 3, the light unit 1 and the protective layer 2 thereof are positioned in the middle in the longitudinal direction and distributed at intervals in the transverse direction; the plurality of reinforcing beams 4 are arranged in an upper row and a lower row, are axially arranged in parallel and are transversely distributed at intervals;

preferably, the two rows of reinforcing beams 4 are respectively positioned at the upper half part and the lower half part of the flat sheath 3 in the longitudinal direction, so as to obtain more balanced mechanical properties;

preferably, the reinforcing beams 4 are alternately spaced in the transverse direction from the light units 1 and their protective layers 2 in the flat sheath 3; and the reinforcing bundles 4 are distributed at the two sides of the flat sheath 3;

fig. 1 and 2 show two specific embodiment configurations, differing in the number of light units 1 and their protective layers 2, the number of reinforcing bundles 4, while the cable configuration is similar;

in some embodiments, the optical unit 1 includes an optical fiber 11 disposed in an optical fiber outer tube 13, and the optical fiber outer tube 13 is filled with a fiber paste 12 covering the optical fiber 11, as shown in fig. 3; in other embodiments, the light unit 1 may further include an empty optical fiber outer tube 13, which may be a preset optical fiber micro-tube; the optical fiber outer tube 13 is preferably a PBT tube;

in some embodiments, the light unit 1 is arranged axially parallel to the reinforcing beam 4;

in some embodiments, the number of light units 1 is at least 2;

in some embodiments, the number of said reinforcing beams 4 is at least 6;

in some embodiments, the protective layer 2 is one or more of aramid or tape or binder yarn or rubber-plastic elastomer, and combinations thereof; for example, in the structure of fig. 1, the protective layer 2 is a combination of aramid and rubber-plastic elastomer; in the structure of fig. 2, the protective layer 2 is aramid;

in some embodiments, the reinforcing strands 4 are aramid strands;

in some embodiments, the flat sheath 3 is made of a weather-resistant polyolefin or a weather-resistant and tracking-resistant polyolefin sheath material.

The large-load flat all-dielectric self-supporting optical cable provided by the embodiment of the invention has the following characteristics:

1) the structure of adopting stranded aramid fiber bundle has increased the adhesive force of aramid fiber and sheath, makes the function of big load bearing realize easily.

2) Besides placing optical fibers, the optical unit can also be a preset optical fiber micro-tube for the blowing optical fiber, thereby being beneficial to replacing and expanding the optical fibers and the like.

3) The flat optical cable structure can reduce local stress and deformation of contact parts of the optical cable and hardware fittings or an iron tower and the like when the optical cable bears a large load.

To sum up, compared with the round full-medium self-supporting optical cable (ADSS) which has been used for a long time, the large-load flat full-medium self-supporting optical cable provided by the embodiment of the invention has large bearing capacity, effectively reduces the local stress and deformation of the optical cable, can be provided with optical fiber micro-tubes in advance, is suitable for large-span and large-load power transmission lines, and expands the application range of the full-medium self-supporting optical cable.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims (10)

1. A large-load flat all-dielectric self-supporting optical cable is characterized by comprising: the device comprises a plurality of light units (1) which are placed in parallel, a protective layer (2) which is coated around the light units (1), a flat sheath (3) which is tightly coated around the light units (1) and the protective layer (2), and a plurality of reinforcing beams (4) which are clamped in the flat sheath (3);

in the flat sheath (3), the light units (1) and the protective layers (2) thereof are positioned in the middle in the longitudinal direction and are distributed at intervals in the transverse direction; the multiple reinforcing beams (4) are arranged in an upper row and a lower row, are axially arranged in parallel and are transversely distributed at intervals.

2. The high-load flat all-dielectric self-supporting optical cable of claim 1,

the two rows of reinforcing beams (4) are respectively positioned on the upper half part and the lower half part of the flat sheath (3) in the longitudinal direction.

3. The high-load flat all-dielectric self-supporting optical cable of claim 1,

the reinforcing beams (4) in the flat sheath (3) are alternately distributed with the optical unit (1) and the protective layer (2) thereof at intervals in the transverse direction; and the reinforcing beams (4) are distributed at the two sides of the flat sheath (3).

4. The high-load flat all-dielectric self-supporting optical cable of claim 1,

the optical unit (1) comprises an optical fiber (11) arranged in an optical fiber outer tube (13), and the optical fiber outer tube (13) is filled with fiber paste (12) for coating the optical fiber (11); and/or an empty outer fiber tube (13).

5. The high-load flat all-dielectric self-supporting optical cable of claim 4,

the optical fiber outer tube (13) adopts a PBT tube.

6. The high-load flat all-dielectric self-supporting optical cable of claim 1,

the light unit (1) and the reinforcing beam (4) are arranged in parallel in the axial direction.

7. The high-load flat all-dielectric self-supporting optical cable of claim 1,

the number of the light units (1) is at least 2; the number of said reinforcing strands (4) is at least 6.

8. The high-load flat all-dielectric self-supporting optical cable of claim 1,

the protective layer (2) is one or more of aramid fiber, belting, binding yarn or rubber-plastic elastomer and a combination thereof.

9. The high-load flat all-dielectric self-supporting optical cable of claim 1,

the reinforcing beam (4) is made of aramid fiber.

10. The high-load flat all-dielectric self-supporting optical cable of claim 1,

the flat sheath (3) is made of weather-proof polyolefin or weather-proof and anti-electric mark polyolefin sheath material.

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