Patent Description:
Cable is the main channel for transmitting various signals. With the gradual aging of cables, accompanied by various factors such as accidental construction damage and illegal destruction by personnel, the failure of signal cables is inevitable. Therefore, more and more attention is paid to the detection of cable faults.

In addition, because most of the signal cables are laid in a concealed manner and have a wide range (long distance), it is difficult to find and handle the faults. Once the faults occur, it will inevitably lead to a long delay, seriously affecting the normal transportation order and use safety. There are many disadvantages in the traditional detection methods: the efficiency is low and the detection accuracy is not high in the process of fault repairing. The traditional detection methods are difficult to deal with these disadvantages.

With the vigorous development of engineering construction industry, cables are widely used in roads, mines, subways and railways. As the traditional power supply cables, signal cables and optical fiber cables are laid separately in the construction process, complicated connection makes connection point easy to be damaged, resulting in various problems such as short service life of the cables. However, the damaged part of the cable is easy to be broken down after being used for a long time or being wetted by the environment, which may also lead to short-circuit failure or fire accident in serious cases.

<CIT> discloses an all-dry photoelectric composite cable including a cable core, a sheath assembly surrounding the cable core, and a water blocking layer provided between the cable core and the sheath assembly, and is characterized by: The cable core includes an optical cable unit (<NUM>), a data communication cable unit and a power line unit (<NUM>), and a non-metallic reinforcement (<NUM>) is provided in the cable core, The wire unit is twisted on the periphery of the non-metallic reinforcement.

<CIT> discloses a novel photoelectric composite cable for an indoor wireless distribution system characterized in that it includes two power lines, a data cable, and an optical unit, and the data cable, the optical unit, and an outer periphery formed by twisting two power lines The surface is covered with a polyester tape, the outer periphery of the polyester tape is covered with an outer sheath, the inner cavity of the polyester tape is filled with a filling material, and the data cable is specifically a type <NUM> network cable or a super type <NUM> network cable The light unit includes a flame-retardant sheath and an aramid reinforced ring member with a circular cross section arranged in order from the outside to the inside, and an optical fiber is arranged in an inner cavity of the aramid reinforced ring member.

<CIT> discloses a hybrid or composite cable including a core component and a plurality of buffer tubes positioned around the core component. The core component may include a plurality of twisted pairs of individually insulated conductors and a filling compound positioned between and around the plurality of twisted pairs. The filling compound may have a density of less than approximately <NUM>/cm3 and may further include a plurality of microspheres. Each of the plurality of buffer tubes may be configured to house at least one optical fiber. Additionally, a jacket may be formed around the core component and the plurality of buffer tubes.

<CIT> discloses a cable in which one tube holding light waveguides is connected by a plastic web to another tube holding metallic current carrying conductors. When buried in the earth, the cable may be located by means of a magnetic field produced by the current carrying conductors, but the cable retains the advantage of the tube carrying the light waveguides being dielectric.

<CIT> discloses a power cable or a hybrid power-data cable including power conductors and a plurality of continuity wires positioned radially outside of the power conductors. The continuity wires are positioned relative to the power conductors such that a cut in the cable will sever one of the plurality of continuity wires before a cut into the power conductors can occur.

An objective of the present disclosure is to provide a composite cable for opto-electronic communication, which has the characteristic of high comprehensive performance value.

To achieve the objective above, the present invention employs a composite cable as defined in claim <NUM>.

According to specific embodiments of the present disclosure, the present disclosure has the following technical effects:.

A composite cable for opto-electronic communication is provided by the present disclosure in accordance with claim <NUM>. The optical cable unit, the multiple power line units and the multiple electrical communication line units are arranged inside the sheath. The optical cable unit, the electrical communication line unit and the power line unit are integrated, so that the composite cable has the characteristic of high comprehensive performance value.

To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present disclosure, and those of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

In the drawings:
<NUM>-optical cable unit; <NUM>-power line unit; <NUM>-electrical communication line unit; <NUM>-second water-blocking wrapping tape layer; <NUM>-polyethylene heat insulation layer; <NUM>-third water-blocking wrapping tape layer; <NUM>-aluminum sheath; <NUM>-polyethylene inner sheath; <NUM>-armor layer; <NUM>-polyethylene outer sheath; <NUM>-first filler; <NUM>-optical fiber; <NUM>-second filler; <NUM>-reinforced core; <NUM>-sleeve; <NUM>-copolymer coated aluminum tape; <NUM>-first conductor; <NUM>-first insulating layer; <NUM>-third filler; <NUM>-second conductor; <NUM>-second insulating layer; <NUM>-first water-blocking wrapping tape layer; <NUM>-shielding layer.

The following clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present invention, the scope of the invention being defined by the claims.

In order to make the objectives, technical solutions and advantages of the present disclosure more clearly, the present disclosure is further described in detail below with reference to the embodiments.

<FIG> is a schematic diagram of a sectional structure of a composite cable for opto-electronic communication according to the present disclosure.

As shown in <FIG>, it is provided a composite cable for opto-electronic communication according to Embodiment <NUM> of the present disclosure, including a sheath, an optical cable unit <NUM>, multiple electrical communication line units <NUM>, and multiple power line units <NUM>. The optical cable unit <NUM>, the multiple power line units <NUM> and the multiple electrical communication line units <NUM> are arranged inside the sheath.

<FIG> is a schematic diagram of a sectional structure of an optical cable unit according to the present disclosure.

As shown in <FIG>, the optical cable unit <NUM> includes a copolymer coated aluminum tape <NUM>, a reinforced core <NUM> arranged at the center of the copolymer coated aluminum tape <NUM>, and multiple optical cable subunits which are annularly distributed with the reinforced core <NUM> as the center. Voids of copolymer coated aluminum tape <NUM> are filled with a first filler <NUM>. The reinforced core <NUM> is made of a phosphide steel wire. The optical cable unit <NUM> further includes a first outer sheath made of low-density polyethylene.

Specifically, the optical cable subunit includes a sleeve <NUM>, and multiple optical fibers <NUM> concentrically distributed with the center of the sleeve <NUM> as the center of circle. Each optical fiber <NUM> is a G652D single-mode optical fiber. Voids in the sleeve <NUM> are filled with a second filler <NUM>, and the color of the sleeve <NUM> and the color of the optical fiber <NUM> are according to the total-chromatographic identification method specified in <CIT>.

<FIG> is a schematic diagram of a sectional structure of a power line unit <NUM> according to the present disclosure.

As shown in <FIG>, the power line unit <NUM> includes a first conductor <NUM>, and a first insulating layer <NUM>.

The first insulating layer <NUM> is formed by extruding polyethylene to wrap the outer circumferential surface of the first conductor <NUM>, and is closely attached to the outer circumferential surface of the first conductor <NUM>. The first conductor <NUM> is internally provided with a third filler <NUM>.

The first conductor <NUM> filled in the C3. <NUM> power line unit <NUM> is composed of seven <NUM> annealed copper wires, the first conductor <NUM> is filled with the third filler <NUM>, so as to form a full-section water-blocking structure, that is, the water cannot permeate longitudinally in both the first conductor <NUM> and the first insulating layer <NUM>.

<FIG> is a schematic diagram of a sectional structure of an electrical communication line unit <NUM> according to the present disclosure.

As shown in <FIG>, the electrical communication line unit <NUM> includes a first water-blocking wrapping tape layer <NUM>, multiple line group subunits which are annularly distributed with a center of the first water-blocking wrapping tape layer <NUM> as the center, and a shielding layer <NUM> arranged on and closely attached to the periphery of the first water-blocking wrapping tape layer <NUM>. Voids in the first water-blocking wrapping tape layer <NUM> are filled with the first filler <NUM>.

Specifically, the line group subunit includes a second conductor <NUM>, and a second insulating layer <NUM>.

The second insulating layer <NUM> is arranged on and closely attached to an outer circumferential surface of the second conductor <NUM>.

Specifically, the line group subunit is a physically foamed insulated single wire, the electrical communication line unit <NUM> is formed by four physically foamed insulated single wires in a star-quad manner, and the second conductor <NUM> is made of a flexible bare copper round single wire. The second insulating layer <NUM> is formed by foaming and extruding high-density polyethylene with high-pressure nitrogen, and is tightly coated on the surface of the second conductor <NUM>. Four physically foamed insulated single wires should be identified and distinguished using different colors. a cable core which is formed by four physically foamed insulated single wires in a star-quad manner is wrapped with the first water-blocking wrapping tape layers <NUM>, where the voids between the first water-blocking wrapping tape <NUM> and the physically foamed insulated single wires are filled with the first filler <NUM>, multiple line group subunits which are annularly distributed with the center of the first water-blocking wrapping tape layer <NUM> as the center, and a shielding layer <NUM> arranged at and closely attached to the periphery of the first water-blocking wrapping tape layer <NUM>. The shielding layer <NUM> is formed by wrapping a layer of single-sided aluminum foil, and the voids in the first water-blocking wrapping tape layer <NUM> are filled with the first filler <NUM>. The electrical communication line unit <NUM> further includes a second outer sheath, which is formed by extruding low-density polyethylene.

The executive standard of the electrical communication line unit <NUM> is:.

Specifically, the sheath includes a second water-blocking wrapping tape layer <NUM>, a polyethylene heat insulation layer <NUM>, a third water-blocking wrapping tape layer <NUM>, an aluminum sheath <NUM>, a polyethylene inner sheath <NUM>, an armor layer <NUM>, and a polyethylene outer sheath <NUM> from inside to outside in turn.

Specifically, voids in the second water-blocking wrapping tape layer <NUM> are filled with the third filler <NUM>.

Specifically, a connecting point of the composite cable for opto-electronic communication is connected by means of a fusion tool.

Specifically, the first filler <NUM> is a water-blocking gel, the second filler <NUM> is filling compound for optical fiber, and the third filler <NUM> is cable sealant.

The cable core of the cable is composed of one group of optical cable units <NUM>, two groups of electrical communication units <NUM>, and three groups of power line units <NUM>, and is overlapped and wrapped with a layer of water-blocking wrapping tape as the second water-blocking wrapping tape layer <NUM>. The third filler <NUM> is filled between the cable core composed of one group of optical cable units <NUM>, two groups of electrical communication units <NUM> and three groups of power line units <NUM> and the second water-blocking wrapping tape layer <NUM> as a sealing material. A layer of polyethylene is extruded outside the second water-blocking wrapping tape layer <NUM> as the heat insulation layer <NUM>, and the heat insulation layer <NUM> is overlapped and wrapped with a layer of water-blocking tape as a third water-blocking wrapping tape layer <NUM>. The third water-blocking wrapping tape layer <NUM> is further sleeved with an aluminum sheath <NUM>, a nominal thickness of the aluminum sheath is <NUM>, and the minimum thickness should not be less than <NUM>% of the nominal thickness. A layer of polyethylene inner sheath <NUM> is further extruded outside the aluminum sheath <NUM>, with a thickness of about <NUM>. The thickness, technical requirements and test methods of the polyethylene inner sheath <NUM> conform to the Chinese Standard GB2952. <NUM> Protective coverings for electric cables-Part <NUM>: Protective coverings for cables with metallic sheath. The armor layer <NUM> is wrapped outside the polyethylene inner sheath <NUM>, and the armor layer <NUM> is composed of two layers of galvanized steel strips wrapped with gaps, and the gap of the steel strip is not more than <NUM>% of the strip width, and the gap of the inner steel strip is covered by the part, close to the middle, of the outer steel strip. The technical requirements and test methods of the armor layer <NUM> conform to the Chinese Standard GB2952. <NUM> Protective coverings for electric cables-Part <NUM>: Protective coverings for cables with metallic sheath. A layer of polyethylene outer sheath <NUM> is extruded outside the armor layer <NUM>, with a thickness of about <NUM>. The technical requirements and test methods of the polyethylene outer sheath <NUM> conform to the Chinese Standard GB2952. <NUM> Protective coverings for electric cables-Part <NUM>: Protective coverings for cables with metallic sheath.

After the cable is immersed in water for <NUM> hours, the electrical property of the outer sheath <NUM> conforms to the following requirements:.

The ground insulation resistance is <NUM> V, DC is greater than <NUM> MΩ·km, the electric withstand voltage strength is <NUM> kV, and the outer sheath is free of breakdown after DC for <NUM>.

A bending radius of the cable is <NUM> times the cable diameter (static).

The composite cable for opto-electronic communication provided by the present disclosure has the following beneficial effects:.

Various embodiments in this specification are described in a progressive way, and each embodiment focuses on the differences from other embodiments, so it is only necessary to refer to the same and similar parts between each embodiment.

Claim 1:
A composite cable for opto-electronic communication, comprising a sheath, an optical cable unit (<NUM>), a plurality of electrical communication line units (<NUM>), and a plurality of power line units (<NUM>), wherein the optical cable unit (<NUM>), the plurality of power line units (<NUM>) and the plurality of electrical communication line units (<NUM>) are arranged inside the sheath; wherein the optical cable unit (<NUM>) comprises a copolymer coated aluminum tape (<NUM>), a reinforced core (<NUM>) arranged at the center of the copolymer coated aluminum tape (<NUM>), and a plurality of optical cable subunits which are annularly distributed with the reinforced core (<NUM>) as the center; and voids in the copolymer coated aluminum tape (<NUM>) are filled with a first filler (<NUM>).