CN209766054U - Environment-friendly flame-retardant overhead insulated cable - Google Patents

Abstract

the utility model relates to an environment-friendly flame-retardant overhead insulated cable, the cable is single wire structure or many wire transposition structure, single wire includes the conductor, the conductor is the round transposition conductor that sticiss that aluminium or aluminum alloy material made through sticising the technology, and the conductor outside cladding has fire-retardant insulating layer, and the insulating layer adopts low smoke low halogen fire-retardant crosslinked polyolefin to make; when the cable is in a multi-conductor twisted structure, ridge lines are arranged on the outer surface of the insulating layer of each conductor, the number of the ridge lines is sequentially arranged from 1 to n, digital codes corresponding to the number of the ridge lines are sprayed and printed on the insulating layer, and the twisted pitch of the cable is smaller than 40 times of the outer diameter of a single conductor. The utility model discloses cable environmental protection economy, fire behaviour is good to greatly reduced flame retarded cable cost and external diameter, the practicality is strong, is suitable for using widely.

Description

Environment-friendly flame-retardant overhead insulated cable

Technical Field

The utility model belongs to the technical field of the cable application technique and specifically relates to a fire-retardant aerial insulated cable of environment-friendly.

Background

In rural areas or partial urban low-voltage power grids, bare wires such as uninsulated steel-cored aluminum stranded wires or aluminum stranded wires are generally adopted as power grid transmission lines. The uninsulated bare conductor is easy to contact with people or objects, so that the tripping of a power grid line is easy to cause even safety accidents, and the tripping of the power grid causes large-area power failure to generate economic loss.

In the prior art, an overhead cable with insulation is adopted in the low-voltage power grid. The commonly used low-voltage overhead insulated cable meets the regulations of GB/T12527-2008 'overhead insulated cable with rated voltage of 1kV and below'. According to the specification of GB/T12527-2008 standard, the insulating materials of the overhead insulated cable are divided into: polyvinyl chloride, polyethylene or cross-linked polyethylene insulation. The polyvinyl chloride insulating material has certain flame retardance, but the flame retardance of a plurality of cables is poor when the cables are combined together, and the cables are easy to generate larger smoke and toxic gas when being burnt, so that the polyvinyl chloride insulating material is harmful to human bodies and causes environmental pollution; polyethylene and crosslinked polyethylene insulating materials are flammable materials and have no flame retardance, and once a fire disaster happens around the overhead insulated cable or on a line due to faults, flames are easy to spread, and the life and property safety and the environment of residents along the line are threatened.

Publication (bulletin) No.: CN204740895U discloses a patent of "an environment-friendly waterproof flame-retardant overhead insulated cable", which proposes that a flame-retardant sheath is arranged outside an insulating layer, the insulating layer is made of cross-linked polyethylene, and the flame-retardant sheath is made of low-smoke halogen-free flame-retardant polyolefin. Publication (bulletin) No.: CN206907508U discloses the patent of "a light-duty overhead insulated cable of fire-retardant environmental protection of high strength", it includes main insulation layer and fire-retardant layer to have proposed the insulating layer, and fire-retardant layer sets up at the main insulation layer surface, and the main insulation layer is by crosslinked polyethylene insulating material and the inseparable crowded package of black resistant time look mother homogeneous mixing on the conductor, and fire-retardant layer adopts black resistant time type halogen-free low smoke fire-retardant polyolefin insulating material to be crowded package outside the main insulation layer by extrusion molding auxiliary engine. The cable in above-mentioned two patents all reaches fire-retardant purpose through set up fire-retardant layer outside aerial insulated cable insulating layer, and its insulating layer is flammable crosslinked polyethylene material, does not own possess the fire resistance, and consequently the fire behaviour of this cable is also less strong, and because of increased fire-retardant layer outside the insulating layer, greatly increased the total external diameter of cable for cable material cost increases, has reduced cable economy.

SUMMERY OF THE UTILITY MODEL

The applicant provides an environment-friendly flame-retardant overhead insulated cable with a reasonable structure aiming at the defects in the prior art, so that the cost of the cable and the outer diameter of the cable are greatly reduced, the cable is environment-friendly and economical, and the requirement of FT4 on flame retardant property in the UL2556 standard is met.

The utility model discloses the technical scheme who adopts as follows:

An environment-friendly flame-retardant overhead insulated cable is of a single-wire structure or a multi-wire stranded structure, wherein each single wire comprises a conductor which is a compressed round stranded conductor, and a flame-retardant insulating layer is coated outside the conductor to form a cable core; when the cable is a multi-conductor twisted structure, the outer surface of the insulating layer of each conductor is provided with a ridge line.

As a further improvement of the above technical solution:

The cable is composed of one cable core, two cable cores, three cable cores, four cable cores or three large cable cores and one small cable core.

The raised ridge lines are respectively arranged outside the insulating layers, and the number of the raised ridge lines is sequentially arranged from 1 to n.

And the insulating layer is sprayed and printed with a number code corresponding to the number of the ridge lines.

when the cable is in a multi-conductor stranding structure, the stranding pitch of the cable is smaller than 40 times of the outer diameter of a single conductor.

The insulating layer is made of low-smoke low-halogen flame-retardant cross-linked polyolefin.

The insulating layer comprises the following raw materials in parts by weight: 50-60 parts of silane grafted low-density polyethylene, 3-5 parts of antimony trioxide, 10-15 parts of decabromodiphenylethane, 2-4 parts of talcum powder, 4-6 parts of nano organic montmorillonite and 8-12 parts of maleic anhydride.

The conductor is a compacted round stranded conductor made of aluminum or aluminum alloy materials through a compaction process.

The utility model has the advantages as follows:

The utility model has compact and reasonable structure, the cable is composed of the conductor coated flame-retardant insulating layer, the cost is lower, and the economic performance is good; by adopting the insulating layer of the low-smoke low-halogen flame-retardant cross-linked polyolefin, the flame can not spread along the cable when a fire disaster happens due to good flame-retardant property of the insulating layer, the smoke quantity of gas released during combustion is small, the halogen-containing gas is low, carcinogenic toxic substances such as polybrominated dibenzofuran and the like can not be generated, the flame-retardant property and the environmental-friendly property of the cable are greatly enhanced, the diameter and the size of the cable are reduced while the flame-retardant property of the cable is realized, and the economical efficiency of the cable is enhanced;

The utility model discloses still include following advantage:

Different convex ridge lines and digital codes are arranged on the outer surface of the insulating layer to distinguish different cable cores in the multi-core cable, and the identification is strong to prevent the multi-core cable from being connected wrongly.

the multi-core flame-retardant overhead insulated cable can be manufactured as required, one-time installation and laying of the cable are facilitated, economy is good, and installation is convenient and fast.

Drawings

Fig. 1 is the structure diagram (3+1 core) of the present invention.

Fig. 2 is a schematic structural diagram (1 core) of the present invention.

Wherein: 1. a conductor; 2. an insulating layer; 3. a ridge line.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1 and fig. 2, in the environment-friendly flame retardant overhead insulated cable of this embodiment, the cable is of a single conductor structure or a multiple conductor twisted structure, the single conductor includes a conductor 1, the conductor 1 is a compressed round twisted conductor, and a flame retardant insulating layer 2 is coated outside the conductor 1 to form a cable core; when the cable is many wire transposition structure, the insulating layer 2 surface of every wire all is equipped with protruding ridge line 3.

The cable comprises a 1-core cable formed by one cable core, a 2-core cable formed by two cable cores, a 3-core cable formed by three cable cores, a 4-core cable formed by four cable cores, or a 3+ 1-core cable formed by three large cable cores and a small cable core; the cable is divided into a plurality of cores according to the number of the mutually insulated wires, wherein 1 core is that the cable contains one wire, 2 cores is that the cable contains two mutually insulated wires, and the like; the 3+1 core shows that the cable contains four mutually insulated wires, wherein three wires have the same diameter and one wire has a different diameter.

The ridge lines 3 are respectively arranged outside the insulating layers 2, and the number of the ridge lines is sequentially arranged from 1 to n.

Digital codes corresponding to the number of the convex ridges 3 are sprayed on the insulating layer 2, the convex ridges 3 and the digital codes are used for distinguishing different cable cores in the multi-core cable, and the identification is strong so as to prevent the multi-core cable from being connected incorrectly.

When the cable is in a multi-conductor stranding structure, the stranding pitch of the cable is smaller than 40 times of the outer diameter of a single conductor; when the cable is twisted, each wire has two motions of straight line and rotation; when the wire rotates one circle, the straight distance of the wire along the axial direction is the cable pitch.

Insulating layer 2 adopts low smoke and low halogen fire-retardant crosslinked polyolefin to make, and low smoke and low halogen fire-retardant crosslinked polyolefin itself has good fire behaviour, and the gas smoke volume of release when it burns is little, and halogen gas is lower wherein, can not produce carcinogenic toxic substance such as polybrominated dibenzofuran, has strengthened the fire behaviour and the feature of environmental protection of cable greatly.

The insulating layer 2 comprises the following raw materials in parts by weight: 50-60 parts of silane grafted low-density polyethylene, 3-5 parts of antimony trioxide, 10-15 parts of decabromodiphenylethane (DBDPE), 2-4 parts of Talcum Powder (TP), 4-6 parts of nano organic montmorillonite (OMMT) and 8-12 parts of Maleic Anhydride (MAPE).

The conductor 1 is a compacted round stranded conductor made of aluminum or aluminum alloy materials through a compaction process.

The multi-core flame-retardant overhead insulated cable can be manufactured as required, one-time installation and laying of the cable are facilitated, economy is good, and installation is convenient and fast.

As shown in fig. 1, in the first embodiment, the cable has a 3+1 core structure, and includes four mutually insulated conductors, three of which have equal diameters and one of which has unequal diameters; the single lead consists of a conductor 1 and an insulating layer 2 coated outside the conductor 1, wherein the conductor 1 is a compressed round stranded conductor which is made of aluminum or aluminum alloy materials meeting the requirements of GB/T3954-2008 or GB/T30552-2014 through a compression process; the insulating layer 2 is made of low-smoke low-halogen flame-retardant cross-linked polyolefin and extruded on the outer surface of the conductor 1; the outer surfaces of the insulating layers 2 of the four wires are sequentially provided with one, two, three and four ridge lines 3 anticlockwise as shown in figure 1, correspondingly, the outer surfaces of the insulating layers 2 of the wires are sequentially sprayed and printed with a digital code 1, a digital code 2 and a digital code 3, and the surface of the insulating layer 2 of the last wire, namely the wire provided with the four ridge lines 3, is sprayed and printed with a digital code 0 or other numbers.

As shown in fig. 2, the second embodiment is a cable with a 1-core structure, which is composed of only one conductive wire, and the outer surface of the conductive wire insulation layer 2 is free from the raised ridge 3 or the number code.

Meanwhile, the insulating layer 2 is made of low-smoke low-halogen flame-retardant cross-linked polyolefin, and specifically, the insulating layer 2 comprises the following components in parts by weight: 55 parts of silane grafted low-density polyethylene, 4 parts of antimony trioxide, 12 parts of decabromodiphenylethane, 3 parts of talcum powder, 5 parts of nano organic montmorillonite and 10 parts of maleic anhydride.

The utility model discloses simple structure, economic environmental protection to fire behaviour is good, and the practicality is strong.

The above description is for the purpose of explanation and not limitation of the invention, which is defined in the claims, and any modifications may be made within the scope of the invention.

Claims (8)

1. The utility model provides a fire-retardant overhead insulated cable of environment-friendly which characterized in that: the cable is of a single-wire structure or a multi-wire stranded structure, the single wire comprises a conductor (1), the conductor (1) is a compressed round stranded conductor, and a flame-retardant insulating layer (2) is coated outside the conductor (1) to form a cable core; when the cable is a multi-conductor twisted structure, the outer surface of the insulating layer (2) of each conductor is provided with a ridge line (3).

2. The environment-friendly flame-retardant overhead insulated cable according to claim 1, characterized in that: the cable is composed of one cable core, two cable cores, three cable cores, four cable cores or three large cable cores and one small cable core.

3. The environment-friendly flame-retardant overhead insulated cable according to claim 1, characterized in that: the ridge lines (3) are respectively arranged outside the insulating layer (2), and the number of the ridge lines is sequentially arranged from 1 to n.

4. The environment-friendly flame-retardant overhead insulated cable according to claim 3, characterized in that: and digital codes corresponding to the number of the ridge lines (3) are sprayed and printed on the insulating layer (2).

5. The environment-friendly flame-retardant overhead insulated cable according to claim 1, characterized in that: when the cable is in a multi-conductor stranding structure, the stranding pitch of the cable is smaller than 40 times of the outer diameter of a single conductor.

6. The environment-friendly flame-retardant overhead insulated cable according to claim 1, characterized in that: the insulating layer (2) is made of low-smoke low-halogen flame-retardant cross-linked polyolefin.

7. The environment-friendly flame-retardant overhead insulated cable according to claim 6, characterized in that: the insulating layer (2) comprises the following raw materials in parts by weight: 50-60 parts of silane grafted low-density polyethylene, 3-5 parts of antimony trioxide, 10-15 parts of decabromodiphenylethane, 2-4 parts of talcum powder, 4-6 parts of nano organic montmorillonite and 8-12 parts of maleic anhydride.

8. The environment-friendly flame-retardant overhead insulated cable according to claim 1, characterized in that: the conductor (1) is a compacted round stranded conductor made of aluminum or aluminum alloy materials through a compaction process.