CN214043193U

CN214043193U - Environment-friendly low-smoke halogen-free flame-retardant armored power cable

Info

Publication number: CN214043193U
Application number: CN202120221864.1U
Authority: CN
Inventors: 王焱; 张海平; 陈彦; 王振金
Original assignee: Hunan Valin Wire and Cable Co Ltd
Current assignee: Hunan Valin Wire and Cable Co Ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2021-08-24
Anticipated expiration: 2031-01-27

Abstract

The utility model discloses a fire-retardant armor power cable of environmental protection low smoke and zero halogen, sinle silk subassembly center on the syntropy transposition of central packing rope, and the sinle silk subassembly includes sinle silk body, internal shield layer, insulating layer, the outer shielding layer of insulating layer surface fixed connection, and it has the fire prevention filler to fill between outer shielding layer and the insulating layer, and the inner sheath layer is connected to outer shielding layer surface fixed connection, and inner sheath layer surface connects gradually armor, flame retardant coating, outer sheath layer and prevents the ultraviolet layer. The inner shielding layer is an aluminum tape bonding shielding polyethylene outer sleeve, so that the anti-interference performance and the shock resistance of the cable can be effectively enhanced. The insulating layer is wrapped on the outer side of the shielding layer by adopting modified ethylene propylene diene monomer rubber, and has good flame retardance, high temperature resistance, cold resistance and aging resistance. And fireproof filler is filled between the insulating layer and the outer shielding layer, so that the wire core can be effectively protected in a heat insulation manner. The outer shielding layer is formed by mixing and weaving metal wires and aramid fibers and has the performance of shielding interference and enhancing transverse and longitudinal stretching.

Description

Environment-friendly low-smoke halogen-free flame-retardant armored power cable

Technical Field

The utility model relates to a cable field especially relates to a fire-retardant armor power cable of environmental protection low smoke and zero halogen.

Background

At present, with the promotion of comprehensive national power in China, various fields are developed vigorously, the demand of power cables is increasing day by day, the power cables are used for transmitting and distributing electric energy, and the power cables are often used for urban underground power grids, power station leading-out lines, power supply in industrial and mining enterprises, underwater power transmission lines crossing river, sea and the like.

For a long time, the coating materials of the traditional cables are mainly halogen-containing polymers such as polyvinyl chloride (PVC), Chloroprene Rubber (CR), chlorosulfonated polyethylene (CSM) and the like, and these materials have flame retardant property and can inhibit the spread of flame, but when the materials are combusted, a large amount of harmful gases such as hydrogen chloride and carbon monoxide and thick smoke are generated, and more than 80% of the causes of death of people in fire accidents are related to the harmful gases and thick smoke generated by the combustion of the materials at the fire scene. The existing power cable has general high-temperature resistance and fire resistance, and once the cable is exposed to sunlight for a long time, the consequences of a sudden fire are not considered. Patent CN201811004472.9 discloses a fireproof and wear-resistant copper-core armored power cable, which achieves the purpose of fire prevention and fire retardation by setting an asbestos flame-retardant layer, a fire-resistant fiber layer and a flame-retardant filling layer. However, since the invention patent does not have a measure for ultraviolet protection, if the work is exposed to sunlight for a long time, a fire may be caused by local high temperature. The outer sheath layer of the invention has no flame retardant effect, and the flame retardant is carried out from the asbestos layer of the inner layer at the cost of sacrificing the outer sheath layer. This necessarily results in a great deal of heat and smoke being emitted by the burning of the outer layer of the cable, which makes rescue work extremely difficult.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fire-retardant armor power cable of environmental protection low smoke and zero halogen to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a fire-retardant armor power cable of environmental protection low smoke and zero halogen, includes sinle silk subassembly and center packing rope, the sinle silk subassembly is around center packing rope syntropy transposition, the sinle silk subassembly includes sinle silk body, sinle silk body surface cladding shielding layer, the outer surface cladding of internal shield layer has the insulating layer, the outer surface fixed connection external shield of insulating layer, it has the fire prevention filler to fill between external shield layer and the insulating layer, the outer surface fixed connection inner sheath layer of external shield layer, inner sheath layer surface connects gradually armor, flame retardant coating, outer jacket layer and prevents the ultraviolet layer. The cable core is a co-directional twisted unit folded yarn, the cable core is one of a copper conductor and a silver-plated or tin-plated copper conductor, the outer surface of the cable core is fixedly connected with an inner shielding layer, the outer surface of the inner shielding layer is fixedly connected with an insulating layer, the insulating layer is wrapped in the outer side of the shielding layer in an extrusion mode by adopting modified halogen-free low-smoke flame-retardant ethylene propylene diene monomer, and the modified ethylene propylene diene monomer is prepared by taking ethylene propylene diene monomer as a matrix and adding flame retardant agent magnesium aluminum hydrotalcite, aluminum hydroxide and magnesium hydroxide. The LSOH-EPDM rubber material with good flame retardant property, high temperature resistance, cold resistance and aging resistance is obtained by controlling the dosage of the flame retardant. The fireproof filler is filled between the insulating layer and the outer shielding layer, the outer side of the outer shielding layer is fixedly connected with the inner sheath layer, the outer side of the inner sheath layer is fixedly connected with the armor layer, the outer side of the armor layer is fixedly connected with the fireproof fiber layer, the outer side of the fireproof layer is fixedly connected with the outer sheath layer, and the surface of the outer sheath layer is uniformly coated with the protective layer. The inner shielding layer is a plastic-coated aluminum tape bonding shielding polyethylene outer sleeve.

As a further improvement of the above technical solution:

the thickness of the insulating layer is 1-2 mm.

The fireproof filler is one or the combination of two of fireproof rock wool and glass fiber, and both have good fireproof and flame-retardant properties.

The outer shielding layer is formed by mixing and weaving tinned steel wires and aramid fibers, and the weaving density is not lower than 50%. The tinned steel wire is used for shielding interference and ensuring the transmission efficiency of the cable. Aramid filaments are used to enhance the transverse and longitudinal tensile properties.

The fireproof layer is made of flame-retardant asbestos and is 1mm-3mm thick.

The outer sheath layer is made by blending halogen-free low-smoke flame-retardant polyethylene/ethylene-vinyl acetate/ethylene propylene diene monomer rubber and then adding a flame retardant to extrude, and the extrusion thickness is 1mm-2 mm. The low-density polyethylene has good electrical insulation and physical properties, has small smoke generation amount, but has nonpolar molecules and is difficult to be compatible with inorganic fillers. The tensile strength of the ethylene-vinyl acetate copolymer is less than that of polyethylene, but the elongation at break is greater than that of the polyethylene, and the molecule has polarity and good compatibility with inorganic filler. The blending of polyethylene and ethylene-vinyl acetate copolymer can exert respective advantages. The ethylene propylene diene monomer has excellent ageing resistance, corrosion resistance and high temperature resistance, and the ethylene propylene diene monomer is added on the basis of blending of polyethylene and ethylene-vinyl acetate copolymer to improve the material performance, wherein the blending ratio is 38: 52: 10. the flame retardant magnesium hydroxide and the inorganic filler halloysite nanotube are added on the basis of blending, the halloysite mainly comprises silicon dioxide and aluminum oxide, the fillers can enhance the tensile strength and the bending strength of the composite material, and the used base materials are environment-friendly and halogen-free. Meanwhile, due to the hollow structural characteristic of the halloysite nanotube, the outer sheath layer can form a structure similar to the loose and porous honeycomb briquette after high temperature, so that the heat insulation and flame retardance are further effectively realized.

The coating thickness of the ultraviolet-proof layer is 0.5mm-1 mm. The ultraviolet-proof layer adopts a treatment process of doping the waterborne polyurethane coating adhesive with the superfine TiO2 powder material, so that the ultraviolet-proof and ageing resistance of the cable can be effectively improved.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a fire-retardant armor power cable of environmental protection low smoke and zero halogen passes through oversheath layer, flame retardant coating, fire prevention filler and the inside insulating layer that has the fire-retardant characteristic of fire prevention, provides four layers of protection for central cable core to solve the not enough of current system. The outer sheath layer is prepared by mixing and melting polyethylene/ethylene-vinyl acetate copolymer/ethylene propylene diene monomer, adding a halloysite nanotube and other flame retardants, uniformly mixing, has good electrical insulation and physical properties, small smoke generation amount, excellent aging resistance, corrosion resistance and high temperature resistance, adding the flame retardant magnesium hydroxide/inorganic filler halloysite nanotube on a blending basis, enhancing the tensile strength and bending strength of the composite material, improving the flame retardant property, and using the base material which is environment-friendly and halogen-free. Due to the hollow structural characteristic of the halloysite nanotube, the outer sheath layer can form a structure similar to the loose and porous structure of honeycomb briquette on the surface after high temperature, thereby achieving effective heat insulation. The fireproof layer is made of flame-retardant asbestos, the thickness of the fireproof layer is 1mm-3mm, and the inner core is further effectively protected in a heat insulation mode. The fireproof insulating layer is made of modified ethylene propylene diene monomer rubber, the ethylene propylene diene monomer rubber is used as a matrix, and flame retardants, namely magnesium aluminum hydrotalcite, aluminum hydroxide and magnesium hydroxide are added. The flame retardant has good flame retardant property, high temperature resistance, cold resistance and aging resistance by controlling the dosage of the flame retardant. The inner shielding layer is an aluminum tape bonding shielding polyethylene outer sleeve, so that the anti-interference performance and the shock resistance of the cable can be effectively enhanced. The outer shielding layer is formed by mixing and weaving metal wires and aramid fibers, so that the shielding layer has the performance of shielding interference and enhancing transverse and longitudinal stretching. A protective layer is attached to the outer surface of the outer sheath layer, and the ultraviolet resistance and the ageing resistance of the cable can be effectively improved by adopting a treatment process of doping the aqueous polyurethane coating glue with the superfine TiO2 powder material.

Drawings

Fig. 1 is a schematic view of the internal structure of the cable of the present invention.

Reference numerals: 11. a wire core body; 12. an inner shield layer; 13. an insulating layer; 2. a center-fill cord; 3. a fire-resistant filler; 4. an outer shield layer; 5. an inner jacket layer; 6. an armor layer; 7. a fire barrier layer; 8. an outer jacket layer; 9. and an ultraviolet-proof layer.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" 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 is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected 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.

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.

Example 1

As shown in fig. 1, the environment-friendly low-smoke halogen-free flame-retardant armored power cable of the embodiment includes, from inside to outside, wire core assemblies 1, fireproof fillers 3, an outer shielding layer 4, an inner sheath layer 5, an armor layer 6, a fireproof layer 7, an outer sheath layer 8 and an ultraviolet-proof layer 9, wherein 5 wire core assemblies 1 are twisted around a central filling rope 2 to form a cable, each wire core assembly 1 includes a wire core body 11, an inner shielding layer 12 is coated on the outer surface of the wire core body 11, and an insulating layer 13 is coated on the outer surface of the inner shielding layer 12; the fireproof filler 3 is filled outside the finished cable, the inner shielding layer 12 is a plastic-coated aluminum tape bonding shielding polyethylene outer sleeve, and the insulating layer 13 is formed by extruding and wrapping a modified ethylene propylene diene monomer rubber material. The thickness of the insulating layer 13 is 1 mm. The fireproof filler 3 is fireproof rock wool. The outer shielding layer 4 is formed by mixing and weaving tinned steel wires and aramid fibers, and the weaving density is 50%. The fireproof layer 7 is made of flame-retardant asbestos and is 1mm thick. The outer sheath layer 8 is made by blending halogen-free low-smoke flame-retardant polyethylene/ethylene-vinyl acetate/ethylene propylene diene monomer rubber and then adding a flame retardant to extrude, and the extruded thickness is 1 mm. The ultraviolet-proof layer 9 was coated to a thickness of 0.5 mm.

Example 2

The environment-friendly low-smoke halogen-free flame-retardant armored power cable comprises wire core assemblies 1, fireproof fillers 3, an outer shielding layer 4, an inner sheath layer 5, an armor layer 6, a fireproof layer 7, an outer sheath layer 8 and an ultraviolet-proof layer 9, wherein the wire core assemblies 1 are arranged from inside to outside, the 5 wire core assemblies 1 are twisted around a central filling rope 2 to form a cable, each wire core assembly 1 comprises a wire core body 11, the outer surface of each wire core body 11 is coated with an inner shielding layer 12, and the outer surface of each inner shielding layer 12 is coated with an insulating layer 13; the fireproof filler 3 is filled outside the finished cable, the inner shielding layer 12 is a plastic-coated aluminum tape bonding shielding polyethylene outer sleeve, and the insulating layer 13 is formed by extruding and wrapping a modified ethylene propylene diene monomer rubber material. The thickness of the insulating layer 13 is 1.5 mm. The fireproof filler 3 is glass fiber. The outer shielding layer 4 is formed by mixing and weaving tinned steel wires and aramid fibers, and the weaving density is 70%. The fire-proof layer 7 is made of flame-retardant asbestos and has the thickness of 2 mm. The outer sheath layer 8 is made by blending halogen-free low-smoke flame-retardant polyethylene/ethylene-vinyl acetate/ethylene propylene diene monomer rubber and then adding a flame retardant to extrude, and the extruded thickness is 1.5 mm. The ultraviolet-proof layer 9 was coated to a thickness of 0.75 mm.

Example 3

The environment-friendly low-smoke halogen-free flame-retardant armored power cable comprises wire core assemblies 1, fireproof fillers 3, an outer shielding layer 4, an inner sheath layer 5, an armor layer 6, a fireproof layer 7, an outer sheath layer 8 and an ultraviolet-proof layer 9 which are arranged from inside to outside, wherein the wire core assemblies 1 are twisted around a central filling rope 2 to form a cable, each wire core assembly 1 comprises a wire core body 11, the outer surface of each wire core body 11 is coated with an inner shielding layer 12, and the outer surface of each inner shielding layer 12 is coated with an insulating layer 13; the fireproof filler 3 is filled outside the finished cable, the inner shielding layer 12 is a plastic-coated aluminum tape bonding shielding polyethylene outer sleeve, and the insulating layer 13 is formed by extruding and wrapping a modified ethylene propylene diene monomer rubber material. The thickness of the insulating layer 13 is 2 mm. The fireproof filler 3 is the combination of two of fireproof rock wool and glass fiber. The outer shielding layer 4 is formed by mixing and weaving tinned steel wires and aramid fibers, and the weaving density is not lower than 50%. The fire-proof layer 7 is made of flame-retardant asbestos and is 3mm thick. The outer sheath layer 8 is made by blending halogen-free low-smoke flame-retardant polyethylene/ethylene-vinyl acetate/ethylene propylene diene monomer rubber and then adding a flame retardant to extrude, and the extrusion thickness is 2 mm. The uv-protective layer 9 is applied to a thickness of 1 mm.

The cables produced in the above examples, example 1, were the lightest in weight and had inferior performance compared to examples 2 and 3, but were inexpensive to manufacture. Simultaneously the utility model discloses still have the characteristics that the fireproof effect is good.

The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a fire-retardant armoured power cable of environmental protection low smoke and zero halogen, includes sinle silk subassembly (1), fire prevention filler (3), outer shielding layer (4), inner sheath layer (5), armor (6), flame retardant coating (7), oversheath layer (8) and anti ultraviolet layer (9) that from interior to exterior set up, its characterized in that: the cable comprises a plurality of wire core assemblies (1) which are stranded into a cable around a central filling rope (2), wherein each wire core assembly (1) comprises a wire core body (11), the outer surface of each wire core body (11) is coated with an inner shielding layer (12), and the outer surface of each inner shielding layer (12) is coated with an insulating layer (13); the fireproof filler (3) is filled on the outer side of the cable, the inner shielding layer (12) is a plastic-coated aluminum tape bonding shielding polyethylene outer sleeve, and the insulating layer (13) is formed by extruding and wrapping a modified ethylene propylene diene monomer rubber material.

2. The environment-friendly low-smoke halogen-free flame-retardant armored power cable according to claim 1, characterized in that: the thickness of the insulating layer (13) is 1-2 mm.

3. The environment-friendly low-smoke halogen-free flame-retardant armored power cable according to claim 2, characterized in that: the fireproof filler (3) is one or the combination of two of fireproof rock wool or glass fiber.

4. The environment-friendly low-smoke halogen-free flame-retardant armored power cable according to claim 3, characterized in that: the outer shielding layer (4) is formed by mixing and weaving tinned steel wires and aramid fibers, and the weaving density is not lower than 50%.

5. The environment-friendly low-smoke halogen-free flame-retardant armored power cable according to claim 4, characterized in that: the fireproof layer (7) is made of flame-retardant asbestos and is 1-3 mm thick.

6. The environment-friendly low-smoke halogen-free flame-retardant armored power cable according to claim 5, characterized in that: the outer sheath layer (8) is prepared by blending halogen-free low-smoke flame-retardant polyethylene/ethylene-vinyl acetate/ethylene propylene diene monomer and then adding a flame retardant to extrude, and the extrusion thickness is 1mm-2 mm.

7. The environment-friendly low-smoke halogen-free flame-retardant armored power cable according to claim 6, characterized in that: the coating thickness of the ultraviolet-proof layer (9) is 0.5mm-1 mm.