CN212624934U - Low-smoke halogen-free flame-retardant power cable with armor - Google Patents

Abstract

The application relates to the field of cables, in particular to a low-smoke halogen-free flame-retardant power cable with an armor, which comprises an inner layer and an outer layer; the inner layer is sequentially provided with a conductor, an insulating layer, a filling layer and a flame-retardant layer from inside to outside; the outer layer is sequentially provided with a binding layer and a protective layer from inside to outside; the protective layer is an ethylene-tetrafluoroethylene copolymer resin layer, a plurality of grid holes are formed in the periphery of the protective layer, the grid holes are filled with a falling layer, and the falling layer is a halogen-free low-smoke irradiation crosslinking flame-retardant polyolefin layer. The cable has the advantages that smoke generated by the cable in a fire disaster is reduced, and the escape rate is improved.

Description

Low-smoke halogen-free flame-retardant power cable with armor

Technical Field

The application relates to the field of cables, in particular to a low-smoke halogen-free flame-retardant power cable with an armor.

Background

At present, with the rapid development of national economy, cables are widely applied to various power stations, such as nuclear power stations, thermal power stations, etc., and various fields, such as subway stations, power plants, high-rise buildings, military facilities, oil platforms, etc., so that the requirements of people on the quality and functions of the cables are higher and higher.

The cable comprises a cable core, a wrapping layer and an outer sheath, wherein the cable core sequentially comprises a cable conductor, an inner shielding layer, an insulating layer, an outer shielding layer and a copper strip shielding layer from inside to outside, the wrapping layer, the inner sheath, a steel strip armor layer and the outer sheath are sequentially arranged outside the cable core from inside to outside, and a filling rope made of non-open mesh polypropylene tearing materials is further arranged between the wrapping layer and the cable core. The cable core is composed of an inner core portion and an outer core portion. The inner core is composed of seven strands of aluminum alloy wires. The outer core part is positioned on the outer layer of the inner core part and consists of twelve strands of pure aluminum conducting wires, the outer sheath is made of polyvinyl chloride, and the inner core part and the outer core part and the water-blocking fibers form a core bundle body together in a twisting and pressing mode.

Aiming at the related technologies, when a fire disaster occurs, the cable is subjected to high temperature for a long time, the outer sheath is easy to be ignited, and after the outer sheath is ignited, the outer sheath of the polyvinyl chloride is easy to generate black smoke, so that the sight of escapers is influenced, and the safety problem exists.

SUMMERY OF THE UTILITY MODEL

In order to reduce the smog of cable self production when the conflagration, improve the rate of fleing, this application provides a take armor low smoke and zero halogen flame retardant power cable.

The application provides a take armoured low smoke and zero halogen flame retardant power cable adopts following technical scheme:

the armored low-smoke halogen-free flame-retardant power cable comprises an inner layer and an outer layer;

the inner layer is sequentially provided with a conductor, an insulating layer, a filling layer and a flame-retardant layer from inside to outside;

the outer layer is sequentially provided with a binding layer and a protective layer from inside to outside;

the protective layer is an ethylene-tetrafluoroethylene copolymer resin layer, a plurality of grid holes are formed in the periphery of the protective layer, shedding layers are filled in the grid holes, and each shedding layer is a halogen-free low-smoke irradiation cross-linked flame-retardant polyolefin layer.

By adopting the technical scheme, when the cable normally works, the outer layer protects the inner layer and maintains the normal operation of the cable, when a fire disaster occurs, the protective layer and the shedding layer continue to maintain the normal operation of the cable due to the self heat-resistant flame-retardant performance, after the shedding layer is ignited, the ignited shedding layer gradually falls off from the grid holes along with the combustion of the shedding layer, so that the ignition point can be conveniently and timely kept away from the cable, the temperature around the cable is reduced, the service life of the cable in the fire disaster is prolonged, when the shedding layer or the protective layer is ignited, the protective layer is an ethylene-tetrafluoroethylene copolymer resin layer, and the shedding layer is a halogen-free low-smoke irradiation crosslinking flame-retardant polyolefin layer, so that a large amount of smoke is not easily generated when the protective layer and the shedding layer are ignited, the sight of an escaper is not easily shielded, and.

Preferably, the hole wall of the grid hole is provided with a plurality of embedded grooves, and the falling layer is filled into the embedded grooves.

Through adopting above-mentioned technical scheme, when the cable normally used, because the part of the layer that drops is filled to inlay and is established and inlay and establish the inslot, the wholeness of the layer that drops and inoxidizing coating has been improved, be convenient for protect the inlayer of cable, when meetting the conflagration, after the layer that drops breaks away from the cable, owing to inlay the existence of establishing the groove this moment, the inoxidizing coating is easy to be split and the segmentation drops, when this is lighted as the inoxidizing coating, the inoxidizing coating of having set up is convenient for in time break away from the cable, make the cable keep away from the fire source, the normal.

Preferably, the outer side of the strapping layer is roughened.

Through adopting above-mentioned technical scheme, when the inoxidizing coating and the layer that drops and the binding course bonding are fixed, because the coarse setting in the outside of binding course, the inoxidizing coating and the area of contact of the layer that drops and binding course are increased, have improved the inoxidizing coating, the integration nature of the layer that drops and binding course, and consequently the layer that drops is difficult for droing at will.

Preferably, the binding layer is formed by winding and binding a glass fiber rope on the outer side of the flame retardant layer.

Through adopting above-mentioned technical scheme, the strapping layer is tied up the inlayer for intensity is stronger behind the festival of inlayer, and the inlayer of cable is difficult for receiving the damage under the protection of strapping layer.

Preferably, the glass fiber strands of the strapping layer are doped with a plurality of copper wires.

Through adopting above-mentioned technical scheme, the copper line of doping makes the strapping layer inside have the metal in the glass fiber rope, therefore the strapping layer has the effect of shielding, and the cable is difficult for receiving external signal's influence when normal work.

Preferably, the number of the conductors is three, the conductors are mutually wound, and the insulation layers are arranged on the outer sides of the three conductors.

Through adopting above-mentioned technical scheme, three conductor plays electrically conductive effect simultaneously, has improved the electrically conductive quality of cable.

Preferably, the filling layer is formed by a plurality of rubber ball filling layers.

Through adopting above-mentioned technical scheme, the rubber ball is as the filling layer, when playing insulating effect, because the self elasticity of rubber ball, the rubber ball easily becomes regular circular with the sectional shape packing of cable, makes the outward appearance of cable more regular pleasing to the eye.

Preferably, the flame retardant layer is a mica tape layer.

Through adopting above-mentioned technical scheme, the mica tape can bear high temperature, and is difficult for producing a large amount of smog, when the normal live time of extension cable in the conflagration, is difficult for producing smog and shelters from the sight.

In summary, the present application includes at least one of the following beneficial technical effects:

1. during fire, the protective layer and the release layer protect the cable and maintain normal operation of the cable, after the release layer is ignited, the release layer gradually falls off from the grid holes, so that the cable is far away from an ignition point, the temperature around the cable is reduced, and the cable is not easy to continue burning due to the disengagement of the ignition point, so that the normal use time of the cable in the fire is prolonged, the protective layer of the ethylene-tetrafluoroethylene copolymer resin layer and the release layer of the halogen-free low-smoke irradiation crosslinking flame-retardant polyolefin layer are not easy to generate a large amount of smoke to influence the sight when the cable is ignited, the escape is facilitated, and the escape success rate is improved;

2. after the falling layer falls off, after the protective layer is ignited, the embedded groove enables the protective layer to be conveniently disconnected, the part on which the protective layer catches fire can fall off in time, the fire source can leave the cable in time, the possibility that the cable continues to burn is reduced, and the normal use time of the cable in a fire disaster is prolonged.

Drawings

FIG. 1 is a cross-sectional structural schematic of an embodiment of the present application;

FIG. 2 is a schematic view of a connection structure of a protective layer and a release layer according to an embodiment of the present application;

fig. 3 is an enlarged view at a in fig. 2.

Reference numerals: 1. a conductor; 2. an insulating layer; 3. a filling layer; 4. a flame retardant layer; 5. a binding layer; 6. a protective layer; 7. mesh holes; 8. a release layer; 9. the groove is embedded.

Detailed Description

The present application is described in further detail below with reference to the accompanying drawings.

Referring to fig. 1, the embodiment of the application discloses a armored low-smoke halogen-free flame-retardant power cable, which comprises an inner layer and an outer layer. The inner layer is sequentially provided with a conductor 1, an insulating layer 2, a filling layer 3 and a flame-retardant layer 4 from inside to outside.

Referring to fig. 1, three conductors 1 are provided, the three conductors 1 are wound around each other, and insulation layers 2 are provided outside the three conductors 1. The insulating layer 2 is a rubber layer, and the three conductors 1 are protected by the insulating layer 2 to work independently. The flame-retardant layer 4 outside the insulating layer 2 is a mica tape layer which has good flame-retardant performance and is not easy to generate a large amount of smoke in a high-temperature environment.

Referring to fig. 1, a plurality of rubber balls are provided in the filling layer 3, and the filling layer 3 is provided between the insulating layer 2 and the flame retardant layer 4. The plurality of rubber balls fill the space between the insulating layer 2 and the flame-retardant layer 4, so that the possibility of a gap between the flame-retardant layer 4 and the insulating layer 2 is reduced, the integrity of the inner layer is improved, and the basic cross-sectional shape of the cable is convenient to maintain.

Referring to fig. 1, the outer layer is provided with a binding layer 5 and a protective layer 6 in sequence from inside to outside.

Referring to fig. 1, the binding layer 5 is formed by winding and binding a glass fiber rope around the outside of the flame retardant layer 4, and the glass fiber rope is formed by weaving a plurality of glass fiber yarns. The glass fiber rope is doped with a plurality of copper wires (not shown in the figure), and the copper wires and the glass fiber wires are woven to form the glass fiber rope. When the glass fiber rope is bound on the outer side of the flame-retardant layer 4, the outer side of the glass limiting rope is arranged roughly, so that the protective layer 6 and the binding layer 5 are conveniently bonded and fixed. The copper wire makes strapping layer 5 have the shielding effect, has reduced the influence of external signal to cable work. The inner layer is protected by the binding layer 5 and is not easily damaged.

Referring to fig. 1 and 2, the protective layer 6 is an ethylene-tetrafluoroethylene copolymer resin layer, and a plurality of mesh holes 7 are formed on the circumferential side of the protective layer 6. The grid holes 7 are all filled with a shedding layer 8, and the shedding layer 8 is a halogen-free low-smoke irradiation crosslinking flame-retardant polyolefin layer. The protective layer 6 and the shedding layer 8 are both fireproof, and the protective layer 6 and the shedding layer 8 are convenient for maintaining normal operation of the cable in case of fire. Even if the protective layer 6 and the release layer 8 are on fire, due to the characteristics of materials, the protective layer 6 and the release layer 8 are not easy to generate a large amount of smoke to shield the sight, so that the escape is facilitated. And after the falling layer 8 catches fire, the falling layer 8 can be separated from the grid holes 7 in time to leave the cable, so that a fire source can conveniently leave the cable, the cable is not easy to continue burning, and the normal service time of the cable in a fire disaster is prolonged.

Referring to fig. 2 and 3, in order to improve the integrity of the release layer 8 and the protective layer 6, a plurality of embedding grooves 9 are provided on the hole walls of the mesh holes 7, and the release layer 8 is filled in the embedding grooves 9. Under normal environment, the stratum abscissae 8 is difficult for breaking away from the inoxidizing coating 6 under the effect of inlaying and establishing groove 9, is convenient for protect the inlayer of cable. In case of fire, when the shedding layer 8 is shed, the wall thickness of the protective layer 6 at the embedded groove 9 is thinner, and after the protective layer 6 catches fire, the part on fire of the protective layer 6 is easily disconnected from the embedded groove 9, so that the possibility of continuous combustion of the protective layer 6 is reduced, and the normal service time of the cable in the fire is prolonged.

The implementation principle of the embodiment is as follows:

when the cable normally works, the outer layer protects the inner layer and maintains the normal operation of the cable. When a fire disaster occurs, the protective layer 6 and the shedding layer 8 continue to maintain the normal operation of the cable due to the self heat-resistant and flame-retardant properties. After the peeling layer 8 is ignited, the ignited peeling layer 8 gradually falls off from the mesh holes 7 as the peeling layer 8 burns. The ignition point is convenient to be away from the cable in time, so that the temperature around the cable is reduced, and the service life of the cable in fire is prolonged. After the shedding layer 8 is shed and the protective layer 6 is ignited, the ignited part of the protective layer 6 is easily disconnected from the embedded groove 9, and the possibility of continuous combustion of the protective layer 6 is reduced. When the shedding layer 8 or the protective layer 6 catches fire, the protective layer 6 is an ethylene-tetrafluoroethylene copolymer resin layer, and the shedding layer 8 is a halogen-free low-smoke irradiation cross-linked flame-retardant polyolefin layer, so that a large amount of smoke is not easily generated when the protective layer 6 and the shedding layer 8 are burnt, the sight of an escaper is not easily shielded, and the escape success rate is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. Take armor low smoke and zero halogen flame retardant power cable, its characterized in that: comprises an inner layer and an outer layer;

the inner layer is sequentially provided with a conductor (1), an insulating layer (2), a filling layer (3) and a flame-retardant layer (4) from inside to outside;

the outer layer is sequentially provided with a binding layer (5) and a protective layer (6) from inside to outside;

the flame-retardant polyolefin coating is characterized in that the protective layer (6) is an ethylene-tetrafluoroethylene copolymer resin layer, a plurality of grid holes (7) are formed in the periphery of the protective layer (6), the grid holes (7) are filled with a release layer (8), and the release layer (8) is a halogen-free low-smoke irradiation crosslinking flame-retardant polyolefin layer.

2. The armored low-smoke halogen-free flame-retardant power cable according to claim 1, wherein: the hole wall of the grid hole (7) is provided with a plurality of embedding grooves (9), and the falling layer (8) is filled in the embedding grooves (9).

3. The armored low-smoke halogen-free flame-retardant power cable according to claim 2, wherein: the outer side of the strapping layer (5) is arranged roughly.

4. The armored low-smoke halogen-free flame-retardant power cable according to claim 3, wherein: the binding layer (5) is formed by winding and binding a glass fiber rope on the outer side of the flame-retardant layer (4).

5. The armored low-smoke halogen-free flame-retardant power cable according to claim 4, wherein: the glass fiber ropes of the strapping layer (5) are doped with a plurality of copper wires.

6. The armored low-smoke halogen-free flame-retardant power cable according to claim 1, wherein: the three conductors (1) are wound with each other, and the insulation layers (2) are arranged on the outer sides of the three conductors (1).

7. The armored low-smoke halogen-free flame-retardant power cable according to claim 6, wherein: the filling layer (3) is formed by a plurality of rubber ball filling layers (3).

8. The armored low-smoke halogen-free flame-retardant power cable according to claim 1, wherein: the flame-retardant layer (4) is a mica tape layer.

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