CN216528145U

CN216528145U - Fireproof pressure-resistant electric wire and cable

Info

Publication number: CN216528145U
Application number: CN202123210396.7U
Authority: CN
Inventors: 周杏芬; 张斌; 周君; 刘喜
Original assignee: Wuxi Linde Cable Co ltd
Current assignee: Wuxi Linde Cable Co ltd
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2022-05-13
Anticipated expiration: 2031-12-20

Abstract

The utility model relates to the technical field of wires and cables, in particular to a fireproof pressure-resistant wire and cable which comprises a conductor core group, wherein the outer wall of the conductor core group is coated with an insulating layer to form a conductor with a circular section, and four conductors are arranged in a pairwise tangential manner and wound by a polyester tape together with filling ropes distributed on the outer side of the conductor core group to form a conductor unit with a circular section; the outer wall of the conductor unit is coated with a protective layer for providing radial compression resistance and axial tensile protection for the conductor unit; the inoxidizing coating includes the steel wire string and the elastic support layer of cladding in the steel wire string outside, can play certain cushioning effect when the cable receives external force to strike, provides radial resistance to compression protection, has improved the compressive capacity of cable.

Description

Fireproof pressure-resistant electric wire and cable

Technical Field

The utility model relates to the technical field of electric wires and cables, in particular to a polyvinyl chloride fireproof pressure-resistant electric wire and cable.

Background

A cable is a conductor made of one or more mutually insulated conductors and an outer insulating protective layer that carries power or information from one location to another. Typically a rope-like cable made up of several or groups of conductors (at least two in each group) twisted together, with the conductors of each group being insulated from one another and often twisted around a center, the entire outer surface being coated with a highly insulating coating. The cable has the characteristics of internal electrification and external insulation. With the development of national economy, the demand of electric power is higher and higher, and the electric wire and the electric cable are used as one of transmission carriers of the electric power, so that the electric wire and the electric cable are applied more and more, and the coverage range is wider and wider.

Because the environment of laying of cable is different, the length of cable is longer relatively during laying, needs manual work or machine to pull the cable at the in-process of laying to pull, and the axial tensile force that the cable received this moment is great, will lead to the cable to pull because of excessively pulling and take place the problem that inner core was interrupted or the cortex broke at the in-process of laying.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides a polyvinyl chloride fireproof pressure-resistant wire cable, which comprises:

the cable comprises a conductor core group formed by twisting a plurality of conductor cores, wherein the outer wall of the conductor core group is coated with an insulating layer so as to form a conductor with a circular section, and the four conductors are arranged in a tangent mode in pairs and wound into a cable together with filling ropes distributed on the outer side of the conductor core group by a polyester belt to form a conductor unit with a circular section;

wherein, the outer wall of the conductor unit is coated with a protective layer;

the protective layer comprises an elastic supporting layer and a steel wire thin rope embedded in the elastic supporting layer, and the steel wire thin rope is twisted on the periphery of the outer wall of the conductor unit so as to enhance the axial tensile resistance of the cable;

the elastic supporting layer is arranged to be a silicone rubber layer coated on the outer side of the steel wire thin rope, so that when the outside of the cable is pressed along the radial direction, the silicone rubber layer deforms to absorb the external pressure;

and the outer side of the protective layer is sequentially provided with a flame-retardant layer and an outer sheath.

Preferably, the outer wall of the conductor unit is provided with a carbide layer, and the thickness of the carbide layer is less than or equal to 2 mm.

Preferably, the carbide layer is a silicon carbide layer.

Preferably, the number of the steel wire thin ropes is 6-12, and the steel wire thin ropes are uniformly distributed on the peripheral side of the conductor unit in a twisted manner.

Preferably, the steel wire thin rope is formed by stranding a plurality of steel wires with the diameter of 0.5mm, and each strand has the diameter of 1-2 mm.

Preferably, the thickness of the silicone rubber layer is 2-3mm, and the steel wire string is positioned at the middle layer of the silicone rubber layer.

Preferably, the thickness of the flame retardant layer is 0.3 to 0.5 mm.

Preferably, the outer sheath comprises a layer of PVC or polyvinyl chloride, having a thickness of 0.5-0.7 mm.

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

the outer wall of the conductor unit of the polyvinyl chloride wire cable is provided with the protective layer, the protective layer comprises the steel wire thin rope and the elastic supporting layer coated on the outer side of the steel wire thin rope, the cable can play a certain buffering role when being impacted by external force, the radial compression protection can be provided for the conductor unit, the compression resistance of the cable is improved to a certain extent, the steel wire thin rope has high tensile strength, fatigue resistance and impact toughness, the steel wire thin rope is arranged on the outer side of the conductor unit, and the elastic supporting layer coated on the outer wall can provide double protection of radial compression resistance and axial tension resistance for the conductor unit.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural view of a polyvinyl chloride electric wire cable according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a protective layer according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional structure of a conductor unit according to an embodiment of the present invention.

Detailed Description

In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.

In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the utility model. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.

The cable that present cable was originally whole when dispatching from the factory is generally around rolling up on the cable drum, because the environment of laying of cable is different, the length of cable is longer relatively when laying, need artifical or machine to pull the cable and lay the assigned position with the cable at the in-process that lays, especially in assembly process and line processing procedure, the axial tension that the cable received this moment is great, will lead to the cable to draw the problem that takes place inner core interrupt or cortex rupture because of excessively dragging at the laying process.

Meanwhile, in the use process of the cable, the cable insulation or the cable core is easily damaged due to external extrusion acting force, and the signal and power transmission effect of the cable is influenced. In the prior art, in order to improve the compression resistance of the cable, the thickness of a cable sheath is increased or a pipeline is arranged outside the cable generally during laying, but the cable is too thick and too hard to be influenced by the measures, the pipeline is exposed outside for a long time, water and humidity are accumulated inside the cable after the cable is weathered and damaged, and the cable is very unfavorable for long-term use.

In order to overcome the defects in the prior art, the embodiment shown in fig. 1 is combined to provide a polyvinyl chloride fireproof and pressure-resistant electric wire and cable, which includes a conductor unit 1, a protective layer 2, a flame-retardant layer 3 and an outer sheath 4.

The conductor unit 1 comprises a conductor core group 11 formed by twisting a plurality of conductor cores, the outer wall of the conductor core group 11 is coated with an insulating layer 12 to form a conductor with a circular section, the conductors are arranged in a pairwise tangent mode and wound into a cable together with filling ropes 13 distributed on the outer side of the conductors by polyester belts 14 to form a cable-forming shape with a round section.

In an alternative embodiment, the conductor core set 11 is an oxygen-free copper conductor, stable and having better electrical conductivity.

The insulating layer 12 is made of cross-linked polyethylene with the thickness of 0.45-3.25mm, the original good insulating property of PE is kept, the insulating resistance is further increased, and the insulating property is good.

The filling rope 13 is a PP rope, has good electrical insulation and flexibility, can not be rotten after being filled in the cable for a long time, and increases environmental protection and flexibility. In the embodiment of the utility model, the cross section of the PP rope body is circular in outline, so that the filling effect is good, and the roundness of the wire core is effectively ensured.

The polyester tape 14 is made of PTFE, has excellent corrosion resistance and excellent tensile strength by being transversely wrapped, and thus the solid conductor unit 1 wound with the polyester tape 14 is round and has a certain tensile property.

Combine shown in fig. 1 and fig. 2, in order to prevent that the cable from receiving extrusion force effect conductor unit 1 when external force extrudees, the outer wall cladding at conductor unit 1 has carbide layer 15, adopt the mode of production limit coating in the preparation process of cable, form carbide layer 15 at conductor unit 1's outer wall, both have good toughness and intensity, restriction inoxidizing coating 2 receives the deformation volume of external force extrusion inward contraction, the cladding is at conductor unit 1 outer wall, not only can protect conductor unit 1 when receiving external force extrusion effect as the supporting layer, still accelerate conductor unit 1's radiating rate to a certain extent, it has good fire behaviour and high temperature resistance. In the actual manufacturing design, the conductor unit 1 is too hard due to more carbide, so that the cable is not easy to bend in the using process, and in order to ensure the normal laying of the cable, the coating thickness of the carbide layer 15 is less than or equal to 2mm, and the layer thickness is 1-2 mm.

In the embodiment of the utility model, because the current electric wires and cables are wound and transported by the cable reel when being delivered from a factory and the distance between the electric wires and cables when being laid and used is long, the cable is inevitably required to be dragged and stretched in the laying process so as to be laid in place, and because the laying environment of the electric wire and the cable is complicated and is easy to be subjected to external extrusion acting force, therefore, excessive stretching and pressing of the wire may cause the outer insulation sheath to be cracked or the core to be broken, resulting in short circuit or insulation breakdown of the cable, which is a key cause other than the electrical failure caused by the structural design of the cable itself, as shown in fig. 1, 2 and 3, in order to enhance the radial compression resistance and axial tensile resistance of the cable, so that the cable is not damaged by the extrusion action force when being extruded by external force, the cable core is not broken due to over-stretching when laying and routing, the outer wall of the conductor element is coated with a protective layer 2 for providing radial compression resistance and axial tensile protection to the conductor element 1.

The protective layer 2 comprises an elastic supporting layer 22 and a steel wire string 21 embedded in the elastic supporting layer 22.

In a preferred embodiment, the steel wire strings 21 are arranged to be 6-12, are formed by twisting a plurality of tinned steel wires with the diameter of 0.5mm, are uniformly distributed on the periphery of the conductor unit 1, have high tensile strength, fatigue resistance and impact toughness, are used for enhancing the axial tensile resistance of the cable, have good corrosion resistance, and can normally work in severe environments with various harmful media.

Preferably, the diameter of the stranded steel wire rope 21 is 1-2mm, preferably 1.5 mm.

So, avoid at the laying process of cable, because of the overstretching of cable, lead to the cable core fracture of cable, improved the axial tensile property of cable to a certain extent.

Furthermore, the elastic supporting layer 22 is a silicone rubber layer coated on the outer side of the steel wire thin rope 21, and the thickness is 2-3mm, so that good elasticity, deformability and tensile resistance are ensured, large deformation can be generated under the action of small external force, and the original shape can be recovered after the external force is removed. In this embodiment, the elastic supporting layer 22 is extruded outside the steel wire string 21 and coated on the outer wall of the conductor unit 1, so that when the outside of the cable is extruded in the radial direction, the silicone rubber layer deforms to absorb the external extrusion force, and when the cable is impacted by external force, the cable can play a certain role in buffering, and the cable has the function of absorbing deformation by dispersing pressure through self deformation. So, can play the cushioning effect when the cable receives outside extrusion impact force, give conductor unit 1 and provide radial resistance to compression protection, improve the radial compressive capacity of cable to a certain extent.

In an alternative embodiment, as shown in fig. 1, the carbide layer 15 is disposed between the elastic buffer layer 22 and the conductor unit 1, the elastic buffer layer 22 is compressed by an external force to buffer and disperse the compression force, and the carbide layer 15 plays a role of supporting and protecting. Thus, the carbide layer 15 is combined with the elastic buffer layer 22, and when the external extrusion acting force is applied, the carbide layer 15 can limit the deformation amount of the elastic buffer layer 22 which is extruded by the external force and contracts inwards, so that the anti-extrusion effect of the internal support and the external buffer is achieved.

In an alternative embodiment, as shown in fig. 1, in order to improve the flame retardant performance of the cable, the outer wall of the protective layer 2 is coated with a flame retardant layer 3.

In a preferred example, the flame-retardant layer 3 can be a flame-retardant coating of the prior art, such as a flame-retardant coating of bromide sprayed on antimony trioxide, with a thickness of 0.3-0.5mm, which has a flame-retardant effect and improves the flame-retardant effect of the cable.

In an optional embodiment, the flame-retardant layer 3 can also be transversely wrapped by a mica tape, the mica tape has excellent high-temperature resistance and combustion resistance and good flexibility and tensile strength, the mica tape is wrapped on the outer wall of the protective layer 2, the overall flexibility and bending property of the cable are not affected, and the cable has certain flame-retardant property.

Further, the flame retardant layer 3 is not limited to the flame retardant coating and the mica tape provided in the present embodiment, and other flame retardant materials with flame retardant function, which can be used in cable structure, such as glass fiber wrapping tape, fire retardant coating, etc. may also be used.

As shown in fig. 1, the outer wall of the flame retardant layer 3 is extruded with an outer sheath 4.

Preferably, the outer sheath 4 is a polyvinyl chloride layer, and has good heat resistance, flame retardant property and insulating property.

Therefore, the outer sheath 4 made of the polyvinyl chloride material has the advantages of long service life, heat aging resistance, excellent heat resistance, flame retardance and excellent insulating property.

In alternative embodiments, the outer wall of the outer sheath 4 may also be coated with a bituminous or uv-protective coating.

By combining the above embodiment, the protective layer 2 is arranged on the outer wall of the conductor unit 1, the protective layer 2 includes the steel wire string 21 and the elastic buffer layer 22 coated on the outer side of the steel wire string 21, and when the cable is impacted by external force, the cable can play a certain buffering role, and can provide radial compression protection for the conductor unit 1, and improve the compression resistance of the cable to a certain extent, and the steel wire string 21 has high tensile strength, fatigue resistance and impact toughness, and is arranged on the outer side of the conductor unit 1, and by combining the elastic buffer layer 22 coated on the outer wall, the cable can provide dual protection of radial compression and axial tension for the conductor unit 1.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A fireproof pressure-resistant electric wire cable is characterized by comprising:

the protective layer comprises an elastic supporting layer and a steel wire thin rope arranged in the elastic supporting layer, and the steel wire thin rope is twisted on the periphery of the outer wall of the conductor unit to enhance the axial tensile resistance of the cable;

the elastic supporting layer is a silicone rubber layer coated on the outer side of the steel wire thin rope;

and the outer side of the protective layer is also sequentially provided with a flame-retardant layer and an outer sheath.

2. The fire-proof and pressure-resistant electric wire and cable according to claim 1, wherein a carbide layer is fixedly provided on an outer wall of the conductor unit, and a thickness of the carbide layer is 2mm or less.

3. The fire-proof, pressure-resistant electric wire and cable according to claim 2, wherein the carbide layer is a silicon carbide layer.

4. The fire-proof, pressure-resistant electric wire cable according to claim 1, wherein the number of the steel wire strings is 6 to 12, and the steel wire strings are uniformly twisted and distributed on the peripheral side of the conductor unit.

5. The fire-proof pressure-resistant electric wire and cable according to claim 1, wherein the steel wire rope is formed by twisting a plurality of steel wires with a diameter of 0.5mm into a strand, and each strand has a diameter of 1-2 mm.

6. The fire-proof pressure-resistant electric wire and cable as claimed in claim 1, wherein the thickness of the silicone rubber layer is 2-3mm, and the steel wire string is located at the middle position of the silicone rubber layer.

7. The fire-proof pressure-resistant electric wire and cable according to claim 1, wherein the thickness of the flame retardant layer is 0.3-0.5 mm.

8. A fire-proof pressure-resistant electric wire and cable according to any one of claims 1 to 7, wherein the outer sheath comprises a PVC or polyvinyl chloride layer having a thickness of 0.5 to 0.7 mm.