CN221899782U - A torsion-resistant cable - Google Patents

Abstract

The utility model discloses an anti-torsion cable, which comprises a cable core, a functional layer and a protective layer, wherein the functional layer wraps the cable core, the protective layer wraps the functional layer, the functional layer comprises a special-shaped supporting layer, an elastic supporting tube, an armor layer and a wrapping layer, the special-shaped supporting layer is provided with a plurality of arc structures contacted with the wrapping layer, the elastic supporting tube is arranged between adjacent arc structures and contacted with the wrapping layer, the wrapping layer wraps the outer side of the armor layer, and the armor layer is paved on the outer side of the cable core; according to the utility model, by adding the functional layer, the torsion resistance, compression resistance and tensile resistance of the cable are improved, and the service life of the cable is prolonged.

Description

A torsion-resistant cable

Technical Field

The utility model belongs to the field of cables, in particular to a torsion-resistant cable.

Background Art

Power cable is a device used to transmit electricity, usually consisting of an inner conductor and an outer insulating sheath. It is widely used in many fields such as aerospace, transportation, and construction.

Most of the cables used in the existing construction field are cross-linked polyethylene and polyvinyl chloride cables, which have problems such as rapid decline in electrical insulation performance, poor anti-interference ability, and poor mechanical properties. In the prior art, a variety of solutions have been proposed to address these problems, such as the cable structure provided in the prior art CN110690008A (as shown in FIG1 ): from the inside to the outside, there are tinned copper metal monofilaments 10, high-strength aramid fiber 20, inner semi-conductive shielding layer 30, (prior art) insulating layer 40, outer semi-conductive shielding layer 50, tinned copper metal monofilaments 60, polyimide film layer 70, and sheath 80. After the improvement of the prior art, the electrical insulation performance, anti-interference performance, and mechanical performance are significantly improved.

However, in the actual application of cables, especially in the application of concealed lines, there are many right angles in the actual laying scenarios, and the bending and compression of the cables are inevitable. In addition, the cables will be subjected to tension, compression and torsion during the laying process. After the cable is installed, these stresses are retained. Under the long-term action of various stresses, the stability of the cable operation and its life cycle are affected.

Utility Model Content

In order to solve the above-mentioned deficiencies in the prior art, the present application discloses a torsion-resistant cable, comprising a wire core, a functional layer, and a protective layer, wherein the functional layer wraps the wire core, and the protective layer wraps the functional layer. The functional layer comprises a special-shaped supporting layer, an elastic supporting tube, an armor layer and a wrapping layer. The special-shaped supporting layer is provided with a plurality of arc structures in contact with the wrapping layer, the elastic supporting tube is arranged between adjacent arc structures and in contact with the wrapping layer, the wrapping layer is wrapped around the outside of the armor layer, and the armor layer is laid on the outside of the wire core.

The wire core comprises a twisted multi-core conductor, an inner shielding layer, a polypropylene insulation layer, and an outer shielding layer. The inner shielding layer is wrapped around the outer side of the twisted multi-core conductor, the polypropylene insulation layer is wrapped around the outer side of the inner shielding layer, and the outer shielding layer is wrapped around the outer side of the polypropylene insulation layer.

The twisted multi-core conductor is formed by twisting multiple copper wires of the same diameter in the same direction.

The armor layer includes steel wires.

The elastic supporting tube is a hollow tube.

The multiple arc-shaped structures of the special-shaped supporting layer are symmetrically arranged.

The plurality of arc-shaped structures all contact the outer surface of the wrapping layer.

The elastic support tube is arranged between the plurality of arc structures.

There are a plurality of elastic support tubes, and all of the elastic support tubes are in contact with the outer surface of the wrapping layer.

The arc-shaped structure is located on the inner side of the special-shaped supporting layer, and the outer surface of the special-shaped supporting layer is wrapped by the protective layer.

This application has the following advantages:

Specifically, the special-shaped support layer 8 in the functional layer 11 has high strength and high toughness, and has tensile, compressive and supporting effects on the wire core 10;

Specifically, the elastic support tube 7 in the functional layer 11 is a hollow tube with high elasticity, which provides a certain buffering function for the wire core 10 when it is compressed by external force;

Specifically, the wrapping layer 6 in the functional layer 11 has high strength and low friction properties, so that the outer elastic support tube 7 and the special-shaped support layer 8 can rotate when subjected to large-scale twisting, thereby protecting the wire core 10 from twisting;

Specifically, the armor layer 5 in the functional layer 11 has high tensile strength, so as to resist the tensile force applied to the cable.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments.

FIG. 1 is a schematic diagram of a cable in the prior art.

FIG. 2 is a schematic cross-sectional view of the torsion-resistant cable of the present application.

DETAILED DESCRIPTION

The following will clearly and completely describe the technical solutions of the embodiments of the utility model; at the same time, the utility model will be further explained in conjunction with the specific drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. The following will clearly and completely describe the technical solutions of the embodiments of the present application; the orientation expressions involved in this application, such as up, down, etc., are all positioned according to the view arrangement method of the present application;

In order to solve the above-mentioned deficiencies in the prior art, the present application discloses a torsion-resistant cable, comprising a wire core, a functional layer, and a protective layer 9, wherein the functional layer wraps the wire core, and the protective layer 9 wraps the functional layer, and the functional layer comprises a special-shaped supporting layer 8, an elastic supporting tube 7, an armor layer 5 and a wrapping layer 6, wherein the special-shaped supporting layer 8 is provided with a plurality of arc structures in contact with the wrapping layer 6, the elastic supporting tube 7 is arranged between adjacent arc structures and in contact with the wrapping layer 6, the wrapping layer 6 is wrapped around the outside of the armor layer 5, and the armor layer 5 is laid on the outside of the wire core.

The wire core includes a twisted multi-core conductor 1, an inner shielding layer 2, a polypropylene insulation layer 3, and an outer shielding layer 4. The inner shielding layer 2 is wrapped around the outside of the twisted multi-core conductor 1, the polypropylene insulation layer 3 is wrapped around the outside of the inner shielding layer 2, and the outer shielding layer 4 is wrapped around the outside of the polypropylene insulation layer 3.

The twisted multi-core conductor 1 is formed by twisting multiple copper wires of the same diameter in the same direction.

The armor layer 5 comprises steel wires.

The elastic support tube 7 is a hollow tube.

The multiple arc-shaped structures of the special-shaped supporting layer 8 are symmetrically arranged.

The plurality of arc-shaped structures all contact the outer surface of the wrapping layer 6 .

The elastic support tube 7 is disposed between the plurality of arc structures.

There are multiple elastic support tubes 7 , and all of the multiple elastic support tubes 7 contact the outer surface of the wrapping layer 6 .

The arc-shaped structure is located on the inner side of the special-shaped supporting layer, and the outer surface of the special-shaped supporting layer is wrapped by the protective layer 9 .

The utility model has the following beneficial effects:

In the utility model, since the special-shaped supporting layer and the protective layer are arranged on the outside of the wire core, the raised arc structure of the special-shaped supporting layer is in tangential contact with the wire core but not connected, and the contact area is small, and the cross-section of the elastic supporting tube is circular. When the cable is subjected to a large amount of twisting during the construction and laying process, it can rotate adaptively without causing twisting of the internal wire core and damage to the wire core structure.

The utility model adopts a twisted multi-core conductor for power conduction, and the conductive wires arranged in a spiral shape can enhance the tensile and torsion resistance of the cable.

The utility model has a certain gap between the special-shaped support layer and the wrapping layer to provide the space required for cable bending or compression, and the elastic support tube is an elastic hollow structure, which can provide the buffering and deformation required during bending and compression, greatly reducing the damage caused by extrusion of the cable and improving the reliability of the cable during actual operation.

The utility model adopts polypropylene as the insulating layer material of the cable, which further improves the electrical insulation performance and long-term operating temperature of the cable. At the same time, it can be recycled and reused. In addition to meeting conventional performance requirements, it is more environmentally friendly.

In summary, the utility model cooperates with each other in terms of the arrangement sequence, structural design and material optimization of the protective layer, functional layer and wire core, reduces the cable maintenance cost and potential safety hazards, and realizes the requirements of a thermoplastic insulated cable with long service life, which is resistant to compression, tension and torsion for construction.

Preferably, the inner shielding layer and the outer shielding layer are mainly composed of polypropylene with conductive fillers added.

Preferably, the polypropylene insulation layer is composed mainly of polypropylene material.

Preferably, the armor layer is fine steel wire armor.

Preferably, the wrapping layer is polytetrafluoroethylene.

Preferably, the elastic support tube is made of TPU material.

Preferably, the special-shaped support layer is made of isotactic polypropylene and has mesh tensile reinforcements arranged inside.

Preferably, the protective layer is a low-smoke halogen-free flame retardant sheath.

Preferably, when the compression, tensile and torsion-resistant long-life thermoplastic insulated cable for construction contains two or more cores, PP flame-retardant strips should be filled between the cores, and the two or more cores are wrapped together by a PP flame-retardant wrapping tape, and the PP flame-retardant wrapping tape is wrapped by an armor layer.

Embodiment 1

Please refer to Figure 2, which is a schematic diagram of the cross-sectional structure of a compression-resistant, tensile-resistant, torsion-resistant, long-life thermoplastic insulated cable for construction provided by an embodiment of the utility model. A compression-resistant, tensile-resistant, torsion-resistant, long-life thermoplastic insulated cable for construction, comprising a wire core, a functional layer and a protective layer 9, wherein the protective layer 9 is wrapped around the outside of the functional layer, wherein the functional layer comprises a special-shaped support layer 8, an elastic support tube 7, a wrapping layer 6 and an armor layer 5, wherein the special-shaped support layer 8 is provided with a plurality of arc structures in contact with the wrapping layer 6, wherein the elastic support tube 7 is provided between adjacent arc structures and in contact with the wrapping layer 6, wherein the wrapping layer 6 is wrapped around the outside of the armor layer 5, wherein the armor layer 5 is laid on the outside of the wire core,

The wire core includes a twisted multi-core conductor 1, an inner shielding layer 2, a polypropylene insulation layer 3, and an outer shielding layer 4. The inner shielding layer 2 is wrapped around the outside of the twisted multi-core conductor 1, the polypropylene insulation layer 3 is wrapped around the outside of the inner shielding layer 2, and the outer shielding layer 4 is wrapped around the outside of the polypropylene insulation layer 3.

Specifically, the special-shaped support layer 8 in the functional layer has high strength and high toughness, and has tensile, compressive and supporting effects on the wire core;

Specifically, the elastic support tube 7 in the functional layer is a hollow tube with high elasticity, which provides a certain buffering function for the wire core when it is compressed by external force;

Specifically, the wrapping layer 6 in the functional layer has high strength and low friction properties, so that the elastic support tube 7 and the special-shaped support layer 8 of the outer layer can rotate when subjected to large-scale twisting, thereby protecting the wire core from twisting;

Specifically, the armor layer 5 in the functional layer has high tensile strength, so as to resist the tensile force applied to the cable.

Specifically, the inner shielding layer 2 in the wire core eliminates the increase in local electric field strength on the conductor surface caused by the roughness of the conductor surface, and the outer shielding layer 4 further shields the electric field, both of which improve the anti-interference ability of the cable during operation.

Specifically, the polypropylene insulation layer 3 in the wire core has higher electrical insulation performance and enhances the stability of cable operation.

Specifically, the twisted multi-core conductor 1 in the wire core is formed by regularly twisting multiple strands of copper wires of the same diameter in the same direction, and has higher tensile strength and torsional resistance than copper conductors of the same square number.

Specifically, the protective layer 9 is a low-smoke zero-halogen flame-retardant sheath, which provides flame-retardant properties for the cable. LSZH is the acronym for "Low Smoke Zero Halogen", which is used to represent non-halogenated flame-retardant cable sheath materials. This type of cable sheath material has excellent fire safety characteristics of low smoke, low toxicity, and low corrosion, and is therefore suitable for application environments such as centralized office areas, public transportation railway systems, nuclear power plants, and refineries, thereby protecting personnel and equipment from toxic and corrosive gases. This article will focus on the relevant applications of low-smoke zero-halogen network cables; the preferred low-smoke zero-halogen flame-retardant material in this application is a polyurethane material;

Working principle:

The utility model is a long-life thermoplastic insulated cable for construction that is resistant to compression, tension and torsion. A special-shaped supporting layer 8 is provided with a mesh tensile reinforcement, an armor layer 5 is a steel wire armor, and a twisted multi-core conductor 1 is formed by regularly twisting a plurality of copper wires of the same diameter in the same direction, forming an inner, middle and outer tensile structure of the cable, which can effectively improve the tensile resistance of the cable.

There is a certain gap between the special-shaped support layer 8 and the wrapping layer 6 and the elastic support tube 7, and the elastic support tube 7 is a hollow structure. The external extrusion is transmitted to the special-shaped support layer 8 through the protective layer 9, causing the special-shaped support layer 8 to deform. The elastic support tube 7 is deformed and flattened by the pressure of the special-shaped support layer 8, absorbs the impact force, plays a buffering role, protects the wire core, and improves the compression resistance of the cable.

The elastic support tube 7 is arranged between the arc-shaped protrusion of the special-shaped support layer 8 between the special-shaped support layer 8 and the wrapping layer 6. The special-shaped support layer 8 is connected to the wrapping layer 6 but not connected. The elastic support tube 7, the special-shaped support layer 8 and the wrapping layer 6 are connected but not connected. When subjected to external torsion, the elastic support tube 7, the special-shaped support layer 8 and the wrapping layer 6 are a whole. When the external torsion reaches a set threshold, due to the low friction of the wrapping layer 6, the elastic support tube 7 and the special-shaped support layer 8 can rotate to a certain extent with the torsion, which eliminates and alleviates the torsion of the wire core, thereby eliminating and alleviating the long-term stress state of the wire core, improving the cable's anti-twisting ability, and helping to maintain the stability of the cable in long-term operation.

The contents not described in detail in the present invention belong to the prior art known to professional and technical personnel in the field and will not be described in detail.

Claims (10)

1. A torsion-resistant cable, comprising a core, a functional layer, and a protective layer, wherein the functional layer wraps the core, and the protective layer wraps the functional layer, characterized in that the functional layer comprises a special-shaped supporting layer, an elastic supporting tube, an armor layer and a wrapping layer, the special-shaped supporting layer is provided with a plurality of arc structures in contact with the wrapping layer, the elastic supporting tube is arranged between adjacent arc structures and in contact with the wrapping layer, the wrapping layer is wrapped around the outside of the armor layer, and the armor layer is laid on the outside of the core. 2. A torsion-resistant cable according to claim 1, characterized in that the core comprises a twisted multi-core conductor, an inner shielding layer, a polypropylene insulation layer, and an outer shielding layer, the inner shielding layer is wrapped around the outside of the twisted multi-core conductor, the polypropylene insulation layer is wrapped around the outside of the inner shielding layer, and the outer shielding layer is wrapped around the outside of the polypropylene insulation layer. 3. A torsion-resistant cable according to claim 2, characterized in that the twisted multi-core conductor is formed by twisting multiple copper wires of the same diameter in the same direction. 4. A torsion-resistant cable according to claim 3, characterized in that the armor layer comprises steel wires. 5. A torsion-resistant cable according to claim 4, characterized in that the elastic support tube is a hollow tube. 6 . The torsion-resistant cable according to claim 5 , wherein the plurality of arc-shaped structures of the special-shaped supporting layer are symmetrically arranged. 7. A torsion-resistant cable according to claim 6, characterized in that the plurality of arc-shaped structures all contact the outer surface of the wrapping layer. 8. The torsion-resistant cable according to claim 7, characterized in that the elastic support tube is disposed between each of the plurality of arc-shaped structures. 9 . The torsion-resistant cable according to claim 8 , wherein there are a plurality of elastic support tubes, and the plurality of elastic support tubes all contact the outer surface of the wrapping layer. 10. The torsion-resistant cable according to claim 9, characterized in that the arc-shaped structure is located on the inner side of the special-shaped supporting layer, and the outer surface of the special-shaped supporting layer is wrapped by the protective layer.