Wear-resistant flame-retardant polypropylene power cable

Abstract

The utility model discloses a wear-resistant flame-retardant polypropylene power cable, which comprises a cable core, the cable core comprises three wire cores and a filling layer, the outside of the cable core is provided with a belting layer, the belting layer is attached to the cable core, the outside of the belting layer is provided with an inner sheath, the inner sheath and the belting layer are formed through extrusion, and the filling layer is arranged between the inner sheath and the belting layer. The power cable comprises an inner sheath, an armor layer is arranged outside the inner sheath, the armor layer is connected with the inner sheath in an attached mode, a composite flame-retardant layer is arranged outside the armor layer, an outer sheath is arranged outside the composite flame-retardant layer, the armor layer, the composite flame-retardant layer and the outer sheath are formed in an extrusion mode, and the outer sheath of the power cable is formed by polypropylene in an extrusion mode. The nylon cloth is embedded in the polypropylene layer, so that the wear resistance is improved, the wear of the outer sheath can be inhibited, the raised wear-resistant strips arranged outside can be worn firstly, the outer sheath is protected, and the wear-resistant effect of the power cable is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a wear-resistant and flame-retardant polypropylene power cable. Background Art

[0002] Cable is a wire made of one or more mutually insulated conductors and an outer insulating protective layer, which is laid underground or in the air. There are usually two types of cables: power cables and control cables. Power cables are mainly used for the transmission and distribution of electric energy. Power cables are cable products used to transmit and distribute high-power electric energy in the trunk lines of the power system. The basic structure of power cables consists of four parts: core, insulation layer, shielding layer and protective layer. They are often used in urban underground power grids, power station lead-out lines, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. It has many product types and a wide range of applications, involving industries such as electricity, construction, communications, and manufacturing, and is closely related to all sectors of the national economy.

[0003] The Chinese patent publication number is CN218274083U, and the authorization announcement date is January 10, 2023. An environmentally friendly polypropylene insulated flame-retardant power cable is characterized by comprising: three twisted cables, a flame-retardant tape layer wrapped around the cables, a flame-retardant isolation layer wrapped outside the flame-retardant tape layer, a metal armor layer wrapped outside the flame-retardant isolation layer, and a flame-retardant outer sheath wrapped outside the metal armor layer, wherein: polypropylene filler is filled between the flame-retardant tape layer and the three twisted cables. The utility model environmentally friendly polypropylene insulated power cable has excellent electrical performance, low smoke, halogen-free, and flame-retardant properties, which can reduce production costs, shorten production cycles, and reduce environmental pollution. It is green and environmentally friendly.

[0004] The outer sheath of the existing power cable is extruded from polypropylene, which has poor wear resistance and is subject to friction and wear during use. Excessive wear of the outer sheath will cause the internal conductor core to be exposed, posing a safety hazard and reducing the service life of the power cable, and cannot meet the use requirements. Utility Model Content

[0005] The utility model aims to provide a wear-resistant and flame-retardant polypropylene power cable to solve the problem in the above-mentioned background technology that the outer sheath of the existing power cable is formed by extrusion of polypropylene, the wear resistance of polypropylene is poor, and it is worn by friction during use. Excessive wear of the outer sheath will cause the internal conductor core to be exposed, which poses a safety hazard, reduces the service life of the power cable, and cannot meet the use requirements.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a wear-resistant flame-retardant polypropylene power cable, comprising a cable core, the cable core comprising a wire core and a filling layer, three wire cores are arranged, a tape layer is arranged on the outside of the cable core, and the tape layer is fitted with the cable core, an inner sheath is arranged on the outside of the tape layer, and the inner sheath and the tape layer are formed by extrusion, an armor layer is arranged on the outside of the inner sheath, and the armor layer is fitted and connected to the inner sheath, a composite flame-retardant layer is arranged on the outside of the armor layer, an outer sheath is arranged on the outside of the composite flame-retardant layer, and the armor layer, the composite flame-retardant layer and the outer sheath are formed by extrusion.

[0007] Preferably, the wire core includes a conductor, a shielding layer and an insulating layer, the conductor is formed by twisting a plurality of copper wires, and the cross-section of the conductor is arranged in a trapezoidal shape, the shielding layer is arranged outside the conductor, the insulating layer is arranged outside the shielding layer, and the conductor, the shielding layer and the insulating layer are formed by extrusion.

[0008] Preferably, the outer sheath comprises a polypropylene layer, a nylon cloth and a steel wire mesh, the nylon cloth is arranged inside the polypropylene layer, and the nylon cloth and the polypropylene layer are inlaid, the polypropylene layer is arranged outside the steel wire mesh, and the polypropylene layer and the steel wire mesh are formed by extrusion.

[0009] Preferably, the outer part of the outer sheath is provided with raised wear-resistant strips, at least six raised wear-resistant strips are provided, and the raised wear-resistant strips are arranged equidistantly on the outer part of the outer sheath, and the raised wear-resistant strips are provided as a whole with the outer sheath.

[0010] Preferably, the composite flame retardant layer includes a polytetrafluoroethylene layer and a ceramic silicone rubber layer, the polytetrafluoroethylene layer is arranged on the outside of the ceramic silicone rubber layer, and the polytetrafluoroethylene layer and the ceramic silicone rubber layer are extrusion molded, the polytetrafluoroethylene layer is bonded to the steel wire mesh, and the ceramic silicone rubber layer is bonded to the armor layer.

[0011] Preferably, the three cores are equidistantly arranged in a triangle inside the cable core, the filling layer is arranged in the gap between the three cores, and the filling layer is made of rubber resin, the wrapping layer is made of mica paper, and the wrapping layer is spirally wound and connected on the outside of the cable core.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model device is provided with raised wear-resistant strips, nylon cloth and steel wire braided mesh. The raised wear-resistant strips are protrudingly arranged outside the outer sheath. When the power cable contacts with foreign objects, it contacts with the raised wear-resistant strips first. The outer sheath will be worn only after the raised wear-resistant strips are worn, which plays a protective role on the outer sheath and improves the wear resistance of the power cable. The nylon cloth is embedded in the interior of the polypropylene layer to increase the wear resistance of the polypropylene layer. When the outer sheath is worn to the nylon cloth, the wear of the polypropylene layer can be suppressed. After the polypropylene layer is completely worn, the steel wire braided mesh plays a protective role on the composite flame-retardant layer, which can effectively prevent the internal conductor core from being exposed, thereby improving the safety of the power cable.

[0014] The utility model device is provided with a composite flame retardant layer, and the composite flame retardant layer is a double-layer structure consisting of a polytetrafluoroethylene layer and a ceramic silicone rubber layer. The polytetrafluoroethylene layer has good high temperature resistance, and the ceramic silicone rubber layer has excellent fire prevention, flame retardancy, low smoke, and non-toxic properties. When burning, it can form a dense and hard ceramic layer, which can hinder the further spread of flames, play a better protective role in fires, and have a better flame retardant effect on power cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a cross-sectional view of the wire core of the utility model;

[0017] Figure 3 This is a cross-sectional view of the outer sheath of the utility model;

[0018] Figure 4 This is a cross-sectional view of the composite flame retardant layer of the utility model.

[0019] In the figure: 1. Cable core; 2. Wire core; 3. Filling layer; 4. Tape layer; 5. Inner sheath; 6. Armor layer; 7. Composite flame retardant layer; 8. Outer sheath; 9. Raised wear-resistant strip; 10. Conductor; 11. Shielding layer; 12. Insulation layer; 13. Polypropylene layer; 14. Nylon cloth; 15. Steel wire braided mesh; 16. Polytetrafluoroethylene layer; 17. Ceramic silicone rubber layer. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] See also Figure 1-4The utility model provides an embodiment: a wear-resistant and flame-retardant polypropylene power cable, comprising a cable core 1, the cable core 1 comprising a wire core 2 and a filling layer 3, three wire cores 2 are provided, a tape layer 4 is provided on the outside of the cable core 1, and the tape layer 4 is fitted with the cable core 1, an inner sheath 5 is provided on the outside of the tape layer 4, and the inner sheath 5 and the tape layer 4 are formed by extrusion, an armor layer 6 is provided on the outside of the inner sheath 5, and the armor layer 6 is fitted and connected to the inner sheath 5, a composite flame-retardant layer 7 is provided on the outside of the armor layer 6, an outer sheath 8 is provided on the outside of the composite flame-retardant layer 7, and the armor layer 6, the composite flame-retardant layer 7 and the outer sheath 8 are formed by extrusion.

[0022] See also Figure 1 and Figure 2 The core 2 includes a conductor 10, a shielding layer 11 and an insulating layer 12. The conductor 10 is formed by twisting a plurality of copper wires, and the cross-section of the conductor 10 is arranged in a trapezoidal shape. The shielding layer 11 is arranged on the outside of the conductor 10, and the insulating layer 12 is arranged on the outside of the shielding layer 11. The conductor 10, the shielding layer 11 and the insulating layer 12 are formed by extrusion. The shielding layer 11 and the insulating layer 12 are sequentially wrapped on the outside of the conductor 10 to form the core 2, and the core 2 has shielding and insulating effects.

[0023] See also Figure 1 and Figure 3 The outer sheath 8 includes a polypropylene layer 13, a nylon cloth 14 and a steel wire braided mesh 15. The nylon cloth 14 is arranged inside the polypropylene layer 13, and the nylon cloth 14 and the polypropylene layer 13 are inlaid. The polypropylene layer 13 is arranged outside the steel wire braided mesh 15, and the polypropylene layer 13 and the steel wire braided mesh 15 are formed by extrusion. The nylon cloth 14 is inlaid inside the polypropylene layer 13 to increase the wear resistance of the polypropylene layer 13. When the outer sheath 8 wears to the nylon cloth 14, the wear of the polypropylene layer 13 can be suppressed. After the polypropylene layer 13 is completely worn, the steel wire braided mesh 15 protects the composite flame retardant layer 7, which can effectively prevent the internal conductor core from being exposed, thereby improving the safety of the power cable.

[0024] See also Figure 1 and Figure 3 The outer part of the outer sheath 8 is provided with raised wear-resistant strips 9, at least six of which are equidistantly arranged on the outside of the outer sheath 8, and the raised wear-resistant strips 9 are integrated with the outer sheath 8. The raised wear-resistant strips 9 are protrudingly arranged on the outside of the outer sheath 8, so that when the power cable contacts with foreign objects, it contacts with the raised wear-resistant strips 9 first, and the outer sheath 8 will be worn only after the raised wear-resistant strips 9 are worn, which plays a protective role on the outer sheath 8 and indirectly improves the wear resistance of the power cable.

[0025] See also Figure 1 and Figure 4The composite flame retardant layer 7 includes a polytetrafluoroethylene layer 16 and a ceramic silicone rubber layer 17. The polytetrafluoroethylene layer 16 is arranged on the outside of the ceramic silicone rubber layer 17, and the polytetrafluoroethylene layer 16 and the ceramic silicone rubber layer 17 are formed by extrusion. The polytetrafluoroethylene layer 16 is bonded to the steel wire mesh 15, and the ceramic silicone rubber layer 17 is bonded to the armor layer 6. The polytetrafluoroethylene layer 16 has good high temperature resistance, and the ceramic silicone rubber layer 17 has excellent fire prevention, flame retardancy, low smoke, non-toxicity and other characteristics. When burning, it can form a dense and hard ceramic layer, which can hinder the further spread of flames, play a better protective role in fires, and have a better flame retardant effect on power cables.

[0026] See also Figure 1 The three cores 2 are arranged equidistantly in a triangle inside the cable core 1, the filling layer 3 is arranged in the gap between the three cores 2, and the filling layer 3 is made of rubber resin, the wrapping layer 4 is made of mica paper, and the wrapping layer 4 is spirally wound and connected on the outside of the cable core 1.

[0027] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wear-resistant flame-retardant polypropylene power cable, comprising a cable core (1), characterized in that: The cable core (1) comprises a wire core (2) and a filling layer (3), wherein three wire cores (2) are provided, a tape layer (4) is provided on the outside of the cable core (1), and the tape layer (4) is in contact with the cable core (1), an inner sheath (5) is provided on the outside of the tape layer (4), and the inner sheath (5) and the tape layer (4) are formed by extrusion, an armor layer (6) is provided on the outside of the inner sheath (5), and the armor layer (6) is in contact with the inner sheath (5), a composite flame retardant layer (7) is provided on the outside of the armor layer (6), an outer sheath (8) is provided on the outside of the composite flame retardant layer (7), and the armor layer (6), the composite flame retardant layer (7) and the outer sheath (8) are formed by extrusion.

2. The wear-resistant flame-retardant polypropylene power cable according to claim 1, characterized in that: The wire core (2) comprises a conductor (10), a shielding layer (11) and an insulating layer (12); the conductor (10) is formed by twisting a plurality of copper wires, and the cross-section of the conductor (10) is arranged in a trapezoidal shape; the shielding layer (11) is arranged outside the conductor (10); the insulating layer (12) is arranged outside the shielding layer (11); and the conductor (10), the shielding layer (11) and the insulating layer (12) are formed by extrusion.

3. The wear-resistant flame-retardant polypropylene power cable according to claim 1, characterized in that: The outer sheath (8) comprises a polypropylene layer (13), a nylon cloth (14) and a steel wire braided mesh (15); the nylon cloth (14) is arranged inside the polypropylene layer (13), and the nylon cloth (14) and the polypropylene layer (13) are inlaid; the polypropylene layer (13) is arranged outside the steel wire braided mesh (15), and the polypropylene layer (13) and the steel wire braided mesh (15) are formed by extrusion.

4. The wear-resistant flame-retardant polypropylene power cable according to claim 1, characterized in that: The outer portion of the outer sheath (8) is provided with raised wear-resistant strips (9), at least six raised wear-resistant strips (9) are provided, and the raised wear-resistant strips (9) are arranged equidistantly outside the outer sheath (8), and the raised wear-resistant strips (9) are arranged as a whole with the outer sheath (8).

5. The wear-resistant flame-retardant polypropylene power cable according to claim 1, characterized in that: The composite flame retardant layer (7) comprises a polytetrafluoroethylene layer (16) and a ceramic silicone rubber layer (17); the polytetrafluoroethylene layer (16) is arranged outside the ceramic silicone rubber layer (17); the polytetrafluoroethylene layer (16) and the ceramic silicone rubber layer (17) are formed by extrusion; the polytetrafluoroethylene layer (16) is bonded to the steel wire braided mesh (15); and the ceramic silicone rubber layer (17) is bonded to the armor layer (6).

6. The wear-resistant flame-retardant polypropylene power cable according to claim 1, characterized in that: The three wire cores (2) are arranged equidistantly in a triangle inside the cable core (1); the filling layer (3) is arranged in the gaps between the three wire cores (2); the filling layer (3) is made of rubber resin; the tape layer (4) is made of mica paper; and the tape layer (4) is spirally wound and connected to the outside of the cable core (1).

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