High-temperature-resistant anti-corrosion power cable

Abstract

The utility model belongs to the field of power cables, and provides a high-temperature-resistant anti-corrosion power cable, which comprises a cable core, a filling layer, a belting layer, an inner sheath, a steel wire braided shielding layer, a steel tape armor layer and an outer sheath, the cable core comprises a central cable core and six side cable cores distributed around the central cable core, a star-shaped central sheath is arranged outside the central cable core, and the outer sheath is arranged outside the central cable core. A single-face calcined mica tape layer is arranged outside the side cable core, a first polytetrafluoroethylene film is arranged outside the single-face calcined mica tape layer, two symmetrically-distributed tensile ropes are arranged inside the filling layer, a second polytetrafluoroethylene film is arranged outside the belting layer, and a first polytetrafluoroethylene film is arranged outside the second polytetrafluoroethylene film. And a third polytetrafluoroethylene film is arranged between the steel wire braided shielding layer and the steel tape armoring layer, and the outer sheath comprises a polyvinyl chloride sheath and a polytetrafluoroethylene sheath which are nested inside and outside. The power cable is reasonable in design, simple in structure, good in stability, high in wear resistance, good in high temperature resistance, long in service life and suitable for large-scale popularization.

Description

Technical Field

[0001] The utility model belongs to the field of power cables, and in particular relates to a high temperature resistant and corrosion resistant power cable. Background Art

[0002] Power cables are used to transmit and distribute electrical energy. They are commonly used in urban underground power grids, power station lead-out lines, internal power supply for industrial and mining enterprises, and underwater transmission lines across rivers and seas. For power cables used in high temperature and corrosive environments, higher requirements are placed on the high temperature resistance and corrosion resistance of traditional power cables.

[0003] The existing patent CN208796698U discloses a high temperature resistant and corrosion resistant power cable, including a cable core, a filling layer, and a non-woven tape layer, an inner sheath, a steel wire braided shielding layer, a steel tape armor layer and a polyvinyl chloride sheath layer sequentially coated on the outside of the cable core, the polyvinyl chloride sheath layer is coated with a high temperature resistant anti-corrosion layer, and the high temperature resistant anti-corrosion layer is also coated with a fire-resistant mica tape layer, the cable core includes a wire core and a tensile core, the wire cores are twisted around the tensile core as the center, the wire core includes a conductor and an insulating layer coated on the outside of the conductor, the insulating layer is coated with a heat conductive layer, and the heat conductive layer is also coated with an aramid fiber flame retardant layer, and the cross section of the conductor is a regular hexagonal shape. Compared with the existing technology, the power cable has the advantages of high temperature resistance, corrosion resistance, strong tensile resistance, fire resistance, long service life, and high safety factor. The cable uses mica tape as the outermost protective layer, and its wear resistance is greatly reduced. Once local damage occurs, the integrity of the entire mica tape layer will be destroyed at a much faster rate, affecting the service life of the cable. Furthermore, the cable uses three cable cores. For cables with more than three cable cores inside, based on the limitation of the overall cable diameter, the combined gap between the cable cores will be appropriately reduced, which is beneficial to improving the stability of the internal structure of the cable. Secondly, the high temperature resistance of the cable still has room for improvement. By improving its high temperature resistance, it is beneficial to improve the anti-aging performance of the insulation layer, thereby ensuring the performance of the cable in high temperature environments. Utility Model Content

[0004] In view of the technical problems existing in the above-mentioned power cables, the utility model proposes a high temperature resistant and corrosion resistant power cable with reasonable design, simple structure, good stability, high wear resistance, good high temperature resistance and long service life.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is that the utility model provides a high temperature resistant and corrosion resistant power cable, including multiple cable cores, the cable cores include a plurality of conductors and an insulating layer and a shielding layer wrapped around the outside of all the conductors, and the outside of the multiple cable cores is sequentially provided with a filling layer, a tape layer, an inner sheath, a steel wire braided shielding layer, a steel tape armor layer and an outer sheath, characterized in that the number of the cable cores is 7 and they are 1 central cable core and 6 side cable cores distributed around the central cable core, and the outside of the central cable core is provided with a A star-shaped central sheath, wherein the outer periphery of the star-shaped central sheath includes 6 arc surfaces corresponding to the side cable cores one by one, a single-sided calcined mica tape layer is arranged on the outside of the side cable core, a first polytetrafluoroethylene film is arranged on the outside of the single-sided calcined mica tape layer, two symmetrically distributed tensile ropes are arranged on the inside of the filling layer, a second polytetrafluoroethylene film is arranged on the outside of the wrapping layer, a third polytetrafluoroethylene film is arranged between the steel wire braided shielding layer and the steel belt armor layer, and the outer sheath includes a polyvinyl chloride sheath and a polytetrafluoroethylene sheath nested inside and outside.

[0006] Preferably, the tensile rope comprises a plurality of steel wires twisted together.

[0007] Preferably, a fire-resistant and corrosion-resistant coating layer is provided between the polyvinyl chloride sheath and the polytetrafluoroethylene sheath.

[0008] Preferably, the thickness of the single-sided calcined mica tape layer is 0.2 mm and the mica surface thereof faces inwards, and the wrapping overlap rate of the single-sided calcined mica tape layer is less than 30%.

[0009] Preferably, the surfaces of the steel wire shielding braided shielding layer and the steel tape shielding layer are both provided with a chrome plating layer.

[0010] Compared with the prior art, the advantages and positive effects of the utility model are:

[0011] 1. The utility model provides a high temperature resistant and corrosion resistant power cable. By adopting a 6+1 cable core design, especially the outer side design of the central cable core, the internal stability of the cable can be improved. The polytetrafluoroethylene film and polytetrafluoroethylene sheath are arranged on the outside of the cable core, the outside of the tape layer, and the outside of the steel wire braided shielding layer to effectively improve the high temperature resistance of the cable and effectively prevent the premature aging of the insulation layer. The polytetrafluoroethylene sheath can also ensure that the cable has good wear resistance. The cable has reasonable design, simple structure, good stability, high wear resistance, good high temperature resistance and long service life, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 A schematic structural diagram of a high temperature resistant and corrosion resistant power cable provided in an embodiment;

[0014] In the above figures, 1. cable core; 11. central cable core; 12. side cable core; 13. star-shaped central sheath; 14. single-sided calcined mica tape layer; 15. first polytetrafluoroethylene film; 2. filling layer; 3. tape layer; 4. inner sheath; 5. steel wire braided shielding layer; 6. steel tape armor layer; 7. outer sheath; 71. polyvinyl chloride sheath; 72. polytetrafluoroethylene sheath; 8. tensile rope; 9. second polytetrafluoroethylene film; 10. third polytetrafluoroethylene film. DETAILED DESCRIPTION

[0015] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear below, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0016] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0017] Examples, such as Figure 1As shown, the utility model provides a high temperature resistant and corrosion resistant power cable, comprising a plurality of cable cores 1, the cable cores 1 comprising a plurality of conductors and an insulating layer and a shielding layer wrapped around the outside of all the conductors, and the outside of the plurality of cable cores 1 is sequentially provided with a filling layer 2, a tape layer 3, an inner sheath 4, a steel wire braided shielding layer 5, a steel tape armor layer 6 and an outer sheath 7. In order to improve the stability of the internal structure of the cable, the utility model adopts 7 cable cores 1, and respectively comprises a central cable core 71 and 6 side cable cores 72 distributed around the central cable core 71, and a star-shaped central sheath 13 is arranged outside the central cable core 71, and the outer periphery of the star-shaped central sheath 13 comprises 6 arc surfaces corresponding to the side cable cores 72 one by one. By designing the star-shaped central sheath 13 with an outer arc structure to limit the side cable cores 72 forming a planetary relationship with it, it is beneficial to improve the anti-torsion effect between the cable cores 1, and ensure that the cable maintains a high stability under the action of tension, so as to exert stable electrical performance.

[0018] On this basis, in order to improve the high temperature resistance of the cable, the utility model is provided with a single-sided calcined mica tape layer 14 on the outside of the side cable core 72, a first polytetrafluoroethylene film 15 is provided on the outside of the single-sided calcined mica tape layer 14, two symmetrically distributed tensile ropes 8 are provided inside the filling layer 2, a second polytetrafluoroethylene film 9 is provided on the outside of the wrapping layer 3, a third polytetrafluoroethylene film 10 is provided between the steel wire braided shielding layer 5 and the steel belt armor layer 6, and the outer sheath 7 includes a polyvinyl chloride sheath 71 and a polytetrafluoroethylene sheath 72 nested inside and outside. A polytetrafluoroethylene film is arranged outside the cable core 1, outside the tape layer 3, and outside the steel wire braided shielding layer 5, and the outer sheath 7 adopts a double-layer structure, including a polytetrafluoroethylene sheath 72. The polytetrafluoroethylene material is a good high-temperature resistant material. Whether it is used as a membrane structure or a sheath structure, it can effectively exert its high-temperature resistance, especially ensure the anti-aging life of the insulation layer of the cable core 1, effectively prevent the insulation layer from aging prematurely, and improve the high-temperature resistance of the cable. The polytetrafluoroethylene sheath 72, which is the outermost high-temperature resistant protective layer, can also ensure that the cable has good wear resistance, which is conducive to extending the actual service life of the cable.

[0019] In order to improve the tensile performance of the cable, the tensile rope 8 provided by the utility model includes multiple steel wires twisted together. By twisting multiple steel wires, the torsion resistance and tensile resistance of the steel wires can be effectively improved, which plays a certain auxiliary role in maintaining the tensile effect of the cable.

[0020] In order to improve the fire resistance and corrosion resistance of the cable, in addition to using a double-layer sheath as the outer protective structure, a fire-resistant and anti-corrosion coating layer is provided between the polyvinyl chloride sheath 71 and the polytetrafluoroethylene sheath 72. The fire-resistant and anti-corrosion coating can also increase the friction between the polyvinyl chloride sheath 71 and the polytetrafluoroethylene sheath 72, thereby improving the stability and tension of the two after they are combined.

[0021] In order to improve the fireproof performance of the cable core 1, the thickness of the single-sided calcined mica tape layer 14 provided by the utility model is 0.2 mm and its mica surface faces inward. The wrapping overlap rate of the single-sided calcined mica tape layer 14 is less than 30%, which can effectively cover the outer surface of the cable core 1. In addition, the calcined mica tape has greatly improved temperature resistance and insulation properties than ordinary mica tape, and has good flexibility, which is conducive to ensuring the wrapping quality.

[0022] In order to improve the corrosion resistance of the cable, the utility model chrome-plates the surface of the steel wire shielding braided shielding layer and the steel belt shielding layer, that is, the surface is plated with a chrome layer. After chrome plating, the chemical stability and heat resistance of the steel wire shielding braided shielding layer and the steel belt shielding layer can be effectively improved. The heat resistance temperature is within 500°C, which is beneficial to extending the actual service life of the cable.

[0023] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A high temperature resistant and corrosion resistant power cable, comprising a plurality of cable cores, wherein the cable cores comprise a plurality of conductors and an insulating layer and a shielding layer wrapped around the outside of all the conductors, and the outside of the plurality of cable cores are sequentially provided with a filling layer, a tape layer, an inner sheath, a steel wire braided shielding layer, a steel tape armor layer and an outer sheath, characterized in that: The number of the cable cores is 7, which include 1 central cable core and 6 side cable cores distributed around the central cable core; a star-shaped central sheath is arranged outside the central cable core; the outer periphery of the star-shaped central sheath includes 6 arc surfaces corresponding to the side cable cores one by one; a single-sided calcined mica tape layer is arranged outside the side cable core; a first polytetrafluoroethylene film is arranged outside the single-sided calcined mica tape layer; two symmetrically distributed tensile ropes are arranged inside the filling layer; a second polytetrafluoroethylene film is arranged outside the wrapping layer; a third polytetrafluoroethylene film is arranged between the steel wire braided shielding layer and the steel belt armor layer; and the outer sheath includes a polyvinyl chloride sheath and a polytetrafluoroethylene sheath nested inside and outside.

2. A high temperature resistant and corrosion resistant power cable according to claim 1, characterized in that: The tensile rope comprises a plurality of steel wires twisted together.

3. A high temperature resistant and corrosion resistant power cable according to claim 2, characterized in that: A fire-resistant and corrosion-resistant coating layer is arranged between the polyvinyl chloride sheath and the polytetrafluoroethylene sheath.

4. A high temperature resistant and corrosion resistant power cable according to claim 3, characterized in that: The thickness of the single-sided calcined mica tape layer is 0.2 mm and the mica surface thereof faces inwards. The wrapping overlap rate of the single-sided calcined mica tape layer is less than 30%.

5. A high temperature resistant and corrosion resistant power cable according to claim 4, characterized in that: The surfaces of the steel wire shielding braided shielding layer and the steel tape shielding layer are both provided with a chrome plating layer.

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