Bending-resistant and distortion-resistant power cable

Abstract

The utility model discloses an anti-bending distortion-resistant power cable, which comprises a cable core, the cable core comprises wire cores and a filling layer, a middle support core is arranged among the five wire cores, the middle support core is arranged at the central position of the cable core, a wrapping layer is arranged outside the cable core, an inner protective layer is arranged outside the wrapping layer, and an outer protective layer is arranged outside the inner protective layer. The outer portion of the inner protection layer is provided with a steel tape armoring layer, the outer portion of the steel tape armoring layer is provided with a bending-resistant and twisting-resistant layer, the outer portion of the bending-resistant and twisting-resistant layer is provided with an outer sheath, and the inner protection layer, the steel tape armoring layer, the bending-resistant and twisting-resistant layer and the outer sheath are arranged into a whole. According to the power cable, the anti-bending and anti-twisting layer is arranged outside the armor layer, and the supporting core is arranged in the center of the cable core, so that the power cable can resist twisting force when being extruded by force, deformation of the whole cable or the inner wire cores can be prevented, the anti-bending and anti-twisting performance of the power cable is improved, and the service life of the power cable is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a power cable which is resistant to bending and twisting. 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, in the air, etc. Power cable is a cable product used to transmit and distribute high-power electric energy in the trunk line of the power system, including power cables of various voltage levels and various insulations from 1-500KV and above. The basic structure of power cable consists of four parts: core, insulation layer, shielding layer and protective layer. It is 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 announcement number is CN209374138U, and the authorization announcement date is September 10, 2019. A high-cold-resistant and anti-twisting power cable includes a protective layer, the inner surface of the protective layer is fixedly connected to a thermal insulation layer, the inner surface of the thermal insulation layer is fixedly connected to a winding layer located inside the protective layer, the inner surface of the winding layer is fixedly connected to a main insulating layer located inside the protective layer, and the center of the main insulating layer is fixedly connected to a power cable core located inside the protective layer. The high-cold-resistant and anti-twisting power cable, through the setting of the outermost protective layer, the protective layer is made of polytetrafluoroethylene, and the protective layer made of polytetrafluoroethylene has the characteristics of high temperature resistance, high cold resistance, high pressure resistance, corrosion resistance, impact resistance, and friction resistance, which can reduce the degree of wear of the cable during use, and can withstand the adverse weather conditions in the region, ensuring that the cable loss during use is minimized, thereby improving the practicality of the power cable.

[0004] When existing power cables are extruded, the wire core inside the cable lacks self-protection and cannot resist certain twisting forces, which can easily lead to large deformation of the cable as a whole or the internal wire core, causing twisting, breakage and other phenomena, reducing the service life of the cable and failing to meet usage requirements. Utility Model Content

[0005] The purpose of the utility model is to provide a power cable that is resistant to bending and twisting, so as to solve the problem in the above-mentioned background technology that when the existing power cables are used and squeezed, the wire cores inside the cables lack self-protection and cannot resist some twisting forces, which easily leads to large deformation of the entire cable or the internal wire cores, causing twisting, breakage and the like, reducing the service life of the cable and failing to meet the use requirements.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a bending and twisting resistant power cable, comprising a cable core, the cable core comprising a wire core and a filling layer, five wire cores are arranged, and the five wire cores are arranged equidistantly in a circle, an intermediate support core is arranged between the five wire cores, and the intermediate support core is in contact with the wire core, the intermediate support core is arranged at the center of the cable core, a wrapping layer is arranged on the outside of the cable core, and the wrapping layer and the cable core are formed by extrusion, an inner protective layer is arranged on the outside of the wrapping layer, a steel belt armor layer is arranged on the outside of the inner protective layer, a bending and twisting resistant layer is arranged on the outside of the steel belt armor layer, an outer sheath is arranged on the outside of the bending and twisting resistant layer, and the inner protective layer, the steel belt armor layer, the bending and twisting resistant layer and the outer sheath are arranged as a whole.

[0007] Preferably, the wire core includes a conductor, an insulating layer and a shielding layer, and the conductor is formed by twisting a plurality of metal wires, the insulating layer is arranged outside the conductor, the shielding layer is arranged outside the insulating layer, and the conductor, the insulating layer and the shielding layer are formed by extrusion.

[0008] Preferably, the anti-bending and anti-twisting layer includes a polytetrafluoroethylene belt, a fiber woven mesh and a high-elastic rubber. The polytetrafluoroethylene belt is arranged on the outside of the fiber woven mesh, and the high-elastic rubber is arranged on the inside of the fiber woven mesh. The polytetrafluoroethylene belt, the fiber woven mesh and the high-elastic rubber are formed by extrusion.

[0009] Preferably, a polypropylene sleeve is provided outside the shielding layer, and the polypropylene sleeve and the shielding layer are formed by extrusion.

[0010] Preferably, the outer wall of the middle support core is provided with grooves, and there are five grooves, which are evenly spaced on the outer wall of the middle support core, and the grooves are arranged corresponding to the wire cores.

[0011] Preferably, the filling layer is arranged at the gap between the five wire cores and the middle supporting core, and the filling layer is made of rubber resin.

[0012] Preferably, the wrapping layer is made of cross-linked polyethylene, and the inner protective layer is made of silicone rubber.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model device is provided with an intermediate support core and a groove. The intermediate support core increases the anti-twisting ability of the power cable itself, so that the power cable will not be damaged by some sudden twisting force when in use. The groove facilitates the assembly of the wire core and the intermediate support core, and can limit the assembled wire core, thereby preventing the wire core from being dislocated when subjected to external force, and improving the overall stability of the power cable.

[0015] The utility model device is provided with an anti-bending and twisting resistant layer. The anti-bending and twisting resistant layer is composed of a multi-layer structure of polytetrafluoroethylene tape, fiber woven mesh and high-elastic rubber. The multi-layer structure enables the power cable to have a certain buffering effect, plays an anti-stretching role when subjected to force, prevents twisting and deformation, improves the mechanical properties of the power cable such as twisting resistance and tensile resistance, and improves the use effect of the power cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a cross-sectional view of the utility model;

[0018] Figure 3 For the utility model Figure 2 A partial enlarged view of area A;

[0019] Figure 4 This is a structural diagram of the intermediate support core of the utility model;

[0020] Figure 5 This is a structural diagram of the anti-bending and anti-twisting layer of the utility model.

[0021] In the figure: 1. Cable core; 2. Wire core; 3. Intermediate supporting core; 4. Wrapping layer; 5. Inner protective layer; 6. Steel belt armor layer; 7. Anti-bending and anti-twisting layer; 8. Outer sheath; 9. Conductor; 10. Filling layer; 11. Insulating layer; 12. Shielding layer; 13. Polypropylene sleeve; 14. Groove; 15. Polytetrafluoroethylene tape; 16. Fiber braided mesh; 17. High elastic rubber. DETAILED DESCRIPTION

[0022] 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.

[0023] See also Figure 1-5The utility model provides an embodiment: a bending and twisting resistant power cable, comprising a cable core 1, the cable core 1 comprising a wire core 2 and a filling layer 10, five wire cores 2 are arranged, and the five wire cores 2 are arranged equidistantly in a circle, an intermediate support core 3 is arranged between the five wire cores 2, and the intermediate support core 3 is in contact with the wire core 2, and the intermediate support core 3 is arranged at the center of the cable core 1, a wrapping layer 4 is arranged on the outside of the cable core 1, and the wrapping layer 4 and the cable core 1 are formed by extrusion, an inner protective layer 5 is arranged on the outside of the wrapping layer 4, a steel belt armor layer 6 is arranged on the outside of the inner protective layer 5, a bending and twisting resistant layer 7 is arranged on the outside of the steel belt armor layer 6, an outer sheath 8 is arranged on the outside of the bending and twisting resistant layer 7, and the inner protective layer 5, the steel belt armor layer 6, the bending and twisting resistant layer 7 and the outer sheath 8 are arranged as a whole.

[0024] See also Figure 1 , Figure 2 and Figure 3 The core 2 includes a conductor 9, an insulating layer 11 and a shielding layer 12, and the conductor 9 is formed by twisting a plurality of metal wires, the insulating layer 11 is arranged outside the conductor 9, the shielding layer 12 is arranged outside the insulating layer 11, and the conductor 9, the insulating layer 11 and the shielding layer 12 are formed by extrusion. By sequentially arranging the insulating layer 11 and the shielding layer 12 outside the conductor 9, an insulating shielding effect is formed outside the conductor 9 to separate the multiple groups of cores 2.

[0025] See also Figure 1 , Figure 2 and Figure 5 The anti-bending and anti-twisting layer 7 includes a polytetrafluoroethylene tape 15, a fiber braided mesh 16 and a high-elastic rubber 17. The polytetrafluoroethylene tape 15 is arranged on the outside of the fiber braided mesh 16, and the high-elastic rubber 17 is arranged on the inside of the fiber braided mesh 16. The polytetrafluoroethylene tape 15, the fiber braided mesh 16 and the high-elastic rubber 17 are extruded to form a multi-layer structure, thereby improving the mechanical properties of the cable such as the torsion resistance and tensile resistance, and improving the use effect of the power cable.

[0026] See also Figure 2 and Figure 3 A polypropylene sleeve 13 is provided on the outside of the shielding layer 12, and the polypropylene sleeve 13 and the shielding layer 12 are formed by extrusion. Polypropylene has high crystallinity and regular structure. Polypropylene has excellent resistance to bending fatigue. The wire core 2 can be bent many times at room temperature without damage, thereby improving the overall bending resistance effect.

[0027] See also Figure 1 , Figure 3 and Figure 4A groove 14 is arranged on the outer wall of the middle supporting core 3. There are five grooves 14, and the five grooves 14 are arranged equidistantly on the outer wall of the middle supporting core 3. The grooves 14 are arranged corresponding to the core 2. The middle supporting core 3 increases the anti-twisting ability of the power cable itself, so that the power cable will not be damaged by some sudden twisting force when in use. The grooves 14 facilitate the assembly of the core 2 and the middle supporting core 3, and can limit the assembled core 2, thereby improving the overall stability of the power cable.

[0028] See also Figure 1 and Figure 2 The filling layer 10 is arranged at the gap between the five wire cores 2 and the middle supporting core 3, and the filling layer 10 is made of rubber resin.

[0029] See also Figure 1 The wrapping layer 4 is made of cross-linked polyethylene, and the inner protective layer 5 is made of silicone rubber.

[0030] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0031] 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 power cable that is resistant to bending and twisting, comprising a cable core (1), characterized in that: The cable core (1) comprises a wire core (2) and a filling layer (10), wherein five wire cores (2) are provided, and the five wire cores (2) are arranged equidistantly in a circular shape, an intermediate support core (3) is arranged between the five wire cores (2), and the intermediate support core (3) is in contact with the wire core (2), and the intermediate support core (3) is arranged at the center of the cable core (1), a wrapping layer (4) is arranged outside the cable core (1), and the wrapping layer (4) and the cable core (1) are formed by extrusion, an inner protective layer (5) is arranged outside the wrapping layer (4), a steel belt armor layer (6) is arranged outside the inner protective layer (5), a bending and twisting resistant layer (7) is arranged outside the steel belt armor layer (6), an outer sheath (8) is arranged outside the bending and twisting resistant layer (7), and the inner protective layer (5), the steel belt armor layer (6), the bending and twisting resistant layer (7) and the outer sheath (8) are arranged as a whole.

2. The bending and twisting resistant power cable according to claim 1, characterized in that: The wire core (2) comprises a conductor (9), an insulating layer (11) and a shielding layer (12), wherein the conductor (9) is formed by twisting a plurality of metal wires, the insulating layer (11) is arranged outside the conductor (9), the shielding layer (12) is arranged outside the insulating layer (11), and the conductor (9), the insulating layer (11) and the shielding layer (12) are formed by extrusion.

3. The bending and twisting resistant power cable according to claim 1, characterized in that: The anti-bending and anti-twisting layer (7) comprises a polytetrafluoroethylene tape (15), a fiber braided mesh (16) and a high-elastic rubber (17); the polytetrafluoroethylene tape (15) is arranged on the outside of the fiber braided mesh (16), the high-elastic rubber (17) is arranged on the inside of the fiber braided mesh (16), and the polytetrafluoroethylene tape (15), the fiber braided mesh (16) and the high-elastic rubber (17) are formed by extrusion.

4. The bending and twisting resistant power cable according to claim 2, characterized in that: A polypropylene sleeve (13) is provided outside the shielding layer (12), and the polypropylene sleeve (13) and the shielding layer (12) are formed by extrusion.

5. The bending and twisting resistant power cable according to claim 1, characterized in that: The outer wall of the middle support core (3) is provided with grooves (14), five grooves (14) are provided, and the five grooves (14) are arranged at equal intervals on the outer wall of the middle support core (3), and the grooves (14) are arranged corresponding to the wire cores (2).

6. The bending and twisting resistant power cable according to claim 1, characterized in that: The filling layer (10) is arranged at the gap between the five wire cores (2) and the middle support core (3), and the filling layer (10) is made of rubber resin.

7. The bending and twisting resistant power cable according to claim 1, characterized in that: The wrapping layer (4) is made of cross-linked polyethylene, and the inner protective layer (5) is made of silicone rubber.

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