Low-voltage cable with reinforcing structure

Abstract

The utility model relates to the technical field of low-voltage cables, in particular to a low-voltage cable with a reinforcing structure, which comprises a plurality of strands of conductors, insulating layers are wrapped outside the plurality of strands of conductors, the reinforcing structure comprises a plurality of reinforcing bodies made of polyurethane materials, a plurality of threading holes are arranged inside the reinforcing bodies, and the plurality of threading holes are communicated with the insulating layers. The multiple strands of conductors penetrate through the corresponding threading holes of all the reinforcing bodies, a filling material layer is arranged between the insulating layer and the inner hole wall of the corresponding threading hole, the multiple reinforcing bodies are wrapped with a rubber sheath layer, and a gap is reserved between every two adjacent reinforcing bodies. And a rubber sheath layer is also arranged outside the multi-strand conductor at the spacing part. According to the utility model, the requirements of light self weight and high compressive strength can be met at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage cables, in particular to a low-voltage cable with a reinforced structure. Background Art

[0002] According to the provisions of "GB / T2900.50-2008 Electrical Terminology General Terms for Power Generation, Transmission and Distribution", voltages below 1KV (including 1KV) are defined as low voltage, and 1KV-330KV are called high voltage. Therefore, cables with a rated voltage of 1KV and below are called low-voltage cables, and cables with a rated voltage of 1KV-330KV are called high-voltage cables.

[0003] Among them, the high-voltage cable includes a twisted copper conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, a metal shielding layer, a filling material, a wrapping tape, an inner sheath, a steel belt armor layer and a polyvinyl chloride outer sheath. Generally, compared with the high-voltage cable, the low-voltage cable lacks at least a conductor shielding layer, an insulating shielding layer and a metal shielding layer in structure. The purpose of the conductor shielding layer is: since the conductor is made of multiple hard wires twisted together, there are gaps on the surface, which will lead to uneven electric field and easy local discharge, so it is filled with conductive non-metallic soft materials to ensure perfect fit with the insulating layer to uniform the electric field and improve the life of the cable; the purpose of the insulating shielding layer is: since there are gaps in the direct combination of the insulating layer and the outer sheath, a conductive semiconductor layer is added outside the insulating layer to uniform the electric field and prevent local discharge; the purpose of the metal shielding layer is: in order to ensure that the semiconductor layer can be reliably grounded, a metal shielding layer is wrapped outside, and the metal shielding layer is directly grounded when working normally to discharge the distributed capacitance current between the cable and other conductors, and it can also shield some electromagnetic interference to prevent interference with other equipment. This is mainly due to the differences in voltage levels and insulation capabilities. The low-voltage 0.4KV electric field capability is much weaker than 10KV, such as air breakdown or insulation breakdown.

[0004] In fact, common low-voltage cables do not have a steel belt armor layer inside. Therefore, the mechanical strength of conventional low-voltage cables is low. In some temporary power usage scenarios, the low-voltage cable laying conditions are not ideal, and the low-voltage cables are easily squeezed by external forces, such as mechanical equipment or other materials, which makes the low-voltage cables easily damaged by external forces. If a low-voltage cable with a steel belt armor layer is used, the steel belt armor layer can effectively enhance the compression resistance of the low-voltage cable, but due to its internal steel belt structure, it is too heavy, and there will be many inconveniences during use, such as the process of laying or transferring the cable will be more troublesome. Therefore, there is an urgent need for a low-voltage cable with a lighter weight and higher compression resistance. Utility Model Content

[0005] The utility model aims to provide a low-voltage cable with a reinforced structure to solve the problem that the low-voltage cable cannot simultaneously meet the requirements of light weight and high pressure resistance.

[0006] The utility model is realized by the following technical solutions:

[0007] A low-voltage cable with a reinforcement structure comprises a plurality of conductors, each of which is wrapped with an insulating layer. The reinforcement structure comprises a plurality of reinforcement bodies made of polyurethane, each of which is provided with a plurality of threading holes. Each of the plurality of conductors passes through the threading holes corresponding to all the reinforcement bodies. A filling material layer is provided between the insulating layer and the inner wall of the corresponding threading hole. A rubber sheath layer is provided outside the plurality of reinforcement bodies, a spacing is left between two adjacent reinforcement bodies, and a rubber sheath layer is also provided outside the plurality of conductors located at the spacing.

[0008] Furthermore, rope holes are opened inside the plurality of reinforcement bodies, tensile ropes are passed through the rope holes, and the filling material layer is arranged between the tensile ropes and the inner wall of the rope holes.

[0009] Furthermore, a plurality of deformation buffer holes are provided inside the plurality of reinforcement bodies.

[0010] Furthermore, an elastic insulator is provided in the interval between two adjacent reinforcement bodies, a plurality of wire grooves are circumferentially provided on the outer wall of the insulator, the plurality of conductors are located in the corresponding wire grooves, and a through hole is provided inside the elastic insulator for the tensile rope to pass through.

[0011] Furthermore, the outer wall of each reinforcing body is provided with a plurality of protruding structures, and the plurality of protruding structures extend into the interior of the rubber sheath layer.

[0012] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0013] In the utility model, polyurethane material is used as the reinforcement structure inside the low-voltage cable, so that each conductor is located in the threading hole corresponding to the reinforcement body. When the cable is subjected to external force, since the polyurethane material has high elasticity and toughness, the polyurethane material can buffer the external force during the process of being squeezed and deformed, so that multiple conductors can be better protected. Compared with the hollow reinforcement body, the size of each threading hole of the present solution is smaller, so that the deformation of the threading hole when squeezed by external force is also relatively small. At the same time, polyurethane as a reinforcement body will not excessively increase the weight of the cable itself, so that the cable can meet the requirements of light weight and high compressive strength at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model.

[0015] In the attached picture:

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

[0017] Figure 2 It is a partial structural sectional view of the utility model.

[0018] Marks and corresponding parts names in the attached drawings:

[0019] 1. Conductor; 2. Insulation layer; 3. Reinforcement body; 4. Threading hole; 5. Filling material layer; 6. Rubber sheath layer; 7. Rope hole; 8. Tensile rope; 9. Deformation buffer hole; 10. Elastic insulator; 11. Wire trough; 12. Raised structure. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in combination with the embodiments and drawings. The schematic implementation mode and description of the utility model are only used to explain the utility model and are not intended to limit the utility model. It should be noted that the utility model is already in the actual development and use stage.

[0021] Example 1

[0022] A low voltage cable with a reinforced structure, referring to Figure 1 , including a multi-strand conductor 1, each of which is wrapped with an insulating layer 2, a reinforcement structure including a plurality of reinforcement bodies 3 made of polyurethane, a plurality of threading holes 4 are provided inside the reinforcement body 3, and the multi-strand conductor 1 passes through the threading holes 4 corresponding to all reinforcement bodies 3, a filling material layer 5 is provided between the insulating layer 2 and the inner hole wall of the corresponding threading hole 4, a rubber sheath layer 6 is provided outside the plurality of reinforcement bodies 3, a spacing is left between two adjacent reinforcement bodies 3, and a rubber sheath layer 6 is also provided outside the multi-strand conductor 1 located at the spacing position. The conductor 1 is made of copper core wire or aluminum core wire, and the conductor 1 can be made of 2, 3, 4 or 5 strands.

[0023] In this solution, polyurethane material is used as the reinforcement structure inside the low-voltage cable, so that each conductor 1 is located in the threading hole 4 corresponding to the reinforcement body 3. When the cable is subjected to external force, since the polyurethane material has high elasticity and toughness, the polyurethane material can buffer the external force during the process of being squeezed and deformed, so that multiple strands of conductors 1 can be better protected. Compared with the hollow reinforcement body 3, the size of each threading hole 4 in this solution is smaller, so that the deformation of the threading hole 4 when being squeezed by external force is also relatively small. At the same time, polyurethane as a reinforcement body 3 will not excessively increase the weight of the cable itself, and the cable can simultaneously meet the requirements of light weight and high compressive strength. In addition, there is a spacing between two adjacent reinforcement bodies 3, so it does not affect the proper bending of the cable, and the rubber sheath layer 6 at the position where the spacing is located can be bent.

[0024] Example 2

[0025] Based on Example 1, in this example, reference Figure 1 A rope hole 7 is also provided inside the multiple reinforcement bodies 3, and a tensile rope 8 is passed through the rope hole 7, and a filling material layer 5 is provided between the tensile rope 8 and the inner hole wall of the rope hole 7. The tensile rope 8 can be closely connected with the multiple reinforcement bodies 3 through the filling material layer 5, and then the tensile resistance of the entire cable can be improved through the tensile rope 8.

[0026] Example 3

[0027] Based on Example 2, in this example, refer to Figure 1 A plurality of deformation buffer holes 9 are provided inside the plurality of reinforcement bodies 3, and the plurality of deformation buffer holes 9 are used to provide deformation space for the reinforcement bodies 3 after being squeezed by external force, so as to facilitate buffering the external force squeezing impact.

[0028] Example 4

[0029] Based on Example 3, in this example, refer to Figure 1 2, elastic insulators 10 are arranged in the interval between two adjacent reinforcement bodies 3, multiple wire grooves 11 are opened in the outer wall of the insulator along the circumferential direction, and the multiple conductors 1 are all located in the corresponding wire grooves 11, and a through hole for the tensile rope 8 to pass through is opened inside the elastic insulator 10. The elastic insulator 10 is located between the multiple conductors 1, and the elastic insulator 10 can be made of elastic rubber material. The multiple conductors 1 located in the interval can be supported by the elastic insulator 10, and the elastic insulator 10 is also wrapped with a rubber sheath layer 6, which can integrate the conductor 1, multiple reinforcement bodies 3 and the elastic insulator 10 into a whole.

[0030] Example 5

[0031] Based on Example 4, in this example, reference Figure 1 , Figure 2 , each reinforcement body 3 is provided with a plurality of protrusion structures 12 on its outer wall, and the plurality of protrusion structures 12 extend into the rubber sheath layer 6. After the rubber sheath layer 6 is coated and cured, the plurality of protrusion structures 12 are conducive to making the plurality of reinforcement bodies 3 more stably fixed inside the rubber sheath layer 6.

[0032] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A low-voltage cable with a reinforced structure, comprising a plurality of conductors (1), each of which is wrapped with an insulating layer (2), characterized in that: The reinforcement structure comprises a plurality of reinforcement bodies (3) made of polyurethane material, a plurality of threading holes (4) are provided inside the reinforcement bodies (3), the plurality of conductors (1) are all passed through the threading holes (4) corresponding to all the reinforcement bodies (3), a filling material layer (5) is provided between the insulating layer (2) and the inner hole walls of the corresponding threading holes (4), a rubber sheath layer (6) is provided outside the plurality of reinforcement bodies (3), a spacing is left between two adjacent reinforcement bodies (3), and a rubber sheath layer (6) is also provided outside the plurality of conductors (1) located at the spacing.

2. A low voltage cable with a reinforced structure according to claim 1, characterized in that: A plurality of the reinforcing bodies (3) are also provided with rope holes (7), and a tensile rope (8) is passed through the rope holes (7). The filling material layer (5) is provided between the tensile rope (8) and the inner wall of the rope hole (7).

3. A low voltage cable with a reinforced structure according to claim 2, characterized in that: A plurality of deformation buffer holes (9) are provided inside the plurality of reinforcement bodies (3).

4. A low voltage cable with a reinforced structure according to claim 3, characterized in that: An elastic insulator (10) is provided in the interval between two adjacent reinforcement bodies (3), a plurality of wire grooves (11) are provided on the outer wall of the insulator in the circumferential direction, the plurality of conductors (1) are located in the corresponding wire grooves (11), and a through hole is provided inside the elastic insulator (10) for the tensile rope (8) to pass through.

5. A low voltage cable with a reinforced structure according to claim 4, characterized in that: The outer wall of each reinforcement body (3) is provided with a plurality of protruding structures (12), and the plurality of protruding structures (12) extend into the interior of the rubber sheath layer (6).

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