Composite insulation structure power cable

Abstract

A composite insulation structure power cable disclosed by the present invention comprises a cable core, a lining support, an inner wrapping layer and an outer wrapping sheath, the center of the cable core is provided with the lining support, the edge of the lining support is provided with a plurality of uniformly distributed positioning grooves, separation ribs are arranged among the positioning grooves, the edge of the separation ribs is provided with reinforcing blocks in plug-in connection, and the inner wrapping layer is provided with an outer wrapping layer. The lower surface of the reinforcing block is provided with an inserting groove, the inserting groove is connected with the top of the separation rib in an inserting mode, the center of the lining support is provided with a buffer groove, the cable cores are embedded in the positioning grooves, the reinforcing block is located between every two adjacent cable cores, the inner wrapping layer wraps the surface of the reinforcing block, and the surface of the inner wrapping layer is provided with an outer wrapping sheath. The main insulating layer and the auxiliary insulating layer are arranged on the surface of the cable core, the insulating capacity of the cable core is effectively improved, the lining support is arranged in the cable core, the cable cores are conveniently isolated from one another, the cable cores are pressurized and fixed in cooperation with the reinforcing blocks, and the overall stability and safety of the cable are improved.

Description

Technical Field

[0001] The invention relates to the technical field of power cables, in particular to a power cable with a composite insulation structure. Background Art

[0002] Electricity is an energy source that uses electrical energy as a driving force. The large-scale power system that emerged in the 20th century is one of the most important achievements in the history of human engineering science. It is a power production and consumption system composed of power generation, transmission, transformation, distribution and power consumption. Cables play an important role in the process of power transmission.

[0003] Power cables are cables 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. In power lines, the proportion of power cables is gradually increasing. Power cables can be divided into medium and low voltage power cables (35 kV and below), high voltage cables (above 110 kV), extra high voltage cables (275-800 kV), and ultra-high voltage cables (1000 kV and above) according to voltage levels.

[0004] At present, the existing multi-core power cables usually directly wrap the outer sheath on the surface of the cable core, resulting in weak anti-extrusion ability of the cable, which easily causes the cable cores to be squeezed and damaged. Some cables will add internal brackets between the cable cores. Although they can isolate the cable cores, they cannot play a supporting role for some cables with a large pre-buried depth, causing the cable cores to still be squeezed against each other, affecting the stability and safety of the cable. For this reason, a composite insulation structure power cable is proposed. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the present invention provides a composite insulated power cable, which solves the problem that the cable cores are squeezed against each other when the cable is subjected to greater pressure due to the lack of an effective supporting structure in the prior art cables. A main insulating layer and an auxiliary insulating layer are provided on the surface of the cable core to effectively improve the insulation capacity of the cable core. An inner lining bracket is provided inside the cable core to facilitate isolation of the cable cores from each other, and the cable core is pressurized and fixed with a reinforcement block to improve the overall stability and safety of the cable.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a composite insulation structure power cable, comprising a cable core, an inner lining bracket, an inner sheath and an outer sheath, an inner lining bracket is provided at the center of the cable core, a plurality of evenly distributed positioning grooves are opened at the edge of the inner lining bracket, the positioning grooves are provided with dividing ribs, a plug-in connected reinforcement block is provided at the edge of the dividing rib, a plug-in groove is provided on the lower surface of the reinforcement block, the plug-in groove is plug-connected to the top of the dividing rib, a buffer groove is provided at the center of the inner lining bracket, the cable core is embedded in the positioning groove, the reinforcement block is located between two adjacent cable cores, the inner sheath is wrapped on the surface of the reinforcement block, and the surface of the inner sheath is provided with an outer sheath.

[0009] As a further preferred embodiment of the present invention, the cable core comprises a copper conductor, a main insulating layer and an auxiliary insulating layer, wherein the main insulating layer is wrapped on the surface of the copper conductor, and the main insulating layer is wrapped with the auxiliary insulating layer.

[0010] As a further preferred embodiment of the present invention, the copper conductor is made of a plurality of copper monofilaments twisted and woven after non-compression annealing, the main insulating layer is made of polyethylene material, and the auxiliary insulating layer is made of cross-linked polyethylene material.

[0011] As a further preferred embodiment of the present invention, arc-shaped extrusion grooves are respectively provided on both sides of the reinforcement block, and the extrusion grooves are connected to the surface of the cable core.

[0012] As a further preferred embodiment of the present invention, the edges of the separation ribs are distributed in an isosceles trapezoidal shape, the inner wall of the plug-in slot is distributed in a V-shape, and the buffer slot is distributed in an "*" shape.

[0013] As a further preferred embodiment of the present invention, the inner sheath is wrapped around the surface of the lining bracket and the cable core in a grid shape, and the inner sheath is made of braided metal wires.

[0014] As a further preferred embodiment of the present invention, the outer sheath is composed of a glass cloth tape and a flame retardant rubber layer, the glass cloth tape is spirally wrapped around the surface of the cable core and the center frame, and the flame retardant rubber layer is wrapped around the surface of the glass cloth tape.

[0015] As a further preferred embodiment of the present invention, a flame retardant cavity is provided inside the flame retardant rubber layer, and the flame retardant cavity is filled with a flame retardant.

[0016] (III) Beneficial effects

[0017] The present invention provides a composite insulation structure power cable, which has the following beneficial effects:

[0018] 1. The present invention provides a main insulating layer and an auxiliary insulating layer on the surface of the cable core, thereby effectively improving the insulation capacity of the cable core and greatly extending the service life and safety of the cable core. An inner liner bracket is provided inside the cable core to facilitate isolation of the cable cores from each other, and the cable core is pressurized and fixed with a reinforcement block to improve the overall stability and safety of the cable.

[0019] 2. The present invention provides a buffer groove in the center of the lining bracket to facilitate buffering the deformation of the cable core in an environment with large temperature changes, avoid damage to the cable core and reduce the generation of static electricity. At the same time, the buffer groove is completely closed in an environment with large extrusion pressure, thereby improving the structural strength of the lining bracket and enhancing the stability of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the composite insulation structure power cable of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the end face of the composite insulation structure power cable of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the side surface of the composite insulation structure power cable of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the liner support of the present invention;

[0024] Figure 5 It is a schematic structural diagram of the reinforcement block of the present invention.

[0025] In the figure: cable core-1, lining bracket-2, inner sheath-3, outer sheath-4, positioning groove-5, dividing rib-6, reinforcement block-7, plug-in groove-8, buffer groove-9, copper conductor-10, main insulation layer-11, auxiliary insulation layer-12, extrusion groove-13, glass cloth tape-14, flame retardant rubber layer-15, flame retardant cavity-16, flame retardant-17. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-5The embodiment of the present invention provides a technical solution: a composite insulation structure power cable, including a cable core 1, an inner liner bracket 2, an inner sheath 3 and an outer sheath 4, the inner liner bracket 2 is provided at the center of the cable core 1, a plurality of evenly distributed positioning grooves 5 are provided at the edge of the inner liner bracket 2, a separation rib 6 is provided between the positioning grooves 5, a reinforcement block 7 connected by plugging is provided at the edge of the separation rib 6, a plug-in groove 8 is provided on the lower surface of the reinforcement block 7, the plug-in groove 8 is plug-connected to the top of the separation rib 6, a buffer groove 9 is provided at the center of the inner liner bracket 2, the cable core 1 is embedded in the positioning groove 5, and the reinforcement block 7 is located at Between two adjacent cable cores 1, the inner sheath 3 is wrapped on the surface of the reinforcement block 7, and the surface of the inner sheath 3 is provided with an outer sheath 4. By providing an inner lining bracket 2 inside the cable core 1, the cable cores 1 are conveniently isolated from each other, and the cable cores 1 are pressurized and fixed in cooperation with the reinforcement block 7 to improve the overall stability and safety of the cable. By providing a buffer groove 9 in the center of the inner lining bracket 2, the deformation of the cable core 1 in an environment with large temperature changes can be buffered to avoid damage to the cable core 1 and reduce the generation of static electricity. At the same time, the buffer groove 9 is completely closed in an environment with large extrusion pressure, which improves the structural strength of the inner lining bracket 2 and enhances the stability of the cable.

[0028] As a further improvement, the cable core 1 includes a copper conductor 10, a main insulating layer 11 and an auxiliary insulating layer 12, wherein the main insulating layer 11 is wrapped on the surface of the copper conductor 10, and the main insulating layer 11 is wrapped with the auxiliary insulating layer 12. By means of a composite insulating structure in which the main insulating layer 11 and the auxiliary insulating layer 12 are respectively wrapped on the surface of the copper conductor 10, the insulation capacity of the cable core 1 can be effectively improved, and the safety of the cable can be avoided from being affected by the reduction of insulation performance during long-term use, thereby effectively improving the insulation capacity of the cable core.

[0029] As a further improvement, the copper conductor 10 is formed by twisting and weaving multiple copper monofilaments after non-compressed annealing, the main insulating layer 11 is made of polyethylene, and the auxiliary insulating layer 12 is made of cross-linked polyethylene. The copper conductor 10 is made of twisted and weaved after non-compressed annealing, and its performance is good, which can ensure the conductivity of the power cable. The auxiliary insulating layer 12 is made of cross-linked polyethylene, and its heat resistance is better than that of the main insulating layer 11 made of polyethylene, thereby improving the heat resistance of the cable core 1.

[0030] As a further improvement, arc-shaped extrusion grooves 13 are respectively provided on both sides of the reinforcement block 7, and the extrusion grooves 13 are connected to the surface of the cable core 1. By providing extrusion grooves 13 on both sides of the reinforcement block 7, the contact area between the reinforcement block 7 and the surface of the cable core 1 is increased, which facilitates the extrusion of the reinforcement block 7 when the inner sheath 3 is wrapped around the surface of the liner bracket 2, thereby improving the stability of the connection between the cable core 1 and the liner bracket 2, and at the same time avoiding damage to the insulating layer on the surface of the cable core 1, thereby improving the safety of the cable core 1.

[0031] As a further improvement, the edges of the dividing rib 6 are distributed in an isosceles trapezoidal shape, the inner wall of the plug-in slot 8 is distributed in a V shape, and the buffer slot 9 is distributed in an "*" shape. By providing a V-shaped plug-in slot 8 on the inner wall of the reinforcement block 7, the connection stability between the reinforcement block 7 and the dividing rib 6 is improved. By providing a "*"-shaped buffer slot 9 at the center of the lining bracket 2, it is convenient to buffer the deformation of the cable core 1 caused by large temperature changes, thereby avoiding the extrusion and rupture of the surface insulation layer of the cable core 1. At the same time, when subjected to large extrusion, the buffer slot 9 can be completely closed and provide good support for the cable, thereby improving the compressive resistance of the cable.

[0032] As a further improvement, the inner sheath 3 is wrapped in a grid shape on the surface of the lining bracket 2 and the cable core 1. The inner sheath 3 is made of woven metal wires. By weaving the metal wires into a grid-shaped inner sheath 3, the anti-interference ability of the cable is improved and the stability of the cable use is enhanced.

[0033] Further improved, the outer sheath 4 is composed of a glass cloth tape 14 and a flame retardant rubber layer 15, the glass cloth tape 14 is spirally wrapped around the surface of the cable core 1 and the center frame, and the flame retardant rubber layer 15 is wrapped around the surface of the glass cloth tape 14. By using the glass cloth tape 14 to wrap the cable core 1 and the center frame, the overall stability of the cable is improved. At the same time, by utilizing the flame retardancy of the glass cloth tape, the cable core 1 can be effectively protected to avoid damage to the cable core 1 when the outer layer of the cable is burned. By wrapping the flame retardant rubber layer 15 on the surface of the glass cloth tape 14, it is convenient to flame retardantly protect the cable and improve the safety of cable use.

[0034] Specifically, a flame retardant cavity 16 is provided inside the flame retardant rubber layer 15, and the flame retardant cavity 16 is filled with a flame retardant 17. By providing a flame retardant cavity 16 with a flame retardant 17 inside the flame retardant rubber layer 15, the fire retardant performance of the cable is further improved, and the safety of cable use is improved.

[0035] During the use of the present invention, when the cable core 1 is deformed by temperature changes, the cable core 1 is deformed and squeezes the liner bracket 2, and the liner bracket 2 expands and contracts along the buffer groove 9, thereby buffering the deformation of the cable core 1 to avoid the insulation layer on the surface of the cable core 1 being squeezed and cracked. When the cable is buried, the cable surface is squeezed and transmitted to the liner bracket 2 through the reinforcement block 7. The buffer groove 9 is completely closed due to excessive squeezing force, thereby providing better support capacity for the cable, enhancing the compression resistance of the cable, and improving the safety of cable use. In addition, by providing a main insulating layer 11 and an auxiliary insulating layer 12 on the surface of the copper conductor 10, the copper conductor 10 is protected by insulating layers of different materials, thereby extending the service life and safety of the cable core 1. .

[0036] Problems solved by the present invention: Existing multi-core power cables usually directly wrap an outer sheath on the surface of the cable core, resulting in weak anti-extrusion ability of the cable, which easily causes the cable cores to be squeezed and damaged. Some cables will add an inner bracket between the cable cores. Although it can isolate the cable core, it cannot play a supporting role for some cables with a large pre-buried depth, resulting in the cable cores still being squeezed against each other, affecting the stability and safety of the cable. The present invention provides a main insulating layer 11 and an auxiliary insulating layer 12 on the surface of the cable core 1, effectively improving the insulation ability of the cable core 1, greatly extending the service life and safety of the cable core 1, providing an inner lining bracket 2 inside the cable core 1, facilitating isolation of the cable cores 1, and pressurizing and fixing the cable core 1 with the reinforcement block 7 to improve the overall stability and safety of the cable, and providing a buffer groove 9 in the center of the inner lining bracket 2, facilitating buffering of the deformation of the cable core 1 in an environment with large temperature changes, avoiding damage to the cable core 1 and reducing the generation of static electricity, and at the same time, the buffer groove 9 is completely closed in an environment with large extrusion pressure, improving the structural strength of the inner lining bracket 2, and enhancing the stability of the cable.

[0037] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0039] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A composite insulation structure power cable, comprising a cable core (1), an inner lining support (2), an inner sheath (3) and an outer sheath (4), characterized in that: An inner lining bracket (2) is provided at the center of the cable core (1), a plurality of evenly distributed positioning grooves (5) are provided at the edge of the inner lining bracket (2), a separation rib (6) is provided between the positioning grooves (5), a plug-in connected reinforcement block (7) is provided at the edge of the separation rib (6), a plug-in groove (8) is provided on the lower surface of the reinforcement block (7), the plug-in groove (8) is plug-in connected to the top of the separation rib (6), a buffer groove (9) is provided at the center of the inner lining bracket (2), the cable core (1) is embedded in the positioning groove (5), the reinforcement block (7) is located between two adjacent cable cores (1), the inner sheath (3) is wrapped around the surface of the reinforcement block (7), and the surface of the inner sheath (3) is provided with an outer sheath (4).

2. A composite insulation structure power cable according to claim 1, characterized in that: The cable core (1) comprises a copper conductor (10), a main insulating layer (11) and an auxiliary insulating layer (12); the main insulating layer (11) is wrapped around the surface of the copper conductor (10), and the main insulating layer (11) is wrapped with the auxiliary insulating layer (12).

3. A composite insulation structure power cable according to claim 2, characterized in that: The copper conductor (10) is made of a plurality of copper monofilaments twisted and braided after non-compression annealing, the main insulating layer (11) is made of polyethylene material, and the auxiliary insulating layer (12) is made of cross-linked polyethylene material.

4. A composite insulation structure power cable according to claim 1, characterized in that: Arc-shaped extrusion grooves (13) are respectively provided on both sides of the reinforcement block (7), and the extrusion grooves (13) are connected to the surface of the cable core (1).

5. The composite insulation structure power cable according to claim 1, characterized in that: The edges of the separation ribs (6) are distributed in an isosceles trapezoidal shape, the inner wall of the plug-in slot (8) is distributed in a V-shape, and the buffer slot (9) is distributed in an "*" shape.

6. A composite insulation structure power cable according to claim 1, characterized in that: The inner cladding (3) is wrapped in a grid shape on the surface of the lining support (2) and the cable core (1), and the inner cladding (3) is made of braided metal wires.

7. A composite insulation structure power cable according to claim 1, characterized in that: The outer sheath (4) is composed of a glass cloth tape (14) and a flame retardant rubber layer (15); the glass cloth tape (14) is spirally wrapped around the surface of the cable core (1) and the center frame; and the flame retardant rubber layer (15) is wrapped around the surface of the glass cloth tape (14).

8. A composite insulation structure power cable according to claim 7, characterized in that: A flame retardant cavity (16) is provided inside the flame retardant rubber layer (15), and the interior of the flame retardant cavity (16) is filled with a flame retardant (17).

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