Aluminum alloy conductor cross-linked polyethylene insulated power cable

Abstract

The invention relates to the technical field of aluminum alloy cables, and provides an aluminum alloy conductor crosslinked polyethylene insulated power cable which comprises stretching rubber sleeves, stretching steel cores, supporting pieces, steel core communicating mechanisms and steel core fixing mechanisms, the multiple stretching rubber sleeves are arranged between an insulating layer and filler in a circumferential mode, the stretching rubber sleeves are arranged to be in an arc shape, and the supporting pieces are arranged on the stretching rubber sleeves. Each stretching rubber sleeve is internally provided with a plurality of stretching steel cores, each stretching rubber sleeve is internally and fixedly provided with a plurality of supporting pieces, the stretching steel cores penetrate through the supporting pieces, the steel core communicating mechanisms are arranged between the insulating layer and the filler, and the steel core communicating mechanisms are arranged at the two ends, in the axial direction of the cable, of the stretching rubber sleeves; the steel core communicating mechanism is used for communicating the stretching steel cores in the stretching rubber sleeves which are oppositely arranged, the steel core fixing mechanism is used for fixing the stretching steel cores, and through the technical scheme, the problem that the bending angle of the aluminum alloy cable is difficult to limit and protect in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy cables, and in particular to an aluminum alloy conductor cross-linked polyethylene insulated power cable. Background Art

[0002] Power cables with aluminum alloy conductors use aluminum alloy as the conductor to replace cables made of pure copper and pure aluminum. The conductivity of aluminum alloy cables is lower than that of copper cables, but higher than that of aluminum cables. In order to increase the conductivity, the cross-sectional area of ​​aluminum alloy conductors is usually increased to about 1.5 times that of copper cables. At the same time, the cost of aluminum alloy conductors is lower, and their tensile strength and creep properties are stronger than those of pure aluminum cables, so aluminum alloy cables have a large market.

[0003] Aluminum alloy cables have a low density and are suitable for use on long-distance overhead lines. However, aluminum alloy cables are prone to fatigue due to repeated bending and need to avoid repeated bending. At the same time, small radius bending needs to be avoided. Usually, a steel core may be added to the center of the aluminum alloy cable when twisting it to increase the tensile strength. However, the steel core in the center can hardly prevent the aluminum alloy cable from being bent in a small radius, which makes it possible for the aluminum alloy cable to be damaged in scenarios where cables are frequently bent, such as new energy vehicle wiring harnesses and medium and low voltage power distribution. Summary of the Invention

[0004] The present invention provides an aluminum alloy conductor cross-linked polyethylene insulated power cable, which is used to solve the problem in the prior art that it is difficult to limit and protect the bending angle of the aluminum alloy cable.

[0005] The technical solutions of the present invention are as follows: An aluminum alloy conductor cross-linked polyethylene insulated power cable, comprising an aluminum alloy conductor, a filler and an insulating layer, wherein the filler is arranged between a plurality of the aluminum alloy conductors, and the insulating layer is sleeved on the outside of the aluminum alloy conductors and the filler. The cable further comprises a stretching rubber sleeve, a stretching steel core, a support, a steel core connecting mechanism and a steel core fixing mechanism. A plurality of stretching rubber sleeves are provided, and the plurality of stretching rubber sleeves are circumferentially arranged between the insulating layer and the filler. The stretching rubber sleeve is arranged in an arc shape and is hollow inside. A plurality of stretching steel cores are provided, and each stretching rubber sleeve is provided with a plurality of the stretching steel cores. , there are multiple support members, each of the stretching rubber sleeves is fixed with multiple support members, the stretching steel core passes through the support members, there are multiple steel core connecting mechanisms, the steel core connecting mechanisms are arranged between the insulating layer and the filler, the stretching rubber sleeve is provided with the steel core connecting mechanisms at both ends along the axial direction of the cable, the steel core connecting mechanisms are used to connect the stretching steel cores in the oppositely arranged stretching rubber sleeves, there are multiple steel core fixing mechanisms, multiple steel core fixing mechanisms are sleeved on the stretching rubber sleeve, and the steel core fixing mechanism is used to fix the stretching steel core.

[0006] The support member is configured to be in an arc shape, and a certain gap is left between the multiple support members along the axial direction of the cable. The support member is provided with a through hole, a pad and a pressure plate. There are multiple through holes, and multiple through holes are opened on the support member. The stretched steel core slides through the through holes. The pad is fixedly connected to the side of the support member close to the aluminum alloy wire, and the pressure plate is fixedly connected to the side of the support member away from the aluminum alloy wire. The through hole is provided between the pad and the pressure plate, and a gap is left between the pad and the pressure plate.

[0007] The plurality of steel core fixing mechanisms are arranged at equal intervals in the axial direction of the aluminum alloy wire, and the adjacent steel core fixing mechanisms are arranged in a deflected manner. The steel core fixing mechanisms are arranged on one side of the support member where the pressure plate is arranged.

[0008] The steel core fixing mechanism includes a steel ring, a rubber sleeve support frame, a pad and an extrusion sheet. The steel ring fixing sleeve is arranged on the insulating layer. The rubber sleeve support frame is arranged in an arc shape. The rubber sleeve support frame is arranged between the stretching rubber sleeve and the filler. There are multiple rubber sleeve support frames, and the multiple rubber sleeve support frames are arranged in a circle. There are two pads, and the two pads are fixedly connected to the two sides of the rubber sleeve support frame. The pad is arranged between two adjacent stretching rubber sleeves to support the two stretching rubber sleeves. The extrusion sheet is arranged between the stretching rubber sleeve and the insulating layer. A screw is rotatably connected to the extrusion sheet. The screw passes through the insulating layer and the steel ring, and the screw is threadedly connected to the steel ring.

[0009] When the screw is rotated, the screw can push the extrusion sheet to extrude the pressing plate, so that the pressing plate and the backing plate extrude the tensile steel core.

[0010] The steel core connecting mechanism includes a sealing cover, an annular passage and a docking cover. There are multiple sealing covers, and the multiple sealing covers are arranged in opposite directions. The sealing covers are connected to the stretching rubber sleeve, and the sealing covers are fixedly connected to the stretching steel core. There are multiple docking covers on the annular passage, and the docking covers are staggered with the sealing covers. The multiple docking covers are arranged in opposite directions. The docking covers can be connected to the stretching rubber sleeve. The stretching steel core in the stretching rubber sleeve connected to the docking covers is connected through the annular passage, and the stretching steel core can slide in the annular passage.

[0011] The two ends of the stretch rubber sleeve are respectively docked with the sealing cover and the docking cover.

[0012] The working principle and beneficial effects of the present invention are: 1. In the present invention, by providing a stretched steel core and a stretched rubber sleeve, when the cable is bent, the stretched steel core slides on the support member in the stretched rubber sleeve. The friction of the stretched steel core can dampen the bending of the cable and enhance the tension. At the same time, the aluminum alloy wire can be protected by wrapping the stretched steel core and the stretched rubber sleeve around the aluminum alloy wire. 2. In the present invention, a steel core connecting mechanism is provided. When the cable is bent, the tensile steel core can slide in the steel core connecting mechanism, so that a connected tensile steel core can be provided in the oppositely arranged tensile rubber sleeve. When the cable is bent, the connected tensile steel core can slide in the steel core connecting mechanism due to the different radii of the inner and outer rings of the cable. The tensile steel core is then fixed by the steel core fixing mechanism, thereby fixing the bending radius and direction of the cable. 3. In the present invention, by providing a stretched steel core, on the one hand, the protection of the aluminum alloy wire can be improved, and on the other hand, the bending radius of the cable can be fixed by pulling the inner and outer circles of the stretched steel core when the cable is bent. By providing a steel core connecting mechanism, a longer stretched steel core can be provided at the opposite position. When the cable is bent, the stretched steel core slides and changes according to the bending of the inner and outer circles of the cable. By providing a steel core fixing mechanism, after the stretched steel core slides on the steel core connecting mechanism after the cable is bent, the stretched steel core is fixed. By fixing the position of the stretched steel core and preventing it from sliding, the bending radius of the cable is fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective; Figure 3 It is a schematic diagram of the overall internal cross-sectional structure of the present invention; Figure 4 It is a schematic diagram of a partial internal cross-sectional structure of the supporting member and the steel core fixing mechanism in the present invention; Figure 5 A schematic diagram of the partial structure of the support member and the steel core fixing mechanism in the present invention from another perspective; Figure 6 It is a schematic diagram of the partial structure of the steel core connecting mechanism and the stretch rubber sleeve in the present invention; Figure 7 Schematic diagram of the internal cross-sectional structure of the annular passage in the present invention; Figure 8 It is a schematic diagram of the local structure of two adjacent annular passages in the present invention.

[0015] In the figure: 1. Aluminum alloy conductor; 2. Filler; 3. Insulation layer; 4. Stretched rubber sleeve; 5. Stretched steel core; 6. Support member; 7. Through hole; 8. Pad; 9. Pressing plate; 10. Steel ring; 11. Rubber sleeve support frame; 12. Pad; 13. Extrusion sheet; 14. Screw; 15. Sealing cover; 16. Annular passage; 17. Docking cover. DETAILED DESCRIPTION

[0016] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making any creative efforts are within the scope of protection of the present invention.

[0017] like Figures 1 to 8As shown, this embodiment proposes an aluminum alloy conductor cross-linked polyethylene insulated power cable, including an aluminum alloy conductor 1, a filler 2 and an insulating layer 3, the filler 2 is arranged between multiple aluminum alloy conductors 1, and the insulating layer 3 is sleeved on the outside of the aluminum alloy conductor 1 and the filler 2, and also includes a stretching rubber sleeve 4, a stretching steel core 5, a support 6, a steel core connecting mechanism and a steel core fixing mechanism. There are multiple stretching rubber sleeves 4, and multiple stretching rubber sleeves 4 are circumferentially arranged between the insulating layer 3 and the filler 2. The stretching rubber sleeve 4 is arranged in an arc shape, and the interior is arranged to be hollow. There are multiple stretching steel cores 5, and each stretching rubber sleeve 4 is provided with multiple stretching steel cores 5. There are multiple support members 6, and each stretching rubber sleeve 4 is fixedly provided with multiple support members 6. The stretching steel core 5 passes through the support member 6. There are multiple steel core connecting mechanisms, and the steel core connecting mechanism is arranged between the insulating layer 3 and the filler 2. The stretching rubber sleeve 4 is arranged along Both ends of the cable in the axial direction are provided with steel core connecting mechanisms, which are used to connect the stretched steel cores 5 in the stretched rubber sleeves 4 arranged oppositely. There are multiple steel core fixing mechanisms, and multiple steel core fixing mechanisms are sleeved on the stretched rubber sleeve 4. The steel core fixing mechanism is used to fix the stretched steel core 5. Compared with the traditional aluminum alloy conductor cable, the power cable in this application arranges a stretched rubber sleeve 4 and a stretched steel core 5 on the periphery of the conductor. When the cable is bent, the inner and outer rings of the cable are bent so that the lengths of the stretched steel core 5 at different positions are different. The stretched steel core 5 moves on the steel core connecting mechanism and is then fixed by the steel core fixing mechanism to prevent the stretched steel core 5 from continuing to slide, thereby fixing the bending angle of the cable, which can avoid the cable bending angle being too large. At the same time, the stretched rubber sleeve 4 and the stretched steel core 5 wrapped around the aluminum alloy conductor 1 can also provide external protection for the aluminum alloy conductor 1.

[0018] like Figures 3 to 6 As shown, the support member 6 is set to an arc shape, and a certain gap is left between the multiple support members 6 along the axial direction of the cable. The support member 6 is provided with a through hole 7, a pad 8 and a pressure plate 9. There are multiple through holes 7. Multiple through holes 7 are opened on the support member 6. The stretched steel core 5 slides through the through holes 7. The pad 8 is fixedly connected to the side of the support member 6 close to the aluminum alloy wire 1. The pressure plate 9 is fixedly connected to the side of the support member 6 away from the aluminum alloy wire 1. The through hole 7 is provided between the pad 8 and the pressure plate 9. A gap is left between the pad 8 and the pressure plate 9. Both the pad 8 and the pressure plate 9 are provided with semicircles corresponding to the through holes 7. The tensile steel core 5 passes between the two semicircles. The support member 6 is fixed in the tensile rubber sleeve 4 through the pad 8 and the pressure plate 9. The tensile steel core 5 can be supported by the through holes 7, so that a certain distance is maintained between the multiple steel cores, preventing the tensile steel cores 5 from wearing each other when sliding. In this embodiment, four tensile rubber sleeves 4 are provided, which are arranged in pairs opposite to each other. There are ten tensile steel cores 5 in total, and the two ends of the five tensile steel cores 5 are respectively slidably provided in the two tensile rubber sleeves 4 arranged opposite to each other.

[0019] like Figures 3 to 6 As shown, multiple steel core fixing mechanisms are arranged at equal intervals in the axial direction of the aluminum alloy conductor 1, and adjacent steel core fixing mechanisms are arranged in a deflected manner. The steel core fixing mechanism is arranged on one side of the support member 6 where a pressure plate 9 is provided. The steel core fixing mechanism includes a steel ring 10, a rubber sleeve support frame 11, a pad 12 and an extrusion sheet 13. The steel ring 10 is fixedly sleeved on the insulating layer 3, and the rubber sleeve support frame 11 is arranged in an arc shape. The rubber sleeve support frame 11 is arranged between the stretched rubber sleeve 4 and the filler 2. The rubber sleeve support frame 11 is provided with multiple rubber sleeve support frames 11, and multiple rubber sleeve support frames 1 1 is arranged in a circle, and there are two pads 12. The two pads 12 are fixedly connected to both sides of the rubber sleeve support frame 11. The pads 12 are arranged between two adjacent stretching rubber sleeves 4 to support the two stretching rubber sleeves 4. The extrusion sheet 13 is arranged between the stretching rubber sleeve 4 and the insulating layer 3. A screw 14 is rotatably connected to the extrusion sheet 13. The screw 14 passes through the insulating layer 3 and the steel ring 10. The screw 14 is threadedly connected to the steel ring 10. When the screw 14 is rotated, the screw 14 can push the extrusion sheet 13 to extrude the pressure plate 9, so that the pressure plate 9 and The pad 8 squeezes the tensile steel core 5. When the screw 14 is rotated, the screw 14 pushes the extrusion sheet 13 toward the aluminum alloy conductor 1. The extrusion sheet 13 squeezes the tensile rubber sleeve 4 and squeezes the internal pressure plate 9 at the same time. The pressure plate 9 gradually bends toward the pad 8, so that the pressure plate 9 and the semicircular shape on the pad 8 press the tensile steel core 5 tightly, making it difficult for the tensile steel core 5 to slide. The rubber sleeve support frame 11 supports the pad 8 when the extrusion sheet 13 squeezes the pressure plate 9. The rubber sleeve support frame 11 is pressed on the filler 2 and supported by multiple rubber sleeves. The frame 11 supports and shapes the four stretching rubber sleeves 4 to prevent the rubber sleeve support frame 11 from offsetting when the cable is bent and rotated. The support of the stretching rubber sleeve 4 by the pad 12 can avoid the stretching of the stretching steel core 5 when the cable is bent, so that the stretching steel cable pulls the stretching rubber sleeve 4 to deflect. Each steel ring 10 corresponds to two extrusion sheets 13 and a rubber sleeve support frame 11. The rubber sleeve support frames 11 on adjacent steel rings 10 are staggered, so that the support members 6 in the four stretching rubber sleeves 4 can be squeezed respectively to fix the stretching steel core 5.

[0020] like Figures 6 to 8As shown, the steel core communication mechanism includes a sealing cover 15, an annular passage 16 and a docking cover 17. A plurality of sealing covers 15 are provided, and the plurality of sealing covers 15 are arranged in opposite directions. The sealing cover 15 is connected to the stretching rubber sleeve 4, and the sealing cover 15 is fixedly connected to the stretching steel core 5. A plurality of docking covers 17 are provided on the annular passage 16. The docking covers 17 and the sealing covers 15 are staggered. The plurality of docking covers 17 are arranged in opposite directions. The docking covers 17 can be connected to the stretching rubber sleeve 4. The stretching steel core 5 in the stretching rubber sleeve 4 connected to the docking covers 17 is connected through the annular passage 16, and the stretching steel core 5 can Sliding in the annular passage 16, two sealing covers 15 are provided, the sealing covers 15 are docked on the stretched rubber sleeve 4, and are fixedly connected to the end of the stretched steel core 5. The two oppositely arranged sealing covers 15 are respectively fixedly connected to the two ends of the stretched steel core 5, the docking covers 17 and the sealing covers 15 are staggered, and the stretched steel core 5 passes through the docking covers 17. When the cable is not bent, the central part of the stretched steel core 5 is in the annular passage 16, and the two ends of the annular passage 16 are connected to the two docking covers 17, bypassing one side of the aluminum alloy wire 1, and the center of the annular passage 16 is fixedly connected to a sealing cover 15.

[0021] like Figures 6 to 8 As shown, the two ends of the stretching rubber sleeve 4 are respectively docked with the sealing cover 15 and the docking cover 17. The stretching rubber sleeve 4 is provided with a certain length in the cable. Four circumferentially arranged stretching rubber sleeves 4 form a group. Two steel core connecting mechanisms are provided between two adjacent groups of stretching rubber sleeves 4 to connect with the two groups of stretching rubber sleeves 4 respectively. Since the annular passage 16 is wrapped around one side of the aluminum alloy wire 1, the two annular passages 16 between the two adjacent groups of stretching rubber sleeves 4 are arranged opposite to each other, so that the two annular passages 16 are staggered, reducing the space occupied by the annular passages 16 in the cable. A group of stretching rubber sleeves 4 on the cable and the steel core connecting mechanisms at both ends occupy a length of the cable. There are multiple sections on the cable. When the cable is bent and the bending angle of the cable is fixed, the steel core of the stretching wire can be fixed to the multiple sections respectively.

[0022] In this embodiment, when the cable is frequently bent, the stretched steel core 5 slides in the through hole 7 on the support 6, and the stretched steel core 5 slides in the annular passage 16. The sliding process of the stretched steel core 5 damps the bending of the cable to prevent the cable from bending too quickly. When the cable needs to be bent to an angle and then fixed, the cable is bent first. When it is bent to the required angle, the screw 14 is twisted, and the screw 14 pushes the extrusion piece 13 to slide toward the rubber sleeve support frame 11. The extrusion piece 13 squeezes the stretching rubber sleeve 4 and the pressure plate 9. The pressure plate 9 and the pad 8 squeeze the stretched steel core 5 at the same time, so that the stretched steel core 5 can no longer slide on the through hole 7. The stretched steel core 5 is fixed in the inner and outer circles of the cable bend and cannot slide, thereby fixing the bending direction and angle of the cable.

[0023] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An aluminum alloy conductor cross-linked polyethylene insulated power cable, comprising an aluminum alloy conductor (1), a filler (2) and an insulating layer (3), wherein the filler (2) is arranged between a plurality of the aluminum alloy conductors (1), and the insulating layer (3) is sheathed outside the aluminum alloy conductors (1) and the filler (2), characterized in that: Also includes: A plurality of stretching rubber sleeves (4) are provided, wherein the plurality of stretching rubber sleeves (4) are circumferentially arranged between the insulating layer (3) and the filler (2), and the stretching rubber sleeves (4) are arranged in an arc shape and are hollow inside; A plurality of stretching steel cores (5) are provided, and each of the stretching rubber sleeves (4) is provided with a plurality of the stretching steel cores (5); A plurality of support members (6) are provided, and each of the stretch rubber sleeves (4) is fixedly provided with a plurality of the support members (6), and the stretch steel core (5) passes through the support members (6); A plurality of steel core connecting mechanisms are provided, wherein the steel core connecting mechanisms are provided between the insulating layer (3) and the filler (2), and the steel core connecting mechanisms are provided at both ends of the stretch rubber sleeve (4) along the axial direction of the cable, and the steel core connecting mechanisms are used to connect the stretch steel cores (5) in the stretch rubber sleeves (4) provided opposite to each other; A plurality of steel core fixing mechanisms are provided, and the plurality of steel core fixing mechanisms are sleeved on the stretching rubber sleeve (4), and the steel core fixing mechanisms are used to fix the stretching steel core (5).

2. The aluminum alloy conductor cross-linked polyethylene insulated power cable according to claim 1, characterized in that: The support member (6) is configured to be arc-shaped, with a certain gap left between the plurality of support members (6) along the axial direction of the cable, and the support member (6) is provided with: A plurality of through holes (7) are provided, wherein the plurality of through holes (7) are opened on the support member (6), and the tensile steel core (5) slides through the through holes (7); A backing plate (8) is fixedly connected to a side of the support member (6) close to the aluminum alloy wire (1), A pressing plate (9) is fixedly connected to the support member (6) on a side away from the aluminum alloy wire (1), and the through hole (7) is arranged between the pad (8) and the pressing plate (9), with a gap left between the pad (8) and the pressing plate (9).

3. The aluminum alloy conductor cross-linked polyethylene insulated power cable according to claim 2, characterized in that: A plurality of the steel core fixing mechanisms are arranged at equal intervals in the axial direction of the aluminum alloy wire (1), and adjacent steel core fixing mechanisms are arranged in a deflected manner. The steel core fixing mechanisms are arranged on a side of the support member (6) where the pressure plate (9) is arranged.

4. The aluminum alloy conductor cross-linked polyethylene insulated power cable according to claim 3, characterized in that: The steel core fixing mechanism comprises: A steel ring (10) fixedly sleeved on the insulating layer (3); The rubber sleeve support frame (11) is arranged in an arc shape, and the rubber sleeve support frame (11) is arranged between the stretch rubber sleeve (4) and the filler (2). A plurality of the rubber sleeve support frames (11) are provided, and the plurality of rubber sleeve support frames (11) are arranged in a circumferential manner; Two pads (12) are provided, and the two pads (12) are fixedly connected to both sides of the rubber sleeve support frame (11). The pads (12) are provided between two adjacent stretch rubber sleeves (4) to support the two stretch rubber sleeves (4); An extruded sheet (13) is arranged between the stretch rubber sleeve (4) and the insulating layer (3).

5. The aluminum alloy conductor cross-linked polyethylene insulated power cable according to claim 4, characterized in that: A screw (14) is rotatably connected to the extruded sheet (13), the screw (14) passes through the insulating layer (3) and the steel ring (10), and the screw (14) is threadedly connected to the steel ring (10).

6. The aluminum alloy conductor cross-linked polyethylene insulated power cable according to claim 5, characterized in that: When the screw (14) is rotated, the screw (14) can push the extrusion sheet (13) to extrude the pressing plate (9), so that the pressing plate (9) and the backing plate (8) extrude the tensile steel core (5).

7. The aluminum alloy conductor cross-linked polyethylene insulated power cable according to claim 6, characterized in that: The steel core communication mechanism comprises: A plurality of sealing covers (15) are provided, and the plurality of sealing covers (15) are arranged in opposite directions. The sealing covers (15) are in contact with the stretch rubber sleeve (4), and the sealing covers (15) are fixedly connected to the stretch steel core (5); An annular passage (16) is provided with a plurality of docking covers (17), the docking covers (17) and the sealing covers (15) are arranged in a staggered manner, the plurality of docking covers (17) are arranged in opposite directions, and the docking covers (17) can be connected to the stretch rubber sleeve (4); The stretching steel core (5) in the stretching rubber sleeve (4) that is in contact with the docking cover (17) is connected via the annular passage (16), and the stretching steel core (5) is capable of sliding in the annular passage (16).

8. The aluminum alloy conductor cross-linked polyethylene insulated power cable according to claim 7, characterized in that: The two ends of the stretch rubber sleeve (4) are respectively docked with the sealing cover (15) and the docking cover (17).

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