Anticorrosive multi-core aluminum alloy overhead insulated cable

Abstract

The utility model relates to wire and cable technical field, more particularly to anticorrosive multicore aluminum alloy overhead insulated cable, include: a plurality of line core, the tangential setting between adjacent line core, filling structure, fill in the gap formed between adjacent line core, wrapping layer, the wrapping cladding in a plurality of line core and the outside of filling structure, and solidify as the cable core of circular section, metal shielding layer, cladding the outer layer of wrapping layer, sheath layer, extrusion cladding the outer wall of metal shielding layer. The application sets up spiral convex structure on the surface of line core reinforcing layer, changes the large area friction formed by the contact surface between line cores from surface contact into discrete, dynamic change convex structure contact, reduces friction area and friction force, reduces the abrasion problem of insulating layer caused by wind vibration, prolongs the overhead service life of cable, and the spiral airflow channel formed between convex structures promotes the air circulation in the cable, which is beneficial to heat dissipation during operation.

Description

Technical Field

[0001] This utility model relates to the field of wire and cable technology, and more specifically to a corrosion-resistant multi-core aluminum alloy overhead insulated cable. Background Technology

[0002] Multi-core aluminum alloy overhead insulated cables are key equipment used in outdoor overhead lines in power distribution networks. The standard structure of this type of cable typically consists of multiple independent insulated cores twisted together. Each insulated core comprises an aluminum alloy conductor and an extruded polyethylene or cross-linked polyethylene insulation layer. The multiple insulated cores are arranged in parallel or spiral twists, and the gaps between the cores may be filled with non-metallic materials to maintain the structural integrity. Ultimately, all components are encased in an outer sheath.

[0003] In current manufacturing practices, the cross-section of each insulated core is typically designed to be a standard circle, with a smooth cylindrical outer surface. When these insulated cores with smooth circular outer surfaces are twisted together, a large contact area is formed between adjacent cores. After installation, such cables are exposed to the natural environment for extended periods and must withstand various mechanical forces, including wind loads. The wind causes continuous high-frequency micro-vibrations in the cable, resulting in continuous, small-amplitude relative displacement and friction between the insulated cores within the stranded cable. This microscopic interaction between the contact surfaces of the insulated cores, induced by environmental excitation, is a typical operating condition that cables must face during long-term service. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by providing a corrosion-resistant multi-core aluminum alloy overhead insulated cable, comprising:

[0005] Multiple wire cores, with adjacent wire cores arranged tangentially;

[0006] A filler structure that fills the gaps formed between adjacent wire cores;

[0007] The cladding layer wraps around the outside of the multiple cores and the filling structure, and is fixed into a cable core with a circular cross-section.

[0008] A metal shielding layer is wrapped around the outer layer of the wrapping layer;

[0009] A sheath layer is extruded and covered on the outer wall of the metal shielding layer;

[0010] Each of the wire cores includes a conductor, an insulation layer, and a reinforcing layer. The surface of the reinforcing layer is provided with a protruding structure arranged spirally around the wire core axis. The protruding structures on the outer wall of each wire core are not completely interlocked with each other, and are in a state of periodic contact and separation.

[0011] Preferably, the conductor is a multi-layer stranded aluminum alloy conductor, with a water-resistant yarn wrapped around the outer layer of each aluminum alloy conductor.

[0012] Preferably, the insulating layer comprises a cross-linked polyethylene insulating layer, and the reinforcing layer is a nylon or thermoplastic polyurethane reinforcing layer.

[0013] Preferably, the protrusion structure is configured to be a dome trapezoidal shape along the cross-sectional direction of the cable.

[0014] Preferably, the height of the protrusion structure is 0.3 to 0.5 mm, and the width of the protrusion structure is 0.8 to 1.2 mm.

[0015] Preferably, the pitch difference of the spiral structure of the protrusions on the outer wall of the multiple cores is greater than 2mm.

[0016] Preferably, the helical pitch of the protrusion structure is 15-25 mm.

[0017] Preferably, the total thickness of the reinforcing layer and the raised structure is 20-25% of the thickness of the insulating layer.

[0018] Preferably, the reinforcing layer and raised structure outside each of the said wire cores are different colors.

[0019] Preferably, the filling structure includes a water-blocking rope, the metal shielding layer includes a longitudinally wrapped aluminum-plastic composite strip, and the sheath layer includes a PE sheath layer.

[0020] Compared with the prior art, the advantages of this utility model are:

[0021] This application sets a spiral protrusion structure on the surface of the core reinforcement layer, which changes the contact surface between the cores from a large-area friction formed by surface contact to a discrete, dynamically changing protrusion structure contact, reducing the friction area and friction force, reducing the insulation layer wear problem caused by wind vibration, and extending the overhead service life of the cable.

[0022] Furthermore, the spiral airflow channels formed between the raised structures promote air circulation inside the cable, which is beneficial for heat dissipation during operation and reduces the core temperature. At the same time, the water-blocking yarn wrapped around each layer of the conductor and the water-blocking rope filling form a double water-blocking barrier, which can effectively prevent moisture from penetrating longitudinally and radially and protect the aluminum alloy conductor from corrosion. Attached Figure Description

[0023] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of the corrosion-resistant multi-core aluminum alloy overhead insulated cable shown in the embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the cross-sectional structure of the corrosion-resistant multi-core aluminum alloy overhead insulated cable shown in the embodiment of this utility model;

[0026] Figure 3 This is a schematic diagram of the wire core structure shown in the embodiment of this utility model;

[0027] Figure 4 This is a schematic diagram of the cross-sectional structure of the wire core shown in an embodiment of this utility model. Detailed Implementation

[0028] To better understand the technical content of this utility model, specific embodiments are provided below in conjunction with the accompanying drawings.

[0029] Combination Figure 1 and Figure 2 As shown, this utility model proposes a corrosion-resistant multi-core aluminum alloy overhead insulated cable, including a cable core, a metal shielding layer 4, and a sheath layer 5.

[0030] Multiple tangential conductors 1 and a filling structure 2 filling the gaps between adjacent conductors 1 are wrapped and solidified by a sheathing layer 3 to form a cable core with a circular cross-section. A metallic shielding layer 4 covers the outer layer of the sheathing layer 3, and a sheathing layer 5 is extruded and covers the outer wall of the metallic shielding layer 4.

[0031] Each core 1 includes a conductor 11, an insulation layer 12, and a reinforcing layer 13. The surface of the reinforcing layer 13 is provided with a protruding structure 14 arranged spirally around the axis of the core 1. The protruding structures 14 on the outer wall of each core 1 are not completely engaged with each other and are in a state of periodic contact and separation.

[0032] In this way, the contact surface between adjacent conductors 1 changes from large-area friction to small-area contact of discrete, dynamically changing protruding structures 14, reducing insulation wear caused by wind vibration and extending the overhead service life of the cable.

[0033] In an optional embodiment, combined with Figure 3 and Figure 4 Conductor 11 is a multi-layer stranded aluminum alloy conductor, with a water-blocking yarn 111 wrapped around the outer layer of each aluminum alloy conductor.

[0034] In this way, the water-blocking yarn 111 forms an efficient longitudinal water-blocking structure between the conductors. When the outer sheath of the cable is accidentally damaged, the water-blocking yarn will expand rapidly after encountering water, blocking the stranding gaps of the conductors and preventing the water from spreading further along the longitudinal direction of the cable. This protects the aluminum alloy conductor from electrochemical corrosion and improves the safety and service life of the cable in humid environments.

[0035] Furthermore, the insulation layer 12 includes a cross-linked polyethylene insulation layer, and the reinforcing layer 13 is a nylon or thermoplastic polyurethane reinforcing layer.

[0036] Thus, the inner cross-linked polyethylene insulation layer provides excellent electrical insulation performance and heat resistance, while the outer nylon or TPU layer provides abrasion resistance, mechanical strength and impact resistance far exceeding those of the cross-linked polyethylene insulation layer.

[0037] In a preferred embodiment, the protrusion structure 14 is configured as a dome trapezoidal shape along the cross-sectional direction of the cable. Thus, the dome trapezoidal protrusion structure 14 combines structural strength with high wear resistance, avoiding stress concentration caused by sharp angles.

[0038] In an optional embodiment, the height of the protrusion 14 is 0.3–0.5 mm, and the width of the protrusion 14 is 0.8–1.2 mm. This ensures the structural strength of the protrusion 14, which is used to support the contact between the wire cores.

[0039] Preferably, the helical pitch of the raised structures 14 on the outer wall of the multiple cores 1 differs by more than 2 mm. Thus, due to the different pitches, the raised structures 14 of any two cores 1 will not be fully engaged after twisting, but rather in a dynamic state of intermittent contact and separation. This allows wear to be evenly distributed across the entire core surface, preventing premature wear in certain areas. Even when the raised structures are in contact, the surrounding gaps remain unobstructed in most areas, ensuring the effectiveness of heat dissipation and drainage channels.

[0040] In the above embodiments, the helical pitch of the protrusion structure 14 is 15-25 mm.

[0041] In the above embodiments, the total thickness of the reinforcing layer 13 and the protrusion structure 14 is 20 to 25% of the thickness of the insulating layer 12.

[0042] In this way, the reinforcing layer 13 has sufficient thickness to support the raised structure and provide effective abrasion protection, while not excessively weakening the thickness of the insulation layer 12, which is the main electrical component, thus ensuring that the insulation reliability of the cable meets the standard requirements.

[0043] Preferably, the reinforcing layer 13 and the raised structure 14 outside each wire core 1 are different colors.

[0044] In this way, construction or maintenance personnel do not need to peel off the sheath or rely on the label tape. They can quickly and accurately distinguish the wire cores simply by observing their color, which is helpful for identifying different types of wire cores.

[0045] Furthermore, the filling structure 2 includes water-blocking ropes. Filling the space between the cores 1 with water-blocking ropes ensures the cable's roundness and provides good radial and axial water-blocking properties, thus preventing corrosion.

[0046] Furthermore, the metal shielding layer 4 includes a longitudinally wrapped aluminum-plastic composite strip. Thus, the addition of the aluminum-plastic composite strip further enhances the radial water-blocking effect of the cable.

[0047] In an optional embodiment, the sheath layer 5 includes a PE sheath layer. It should be understood that the PE sheath has good mechanical protection, weather resistance, and flame retardancy, and can meet the requirements for outdoor use of overhead cables.

[0048] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A corrosion-resistant multi-core aluminum alloy overhead insulated cable, characterized in that, include: Multiple wire cores (1), with adjacent wire cores (1) arranged tangentially; The filling structure (2) fills the gap formed between adjacent wire cores (1); The wrapping layer (3) wraps around the outside of the multiple cores (1) and the filling structure (2) and is fixed into a cable core with a circular cross-section. A metal shielding layer (4) covers the outer layer of the wrapping layer (3); Sheath layer (5) is extruded and covered on the outer wall of the metal shielding layer (4); Each of the wire cores (1) includes a conductor (11), an insulation layer (12), and a reinforcing layer (13). The surface of the reinforcing layer (13) is provided with a protruding structure (14) arranged spirally around the axis of the wire core (1). The protruding structures (14) on the outer wall of each wire core (1) are not completely engaged with each other and are in a state of periodic contact and separation.

2. The corrosion-resistant multi-core aluminum alloy overhead insulated cable according to claim 1, characterized in that, The conductor (11) is a multi-layer stranded aluminum alloy conductor, with a water-blocking yarn (111) wrapped around the outer layer of each aluminum alloy conductor.

3. The corrosion-resistant multi-core aluminum alloy overhead insulated cable according to claim 1, characterized in that, The insulation layer (12) includes a cross-linked polyethylene insulation layer, and the reinforcing layer (13) is a nylon or thermoplastic polyurethane reinforcing layer.

4. The corrosion-resistant multi-core aluminum alloy overhead insulated cable according to claim 1, characterized in that, The protruding structure (14) is constructed to be a dome trapezoidal shape along the cross-sectional direction of the cable.

5. The corrosion-resistant multi-core aluminum alloy overhead insulated cable according to claim 1, characterized in that, The height of the protrusion structure (14) is 0.3 to 0.5 mm, and the width of the protrusion structure (14) is 0.8 to 1.2 mm.

6. The corrosion-resistant multi-core aluminum alloy overhead insulated cable according to claim 1, characterized in that, The pitch of the spiral structure (14) on the outer wall of the multiple cores (1) differs by more than 2 mm.

7. The corrosion-resistant multi-core aluminum alloy overhead insulated cable according to claim 1, characterized in that, The spiral pitch of the protrusion structure (14) is 15-25 mm.

8. The corrosion-resistant multi-core aluminum alloy overhead insulated cable according to any one of claims 1-7, characterized in that, The total thickness of the reinforcing layer (13) and the protruding structure (14) is 20 to 25% of the thickness of the insulating layer (12).

9. The corrosion-resistant multi-core aluminum alloy overhead insulated cable according to any one of claims 1-7, characterized in that, The reinforcing layer (13) and the raised structure (14) outside each of the said wire cores (1) are different colors.

10. The corrosion-resistant multi-core aluminum alloy overhead insulated cable according to claim 1, characterized in that, The filling structure (2) includes a water-blocking rope, the metal shielding layer (4) includes a longitudinally wrapped aluminum-plastic composite strip, and the sheath layer (5) includes a PE sheath layer.

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