Aluminium alloy cable

Abstract

The present application belongs to the field of cable, and particularly relates to a special-shaped aluminum alloy cable. It comprises a center core, a sheath layer and an anti-extrusion fixing set. The sheath layer is in an oval shape in the radial section of the cable, and the center core is arranged at the geometric center of the sheath layer. The anti-extrusion fixing set comprises a W-shaped support and a C-shaped support. The W-shaped support is arranged at both ends of the center core along the long axis direction of the sheath layer. The C-shaped support is arranged at both ends of the center core along the short axis direction of the sheath layer, and the two ends are respectively abutted on both sides of the two W-shaped supports along the short axis direction. The middle part of the arc-shaped section of the C-shaped support is provided with a puncture rib, which is in a needle shape in the radial section of the cable. The aluminum alloy cable has the effects of light weight and anti-pressure performance of the buried cable through the cooperation of multiple structures, and is used for improving the supporting capacity in the cable. In addition, the sharp end discharge problem of the cable can be effectively avoided, and the safety of the cable is improved.

Description

Technical Field

[0001] This invention belongs to the field of cables, and particularly relates to a special-shaped aluminum alloy cable. Background Technology

[0002] Aluminum alloy cables are a new type of power cable made of AA8030 series aluminum alloy material as the conductor, using advanced technologies such as special compaction and annealing treatment. They are a low-cost alternative to traditional oxygen-free copper power cables, and compared to pure aluminum cables, they offer improvements in various performance aspects, meeting the standards for use under most conditions.

[0003] However, current aluminum alloy cables also have certain drawbacks, the most prominent being their difficulty in underground installations. Underground cables require high structural strength and resistance to extrusion deformation, or, like traditional oxygen-free copper cables, the ability to maintain their electrical performance even after deformation under pressure. However, due to the unique properties of the conductor, aluminum alloy cables are prone to rapid performance degradation after extrusion deformation. Therefore, when aluminum alloy cables are used for underground installations, extensive protective measures are typically required, such as pre-buried cable ducts. Furthermore, the cables themselves are not suitable for extensive armor layers, as this can easily lead to point discharge problems and cause a sharp increase in cable weight, which contradicts the original design intent of aluminum alloy cables.

[0004] Therefore, there is an urgent need to develop an aluminum alloy cable suitable for burial. Summary of the Invention

[0005] To address the problems that existing aluminum alloy cables are unsuitable for underground installation, that traditional installation methods lead to significantly increased installation costs, and that some processes for strengthening the cable's resistance to extrusion deformation are not applicable to cables, this invention provides a special-shaped aluminum alloy cable.

[0006] The main objective of this invention is: 1. Ensure that the cable of this invention can be effectively used for underground installation; Second, it can effectively improve the cable's resistance to pressure and deformation; 3. Reduce the risk of cable tip discharge.

[0007] To achieve the above objectives, the present invention adopts the following technical solution.

[0008] A special-shaped aluminum alloy cable, comprising: Center core wire, sheath layer, and compression-resistant fixing kit; The sheath layer is elliptical in the radial cross-section of the cable, with the central core wire located at the geometric center of the sheath layer. The anti-compression fixing kit consists of W-shaped supports and C-shaped supports; The W-shaped support is arranged at both ends of the central core wire along the long axis of the sheath layer, and the double-opening side of the W-shaped support on the radial cross section of the cable faces outward along the long axis. The C-shaped support is arranged at both ends of the central core wire along the short axis of the sheath layer, and the two C-shaped ends of the C-shaped support abut against the two W-shaped supports on both sides along the short axis. The arc section of the C-shaped support is provided with a piercing rib, which is needle-shaped on the radial cross section of the cable.

[0009] As a preferred option The sheath layer is provided with a groove structure for setting a W-shaped support member. The inner side wall of the groove structure along the long axis direction is attached to the W-shaped support member, and the opposite outer side wall forms an arc-shaped protrusion corresponding to the opening of the W-shaped support member. The arc-shaped protrusion engages with the double openings of the W-shaped support, but does not completely fill the openings.

[0010] As a preferred option There is a cavity between the arc-shaped protrusion and the opening, and the cavity is filled with nylon filler rope.

[0011] As a preferred option The C-shaped support member has flat abutment joints at both ends of the C-shape.

[0012] As a preferred option The W-shaped and C-shaped supports are made of elastic materials.

[0013] As a preferred option An insulating gel layer is provided on the outer surface of the central core wire.

[0014] As a preferred option A hollow elastic tube is provided on the inner side of the puncture rib, and a corresponding fixing groove is provided on the insulating gel layer to fix the hollow elastic tube.

[0015] As a preferred option The hollow elastic tube is filled with nylon filling yarn.

[0016] As a preferred option The central core wire is composed of several conductive wires wrapped in an insulating bundle tube, and the outer surface of the central core wire is also covered with a heat insulation layer.

[0017] The beneficial effects of this invention are: The aluminum alloy cable of this invention is lightweight and achieves improved compressive strength after burial through multi-structure combination. It is also used to improve the internal support capacity of the cable and effectively avoid the problem of tip discharge, thereby improving the safety of the cable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram showing the force applied to the cable of the present invention; Figure 3 This is a schematic diagram of the local stress on the cable of the present invention; In the picture: 100 Core wire, 101 Conductive wire, 102 Insulation layer, 200 Sheath layer, 201 Arc-shaped protrusion, 2011 Nylon filler rope, 300 Insulating gel layer, 301 Fixing groove, 400 Hollow elastic tube, 401 Nylon filler yarn, 500 W-shaped support, 600 C-shaped support, 601 Abutment joint, 602 Puncture rib, 700 Soil layer. Detailed Implementation

[0019] The present invention will be further described clearly and in detail below with reference to specific embodiments and the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Furthermore, the embodiments of the present invention described below are generally only some, not all, of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "thickness," "upper," "lower," "horizontal," "top," "bottom," "inner," "outer," "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified, and "several" means one or more.

[0021] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] Unless otherwise specified, all raw materials used in the embodiments of the present invention are commercially available or obtainable by those skilled in the art; unless otherwise specified, all methods used in the embodiments of the present invention are methods mastered by those skilled in the art.

[0023] Example: A kind of Figure 1 The irregular aluminum alloy cable shown specifically includes: Center core wire 100, sheath layer 200, and anti-crush fixing kit; The central core wire 100 is composed of several conductive wires 101 wrapped with an insulating bundle tube, and the outer surface of the central core wire 100 is also covered with a heat insulation layer 102. The sheath layer 200 is elliptical in the radial cross-section of the cable, and the central core wire 100 is located at the geometric center of the sheath layer 200. The anti-compression fixing kit consists of a W-shaped support 500 and a C-shaped support 600; The W-shaped support 500 is disposed at both ends of the central core wire 100 along the long axis of the sheath layer 200, and the double-opening side of the W-shaped support 500 on the radial cross section of the cable faces outward along the long axis. The corresponding sheath layer 200 is provided with a groove structure for setting the W-shaped support 500. The inner side wall of the groove structure along the long axis is attached to the W-shaped support 500, and the opposite outer side wall forms an arc-shaped protrusion 201 corresponding to the opening of the W-shaped support 500. The arc-shaped protrusion 201 engages with the double opening of the W-shaped support 500, but is not completely filled in the opening. There is a cavity between the arc-shaped protrusion 201 and the opening, and the cavity is filled with nylon filler rope 2011. The C-shaped support 600 is arranged at both ends of the central core line 100 along the short axis direction of the sheath layer 200, and the C-shaped ends of the C-shaped support 600 respectively abut against the two W-shaped support 500 on both sides along the short axis direction. In order to improve the abutment stability, the C-shaped support 600 is provided with a flat plate abutment joint 601 at both ends of the C-shaped support 600. Furthermore, the C-shaped support 600 has a piercing rib 602 in the middle of the arc-shaped section, and the piercing rib 602 is needle-shaped in the radial cross section of the cable.

[0024] The above structure gives the cable of this invention excellent burial performance. Aluminum alloy cable is a low-cost alternative to traditional oxygen-free copper cable. It also has good conductivity and practicality, but there are some differences between the two. One of the most significant differences is that aluminum alloy cable has weaker compressive strength than oxygen-free copper cable. It is more prone to damage or even failure under strong external pressure. This defect is particularly noticeable when aluminum alloy cable is buried. Unlike oxygen-free copper, the extrusion deformation of aluminum alloy will cause its conductivity to drop sharply. At present, apart from using a thick armor layer for protection or setting up independent pre-buried pipes, there is no effective solution to this problem. However, the above methods are contrary to the original intention of low cost, low specific gravity and easy transportation of aluminum alloy cable. Moreover, the metal armor layer is also prone to point discharge, which increases the safety hazards of cable use. In view of this, the present invention adopts a completely different technical solution. This invention relates to a non-circular aluminum alloy cable, which differs from traditional cables in that it employs an elliptical cross-section. This design ensures that the major axis of the cable cross-section is vertically aligned during use, thus... Figure 2 As shown, after installation, the actual force on the cable is along its long axis. Traditional circular cables gradually transform into elliptical shapes with their long axis horizontal after being subjected to vertical force, and are subjected to more and greater forces, causing them to tend to be flattened over a long period of time. However, the present invention tends to transform into a circular shape after being subjected to external force along its long axis. In this process, the present invention also adopts a unique anti-compression fixing kit. The W-shaped support 500 and the C-shaped support 600 will cooperate with each other to transform the external force on the cable, so as to avoid the cable being continuously compressed, and at the same time, they can play a certain role in fixing the cable. Specifically, when the cable is subjected to a force along its long axis, the W-shaped support 500 will expand along the short axis of the cable cross-section. Due to the W-shaped support 500, the deformation trend of the C-shaped support 600 is altered. Instead of bulging outwards along its arch direction as it would when installed alone, the C-shaped support 600 will exhibit a tendency to retract and / or translate due to the cooperative connection between the W-shaped support 500 and the C-shaped support 600. Simultaneously, the sheath layer 200... The wall thickness at both ends of the axis will be reduced due to the deformation, displacement and stretching of the internal structure, so that the piercing rib 602 can pierce the sheath layer 200 and extend into the soil layer 700 after burial, thereby enhancing the stability of the cable installation. At the same time, the soil layer 700 can strengthen the support strength of the W-shaped support 500 and the C-shaped support 600. On the other hand, during the above deformation process, the lateral width of the cable after burial will not be significantly increased, so as to avoid the vicious cycle of the cable being flattened and flattened after burial.

[0025] Furthermore, The W-shaped support 500 and C-shaped support 600 can be made of metal or other non-metallic elastic materials with relatively high strength. In this embodiment, lightweight spring steel is used to avoid excessive increase in the specific gravity of the cable. In conventional cables, additional metal components should not be installed or should be avoided as much as possible to prevent problems such as induced electricity and point discharge. However, the cable structure of this invention is unique. Firstly, it is designed for burial, and the use of metal components ensures that the anti-compression fixing kit has high structural strength and produces better performance. Secondly, due to the unique structure and usage of the C-shaped support 600 of this invention, the piercing rib 602 can not only effectively fix the cable and produce good anti-compression effect, but also act as a "grounding wire". The charge accumulated by the W-shaped support 500 and C-shaped support 600 during cable operation can be quickly released into the soil layer 700 through the piercing rib 602, thereby eliminating the safety hazards caused by metal components.

[0026] Furthermore, The outer surface of the central core wire 100 is provided with an insulating gel layer 300. Due to the structural characteristics of the cable of the present invention, the multiple components inside the cable will deform and conduct force after being buried, which will lead to various extrusion forces inside. Therefore, the central core wire 100 may be subjected to a large force during this process. The insulating gel layer 300 can enhance the insulation protection effect and also play a certain buffering role. Furthermore, a hollow elastic tube 400 is provided on the inner side of the puncture rib 602, and the insulating gel layer 300 is correspondingly provided with a fixing groove 301 for fixing the hollow elastic tube 400. The hollow elastic tube 400 is filled with nylon filling yarn 401, which has a relatively large coefficient of thermal expansion, such as... Figure 3 As shown, this allows the cable to expand further after heating up during operation, pushing out the piercing rib 602, thus enabling the cable to be transformed into a strong support structure more quickly and effectively fixed in the soil layer 700.

Claims

1. A special-shaped aluminum alloy cable, characterized in that, include: Center core wire, sheath layer, and compression-resistant fixing kit; The sheath layer is elliptical in the radial cross-section of the cable, with the central core wire located at the geometric center of the sheath layer. The anti-compression fixing kit consists of W-shaped supports and C-shaped supports; The W-shaped support is arranged at both ends of the central core wire along the long axis of the sheath layer, and the double-opening side of the W-shaped support on the radial cross section of the cable faces outward along the long axis. The C-shaped support is arranged at both ends of the central core wire along the short axis of the sheath layer. The two ends of the C-shaped support abut against the two W-shaped supports on both sides along the short axis. The arc section of the C-shaped support is provided with a piercing rib, which is needle-shaped on the radial cross section of the cable.

2. The shaped aluminum alloy cable according to claim 1, characterized in that, The sheath layer is provided with a groove structure for setting a W-shaped support member. The inner side wall of the groove structure along the long axis direction is attached to the W-shaped support member, and the opposite outer side wall forms an arc-shaped protrusion corresponding to the opening of the W-shaped support member. The arc-shaped protrusion engages with the double openings of the W-shaped support, but does not completely fill the openings.

3. The shaped aluminum alloy cable according to claim 2, characterized in that, There is a cavity between the arc-shaped protrusion and the opening, and the cavity is filled with nylon filler rope.

4. A special-shaped aluminum alloy cable according to claim 1, 2, or 3, characterized in that, The C-shaped support member has flat abutment joints at both ends of the C-shape.

5. The shaped aluminum alloy cable according to claim 1, characterized in that, The W-shaped and C-shaped supports are made of elastic materials.

6. The shaped aluminum alloy cable according to claim 1, characterized in that, An insulating gel layer is provided on the outer surface of the central core wire.

7. A special-shaped aluminum alloy cable according to claim 6, characterized in that, A hollow elastic tube is provided on the inner side of the puncture rib, and a corresponding fixing groove is provided on the insulating gel layer to fix the hollow elastic tube.

8. A special-shaped aluminum alloy cable according to claim 7, characterized in that, The hollow elastic tube is filled with nylon filling yarn.

9. A special-shaped aluminum alloy cable according to claim 1, characterized in that, The central core wire is composed of several conductive wires wrapped in an insulating bundle tube, and the outer surface of the central core wire is also covered with a heat insulation layer.

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