An aluminum / aluminum alloy core coaxial cable
Patent Information
- Application Number
- CN202521915588.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-05
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-09-05
AI Technical Summary
[0002]中压10kV同轴电缆现无国家标准，生产产品内导体为铜芯导体+外导体以铜单线铠装型式制成，内、外导体的导体电阻均按GB/T 3956-2008对应截面的20°C导体最大电阻进行考核，因此在生产电缆截面较大的产品时，为了满足外导体的电阻要求，大截面电缆存在铠装一层铜单线的情况下无法满足标准导体电阻要求
本实用新型实施例提供了一种铝/铝合金芯同轴电缆，其包括由内至外的内导体、导体屏蔽层、绝缘层、绝缘屏蔽层、外导体层、包带层以及护套层，其中内导体由铝或铝合金材质制成，外导体层为单层结构，由多个同心设置的铜单线组成。相比于现有同轴电缆来说，其具有以下优点：
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Figure CN224745493U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cable technology, and more specifically, to an aluminum / aluminum alloy core coaxial cable. Background Technology
[0002] There is currently no national standard for 10kV medium-voltage coaxial cables. The manufactured products consist of a copper core conductor as the inner conductor and an outer conductor armored with single copper wires. The conductor resistance of both the inner and outer conductors is tested according to the maximum conductor resistance at 20°C for the corresponding cross-section in GB / T 3956-2008. Therefore, when producing cables with larger cross-sections, the standard conductor resistance requirement cannot be met even with an additional layer of copper single-wire armor. To address this issue, existing technology typically uses an additional second layer of armor to meet the outer conductor resistance requirement. However, this method has significant drawbacks. Even with an increase in the inner conductor cross-section, the resistance of a single layer of copper single wires does not change significantly. Theoretically, only a small amount of additional copper single wires is needed to meet the resistance requirement. However, to maintain the overall balance of the cable, it is impractical to simply distribute a few copper single wires haphazardly outside the single layer. As a compromise, the diameter of the armored copper wires must be appropriately reduced before adding an additional layer of copper single wires. This extra layer of copper single wires is redundant and wastes materials. Furthermore, from the perspective of processing complexity, processing double-layer copper single wires is more complex than processing single-layer copper single wires, which will affect processing efficiency. Utility Model Content
[0003] The purpose of this invention is to provide an aluminum / aluminum alloy core coaxial cable with a novel structure. While maintaining the same current carrying capacity, it can meet the resistance requirements with a single layer of copper wire, avoiding material waste and reducing processing difficulty.
[0004] The embodiments of this utility model are implemented as follows: An aluminum / aluminum alloy core coaxial cable includes, from the inside out, an inner conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, an outer conductor layer, a wrapping layer, and a sheath layer, wherein the inner conductor is made of aluminum or aluminum alloy, and the outer conductor layer is a single-layer structure composed of multiple concentric copper single wires.
[0005] Furthermore, in other preferred embodiments of this invention, the cross-sectional area of the inner conductor is 120~630 mm². 2 It is made of monofilaments with a diameter of 1.68~3.75 mm twisted together, with a twisting pitch ratio of 12~30D.
[0006] Furthermore, in other preferred embodiments of this utility model, the inner conductor is layered stranded, with the stranding pitch ratio of the center layer being 18~30D, the stranding pitch ratio of the middle layer being 14~18D, and the stranding pitch ratio of the outer layer being 10~14D.
[0007] Furthermore, in other preferred embodiments of this utility model, the insulating layer is a polybutene insulating layer with a thickness of 4.0~4.8mm.
[0008] Furthermore, in other preferred embodiments of this utility model, the equivalent radial thickness of the copper single wire is 1.8~6.0mm, and the diameter of the single wire is 1.8~3.1mm.
[0009] Furthermore, in other preferred embodiments of this utility model, the conductor shielding layer is made of cross-linked semiconducting shielding material with a thickness of 0.6~0.8mm.
[0010] Furthermore, in other preferred embodiments of this utility model, the insulating shielding layer is made of cross-linked peelable semiconductive shielding material with a thickness of 0.5~0.7mm.
[0011] Furthermore, in other preferred embodiments of this utility model, the sheath layer is made of cross-linked polyethylene with a thickness of 4.0~4.8 mm.
[0012] The beneficial effects of this utility model embodiment are: This utility model provides an aluminum / aluminum alloy core coaxial cable, comprising, from the inside out, an inner conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, an outer conductor layer, a wrapping layer, and a sheath layer. The inner conductor is made of aluminum or aluminum alloy, and the outer conductor layer is a single-layer structure composed of multiple concentrically arranged copper single wires. Compared to existing coaxial cables, it has the following advantages: 1) Under the same current carrying capacity, the diameter of aluminum / aluminum alloy core conductor is about 1.3 times larger than that of copper core conductor. With the insulation layer thickness remaining unchanged, the outer perimeter of the insulation layer will also increase accordingly, which can accommodate more copper single wires in a single layer structure, thereby meeting the resistance requirements of the outer conductor layer. 2) The finished diameter of this aluminum / aluminum alloy core coaxial cable is larger than that of a copper core coaxial cable with the same current carrying capacity, thus providing a larger heat dissipation area and better heat dissipation performance; 3) Using aluminum or aluminum alloys as the inner conductor is cheaper than copper, giving it a cost advantage. Attached Figure Description
[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1A cross-sectional view of an aluminum / aluminum alloy core coaxial cable provided in an embodiment of this utility model.
[0015] Icons: 100 - Aluminum / aluminum alloy core coaxial cable; 111 - Inner conductor; 112 - Conductor shielding layer; 113 - Insulation layer; 114 - Insulation shielding layer; 115 - Outer conductor layer; 1151 - Copper single wire; 116 - Wrapping layer; 117 - Sheath layer. Detailed Implementation
[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0017] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component 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 this utility model.
[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0019] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 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. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Example
[0021] This embodiment provides an aluminum / aluminum alloy core coaxial cable 100, referencing... Figure 1 As shown, it includes, from the inside out, an inner conductor 111, a conductor shielding layer 112, an insulation layer 113, an insulation shielding layer 114, an outer conductor layer 115, a wrapping tape layer 116, and a sheath layer 117.
[0022] Among them, such as Figure 1As shown, the inner conductor 111 is made of aluminum or aluminum alloy, and the outer conductor layer 115 is a single-layer structure composed of multiple concentrically arranged copper single wires 1151. In the prior art, the inner conductor 111, as the core part for transmitting electrical energy, often uses copper, which has better conductivity and reliability, and can operate stably in complex power transmission environments. However, in order to ensure the electromagnetic shielding, grounding, and other safety performance of the outer conductor, the larger the cross-sectional area of the inner conductor 111, the greater the resistance requirement of the corresponding outer conductor. When a single layer of copper single wires 1151 cannot meet the resistance requirement, it is necessary to add a second layer of copper single wires 1151, resulting in material waste and increased processing complexity. The aluminum / aluminum alloy core coaxial cable 100 of this invention replaces the copper inner conductor 111 with an aluminum / aluminum alloy inner conductor 111. Under the same current carrying capacity, the diameter of the aluminum / aluminum alloy core conductor is about 1.3 times larger than that of the copper core conductor. While keeping the thickness of the insulation layer 113 unchanged, the outer perimeter of the insulation layer 113 also increases accordingly, allowing more copper single wires 1151 to be accommodated in a single-layer structure, thus meeting the resistance requirements of the outer conductor layer 115. It should be noted that if the aluminum / aluminum alloy core is not replaced, the outer perimeter of the insulation layer 113 can also be increased by increasing its thickness, similarly accommodating more copper single wires 1151 in a single-layer structure. However, this increase in insulation layer 113 thickness leads to a decrease in the cable's heat dissipation performance and mechanical strength, reducing its service life. In contrast, this invention increases the heat dissipation area while maintaining the same insulation layer 113 thickness, resulting in improved overall heat dissipation performance and a greater advantage.
[0023] Furthermore, the cross-sectional area of the inner conductor 111 is 120~630 mm². 2 It is made of single wires with a diameter of 1.68~3.75 mm twisted together, with a twisting pitch ratio of 12~30D. This range covers commonly used specifications for 10kV cables, and is equivalent to replacing 70~400 mm² cables. 2 The copper inner conductor 111.
[0024] Optionally, the inner conductor 111 is layered stranded, with the center layer having a stranding pitch ratio of 18~30D, the middle layer having a stranding pitch ratio of 14~18D, and the outer layer having a stranding pitch ratio of 10~14D. Because the aluminum / aluminum alloy of the inner conductor 111 and the copper of the outer conductor have different coefficients of thermal expansion, this invention employs layered stranding technology to address the shear stress caused by this difference. The center layer uses a tighter pitch to provide better compressive and bending resistance; the middle layer uses a moderate pitch to serve as the main conductor and provide mechanical transition; and the outer layer uses a looser pitch to compensate for thermal expansion and contraction and to prevent creep.
[0025] Furthermore, such as Figure 1As shown, the insulation layer 113 is a cross-linked polyethylene layer with a thickness of 4.0~4.8mm. This allows for better buffering of stress caused by differences in thermal expansion coefficients.
[0026] The equivalent radial thickness of copper single-wire 1151 is 1.8~6.0mm, and the single wire diameter is 1.8~3.1mm. Within this range, the resistance requirements can be better met, achieving a better shielding and grounding effect.
[0027] Furthermore, such as Figure 1 As shown, the conductor shielding layer 112 is made of cross-linked semi-conductive shielding material with a thickness of 0.6~0.8mm. The insulating shielding layer 114 is made of cross-linked peelable semi-conductive shielding material with a thickness of 0.5~0.7mm. The sheath layer 117 is made of cross-linked polyethylene with a thickness of 4.0~4.8mm. With the above dimensions and materials, the layers of this aluminum / aluminum alloy core coaxial cable 100 are rationally matched, resulting in better overall performance.
[0028] In summary, this utility model embodiment provides an aluminum / aluminum alloy core coaxial cable 100, which includes, from the inside out, an inner conductor 111, a conductor shielding layer 112, an insulation layer 113, an insulation shielding layer 114, an outer conductor layer 115, a wrapping layer 116, and a sheath layer 117. The inner conductor 111 is made of aluminum or aluminum alloy, and the outer conductor layer 115 is a single-layer structure composed of multiple concentrically arranged copper single wires 1151. Compared to existing coaxial cables, it has the following advantages: Under the same current carrying capacity, the diameter of the aluminum / aluminum alloy core conductor is about 1.3 times larger than that of the copper core conductor. With the insulation layer 113 thickness remaining unchanged, the outer perimeter of the insulation layer 113 will also increase accordingly, allowing more copper single wires 1151 to be accommodated in a single-layer structure, thereby meeting the resistance requirements of the outer conductor layer 115; the finished diameter of this aluminum / aluminum alloy core coaxial cable 100 is larger than that of a copper core coaxial cable with the same current carrying capacity, thus having a larger heat dissipation area and better heat dissipation performance; using aluminum or aluminum alloy as the inner conductor 111 is cheaper than copper, giving it a cost advantage.
[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. An aluminum / aluminum alloy core coaxial cable, characterized in that, It includes, from the inside out, an inner conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, an outer conductor layer, a wrapping layer, and a sheath layer, wherein the inner conductor is made of aluminum or aluminum alloy, and the outer conductor layer is a single-layer structure composed of multiple concentric copper single wires.
2. The aluminum / aluminum alloy core coaxial cable according to claim 1, characterized in that, The cross-sectional area of the inner conductor is 120~630 mm². 2 It is made of monofilaments with a diameter of 1.68~3.75 mm twisted together, with a twisting pitch ratio of 12~30D.
3. The aluminum / aluminum alloy core coaxial cable according to claim 2, characterized in that, The inner conductor is stranded in layers, with the stranding pitch ratio of the center layer being 18~30D, the stranding pitch ratio of the middle layer being 14~18D, and the stranding pitch ratio of the outer layer being 10~14D.
4. The aluminum / aluminum alloy core coaxial cable according to claim 3, characterized in that, The insulating layer is a cross-linked polyethylene layer, and the thickness of the insulating layer is 4.0~4.8mm.
5. The aluminum / aluminum alloy core coaxial cable according to claim 4, characterized in that, The equivalent radial thickness of the copper single wire is 1.8~6.0mm, and the diameter of the single wire is 1.8~3.1mm.
6. The aluminum / aluminum alloy core coaxial cable according to claim 5, characterized in that, The conductor shielding layer is made of cross-linked semi-conductive shielding material with a thickness of 0.6~0.8mm.
7. The aluminum / aluminum alloy core coaxial cable according to claim 6, characterized in that, The insulating shielding layer is made of cross-linked peelable semi-conductive shielding material with a thickness of 0.5~0.7mm.
8. The aluminum / aluminum alloy core coaxial cable according to claim 7, characterized in that, The sheath layer is made of cross-linked polyethylene with a thickness of 4.0~4.8 mm.