A symmetrical stranded wire

Abstract

The invention relates to the technical field of communication wire rods, in particular to a symmetrically twisted wire rod. The symmetrically twisted wire rod comprises a flexible transparent tube and four conductor wire cores positioned inside the transparent tube, wherein the first wire core, the second wire core, the third wire core and the fourth wire core are uniformly arranged; any one of intersection points of the first wire core and the third wire core is positioned between the second wire core and the fourth wire core respectively; and any one of intersection points of the second wire core and the fourth wire core is positioned between the first wire core and the third wire core respectively. Any two of the four conductor wire cores are twisted with each other respectively, and a single conductor wire core is prevented from being broken by relatively high continuous stress caused by non-uniform stress of the wire rod in the bending process of the wire rod, so that the problem that the whole wire rod is scraped due to the fact that the single conductor wire is broken is effectively avoided, and the structure of the wire rod is more stable and reliable; the outer layer of the symmetrically twisted wire rod is of a transparent structure, the appearance viewing value of the wire rod is strengthened, and the symmetrically twisted wire rod has preferable electric property under a high-frequency transmission condition and is high in practicability.

Description

technical field [0001] The invention relates to the technical field of communication wires, in particular to a symmetrical twisted wire. Background technique [0002] Power cables and communication cables are the second pillar products of China's export products. A large cable is made up of many or many pairs of small twisted wires twisted at a certain helical distance. The twisted wires in the prior art , each pair of twisted wires is made up of two core wire groups. The core wire groups include conductors and insulation layers covering the outer sides of the conductors. The high performance of data cables is related to three important parameters: impedance, attenuation It is related to the crosstalk index. The characteristic impedance of the cable is mainly affected by the dielectric constant of the material around the conductor, the insulating layer and the outer diameter of the conductor itself, and is also affected by the number of twists per unit length. The actual imp...

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Problems solved by technology

[0002] Power cables and communication cables are the second pillar products of China's export products. A large cable is formed by twisting multiple or multiple pairs of small twisted wires at a certain helical distance. The twisted wires in the prior art , each pair of twisted wires is made up of two core wire groups. The core wire groups include conductors and insulation layers covering the outer sides of the conductors. The high performance of data cables is related to three important parameters: impedance, attenuation It is related to the crosstalk index. The characteristic impedance of the cable is mainly affected by the dielectric constant of the material around the conductor, the insulating layer and the outer diameter of the conductor itself, and is also affected by the number of twists per unit length. The actual impedance of the cable To a large extent, it is related to the outer diameter of the conductor, the mutual positional relationship between the core wire groups, and the distance between the conductors. In the prior art, the cable structure is not only thick with the copper wire of the inner conductor, so that the production materials are not only wasteful, but also cause The deterioration of indicators such as impedance, attenuation, and crosstalk seriously restricts the improvement of the operating frequency and data transmission speed of data cables, so it is necessary to improve the existing cable structure

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