CN201773626U - High and low temperature resistant, composite insulated flexible symmetrical cable - Google Patents

Abstract

The utility model relates to a high and low temperature-resistant composite insulated flexible symmetrical cable, which comprises insulated conductors consisting of a polytetrafluoroethylene insulating layer outside an inner conductor, and also comprises filling cores molded by a microporous polytetrafluoroethylene film tape, a polyimide film tape isolated layer, a silver plated copper wire braided layer and a PFA sheath, wherein two insulated conductors and two filling cores molded by the microporous polytetrafluoroethylene film tape are stranded, and then are coated with the polyimide film tape isolated layer, the silver plated copper wire braided layer and the PFA sheath in turn. The utility model has the characteristics that: the cable has small DC resistance, excellent electrical property at high frequency, light weight, small dielectric constant, low attenuation, high flexibility and excellent radiation resistance, and ensures the low attenuation performance of a lead at high frequency; and the flexibility is improved by adopting a multi-strand braiding form.

Description

High and low temperature resistant, composite insulated flexible symmetrical cable

technical field

The utility model relates to a cable, in particular to a high and low temperature resistant composite insulating soft symmetrical cable which is suitable for signal transmission inside equipment such as aircrafts and spacecraft, has bidirectional output characteristics, high real-time performance and high reliability.

Background technique

Ordinary symmetrical cables generally use a single material as insulation, which has a large attenuation at high frequencies, which is not conducive to use, and has poor chemical resistance, and the use environment is limited.

Contents of the invention

In view of the deficiencies in the prior art, the utility model provides a high and low temperature resistant, composite insulating soft and symmetrical cable.

In order to achieve the above purpose, the utility model adopts the following scheme: a kind of high and low temperature resistant, composite insulated flexible symmetrical cable, which is characterized in that it includes an insulated wire core composed of a polytetrafluoroethylene insulating layer outside the inner conductor, It also includes the filling core formed by microporous polytetrafluoroethylene film tape, polyimide film tape isolation layer, silver-plated copper wire braiding layer and PFA sheath, the two insulated wire cores and the two microporous polytetrafluoroethylene The filled core formed by tetrafluoroethylene film is twisted, and a layer of polyimide film isolating layer, silver-plated copper wire braiding layer, and PFA sheath are arranged outside it in sequence.

The utility model is characterized in that: the inner conductor is a silver-plated copper conductor with excellent electrical performance, small DC resistance, excellent electrical performance under high frequency, easier to weld than ordinary copper conductors and tinned copper conductors, lower resistance, and higher temperature resistance. The insulating layer is polytetrafluoroethylene, which adopts thin-layer extrusion process, which not only ensures excellent electrical insulation performance, but also reduces weight. The filling core is made of a microporous polytetrafluoroethylene film tape with a low dielectric constant and low density. The addition of the filling core makes the cable structure stable and can meet the requirements of its electrical properties such as impedance, capacitance and attenuation. It has small dielectric constant, low attenuation, light weight and good flexibility. The isolation layer is made of polyimide film tape, which has excellent radiation resistance. Composite insulation composed of polytetrafluoroethylene insulating layer, microporous polytetrafluoroethylene filling core and polyimide film belt isolation layer not only ensures high and low temperature resistance of the wire, small outer diameter, low density, radiation resistance, Good flexibility, matching design of impedance, capacitance and system, and ensure the low attenuation performance of the wire at high frequency. The braiding layer is made of high-temperature-resistant silver-plated copper wire, which not only reduces the influence of external interference at high frequencies, but also uses multi-strand braiding to increase flexibility. The sheath is PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer), which has high and low temperature resistance, good flame retardancy, and excellent chemical resistance. The thin-layer extrusion process ensures excellent electrical insulation performance, and reduced weight.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Detailed ways

As shown in Figure 1, the high and low temperature resistant, composite insulated flexible symmetrical cable includes an insulated wire core 1 composed of a polytetrafluoroethylene insulating layer 1-2 outside the inner conductor 1-1, and also includes a microporous polytetrafluoroethylene Formed filling core 2 with vinyl film, isolation layer 3 with polyimide film, braided layer 4 of silver-plated copper wire and PFA sheath 5 .

The inner conductor 1-1 is made of silver-plated copper conductor, the insulating layer 1-2 is made of extruded polytetrafluoroethylene thin layer, and the filling core 2 is formed by wrapping with microporous polytetrafluoroethylene film tape. The inner conductor 1-1 and the insulating layer 1-2 constitute the insulated wire core 1, and the two insulated wire cores 1 and the two filled cores 2 formed by the microporous polytetrafluoroethylene film strips are twisted and then sequentially Wrap a layer of polyimide film with an isolation layer 3, braid a layer of silver-plated copper wire braid 4, and finally extrude a layer of PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) sheath 5.

Claims (1)

1. A high and low temperature resistant, composite insulated flexible symmetrical cable, characterized in that it includes an insulated core (1) composed of a polytetrafluoroethylene insulating layer (1-2) outside the inner conductor (1-1) , also includes a microporous polytetrafluoroethylene film tape forming filling core (2), polyimide film tape isolation layer (3), silver-plated copper wire braiding layer (4) and PFA sheath (5), two The insulated wire core (1) and the filling cores (2) formed by two microporous polytetrafluoroethylene film tapes are stranded, and one layer of polyimide film tape isolation layer (3), Silver-plated copper wire braid (4) and PFA sheath (5).

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