Super-light aerospace data bus cable structure and preparation method

Abstract

The invention discloses a super-light aerospace data bus cable structure which comprises two twinning insulated cores twisting rightwards, a composite belt layer wrapping the twinning insulated cores,a braided shielding layer arranged outside the composite belt layer, and a sheath layer arranged outside the braided shielding layer. The composite belt layer comprises one polyimide / aluminum composite belt layer which is leftwards wrapped, and the aluminum side is outward; the braided shielding layer is formed by braiding silvered cooper-aluminum alloy wires; and a sheath of the sheath layer includes a crosslinked ethylene-tetrafluoroethene copolymer layer. The cable structure is resistant to oxidation and high / low temperature and low in loss, a silvered copper conductor is used, the transmission attenuation and signal loss are low, data transmission is fast, the antioxidation capability of the conductor is enhanced, and the cable structure can be applied to extreme environment of low temperature of -65 DEG C and high temperature of +200 DEG C.

Description

technical field [0001] The invention relates to the technical fields of data bus and aerospace, in particular to an ultra-light data bus cable structure and preparation method for aerospace. Background technique [0002] At present, common data bus cables have the following problems: First, polyfluoroethylene propylene is used as insulation, and polyfluoroethylene propylene has a high density (2.17g / cm3), resulting in heavy product weight and reducing the carrying capacity of the aircraft ; Second, cross-linked ethylene-tetrafluoroethylene copolymer is used as insulation. Although the density of cross-linked ethylene-tetrafluoroethylene copolymer is slightly lower (1.76g / cm3), its dielectric constant is relatively large (2.5~2.7 ), which increases the attenuation of the product and reduces the data transmission performance of the product; third, products that are insulated by polyperfluoroethylene propylene have no anti-radiation characteristics; fourth, the shielding layer ...

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Problems solved by technology

[0002] At present, common data bus cables have the following problems: First, polyfluoroethylene propylene is used as insulation, and polyfluoroethylene propylene has a high density (2.17g / cm3), resulting in heavy product weight and reducing the carrying capacity of the aircraft ; Second, cross-linked ethylene-tetrafluoroethylene copolymer is used as insulation. Although the density of cross-linked ethylene-tetrafluoroethylene copolymer is slightly lower (1.76g / cm3), its dielectric constant is relatively large (2.5~2.7 ), which increases the attenuation of the product and reduces the data transmission performance of the product; third, products that are insulated by polyperfluoroethylene propylene have no anti-radiation characteristics; fourth, the shielding layer of ordinary products has a large proportion ( 8.89g / cm3) tinned copper wire or silver-plated copper wire braided shielding, resulting in heavy product weight and reducing the carrying capacity of the aircraft

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