Outdoor optical cable with excellent anti-electromagnetic performance

Abstract

The invention discloses an outdoor optical cable with excellent anti-electromagnetic performance, comprising a central reinforcing steel wire. A plurality of cable cores surround the outer side of thecentral reinforcing steel wire, loose sleeves sleeve the outer peripheries of the cable cores, the loose sleeves are filled with fiber paste, the outer sides of the loose sleeves are provided with awaterproof layer, and the outer side of the waterproof layer is sequentially provided with an inner insulating layer, a shielding layer, a braid layer and a first protective layer in sequence; the outer periphery of the first protective layer is wrapped with a galvanized steel wire, and the outer periphery of the galvanized steel wire is provided with a second protective layer; the inner insulating layer is made of a combination of one or more of modified glass fiber, polytetrafluoroethylene, crosslinked ethylene propylene rubber, and polyimide; and the shielding layer adopts a composite shielding material, and the composite shielding material consists of 50 to 60% graphite matrix and 40 to 50% lead alloy. The outdoor optical cable of the present invention has improved water resistance andelectromagnetic resistance compared with the conventional outdoor optical cable, and maintains good electromagnetic resistance even after adsorbing a large amount of water or oil-water mixture.

Description

technical field [0001] The invention relates to the technical field of optical fiber cables, in particular to an outdoor optical cable with excellent electromagnetic resistance performance. Background technique [0002] With the continuous development of social economy, optical communication technology is widely used, and communication optical cables, especially outdoor optical cables, are widely used. Outdoor optical cables have been exposed to the sun, rain and extreme weather all year round, and there is a strong electric field around them. Most of the existing outdoor cable structures use steel wire as the central strength member, and wrap steel sheath or polyethylene sheath outside the cable core, which has the following disadvantages: the oxidation of phosphating steel wire or steel-aluminum strip causes hydrogen damage to the optical fiber, resulting in The loss increases greatly; the perennial sun and rain make the steel wire rust, the polyethylene sheath absorbs wa...

AI Technical Summary

Problems solved by technology

Most of the existing outdoor cable structures use steel wire as the central strength member, and wrap steel sheath or polyethylene sheath outside the cable core, which has the following disadvantages: the oxidation of phosphating steel wire or steel-aluminum strip causes hydrogen damage to the optical fiber, resulting in The loss increases greatly; the perennial sun and rain make the steel wire rust, the polyethylene sheath absorbs water and oil and swells, and the waterproof performance, electrical insulation and anti-electromagnetic shielding performance of the optical cable are greatly reduced

[0003] The Chinese invention patent with the application number 201010122474.5 discloses a strong anti-electromagnetic field optical cable, by coating the first protective sheath on the periphery of the loose tube, wrapping the outer periphery of the protective sheath with galvanized steel wire, and wrapping the second protective sheath on the outer periphery of the galvanized steel wire. The optical cable has good weather resistance, temperature resistance, tensile strength, and impact strength, but the first protective sleeve and the second protective sleeve will greatly reduce the waterproof performance and electromagnetic resistance of the optical cable after oxidation or water absorption. Improve

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