A kind of anti-low temperature sheath suitable for underground buried cables

Abstract

The invention discloses a low-temperature-resistant sheath suitable for buried cables, which belongs to the technical field of cable sheaths. The inner sheath and the outer sheath protect the cables. Under normal circumstances, the inner and outer sheaths In the stretched state, the heat conduction layer inside the inner sheath plays a role in cooling the cable, and in the low temperature environment, the elastic stretching surface layer and the connecting stretching column that cooperate with each other shrink strongly when cold, driving the elastic cable that has the ability to shrink itself. The antifreeze layer shrinks inward, and the outer wall of the outer sheath forms a wrinkled shape, which effectively enhances the antifreeze ability of the outer sheath, and at the same time can crack the ice layer attached to the sheath. In addition, when the elastic antifreeze layer is inward After shrinking, the connecting telescopic column is close to the magnetic heat insulation surface layer, and has a repelling effect on the magnetic heat insulation surface layer, so that the magnetic heat insulation surface layer is repelled and reaches a relaxed state and covers the outer wall of the outer connecting layer, which plays a very good role. Heat insulation, effectively realizing that the cold environment outside the sheath is not easy to affect the cable.

Description

technical field [0001] The invention relates to the technical field of cable sheaths, in particular to a low-temperature resistant sheath suitable for buried cables. Background technique [0002] In power construction, it is necessary to bury cables to ensure long-distance power transmission and ensure power supply. The cables are made of one or more mutually insulated conductors and an outer insulating layer to transmit power or information from one place to another. wire to another location. [0003] Cables buried underground for a long time need to have anti-crack performance, especially for some severe cold areas, where the underground soil is prone to cracking due to too low temperature. When the soil is frozen and cracked in a large area, it is easy to damage the cables buried under the soil. When the cable is severely squeezed, the probability of cracking will be aggravated. When the cable sheath is cracked, the water vapor, dirt and outside air in the soil can easil...

AI Technical Summary

Problems solved by technology

[0003] Cables buried underground for a long time need to have anti-crack performance, especially for some severe cold areas, where the underground soil is prone to cracking due to too low temperature. When the soil is frozen and cracked in a large area, it is easy to damage the cables buried under the soil. When the cable is severely squeezed, the probability of cracking will be aggravated. When the cable sheath is cracked, the water vapor, dirt and outside air in the soil can easily enter from the cracks in the sheath. Inside the sheath, the core wire and protective layer made of conductors are damaged, which may easily reduce the transmission efficiency, and may also cause damage to the cable and cause potential safety hazards; It is easy to form a layer of ice on the outer wall of the cable, which is not conducive to the anti-freezing of the cable

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