Double-layer expansion pipe

Abstract

The invention relates to the technical field of pipelines, in particular to a double-layer expansion pipe which comprises a hard outer pipe sleeve and an inner layer pipe formed by compounding multiple layers. The two ends of the inner-layer pipe are each provided with a baffle ring, and the outer pipe sleeve is arranged at the exterior of the the inner layer pipe, and located between the two baffle rings. The outer pipe sleeve comprises an elastic connecting piece, a sliding sleeve and two symmetrical half sleeves. The double-layer expansion pipe has the beneficial effects that the outer pipe sleeve has high corrosion resistance and hardness, the inner layer pipe can be prevented from being corroded, and external pressure can be evenly applied to the surface of the inner layer pipe; the situation that the inner layer pipe is broken due to inconsistent internal and external pressure intensity of a local area is avoided; the internal pressure of the inner layer pipe can be adjusted through deformation, and when the inner layer pipe is expanded, the inner diameter of the outer layer pipe can be adaptively increased, so that the balance of the internal pressure and the external pressure is realized, and the inner layer pipe is prevented from being broken; and the expansion degree between the two half sleeves can be limited through the sliding sleeve, and the situation that the inner layer pipe is broken due to excessive deformation is avoided.

Description

technical field [0001] The invention relates to the technical field of pipes, in particular to a double-layer expanded pipe. Background technique [0002] Existing pipes are generally laid underground or installed inside buildings, so the pipes often need to bear the pressure from the inside and outside of the pipes during use. [0003] When the temperature of the fluid inside the pipe changes or the ambient temperature changes, the pipe may be deformed due to thermal expansion and contraction, resulting in excessive surface deformation and rupture of the pipe. [0004] Especially for pipes buried in the ground, because the underground environment is more corrosive to the surface of the pipe, the surface strength of the pipe is likely to decrease, and the density of the underground soil is uneven, so the force on the surface of the pipe is uneven. The deformation of the pipe due to temperature makes the pipe more susceptible to rupture. Contents of the invention [0005]...

AI Technical Summary

Problems solved by technology

[0004] Especially for pipes buried in the ground, because the underground environment is more corrosive to the surface of the pipe, the surface strength of the pipe is likely to decrease, and the density of the underground soil is uneven, so the force on the surface of the pipe is uneven. The deformation of the pipe due to temperature makes the pipe more prone to rupture

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