Steel-plastic meshed composite pipe with detachment preventive function

Abstract

The invention discloses a steel-plastic meshed composite pipe with a detachment preventive function. The steel-plastic meshed composite pipe comprises a steel outer pipe, an anti-corrosion inner-layer pipe and a connecting flange, two ends of the anti-corrosion inner-layer pipe form end face turnups on a docking face of the connecting flange by means of hot melting deformation, axial meshing structures are arranged between the end face turnups and the connecting flange, and a radial meshing structure is arranged between the anti-corrosion inner-layer pipe and an inner hole of the connecting flange. When environment temperature changes greatly, although a plastic inner pipe deforms greatly due to heat expansion and cold contraction, two ends of the anti-corrosion inner-layer pipe are limited by the axial meshing structures of the connecting flange and cannot extend outwards, deformation due to heat expansion and cold contraction of the anti-corrosion inner-layer pipe is converted into internal stress, and compactness of the anti-corrosion inner-layer pipe and improvement on mechanical performance of the same are facilitated, so that displacement, degumming and detachment defects between the anti-corrosion inner-layer pipe and the steel outer pipe are eliminated structurally.

Description

technical field [0001] The invention relates to a steel-plastic composite pipe used for underground fluid transportation. Background technique [0002] The steel-plastic composite pipe is a composite pipe body formed by using carbon steel pipe as the base pipe body and coating a layer of plastic with good corrosion resistance on the inner surface of the steel body. It has both the bearing strength of the steel pipe body and the The corrosion resistance of the plastic pipe body makes it necessary to use this kind of steel-plastic composite pipe in all kinds of liquid pipelines under pressure, especially the underground high-pressure liquid and gas pipelines are inseparable from the steel-plastic composite pipe. [0003] According to the working condition requirements of the steel-plastic composite pipe in actual use, the plastic coating layer coated on the inner and outer walls of the steel pipe body must be closely integrated with the steel pipe body, and there should be no ...

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Problems solved by technology

[0004] Steel-plastic composite pipes of this structure are produced at room temperature or stored for a short period of time at room temperature, and the expansion defects of the plastic inner layer or plastic inner pipe are not easy to be found. When transporting liquids with a large temperature difference, it is very easy to cause the plastic pipe and the steel pipe to flow, degumming and barge, and in severe cases, the plastic coating or the pipe body will be broken, and the steel-plastic composite pipe body will lose its proper anti-corrosion performance.

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