Full corrosion-resistant connection structure of steel lining plastic composite pipeline

Abstract

The invention discloses a full corrosion-resistant connection structure of a steel lining plastic composite pipeline, and belongs to the technical field of connection of the steel lining plastic composite pipeline. The structure comprises a corrosion-resistant ring sleeved on a non-meshing section of an external thread of a steel outer layer, a steel lining plastic composite pipe fitting consisting of a steel outer ring part and a plastic inner ring part, and a composite pipe consisting of the steel outer layer with the external thread, and a plastic inner layer, wherein the external thread consists of a meshing section and the non-meshing section; an annular cavity of which the inner wall is provided with an internal thread section is formed between the steel outer ring part and the plastic inner ring part; the pipe is in threaded connection with the pipe fitting; a solid hot melt adhesive is arranged in the annular cavity; when an alternating magnetic field is formed at the periphery of the joint of the pipe fitting and the pipe, the solid hot melt adhesive is in thread engagement with the steel outer ring part and in sealed connection with the end faces of the steel outer layer and the plastic inner layer; and the corrosion-resistant ring is in sealed connection with the non-meshing section of the pipe. After the scheme is adopted, the problem that the threads of the pipe and the pipe fitting are easily corroded and rusted is solved, and a full corrosion-resistant threaded connection effect is achieved.

Description

【Technical field】 [0001] The invention relates to a pipeline connection structure, in particular to a fully anti-corrosion connection structure between steel-lined plastic pipes and steel-lined plastic pipe fittings used in water supply, gas supply, heat and other systems, which belongs to the steel-lined plastic composite pipeline connection technology field. 【Background technique】 [0002] Traditional pipes and fittings are mostly iron castings. Among them, the pipe fittings are machined with internal threads and rubber sealing gaskets placed in the pipe fittings, and the ends of the pipes have external threads that can be threaded with pipe fittings. The advantage is that the connection method is simple. Pipes and pipe fittings can be replaced after being corroded and cracked, but cast iron pipe bodies and cast iron pipe fittings are prone to rust and are not durable, so they are gradually replaced by steel-lined plastic composite pipes with threaded connections. The pipe...

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved and the technical task proposed by the present invention are to overcome the defect that the existing steel-lined plastic pipe threads and steel-lined plastic pipe fitting threads are easily corroded by fluids, and provide a fully anti-corrosion connection structure for steel-lined plastic composite pipes

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