Electromagnetic induction heating type steel-plastic composite pipeline full fusion welding structure

Abstract

The invention discloses an electromagnetic induction full heating type steel-plastic composite pipeline connecting structure. The connecting structure comprises a wave-shaped lining ring, a pure plastic pipe fitting, and a steel-plastic composite pipe material with an inner plastic pipe layer, wherein the pure plastic pipe fitting is provided with an outer ring part, an annular bearing and inserting cavity, an inner ring body segment and an inner ring expanding segment; the steel-plastic composite pipe material is inserted into the annular bearing and inserting cavity; a transition step is formed by the inner ring body segment and the inner ring expanding segment; an electromagnetic induction coil wrapped at the outer ring part is used for the fusion welding of the steel-plastic composite pipe material and the pure plastic pipe fitting; the free end of the lining ring leaned against the inner wall of an inner ring part is positioned outside the end part of the inner ring expanding segment; a gap exists between the free end of the lining ring and the inner wall of the adjacent inner plastic pipe layer; fused plastic accumulated in a fused material placing space carries out the fusion welding for the end part of the inner ring expanding segment and the inner wall of the steel-plastic composite pipe material together in a sealing manner after being condensated; and the sum of the wall thickness of the inner ring expanding segment and the wall thickness of the inner plastic pipe layer is from 3mm to 20mm. According to the invention, reliable and gapless fusion welding in a tight sealing manner can be formed between the steel-plastic composite pipe material and the inner ring part, so that the seepage phenomenon between the steel-plastic composite pipe material and the inner ring part is avoided.

Description

【Technical field】 [0001] The invention relates to a welding structure of an electromagnetic induction heating type steel-plastic composite pipeline, in particular to a fully welding structure of an electromagnetic induction heating type steel-plastic composite pipeline, which belongs to the technical field of pipeline welding. 【Background technique】 [0002] In the construction of pipeline engineering, especially in the construction of pipeline networks for water supply and gas supply, people are increasingly using steel-plastic composite pipes based on steel pipes, and pure plastic pipe fittings are used between steel-plastic composite pipes The electromagnetic fusion connection forms the pipeline. The steel-plastic composite pipe integrates high pressure resistance, corrosion resistance and oxygen resistance. This emerging pipe is an upgraded product of the traditional galvanized pipe and thermoplastic pipe. [0003] In the existing technology, it is difficult for the stee...

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Problems solved by technology

[0003] In the existing technology, it is difficult for the steel-plastic composite pipe to form a tight seal with the inner ring of the pure plastic pipe, and there is inevitably a welding gap between the steel-plastic composite pipe and the inner ring of the pure plastic pipe, resulting in leakage. And when the pure plastic pipe fittings are out of round, the welding gap will become larger

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