Multi-layer corrugated pipe and connecting pipe connecting structure and connecting method of connecting structure

Abstract

The invention relates to a multi-layer corrugated pipe and connecting pipe connecting structure and a connecting method of the connecting structure. Two or more layers of corrugated pipes are included. The corrugated pipes are connected with a connecting pipe through straight edge sections at the end portions in an outer sleeving or inner inserting manner, each layer of step-shaped straight edge section is sequentially welded to the connecting pipe, and after each layer is welded, a welding line is subjected to PT and kerosene leakage detection, and accordingly the integral high welding strength of a welding connector is achieved. The multi-layer corrugated pipe and connecting pipe connecting structure and the connecting method of the connecting structure solve the problems that in the prior art, welding lines are not firm, and leakage is generated after usage is conducted for a period of time; operation is simple, the pipe fitting connecting sealing performance is good, the service life is long, and the integral quality of multi-layer corrugated pipe and connecting pipe welding and connecting is greatly improved.

Description

technical field [0001] The invention relates to the technical field of connection between corrugated pipes and connecting pipes, in particular to a connection structure and method for connecting multilayer corrugated pipes and connecting pipes. Background technique [0002] Bellows is a pipe shaped like a regular wave. It produces displacement under the action of pressure, axial force, lateral force or bending moment. It is often used as a shock absorbing element, compensating element and sealing element in various industries. , which is also used as a connecting joint between two parts. Corrugated pipes can be divided into metal bellows and non-metallic bellows according to the constituent materials, and can be divided into single-layer and multi-layer according to the structure. Multi-layer bellows has high strength, high pressure resistance, small rigidity and large displacement, and is often used in the manufacture of metal expansion joints and non-leakage valves. The ...

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Problems solved by technology

[0003] In the prior art, the multilayer corrugated pipe in the pipeline expansion joint is first sealed with argon arc welding or resistance welding, and then the multilayer corrugated pipe after edge sealing is welded with the connecting pipe. Under the existing mature detection means, the welding is completed The final weld can only be tested for PT and kerosene leakage, but no matter whether PT or kerosene leak detection is used, it can only ensure that the outer surface of the final weld is intact, and the connection status of the inner layer cannot be known; after a period of use Finally, the weld may leak under the conditions of corrosion, displacement and vibration, resulting in failure of the expansion joint

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