Steel-plastic composite tube connecting structure based on orifice flangings

Abstract

The invention discloses a steel-plastic composite tube connecting structure based on orifice flanging. The connecting structure comprises two pipelines to be connected, a bush and two flanges, wherein the two pipelines are coaxially arranged and orifices of the pipelines are opposite, two ends of the bush are respectively inserted in the orifices of the two pipelines, the flanges are respectively sleeved on the two pipelines and are connected through a bolt, the orifices of the pipelines are provided with flangings extending outwards along the radial direction of the pipelines, the middle part of the bush is provided with an annular protruding edge along the circumferential direction, the flangings on the orifices of the two pipelines abut against the annular protruding edge of the bush from the both sides, and the two flanges respectively compact the flangings on the orifices of the two pipelines from the outside to the inside. The connecting structure can use the orifice flangings as a point of strength for connection and a sealing surface, thus the connection is convenient, the pullout force resistance is strong and the sealing performance is reliable.

Description

technical field [0001] The invention relates to a pipe connection structure, in particular to a steel-plastic composite pipe connection structure. Background technique [0002] Steel-plastic composite pipe is a new type of composite pipe, which has the advantages of strong pressure bearing capacity, good corrosion resistance, and small linear expansion coefficient. At present, it has been more and more used in oil and gas transportation, industrial and mining pipes, Drinking water pipes, drainage pipes and other fields. [0003] The existing steel-plastic composite pipes are all straight pipe structures, and the steel-plastic composite pipes of the straight pipe structure have a variety of connection structures when performing quick and sealed connections, such as internal expansion connection structures, hoop connection structures, etc., among which, the inner The expansion connection structure requires the use of special internal expansion tooling to process the internal...

AI Technical Summary

Problems solved by technology

[0003] The existing steel-plastic composite pipes are all straight pipe structures, and the steel-plastic composite pipes of the straight pipe structure have a variety of connection structures when performing quick and sealed connections, such as internal expansion connection structures, hoop connection structures, etc., among which, the inner The expansion connection structure requires the use of special internal expansion tooling to process the internal expansion of the pipe fittings during the connection process. The connection process is complicated and the implementation cost is high. When the pulling force on the pipeline is large, the internal expansion of the pipeline is easy to occur. Recovery deformation leads to pull-out; while the hoop-type connection structure generally has problems such as weak pull-out force, which cannot well meet the use requirements

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