Flexible composite connection pipe fitting for large-aperture plastic pipeline

Abstract

The invention provides a flexible composite connection pipe fitting for a large-aperture plastic pipeline in order to solve the problem of connection of a large-aperture poly vinyl chloride (PVC) pipeline. The technical scheme is that: the flexible composite connection pipe fitting for the large-aperture plastic pipeline comprises a poly ethylene (PE) inner layer pipe section and a PVC outer layer pipe section, which is wrapped on the outer surface of the PE inner layer pipe section; on one side, the PVC outer layer pipe section and the PE inner layer pipe section are fused integrally so as to form a flaring; and on the other side, the PE inner layer pipe section is exposed out of the PVC outer layer pipe section. The flexible composite connection pipe fitting for the large-aperture plastic pipeline has the characteristics that: 1, the flexible composite connection pipe fitting is convenient to construct and can be installed and operated easily and feasibly; 2, the tensile compressive strength of the pipe fitting is high; and the PVC outer layer pipe section can fixedly support the PE pipe and effectively avoid the problem of damage to the sealing performance caused by axial movement due to extension and retraction of the PE pipe fitting; 3, the sealing is reliable, so the sealing ring can simultaneously guarantee axial sealing and radial sealing; and the sealing ring is convenient to install; and 4, the flexible composite connection pipe fitting has corrosion resistance performance and long service life. The flexible composite connection pipe fitting can be widely applied to connection of various plastic pipes.

Description

technical field [0001] The invention relates to a special fitting for water supply and drainage pipes, in particular to a flexible composite connecting pipe fitting for large-diameter plastic pipes, belonging to the technical field of water supply and drainage. Background technique [0002] In recent years, the development of plastic pipes has been rapid, and the application volume has increased year by year. In comparison, the equipment and components in the construction and maintenance of pipes are relatively lagging behind, especially the connection of large-diameter PVC pipes and the connection between PVC and PE pipes. The wide application of plastic pipes in the field of water supply has become increasingly prominent. At present, the connection between large-diameter PVC water supply pipes mainly adopts FRP composite pipe fittings or metal pipe fittings. FRP composite pipe fittings are manufactured by hot air welding technology, and there are potential safety hazards ...

AI Technical Summary

Problems solved by technology

FRP composite pipe fittings are manufactured by hot air welding technology, and there are safety hazards such as weak solder joint connection and easy cracking at the joint between FRP composite parts and PVC pipes; cast iron metal pipe fittings used for large-diameter PVC water supply pipe connections are not only heavy, but also take a long time Easy to corrode and rust, causing water leakage accidents

Metal pipe fittings need to be connected by mechanical flange connection. There are many bolts, and it is difficult to adjust the alignment of the flange screw holes on both sides. In addition, the radial corresponding bolts must be tightened synchronously, which is inconvenient to operate, especially due to the change of ambient temperature. Pipes and connecting bolts expand with heat and contract with cold, which can easily cause the bolts to loosen, resulting in leakage at the joint. Not only is the flexibility not good, but the sealing performance is not guaranteed

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