Plastic pipeline expansion piece

Abstract

The invention discloses a plastic pipeline expansion piece belonging to the technical field of pipeline compensation devices. The plastic pipeline expansion piece includes a core pipe, an outer connecting sleeve B, a convex outer ring of the outer connecting sleeve B, a plunger piston inner pipe framework, a plunger piston inner pipe, and a ring seal framework, which are all connected into an integrative structure, wherein the plunger piston inner pipe is provided with a convex outer ring of the plunger piston inner pipe, and the ring seal framework is provided with an O-type seal ring A and an O-type seal ring B. When one end of the core pipe is subjected to pushing of axial thermal expansion force, the outer connecting sleeve B, the core pipe, the plunger piston inner pipe provided with the convex outer ring of the plunger piston inner pipe and connected on the plunger piston inner pipe framework, and the ring seal framework provided with the O-type seal ring A and the O-type seal ring B can move wholly, coaxially and synchronously in the axial direction through the convex outer ring of the outer connecting sleeve B which is propped against a corrugated pipe capable of deformation by self-flexibility. Through adopting the structure, the plastic pipeline expansion piece has multifunctional characteristics of reducing pipeline stress, enhancing sealing performance, improving loading capacity, having corrosion protection efficacy, and realizing large compensation dosage and broad application range.

Description

Technical field [0001] The invention relates to an expander for plastic pipelines, belonging to the technical field of pipeline compensation devices, in particular to the technical field of industrial pipeline compensation device structures used in petrochemical, light industry, electric power, municipal and other industries; especially power plant energy-saving transformation (Plastic pipes for condensate recycling) further promoted the application and development of buried plastic pipes. Background technique [0002] There are several common compensation methods for plastic pipes in the prior art: 1. Traditional natural U-shaped bend, 2. Non-metallic compensator, etc. Among them: the natural U-shaped bend compensation method has a relatively large pressure loss, especially in buried pipelines; the use of ordinary non-metallic compensators always have problems such as running, emitting, dripping, and leakage when the pipeline is running; using ordinary The structure and sealing...

AI Technical Summary

Problems solved by technology

Among them: the pressure loss of the natural U-shaped bend compensation method is relatively large, especially not suitable for buried pipelines; there are always problems such as running, popping, dripping, and leaking when using ordinary non-metallic compensators during pipeline operation; using ordinary compensators The structure and sealing performance of the sleeve-type compensator are not good, the leakage phenomenon is serious, and the anti-corrosion link is relatively weak; especially the common non-metallic compensator and the common sleeve-type Sealing form, in use: fluid medium and pressure bearing capacity are subject to certain limitations

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