Connecting device for polymer pipeline and metal joint

Abstract

The invention provides a connecting device for a polymer pipeline and a metal joint. The connecting device is characterized in that the outer peripheral face of the metal joint contacts with the inner wall of the polymer pipeline, the outer surface of the polymer pipeline contacts with the inner peripheral face of a contraction ring, the outer peripheral face of the contraction ring contacts with the inner peripheral face of a compression ring, a positioning shoulder is arranged at one end of the metal joint, an annular groove A and an annular groove B are formed in the outer peripheral face of the metal joint, contraction grooves in axial distribution are formed in the outer peripheral face of the contraction ring, an annular protrusion A is arranged on the outer peripheral face of the contraction ring, an annular groove C is formed in the inner peripheral face of the compression ring, and an intersecting line of the annular groove C and the inner peripheral face of the compression ring is provided with an chamfer. The connecting device has the advantages that the connecting device has good sealing effect, does not cause damage to the inner wall of the polymer pipeline, is reliable in connection, has a quite wide commercial prospect, can fill in related technical blanks and can generate high social and economic benefits.

Description

technical field [0001] The invention relates to the field of pipeline connectors, in particular to a connecting device for polymer pipelines and metal joints. Background technique [0002] Pipe connection technology and devices are widely used in people's daily life and industrial fields. Among them, the connection technology between polymer pipes and metal joints is difficult, and the sealing effect is not ideal. At present, the following two methods are commonly used to realize the connection of polymer pipes and metal joints. [0003] The first type is composed of metal joints, rubber sealing rings, split crimping rings, and fastening bolts, nuts and gaskets. The outer circumferential surface of the metal joint inserted into the polymer pipe has several annular anti-falling barbs and annular grooves for placing rubber sealing rings. The metal joint with the sealing ring installed is inserted into one end of the polymer pipe, and the opening withholding ring is installed...

AI Technical Summary

Problems solved by technology

When the hydraulic clamping is released, the buckle ring has a slight rebound, resulting in a decrease in the contact pressure between the inner circumferential surface of the polymer pipe and the metal joint, and the metal joint cannot prevent rotation when subjected to a large torque

Due to the large size of the hydraulic device, it must be pre-tightened at the factory, so the scope of application is limited

[0005] In the above two methods, there are barbs on the metal joints. After the buckle ring is fastened, the barbs are embedded in the inner wall of the polymer pipe, and excessive compression deformation and tensile deformation are locally generated on the inner circumferential surface of the polymer pipe, which affects the polymerization. service life of the pipeline

[0006] In order to solve technical bottlenecks such as easy leakage, poor sealing effect, and damage to polymer pipelines in the current prior art pipeline connection, the present invention proposes a connection device for polymer pipelines and metal joints, which has a low cost and a simple solution Novel and unique, it can not only ensure the tightness of the pipeline connection, but also has a wide range of applications without damaging the inner wall of the polymer pipeline, greatly prolonging the service life of the polymer pipeline, meeting the actual needs of the pipeline connection in the industrial field, filling the gaps in related technologies, and Generate greater social and economic benefits

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