Self-sealing double-rubber-ring pipeline flexible connector

Abstract

The invention relates to a self-sealing double-rubber-ring pipeline flexible connector which is especially suitable for the connection of large, middle and ultra-large sized liquid medium conveying pipes. The self-sealing double-rubber-ring pipeline flexible connector can be used for avoiding the leakage phenomenon of a traditional pipeline sealing rubber ring caused by the undercut, adhesion andcutting damage and also can be used for solving the leakage problem caused by uneven compression ratio of the sealing rubber ring. The self-sealing double-rubber-ring pipeline flexible connector has a self-sealing function for bearing higher pressure of the pipeline and compensating the rebounding force descending caused by the ageing of the rubber ring in the manner of automatically increasing the compression ratio of the sealing rubber ring. The self-sealing double-rubber-ring pipeline flexible connector is used for thoroughly avoiding the easily occurred leakage phenomenon of the traditional pipeline sealing rubber ring. The sealing capacity of the self-sealing double-rubber-ring pipeline flexible connector can be utilized for bearing a limiting pressure of a pipeline admissible stress, thereby synchronizing the loading capacity and the effective sealing time of the connector with the pressure-bearing limit and the service life of the pipeline. The self-sealing double-rubber-ring pipeline flexible connector is especially suitable for an expanding forming process of the traditional pipeline.

Description

Technical field [0001] The patent of the present invention relates to a pipe, especially a connection interface for large, medium and extra-large liquid medium pipes. Background technique [0002] The pipes that transport liquid media can only work normally with reliable connections, and the flexible interface connection of the rubber ring is the most convenient and commonly used connection method. [0003] Currently known flexible connections of pipe connection interfaces include single and double apron flexible interfaces. Although the connection of the flexible interface of a single rubber ring is simple in structure, it is not possible to perform a pressure test on a single connection interface. Whether the connection of the interface does not leak water should wait for the entire pipe to be filled with water to pressurize the test interface. The quality of the connection. The connection of the flexible interface of the double apron ring Since each connected interface has two...

AI Technical Summary

Problems solved by technology

This structure of installing the rubber ring in the groove of the plug and then pushing it into the socket has many hidden dangers in quality

First, when the apron enters the socket together with the plug, a large friction force will be generated between the outer surface of the apron and the inner hole of the socket, and this friction will bring part of the colloids 7 and 8 of the apron into the socket In the gap 9 and 10 between the head and the plug, the undercut of the apron is damaged. The serious undercut of the apron can make the interface lose the sealing ability immediately. It can withstand a certain pressure during the pressure test, but this damage point will become the stress concentration point of the apron, causing the colloid of the apron to gradually expand and crack until the apron breaks and loses its sealing ability

Second, when the apron enters the socket together with the plug, the outer circle of the apron will adhere to the surface of the inner hole of the socket, causing the apron to be torn and damaged

Third, the sealing ability of the apron is proportional to the rebound force of the apron, and the rebound force of the apron is proportional to the compression ratio of the apron. Because the compression ratio of the apron is too large, it is easy to cause the apron Undercutting, adhesion and tear damage, so the rubber ring compression ratio of this type of interface can only be lower, and cannot be used for high-pressure pipelines

Fourth, the sealing rubber ring of this kind of interface will continuously reduce the rebound force with the aging of the colloid, resulting in an irreversible phenomenon of continuous decline in sealing ability. more serious immediate cause

Fifth, when the installed pipe is removed from the hoisting rope, the weight of the pipe and the backfill soil will not only cut the apron colloid brought into the gap between the plug and the socket, causing damage to the apron, but also make the The uneven gap between the upper and lower rings of the pipe joint makes the compression ratio of the rubber ring ring uneven, resulting in the hidden danger of joint leakage

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