Dual-seal large-deflection compensating joint

Abstract

The invention discloses a dual-seal large-deflection compensating joint which comprises two spool flanges connected with a pipeline, wherein the excircles of the two pipe nipple flanges are respectively provided with a gland through a connecting bolt and a connecting nut; the glands are provided with sealing strips, and a slide pipe is connected between the two glands through a check ring; the end faces of the pipe nipple flanges are provided with limited blocks matched with the check ring; a cavity formed by the glands, the pipe nipple flanges and the check ring is internally provided with a U-shaped sealing ring; and an O-shaped sealing ring is arranged at the lip part of the U-shaped sealing ring, and the inner cavities of the two pipe nipple flanges are respectively provided with a corrugation rubber pipe. The dual-seal large-deflection compensating joint not only has good seal effect, but also can compensate larger deflection angles and decentration.

Description

technical field [0001] The invention relates to a pipeline joint, and in particular to a double-seal large-deflection compensation joint. Background technique [0002] At present, various pipeline systems such as: gas pipelines, water supply pipelines, oil pipelines, etc. are widely used in people's daily life. Pipeline deflection and thermal expansion and contraction caused by complex terrain, seasonal changes, and large temperature differences between day and night will have a serious impact on the pipeline, so a compensator must be installed on the pipeline to compensate for the axial displacement and deflection angle eccentricity of the pipeline. Existing compensators mainly include square compensators, packing sleeve type compensating joints, wave compensators, L-type compensators, Z-type compensators and flexible pipe compensators. Square compensators are durable, reliable in operation but consume a lot of materials , covers a large area, and it takes man-hours to man...

AI Technical Summary

Problems solved by technology

[0002] At present, various pipeline systems such as: gas pipelines, water supply pipelines, oil pipelines, etc. are widely used in people's daily life. Pipeline deflection and thermal expansion and contraction caused by complex terrain, seasonal changes, and large temperature differences between day and night will have a serious impact on the pipeline, so a compensator must be installed on the pipeline to compensate for the axial displacement and deflection angle eccentricity of the pipeline. Existing compensators mainly include square compensators, packing sleeve type compensating joints, wave compensators, L-type compensators, Z-type compensators and flexible pipe compensators. Square compensators are durable, reliable in operation but consume a lot of materials , covers a large area, and it takes man-hours to manufacture a large-diameter square compensator, so it is suitable for small-diameter, high-pressure pipelines; the packing sleeve type compensation joint has a compact structure and a small footprint, but due to the poor resilience of the packing, it is easy to form Drip, frequent maintenance and replacement of packing are required; the wave compensator has compact structure, good sealing performance, high temperature resistance and corrosion resistance, but its compensation amount is small; Cover loose sleeve compensation joint and flange loose sleeve compensation joint have reasonable structure and reliable sealing performance. After connection, they can compensate radial displacement, deflection angle and eccentricity within a certain range. The amount of compensation is small (flexibility: 2~3°; eccentricity: 2~5mm)

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