Expansion joint used for high temperature and high pressure pipeline

Abstract

The invention discloses an expansion joint used for a high temperature and high pressure pipeline. The expansion joint comprises an inner casing pipe and an outer casing pipe which can axially move relative to each other. The outer wall of the inner casing pipe is limited by a sliding ring arranged on the inner wall of the outer casing pipe. A gap among the inner casing pipe, the outer casing pipe and the sliding ring forms a sealed area, and the sealed area is sealed by filler. An opening in the side, opposite to the sliding ring, of the sealed area is a filler port. A circle of compression boss matched with the filler port in shape and size is arranged on the outer side of the inner casing pipe. The compression boss and the filler port are each provided with a flange perpendicular to the axial direction. The two flanges are connected through a plurality of sliding rods. The sliding rods and the sliding ring limit the relative movement of the inner casing pipe and the outer casing pipe in the axial direction together. The expansion joint has the beneficial effects that 1, the expansion joint is resistant to corrosion, high temperature and low temperature; 2, through the casing pipe type structural design, the expansion joint is light, small in size and convenient to install; 3, the problem that during long-distance pipeline installation, pipelines expand by heat and contract by cold when temperature changes is solved.

Description

technical field [0001] The invention relates to an expansion joint, in particular to an expansion joint for high-temperature and high-pressure pipelines. Background technique [0002] The expansion joint is a flexible structure arranged on the container shell or pipeline to compensate for the additional stress caused by temperature difference and mechanical vibration. As an elastic compensating element that can expand freely, it has the advantages of reliable operation, good performance, and compact structure, and has been widely used in chemical industry, metallurgy, nuclear energy and other departments. [0003] Expansion joints are also customarily called compensators, or expansion joints. It consists of a bellows (an elastic element) that constitutes its main body and accessories such as end pipes, brackets, flanges, and conduits. The expansion joint is a flexible structure arranged on the container shell or pipeline in order to compensate the additional stress caused ...

AI Technical Summary

Problems solved by technology

However, the disadvantages of U-shaped expansion joints are that they take up a lot of space, consume a lot of steel and have high frictional resistance.

The disadvantage of the bellows expansion joint is that the service life is short, and the temperature and pressure are not very high, and the length of the pipeline is short.

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