Anti-corrosion rectangular corrugated expansion joint

Abstract

The invention discloses an anti-corrosion rectangular corrugated expansion joint. The anti-corrosion rectangular corrugated expansion joint comprises linear type corrugated pipes I, linear type corrugated pipes II and linear type corrugated pipes III, which have consistent axial section shapes, wherein a rectangular structure is defined by the linear type corrugated pipes I and the linear type corrugated pipes II in an encircling manner; angular cuts, which are formed along the axial direction, are formed in the corresponding linear type corrugated pipes I and the corresponding linear type corrugated pipes II, straight sides on two ends are connected together in a sealed manner so as to form rectangular interfaces, and triangular notches are formed in corrugated pipe sections; angular cuts, which are formed along the axial direction, are formed in the linear type corrugated pipes III and are in welded and sealed connection with the triangular notches formed by the linear type corrugated pipes I and the linear type corrugated pipes II; the further improvements are that an anti-corrosion layer is respectively arranged on the inner walls of the linear type corrugated pipes I, the linear type corrugated pipes II and the linear type corrugated pipes II; the linear type corrugated pipes I, the linear type corrugated pipes II and the linear type corrugated pipes II are formed by cutting one linear type corrugated pipe. The anti-corrosion rectangular corrugated expansion joint has the advantages of simplicity in manufacturing, low manufacturing cost, less application concentration, corrosion resistance and long service life.

Description

technical field [0001] The invention relates to a pipeline compensator, in particular to a rectangular bellows compensator. Background technique [0002] Adjacent linear bellows of rectangular bellows compensators on the market are connected at right angles or with rounded corners. The rectangular bellows compensator connected at right angles has the following disadvantages in use: since the compensator is welded by four straight bellows cut at 45° oblique angles, there are welds at the right angles, which makes the four corners stressed during use. Concentration, after repeated stretching and compression, the weld seam is very easy to crack, resulting in leakage of the pipeline and scrapping, which increases the cost; the rectangular bellows compensator connected by rounded corners is divided into adjacent linear bellows Circular corrugated pipe welding connection, this connection method can avoid the stress concentration at the right angle of the right angle connection, b...

AI Technical Summary

Problems solved by technology

The rectangular bellows compensator connected at right angles has the following disadvantages in use: since the compensator is welded by four straight bellows cut at 45° oblique angles, there are welds at the right angles, which makes the four corners stressed during use. Concentration, after repeated stretching and compression, the weld seam is very easy to crack, resulting in leakage of the pipeline and scrapping, which increases the cost; the rectangular bellows compensator connected by rounded corners is divided into adjacent linear bellows Circular corrugated pipe welding connection, this connection method can avoid the stress concentration at the right angle of the right angle connection, but there are axial shape and size deviations between the linear corrugated pipe and the circular corrugated pipe due to manufacturing reasons, resulting in linear corrugated pipe and circular corrugated pipe. New stress concentration occurs after the circular bellows is welded, which is likely to cause fatigue failure and shorten the service life of the compensator

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