Rectangular expansion joint

Abstract

The invention discloses a rectangular expansion joint comprising a left inner pipe, joint pipes, two corrugated pipes, a middle inner pipe, packing and a right inner pipe. The left inner pipe, the middle inner pipe and the right inner pipe are all rectangular pipes of the same specification, the left inner pipe and the right inner pipe are double-section rectangular pipes, the three inner pipes are sleeved coaxially, one circular corrugated pipe is hermetically connected to the outer walls on two sides of the axial joint of every two adjacent inner pipes through the paired joint pipes, and the two circular corrugated pipes of the same specification form a compensation structure for linkage of the three coaxially sleeved inner pipes. The joint pipes are transition pieces, inner holes of the joint pipes are rectangular, the size of each inner hole is equal to that of the outer wall of the matched inner pipe, the joint pipes are circular in outer counter, and the outer diameter of each joint pipe is equal to the inner diameter of each corrugated pipe. In order to avoid impact of high-temperature media on the corrugated pipes, an inner cavity of each corrugated pipe is filled with the packing to achieve heat insulation effect. An external connecting structure is not changed, and only the circular corrugated pipes substitute for rectangular corrugated pipes, so that the structure is simple in connection, good in compensation effect and prone to engineering supporting.

Description

technical field [0001] The invention relates to a pipeline safety device, in particular, the invention relates to a rectangular expansion joint matched with a pipeline for conveying solid particle materials. Background technique [0002] Today, large-scale thermal power plants, cement and steel smelting and other industries generally use pipelines to transport solid granular materials, and most of the working conditions are intermittent transportation. Under normal working conditions, the temperature of the solid particles transported is as high as 300°C to 500°C, and the heated pipeline will inevitably generate corresponding internal stress. The internal stress is very destructive, which brings safety hazards to the pipeline operation. Corresponding control measures must be taken in the pipeline engineering to achieve safe operation. Under the existing technical conditions, it is the most effective technology to configure the pipeline compensation device in the pipeline. O...

AI Technical Summary

Problems solved by technology

However, the bellows configured in the rectangular expansion joints in the prior art are rectangular, and the structural feature of the rectangular bellows is a welded structure, and the welds at the four corners have a structural strengthening effect, resulting in an unbalanced expansion capacity between the four sides and the four corners of the rectangular bellows, which directly reduces The flexibility of the expansion of the bellows causes some internal stress to remain in the supporting pipeline

In addition, the rectangular corrugated pipes in the prior art are manufactured in a single piece and formed by butt welding at four corners. The entire manufacturing process is complex, the product precision is poor, and the production efficiency is low. This structure is only suitable for single-piece or small-batch production

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