Steel two-sided casing pipe expansion piece

Abstract

The invention discloses a steel two-sided casing pipe expansion piece and belongs to the technical field of underground pipelines. The steel two-sided casing pipe expansion piece comprises a body, twosets of pressing rings, two sets of sealing rings, bolts and nuts, wherein the bolts and the nuts are arranged at the two ends and used for achieving fixed connection; sealing rings are arranged on the left side and the right side of the body; the pressing rings are arranged on the outer sides of the sealing rings and used for pressing the sealing rings; and the pressing rings are in fastened connection with the body through the bolts and the nuts. By means of the steel two-sided casing pipe expansion piece, the displacement compensation function with high axial expansion amount can be provided, two-way flowing of media in the device is achieved, meanwhile, quick field pipeline connection is achieved, the steel two-sided casing pipe expansion piece is a quick pipeline connector through which pipeline maintenance personnel can perform construction and field maintenance quickly and accurately in the emergency maintenance work, accordingly, safe and efficiency pipeline running is ensured, and the steel two-sided casing pipe expansion piece can be widely used and popularized in a medium-and-low pressure underground pipe network system.

Description

technical field [0001] The invention relates to the technical field of underground pipelines, in particular to a steel double-sided casing expander. Background technique [0002] The pipeline system will expand or shrink due to thermal expansion and contraction, which will affect the safe operation of the pipeline system. For this, a pipeline compensator with bellows as the core component is usually used to compensate the thermal expansion and contraction of the pipeline. However, the existing pipeline compensators have the following defects: First, the bellows used are usually 300 series stainless steel. In order to meet the displacement compensation performance with large axial expansion and contraction, thin-walled stainless steel is usually selected through hydraulic processing, which is not particularly resistant Corrosion of corrosive media in groundwater and soil environments, a large number of corrugated compensators are usually required to be installed in the piping...

AI Technical Summary

Problems solved by technology

However, the existing pipeline compensators have the following defects: First, the bellows used are usually 300 series stainless steel. In order to meet the displacement compensation performance with large axial expansion and contraction, thin-walled stainless steel is usually selected through hydraulic processing, which is not particularly resistant Corrosion of corrosive media in groundwater and soil environments, a large number of corrugated compensators are usually required to be installed in the piping system. Due to the existence of bellows forming stress, if there is tensile stress (tensile displacement) in the corrugated compensator during installation and use The corrugated compensator placed in a corrosive environment is prone to stress corrosion. If the two ends of the installation are not in the same axis, it will easily lead to fatigue damage, thus increasing the construction cost of the pipeline; secondly, the existing pipeline compensator is used to avoid the medium The direct flushing of the inner wall of the bellows needs to be designed with a guide tube. With the guide tube, the flow of the medium will be directional. This will limit the flow direction of the medium for pipelines that require a circular flow of the medium, such as the flow direction of the pipeline. Normal operation cannot be effectively guaranteed, or if it is not implemented according to the specifications, there will be safety hazards in pipeline operation

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