A high-temperature wear-resistant and anti-corrosion axial anti-twist expansion joint

Abstract

A high-temperature, wear-resistant, corrosion-resistant and axial torque preventing expansion joint comprises a corrugated pipe, a first end pipe and a second end pipe. The first end pipe and the second end pipe are welded to two ends of the corrugated pipe. The corrugated pipe is filled with thermal insulation ceramic fiber felt. A thermal insulation layer is disposed on the inner wall of each of the first end pipe, the second end pipe and a guide cylinder, and anchor parts are evenly distributed in the thermal insulation layer. The bottoms of the anchor parts disposed in the guide cylinder and the bottoms of the anchor parts disposed in the second end pipe are respectively welded with the outer walls of first hexmetal and second hexmetal. The first hexmetal and the second hexmetal are cylindrical. A wear-resistant corrosion-resistant layer covers the inner wall of each of the first hexmetal and the second hexmetal. The high-temperature, wear-resistant, corrosion-resistant and axial torque preventing expansion joint is further provided with two identical torque preventing structures. The high-temperature, wear-resistant, corrosion-resistant and axial torque preventing expansion joint has the advantages that the working temperature of the corrugated pipe is lowered effectively, the wear resistance, corrosion resistance and impact resistance of the expansion joint are increased, additional torsion shearing force borne by the corrugated pipe can be avoided by the torque preventing structures; the service life of the expansion joint is prolonged evidently and the operation stability of a pipeline system is increased as compared with the prior art.

Description

technical field [0001] The invention relates to a pipe network component, in particular to a high-temperature wear-resistant and anti-corrosion axial anti-twist expansion joint, which belongs to the technical field of pipe fittings. Background technique [0002] High-temperature axial expansion joints are widely used in high-temperature, high-scouring and high-pressure pipelines in metallurgy and petrochemical industries to absorb axial displacement of pipelines caused by temperature changes. The important component that constitutes the high temperature axial expansion joint is the bellows. The bellows must have high pressure bearing capacity, good flexibility, and certain stability, fatigue life and corrosion resistance during use. , it is the weak link in the whole high temperature axial expansion joint. At present, the problems of ordinary high-temperature axial expansion joints are as follows: 1. The bellows work under high-temperature conditions for a long time during ...

AI Technical Summary

Problems solved by technology

At present, the problems of ordinary high-temperature axial expansion joints are as follows: 1. The bellows work under high-temperature conditions for a long time during the transmission of high-temperature medium, and the impact of high-temperature medium on the bellows shortens the service life of the bellows; 2. In order to ensure the axial displacement of the axial expansion joint, it is difficult to balance the anti-wear, anti-corrosion and thermal insulation structures in a section of the non-rigid connection between the outlet side of the guide cylinder and the side end pipe, making this area a vulnerable area for the axial expansion joint. 3. Due to the deformation of the pipe due to temperature changes, a large torque will be generated on the high temperature axial expansion joint, causing the bellows to bear a large torsional shear stress, and the ability of the high temperature axial expansion joint components to transmit and absorb torque is poor, resulting in The bellows are severely deformed or even torn

The above problems seriously affect the service life of high-temperature axial expansion joints, increase the cost of pipeline operation, and also bring hidden dangers to the safe operation of high-temperature and high-pressure pipelines

Images