Piston type high pressure expansion joint

Abstract

The invention belongs to the field of high pressure pipeline connection, and in particular relates to a piston type high pressure expansion joint. The piston type high pressure expansion joint primarily comprises an outer bushing of a piston, an inner pipe body of the piston, a plurality of bidirectional action oil cylinders, a limiting and stopping flange, a locking key type combined flange, a locking key, a sliding supporting ring and a high pressure sealing part. The locking key type combined flange is fixedly connected to the inner pipe body of the piston. Pistons of the bidirectional action oil cylinders are fixedly connected to the outer bushing of the piston. Cylinder barrels of the bidirectional action oil cylinders are fixedly connected to the locking key type combined flange. According to relative movement of the bidirectional action oil cylinders, the outer bushing of the piston and the inner pipe body of the piston, active and passive adjustment on the length direction of the high pressure pipeline can be achieved, so that the piston type high pressure expansion joint has the advantages of being large in diameter, high in super-pressure, large in expansion and contraction quantity, quick to disassemble and assemble, long in service life and the like.

Description

technical field [0001] The invention belongs to the technical field of high-pressure pipeline connection, and in particular relates to a piston-type high-pressure expansion joint. Background technique [0002] The expansion joint is set in the middle of the high-pressure pipeline, which can compensate the deformation caused by thermal expansion and contraction in the length direction of the pipeline and maintain the tightness of the pipeline. It is also used for length compensation of the pipeline due to installation and adjustment; existing pressure pipeline connection Bellows expansion joints are mainly used. The larger the nominal diameter, the smaller the pressure bearing capacity; with the development of pipelines to large diameters and high pressure resistance, bellows expansion joints have exposed defects that cannot withstand high pressure and are limited by diameter. It is necessary to develop more advanced devices to meet the limited working environment of the exis...

AI Technical Summary

Problems solved by technology

[0002] The expansion joint is set in the middle of the high-pressure pipeline, which can compensate the deformation caused by thermal expansion and contraction in the length direction of the pipeline and maintain the sealing of the pipeline. It is also used for length compensation of the pipeline due to installation and adjustment; existing pressure pipeline connection Bellows expansion joints are mainly used, and the larger the nominal diameter, the smaller the pressure bearing capacity; with the development of pipelines in the direction of large diameter and high pressure resistance, bellows expansion joints have exposed defects that cannot withstand high pressure and are limited by diameter. It is necessary to develop more advanced devices to meet the limited working environment of the existing bellows expansion joints

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