Large compensation external pressure expansion joint with heat preservation reset

Abstract

The invention relates to a large compensation external pressing type expansion joint with heat preservation reset. The large compensation external pressing type expansion joint with the heat preservation reset comprises an external pipe and an internal pipe which is installed inside the external pipe; a guide cylinder sleeves inside one end of the internal pipe; the guide cylinder is externally connected with an end pipe; a first pressure bearing ring plate is arranged on the end pipe; the first pressure bearing ring plate is fixedly connected with one end of the external pipe; a group of corrugated pipes sleeve the internal pipe; the corrugated pipes and the internal pipe are coaxial; the corrugated pipes are mutually in series connection; a front section corrugated pipe in the corrugated pipes which are in mutual series connection is fixedly connected with the ring plate which is installed on the internal pipe through a short connecting pipe; a tail section corrugated pipe is fixedly connected with a second pressure bearing ring plate which is installed at the other end of the external pipe; an external protective sleeve is externally connected to the other end of the external pipe; a heat preservation reset device is arranged inside the external protective sleeve; a displacement uniform distribution assembly is arranged between the adjacent corrugated pipes. The large compensation external pressing type expansion joint with the heat preservation reset has the advantages of satisfying a large displacement compensation requirement, meanwhile satisfying an expansion joint fatigue life requirement, guaranteeing the product stability, preventing a heat preservation layer from getting vacant due to the fact that the heat preservation materials can reset along with a pipeline and reducing energy consumption.

Description

technical field [0001] The invention relates to a pipeline expansion joint, in particular to a large compensation external pressure bellows expansion joint with heat preservation and reset. Background technique [0002] The bellows expansion joint is a compensation device that uses the expansion and contraction of the bellows to absorb the displacement or size change of the pipeline due to thermal expansion and contraction. It is widely used in petrochemical, metallurgy, electric power and heating network industries as a thermal compensation element. in the pipeline. The external pressure bellows expansion joint is mainly composed of a bellows bearing external pressure, an outer tube and an end ring. The expansion joint also uses the tensile deformation of the bellows to absorb the axial displacement of the pipeline. Absorbed displacement is one of the performance indicators to measure the compensation ability of expansion joints. The larger the absorbed displacement, the s...

AI Technical Summary

Problems solved by technology

[0007] The multi-segment bellows series structure is adopted to increase the compensation amount of the expansion joint, and a displacement equalizing component is installed between each segment of the bellows. The displacement equalizing component solves the uneven and stable deformation of each segment of the bellows in the multi-segment series structure. Poor performance and other problems, so that the stretching displacement of each section of bellows is the same, to achieve uniform compensation of each section of bellows, to avoid tensile damage caused by excessive deformation of a single bellows, and to improve the fatigue life of the expansion joint

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