Bellows compensator, also called telescopic joint or expansion joint, is mainly used to ensure the safe operation of pipelines. It is a flexible, thin-walled, transversely corrugated device with telescopic function. The main elastic element is stainless steel bellows, which relies on the expansion, contraction and bending of bellows. The pipeline carries out axial, transverse and angular compensation. Its functions can: .Compensate and absorb the axial, transverse and angular thermal deformation of the pipeline.
.Absorb equipment vibration and reduce the impact of equipment vibration on pipelines.
.Absorb the deformation of pipelines caused by earthquakes and ground subsidence.
The bellows compensator is composed of metal bellows and components. The working principle of the bellows compensator is to use its own elastic expansion and contraction function to compensate for the axial, angular, lateral and combined displacements of the pipeline caused by thermal deformation, mechanical deformation and various mechanical vibrations. It has the function of pressure resistance, The functions of sealing, corrosion resistance, temperature resistance, impact resistance, vibration and noise reduction can reduce pipeline deformation and increase pipeline service life.
The advantage of the bellows compensator is that it adopts an advanced overall one-time hydroforming process that does not damage the bellows. The product features are high dimensional accuracy, long service life, reliable performance, compact structure, large compensation capacity, long fatigue life, high pressure-bearing capacity, widely used materials, simple piping and no need for maintenance in engineering applications, large diameter, high temperature resistance, and strong resistance to stress corrosion. But it also has shortcomings that are not easy to solve: For example, the axial corrugated compensator produces pressure thrust on the fixed bracket, causing the fixed bracket to have a large thrust and high cost. In addition, the corrugated compensator pipe wall is thin and cannot withstand torsion, and has poor vibration safety. High equipment investment and design requirements There are a series of shortcomings such as strict construction and installation accuracy, and often not reaching the expected life span.
Under normal circumstances, the material used for metal bellows compensator should meet the following conditions:
) High elastic limit tensile strength and fatigue strength to ensure that the bellows works.
) Good plasticity to facilitate the compensator molding and processing and obtain sufficient hardness and strength through subsequent processing (work hardening heat treatment, etc.).
) Good corrosion resistance to meet the requirements of bellows working in different environments.
) Good welding performance to meet the welding process requirements during the production of bellows.
Applications of bellows compensator:
Pipes with large deformation and limited spatial position.
, large diameter pipes with large deformation and displacement and low working pressure.
, It is necessary to limit the equipment that takes over the load.
, pipes required to absorb or isolate high-frequency mechanical vibrations.
, pipes required to absorb earthquakes or foundation settlement.
, Absorb the vibration at the pipeline pump outlet.
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