Research On Storage Deformation Of Defected Mounting Mechanical Seals

During the natural storage process,due to the long-term effect of the combined pressure,the static ring seat of static ring component of the mounted mechanical seals on a turbo pump undergoes creep deformation,which causes the end face of the static ring to deform.which occurs during processing or assembly.Defects generated during processing or assembly(such as the eccentricity of the inner and outer circles of the static ring,the deviation of the interference,the deflection of the mounting,etc.)aggravate the deformation of the end face of the static ring component,and eventually causes the seal to fail.In this paper,for the static ring component of the mounted mechanical seal,the method of numerical simulation and accelerated test is used to study the influence of various defects on the deformation of the end surface of the static ring component.Based on Norton-Bailey creep model,using ANSYS Workbench software,a finite element model of the static storage component's natural storage deformation is established,and the deformation laws of various static ring components' end faces during natural storage are obtained.At the same time,the effects of various defects on the static ring component's end face deformation are obtained.The research results show that the deformation of the end face of the static ring component with mounting deflection defects is the largest,followed by the eccentric defects of the inner and outer circles of the static ring,the deviation of the interference deviation and the normal minimum.In the circumferential direction,the end surface of the static ring component with the inner and outer circle eccentricity and mounting deflection defects of the static ring deforms into a saddle shape.The static ring component with interference deviations and no defects has almost no saddle-shaped deformation.In the radial direction,the deformation of the end faces of various static ring components is tapered,that is,the inside is high and the outside is low.The eccentricity of the inner and outer circles of the static ring and the mounting deflection defects have exacerbated the deformation of the end face of the static ring component,and the influence of the latter is more obvious.The defect of interference deviation will not aggravate the deformation of the end face of the static ring component.Based on Norton-Bailey creep model,the ANSYS Workbench software is used to establish a finite element model of the temperature cycle acceleration storage deformation of the static ring component.The deformation law of the end face of the static ring component during the temperature cycle acceleration process is obtained,and the acceleration effect of different temperature cycling stress on the end surface deformation of the static ring component is obtained.The results show that Temperature cycling stress accelerates the deformation of the end face of the static ring component.During the temperature cycle acceleration,the deformation law of the end face of the static ring component is consistent with natural storage.The cycle interval has a greater influence on the acceleration effect of temperature cycle stress,and the effect of holding time is small.The defective static ring components were manufactured,and the end surface deformation test devices of the static ring component were designed,and the temperature cycle accelerated storage deformation test was carried out,the acceleration effect of different temperature cycling stress on the deformation of the end surface of the static ring component is obtained,the deformation law of the end surface of various static ring components is obtained,and the influence of various defects on the deformation of end face of the static ring component and the seal performance of the mounting mechanical seal is obtained.The results show that the larger the cycle interval,the more obvious the acceleration effect on the deformation of the end face of the static ring component.The end face of the static ring component with the inner and outer circle eccentricity and mounting deflection defects shows saddle-shaped deformation,while the static ring component with interference deviation and no defects does not show saddle-shaped deformation.Mounting deflection defects can aggravate the deformation of the end face of the static ring component,but the eccentric defects of the inner and outer circles of the static ring have little effect on aggravating,and the deviation of the interference deviation has no aggravating effect..The accuracy of the simulation analysis of natural storage and temperature cycle acceleration process is verified.Mounting deflection defects have a greater impact on the sealing performance of mounted mechanical seals,and other defects have little effect.This article is of great significance for improving the processing and assembly process of mounted mechanical seals and improving the storage life of turbo pumps.