Analysis Of Deformation And Vibration Mode Of Circular Groove Face Seal

The mechanical seal with circular groove relies on the hydrodynamic pressure effect produced by the sealing medium in the groove area of the end face,forming a liquid film on the end face to separate the end face of the dynamic ring and the static ring,so as to avoid direct contact and reduce the wear of the materials of the dynamic and static rings.It is a non-contact mechanical seal with good sealing performance.However,with the continuous improvement of working condition parameters of mechanical seal,the dynamic pressure effect produced in the slotted area of the seal face is insufficient,which often causes the tearing and cavitation of the liquid film,which leads to the force thermal coupling deformation of the end face friction.In addition,it also causes the vibration of mechanical seal,which affects its sealing performance and stability.Therefore,it is necessary to study the circular groove end face seal.In this paper,the three-dimensional thermal structure coupling model of the seal ring is established,and the response surface analysis of the temperature and deformation of the end face of the seal ring is carried out by using the multi-objective driving optimization.The operating parameters(speed,medium pressure),the parameters of the groove area of the end face of the seal ring(groove depth,center distance,groove radius)are taken as independent variables,and the temperature,thermal deformation and axial deformation of the end face are taken as the corresponding variables The results show that the slotting of the end face can make the temperature and deformation of the end face different,and it is easy for the sealing medium to produce hydrodynamic effect.Taking the minimum temperature and thermal deformation of the end face as the optimization goal,three groups of slot area parameters are optimized based on the selection method of sampling and sorting.Secondly,the same sealing ring model is taken as the research object The vibration frequency of the three common vibration forms(axial,radial and torsional)of the face seal is selected as the output variable.The corresponding influence relationship between them is analyzed by using the response surface.It is found that the different combination of the parameters of the groove area can change the corresponding vibration frequency of the seal ring and the distance between the centers of the rings can be extremely large It has a great influence on the vibration frequency of the seal ring;finally,the prestressed modal analysis is carried out for the connection of the seal ring and bellows as a whole.When the medium pressure and rotation speed are in a certain range,it will have a great impact on the vibration of the seal ring.The research results provide certain theoretical reference and basis for the optimization of the slotted structure of the circular groove mechanical seal and the reduction of the vibration of the seal system.