Analysis Of Friction Heat Distribution And Seal Ring Deformation Of Marine Mechanical Seal

As a very important device in rotary power machinery,mechanical seals,when operating under harsh working conditions such as high pressure and high speed,the seal ring is subjected to force deformation and thermal deformation due to the load.Excessive deformation will not only cause an increase in leakage,but also cause uneven distribution of stress on the friction pair,causing local wear and tear or even failure,which in turn threatens the safe operation of the equipment.Compared with contacttype mechanical seals,non-contact mechanical seals have the characteristics of less leakage and less wear and tear.They are more and more used in aerospace,petrochemical,shipbuilding,water conservancy and irrigation industries.Although the thickness of the non-contact sealing liquid film is only a few microns in the thickness direction,it still has an important influence on the performance of the mechanical seal.The change of the liquid film will also affect the dynamic and static rings in contact with it,so it is necessary to carry out the calculation and analysis of the coupling between the liquid film and the ring.In this paper,a mechanical seal with an internal circular arc groove is taken as the research object.Model modeling is completed in the SOLIDWORKS modeling software.The finite element analysis method is used to analyze the liquid film characteristics between the end faces,the force deformation and thermal deformation of the seal ring.And explored the deformation of the seal ring under different working conditions.The main contents and conclusions are as follows:(1)Research on the steady-state flow field characteristics of liquid film.In Fluent,the distribution of liquid film pressure was studied,and the effects of medium pressure,spindle speed,and fluid viscosity on liquid film sealing performance were explored.The results show that the distribution law of total pressure and static pressure on the liquid film is similar,the pressure distribution increases from the outer diameter to the inner diameter,and the high pressure area appears in the groove area;the dynamic pressure differs greatly from the static pressure in value,which is affected by the speed and viscosity Influence,the dynamic pressure value at the inner diameter is smaller than the outer diameter;the total pressure of the liquid film,the leakage amount of the end face and the opening force increase as the medium pressure becomes larger;when the speed increases,the total pressure,the dynamic pressure and the leakage amount of the liquid film increase;The leakage and the dynamic pressure of the liquid film decrease with the increase of the medium viscosity,and the total pressure is positively related to the medium viscosity.(2)Force deformation of fluid-solid coupling mechanical seal ring.According to the fluid-solid coupling analysis method,the liquid area is calculated in the Fluent module and the solid area is calculated in the Static Structural module.The results show that the pressure distribution of the entire liquid film is similar to that of a single periodic liquid film.The pressure decreases from the inner diameter to the outer diameter;the deformation and compressive stress at the inner diameter of the dynamic and static rings are large,which is affected by the pressure distribution;The maximum deformation on the static ring increases with the increase of the medium pressure.Due to the difference in the physical properties of the sealing groove material,the increase is different;the increase in the speed can increase the deformation of the seal ring,but the increase is small.(3)Thermal deformation of the seal ring and thermal deformation under the thermo-solid coupling.Introduce the relevant theory of thermal analysis,analyze the thermal deformation of the sealing ring in Workbench,and then use the thermal-solid coupling analysis method to analyze the thermal deformation of the sealing ring and explore the effect of different working conditions on the deformation.The results show that: the temperature is mainly concentrated on the end surface,the temperature at the inner diameter is higher than the outer diameter,and decreases in the axial direction;the amount of thermal deformation is much larger than the force deformation.The thermal deformation value under the coupling condition is close to the thermal deformation value,indicating that the end surface deformation is thermal deformation Mainly;increase the medium pressure and speed can increase the amount of thermal deformation of the end face.