Research On Sealing Performance And Deformation Property Of Split Mechanical Seal With Spiral Groove Shape Face

Compared with the conventional mechanical seal, split mechanical seal is easy installed、removed and economic, this thesis focuses on the sealing performance and deformationproperty of split mechanical seal with spiral groove shape face. Firstly, according to workingparameters, design a new split mechanical seal component with spiral groove shape on the endface of split rotary ring, using ANSYS-Fluent for the flow field of spiral groove in numericalsimulation, the influence of the working parameters and the geometrical parameters on thesealing performance was analyzed, the geometrical parameters was optimized. Secondly, theanalysis of the sealing pressure, shaft speed, flushing, film thickness and stirrups compressivestress on steady state temperature field, thermal deformation and thermal-structural couplingdeformation of the split mechanical seal was analyzed. The main works are as follows:(1)Designed a new split mechanical seal which is easy installed、removed and used in highpressure working conditions. Main features are: split rotary and static ring is half-ring, easy toinstall and replace; when sealing pressure is greater, the contact pressure of joint face isincreased, sealed medium outflow resistance is improved;(2) Used ANSYS-Fluent for the flow field of spiral groove in numerical simulation, theresults show that:(a) The optimize parameters of the spiral groove is:12°<α<18°,5μm<h<10μm,0.5<β <0.8,0.4<γ <0.7,8<Ng <14.(b) Orthogonal analysis showed that: the groove depth and the groove-dam length ratiohave a important effect on the pumping volume; the groove depth, the groove-dam length ratiohave a significant effect on the opening force, the number of groove have a important effect onthe opening force; the groove depth have a important effect on the axial stiffness, the spiralangle,the groove-dam length ratio have a important effect on the axial stiffness ratio.(3)Used ANSYS thermal-structural coupling analysis module for the analysis of steadystate temperature field, thermal deformation and thermal-structural coupling deformation of thesplit mechanical seal. The results indicate that:(a)the highest temperature of the seal face is in the inner diameter, and the facetemperature of split static ring is significantly higher than the split rotary ring, and thetemperature of the rings generate positive coning deformation on sealing face and joint face,and the deformation can be effectively suppressed by the stirrups compressive stress.(b)When flushing is greater, the face temperature of split static ring decreased andtemperature difference increased, positive coning deformation increases, thermal-structuralcoupling deformation increases, positive coning deformation increases; secondly, thermaldeformation of joint face on X axis increases, positive coning deformation increases. thetemperature and face temperature difference of split rotary ring all decreased, positive coning deformation decreases; thermal-structural coupling deformation and positive coningdeformation decreased; secondly, thermal deformation and positive coning deformation of jointface on X axis decreased.(c) When the film thickness is greater, the face temperature and temperature difference ofsplit static ring all decreased, positive coning deformation decreased; thermal-structuralcoupling deformation decreased, positive coning deformation decreased; secondly, thermaldeformation of joint face on X axis decreased, positive coning deformation decreased. the facetemperature and temperature difference of split rotary ring all decreased, positive coningdeformation decreased; thermal-structural coupling deformation decreased, positive coningdeformation firstly decreased and then increased; secondly, thermal deformation and positiveconing deformation of joint face on X axis decreased.(d)The shaft speed had the same influence on split static and rotary rings. When the shaftspeed is greater, the face temperature and temperature difference all increased, positive coningdeformation increased; thermal-structural coupling deformation increased, positive coningdeformation increased; secondly, thermal deformation of joint face on X axis increased, positiveconing deformation increased.(e) When stirrups compressive stress is greater, thermal-structural coupling deformationof split static and rotary rings increased, positive coning deformation increased. Therefore,should ensure stirrups compressive stress according to working parameters.