关键词: 机械密封, 密封性能, 倾斜菱形孔, 动压效应

Abstract: Based on a liquid lubrication theory, influence of operating parameters and texturing parameters on open force, film stiffness and leakage was numerically investigated. Then upstream and downstream pumping principles of the inclined diamond pores were discussed. Results show that the liquid seal with bidirectional inclined diamond pores had larger hydrodynamic open force, more reliable liquid membrane stability and lower leakage than those with unidirectional. At low speed, bidirectional inclined diamond pores texture can make seal end faces opened quickly, and can effectively reduce the friction and wear between two end faces in the startup phase. At the same time, the leakage of the inclined diamond pores texture seal can also be reduced; Under the operation conditions of research, the liquid membrane stability (Self adaptive capacity of the variable conditions) of the non inclined diamonds texture seal was the best in the three (the bidirectional, unidirectional and non inclined diamond pores texture seals); And optimization range of reverse pores ratio, pores inclination angle, pores area rate and pores depth was obtained.

Key words: Mechanical seal, Seal performance, Inclined diamond pores, Hydrodynamic effect