The Theoretical Basis of Face Contact Pressure Design of the Zero-Leakage Mechanical Seal

The value of face contact pressure has an important influence on the wear life and leakage rate mechanical seal. For a long time, people have chosen based experience lack theoretical support, which greatly reduces effectiveness Based percolation theory, critical porosity zero-leakage at wetting non-wetting sealing interface working in liquid medium is first discussed. end-face frictional heat friction then investigated. design criteria for seals with long-life operation are established. Afterwards, range seal conventional different calculated, conditions change analyzed. Existing studies shown that can achieve operation. Under rotating stationary rings’ physical parameters given conditions, water propane propylene 0.477~1.132 MPa. diesel larger than propylene, reach 0.477~2.183 condition speed, temperature, range, while speed most significant.