| 摘要 |
A non-contacting grooved face seal assembly (10) for a shaft rotating at a high pressure and high speed with a combination of two groove patterns on one of the two sealing faces (17, 18; 118) of mating sealing rings (16, 18; 119); one pattern be ing relatively deep angled grooves (34; 134), and the other pattern being a relatively shallow annular groove (44; 144). The relatively deep groove pattern is optimized for hydrodynamic operation and on shaft rotation pumps the sealed fluid between the sealing faces to set the running clearance. The relatively shallow pattern is designed to hydrostatically prevent a friction lock of the sealing faces at starting and stopping of shaft rotation by admitting controlled amount of sealed fluid between the sealing faces (17, 18; 118) when the shaft is at or near to a stationary condition.
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