| 摘要 |
A non-contacting face seal for shafts rotating at high speeds with improved secondary sealing means for low axial drag forces. Secondary sealing means comprise an O-ring (26) with a compliant spring element (28, 52, 56) at its outer circumference. Compliant spring (28, 52, 56) provides a controlled radial force, which keeps the secondary seal (26) in a more reliable sealing contact with the seal ring (18) and the seal housing balance surface (30) but avoids excessive radial forces, typical for secondary seal located between two machined cylindrical surfaces. Low axial drag forces due to secondary seal displacements are important for prevention of sealing face hang-up and consequent high leakage condition.
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