| 摘要 |
A self aligning, spiral groove, gas seal having a primary sealing ring and a mating sealing ring with opposed radially extending sealing faces, one of said rings having: (a) Spiral grooves extending inwardly from the outside diameter of the face of one of said rings, said grooves having a depth of between approximately 0.0001 and 0.0003 inches, said grooves extending across the face of said ring to provide a dam width ratio of between approximately 0.5 and 0.8 according to the formula <IMAGE> where GD is the diameter of a circle defined by the boundary of the grooved area and the ungrooved area in said face, ID is the internal diameter and OD is the outside diameter; and (b) Said ring has a balance of between 0.8 and 0.9 according to the formula <IMAGE> where OD is the outside diameter of the sealing interface, ID is the internal diameter and BD is the balance diameter.
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