| 摘要 |
<p>The seal having a primary sealing ring (20) and a mating sealing ring (26) with opposed radially extending sealing faces (22-24), one of said rings (26) having:
a) Spiral grooves (70) extending inwardly from the outside diameter of the face of one of said rings (26), said grooves (70) having a depth of between approximately. 0.0025 and 0,0075 mm, said grooves (70) extending across the face (24) of said ring (26) to provide a dam width ratio of between approximately .5 and .8 according to the formula
<MATH>
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 of the sealing interface and OD is the outside diameter of the sealing interface; and
b) Said ring has a balance of between .8 and .9 according to the formula
<MATH>
where OD is the outside diameter of the sealing interface, ID is the internal diameter and BD is the balance diameter. </p> |
