Face Seal with Backup Ring

摘要

A face seal includes first and second members which are mounted together, a seal member, and a backup ring. The first member extends along a longitudinal axis and defines an interior cavity. The first and second members each includes a respective sealing surface that extends radially relative to the longitudinal axis. At least one of the sealing surfaces defines an annular groove. The seal member is disposed within the annular groove and is in sealing contact with the sealing surfaces. The backup ring is disposed within the annular groove such that the seal member is radially inward of the backup ring. One sealing surface is movable relative to the other sealing surface in response to increased interior cavity pressure, thereby defining a gap therebetween. The backup ring is interposed between the seal member and the gap such that the backup ring occludes an opening to the gap.

主权项

1. A face seal comprising:
a first member, the first member extending along a longitudinal axis, the first member including a first sealing surface, the first sealing surface extending radially relative to the longitudinal axis, the first member defining an interior cavity; a second member, the second member and the first member being mounted together, the second member including a second sealing surface, the second sealing surface extending radially relative to the longitudinal axis, the second sealing surface being adjacent to the first sealing surface, at least one of the first sealing surface and the second sealing surface defining an annular groove; a seal member, the seal member being annular and having a seal diameter, the seal member being disposed within the annular groove, the seal member in sealing contact with the first sealing surface and the second sealing surface; a backup ring, the backup ring being annular and having a ring diameter, the ring diameter being larger than the seal diameter, the backup ring being disposed within the annular groove such that the seal member is radially inward of the backup ring; wherein the second sealing surface is movable relative to the first sealing surface in response to an axial force applied along the longitudinal axis by an interior cavity pressure, thereby defining an axial gap between the first sealing surface and the second sealing surface, the axial gap having an outer gap opening adjacent the annular groove, and wherein the backup ring is interposed between the seal member and the outer gap opening of the axial gap such that the backup ring occludes the outer gap opening.