Sealing Sleeve for Slip Joint

摘要

A sleeve for sealing an annular gap between opposed co-axial surfaces of a slip joint includes a tubular body formed from a metallic material and having a first end, a second end, a center section between the first and second ends, and a longitudinal cross-sectional profile having a plurality of bendable curves. The sleeve is shaped so that two or more of the bendable curves contact each opposed coaxial surface to form two or more circumferential lines of contact with each opposed coaxial surface. The sleeve further includes a self-protective oxide undercoat layer that protects the metallic material and a lubricous overcoat layer that provides lubricity to the contact surfaces when the sleeve is exposed to temperatures greater than about 600° C.

主权项

1. A sleeve for sealing an annular gap between opposed co-axial surfaces of a slip joint, the sleeve comprising:
a tubular body formed from a metallic material and having a first end, a second end, a center section between the first and second ends, and a longitudinal cross-sectional profile having a plurality of bendable curves, with at last two bendable curves contacting each opposed coaxial surface to form at least two circumferential lines of contact with each opposed coaxial surface; an undercoat layer comprising a self-protective oxide coating and covering substantially all of the surface area of the tubular body; and an overcoat layer covering the undercoat layer at least about the lines of contact and configured to provide lubricity to the contact surfaces when the sleeve is exposed to temperatures greater than about 600° C., wherein a non-flexed distance between opposing circumferential lines of contact is between about 6% and about 14% greater than an average distance between the opposed coaxial surfaces, as measured perpendicular to a longitudinal axis of the tubular body.