Seal ring for hydrogen cooled generator

A seal ring assembly comprising:

• a seal casing defining a radially inwardly directed channel;
• a first seal ring axially disposed from a second seal ring, the first seal ring having a first axial face opposing a second axial face of the second seal ring, a radial oil channel defined between the first axial face and the second axial face, both the first seal ring and the second seal ring comprising a tapered surface configured to contact a spring, the spring configured to bias the first seal ring away from the second seal ring via the tapered surface, the first seal ring and the second seal ring disposed in the radially inwardly directed channel;
• at least one of the first seal ring or the second seal ring comprising a plurality of evenly spaced protrusions that extend beyond the first axial face or the second axial face, wherein the plurality of protrusions are configured to create a passageway to allow oil to flow through the passageway and to allow at least one of the first seal ring or the second seal ring to move by reducing static friction between the first axial face and the second axial face, each of the plurality of protrusions having a radially outer tapered surface and a radially inner tapered surface with an axial facing surface disposed between the radially outer tapered surface and the radially inner tapered surface, the radially inner tapered surface is the bottommost surface of at least one of the protrusions, both of the radially outer tapered surface and the radially inner tapered surface are configured to facilitate oil flow past each of the protrusions;
• and
• wherein the plurality of protrusions extend about one third to about one half of the way into the radial oil channel, wherein the combined surface area of the axial facing surfaces is less than half of the surface area of the rest of the first or second axial face of the one of the first or second seal rings, and wherein both the first seal ring and the second seal ring comprise a wearable material located at an inner radial position thereof, the wearable material configured to reduce wear on a rotor shaft.