Film riding shaft seal
AssigneeWestinghouse Electric Corp.
InventorsWilliam A. Byers, Gene J. Zottola
Life of this patent
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Abstract
The invention is a film-riding seal for a pump shaft that is resistant to the deposition of iron oxides such as hematite and goethite on the confronting, spaced apart, seal surfaces. The seal generally comprises a ceramic runner mounted on the pump shaft and an adjacent ceramic stationary sealing ring. The runner has a sealing surface and the stationary sealing ring has sealing surface confronting the runner sealing surface. The ceramic sealing surfaces include a catalyst selected from the group consisting of rhenium, ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, gold and mixtures thereof.
Claims20
A film-riding seal for a pump shaft, comprising:
- a. ceramic runner mounted on the pump shaft, the ceramic runner having a sealing surface;
- a ceramic stationary sealing ring having a sealing surface confronting and spaced from the runner sealing surface;
- wherein at least one of the confronting surfaces comprises a hydrogen oxidation catalyst selected from the group consisting of rhenium, ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, gold and mixtures thereof, whereby said hydrogen oxidation catalyst provides resistance to deposition of iron oxides on the at least one confronting surface.
A film-riding seal for a pump shaft, comprising:
- a ceramic runner mounted on the pump shaft, the ceramic runner having a sealing surface;
- a ceramic stationary sealing ring having a sealing surface confronting and spaced from the runner sealing surface;
- wherein at least one of the confronting surfaces comprises a hydrogen oxidation catalyst selected from the group consisting of rhenium, ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, gold-and mixtures thereof whereby said hydrogen oxidation catalyst provides resistance to deposition of iron oxides on the at least one confronting surface and the at least one confronting surface has a hematite unstable electrochemical potential when in contact with water at 65° C. and a pH of 6.5-7.
A film-riding seal for a pump shaft, comprising:
- a ceramic runner mounted on the pump shaft, the ceramic runner having a sealing surface;
- a ceramic stationary sealing ring having a sealing surface spaced from the runner sealing surface;
- wherein at least one of the sealing surfaces comprises a hydrogen oxidation catalyst selected from the group consisting of rhenium, ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, gold and mixtures thereof whereby said hydrogen oxidation catalyst provides resistance to deposition of iron oxides on the at least one sealing surface.
Dependencies are inferred from the claim text.