Magnetic seal assembly
AssigneePratt & Whitney Canada Corp.
InventorMarc-Andre PELLETIER
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Abstract
A magnetic seal assembly comprises a metallic annular wear seal. A magnetic seal has a magnetic annular body adjacent to and attracting the wear seal into contact against a contact face thereof. A retainer ring is connected to a surface to the magnetic seal, the retainer ring having a coefficient of thermal expansion different than a coefficient of thermal expansion of the annular body, the coefficient of thermal expansion of the retainer ring selected to constrain a thermal expansion of the annular body. A method for controlling a thermal expansion of a magnetic seal assembly is also provided.
Claims19
A magnetic seal assembly comprising
- a metallic annular wear seal,
- a magnetic seal having a magnetic annular body adjacent to and attracting the wear seal into contact against a contact face thereof, and
- a retainer ring connected to a surface to the magnetic seal, the retainer ring having a coefficient of thermal expansion different than a coefficient of thermal expansion of the annular body, the coefficient of thermal expansion of the retainer ring selected to constrain a thermal expansion of the annular body.
A method for controlling a thermal expansion of a magnetic seal assembly comprising
- biasing a metallic annular wear seal against a contact face of a magnetic seal,
- generating heat in the magnetic seal as a result of a relative rotation between the annular wear seal and the magnetic seal, whereby the magnetic seal generates thermal expansion forces, and
- applying radial forces to the magnetic seal by a thermal expansion of a retainer ring connected to a surface of the magnetic seal, the retainer ring thermally expanding at a coefficient of thermal expansion different than a coefficient of thermal expansion of the magnetic seal,
- whereby the thermal expansion forces and the radial forces cooperate to control a shape of the magnetic seal.
Dependencies are inferred from the claim text.