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US 2003/0150098 A1Published application
Method of removing stators from tubular stator housings
OwnerJohn Russell McKayinventor
Life of this patent
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Abstract
A method of removing stators from tubular stator housings involving subjecting a tubular stator housing having an interior surface to which a worn stator is adhered by adhesive to cryogenic refrigeration until the stator shrinks and pulls away from the interior surface of the tubular stator housing.
Claims3
A method of removing stators from tubular stator housings, comprising:
- subjecting a tubular metal stator housing having an interior surface to which a worn elastomer stator is adhered by adhesive to cryogenic refrigeration until the elastomer stator shrinks and pulls away from the interior surface of the tubular metal stator housing, the temperature of the tubular metal stator housing being gradually lowered to cryogenic levels and then gradually raised to ambient temperature in order to have the tubular metal stator housing and elastomer stator shrink at substantially the same rate and avoid thermal shock.
A method of removing stators from tubular stator housings, comprising:
- placing a tubular metal stator housing having an interior surface to which a worn elastomer stator is adhered by adhesive into a cryogenic refrigeration unit;
- lowering the temperature in the cryogenic refrigeration unit gradually to cryogenic levels in order to have the tubular metal stator housing and elastomer stator shrink at substantially the same rate and avoid thermal shock, the temperature in the cryogenic refrigeration unit reaching temperatures of between minus 150 degrees celsius and minus 200 degrees celsius;
- raising the temperature in the cryogenic refrigeration unit gradually to ambient temperatures in order to avoid thermal shock, the elastomer stator shrinking and pulling away from the interior surface of the tubular stator housing as the temperature is gradually lowered and then gradually raised;
- and
- exerting a force upon the worn stator to slide the worn stator out of the tubular stator housing.
2 more elements
Dependencies are inferred from the claim text.