Method of removing stators from tubular stator housings

  • US RE42,416 E1
  • Filed: 12/13/2007
  • Issued: 06/07/2011
  • Est. Priority Date: 02/08/2002
  • Status: Expired
First Claim
Patent Images

1. A method of removing stators from tubular stator housings, comprising the steps of:

  • placing a metal tubular stator housing having an interior surface to which a worn elastomer moineau-style 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 avoid thermal shock to the tubular stator housing;

    raising the temperature of the tubular stator housing gradually to ambient temperatures, the stator shrinking and pulling away from the interior surface of the tubular stator housing as the temperature is gradually lowered and then gradually raised.

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