Seal-off mechanism for rotating turbine shaft

  • US 4,722,663 A
  • Filed: 02/04/1986
  • Issued: 02/02/1988
  • Est. Priority Date: 02/04/1986
  • Status: Expired due to Term
First Claim
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1. A turbine comprising:

  • a turbine housing having a rotor cavity;

    a rotor in said cavity;

    a first bearing fixed in said housing and displaced from said rotor cavity;

    a shaft rotatably mounted in said bearing, said rotor being fixed to said shaft, said shaft having an annular shoulder facing toward said rotor between said first bearing and said rotor;

    a seal cavity between said rotor cavity and said first bearing about said shaft in said housing;

    a bearing cavity in said housing between said first bearing and said seal cavity;

    a seal ring in said housing about said shaft resiliently biased against said shoulder between said bearing cavity and said seal cavity; and

    vent means for venting said bearing cavity to a preselected differential pressure of said bearing cavity over said seal cavity, said vent means including a bearing cavity vent for said bearing cavity, a valve controlling said bearing cavity vent and a valve controller actuated by differential pressure between said bearing cavity and said seal cavity.

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