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Floating air seal for a turbo machine

  • US 8,215,645 B1
  • Filed: 05/17/2010
  • Issued: 07/10/2012
  • Est. Priority Date: 05/17/2010
  • Status: Active Grant
First Claim
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1. A floating seal comprising:

  • a rotor having a floating seal forming surface substantially perpendicular to a rotating axis of the rotor;

    a stationary stator located adjacent to the rotor;

    an annular groove formed within the stator and opening toward the floating seal forming surface of the rotor;

    an annular floating piston axially movable within the annular groove of the stator;

    the annular floating piston having an annular flange with an annular groove formed on the rotor side;

    the annular piston having a plurality of feed holes opening into an annular manifold formed between the annular piston and the annular flange;

    the annular flange having a plurality of baffle holes passing through and opening into the annular manifold;

    the feed holes being offset from the baffle holes in order to reduce a Helmholtz excitation from an air flow through the feed holes and the baffle holes;

    two of the baffle holes are used for each one of the feed holes;

    the annular floating piston having a fluid pressure reacting surface on an opposite side to the annular groove; and

    ,the annular floating piston having a fluid passage connecting the fluid pressure reacting surface to the annular groove to supply a fluid pressure and form a fluid cushion for the floating seal.

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