Seal for a rotary machine

  • US 9,951,637 B2
  • Filed: 09/06/2012
  • Issued: 04/24/2018
  • Est. Priority Date: 09/07/2011
  • Status: Active Grant
First Claim
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1. A rotary machine, comprising:

  • a machine rotor;

    a machine stator;

    a labyrinth seal disposed between the machine rotor and the machine stator; and

    a dry gas seal disposed between the machine rotor and the machine stator, the dry gas seal being disposed downstream of the labyrinth seal;

    the labyrinth seal comprising;

    a labyrinth seal rotor; and

    a labyrinth seal stator, wherein the labyrinth seal stator is an annular ring with a substantially rectangular cross section, is coaxial with the labyrinth seal rotor, the labyrinth seal stator comprising;

    a sealing face portion on an inner circumference of the labyrinth seal stator, the sealing face portion comprises sealing teeth proximate to an outer circumferential surface of the labyrinth seal rotor, a first side portion, a second side portion, and a third side portion, the first side portion and the second side portion extending between the sealing face portion and the third side portion, and wherein the sealing face portion, the first side portion, the second side portion and the third side portion each comprise an outer surface facing a zone and an inner surface facing the cavity; and

    a cavity containing a heat transfer medium configured to transfer heat between the labyrinth seal stator and the zone adjacent the labyrinth seal stator to cool or heat a pressurized process fluid before the process fluid bears against the dry gas seal.

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