Method and apparatus for variable clearance packing

Details Method and apparatus for variable clearance packing Method and apparatus for variable clearance packing

2006-05-25

2010-06-08

Look, Edward (Department: 3745)

Rotary kinetic fluid motors or pumps

Bearing, seal, or liner between runner portion and static part

Between blade edge and static part

C415S174200, C415S174500

Reexamination Certificate

active

07731478

ABSTRACT:
Methods and apparatus for a packing ring segment assembly for sealing a turbine gas path are provided. The assembly includes a sealing portion including radially inwardly directed teeth, and a dovetail mounting portion including a hollowed out portion including a biasing member internal to the packing ring segment. The biasing member is coupled to the packing ring segment and configured to engage a pair of annular shoulders of a dovetail groove in the turbine such that the packing ring segment is biasing radially outward at relatively low turbine loads and low working pressure, and at relatively high turbine loads and high working pressure a working fluid overcomes the radial biasing member forces and urge the packing ring segment radially inward.

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EP Search Report, App. No. 07108513, Nov. 29, 2007.

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