Steam seal

Details Steam seal Steam seal

1979-08-27

1981-09-22

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277155, F16J 1540

Patent

active

042906091

ABSTRACT:
Apparatus for steam sealing a shaft of a steam turbine is disclosed. The apparatus preferably includes at least four sealing rings which encircle the shaft of the steam turbine. The sealing rings are spaced apart to define at least three regions. A first region, closest to the blades of the turbine, receives contaminated steam and exhibits a below-atmospheric pressure. A third region, furthest from the blades of the turbine, also exhibits a pressure which is less than atmospheric pressure, but which pressure is also less than the pressure in the first region. A second region, arranged between said first and third regions, receives uncontaminated steam and exhibits a pressure which is greater than atmospheric pressure.

REFERENCES:
patent: 3919854 (1975-11-01), Denis
patent: 4087097 (1978-05-01), Bossens et al.
patent: 4189156 (1980-02-01), Geary et al.

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