Rotary kinetic fluid motors or pumps – Including heat insulation or exchange means – Cooling fluid contacts shaft – seal or bearing
Patent
1984-01-18
1985-10-08
Garrett, Robert E.
Rotary kinetic fluid motors or pumps
Including heat insulation or exchange means
Cooling fluid contacts shaft, seal or bearing
415117, 415168, 415176, F01D 508, F01D 2512
Patent
active
045457255
ABSTRACT:
A stress corrosion cracking proof steam turbine in which dry steam is blown into the gap between the hub portions of adjacent turbine discs, thereby preventing corrosion in the gap. A nozzle diaphragm is provided between the discs and has an inside circumferential face which straddles the gap. Labyrinthine packing is provided on the inside face of the nozzle diaphragm and comprises an upstream, an intermediate, and a downstream group of fins. A steam reservoir is located between the intermediate and downstream group of fins and straddles the gap. A steam supply means is located inside the nozzle diaphragm and provides dry steam (from inside or outside the turbine) to the reservoir and thus to the gap. To prevent leakage of high pressure wet steam into the reservoir, a steam leakage capturing means is provided between the upstream and the intermediate group of fins. This capturing means is connected to the low pressure side of the diaphragm via a steam leakage bypass means, thereby preventing high pressure wet steam from entering the reservoir.
REFERENCES:
patent: 2738949 (1956-03-01), Wilkinson
patent: 2741455 (1956-04-01), Hunter
patent: 3551068 (1970-12-01), Scalzo et al.
patent: 3945758 (1976-03-01), Lee
Ikeda Takashi
Odawara Masachika
Garrett Robert E.
Li H. Edward
Tokyo Shibaura Denki Kabushiki Kaisha
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