Method and apparatus for shaft sealing and for cooling on the ex

Details Method and apparatus for shaft sealing and for cooling on the ex Method and apparatus for shaft sealing and for cooling on the ex

1995-08-03

1996-10-15

Look, Edward K.

Rotary kinetic fluid motors or pumps

Including additional means causing or controlling fluid flow...

415112, F01D 2518

Patent

active

055648967

ABSTRACT:
In a method and an apparatus for shaft sealing and for cooling on the exhaust-gas side of a thermal turbomachine, in particular an axial-flow gas turbine, in which the outlet-side bearing arrangement of the turbine rotor is made inside the exhaust-gas casing construction, and labyrinth seals and a gland are used for the sealing, barrier air having a higher pressure than the pressure of the exhaust gas in the exhaust-gas duct being directed for the shaft sealing into the gland and then into the exhaust-gas duct, and the rotor cooling air being extracted from a compressor stage and being fed via a pipeline through the exhaust-gas-side shaft end into the rotor, a portion of the rotor cooling-air leakage is diverted after some of the labyrinth seals and is used as barrier air. In addition, ambient air is introduced as cooling air into the bearing space, is uniformly distributed at the periphery via the gland separately from the barrier air, is partly used through cooling ducts for specifically cooling the supporting structure and is transported to the outside through passages in the exhaust-gas diffuser.

REFERENCES:
patent: 2463898 (1949-03-01), Moore
patent: 2763462 (1956-09-01), McDowall et al.
patent: 4086759 (1978-05-01), Karstensen et al.
patent: 4217755 (1980-08-01), Williams
patent: 4451200 (1984-05-01), Libertini et al.
patent: 4542623 (1985-09-01), Hovan et al.
patent: 4561246 (1985-12-01), Hovan

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