Variable shroud for a turbomachine

Details Variable shroud for a turbomachine Variable shroud for a turbomachine

1977-06-24

1978-11-28

Croyle, Carlton R.

Rotary kinetic fluid motors or pumps

With diversely oriented inlet or additional inlet for...

415138, 415170R, 415177, F01D 1108

Patent

active

041273575

ABSTRACT:
A turbine shroud segment is supported by a pair of eccentric shafts which are rotated in response to the engine operating temperatures to selectively vary the radial position of the shroud segment so as to minimize the radial clearance between the shroud segment and the rotatable blades circumscribed therein during variable operating conditions. The bimetal actuator moves in response to changes in the temperature of the cooling air to rotate a ring gear which in turn rotates the eccentric shafts to modulate the radial position of the shroud segment. By proper selection of component design specification and operating parameters, the radial clearance can be minimized during steady-state operating conditions without attendant rubbing during transient operating conditions.

REFERENCES:
patent: 2962256 (1960-11-01), Bishop
patent: 2994472 (1961-08-01), Botje
patent: 3146992 (1964-09-01), Farrell
patent: 3227418 (1966-07-01), West
patent: 3966354 (1976-06-01), Patterson

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