Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between runner portion and static part – Between blade edge and static part
Patent
1983-12-30
1997-01-14
Bentley, Stephen C.
Rotary kinetic fluid motors or pumps
Bearing, seal, or liner between runner portion and static part
Between blade edge and static part
415116, F01D 1108
Patent
active
055932789
ABSTRACT:
The disclosed invention relates to a sealing device for the rotor blades of a gas turbine engine which permits real time adjustment to be made of the clearances between the rotor blade tips and the sealing structure. The sealing shroud around the turbine wheel is formed of sectors, each sector being attached to a monolithic short response time ring and a monolithic long response time ring. Ventilating air from upstream of the turbine wheel is directed onto the rings such that the sectors are caused to radially expand or contract in compliance with the expansion or contraction of the tips of the rotor blades during stabilized and transient engine operational modes. A small positive clearance between the sealing sectors and the blade tips is maintained throughout the range of the engine's operation.
REFERENCES:
patent: 4050843 (1977-09-01), Needham
patent: 4304093 (1981-12-01), Schulze
patent: 4363599 (1982-12-01), Cline
patent: 4487016 (1984-12-01), Schwarz
patent: 4513567 (1985-04-01), Deveau
Jourdain Gerard E. A.
LaGrange Jean-Paul
Mandet Gerard M. F.
Mouchel Jacques H.
Richard Jean-Philippe E.
Bentley Stephen C.
Societe National d'Etude et de Construction de Moteurs d'Aviatio
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