Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between runner portion and static part – Between blade edge and static part
Patent
1990-07-13
1991-11-12
Look, Edward K.
Rotary kinetic fluid motors or pumps
Bearing, seal, or liner between runner portion and static part
Between blade edge and static part
415 12, 415115, F01D 1100, F01D 2500
Patent
active
050643436
ABSTRACT:
The problem of excessive clearances being generated by rub occurring between the tips of turbine blades and the linings on shroud segments which surround the blades is addressed by way of providing a valve 42 of a metal of different coefficient of expansion than the shroud control ring 24. On ground running prior to take off of an associated aircraft, the valve diverts a cooling airflow away from the ring 24, thus causing it to run hot and expand radially. The shrouds 22 are thus moved away from the blade tips 40 and on take off, are sufficiently far away from the tips 42 as to avoid deep penetration of the lining 38 thereby. The higher temperature generated by take off affects the valve 40 and makes it expand rapidly, to open the cooling airflow paths to the ring 24 via the holes 46 and 50.
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patent: 3814313 (1974-06-01), Beam, Jr. et al.
patent: 3975901 (1976-08-01), Hallinger et al.
patent: 4023731 (1977-05-01), Patterson
patent: 4213296 (1980-07-01), Schwarz
patent: 4730982 (1988-03-01), Kervistin
patent: 4805398 (1989-02-01), Jourdain et al.
patent: 4893984 (1990-01-01), Davison et al.
Lee Michael S.
Look Edward K.
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