Shroud gap control for integral shrouded blades

Details Shroud gap control for integral shrouded blades Shroud gap control for integral shrouded blades

1987-12-24

1989-03-28

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Axially extending shroud ring or casing

416191, F01D 516, F01D 0522

Patent

active

048159387

ABSTRACT:
In turbines, gaps arising between adjacent shrouds of integrally shrouded blades at high temperature are controlled or eliminated using pins inserted into opposing faces of shroud portions. These pins have a coefficient of thermal expansion greater than the integrally shrouded blade material and at least equal to that of the rotor material and, thus, protrude outwardly at operating temperatures. These protruding pins act to close the gap between shroud portions, thereby reducing vibration.

REFERENCES:
patent: 2430140 (1947-11-01), Phelan et al.
patent: 3576377 (1971-04-01), Beanland et al.
patent: 3938906 (1976-02-01), Michel et al.
patent: 3981615 (1976-09-01), Krol
patent: 4257743 (1981-03-01), Fujii
patent: 4533298 (1985-08-01), Partington et al.
patent: 4602412 (1986-07-01), Partington et al.
patent: 4722668 (1988-02-01), Novacek

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