Blade root seal

Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Axially extending shroud ring or casing

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Details

415172A, 416174, 416241A, F01D 530

Patent

active

044228279

ABSTRACT:
The neck portion of a rotor blade includes an annular, axially projecting segment integral with the neck and having side edges abutting corresponding segments of adjacent blades to form a segmented annular ring which cooperates with static structure to define an interstage annular seal. Each blade also includes an air dam extending laterally from each side of the root neck and extending radially between the blade platform and the annular seal segment. The air dams of adjacent blades also abut each other to define an annular seal which prevents the axial flow of air across the rotor stage under the blade platforms between the blade root necks. In a preferred embodiment thin strips of silicone rubber are used to seal any gaps between the abutting edges of adjacent blades.

REFERENCES:
patent: 3137478 (1964-06-01), Farrell
patent: 3628885 (1971-12-01), Sidenstick et al.
patent: 3719431 (1973-03-01), Steele et al.
patent: 3810711 (1974-05-01), Emmerson et al.
patent: 3853425 (1974-12-01), Scaizo et al.
patent: 4218189 (1980-08-01), Pask

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