Fluid seal

Details Fluid seal Fluid seal

1999-04-20

2000-10-10

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

4151735, 4151736, F01D 1108

Patent

active

061295132

ABSTRACT:
A fluid seal comprises a plurality of seal segments (24) which form a peripheral ring at the tip of turbine rotor blades (20). The upstream end (25) of each seal segment (24) is mounted on the static structure (27). The downstream end (26) of each seal segment (24) is supported by an inner flange (34) on a vane (32). The vane (32) is also provided with a radially outer flange (36) which locates in a radially inclined slot (31) in the casing (30). During engine transients, the vane (32) expands axially forward relative to the casing (30). The outer flange (36) rides up the inclined slot (31) which causes the seal segment (24) to move radially outward and increases the seal clearance. However, during stabilized engine running, the relative axial movement between the casing (30) and the vane (32) is reduced. The outer flange (36) contracts down the inclined slot (31) to move the seal segment (24) radially inwards; the combination reduces the tip clearance and prevents excessive gas leakage.

REFERENCES:
patent: 4459082 (1984-07-01), Niggemann
patent: 4662821 (1987-05-01), Kervistin et al.
patent: 4863345 (1989-09-01), Thompson et al.
patent: 5064343 (1991-11-01), Mills
patent: 5145316 (1992-09-01), Birch
patent: 5399066 (1995-03-01), Ritchie et al.

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