Blade tip clearance control

Rotary kinetic fluid motors or pumps – With lubricating – sealing – packing or bearing means having... – For shaft sealing – packing – lubricating or bearing means

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Details

415171, F01D 1100

Patent

active

042472474

ABSTRACT:
A turbine blade tip seal assembly for controlling the blade tip clearance between a flexible outer shroud and the tips of a thermally expansible row of turbine blades on a turbine rotor includes a fixed outer shroud with a pressure deflectable wall portion thereon located in surrounding, radially outwardly relationship with blade tips on the blades of a turbine rotor and wherein an excessive blade tip to shroud wall spacing is maintained when the engine is at cold start conditions; said turbine blades of the turbine rotor expanding in response to increases in operating temperature within the engine during turbine engine operation to partially close the excessive blade tip to shroud clearance and further including pressurizable means responsive to turbine operation to produce pressure bias on the deflectable wall to cause it to be deflected raidally inwardly to further reduce the excessive blade tip clearance so as to produce a resultant operative clearance between the tip of the turbine rotor and the shroud to prevent excessive gas bypass between the wall and the blade tips; said pressurizable means including a secondary pressurizable chamber responsive to engine operating conditions to apply a secondary pressure on the wall to produce a fine-tuned adjustment of the blade tip clearances between leading and trailing edges of the blades when the engine has reached an elevated equilibrium temperature of operation.

REFERENCES:
patent: 2686657 (1954-08-01), Kalitinsky
patent: 2927724 (1960-03-01), Wardle
patent: 2994472 (1961-08-01), Botje
patent: 3039737 (1962-06-01), Kolthoff
patent: 3834001 (1974-09-01), Carroll et al.
patent: 3860358 (1975-01-01), Cavicchi et al.

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