Casing arrangement

Details Casing arrangement Casing arrangement

2006-11-28

2006-11-28

Edgar, Richard A. (Department: 3745)

Rotary kinetic fluid motors or pumps

With diversely oriented inlet or additional inlet for...

C415S173100, C415S178000

Reexamination Certificate

active

07140836

ABSTRACT:
A casing arrangement (20) for surrounding a rotary component (16) of a gas turbine engine (10) especially a turbine is disclosed. The arrangement (20) comprises an annular casing member (22A) surrounding a bladed rotary section, such as a turbine stage. An array of gas path liner segments are suspended from the casing at a nominal clearance gap form the tips of the rotary blades. Running clearance is determined by expansion and contraction of the casing which, in turn, is controlled by a supply of heat transfer fluid passed through heat transfer holes in the casing. The casing arrangement described includes a passive pressure bleed effective during engine deceleration to reduce a pressure differential driving the fluid flow in order to avoid too rapid contraction of the casing as a result of overcooling.

REFERENCES:
patent: 3864056 (1975-02-01), Gabriel et al.
patent: 5048288 (1991-09-01), Bessette et al.
patent: 5993150 (1999-11-01), Liotta et al.
patent: 839915 (1960-06-01), None
patent: 1484288 (1977-09-01), None

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