Temperature activated expanding mineral shim

Details Temperature activated expanding mineral shim Temperature activated expanding mineral shim

1990-01-22

1992-02-11

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Specific working member mount

Blade received in well or slot

416241R, 2988921, 403374, F01D 530

Patent

active

050871749

ABSTRACT:
A method and apparatus for securing or attaching a rotor blade with a turbine rotor cavity by disposing an expanding material between the blade root and the cavity walls. The expanding material comprises a naturally occurring mineral which expands to a great degree when exposed to elevated temperatures. The expanding material may be provided in the form of shims made directly from the expanding material or made from a composition of the expanding material and a binder such as a polymer or elastomer. Alternatively, the expanding material may be provided in the form of a liquid vehicle applied to surfaces of the cavity walls. The expanding material is located at specific positions within the cavity to urge certain surfaces of the blade root against certain surfaces of the cavity walls. In this manner, the blade can be forced into a tight fit and an aligned position, with respect to the rotor, upon expansion of the expanding material.

REFERENCES:
patent: 3317988 (1967-05-01), Endres
patent: 3323394 (1972-04-01), Hoffmuller et al.
patent: 3784320 (1974-01-01), Rossmann et al.
patent: 3910719 (1975-10-01), Hessler et al.
patent: 4169694 (1979-10-01), Sanday
patent: 4417854 (1983-11-01), Cain et al.
patent: 4790723 (1988-12-01), Wilson et al.

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