Methods and apparatus for reducing inlet sleeve vibration

Rotary kinetic fluid motors or pumps – Including thermal expansion joint

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415108, F01D 2526

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active

051526654

ABSTRACT:
The present invention substantially reduces the likelihood of cracking failure occurring in the inlet sleeves which connect a steam source to the outer cylinder of a steam turbine. The present invention eliminates the excessive vibration which is the fundamental cause of cyclic stresses which cause fatigue cracking. The present invention minimizes vibration by limiting the amplitude of the sleeve's oscillations of the inlet sleeve by preferably restraining the sleeve within a structure such as a disc having grooves cut therein which engage splines formed on the inlet sleeve. The present invention provides sufficient clearance for installation but reduces the amplitude of radial oscillations. The present invention thus allows free vertical and radial sleeve movement of the inlet sleeve, but limits random vibration that caused highcycle vibrations. The present invention limits sleeve vibration in all directions, but does not introduce undesirable thermal stresses, while providing adequate cold clearance for installation ease. Methods of assembling steam turbines are also disclosed.

REFERENCES:
patent: 3628878 (1971-12-01), Trassel et al.
patent: 4029432 (1977-06-01), Meylan et al.
patent: 4177003 (1979-12-01), Remberg et al.
patent: 4362464 (1982-12-01), Stock
patent: 4832566 (1989-05-01), Martin
patent: 5037270 (1991-08-01), Bangel et al.

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