F - Mech Eng,Light,Heat,Weapons – 01 – D
Patent
F - Mech Eng,Light,Heat,Weapons
01
D
F01D 25/04 (2006.01) F01D 9/02 (2006.01) F01D 9/06 (2006.01)
Patent
CA 2058324
56,204 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 prevnt invention thus allows free vertical and radial sleeve movement of the inlet sleeve, but limit random vibration that caused high- cycle 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.
Bereskin & Parr
Westinghouse Electric Corporation
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