Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Axially extending shroud ring or casing
Patent
1995-09-27
1997-03-18
Larson, James
Fluid reaction surfaces (i.e., impellers)
Rotor having flow confining or deflecting web, shroud or...
Axially extending shroud ring or casing
416198A, 4151737, F01D 1100
Patent
active
056116691
ABSTRACT:
Turbines having rotor blades (3, 5) fixed in dovetail grooves (14) in the rotor periphery have bridge pieces (17) which provide in effect a false floor to the inter-stage recess (8, 11) to close off the machining recess from the fluid path. This invention provides a method of fixing this bridge piece which is simple, positive and avoids loading the rotor disc rims with additional centrifugal force. The dovetail groove (14) for the blade root is continued into a raised portion or the rotor recess periphery. This raised portion is grooved circumferentially (21) and the stem (19) of the `T` section bridge piece fits snugly in the groove. A dovetail section key (23) is inserted through the blade root dovetail groove (14) and into the raised portion of the rotor, passing through a hole in the stem (19) of the bridge piece. The latter is thus positively located and locked in position.
REFERENCES:
patent: 2656147 (1953-10-01), Brownhill et al.
patent: 3551068 (1970-12-01), Scalzo et al.
patent: 4277225 (1981-07-01), Dubois et al.
Eupopean Gas Turbines Limited
Larson James
LandOfFree
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