Steam turbine

Details Steam turbine Steam turbine

2006-02-06

2008-07-22

Edgar, Richard (Department: 3745)

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Casing with mounting means

C415S214100

Reexamination Certificate

active

07402024

ABSTRACT:
A steam turbine (20), in particular for high pressure and/or intermediate pressure applications, has a rotor (11), which can rotate about an axis (23), an inner casing (14), which concentrically surrounds the rotor (11) at a distance, so as to form an annular passage (12) extending in the axial direction, and an outer casing (13), which concentrically surrounds the inner casing (14) at a distance so as to form an annular intermediate space (16) extending in the axial direction, blading including rotor blades (21) and guide vanes (22) being provided in the annular passage (12), and the annular passage (12), on the outlet side, being in communication with the intermediate space (16) in order for the steam to be passed on, and the inner casing (14) also being externally surrounded by a plurality of shrink rings (15), which are arranged one behind the other in the axial direction and project into the intermediate space (16). In a steam turbine of this type, the aerodynamics are improved by virtue of the fact that a device (24) is provided for leveling the finned structure produced by the shrink rings (15) on the outer side of the inner casing (14), in such a manner that the annular intermediate space (16) is delimited on the inner side by a continuously smooth inner surface which is favorable in terms of fluid dynamics.

REFERENCES:
patent: 6572328 (2003-06-01), Tremmel et al.
patent: 3420389 (1985-12-01), None
patent: 0965732 (1999-12-01), None
Busse, L., et al., “World's highest capacity steam turbosets for the lignite-fired Lippendorf power station,” ABB Review 1997, pp. 13-22, Bd. 63, Nr. 6, ABB Asea Brown Boveri, Zurich Switzerland.
Search Report for Swiss Patent App. No. CH 2732005, dated May 20, 2005.

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