US 6,203,271 B1Granted

Shrink ring for turbine with bleeding

AssigneeAsea Brown Boveri AG

InventorsPeter Graf, Tihomir Stojkovic′

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Abstract

The invention relates to a steam turbine, in particular a high-pressure turbine, which is enclosed by an inner casing, split into a top part and a bottom part, and an outer casing. The steam turbine, for the purpose of bleeding, has a bleed slot, which leads form the blade duct of the steam turbine through the inner casing. According to the invention, the inner casing has a shrink ring, which on the one hand holds together the bottom part and the top part of the inner casing and on the other hand forms an annular space above the bleed slot for the purpose of collecting bleed steam and passing it into a pipe connection. The shrink ring has a cavity in its center and flat sides being adapted to the outer surface of the inner casing. The cavity of the shrink ring, together with the outer surface of the inner casing, forms the enclosed, tight annular space. the shrink ring is distinguished by the few components and a short production and assembly time.

Claims7

Dependent claims

A steam turbine, comprising:

an outer casing and an inner casing, which is split along a parting plane into a bottom part and a top part and is held together by means of a plurality of shrink rings, and having a shaft and a blade duct as well as a bleed slot, which leads from the blade duct through the inner casing and through which bleed steam passes into an annular space and flows from there out of the steam turbine through an extraction connection, wherein the inner casing, in a bleed point region, has a combined bleed/shrink ring, which holds together the inner casing and has the annular space in the center of its inner side facing the inner casing, and the combined bleed/shrink ring, on both sides of the cavity, is designed to be flat on its inner side and is adapted there to the contours of the inner casing, and the combined bleed/shrink ring is arranged on the inner casing such that the cavity is positioned above the bleed slot, and at this location the combined bleed/shrink ring together with the outside of the inner casing forms an enclosed and annular space, and bleed steam, which flows from the blade duct through the bleed slot, collects in the annular space and passes from there into an extraction connection.

Dependencies are inferred from the claim text.