Importance

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Abstract

An HP module for a turbine having a drum rotor with admission for steam having very high pressure and temperature characteristics comprises zones of different designs that are suitable for different temperature and pressure levels. An anterior zone A is at the steam admission end and includes a rotor assembly, diaphragms, an internal body, and an admission baffle carrier all of which are fully isotrophic, without any break in a horizontal join plane. A posterior zone P situated at the exhaust end has its internal body implemented in the form of two portions which are coupled to the internal body of the zone A. The internal body of the zone P may be isotropic and banded or it may be non-isotropic or it may be bolted. In the zone A the blades are mounted either in axial grooves or else in circumferential grooves, whereas in the zone P, the grooves are selected to be circumferential for simplification purposes. The advantage of the invention lies in a reduction in the transverse size of the module due: to the drum rotor; to the isotropic anterior interior body; and to elimination of the third envelope at the admission end.

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First Claim