Alstom (Switzerland) Ltd

Abb Alstom Power (Schweiz) Ag

Siegfried Hohmann

Dieter Freuschle

The invention relates to a method and a device for demounting a turbine blade out of an axial groove of a rotor or stator. The turbine blade is demounted with a hydraulic device by means of a hooked slide which is located in a gap between the blade base of the blade root and the groove bottom of the axial groove. At the same time, the hooks of the hooked slide engage into clearances which are located at the blade root.

Method and device for demounting a turbine blade

Moving blades of a fluid-flow machine are fastened in a circumferential slot on the rotor by means of blade roots. For the installation of the last moving blade, a gap is provided between the first and penultimate blade. After the latter has been fitted, a residual gap remains in the circumferential slot, and this residual gap is filled by means of whole intermediate pieces and halved intermediate pieces (,), which are arranged between the moving-blade roots. According to the invention, the inner sides (,) of the halved intermediate pieces (,), which inner sides (,) face the center of the circumferential slot, are of hook-shaped design. In this case, the inner side (,) of one half (,) of a halved intermediate piece forms the geometric negative of the inner side (,) of the other half (,) of the halved intermediate piece. As a result, the two halves (,) can be connected to one another in a positive-locking manner. Axial forces which act on the side walls of the circumferential slot are reduced by this connection, so that the cross section of the halved intermediate pieces (,) can be produced in a rectangular form and consequently more cost-effectively.

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Waldshut, Germany

Siegfried Hohmann