DEVICE FOR CORROSION CRACK PREVENTION FOR STEAM TURBINE

PURPOSE:To prevent stress corrosion cracks of a shrinkage fit rotor disc section by opening a vent passage communicating to a low pressure side in an intermediate section of a labyrinth packing provided in the inner circumferential surface of a nozzle diaphragm. CONSTITUTION:A through hole 11a is dr...

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Bibliographische Detailangaben
Hauptverfasser:	SHINOZAKI YUKIO, AKIBA MASAFUMI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING ENGINE PLANTS IN GENERAL HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES STEAM ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	PURPOSE:To prevent stress corrosion cracks of a shrinkage fit rotor disc section by opening a vent passage communicating to a low pressure side in an intermediate section of a labyrinth packing provided in the inner circumferential surface of a nozzle diaphragm. CONSTITUTION:A through hole 11a is drilled in a nozzle diaphragm for a stage which is liable to stress corrosion cracks, one end of which is communicated to an intermediate section of a labyrinth packing 9a provided in the inner circumferential surface of the diaphragm, and the other end to an intermediate section of a labyrinth packing 9b of the following stage by way of a pipe 12. By this constitution, as the temperature of steam flowing from the labyrinth packing 9a into a key groove 4b is reduced to a temperature proportionate to the pressure in the following stage, the steam condensation in the key groove 4b can be prevented so that stress corrosion cracks of a shrinkage fit rotor disc section may be prevented.