Steam turbine with relief groove on the rotor

US8684663B2 · kind B2 · utility

Assignee

• ALSTOM Technology Ltd · CH

Inventors

• Rabiye Bekyigit · Wald-Michelbach, DE
• Philipp Brunner · Baden, CH
• Jian Chen · Lutterworth, GB
• Rolf Döbler · Schriesheim, DE
• Jozo Drmic · Baden, CH
• Andreas Ehrsam · Ennetbaden, CH
• Maurus Herzog · Brugg, CH
• Davor Kriz · Baden, CH
• Thomas Mokulys · Brugg, CH
• Martin Reigl · Ehrendingen, CH
• Luca Ripamonti · Baden, CH
• Thomas Schreier · Baden, CH
• Giorgio Zanazzi · Baden, CH

Key dates

• Filing date: Sep 29, 2010
• Grant date: Apr 1, 2014
• Expiry date: Dec 24, 2032

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01D25/14
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A steam turbine is provided having a relief groove which is arranged in the region of the equalizing piston and extends in the circumferential direction of the rotor. The relief groove, with regard to an inlet passage, is arranged in the axial upstream direction so that it is arranged on the rotor outside a region in which the steam flow enters the bladed flow path via the inlet passage. The relief groove, with regard to the first blade row, is arranged in a region in which the greatest thermal stresses can arise in the rotor. As an option, the relief groove has a cover for reducing vortex flows, and also devices for reducing heating of the groove or devices for active cooling. The steam turbine allows an increased number of risk-free running up and running down operations of the steam turbine with minimum detriment to the turbine performance.