Labyrinth seal for rotating shaft

US6575693B2 · kind B2 · utility

Assignee

• ALSTOM (Switzerland) Ltd · CH

Inventors

• Joerg Pross · Albbruck, DE
• Thomas Kramer · Herford, DE
• Ulrich Waltke · Wetter (Ruhr), DE

Key dates

• Filing date: Jun 25, 2001
• Grant date: Jun 10, 2003
• Expiry date: Jun 25, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01D11/02
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Between the rotor and stator of an axial turbo machine, sealing strips of a labyrinth seal that are mortised into sealing strip grooves are provided. Between the sealing strips relief grooves are provided in such a way that the axial stiffness of the rotor or stator is essentially steady. This may be achieved by one or more flat relief grooves, a corrugated surface, or by filling the relief grooves entirely or partially with a suitable, elastic material so that a more even axial tension distribution is achieved between the sealing strip grooves and relief grooves along the rotor or stator section.