US 2008/0175706 A1 · STEAM TURBINE

Abstract

A steam turbine has: a casing; a rotor rotatably arranged in the casing; a nozzle diaphragm concentrically arranged with respect to the rotor, the nozzle diaphragm being engaged with the casing; moving blades arranged in circumferential direction on outer circumference of the rotor at positions adjacent to the nozzle diaphragm; seal strips circumferentially extending on tips of the moving blades, the seal strips protruding in radial outward direction; and an abradable structure rigidly connected to the nozzle diaphragm. The abradable structure faces the seal strips in radial direction at a facing surface, and has an abradable part made of an abradable material arranged at the facing surface.

Claims9

Dependent claims

A steam turbine comprising:

a casing;
a rotor rotatably arranged in the casing;
at least one nozzle diaphragm substantially concentrically arranged with respect to the rotor, the nozzle diaphragm being engaged with the casing;
a plurality of moving blades arranged in circumferential direction on outer circumference of the rotor at positions adjacent to the nozzle diaphragm;
one or more seal strips circumferentially extending on tips of the moving blades, the seal strips protruding in radial outward direction;
and
an abradable structure rigidly connected to the nozzle diaphragm, the abradable structure facing the seal strips in radial direction at a facing surface and having an abradable part made of an abradable material arranged at the facing surface.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application

11/968,309Filed 2 Jan 2008

Priority

JP 2007-0013259 Jan 2007

Published

24 Jul 2008

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

F01D 25/246
Casings ; Casing parts, e.g. diaphragms, casing fastenings: fastening of diaphragms or stator-rings
F01D 5/3046
Of radial insertion type, e.g. in individual recesses: the rotor having ribs around the circumference
F01D 11/001
Preventing or minimising internal leakage of working-fluid, e.g. between stages: for sealing space between stator blade and rotor
F01D 11/02
Preventing or minimising internal leakage of working-fluid, e.g. between stages: by non-contact sealings, e.g. of labyrinth type

Steam turbine

Life of this patent

Steam turbine

Life of this patent

Abstract

Claims9