Turbine and manufacturing method therefor
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsMinoru Ohara, Nobuhiro Kunitake
Life of this patent
Estimating the term…
Abstract
A tip of rotor blade which rotates is an abradable surface. An inner wall of a shroud as a jacket for the rotor blade is an abrasive surface. A part of an abrasive particle protrudes from the abradable surface. When the tip of the rotor blade which rotates contacts the inner wall of the shroud, the protruding section of the abrasive particle slides with the abrasive surface so as to be ground. By doing this, a turbine which can maintain an appropriate clearance between the rotor blade and the shroud and can be used for a long period under high-temperature conditions with easy restoration and remaking thereof.
Claims5
A turbine comprising:
- rotor blades which rotate;
- and
- a shroud as a jacket for the rotor blades, wherein
- either one of a tip of a rotating rotor blade or an inner wall of a shroud has an abrasive surface and the other one has an abradable surface;
- a part of an abrasive particle of the abradable surface protrudes;
- and
- a protruding part of the abrasive particle slides on the abrasive surface and the protruding part of the abrasive particle is worn away when the tip of the rotating rotor blade contacts the inner wall of the shroud.
Dependencies are inferred from the claim text.