Patent ID: 7641442
Filing Date: 2010-01-05
Classification: F01D

Abstract:
1. A casing for a turbine, comprising: a support for securing a ring surrounding moving blades of said turbine, said support comprising a circumferential wall coaxially surrounding said ring, said casing including a plurality of perforations enabling air coming systematically from a stage of a compressor to be delivered to a ventilation chamber, and the chamber is configured to allow the air to ventilate an outside face of said circumferential wall in a uniform manner, wherein said plurality of perforations are formed through a wall of said casing that extends radially inwards, said wall substantially enclosing the ventilation chamber that is also defined by an inside face of said casing and by the outside face of said circumferential wall of said support, said chamber including a small opening between a radial rib of the support and the inside face of the radial wall for exhausting the air from the chamber.