Patent ID: 8998565
Filing Date: 2015-04-07
Classification: F01D

Abstract:
1. An apparatus configured to seal with a turbine blade stage of a gas turbine, the apparatus comprising: a casing that at least partially encloses the gas turbine; an outer shroud configured to be coupled to the casing and circumferentially surround the turbine blade stage; and an inner shroud configured to circumferentially surround the turbine blade stage to seal with the turbine blade stage and comprising an attachment element configured to be inserted into the outer shroud to couple the inner shroud to the outer shroud, the inner shroud defining a void internal to the inner shroud; wherein the outer shroud and the inner shroud form a cavity that is in fluid communication with a purge gas supply attached to the casing and supplying cool gas such that the cavity is cooled by the cool gas purging the casing, the cavity being in communication with the attachment element.