Gas turbine vane cooling air insert.

摘要

In a gas turbine having stationary vanes (1) provided with cooling air inserts (14-16) and an impingement plate (24) attached to the outer shroud (2) of the vane (1), the inserts (14-16) extend only a short distance above their mounting surface on the outer shroud (2) so that there is adequate access for properly welding the inserts (14-16) to the outer shroud (2). Insert extensions (20, 21) are disposed in the end of each insert (14-16) so as to form cooling air inlets which project above the impingement plate (24), the insert extension (20, 21) being installed after an insert (14-16) has been welded to the outer shroud (2) so as to not interfere with access to the weld area. The insert extensions (20, 21) are attached to the inserts (14-16) and the impingement plate (24) by flexible seal collars (22-23) forming positive seals between the components.