A gas turbine including multiple sealing ring packs

摘要

A gas turbine includes a rotatable first element 11 contained in a bore of a relatively static second element 10 and sealing ring pack 16 located in a groove 17 on the first element 11 to seal against the second element 10. The sealing ring pack 16 comprises a number (n) of active rings 18 and (n + 1) passive rings 19, wherein each active ring 18 is located and retained between a pair of passive rings 19. The side faces of each active ring 18 are in sliding contact with respective pairs of passive rings 19 wherein the groove is dimensioned to allow axial thermal expansion of the rings.