Patent ID: 9062551
Filing Date: 2015-06-23
Classification: F01D

Abstract:
1. A seal for reducing a fluid flow around tips of rotating blades of a turbine, the seal comprising: a plurality of diaphragms disposed in axial succession and providing an outer radial support for a radial arrangement of static blades disposed alternatingly with the rotating blades in an axial direction; a radially inner seal bearing part; a radially outer seal part having axial and radial supports, wherein a ring is located between an axial upstream and axial downstream diaphragm and has a radial support that includes a key and a circumferential extension of the ring, the key and the circumferential extension having a clearance so as to allow a relative radial movement between the ring and a part of a casing or the plurality of diaphragms and providing a pressure sealing face and support in the axial direction between the ring and the casing, and wherein the ring includes a clearance from at least one of the part of the casing and the plurality of diaphragms so as to be isolated from a radial dislocation in an event of a rotation movement of the part of the casing or the plurality of diaphragms; and wherein the axial support is an extension of the outer circumference of the ring and includes an axially oriented face contacting a juxtaposed face in a matching groove in the casing.