Patent ID: 9010763
Filing Date: 2015-04-21
Classification: F02C,F16J

Abstract:
1. A leaf seal for effecting a seal between two coaxial, relatively rotating components, the leaf seal having a first and second annular pack of stacked leaves forming a pair, each pack being mountable to one of the components with its leaves extending towards the other component such that the leaf edges of at least one of the packs are presented for wiping contact with the other component, and the packs being axially spaced from each other by a controlled axial clearance; wherein within each pack the leaves are stacked face-to-face such that neighbouring leaves are separated from each other by interleaf gaps which allow an axial leakage flow through the seal, and the packs are positioned such that, when viewed in the axial direction, the leaves of each pack of the pair substantially obscure the interleaf gaps of the other pack of the pair; wherein the controlled axial clearance is the dominant flow restriction in the seal determining the amount of leakage flow through the seal; and wherein the leaves of the first pack are a different thickness when viewed in the axial direction than the leaves of the second pack.