{
  "$type": "site.standard.document",
  "description": "A leaf seal is provided for effecting a seal between two coaxial, relatively rotating components. The leaf seal has a pair of annular packs (70) of stacked leaves (72,74). Each pack is mountable to one of the components with its leaves extending towards the other component (76) such that the leaf…",
  "path": "/patents/990718",
  "publishedAt": "2013-05-15T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02C7/28",
    "ROLLS ROYCE PLC [GB]"
  ],
  "textContent": "A leaf seal is provided for effecting a seal between two coaxial, relatively rotating components. The leaf seal has a pair of annular packs (70) of stacked leaves (72,74). Each pack is mountable to one of the components with its leaves extending towards the other component (76) such that the leaf edges of at least one of the packs are presented for wiping contact with the other component. The packs are axially spaced from each other by a controlled axial clearance (g). Within each pack the leaves are stacked face-to-face such that neighbouring leaves are separated from each other by interleaf gaps (h) which allow an axial leakage flow through the seal. Further, within each pack 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. The controlled axial clearance (g) is the dominant flow restriction in the seal determining the amount of leakage flow through the seal.",
  "title": "Leaf seal"
}