| 摘要 |
<p>A leaf seal 131 between first 134 and second 51 coaxial components which rotate about a common axis 52, the seal having an annular pack 50 of stacked leaves 132 between a pair of axially spaced cover plates. The cover plates are characterised by a rubbing material 139 which makes contact with the second component during rotation. Preferably the rubbing material is an abradable, wearable or deformable layer. The cover plates 135a, 135b and the leaves 132 are mountable to the first component, extending radially towards the second component. In use, a pressure drop is maintained axially across the leaf stack 50. The free edge of either one or both of the cover plates may be defined by the rubbing material. The cover plates may either be flexible to deflect is use when in contact with the second component, or they may be rigid. In one embodiment one cover plate is flexible and the other cover plate is rigid to resist deflection in use. Preferably the cover plate presents a sharp, pointed or rounded rubbing edge to the second component. In the embodiment the seal is used in a gas turbine and the second component is a rotor.</p> |
