公开(公告)号：US09803483B2

公开(公告)日：2017-10-31

申请号：US14925059

申请日：2015-10-28

Applicant: ALSTOM Technology Ltd

Inventor： Rolf Hunziker ,  Krzysztof Cherek ,  Sigurd Kubel

IPC: F01D5/28 ,  F01D5/14

CPC classification number: F01D5/28 ,  F01D5/147 ,  F01D5/282 ,  F01D5/286 ,  F05D2250/38

Abstract: The invention relates to sheath for a blade that has a uniform assembly direction over the radial height of the sheath whether the blade has a straight or curved trajectory. This is achieved by the a sheath formed around the edge, having a first inner surface wherein a first tangential vector projected tangentially to the first inner surface in a direction away from the head portion in an longitudinal plain forms a first angle with the rotational axis that does not vary over the radial height of the sheath while a second tangential vector projected tangentially from any point of the second inner surface of the sheath in a direction towards the head portion intersects the first tangential vector.