公开(公告)号：US4657479A

公开(公告)日：1987-04-14

申请号：US783159

申请日：1985-10-02

申请人： Michael Brown ,  Sharon P. Martin ,  Andrew Seaton ,  Phillip J. Snowsill ,  Mark S. Thomas ,  Hywel Williams

发明人： Michael Brown ,  Sharon P. Martin ,  Andrew Seaton ,  Phillip J. Snowsill ,  Mark S. Thomas ,  Hywel Williams

IPC分类号： F01D11/08

CPC分类号： F01D11/08 ,  F05D2250/13

摘要： A shroud for a gas turbine engine rotor stage is divided into a number of arcuate segments each of which is a trapezium. The segments are urged together by compression springs which attempts to make the assembly lengthen peripherally, by virtue of the chamfered ends 30 of the segments riding up each other. The completely circular shape of the shroud prevents that movement but as a result, a hoop load is generated which tends to move the segments radially outwards, thus achieving the same effect, along with a consequent increase in diameter. A cam ring and pins are used to control and reverse the movement, as desired. The shroud diameter can thus be altered to suit rotor expansion and contraction.

摘要翻译： 用于燃气涡轮发动机转子级的护罩被分成多个弓形段，每个弧形段是梯形。 通过压缩弹簧将片段一起推压在一起，这些压缩弹簧试图使组件在周边上延长，这是由于这些部分的倒角端部30相互靠在一起。 护罩的完全圆形形状防止了这种移动，但是结果产生了环向负载，其倾向于使节段径向向外移动，从而获得相同的效果，随之而言直径增加。 根据需要，凸轮环和销用于控制和反转运动。 因此，可以改变护罩直径以适应转子的膨胀和收缩。