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1. 发明专利

JPH0719005A LABYRINTH SEAL DEVICE 失效
公开(公告)号：JPH0719005A
公开(公告)日：1995-01-20
申请号：JP16239693
申请日：1993-06-30
申请人： TOSHIBA CORP
发明人： HISA SHIYOUICHI , HARADA TOSHIYUKI
IPC分类号： F01D11/02 , F01D11/04
摘要： PURPOSE:To prevent self-excited oscillation by providing communication between fins of first line and second line located upstream from a stationary part outside range by means of a plurality of transmission holes degined to have a prescribed angle to the tangential line of a rotor, forcing bleed steam to pass through the transmission holes, and making bleed steam to flow-in between the fins in the direction opposite to turning flow around the rotor. CONSTITUTION:Seal fins 21 are implanted along a seal ring 22, and the top ends thereof are extended toward a rotor 1. A chamber 24 formed between the first line and the second line of the seal fin 21 and the outer side range of the seal ring 22 are communicated with each other through at least four transmission holes 25. Turning flow shown by an arrow W is generated in the chamber 24 by means of rotation of the rotor 1 in T direction, but when bleed steam bled in the outside range of the seal ring 22 is passed through transmission holes 25 and then it flows in direction shown by an arrow Wb, turning flow in the direction shown by the arrow W collides with the abovementioned flow, and moving component in rotational direction is lost so as to form pressure distribution in which only pressure downward in vertical direction makes it action. Therefore, excited oscillation force in a turbine shaft system is not added so as to stabilize an axial system.

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