The aerodynamic seal for rotary machines

Japanese Patent JP6190149

B2

An aerodynamic seal assembly (10) for a rotary machine is provided. The assembly includes multiple sealing device segments (12) disposed circumferentially intermediate to a stationary housing and a rotor. Each of the segments includes a shoe plate (14) with a forward-shoe section (26) and an aft-shoe section (28) having multiple labyrinth teeth (16) therebetween facing the rotor. The shoe plate is configured to allow a high pressure fluid to a forward portion of the plurality of the labyrinth teeth and a low pressure fluid to an aft portion of the plurality of the labyrinth teeth and further configured to generate an aerodynamic force between the shoe plate and the rotor. The sealing device segment (12) also includes multiple bellow springs (30, 32) or flexures (31, 33) connected to the shoe plate and to a top interface element (24), wherein the multiple bellow springs or flexures are configured to allow the high pressure fluid to occupy a forward cavity (38) and the low pressure fluid to occupy an aft cavity (40). Further, the sealing device segments (12) include a secondary seal (34) attached to the top interface element at one first end and positioned about the multiple bellow springs or flexures and the shoe plate at one second end.

JPH01318704

SHAFT SEAL DEVICE FOR STEAM TURBINE

Raul Anil Bidker
Massimiliano Chile
Asam Miheel Satte
John Robert Williams

JP2013094875A

August 30, 2017

April 30, 2013

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GENERAL ELECTRIC COMPANY

F01D11/06; F01D11/02; F01D11/08; F02C7/28; F16F1/02; F16J15/06; F16J15/16; F16J15/447

JP62243901A
JP61083403A
JP51111507A

US20110304101
GB2223811A

Arakawa Satoshi
Hirokazu Ogura
Toshihisa Kurokawa
Takuto Tanaka

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