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Title: Turbine interstage seal with self-balancing capability

An interstage seal for a turbine of a gas turbine engine, the interstage seal having a seal carrier with an axial extending seal tooth movable with a stator of the engine, and a rotor with a seal surface that forms the interstage seal with the seal tooth, where a magnetic force produced by two magnets and a gas force produced by a gas pressure acting on the seal carrier forms a balancing force to maintain a close clearance of the seal without the seal tooth contacting the rotor seal surfaces during engine operation. In other embodiments, two pairs of magnets produce first and second magnetic forces that balance the seal in the engine.
Inventors:
; ;
Issue Date:
OSTI Identifier:
1399246
Assignee:
FLORIDA TURBINE TECHNOLOGIES, INC. CHO
Patent Number(s):
9,771,821
Application Number:
14/739,536
Contract Number:
SC0008218
Resource Relation:
Patent File Date: 2015 Jun 15
Research Org:
FLORIDA TURBINE TECHNOLOGIES, INC., Jupiter, FL (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 33 ADVANCED PROPULSION SYSTEMS

Other works cited in this record:

Shaft seal with positively magnetically controlled sealing gap
patent, May 1984

Permanent magnet floating shaft seal
patent, August 1992

Magnetic seal
patent, November 1992

Seal arrangement
patent, April 2001

Seal apparatus
patent, July 2007

Magnetically-controlled rotary seal
patent, October 2011

System and method for clearance control
patent, May 2012

Airtight magnetic seal for bearing casings
patent, June 2012

Pump with magnetic bearings
patent, April 2014

Seal apparatus
patent-application, May 2002

Sealing arrangements
patent-application, February 2017

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