Patent Application
20110052376
The present application relates generally to gas turbine engines and aircraft and more particularly relates to a welded inter-stage seal and torque transmission ring.
Multistage turbines generally include a spacing device and an inter-stage seal positioned between the stages. The spacing device maintains a predetermined spacing between each turbine stage. The inter-stage seal prevents leakage of the gas compressed by the preceding stage. Specifically, an inter-stage seal may be located between two rotating disks and may cooperate with a turbine nozzle for providing a fluid seal therebetween to prevent or limit leakages therethrough. Aircraft engines may use similar designs.
Such inter-stage seals, however, may have issues with maintainability and reliability. For example, uneven temperature distributions during operation may result in relatively large tensile forces therein. Such forces may impact life cycle fatigue and even may propagate cracks therein. Moreover, known inter-stage seals generally may be attached to the rotors or elsewhere via bolts or other types of mechanical connection
There is thus a desire for an improved inter-stage seal. Such a seal preferably can provide adequate gas flow sealing and torque transmission while being easy to install and relatively light weight.
The present application thus describes a turbine section. The turbine section may include a pair of rotors, a seal ring positioned between the pair of rotors, and a first weld at a first end of the seal ring and a second weld at a second end of the seal ring.
The present application further provides for a turbine section of a gas turbine engine. The turbine section may include a pair of rotors spaced apart from each other, a seal ring positioned between the pair of rotors, a first weld at a first end of the seal ring and a second weld at a second end of the seal ring, and a number of teeth positioned on the seal ring.
These and other features of the present application will become apparent to one of ordinary skill in the art upon review of the following detailed description when taken in conjunction with the several drawings and the appended claims.
Referring now to the drawings, in which like numbers refer to like elements throughout the several views,
The turbine section 100 further may include a seal ring 160 as is described herein. The seal ring 160 may be attached to the first rotor disk 110 at a first end 170 thereof and to the second rotor disk 120 at a second end 180 thereof. The seal ring 160 may be attached at the first end 170 via a first weld 190 and at the second end 180 via a second weld 195. Other types of connection means maybe used herein. The welds 190, 195 may be continuous or intermittent. The seal ring 160 may include any number of labyrinth teeth 200 or similar types of seals. The labyrinth teeth 200 may be positioned so as to face the stator 150. Any number of labyrinth teeth 200 may be used. The labyrinth teeth 200 may have any desire size or shape.
In use, the seal ring 160 adequately prevents leakage via the use of the labyrinth teeth 200. The seal ring 160 itself also transmits torque therethrough. The use of the welds 190, 195 eliminates the nuts and bolts as used in known designs so as to provide a light weight design. The seal ring 160 further eliminates the use of the spacer so as to further reduce the costs and weight of the overall turbine 40. Further, seal displacements thus can be minimized so as to provide better clearance. Overall costs likewise may be reduced given the use of fewer parts. The seal ring 160 may be used between any type of rotating parts.
It should be apparent that the foregoing relates only to certain embodiments of the present application and that numerous changes and modifications may be made herein by one of ordinary skill in the art without departing from the general spirit and scope of the invention as defined by the following claims and the equivalents thereof.
