专利汇可以提供Small radial profile shroud for variable vane structure in a gas turbine engine专利检索,专利查询,专利分析的服务。并且A shroud for supporting a variable vane in a compressor section for a gas turbine engine includes a pair of components which are secured together by a threaded fastener extending into a blind hole in one of the two components. Additional material forms on the component which includes the blind hole extends beyond a pivot axis for the vane such that there is an increased length of engagement between the threaded fastener and the blind hole. The blind hole eliminates the need for multiple nuts and reduces the radial height of the shroud to save additional weight.,下面是Small radial profile shroud for variable vane structure in a gas turbine engine专利的具体信息内容。
What is claimed is:
This application relates to a shroud for a variable vane structure in a gas turbine engine, wherein the shroud is formed of two components connected together by a threaded fastener extending into a blind hole in one of the two components.
Gas turbine engines are known, and have a plurality of sections. Typically, a compressor section receives air and compresses that air. The air is delivered downstream to a combustor, and is mixed with fuel. The air and fuel is combusted, and the products of combustion are passed downstream over turbine rotors. The turbine rotors are driven to rotate.
The compressor section typically includes a plurality of rotor stages and intermediate stationary vane stages. The rotor stages each include a plurality of blades which have airfoils to receive and compress air, and deliver that air downstream. Intermediate each stage of rotor blades are stationary vanes. Under certain conditions it is desirable to redirect the airflow between the compression stages. Thus, the vanes have a variable profile, and may be caused to rotate on a pivot axis to control the direction of air from one compression stage as it approaches the next compression stage.
Such variable vanes are mounted in inner and outer shrouds. In the prior art, at least some of these shrouds have been formed of at least two separate components which meet along a flat mating surface at the pivot axis of the vane. This prior art structure has included a hole extending through both components. A threaded fastener, such as a bolt, extends through the hole, and a nut is secured at an opposed end of the hole. This structure requires a relatively great radial profile for the shroud, due to the nut.
In a disclosed embodiment of this invention, the shroud for a variable vane is formed of two components. A threaded fastener extends through a hole in one of the components, and into a blind hole in the other. The use of the blind hole provides a much smaller radial envelope for the combined shroud and eliminates the need for multiple nuts to save additional weight. In one feature of the disclosed embodiment, the component which includes the blind hole has at least a portion extending beyond the pivot axis for the vane such that there is a good deal of additional material to receive the blind hole.
These and other features of the present invention can be best understood from the following specification and drawings, the following of which is a brief description.
A compressor section 18 for a gas turbine engine is illustrated in
As known, a shroud 30 secures an inner peripheral portion of the vane 26, and supports it for pivotal movement. An outer trunnion 134 of the vane 26 is driven to pivot by a linkage 33 connected to an actuator 34. As is known, the vane 26 is a variable vane, and can be caused to pivot based upon operational conditions to control the direction of air delivered from one compressor stage to the downstream compressor stage. The times when such pivotal movement is desirable are within the level or ordinary skill in the art. This application relates to the inner shroud arrangement, and not to the movement of the vane 26 itself.
As shown in
As shown in
Although a preferred embodiment of this invention has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this invention. For that reason, the following claims should be studied to determine the true scope and content of this invention.
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