초록 ▼

A segmented turbine vane nozzle assembly for a steam turbine has an inner ring and a plurality of vanes with each vane having a base end and a profile tip and a profile tip trailing edge extension portion and each vane base end being attached to the inner ring and extending radially therefrom. An an

A segmented turbine vane nozzle assembly for a steam turbine has an inner ring and a plurality of vanes with each vane having a base end and a profile tip and a profile tip trailing edge extension portion and each vane base end being attached to the inner ring and extending radially therefrom. An annular outer ring has a plurality of arcuate grooves of predetermined depth therein. The outer ring is mounted concentrically with the inner ring. Each vane profile tip trailing edge extension portion extends into one outer ring arcuate groove. Each of the vane profile tips leading edge portion is attached to the outer ring so that a vane assembly is formed without welding the profile tip trailing edge of the vanes. This reduces flow leakage and the formation of erosion caused by the formation and release of large droplets. A method of making a segmented turbine vane nozzle assembly is also disclosed.

대표청구항 ▼

A method of making a segmented turbine vane nozzle assembly comprising the steps of: forming a plurality of vanes, each vane having a base and a profile tip having a trailing edge extension; forming an inner ring for supporting said plurality of vanes thereon; forming an annular outer ring having a

A method of making a segmented turbine vane nozzle assembly comprising the steps of: forming a plurality of vanes, each vane having a base and a profile tip having a trailing edge extension; forming an inner ring for supporting said plurality of vanes thereon; forming an annular outer ring having a plurality of arcuate grooves on the inside thereof; positioning the trailing edge extension of each vane profile tip of said plurality of vanes in one of said arcuate groove in said outer ring; and welding a leading edge portion of each said vane to said outer ring, whereby a vane assembly is formed without welding the profile tip extension of the vanes.