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US 2006/0222499 A1Published application
Spigot arrangement for a split impeller
AssigneePratt & Whitney Canada Corp.
InventorsRaman Warikoo, Peter Stanculet, Farid Abrari
Life of this patent
Estimating the term…
Abstract
A spigot arrangement for split impeller (inducer and exducer) includes a recess of the exducer and means for reducing exducer blade root stresses and localized contact stresses between inducer and exducer.
Claims16
A split impeller assembly for a gas turbine engine, the split impeller having inducer and exducer bodies matingly mounted to one another at respective rear and front faces, the split impeller assembly further comprising:
- a central recess co-axially defined in the front face of the exducer body, the recess having an inwardly extending radial surface spaced apart from the front face;
- and
- an annular spigot protruding axially from of the rear face of the inducer body, the spigot being received in the recess, the spigot having a terminal radial surface spaced apart from the rear face, in order to contact the inwardly extending radial surface of the recess of the exducer body such that the rear face of the inducer body and the front face of the exducer body are spaced apart to form a gap therebetween.
(canceled)
An impeller of a gas turbine engine comprises:
- an axial-flow rotor portion having a first array of blades extending outwardly from a first disc body thereof, the first disc body including an annular spigot protruding axially from a rear end thereof and being co-axial with the axial-flow rotor portion;
- and
- a centrifugal rotor portion having a second array of blades extending outwardly from a second disc body thereof, the second disc body including a recess defined in an upstream side of the second disc body for snugly accommodating the annular spigot of the first disc body, the second disc body including means for reducing localized contact stresses between the first and second disc bodies when local distortion of the disc bodies occurs during engine operation.
A split impeller assembly of a gas turbine engine comprising
- an inducer body having a downstream disc face and a first axial contact face spaced axially downstream from said downstream face, the first axial contact face disposed radially inside a peripheral portion of said downstream disc face;
- and
- an exducer body having an upstream disc face and a second axial contact face spaced axially downstream from said upstream face, the second axial contact face disposed radially inside a peripheral portion of said upstream disc face, wherein when said inducer and exducer bodies are mounted together said first and second axial contact faces contact one another and said peripheral portions of said downstream and upstream disc faces are spaced apart from one another.
Dependencies are inferred from the claim text.