Centrifugal compressor hub containment assembly

F - Mech Eng,Light,Heat,Weapons – 01 – D

Patent

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Details

F01D 21/00 (2006.01) F01D 21/04 (2006.01) F01D 25/24 (2006.01) F02C 3/08 (2006.01)

Patent

CA 2206638

To contain high energy fragments generated by a hub burst, a compressor containment assembly in a gas turbine engine includes a diffuser housing having an arcuate portion that defines a channel which traps the high energy fragments and an axial facing U-shaped portion which imparts flexibility. The assembly also includes a concave back shroud having a series of grooves that create resistance for the fragments as they slide along its surface. At its radial outer end the back shroud has an annular rim that absorbs some of the energy and delays the shearing of bolts. A bumper is disposed between the back shroud and a turbine wheel to limit the deflection of the back shroud during a hub burst.

L'invention concerne un assemblage de confinement de moyeu de compresseur dans une turbine à gaz, qui a été conçu pour pouvoir contenir les fragments d'énergie élevée produits par un éclatement de moyeu. L'ensemble est constitué d'un logement de diffusion pourvu d'une partie arquée délimitant un canal qui capte les fragments d'énergie élevée et d'une surface de contact axiale en forme de U qui donne de la flexibilité. L'assemblage comprend également un anneau de renforcement arrière de forme concave pourvu d'une série de rainures qui constituent de la résistance pour les fragments lorsqu'ils se déplacent le long de sa surface. A son extrémité radiale extérieure, l'anneau de renforcement arrière possède un bord annelé qui permet d'absorber une part de l'énergie et de retarder le cisaillement des boulons. Une butée d'amortissement est placée entre l'anneau de renforcement arrière et le rotor de turbine pour limiter le déplacement latéral de l'anneau de renforcement arrière lors d'un éclatement de moyeu.

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