Composite shroud and methods for attaching the shroud to plural blades
AssigneeNuovo Pignone S.p.A.
InventorsIacopo Giovannetti, Massimo Giannozzi, Dino Bianchi, Leonardo Tognarelli, Manuele Bigi, Andrea Massini
Life of this patent
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Abstract
An impeller for a turbo-machine and is provided. The impeller includes a metallic base having a central hole, a back surface and a front surface opposite to the back surface; at least one blade extending on the front surface of the metallic base; a composite shroud attached to the at least one blade such that plural closed paths or vanes are formed by the front surface of the metallic base, the at least one blade and the composite shroud; and a connector configured to attach the composite shroud to the metallic base or the at least one blade.
Claims55
An impeller for a turbo-machine, the impeller comprising:
- a metallic base having a central hole, a back surface and a front surface opposite to the back surface;
- at least one blade extending on the front surface of the metallic base;
- a composite shroud attached to the at least one blade such that plural closed paths are formed by the front surface of the metallic base, the at least one blade and the composite shroud;
- and
- a connector configured to attach the composite shroud to the metallic base or the at least one blade.
A method for attaching a composite shroud to an open or closed metallic impeller for a turbo-machine, wherein the impeller comprises a metallic base having a central hole, a back surface, a front surface opposite to the back surface, and at least one blade extending on the front surface of the metallic base, the method comprising:
- contacting the composite shroud with the at least one blade such that plural closed paths are formed by the front surface of the metallic base, the at least one blade and the composite shroud;
- and
- fixing the composite shroud to the metallic base and/or the at least one blade using a connector.
A centrifugal impeller for turbomachinery, made up of a base centrifugal impeller manufactured with at least one first material and comprising a plurality of blades associated with a rear plate, wherein the centrifugal impeller comprises at least one shroud manufactured with a second material different from the at least one first material and associated with the base impeller;
- and a connector configured to attach the at least one shroud to the base or the at least one blade.
A method for making a centrifugal impeller for turbomachinery, the method comprising:
- making a base centrifugal impeller manufactured with at least one first material and comprising at least one plurality of blades associated with a rear plate;
- making at least one shroud manufactured with a second material different from the at least one first material;
- and
- associating the at least one shroud onto the base centrifugal impeller using a connector.
Dependencies are inferred from the claim text.