Impeller with protection elements and centrifugal compressor
AssigneeNuovo Pignone S.p.A.
InventorsMichelangelo Bellaci, Andrea Massini, Massimo Giannozzi, Iacopo Giovannetti
Life of this patent
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Abstract
The impeller includes a main body with a root, a shroud and a plurality of blades connecting the root and the shroud. Protection elements are associated to the blades and constitute at least the front part of the blades. The protection elements may consist of separate bodies or may be grouped together to form one or more protection bodies. In an embodiment, the material of the protection elements is different from the material of the main body, and may be, for example, a cobalt base alloy having a chromium content greater than 20% or nickel base alloy having a chromium content greater than 12%.
Claims12
An impeller comprising:
- a main body with a root defining a front part;
- a shroud defining a front part;
- a plurality of blades connecting the root and the shroud, each blade of the plurality of blades comprising a leading edge and a front part including the leading edge and a segment of the blade extending a distance from the leading edge;
- and
- a plurality of protection elements, each protection element of the plurality of protection elements defining a single piece body comprising a blade portion associated with a corresponding blade of the plurality blades and constitutes at least the front part of said corresponding blade, a root portion forming at least partially the front part of the root and a shroud portion forming at least partially the front part of the shroud,
- wherein the plurality of protection elements are adjacent relative to each other so that, internally, the front part of the shroud is entirely made by the plurality of protection elements.
Dependencies are inferred from the claim text.