Abstract: A centrifugal compressor wheel including a metal hub (2) for connecting to a drive shaft (3), an inlet plate (4) and an outlet plate (5) fixed to the metal hub (2), and a plurality of blades (7), each blade having a beginning and a peripheral portion (7b), fixed between the inner plate (4) and the outer plate (5). The wheel further includes an annular metal insert (8) integrated in the central portion of the wheel at a periphery of the hub (2), the annular metal insert (8) having metal elements (7A) forming the beginnings of the blades of the wheel. The inlet plate (4), the outlet plate (5), and the peripheral portions (7B) of the blades are made of a composite material, thereby constituting a composite portion of the wheel.

Abstract: A centrifugal compressor wheel including a metal hub (2) for connecting to a drive shaft (3), an inlet plate (4) and an outlet plate (5) fixed to the metal hub (2), and a plurality of blades (7), each blade having a beginning and a peripheral portion (7b), fixed between the inner plate (4) and the outer plate (5). The wheel further includes an annular metal insert (8) integrated in the central portion of the wheel at a periphery of the hub (2), the annular metal insert (8) having metal elements (7A) forming the beginnings of the blades of the wheel. The inlet plate (4), the outlet plate (5), and the peripheral portions (7B) of the blades are made of a composite material, thereby constituting a composite portion of the wheel.

Abstract: An impeller is disclosed including a number of vanes, first and second coaxial disks formed from composite material on opposite sides of the vanes to fix the vanes in position, so that the impeller can rotate on an axis of rotation, and at least one reinforcing collar disposed coaxially with and adjacent to the axis of rotation to provide an interior collar, the at least one reinforcing collar comprising reinforcing fibers, such as carbon fibers.