FIELD: non-displacement compressors and pumps.
SUBSTANCE: impeller comprises a main body with root (1), shroud (2) and plurality of blades (3) connecting the root and the shroud; protection elements (10) are connected to blades (3) and constitute at least the front part of blades (3); protection elements (3) may consist of separate bodies or may be grouped together to form one or more protection bodies; advantageously, 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 %.
EFFECT: material of the impeller is selected as a compromise between erosion resistance of its surfaces and mechanical resistance of its body.
16 cl, 11 dwg
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