IMPELLER OF CENTRIFUGAL FAN Russian patent published in 1994 - IPC

FIELD: fan making. SUBSTANCE: between bearing and covering discs there are positioned blades. Each of them is provided with protective strap located on working surface bent with at least one end on nonworking surface and produced from wear-resistant material with protrusions. Section of strap on side of bearing disc is bent to surface of disc in zone of its contact with working surface of blade. At least one layer of wear-resistant adhesive material is applied between strap and surfaces of impeller located under it. Protrusions are located transverse to strap and the latter is provided with rows of holes uniformly arranged between protrusions. EFFECT: prolonged operational life and expanded working capabilities. 4 cl, 3 dwg