CENTRIFUGAL PUMP IMPELLER Russian patent published in 2017 - IPC F04D29/22 F04D29/41 

FIELD: engine devices and pumps.

SUBSTANCE: impeller contains the main disk (1) with a hub (2), a cover disc (3) and 7 nonlinear recurved blades (4) placed between them. In the disk (1), through holes (5) are made between the blades input sections, and on the outer side of the disk (1), an annular collar (6) is made coaxial to the hub (2). The outer surface of the disc (1) between the hub (2) and the collar (6) is made flat, perpendicular to the impeller axis and smoothly mated with the inner collar (6) cylindrical surface. The wheel is cast with a deviation in the pitch of blades in their entrance area, no more than 2 mm and at the exit section, no more than 3 mm, the internal collar diameter D1 (6) is from 0.49 to 0.50 of impeller diameter D2. The holes (5) are located near the concave side of the blade (4) along a circle, the diameter of which is 0.35 to 0.36 of impeller diameter D2. The diameter of holes (5) is from 0.041 to 0.043 of impeller diameter D2. The peripheral outer discs parts (1, 3) are formed by conical surfaces, tapering to the periphery of the impeller and the generators of which are inclined to the impeller axis at an angle of 75±5°. The diameter of impeller is from 169 to 167 mm.

EFFECT: reducing the amount of axial force on the impeller that occurs when the pump is running.

2 dwg