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 nonlinear recurved blades (7) between them. In the disk (1), through holes (5) are made between the input sections of the blades, and on the outer side of the disk (1), there is an annular coaxial hub (2) of the shoulder (6). The wheel is cast with a deviation in the pitch of the blades in their entrance area, no more than 2 mm And at the output section, no more than 3 mm the outer surface of the disc (1) between the hub (2) and the collar (6) is conical, smoothly mated with the hub (2) and the surface of the shoulder (6). The axis of the hole (5) is inclined to the wheel axis at an angle of 25°±5°, The internal diameter of the shoulder (6) is 0.4 to 0.45 of the diameter of the wheel. The holes (5) are arranged around the circumference and their diameter ranges from 0.038 to 0.041 of the diameter of the wheel. The peripheral outer portions of the discs (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 the wheel is from 155 to 157 mm.

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

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