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

FIELD: engine devices and pumps.

SUBSTANCE: impeller contains a main disk (1) with a hub (2), a cover disc (3) and nonlinear recurved blades (4) between them. In the disk (1), through holes (5) are formed between the inlet portions of the blades (4). The axes of the through holes are parallel to the axis of the impeller. A ring shoulder (6), coaxially surrounding the hub (2), is made on the outer side of the impeller on the disc (1). The outer surface of the disc (1) between the hub (2) and the shoulder (6) is flat, perpendicular to the axis of the impeller and smoothly mated with the inner cylindrical surface of the shoulder (6). The impeller is cast with a deflection in the pitch of the blades (4) in their inlet portion of no more than 2 mm and at the outlet portion - of no more than 3 mm. The internal diameter D1 of the shoulder (6) is from 0.44 to 0.45 of the diameter D2 of the impeller. The holes (5) are located near the concave side of the blade (4) along the circumference with a diameter D3 of 0.32 to 0.34 of D2. The diameter of the holes (5) is from 0.044 to 0.046 of D2. Between the disks (1,3) there are 8 blades (4). 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 impeller is from 226.0 mm to 224 mm.

EFFECT: reduction of the axial force effecting the impeller.

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