RADIAL DIFFUSER OF MULTI-STAGE SUBMERSIBLE PUMP Russian patent published in 2011 - IPC F04D29/44 F04D13/10 

FIELD: engines and pumps.

SUBSTANCE: diffuser includes cylindrical housing, one or two flow passages, upper disc and lower disc having cavity for impeller 6 and equipped with cover 8. Centre of cavity is offset relative to axis of cylindrical housing of diffuser. Spiral outlet 9 made in cover 8 and back channel, which are connected through inclined channel, form flow passage of diffuser. Inclined channels are made between inserts 11 and 12 and located in parts of lower disc and cover 8, which are located at maximum distance from cavity symmetry axis.

EFFECT: invention provides improved head characteristics and allows increasing the width of inclined channels within the limits of the specified dimensions without decreasing the diametre of wheel.

4 cl, 9 dwg