FIELD: engines and pumps.
SUBSTANCE: invention refers to pump building industry, and namely to multi-stage centrifugal oil production pumps. Centrifugal pump stage includes guide vane 1 fixed in housing 2 and impeller installed on drive shaft 3 of pump. Impeller consists of drive and driven discs 4, 5 with working blades 5a between them. Drive and driven discs 4, 5 of impeller at the inlet and outlet are provided with side annular protrusions 6 and 7, 8 and 9 directed in pairs to each other so that annular slots "a" and "b" are formed at inlet and outlet of impellers.
EFFECT: increasing the head and efficiency, increasing life time of pump within marginal oil production.
2 dwg
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