| 摘要 |
FIELD: engines and pumps. ^ SUBSTANCE: invention relates to submerged oil well centrifugal pumps. Pump impeller 1 consists of drive plate 2 made integral with hub 3, driven plate 4 and vanes arranged there between. Flow passages are formed between convex side 7 and concave side 8 of adjacent vanes and inner surface of plates 2 and 4. To reduce probability of flow passage clogging in impeller 1 and axial force acting on the latter, through slots are made in plates 2 and 4 between all vanes that are exposed on the side of larger diametre of aforesaid plates. Said slots are formed by convex and concave smoothly merging boundaries. Slot length makes at least half the flow passage length. Note here that one of two said boundaries in each slot 9 is aligned with the side of adjacent vane, the other one being equidistant from said vane. ^ EFFECT: reduced mounting height at invariable pump head, reduced rotor weight, ease of manufacture and higher efficiency. ^ 6 cl, 2 dwg
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