FIELD: engines and pumps.
SUBSTANCE: pump stage comprises impeller 1 with sleeve 2 and guide vanes 4 made up of top plate 5 with axial bearing 6, bottom plate 8 and vanes 10. Top plate 5 with axial bearing 6 is fitted on outer sleeve and made from polymer material. Minimum ID of outer sleeve 7 makes, at least, 70% of its OD. Top plate 5 and outer sleeve 7 are produced from different materials.
EFFECT: longer life in operation on formation fluids with increased content of salts, free gas and mechanical impurities.
8 cl, 6 dwg
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