FIELD: engines and pumps.
SUBSTANCE: proposed stage comprises impeller 1 and distributor 6 made up of cylindrical casing with bottom 9 and guide vanes 10 on outer surface. Vanes 10 are covered by extra disk 11. Said impeller 1 consists of top and bottom disks 3, 4 with working vanes arranged there between. Impeller 5 is furnished with top and medium seals 7, 8 and bottom seal. Said bottom labyrinth seal is made up of annular collar 12 on impeller bottom disk outer surface and mate recess 13 in bottom 9. Washer 15 inserted in groove of disk 4 is arranged on its outer surface.
EFFECT: higher wear resistance at higher shaft rpm.
2 cl, 1 dwg
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