FIELD: engines and pumps.
SUBSTANCE: pump stage comprises impeller with hub and distributor consisting of barrel, top disc with axial support, bottom disc and vanes. At least one surface of friction of impeller axial bearings with regular microrelief as islands with rounded and/or flat surface. Space between said islands forms the system of channels which allows the removal of foreign mechanical particles from the surface of friction. Islands of regular microrelief with rounded surface can be composed of bulged spherical identical shape and size segments arranged on rows that make the rings located concentrically relative to impeller axis.
EFFECT: lower costs, decreased weight.
19 cl, 6 dwg
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