FIELD: pumps.
SUBSTANCE: group of inventions relates to pumping device (2) mounted coaxially in pipe (3) and pumping system (1) containing pumping device (2). Pumping device (2) includes axial or radial-axial pump containing guide tube (7) arranged around the impeller section of pumping device (2). In the installed position between the upper end (16) of guide tube (7) at outlet section (8) of pumping device (2) and casing pipe (3) there is a gap (11). Guide tube (7) has flexible section (12) at its outlet end. Flexible section (12) is made with the ability of bending in radial outside direction to casing pipe (3) to, at least partially, in a certain case completely close gap (11) during operation of pumping device (2).
EFFECT: inventions are aimed at higher efficiency of pumping device (2) operation by elimination of turbulence at outlet section (8).
14 cl, 6 dwg
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