FIELD: engines and pumps.
SUBSTANCE: group of inventions relates to submersible centrifugal pumps. A submersible centrifugal pump includes housing (140) having an inlet located as a whole opposite the pump outlet. Shaft (150) driven with a submersible motor passes at least partially in housing (140) of the pump. To shaft (150) there attached is centrifugal impeller (155) having a fluid medium inlet hole. Diffuser (160) forming a pump stage together with this centrifugal impeller (155) is located according to the above centrifugal impeller (155). Screw (165) is connected to shaft (150) and arranged inside compressor pipe (170) that is located in housing (140) of pump (120).
EFFECT: group of inventions is aimed at improvement of pumping efficiency of a medium with solid particles and gas by reducing a risk of the pump blockage with solid particles at low flow velocities of the pumped medium and by reduction of formation of gas plugs.
18 cl, 5 dwg
