FIELD: manufacture of pumps. SUBSTANCE: arranged in cylindrical housing which is provided with inlet and outlet branch pipes is rotor with hydraulic chamber for motion of liquid pistons. Drive of rotor and device for feeding the liquid to hydraulic chambers are made in form of hydraulic pump and rotor is made in form of shaft mounted for free rotation; rotor is provided with radial blades located on it over helical line. These blades form hydraulic chambers between surface of housing and shaft for motion of liquid pistons. Pitch of helical line of each blade reduces towards outlet branch pipe. Inlet branch pipe is provided with isolated suction gas passage and delivery liquid passage. Shell located in housing divides hydraulic chambers. Shaft is hollow and is mounted rotatably on fixed axle. Rotor is mounted in a spaced relation to inlet branch pipe; clearance is equal to 0.001 of inner diameter of housing. EFFECT: enhanced reliability. 4 cl, 4 dwg
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