CENTRIFUGAL PUMP Russian patent published in 2019 - IPC F04D9/06 F04D15/00 

FIELD: engines and pumps.

SUBSTANCE: centrifugal pump comprises impeller (6) installed in housing (2), chamber (11, 10) for suction and delivery of pumped medium, jet ejector device with suction channel (12) for supplying medium from chamber (11) to wheel (6) and inlet working nozzle (13). Nozzle (13) is installed coaxially to channel (12) and is connected to chamber (10) by inlet. Pump has valve with seat (24) and spring-loaded membrane-controlled (21) shutoff-control element (22) for control of medium flow through nozzle (13). In housing (2) parallel to nozzle (13) is bypass channel (14). Ejector device is equipped with tube (3) arranged in chamber (10). Channel (12) is made inside tube (3). Valve is placed in the flow cavity (16) of the control body (22) additionally made in the housing (2) with the possibility of opening and closing the channel (14). Cavity (16) is formed on one side by a membrane (21) and connected by flow through holes (15) and (25) made in the housing (2) to the chamber (10) and the inlet nozzle (13), respectively. Valve seat (24) is made on edge of bypass channel (14) facing cavity (16) with possibility of interaction with element (22) at its movement together with membrane (21).

EFFECT: invention is aimed at reduction of dimensions and weight of pump due to optimum integration of valve and nozzle, wherein during pump operation change of head is insignificant, since slope of discharge-pressure characteristics of pump in the most used working range of flow rate values is reduced.

10 cl, 7 dwg