PUMP FOR PUMPING LIQUID, AS WELL AS IMPELLER ASSEMBLY Russian patent published in 2020 - IPC F04D7/04 F04D29/20 F04D29/42 F04D13/08 

FIELD: engines and pumps.

SUBSTANCE: group of inventions relates to pumps for pumping contaminated liquid, in particular sewage with solid inclusions. Pump comprises impeller (4) and drive shaft assembly extending in axial direction. Far end of drive shaft assembly is located in central recess of impeller (4). Drive shaft assembly comprises drive shaft (14) and connecting pipe. Connection pipe comprises sleeve (16), which is in telescopic interaction with shaft (14). Impeller (4) during operation of pump (1) moves in axial direction relative to said sleeve (16) between initial far and near positions. Impeller (4) is offset in the direction of the initial far position by means of a spring element located between bushing (16) and impeller (4). Connection pipe comprises hollow adjusting screw that is in threaded engagement with inner side of sleeve (16) and is configured to limit the maximum degree of telescopic overlap between sleeve (16) and shaft (14). Impeller screw passes through adjusting screw and enters threaded engagement with shaft (14) to press adjusting screw (31) to shaft (14).

EFFECT: invention is aimed at increasing service life.

8 cl, 5 dwg