SUBMERGED LABYRINTH-SCREW PUMP Russian patent published in 2011 - IPC F04D13/08 F04D3/02 F04D29/70 

FIELD: engines and pumps.

SUBSTANCE: pump includes rotor 3 on outer surface of which there are grooves 6, and housing 1 on inner axial surface of which there are grooves 2. On end surfaces of housing 1 there is inlet and outlet channel 12, 13. Blades 7 are provided on end surface of rotor 3 on the side of inlet channel 12. Pump inlet is connected to peripheral cavity 11 of blades 7, which is connected to inner cavity 16 of bowl-shaped sump by means of discharge holes 10 for impurities in housing 1 of pump. Bottom 8 of sump has tight connection 20 to inlet part of housing 1 of pump between discharge hole 10 for impurities and hole 9 located in housing 1 of pump as close to rotor 3 rotation axis as possible. Such pump design allows supporting constant pressure at the inlet, which guarantees cavitation-free mode, and allows avoiding repair work on replacement or cleaning of filter element. Absence of solid impurities in working fluid improves reliability and service life of pump operation.

EFFECT: higher reliability, longer cavitation-free operating mode and convenient operation of the pump.

1 dwg