AXIALLY DIAGONAL SCREW PUMP WITH ROTOR AUTOMATIC RADIAL LOAD RELEASE UNIT Russian patent published in 2013 - IPC F04D3/02 F04D29/41 

FIELD: engines and pumps.

SUBSTANCE: pump comprises housing with inlet and outlet and rotor. The latter comprises the shaft running in radial and radial thrust ball bearings and auger wheel with helical blades and hollow taper bush fitted on said shaft. Said bush adjoins the outlet at larger diameter via radial and end grooves of slotted stepwise clearance to make release chamber with bypass channels on outer side of wheel space. Said channels communicate the chamber with auger wheel inlet cavity. Radial thrust ball bearing outer race is fitted in the housing with end clearance not smaller than end clearance of said slotted stepwise seal. Shroud is fixed at the auger wheel blades, at wheel outer line taper section, to abut on inlet via slotted seal end clearance equal thereto.

EFFECT: higher reliability, longer life.

1 dwg