STAGE OF DOWNHOLE MULTISTAGE ROTARY PUMP Russian patent published in 2013 - IPC F04D13/10 F04D29/41 

FIELD: engines and pumps.

SUBSTANCE: pump stage consists of impeller fitted on the shaft to displace axially thereon and fixed distributor. Thrust collar is arranged on face surface of said impeller in contact area to get in contact with axial bearing 5 arranged on the face of guide vanes to make thrust bearing. Axial bearing 5 is composed of washer made from elastomer and has radial grooves made on its end surface and spaced through equal angles on ID and OD sides. At least, one of side walls 10 of radial grooves is inclined at acute angle to face surface of axial bearing 5 to make ledge 11 above groove bottom to bend axially in rotation.

EFFECT: decreased leaks through bearing, higher efficiency.

3 cl, 3 dwg