SUBMERGED PUMP UNIT TO PUMP OUT GAS-FLUID MIXES Russian patent published in 2009 - IPC F04D13/10 F04D31/00 

FIELD: engines and pumps.

SUBSTANCE: invention relates to machine building, particularly to submerged downhole pumps to pump out brine waters with associated gas. Pump unit comprises centrifugal pump 1 comprising at least two groups of 4 to 6 pump stages 7 successively fitted on shaft 8 of pump 1. each aforesaid group comprises impeller 16 with upper and lower plates and guide vanes 17 arranged between aforesaid plates. Inlet 11 of first group 4 communicates with pump inlet, and inlet 12 of every other group 5 communicates with outlet 13 of adjacent, previous, group 4. Every two adjacent groups 4-5 and 5-6 of stages 7 have vanes of impellers 16 with 1.4 to 1.7-times lower height h compared with that of the vanes of impellers 16 in adjacent group 4, 5 arranged upstream at outlet pressure at outlets 13, 15, 22 of every group 4-6 making at least 3 MPa in pumping water out.

EFFECT: higher reliability.

3 cl, 3 dwg