BOREHOLE PUMP UNIT Russian patent published in 2014 - IPC F04D13/10 F04D29/44 

FIELD: engines and pumps.

SUBSTANCE: invention relates to borehole pump units with multisection assemblies. Proposed plant comprises multistage rotary pump 1, inlet module 2, hydraulic protection unit 3, motor 4 with heat exchanger and current feed assembly 5 and borehole telemetry unit 6. It comprises two compensating couplings with upper and lower half-couplings with symmetric four-cam working surfaces and spring-loaded sets of balls. First compensating coupling is fitted in inlet module and can be centred therein by plain bearing composed by cermet sleeves to engage pump shaft with that of hydraulic protection unit. Chamber between upper and lower half-couplings in first compensating coupling is sealed and filled with grease. Second compensating coupling engages the hydraulic protection unit shaft with motor shaft. Said second coupling has threaded adapter on motor side for automatic adjustment of mutual axial displacement of half-couplings at starting the pump plant.

EFFECT: higher reliability, longer life.

2 cl, 8 dwg