Experimental Research on Parameters of a Late-Model Hydraulic-Electromotor Hybrid Pumping Unit

Figure 1

The structure of the hydraulic-electromotor hybrid beam pumping unit. 1. Sucker pump; 2. Oil pipe; 3. Sucker rod; 4. Suspension point; 5. Horsehead; 6. Beam; 7. Link rod; 8. Balance weight; 9. Crank; 10. Reducer (1); 11. Pulley; 12. Belt; 13. Torque coupling gearbox (1); 14. Reduce (2); 15. Torque coupling gearbox (2); 16.Variable-displacement pump; 17.Accumulator; 18. Relief valve; 19. Variable-displacement motor; 20. Electromotor.