Energy efficiency of the linear rack drive for sucker rod pumping units

The analysis of ways to improve the energy efficiency of sucker rod pumps by mechanical means has been carried out. It is shown that the most effective mechanical way to increase the efficiency is the usage of a linear rack drive of the developed design, which makes it possible to increase the efficiency of the installation by 10% compared to analogues. Kinematic and strength calculations of a linear rack and pinion drive with a stroke length of 1120 mm and a load of up to 8 tons were carried out. The linear speed of the drive, the number of double strokes per minute were determined, the diameter, gear ratio and other gear-rack transmission parameters were selected, and the choice of a gear motor was made. For this drive size for rod loads of 60000 - 80000 N, SEWEURODRIVE KAZ-97 geared motor was selected with n1 = 1480 min-1, P1 = 22 kW, i = 19, n2 = 78 min-1, service factor – 1,35, Mn2 = 3210 N/m. The usage of a geared motor with a power of 22 kW is limited by the speed of the rail within 0,25 ... 0,3 m/min and the allowable load is 73300 N.  According to the results of calculating the gear shaft teeth for bending strength, the selected module made of 40X steel with surface hardening withstands loads up to 80000 N