BEAMLESS PUMPING UNIT Russian patent published in 2014 - IPC F04B47/02 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed unit comprises prop 1 to support reduction gear motor 2, guide screws 3 and 4 aligned with bar and well axis and provided with nuts 5, 6 rigidly secured to crossbar 7 secured at the bar. Prop top part 1 accommodates revolving equalizing roller 9 with elastic link 8, its one end being connected with crossbar 7 and opposite end with equalizing counterweight 10. Guide screws 3, 4 are provided with diametrically opposite helical dents 11, 12. Top ends of the latter, like bottom ends, are interconnected by smooth transition to make an endless belt groove. Nuts 5, 6 have through horizontal holes 14, 15 to receive cylindrical cartridges 16, 17 to be fitted from diametrically opposite sides to revolve therein and provided with rectangular groove facing said guide screws 3, 4. Rollers 18, 19 are fitted in grooves of cylindrical cartridges 16, 17 to run on pins 20, 21. Rollers part extending outward feature cross-section mating with that of belt grooves 12, 13 to roll thereat to ensure reciprocation of nuts relative to guide screws.

EFFECT: higher reliability, easy and friendly servicing.

2 dwg