SUCKER ROD PUMPING UNIT Russian patent published in 2017 - IPC F04B47/02 

FIELD: oil and gas industry.

SUBSTANCE: pump unit contains string of the pump pipes and rods, lock support, cylinder with installed one above another stages with different diameters. On the string of the pump rods two hollow plungers of small and large diameters are suspended, they are connected coaxially and movably located inside the cylinder. The suction valve is installed in the large diameter plunger, its cavity is connected with the cylinder cavity by means of the holes. A weight is connected to the bottom end of the large diameter plunger and movable through the through passage. Tightening rubber rings are mounted at the lower end of the cylinder, which upper part is provided with toroidal weights, which are provided with rubber sealing rings. Above the toroidal weights on the external surface of the cylinder the spring-loaded clamps are installed in form of the isoscales triangle, its top looks upward. A weight section facing the large diameter cylinder inaxial direction is made in the form of a truncated cone with a hole in its center. A plate spring is positioned under the large diameter plunger.

EFFECT: full pump operability by increasing the pressing force of toroidal weights.

2 dwg