OIL-WELL SUCKER-ROD PUMP Russian patent published in 1999 - IPC

FIELD: oil industry. SUBSTANCE: pump is designed for handling liquids with high content of abrasive admixtures. Pump has cylinder, hollow plunger made of elastoplastic material and rod-valve installed for axial displacement. Shifter bushing is installed on upper end of rod-valve. Lower part of bushing and upper part of plunger are arranged at angle relative to axis of symmetry. lower part of plunger and lower part of rod-valve are arranged at angle relative to axis of symmetry, forming taper part. End face parts of plunger are provided with nozzle. Lower part of rod-valve is also provided with nozzles. EFFECT: increased capacity and service life of pump owing to reduced wear of plunger-cylinder pair especially at high content of abrasive admixtures in handled liquid. 3 cl, 3 dwg