| 摘要 |
FIELD: oil and gas production. ^ SUBSTANCE: invention is related to procedure of oil production, in particular, to oil well pumps. Oil well pump comprises cylinder with suction valve installed in cylinder with the possibility of reciprocal motion and plunger with delivery valve. Wavy closed grooves are applied onto surface plunger perpendicular to its axis, as well as scars that are evenly distributed along plunger length with pitch of at least one and a half diametre of plunger. Scars have height that does not exceed value of gap to the side of pump provided by fit class. ^ EFFECT: increased resource of pump operation independently on used materials, improved wear resistance of pair of cylinder-plunger due to lubrication of coupled surfaces, and also reduction of leaks through gap between cylinder and plunger due to turbulisation of border layer at plunger wall. ^ 3 dwg |
