| 摘要 |
FIELD: engines and pumps. ^ SUBSTANCE: unit is intended for application in equipment for oil production. Unit comprises cylinder and plunger with hollow stem, valves and connection elements with lock support and traction device. Installation is arranged with additional plunger and cylinder with pressure valve installed at the other end of stem. Cylinders alternately operate for suction and injection of formation liquid. Stem in part of working cycle of unit is separated from traction device, i.e. it is floating. ^ EFFECT: increased manufacturability and maintainability of design. ^ 2 cl, 2 dwg |
