SUBMERSIBLE HYDRAULIC PUMPING UNIT Russian patent published in 2007 - IPC F04B47/06 

FIELD: oil producing industry.

SUBSTANCE: invention is designed for pumping liquids out of wells. Proposed submersible pumping unit includes submersible electric motor with hydraulic protection, power pump, filter with casing, compensator with casing, hydraulic motor with cylinder and piston, operating cylinder with valves and plunger connected by rod with piston of hydraulic motor, spool-type distributor and head. Power pump, casings of filter and compensator, cylinder of hydraulic motor and operating cylinder are connected in sequence by adapters provided with flange and threaded nipples. Nipples are eccentric relative to flange and are turned into thread cut in casings of filter and compensator, in cylinder of hydraulic motor and in operating cylinder. Head is also provided with flange and nipple eccentric relative to flange turned into thread of operating cylinder. Operating cylinder is double-acting, with suction and delivery valves in rod and rodless chamber. Suction and delivery valves of rod chamber of operating cylinder are arranged in peripheral part of adapter flange between hydraulic motor and operating cylinder. Suction valve of rodless chamber of operating is arranged in peripheral part of head flange, and delivery valve of rodless chamber of operating cylinder is arranged along axis of head flange. Spool-type distributor is located in said adapter between hydraulic motor and operating cylinder, with ends of spool getting into rod chambers of hydraulic motor and operating cylinder. Said adapter accommodates also elastic seals of rod connecting piston of hydraulic motor with plunger of operating cylinder. Distributor and power pump and rodless chamber of hydraulic motor and valves of rod chamber of operating cylinder with head are hydraulically coupled by means of connecting tubes with threaded unions turned into peripheral parts of flanges of corresponding adapters and head.

EFFECT: simplified design, improved reliability of device.

13 cl, 4 dwg