PUMPING UNIT Russian patent published in 2000 - IPC

FIELD: oil producing industry; pumping fluid out of wells. SUBSTANCE: pumping unit includes housing with rod connected with movable member of drive pump, mechanism for reciprocating motion of rod and distributor connected with delivery and drain lines which are connected with working pump. Housing is divided into two parts by means of flange with hole through which rod is passed; bellows connected with rod are mounted in housing on both sides of flange. Housing of pumping unit cover forming cavity together with inner surface and flange. Reciprocating motion mechanism is made in form of piston mounted in cavity and secured to rod; this piston divides cavity into two parts which may be connected with delivery and drain lines through distributor. Parts of housing divided by flange are interconnected; bellows are interconnected and are connected with drain line. EFFECT: enhanced reliability; increased service life. 1 dwg