PUMP FOR HANDLING LIQUID MEDIUM Russian patent published in 2007 - IPC F04B9/10 

FIELD: oil producing industry; positive displacement hydraulic machinery.

SUBSTANCE: invention relates to piston machines and it can be used for handling viscous and nonhomogeneous liquids, mainly, for maintaining formation pressure at producing of oil. Proposed pump for liquid medium contains tandem cylinder with rod and pistons dividing it into four spaces. First and second spaces, being rod ones, are connected through hydraulic distributor with pump and drain of working component. Spaces for liquid medium are connected with inlet and delivery lines of liquid medium provided with check valves. Pump has two additional reservoirs, each being divided by piston into two spaces, first of which are spaces for liquid medium and second spaces of first and second additional reservoirs are connected, second space of first and second additional reservoirs through hydraulic distributor with pump and drain of working component parallel to first and second rod spaces of tandem cylinder, respectively. Each pipeline of leakage compensation system is furnished with two check valves pointed in opposite directions, one of which is installed in wall of second space of additional reservoir with possibility of opening at interaction with piston of corresponding additional reservoir.

EFFECT: reduced requirements to pump delivering working component, improved conditions of operation of tandem cylinder pistons.

3 cl, 1 dwg