SIGNAL-ACTIVE POSITIVE-DISPLACEMENT MUD PUMP Russian patent published in 2008 - IPC F04B15/02 

FIELD: oil and gas producing industry.

SUBSTANCE: invention is designed to deliver mud into bottom hole at drilling of wells. Proposed pump includes hydraulic part with cylindrical bushing and piston placed inside. Piston is secured on rod with elastic baffle of handle liquid, and it reciprocates in cylinder. System to deliver lubricating-and-cooling liquid to friction surfaces of cylinder bushing and piston includes union installed on rod with flexible hose to deliver sealing-and-lubricating liquid along channel lengthwise rod axis connected by radial hole with union. Union to deliver cooling-and-lubricating liquid is fitted in baffle made in form of self-sealing cup enclosing radial hole.

EFFECT: simplified design, reduced length and mass of pump and time taken for servicing.

2 dwg