| 摘要 |
FIELD: mechanical engineering; oil producing industry. ^ SUBSTANCE: invention can be used in pumping units designed for transfer of viscous liquids. Method of control is implemented by device with translationally moving pairs of pistons of drive cylinders rigidly coupled with corresponding working members of delivery cylinders. Piston spaces are alternately coupled with delivery main line of main pressure source and with drain main line. Pistons are returned into initial position owing to constant hydraulic coupling of rood spaces. Accelerated return of piston into initial position is provided by hydraulic coupling of rod spaces with delivery main line of additional pressure source, and when piston reaches initial position, additional pressure source is connected with piston space of hydraulic cylinder whose piston is in initial position, and preliminary loading is provided till piston reaches final position executing working stroke. Then piston space of preliminarily loaded piston is disconnected from delivery main line of additional pressure source and is connected to delivery line of main pressure source. ^ EFFECT: reduced nonuniformity of pressure in pump main line owing to successive operation of translationally moving pistons. ^ 12 cl, 4 dwg |
