POSITIVE DISPLACEMENT MULTISTAGE PISTON MACHINE Russian patent published in 2002 - IPC

FIELD: mechanical engineering; hydraulic systems. SUBSTANCE: proposed machine has high- pressure cylinder installed in low-pressure cylinder space to form radial and end face clearance in high-pressure space. Plunger is connected with enclosing additional cylinder with piston which is installed in radial clearance between high-pressure and low-pressure cylinders with ring clearance between inner surface of additional cylinder and outer surface of additional cylinder piston with inner surface of low-pressure cylinder. Plunger and additional cylinder can be connected by resilient member. Diameter of plunger after seal at low pressure side can be less than that at high pressure side. EFFECT: increased efficiency owing to decrease of axial dimensions. 3 cl, 2 dwg