LIFTING DEVICE HYDRAULIC DRIVE Russian patent published in 1999 - IPC

FIELD: mechanical engineering; drive of pumps designed for lifting water from depth. SUBSTANCE: drive has working cylinder 1 and balancing tandem cylinder 5 with rod 6 and pistons 7 and 8 on its ends installed to form four spaces 10, 11, 12, 13. Rod space 11 forms closed hydraulic circuit with rod space 4 of working cylinder 1. System for compensating liquid leaks from this circuit has plunger pump with plunger 21 and two check valves 20 and 22 and is arranged in space 19 of rod 6 of tandem cylinder 5. Plunger 21 of pump has rod 23 installed for interaction with stop (cover 24). Liquid leaks compensation system operates only when necessity arises to fed liquid into closed hydraulic circuit. EFFECT: enhanced adaptivity to manufacture and performance characteristics of drive. 2 cl, 2 dwg