WELL SUCKER-ROD PUMP PLANT Russian patent published in 1994 - IPC

FIELD: well pumps. SUBSTANCE: intake filter with cleaning facilities which is connected with working cylinder is provided with cylindrical perforated tail-piece. Interior of tail-piece is brought in communication with inlet of suction valve of cylinder. Scraper embraces tail-piece. Cleaning facilities are mounted for relative reciprocating motion during suction and discharge strokes and are provided with individual reciprocating motion drive in form of cylinder-piston pair. Piston is connected with scraper by means of rod and disk. Interior of additional cylinder is brought in communication with interior of working cylinder. Additional scraper is made in form of spring having rectangular coils which is mounted in tail-piece for engagement with disk of individual drive. EFFECT: enhanced reliability. 1 dwg