PNEUMATIC PUMP Russian patent published in 1999 - IPC

FIELD: manufacture of pumps; handling high- viscosity badly contaminated liquids and water-and-oil pulse. SUBSTANCE: units 41 and 42 used for connecting common rod 4 with any of two working pistons 28 and 29 of pump are made with radial clearances; units for discharge of pulp from working cylinders 24 and 25 are made in form of two interconnected passages 46, 48 and 45, 47 located in upper and lower parts of covers 43 and 44. Chamber 23 separates hydraulic distributor 16 from control pneumatic cylinder 19 and pneumatic distributor 9 is located in pump housing between drive chambers 5 and 6; limit switches 2 and 3 are components of pneumatic distributor 9; pneumatic lines 7 (8) running to drive chamber 5 (6) of pump and pneumatic line 36 (37) running to pneumatic cylinder 19 of hydraulic distributor 16 are made separate at each stroke of piston; they are brought out of independent chambers of pneumatic distributor. EFFECT: enhanced operational efficiency and reliability of pump. 3 cl, 2 dwg