Ultra-long stroke multi-cylinder reciprocating pump

An ultra-long stroke multi-cylinder reciprocating pump, comprising:

• a small gear, a large gear, a crankshaft, connecting rods, fixed racks, a frame, translation pinions, movable racks, clamps, piston rods, cylinder sleeves, pistons, suction valves, liquid discharging valves, guide rails, a prime motor, a coupling, and a small gear shaft;
• wherein the small gear is fixedly mounted on the small gear shaft, the large gear is fixedly mounted on the crankshaft, one end of the connecting rod is connected with the crankshaft, the other end of the connecting rod is connected with a rotation center of the translation pinion, the fixed rack, the guide rail and the cylinder sleeve are all fixed on the frame, the movable rack is mounted in the guide rail and movable along the guide rail, one end, close to the cylinder sleeve, of the movable rack is connected with the piston rod through the clamp, the piston rod is fixedly connected with the piston, the prime motor is fixed on the frame, and an output shaft of the prime motor is connected with the small gear shaft through the coupling;
• wherein when the prime motor rotates, the small gear shaft and the small gear are driven to rotate, the small gear is meshed with the large gear, rotation power of the small gear shaft is decelerated and then transmitted to the large gear, the crankshaft is driven to rotate, the rotation center of the translation pinion is driven to move reciprocally through the connecting rod, and the translation pinion drives the movable rack and the piston to move reciprocally;
• wherein when the piston moves towards the opening side of the cylinder sleeve, the liquid discharging valve is closed, the suction valve is opened, and liquid enters the cylinder sleeve;
• wherein when the piston moves towards the closing side of the cylinder sleeve, the suction valve is closed, the liquid discharging valve is opened, and the liquid is pressurized and then discharged out of the cylinder sleeve;
• wherein a distance of reciprocating motion of the rotation center of the translation pinion is directly proportional to a radius of the crankshaft, and in a centering type arrangement, the distance is twice the radius of the crankshaft;
• wherein when the rotation center of the translation pinion moves, gear teeth on the upper part of the translation pinion is meshed with the fixed rack to form a speed instantaneous center, and an instantaneous speed when a lower portion of the translation pinion is meshed with the movable rack is twice that of the rotation center of the translation pinion, so that a distance of reciprocating motion of the movable rack is twice the distance of reciprocating motion of the rotation center of the translation pinion;
• therefore, a stroke of the piston is four times the radius of the crankshaft, so that a stroke of the reciprocating pump reaches an ultra-long stroke that is twice the stroke of a reciprocating pump of a conventional crank connecting rod mechanism with the same radius of crankshaft.