Precision, constant-flow reciprocating pump

A pump with an interchangeable fluidic module comprising:

• two pistons, each piston having an axis of displacement;
• the two pistons are actuated by two pumping carriages and placed in two opposing pumping chambers;
• the two opposing pumping chambers are situated respectively in two cylinder blocks which are held together parallel to the axes of displacement of the pistons;
• one of the two cylinder blocks has an inlet port through which fluid is sucked into the pumping chambers during a filling movement of the pistons, then the fluid is expelled from the pumping chambers during an emptying movement of the pistons towards an outlet port in the other of the two cylinder blocks;
• a switching element comprising an inlet connection port, inlet transfer chambers, an outlet connection port, and outlet transfer chambers;
• the inlet transfer chambers are connected to the inlet by the inlet connection port and the outlet transfer chambers are connected to the outlet by the outlet connection port,
• the pump comprising a rotor and a motor, wherein the rotor is rotated by the motor;
• the movement of the pistons being characterized by a cam groove, the cam grove being placed in the rotor with a rotation axis of the rotor being positioned perpendicular to the axes of displacement of each of the pistons;
• wherein the rotor simultaneously actuates movement of the two pumping carriages and the switching element in an independent manner;
• and
• wherein the two pumping chambers expel simultaneously to the outlet port over a segment of the cam groove in the rotor.