PRECISION ANALYTICAL PUMP

摘要

Programmable precision analytical pump with continuous flow and no pulsing for moving liquids and solutions with no dead recharging time for use in instrumental chemical analyses (titrators, continuous-flow analyzers, low-pressure liquid chromatographs, mass spectrometers) on pharmaceutical and fine-chemical product process lines, and in clinics and hospitals for the controlled infusion of medication. It comprises a micro-step electric motor (1) that actuates a linear-movement tubular shaft (2) coupled to two symmetrically opposed pistons (3) that penetrate two volumetric chambers (4) of variable volume that are symmetrically opposed and coaxial to said shaft, with ante-chambers (5) arranged between said chambers and the motor, surrounding the movement area of said pistons. Said chambers have connections for flow direction control valves (6). O-rings (7) are used to fit the internal wall of the chambers to the pistons. Said shaft, which is hollow along the length of same, enables communication between the ante-chambers. A digital electronic circuit monitors operation of the pump, limits the movement of the pistons, using sensors (8), and communicates with the operator by means of a keyboard and liquid crystal display, and with a computer by means of a serial port.