Precision analytical pump

Abstract

Precision Analytical Pump of continuous flow, programmable and without pulsation, moves liquids and solutions without dead recharge time, for application in instrumental chemical analysis, in pharmaceutical and Fine Chemistry process lines. It consists of a micro-step electric motor ( 1 ), who drives a shaft with linear displacement ( 2 ), coupled to two pistons ( 3 ), which penetrate two volumetric chambers of variable volume ( 4 ), with antechambers ( 5 ) arranged between said chambers and motor, involving the movement path of pistons. Said chambers have connections with valves ( 6 ) for directional flow control and inner walls fit pistons with sealing rings ( 7 ). Said antechambers communicate in order inner saturated air can go from one to the other, for pressure equilibrium during pistons displacement. A digital electronic circuit monitors pump operation, limiting pistons course by sensors ( 8 ), and allows interface with the operator and with a computer.

1 ) “ANALITICAL PRECISION PUMP”, instrument for propulsion of liquids, particularly applicable to analytical instrumentation, chemical and pharmaceutical industrial process control and outpatient infusion, characterized by the fact of presenting two symmetrical and coaxial opposing pistons ( 3 ), driven by common axis with alternating linear movement ( 2 ). 
     
     
         2 ) “ANALITICAL PRECISION PUMP”, instrument for propulsion of liquids, particularly applicable to analytical instrumentation, chemical and pharmaceutical industrial process control and outpatient infusion, characterized by the fact of presenting, in conformity with  claim 1 , two volumetric chambers of variable volume ( 4 ), opposed, symmetrical and coaxial. 
     
     
         3 ) “ANALITICAL PRECISION PUMP”, instrument for propulsion of liquids, particularly applicable to analytical instrumentation, chemical and pharmaceutical industrial process control and outpatient infusion, characterized by the fact of presenting, in conformity with  claim 1 , tubular antechambers ( 5 ), adjacent to said chambers. 
     
     
         4 ) “ANALITICAL PRECISION PUMP”, instrument for propulsion of liquids, particularly applicable to analytical instrumentation, chemical and pharmaceutical industrial process control and outpatient infusion, characterized by the fact of presenting, in conformity with  claim 1 , a linear actuator constituted by electric microstepping motor ( 1 ) which moves the said axis. 
     
     
         5 ) “ANALITICAL PRECISION PUMP”, instrument for propulsion of liquids, particularly applicable to analytical instrumentation, chemical and pharmaceutical industrial process control and outpatient infusion, characterized by the fact of presenting, in conformity with  claim 1 , directional valves ( 6 ) to control liquid input and output of said chambers. 
     
     
         6 ) “ANALITICAL PRECISION PUMP”, instrument for propulsion of liquids, particularly applicable to analytical instrumentation, chemical and pharmaceutical industrial process control and outpatient infusion, characterized by the fact of presenting, in conformity with  claims 1  and  2 , communication between said antechambers. 
     
     
         7 ) “ANALITICAL PRECISION PUMP”, instrument for propulsion of liquids, particularly applicable to analytical instrumentation, chemical and pharmaceutical industrial process control and outpatient infusion, characterized by the fact of presenting, in conformity with  claims 1  and  6 , communication through the channel passing inside the said axis. 
     
     
         8 ) “ANALITICAL PRECISION PUMP”, instrument for propulsion of liquids, particularly applicable to analytical instrumentation, chemical and pharmaceutical industrial process control and outpatient infusion, characterized by the fact of presenting, in conformity with  claims 1  and  6 , communication by external duct to said antechambers.