Air sampling pump system

A pump is driven by a pump motor drive circuit that produces a series of pulse width modulated signals. A closed loop system is included to provide data indicative of any variation in the fluid flow. This is accomplished by using a Venturi located in the fluid flow path to create a pressure differen...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	ZIMMERMAN, PATRICK R, HAMPTON, GARY A
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CONTROLLING HEATING INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES LIGHTING MEASURING MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL MECHANICAL ENGINEERING METERING BY VOLUME PHYSICS POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS PUMPS FOR LIQUIDS OR ELASTIC FLUIDS REGULATING SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES TESTING WEAPONS
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Beschreibung
Zusammenfassung:	A pump is driven by a pump motor drive circuit that produces a series of pulse width modulated signals. A closed loop system is included to provide data indicative of any variation in the fluid flow. This is accomplished by using a Venturi located in the fluid flow path to create a pressure differential indicative of the fluid flow. A pressure transducer electronically measures this pressure differential which is then compared to a reference pressure differential indicative of the desired fluid flow. Any variation between the measured and desired fluid flow causes the pump motor drive circuit to vary the width of the pulses that are transmitted to the pump motor.