Micro mass flow control appts. and method

A micro-mass flow controller (10) has a sonic choked flow restriction (28) with an oscillatable valve (26) for repetitiously opening and closing the sonic choked flow restriction (28) in a time-modulated sequence to set or vary mass flow rate of gas through the sonic choked flow restriction (28) ove...

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Bibliographische Detailangaben
Hauptverfasser:	CHARLES E. MILLER, JERRY C. WYSS, RICHARD B, JR. BALSLEY
Format:	Patent
Sprache:	eng
Schlagworte:	ACTUATING-FLOATS BLASTING COCKS CONTROLLING DEVICES FOR VENTING OR AERATING ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MECHANICAL ENGINEERING PHYSICS REGULATING SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES TAPS THERMAL INSULATION IN GENERAL VALVES WEAPONS
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Beschreibung
Zusammenfassung:	A micro-mass flow controller (10) has a sonic choked flow restriction (28) with an oscillatable valve (26) for repetitiously opening and closing the sonic choked flow restriction (28) in a time-modulated sequence to set or vary mass flow rate of gas through the sonic choked flow restriction (28) over a period of time to something between no flow and maximum mass flow rate. A bimorph piezoelectric actuator (40) is coated in a sputtered dielectric layer (78) and then encapsulated in stainless steel or other metal cladding (80). A closure member (46) on the actuator (40) is registered to a valve seat (70) by actuating the actuator (40) to force the closure member (46) in a puddle of adhesive (86) against the valve seat (70) until the adhesive (86) cures.