Resonant system to pump liquids, measure volume, and detect bubb

Details Resonant system to pump liquids, measure volume, and detect bubb Resonant system to pump liquids, measure volume, and detect bubb

1994-06-10

1998-06-23

Thorpe, Timothy

Pumps

Processes

417416, 4174131, 417360, F04B 1703

Patent

active

057696080

ABSTRACT:
An electromechanical transducer drives a resonator plate, which develops oscillating pressure in a contacting liquid. A high-speed check valve rectifies the pressure oscillations, causing pumping. On the driver side of the valve, the high inertial flow impedance in a narrow passageway confines oscillating pressure while admitting non-oscillating fluid flow. On the valve side opposite the driver, a volumetric compliance element decouples the inertia of the fluid passageway to permit fast acceleration and deceleration of fluid pulsing through the valve. A high-speed passive check valve consists of a thin-section o-ring covering a circular slot, with circumferential tension setting the forward bias pressure. Pump frequencies above one kilohertz and microliter stroke volumes are practical. Electrical impedance measurements on the pump indicate fluid volume in the pump. A coupling of two pumps in series and an alternation of pumping and volume measurement operations in the coupled pumps leads to volumetric metering of fluid.

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Technical Manual Entitled "Uttrasonic Motor" By The Electric Motor Division of Matsushita, Author Unknown, Date Unknown.

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