Abstract
This paper concerns with a new moving part fluid-logic device based on a pneumatic amplifier with a positive feedback system.
A nozzle is built in an enclosed chamber and counter-faces the movable closed end of a set of bellows placed in the chamber. Air is fed from a constant pressure source into the enclosed chamber through the nozzle and flows out to the atmosphere through a vent orifice provided on the chamber wall. The orifice, the nozzle and the closed end form a pneumatic amplifier circuit with positive feedback caused by the bellows action and the circuit is so arranged to have bi-stable transfer characteristics. Pulsating pressure is introduced in the bellows and the pressure in the enclosed chamber maintains either a high pressure level nearly equal to the supply pressure or a low pressure level equal to the atmospheric pressure. By adjusting the gap between the nozzle and the closed end of the bellows initially, the device can be employed as an inverter with Schmitt-trigger and a bi-stable flip-flop.
