| 摘要 |
<p>1,219,003. Fluid logic elements. SOC. BERTIN & CIE. 10 April, 1968 [21 April, 1967; 28 Feb., 1968], No. 17244/68. Heading G4P. A fluid logic element has a reflection chamber 10 with converging walls 17a, 17b, so that when a control channel 6 is actuated, a fluid jet from nozzle 8 is reflected from one of the walls to cause unequal pressures in the chamber whereby the stream is switched to that outlet channel on the same side of the chamber as the actuated control. The device is bi-stable when nozzle 8 is symmetrically disposed and the walls 17a, 17b equally inclined, and monostable when one of the outlets is preferred due to symmetry bias of the nozzle (Fig. 3, not shown) or to unequal inclination of the walls (Fig. 12, not shown). One of the control channels of the monostable device may be replaced by two channels (20), (21), Fig. 5 (not shown) to provide an AND/ NAND gate or, alternatively, by several channels each connected to a cylindrical fluid diode with a central orifice, closure of any one of which causes back pressure switching to the unpreferred outlet channel, thus providing an OR-NOR gate (Fig. 7, not shown). The channels (20), (21) may each have an injector (32) with a larger cross-section diffuser (33) to provide a valve to prevent back pressure from causing undesirable "flip-flopping" (Fig. 11, not shown). Negative feedback connections between outlet and control channels or the chamber 10 may be introduced to enhance stability (Figs. 13, 14, not shown) and isolating circuits, Fig. 15 (not shown), forming fluid diodes, may be connected to one or more of the control channels to prevent back pressure in the chamber 10 from interfering with the control channels (Figs. 16, 17, 18, not shown). The logic element is formed of three plates of plastics, metal, or the like, the rear sheet being solid, the middle sheet having the fluid channels, and the front sheet having apertures formed therein for connection to tubing. The fluid may be liquid or gas.</p> |
