Abstract:
Pneumatic logic system.The logic chain is established by juxtaposition of logic modules each of them being provided with a selecting organ having at least two positions allowing to modify the circuit diagram.Advantageous system for the sequential control of machines by pneumatic way.
Abstract:
Fluid logic type system elements have structure and fluid flow paths which modify the shape of input fluid pressure signal waveforms to produce output waveforms of desired characteristics. Basic logic elements are of the taut flexible diaphragm type that control fluid flow paths through two opposed chambers by differential fluid pressures in the chambers on either side of the diaphragms. The chamber structure intercepting the diaphragm is constructed with critical profile shape to afford different characteristic responses to input fluid signals to the chambers. With such elements fluid signals may be introduced in various flow paths to achieve various output waveform shapes in response to generally on-off type digital input signals, including shortening, lengthening, inverting, delaying, and sharpening. Such functions as integration, differentiation, threshold detection and oscillation are attained. By use of passive resistive and capacitive fluid flow elements, delays and wave shaping features are simply introduced to improve the waveshaping versatility of the logic elements. Thus, simple logic elements or combinations thereof are employed together with construction of fluid flow path characteristics and selection of flow routes in a network to produce various modifications on signal pressure waveform shapes. Particular advantage is realized by using the dynamic negative going transitions of waveforms thereby providing fast switching signals, amplification and waveform shape controls.
Abstract:
A digital hydraulic system converts binary digital input information into displacement of a digital drive. An air reader is used to operate binary latch valves through an air hydraulic interface. A flow sensing system and a hydraulic logic unit cooperate to provide high speed exchange between the piston adders of the digital drive prior to displacement of the load. A hydraulic cylinder sweeps the load about a vertical axis. A selfcooling, air-driven hydraulic pump with an accumulator, provides relatively constant pressure. A damper secured to the piston adders has an additional drive for providing precise location at the end of damping. An incremental paper tape feed with a four motion rack with toggle action indexes the air reader.
Abstract:
According to one aspect of the present invention a flow distributor comprises a series of fluid switch devices each adapted to receive a respective input flow, coupling paths connecting the devices into a chain, and two common output regions to one or other of which the input flows are routed through the device according to the conditions of the device, the coupling paths being arranged to divert from each device to the next in the chain, a diversionary flow which tends to propagate from the one device to the next the condition prevailing in the former.
Abstract:
The present disclosure relates to a device for analyzing a fluid sample. In one aspect, the device includes a fluidic substrate that comprises a micro-fluidic component embedded in the fluidic substrate configured to propagate a fluid sample via capillary force through the device and a means for providing a fluid sample connected to the micro-fluidic component. The device also includes a lid attached to the fluidic substrate at least partly covering the fluidic substrate and at least partly closing the micro-fluidic component. The fluidic substrate may be a silicon fluidic substrate and the lid may be a CMOS chip. In another aspect, embodiments of the present disclosure relate to a method for fabricating such a device, and the method may include providing a fluidic substrate, providing a lid, and attaching, through a CMOS compatible bonding process, the fluidic substrate to the lid to close the fluidic substrate at least partly.
Abstract:
A device for diverting fluid from the ventricles of the brain to another area of the body includes an inlet, an outlet, and a resistance member operatively connected to the inlet and the outlet. The resistance member includes a first plate, a surface of which has a groove which defines a resistance flow channel, an entry of the flow channel being in fluid communication with the inlet and an exit of the flow channel being in fluid communication with the outlet; and a second plate, the second plate being held in abutment with the grooved surface of the first plate so as to define a resistance tube. The resistance tube includes a plurality of arcs arranged in flow series, each arc radially extending between the inner and outer diameters of the first and second plates. A selection mechanism operable to interconnect a selected number of the arcs to the inlet and outlet is provided.
Abstract:
The invention describes devices for controlling fluid flow, such as valves. The devices may include one or more electroactive polymer transducers with an electroactive polymer that deflects in response to an application of an electric field. The electroactive polymer may be in contact with a fluid where the deflection of the electroactive polymer may be used to change a characteristic of the fluid. Some of the characteristic of the fluid that may be changed include but are not limited to 1) a flow rate, 2) a flow direction, 3) a flow vorticity, 4) a flow momentum, 5) a flow mixing rate, 6) a flow turbulence rate, 7) a flow energy, 8) a flow thermodynamic property. The electroactive polymer may be a portion of a surface of a structure that is immersed in an external fluid flow, such as the surface of an airplane wing or the electroactive polymer may be a portion of a surface of a structure used in an internal flow, such as a bounding surface of a fluid conduit.
Abstract:
A fluid deflecting assembly for deflecting a fluid medium in any desired direction, particularly suited for use in an air conditioner, which has a nozzle for issuing a main stream of fluid as the fluid passes therethrough, a guide wall at a position downstream of the nozzle and having substantially a diverging shape in a direction downstream with respect to the direction of flow of the main stream and opening outwardly in a direction away from the nozzle, and a control device for controlling the mode of flow of the fluid at a position upstream of the nozzle. The nozzle has a relatively small thickness in the direction of flow of the fluid therethrough and is so shaped as to constrict the flow of the fluid as the latter passes therethrough.
Abstract:
A membrane channel-valve is disclosed, having a switching membrane responsive to the pressure in a switching chamber therein to open or close a conduit to control gas flow between pressure medium intake and outflow connections. The channel-valve is controlled by a conversion valve forming a seal between a control medium intake line and a control medium output line so that when closed there is a static pressure in the intake line and when open there is a gas current flow through the intake line. A jet pump is provided having an exit opening in the control medium intake line and an entrance opening in the switching chamber of the channel-valve, to pressurize the switching chamber during static pressure conditions to close the channel-valve and to provide a low pressure therein during current flow conditions to open the channel-valve.
Abstract:
The present invention provides a microfluidic system comprising at least one microchannel (18) having an inner wall (17). The microfluidic system comprises attached to the inner wall (17) of the at least one microchannel (18) a plurality of ciliary N actuator elements (10a-d) and at least one floating current wire (14a-d) present in the at least one microchannel (18) for applying a magnetic field to the plurality of ciliary actuator elements (10a-d) for changing their shape and/or orientation. The present invention also provides a method for the manufacturing of such microfluidic systems and to a method for controlling a fluid flow through a microchannel (18) of such a microfluidic system.