A diaphragm pump having a body including a suction connection and a discharge connection, a suction valve and a discharge valve; a control chamber in which the diaphragm is disposed, and a working chamber located on the side of the diaphragm opposite the control chamber; a control pipe suitable for linking the control chamber to a control connection of the body, the control pipe configured to alternately apply a vacuum and a pressure on the diaphragm; the body includes a housing oriented transversely relative to the control pipe, the housing being open towards the outside at one end, and closed at the other end by a bottom including a suction opening and a discharge opening, the diaphragm being positioned close to the bottom, and held by a cap engaged in the housing, the cap having a recess forming the control chamber, linked to a passage communicating with the control pipe.

A channel-less microfluidic pump includes a cartridge including a substrate and an actuatable film layer disposed on the substrate, and a manifold having at least three actuatable void volumes separated by a plurality of wall sections and an actuatable flexible layer disposed on the manifold interfacing the actuatable film layer. In operation, the pump can be in an unactuated state wherein the actuatable film layer is disposed against the surface of the substrate or an actuated state wherein at least a portion of the flexible layer and a corresponding portion of the actuatable film layer are deflected into a corresponding void volume thus forming a fluidic volume between the deflected portion of the actuatable film layer and the surface of the substrate. In the actuated state, there is a fluidic gap between immediately adjacent void volumes formed by a thinned region of the flexible layer at a point of contact with a top surface of a wall section. A method of transporting fluid using the channel-less microfluidic pump is described.

Start-stop engine systems for a turbocharged engine have a bypass with fluid flow from upstream of the compressor or downstream of the compressor to a position between the throttle and the engine, or from between the compressor and throttle to a position upstream of the compressor with a Venturi device in the bypass. A device requiring vacuum is in fluid communication with a suction port of the Venturi device. An electronic vacuum pump is added that is in fluid communication with the device requiring vacuum or with the Venturi device. The electronic vacuum pump is operated during a stop condition of the start-stop engine to replace the vacuum generated by the Venturi device or to provide a pressure drop across the Venturi device so the Venturi device continues to generate vacuum for the device requiring vacuum.

The present invention provides an eccentric roundel structure for four-booster-chamber diaphragm pump. The eccentric roundel structure is a truncated-cylinder eccentric roundel in an eccentric roundel mount. The truncated-cylinder eccentric roundel characteristically comprises an annular positioning dent, a truncated cylinder peripheral and a sloped top ring created from the annular positioning dent to the truncated cylinder peripheral to replace a conventional rounded shoulder. By means of the sloped top ring, the oblique pull and squeezing phenomena of high frequency incurred by the rounded shoulder in a conventional tubular eccentric roundel are completely eliminated. Thus, not only the durability of the four-booster-chamber diaphragm pump for sustaining the pumping action of high frequency from the truncated-cylinder eccentric roundels is mainly enhanced but also the service lifespan of the four-booster-chamber diaphragm pump is exceedingly prolonged.

A fluid energy machine for imparting energy to a fluid. A channel contains a fluid flow. A flexible membrane extends the length of the channel and has a width generally corresponding to the inside width of the channel. A drive actuator at the input end of the channel imparts an activating force to the membrane at the input end of the channel, causing a transverse wave to propagate along the membrane and drive fluid through the channel.

A motor-less pump includes: (a) a housing having an inlet provided to allow fluid flow into the housing and an outlet provided to allow fluid flow out of the housing; (b) an elastic diaphragm positioned in the housing such that motion in the elastic diaphragm drives the fluid flows at the inlet and the outlet of the housing; and (c) one or more electromechanical polymer (EMP) actuators each being provided on a surface of the elastic diaphragm, wherein the mechanical responses to electrical stimuli applied on the EMP actuators cause the motion in the diaphragm. The EMP actuators may include one or more bimorphs.

A porous membrane for use in an electroosmotic pump for pumping a fluid by electroosmotic transport, the porous membrane comprising: first and second opposite surfaces and a net fluid flow direction extending in the porous membrane between said opposite surfaces, wherein when a given amount of charge flows through the porous membrane from the first to the second opposite surface more electroosmotic transport of the fluid will occur than when the same amount of charge flows through the porous membrane from the second to the first, opposite surface.

Depicted and described herein is a diaphragm pump (1) for conveying a gaseous and/or liquid medium, having at least one deformable membrane (2) for changing the size of a work chamber (3) of the diaphragm pump (1), and having at least one actuating unit (4) for deforming the membrane (2) by means of applying contact-free force to the membrane (2) using a magnetic field, wherein the membrane (2) comprises and/or consists of a material which is magnetic and/or magnetizable, and the actuating unit (4) features at least one magnetic and/or magnetizable actuating means (7). According to the invention, the actuating unit (4) is rotatably mounted and the membrane (2) is arranged circumferentially with respect to the actuating unit (4), wherein, in a dead point position of the membrane (2), the polarization direction of the magnetic field generated between the material of the membrane (2) and the actuating means (7) is oriented in a direction radial to the axis of rotation of the actuating unit (4).

A positive displacement pump includes a drive unit and a pump unit. The pump unit comprises at least one inline valve unit, a connecting and/or spacing device, and a pair of flanges which are connected to each other via the connecting and/or spacing device. In an operating position, the at least one inline valve unit is clamped between the pair of flanges. The at least one inline valve unit is configured to be displaced without removing the connecting and/or spacing device.

A channel-less microfluidic pump includes a cartridge including a substrate and an actuatable film layer disposed on the substrate, and a manifold having at least three actuatable void volumes separated by a plurality of wall sections and an actuatable flexible layer disposed on the manifold interfacing the actuatable film layer. In operation, the pump can be in an unactuated state wherein the actuatable film layer is disposed against the surface of the substrate or an actuated state wherein at least a portion of the flexible layer and a corresponding portion of the actuatable film layer are deflected into a corresponding void volume thus forming a fluidic volume between the deflected portion of the actuatable film layer and the surface of the substrate. In the actuated state, there is a fluidic gap between immediately adjacent void volumes formed by a thinned region of the flexible layer at a point of contact with a top surface of a wall section. A method of transporting fluid using the channel-less microfluidic pump is described.