Abstract: A pump includes a housing defining an interior volume, a diaphragm partitioning the interior volume into a pumping chamber and an actuating chamber, a diaphragm support associated with the actuating chamber and configured to limit movement of the diaphragm, and a dispersion element coupled to the housing. The dispersion element is configured to laterally distribute a fluid within the pump.

Abstract: A control system for controlling electromagnetic pumps, such as electromagnetic driven membrane pumps, has at least one microprocessor and at least one sensor, the microprocessor controlling the power supply to at least one electromagnet whose changes in emitted magnetic field causes at least one moving part, directly or indirectly, to perform an oscillating pumping movement. The control system has at least one positioning sensor which senses the moving part's position in the electromagnetic driven pump. By use of the positioning sensor's measurements, the pump can be controlled with great accuracy. A method for controlling electromagnetic pumps is also provided.

Abstract: The pump is provided with a plurality of pumping chambers and electrically activatable valves. An elastic membrane is arranged in each pumping chamber and divides the same into a first and a second chamber section. Each valve is connected to the second chamber section of a pumping chamber. When a pressure drop is applied over the valve and the valve is activated (i.e. opened), the pressure in the second chamber section changes, which causes the membrane to move, which in turn leads to a change of the volumes of both chamber sections. This e.g. allows to pump well-defined amounts of fluid from the chamber sections to a drug dispensing device.

Abstract: One or more techniques and/or systems are disclosed for increasing compressed air efficiency in a pump that utilizes an air efficiency device in order to optimize the amount of a compressed air in the pump. The air efficiency device may allow for controlling the operation of the air operated diaphragm pump by reducing the flow of compressed air supplied to the pump as the pump moves between first and second diaphragm positions. A sensor may be used to monitor velocity of the diaphragm assemblies. In turn, full position feedback is possible so that the pump self-adjusts to determine the optimum, or close to optimum, turndown point of the diaphragm assemblies. As such, air savings are achieved by minimizing the amount of required compressed air.

Abstract: A compressing diaphragm pump having abnormal pressure preventing features for spray use has a hollow tubular air discharge assembly having a plunger body and compressed spring as well as an air passage pierced at the wall of the water exit port and an air discharge orifice pierced of the central top surface of the air discharge assembly for connecting with the plunger body. When air is mixed within the pressurized water, the resilient force of the compressed spring is bigger than the water pressure of the pressurized water. This allows the air mixed in the pressurized water to get into the air passage and pass the plunger opening of the plunger body via through pore, and is dispelled out of the upper hood via the air discharge orifice of the air discharge assembly.

Abstract: A diaphragm pump for a seat adjusting device comprises a diaphragm and a valve member which define a pump chamber therebetween. An inlet valve and an outlet valve are formed on the valve member. A pressure chamber is in fluid communication with the outlet valve and receives fluid discharged from the pump chamber via the outlet valve. One of the diaphragm and the valve member comprises a valve membrane of a pressure relief valve integrated in the pump. The valve membrane is integrally formed with the one of the diaphragm and the valve member. The valve membrane is moveable between a first configuration in which the valve membrane closes a pressure relief channel and a second configuration in which the valve membrane opens the pressure relief channel to allow fluid to be discharged from the pressure chamber.

Abstract: A diaphragm pump (10), in particular for use as a detergent dosage pump, comprises a pump housing (12) with at least a first check valve (14) and a second check valve (16), a fluid chamber (18), a diaphragm (20) defining a wall of the fluid chamber (18) and reciprocatingly movable, driving means (28) with a driving shaft (30) for reciprocating said diaphragm (20), a control unit (36), wherein the driving means (28) is connected to the diaphragm (20) by an eccentric (26) and a con rod (24), wherein the driving means (28) is configured as a gearless drive to directly reciprocate the diaphragm (20). The diaphragm pump (10) according to the invention offers increased cost efficiency and further it is possible to increase the dosing capabilities of the diaphragm pump (10).

Abstract: Embodiments described herein provide systems and methods for high viscosity pumps including a noncompliant filter. One embodiment can include a multi-stage pump comprising an pump inlet flow path, a pump outlet flow path, a feed stage in fluid communication with the pump inlet flow path, a dispense stage in fluid communication with the feed stage and the pump outlet flow path, a noncompliant disposable filter for high viscosity fluid in a flow path between the feed stage and the dispense stage and a set of valves to selectively allow fluid flow through the multi-stage pump.

Abstract: This invention provides a diaphragm pump that decreases the number of components or improves workability in assembling. A crank (4) to which the output shaft (2a) of a motor (2) is pivotally attached has, in its upper surface, a ring-shaped insertion groove (5) with respect to the output shaft (2a) as the center. A projecting driving shaft (9b) is formed integrally with a driver (7). When the lower end (9c) of the driving shaft (9b) is inserted into the insertion groove (5), the axis (9d) tilts. When the crank (4) rotates, an engaging portion provided in the insertion groove (5) engages with the lower end (9c). The driving shaft (9b) rotates while changing the tilt direction of the axis (9d) following the rotation of the crank (4). Hence, when a diaphragm portion (12a) attached to the drive element (7a) of the driver (7) moves upward/downward, a pump chamber (18) expands/contracts so that a pump action is obtained.

Abstract: A fluid sending apparatus includes a signal generator that generates a signal including a signal component that has a one-sided waveform and is composed of a rising component in a positive voltage direction, a falling component in the positive voltage direction, and a vortex ring formation time component T, and a damping component for driving for a predetermined time with a voltage less than or equal to one-half of a voltage in the positive voltage direction, the waveform of each of the signal component and the damping component corresponding to a single wave.

Abstract: A fluid pump comprising a chamber which, in use, contains a fluid to be pumped, the chamber including a main cavity having a substantially cylindrical shape bounded by first and second end walls and a side wall and a secondary cavity extending radially outwards of the main cavity, one or more actuators which, in use, cause oscillatory motion of the first end wall in a direction substantially perpendicular to the plane of the first end wall, and whereby, in use, the axial oscillations of the end walls drive radial oscillations of the fluid pressure in the main cavity, and wherein the secondary cavity spaces the side wall from the first end wall such that the first end wall can move relative to the side wall when the actuator is activated.

Abstract: The present invention addresses the need for a water pump that may be constructed from inexpensive materials available even in impoverished areas. The pump uses a simple rocking motion to pump water and can pump significant amounts of water from sources that otherwise could not be reached. In a preferred embodiment, the pump comprises three concrete chambers, a pumping platform adapted to rock in a see-saw fashion, and a plurality of valves to control the flow of water. The first two chambers contain diaphragms that, as a result of rocking the pumping platform, draw liquid into the chambers and force liquid from those chambers into the third chamber. Two valves selectively permit liquid to be drawn into the first and second chambers, and prevent the liquid from exiting the chambers and returning to the source. Third and fourth valves allow liquid to flow from the first and second chambers into the third chamber, and prevent the liquid in the third chamber from flowing back into the first or second chambers.

Abstract: A pump includes a molded housing configured with a rear endbell portion to receive an armature and bearing, an intermediate motor portion to receive a motor shell and magnets arranged around the armature, and a front endbell portion to receive a diaphragm assembly having a diaphragm support plate supporting a diaphragm, the rear endbell portion, the intermediate motor portion and the front endbell portion being configured as an integrated molded housing unit, the diaphragm having two circumferential diaphragm sealing surfaces. The pump also includes an upper housing configured to assemble and couple to the molded housing so as to form a circumferential fluid-tight sealing arrangement that is configured between the front endbell portion and the upper housing on only one end of the pump.

Abstract: A magnetic circuit for a voice coil, comprising, a magnet cup with a one sided open cylindrical shape with a base. The magnetic circuit further includes a conical magnet with a side including a partial conical shape. The magnetic circuit includes a pole shoe which has a side with a recessed conical shape corresponding to the conical shape of said magnet. The magnet cup, the conical magnet and the pole shoe are stacked so that the conical magnet is centrally arranged on the base inside said magnet cup, the pole shoe is arranged on the conical magnet so that the side with a recessed conical shape of the pole shoe is in contact with the side with a conical shape of the conical magnet, such that an air gap is obtained between an inner wall surface of the magnet cup and the stacked conical magnet and the pole shoe.

Abstract: Disclosed is a motor-pump assembly (1) for a brake actuating device of a motor vehicle brake system with a pneumatic brake booster. An electric motor (3) drives a double diaphragm pump (2) with two working diaphragms (4) which are located opposite one another. Air expelled from the working spaces (7) is directed into an interior space (22) surrounding a crank drive (8) of the pump housing (5). An air outlet unit (23, 53) has a filter housing (32, 54), a filter (33, 59), an air outlet cover (34, 56), a valve holding element (38, 70) and a valve body (31). A partition wall (37, 55) deflects the air emerging from the interior space (22) in the air outlet unit (23, 53 between the filter housing (32, 54) and the air outlet cover (34, 56), with an integrally molded valve holding element (38, 70).

Abstract: A pump having an undulating diaphragm mounted for undulating between two end plates under drive from at least one electromagnetic actuator in order to transfer a fluid between an inlet of the pump and an outlet of the pump. The pump includes adapter means connecting the diaphragm support to a movable portion of the actuator in order to shorten the stroke of the movable mass of the actuator such that its stroke is shorter than the stroke of the diaphragm support.

Abstract: An oscillating diaphragm fan having a plurality of subunits which each have an oscillating diaphragm that is excited by a magnetic system in an actuator chamber, wherein the air pulsation generated by oscillating diaphragm is discharged outwardly, the actuator chambers of the subunits are connected via means for compensating pressure and are encapsulated outwardly, and the magnetic systems of the subunits are excited out of phase with each other.

Abstract: A membrane micropump includes a vibration chamber, at least one flow guide, at least one fluid inlet, at least one fluid outlet, at least one inlet rectifier, at least one outlet rectifier, a vibration membrane and an actuator. The vibration chamber includes at least one chamber inlet and at least one chamber outlet. The flow guide can be connected to the chamber inlet, the vibration chamber, the chamber outlet or in the vibration chamber, or it can have more pairs to enhance the effects. The inlet rectifier connects the chamber inlet to the fluid inlet. The outlet rectifier connects the chamber outlet to the fluid outlet. The vibration membrane is disposed on the vibration chamber. The actuator is connected to the vibration membrane to reciprocate the vibration membrane, enabling fluid to flow into the vibration chamber via the fluid inlet and flow out thereof via the fluid outlet.

Abstract: A piezoelectric micro-blower capable of efficiently conveying compressive fluid without use of a check valve and ensuring a sufficient flow rate. The micro-blower has a blower body with a first wall and a second wall. Openings are formed in the respective walls and face a center of a diaphragm. An inflow path allowing the openings to communicate with the outside is formed between the walls. By applying a voltage to a piezoelectric element to cause the diaphragm to vibrate, a part of the first wall close to the first opening vibrates. Thus, gas can be drawn from the inflow path and discharged from the opening in the second wall.

Abstract: A synthetic jet ejector (101) is provided herein which comprises a diaphragm (119), a first voice coil (121) disposed on a first side of the diaphragm, and a second voice coil (123) disposed on a second side of the diaphragm.

Abstract: A disposable assembly for use with a sensor assembly comprises a body, a flow restricting element, and a fluid pressure membrane. The body has a lid portion and a base portion. The body defines a fluid flow passage that forms an inlet and an outlet. The flow restricting element is positioned in the fluid flow passage between the inlet and the outlet. The membrane is located between the lid and base portions along the fluid flow passage. A reinforcing structure, such as a ring or a rigid disk, is positioned between the fluid pressure membrane and the lid portion to provide increased resistance to pressure in the fluid flow passage. The ring or disk can be a separate component or formed on the membrane. The membrane thickness adjacent to sensor access openings in the lid portion can be increased for pressure resistance, too.

Abstract: Embodiments of the present invention provide pumps with features to reduce form factor and increase reliability and serviceability. Additionally, embodiments of the present invention provide features for gentle fluid handling characteristics. Embodiments of the present invention can include a pump having onboard electronics and features to prevent heat from the onboard electronics from degrading process fluid or otherwise negatively impacting pump performance. Embodiments may also include features for reducing the likelihood that fluid will enter an electronics housing.

Abstract: A diaphragm pump comprising a housing for receiving and securely holding a motor, the housing comprising an elongate portion having a closed end and an open end, the elongate portion being adapted to securely receive and house a motor; and a collar portion being provided at the open end of the elongate portion; a cover for the housing, the cover being adapted to engage with the housing; a diaphragm plate extending across the open end of the housing between the collar portion of the housing and the cover and being secured therebetween when the cover is engaged with the collar portion of the housing. The diaphragm pump also includes a wobble plate positioned within the collar portion of the housing.

Abstract: There is provided an electromagnetically driven fluid pump. Even if deviation of a center plate from the diaphragm arises, centering of the center plate is carried out during the work for setting the center plate to an oscillator. The diaphragm and the center plate are fixed to the oscillator by means of a screw member, the diaphragm has a rising portion fitting to a through-hole at the center of the center plate, and the center plate has a ring-shaped rib on its surface where the screw member is inserted. The screw member is formed integrally with a washer portion and a diameter of the washer portion is nearly the same as an inner diameter of a bottom surface of the rib and the washer portion is formed so as to press a part of the rib in the case of maximum deviation of the center plate from the diaphragm.

Abstract: A pump flexes a diaphragm to move fluid through a pump chamber. In one implementation, the diaphragm is conical shaped. In one implementation, the diaphragm extends across the pump chamber, wherein a passage extends from a first side of the diaphragm to a second side of the diaphragm supply fluid are being pumped by the diaphragm. In one implementation, a bypass passage extends from adjacent an inlet to adjacent an outlet of the pump chamber.

Abstract: An electromagnetic vibrating diaphragm pump capable of increasing pump efficiency by increasing the vibration amplitude of the vibration of diaphragms even when the pressure inside a compression chamber is high. Diaphragms are fixed to both end portions of an oscillator having magnets. AC driven electromagnets are provided in a manner to face the magnets of the oscillator. A frame adhered to the outer peripheries of the diaphragms covers the electromagnet side, and pump casings cover the opposite sides. The pump casing includes a compression chamber adjacent to the diaphragm, a suction chamber connected to the compression chamber via a suction valve and an exhaust chamber connected to the compression chamber via an exhaust valve, the suction chamber or the exhaust chamber being connected to the frame via a continuous hole.

Abstract: An electromagnetic vibrating diaphragm pump is provided which is safe even when a diaphragm of a diaphragm pump is damaged and liquid or flammable gas penetrates an electromagnetic drive. An electromagnet coil container containing electromagnet coils in an airtight manner is further provided inside a casing, preventing fluid which has penetrated into the space outside the electromagnet coil container from penetrating into the space inside the electromagnet coil container. The electromagnet coil container has a passage formed for an oscillator to move in reciprocation and the passage is formed of a partition wall outside the container. The electromagnetic coil container is configured to prevent fluid which has penetrated into the space inside the passage from penetrating into the space inside the electromagnet coil container.

Abstract: An electromagnetic vibrating diaphragm pump capable of preventing fluid such as air from leaking to an oscillator side. This diaphragm is sandwiched by an inner center plate and an outer center plate and is fixed by inserting the mounting screw parts of the oscillator into a through hole provided at the center of the outer and inner center plates. A cylindrical projecting portion is formed at the center of the inner center plate on its oscillator side, and this projecting portion is fitted into the concave groove formed at the ends of the supporting member of the oscillator so as to be sealed in an airtight manner with a ring-shaped elastic member inbetween.

Abstract: A pump module (4, 5, 6; 4?, 4?) includes a housing (14) that limits at least one channel (17) connecting at least one inlet with at least one outlet, an elastic membrane (18; 21; 22) extending in the housing in a flow direction, and a plurality of actuators located in the housing opposite each other on both sides of the at least one flow channel and forming actuation stages (A1-A6) arranged one after another in the flow direction, with a respective section of the elastic membrane being deflected and abutting a respective circumferential section of the at least one flow channel upon activation of an actuator of a respective actuation stage for forming a delivery chamber.

Abstract: An object of the present invention is to provide an electromagnetic vibrating diaphragm pump with a draining structure which is a simple structure and can easily drain water having flowed into the pump without providing a separate member for preventing inflow of water.

Abstract: A disposable pump head and canister assembly is provided having a disposable pump head having an upper housing with an input port and an output port, and being configured to be engaged to a motor so as to pump fluid into the input port, through the disposable pump head, and out the output port, the upper housing configured to couple to a support plate via a plurality of upper housing flexible tabs that snap fit to corresponding structure of the support plate and configured to be frictionally engaged to a motor so as to pump fluid into the input port, through the disposable pump head, and out the output port; and a canister having an exterior wall portion, a cover and a latching arrangement, where the exterior wall portion is configured so as to form an interior cavity dimensioned to receive the disposable pump head, and where the cover is configured to close and be latched to the exterior wall by the latching arrangement so as to frictionally engage the disposable pump head and the motor.

Abstract: One or more techniques and/or systems are disclosed for increasing compressed air efficiency in a pump utilizes an air efficiency device in order to optimize the amount of a compressed air in a pump. The air efficiency device may allow for controlling the operation of the air operated diaphragm pump by reducing the flow of compressed air supplied to the pump as the pump moves between first and second diaphragm positions. A sensor may be used to monitor velocity of the diaphragm assemblies. In turn, full position feedback is possible so that the pump self-adjusts to determine the optimum, or close to optimum, turndown point of the diaphragm assemblies. As such, air savings is achieved by minimizing the amount of required compressed air.

Abstract: This disclosure relates to medical fluid cassettes and related systems and methods. In some aspects, a medical fluid cassette includes a base and a magnetically attractive member overlying a fluid pump chamber of the cassette. The magnetically attractive member defines a cavity sized and shaped to receive a portion of a piston.

Abstract: In a method for adjusting a fluid control apparatus, in a pressing step, a piezoelectric pump is placed on a stage with a cover plate facing upward, the stage is moved up, and a center portion of a principal surface of the cover plate on a side opposite to a diaphragm is pressed with a pressing pin. As a result, the cover plate and the base plate are shaped so as to warp convexly toward the diaphragm side, and a portion joined to a flexible plate is pulled, such that the flexible plate is caused to warp convexly toward the diaphragm side. Thus, residual tensile stress occurs in a movable portion of the flexible plate. Therefore, due to the residual tensile stress, the tensile stress of the movable portion of the flexible plate is increased.

Abstract: A synthetic jet equipment is provided, including a base, a frame fixed to the base, a first member, a pump diaphragm, a second member, and a valve diaphragm. The pump diaphragm connects the first member to the frame, and the valve diaphragm connects the second member to the frame. The base, the frame, the first member, the pump diaphragm, the second member, and the valve diaphragm define a chamber forming an intake and an outlet. When the first member moves in a first direction, the second member moves in a second direction opposite to the first direction and the external air flows into the chamber through the inlet. When the first member moves in the second direction, the second member moves in the first direction, such that the air is exhausted from the chamber through the outlet.

Abstract: A membrane pump (1) has a pump housing, a membrane (4), which is mounted to the pump housing and delimits a pump chamber (8) inside the pump housing, an inlet (5) and an outlet (6) for feeding medium into and out from the pump chamber, and an actuating member (7) for moving the membrane back and forth between a first and a second position. The membrane, the inlet and the outlet are arranged in a first part (2) of the pump housing, the first part being detachably connected to a second part (3) of the pump housing, in which the actuating member is arranged. The membrane is detachably connected to the actuating member by a magnetic coupling, which has a first magnetic coupling part (9) fixed to the membrane and a corresponding second magnetic coupling part (10) fixed to the actuating member.

Abstract: A pump for pumping a medium from a suction side to a pressure side includes a filter arrangement. The filter arrangement includes an inflow path, a first outflow path, and a second outflow path. A hydrophobic membrane filter is arranged between the inflow path and the first outflow path. A hydrophilic membrane filter is arranged between the inflow path and the second outflow path. At least one section of the hydrophobic membrane filter and one section of the hydrophilic membrane filter are located opposite each other at a distance of no more than 1 mm so that a gas bubble that moves along with a medium flowing in the inflow path comes into contact with the hydrophobic membrane filter during the movement. The first and second outflow paths of the filter arrangement are connected to the suction side of the pump.

Abstract: A piezoelectric micro-blower includes an inner case to which a peripheral portion of a vibrating plate including a piezoelectric element is fixed such that a blower chamber is defined between the inner case and the vibrating plate and an outer case arranged to cover an outer periphery of the inner case with a gap therebetween. The inner case is elastically retained in the outer case by a plurality of connecting portions. A first opening is provided in a top plate portion of the inner case that faces a central portion of the vibrating plate, and a second opening is provided in a top plate portion of the outer case that faces the first opening. A central space is provided between the top plate portions, and fluid introduced from the outside is guided to the central space through the gap between the inner and outer cases. The vibrating plate is driven in a bending mode so that air is sucked into the central space and is discharged through the second opening.

Abstract: An actuator includes a first part having a magnetomotive element and configured to absorb heat up to at least a first temperature; a second part arranged so as to face the first part; a temperature-sensitive magnetic body provided between the first part and the second part and configured to move between a first position for contact with the first part and a second position for contact with the second part, the temperature-sensitive magnetic body having a Curie point lower than the first temperature and higher than a temperature of the second part; and a restoring part configured to restore the temperature-sensitive magnetic body from the first position to the second position.

Abstract: Diaphragm pump for delivering a fluid, in particular an exhaust-gas aftertreatment medium, such as an aqueous urea solution for example, comprising a working chamber (1) which is delimited by a working diaphragm (2) and which can be connected via a first valve (3) to an inlet (4) and via a second valve (5) to an outlet (6), and an electromagnet (7) which comprises a coil assembly (8) and an armature (9) which interacts with the coil assembly (8) and is operatively connected to the working diaphragm (2). According to the invention, the valves (3, 5) are configured in a valve plate (10) which is arranged between the coil assembly (8) and the armature (9). Exhaust-gas aftertreatment system having a diaphragm pump of this type.

Abstract: A method of dispensing a therapeutic fluid from a line includes providing an inlet line connectable to an upstream fluid source. The inlet line is in downstream fluid communication with a pumping chamber. The pumping chamber has a pump outlet. The method also includes actuating a force application assembly so as to restrict retrograde flow of fluid through the inlet while pressurizing the pumping chamber to urge flow through the pump outlet. A corresponding system employs the method.

Abstract: A motor/pump assembly for a motor vehicle brake system including a pump and a motor driving the pump, the pump having opposite working diaphragms which are, in each case, mounted between a pump casing and a cover and thereby delimit a space and which can be moved by a crank drive, the space being assigned, in each case, an inlet duct with an inlet valve and an outlet duct with an outlet valve. The outlet ducts are arranged in the covers and in the pump casing such that air displaced out of the spaces is conducted into an inner space surrounding the crank drive of the pump casing and that an air outlet unit be provided, which allows a low-noise blow-out of the air from the inner space as a result of the deflection of the air.

Abstract: The present invention provides a DC-AC frequency converter type mucus suction device having an electromagnetic pump, the pressure and the flow generated in which could be changed to satisfy the requirement of the mucus suction device. The mucus suction device of the present invention comprises an electromagnetic pump, a suction device and a frequency converter circuit, wherein the frequency converter circuit at least comprises an oscillator circuit, a bistable circuit, and a push-pull circuit, wherein the electromagnetic pump is supplied with AC obtained from the oscillation of DC in the frequency converter circuit, wherein the swing speed, frequency and amplitude of the swing arms vary with the oscillation frequency of the oscillator circuit, such that the suction pressure and the suction flow of the electromagnetic pump could further be changed to obtain the most appropriate pressure and flow of the mucus suction device.

Abstract: A fuel pump includes a housing having therein a suction passage and a pressurization chamber into which fuel from the suction passage flows, a plunger held in the housing to be reciprocable so as to pressurize the fuel flowing into the pressurization chamber, and a diaphragm device located in a suction chamber that is provided in the suction passage. The diaphragm device includes a pair of first and second diaphragms that are arranged to define an inner space therebetween and air-tightly sealed at its entire peripheries. A mass addition member may be attached to an inside surface of at least one of the first and second diaphragms, so that the first and second diaphragms with the mass addition member have different characteristic frequencies. Accordingly, pressure pulsation of the fuel in the suction chamber can be effectively reduced by the pulsation damper.

Abstract: A highly precise and extremely compact metering unit for fluid media has a pump, two valves, and a fluid communication base with two ports, pump and valve channels, and a pump chamber. The pump is mounted on the pump chamber. The pump channels communicate with the pump chamber and the valves. The valve channels communicate with the valves and the ports. The pump and the two valves are arranged one beside the other on the same side of the fluid communication base.

Abstract: The invention is a hydrogen generator including a pump for pumping a liquid from a reservoir to a reaction area, where the liquid reacts to produce hydrogen gas, and a fuel cell system including the hydrogen generator and a fuel cell stack. The pump is a diaphragm pump with mechanically operated liquid inlet and outlet valves that are opened by cam-operated pushrods, and the pushrods are isolated from the liquid flowpath through the pump by diaphragms. All valves in the liquid flow path between the liquid reservoir and the reaction area are mechanically operated valves.

Abstract: A two-cavity pump having a single valve in one cavity and a bidirectional valve in another cavity is disclosed. The pump has a side wall closed by two end walls for containing a fluid. An actuator is disposed between the two end walls and functions as a portion of a common end wall of the two cavities. The actuator causes an oscillatory motion of the common end walls to generate radial pressure oscillations of the fluid within both cavities. An isolator flexibly supports the actuator. The first cavity includes the single valve disposed in one of a first and second aperture in the end wall to enable fluid flow in one direction. The second cavity includes the bidirectional valve disposed in one of a third and fourth aperture in the end wall to enable fluid flow in both directions.

Abstract: A pump assembly includes a housing defining a working chamber, a water pump chamber and a waste pump chamber. A first diaphragm separates the water pump chamber and the working chamber. A second diaphragm separates the waste pump chamber and the working chamber. A common driver member interconnects the first diaphragm and the second diaphragm. Movement of the driven member to a first position creates a positive pressure in the water pump chamber and a negative pressure in the waste pump chamber. Movement of the driven member to a second position creates a negative pressure in the water pump chamber and a positive pressure in the waste pump chamber.

Abstract: A fluid mover includes a first dynamic armature attached to a flexible member and a second dynamic armature attached to a second flexible member. The fluid mover also includes a housing and first and second flexible members being attached to the housing so as to form a fluid chamber volume bounded by the housing and first and second flexible members. A stationary current carrying coil positioned between first and second armatures. The current carried by the coil generates a magnetic force acting on the armatures and wherein coil and armatures are positioned and configured so as to ensure that the instantaneous magnetic force experienced by the two armatures will always be identical regardless of the relative positions of the armatures and regardless of the time varying properties of the current.

Abstract: A piezoelectric pump is capable of reliably discharging gas and reliably transporting liquid even when intermittently driven. The piezoelectric pump includes a piezoelectric vibrator, a diaphragm deflected and deformed by the piezoelectric vibrator, a pump chamber including at least one wall surface defined by the diaphragm, an inlet through which liquid, gas, or a mixture of liquid and gas flows into the pump chamber, an outlet through which the fluid is discharged, and a liquid holding member arranged to provide a gap between the liquid holding member and the inner surface of the pump chamber and to maintain the liquid in the gap using capillary effect or surface tension. A flow passage plate includes a flow passage groove provided therein.