Abstract: A micropump underpressure control device, working in conjunction with a micropump having an inlet and an outlet. The micropump underpressure control device comprises a control valve and a transmission tube. The control valve is installed at a supply pipe leading to the micropump and further comprises a case with a membrane, a valve assembly, a connecting rod and a spring. The membrane is exposed to pressure from the outlet of the micropump and accordingly deformed, via the connecting rod controlling opening and closing of the valve assembly, so that working liquid is allowed to proceed to the inlet of the micropump or blocked. The transmission tube transmits pressure at the outlet of the micropump to the membrane. On an opposite side, the membrane is pressed on by working liquid and by the spring. Thus pressure at the inlet of the micropump is controlled, being kept smaller than or equal to pressure at the outlet of the micropump by a fixed difference.

Abstract: An electromagnetic oscillating type pump for oscillating diaphragms connected to an oscillator through electromagnetic oscillation of the oscillator with magnetic body by utilizing magnetic interaction between an electromagnetic portion comprising one or a plurality of iron cores and the magnetic body. A frame portion of resin mold is formed by molding resin on an outer surface of the electromagnetic portion. It is possible to obtain electromagnetic oscillating type pumps capable of decreasing manufacturing costs and of exhibiting high acoustic insulating effects.

Abstract: The pump of the present invention preferably includes a housing having an inlet port, an outlet port and a chamber located in fluid communication with the inlet port and the outlet port. A diaphragm is sealingly secured in the chamber and, together with the housing, define a fluid passageway from the inlet port to the outlet port. An electromagnetic assembly or other driving device is preferably secured to the housing and is positioned to move the diaphragm in order to pump fluid through the pump. In some preferred embodiments, the electromagnetic assembly includes a plunger positioned and adapted to move the diaphragm against the biasing force of a spring. Improved diaphragms and diaphragm features are also disclosed, including a two-part diaphragm structure, diaphragm sealing portions for sealing the fluid chamber from driving and biasing assemblies of the pump, and inherently biased diaphragms.

Abstract: A pump assembly for an aquarium includes a water circulation pump having a first casing and an aeration pump having a second casing, wherein the aeration pump is operated by the magnetic field of a rotating magnetic shaft that is rotatably mounted in the water circulation pump. The first casing and the second casing are connected to each other. A lever in the aeration pump is reciprocated continually to draw air into the pump and discharge air into the aquarium due to the magnetic field of the rotating magnetic shaft so that the coil is unnecessary in the aeration pump. Consequently, the pump assembly can be marketed for a lower price and save energy when used.

Abstract: In a pump, a plurality of pump chambers are defined by a plurality of diaphragms. A pivotable member is attached to the diaphragms. A rotator is formed with a first hole having a first diameter, which is arranged eccentrically from a rotation center of the rotator, and a second hole having a second diameter smaller than the first diameter, which is formed in a bottom of the first hole. A shaft member connects the rotator and the pivotable member so as to convert a rotation of the rotator into a pivotal movement of the pivotable member for sequentially deforming each diaphragm to vary a volume of each pressure chamber. One end of the shaft member is fitted into the second hole.

Abstract: Methods and apparatus for electrostatically pumping fluids without passing the fluids through the electric field of the pump are contemplated. Electrostatic forces are preferably used to move the diaphragms in one direction, while elastic and/or other restorative forces are used to move the diaphragms back to their original un-activated positions. In some embodiments, this may allow fluid to be pumped without passing the fluid between actuating electrodes. This may be particularly useful when the fluids have dielectric, conductive, polar or other qualities that may affect traditional electrostatic pump performance. Pumps having various elementary cells are contemplated, including two-celled pumps disposed within a single chamber and pumps having greater numbers of cells wherein each cell is disposed within a different chamber.

Abstract: A diaphragm for a diaphragm pump is in the form of a vehicle tire. The vehicular tire has a first mounting face, a second mounting face and a circumferential tread portion positioned between first mounting face and the second mounting face. A first sealing disk is secured to the first mounting face of the tire. A second sealing disk is secured to the second mounting face of the tire. An inlet valve positioned on either the first sealing disk or the second sealing disk. An outlet valve is positioned on either the first sealing disk or the second sealing disk.

Abstract: The ejection orifice (7) of a micropump including a baseplate (3) of glass and a cover plate (4) of silicon and intended for ejecting small liquid drops, has a diameter of about 50 &mgr;m, and is located in the center of a flat front surface (12) which, in order to avoid accumulations of liquid in the region of the ejection orifice (7), is only 8 times the area thereof and, along a continuous circular edge, is adjacent a lateral surface (13) in the form of an envelope of truncated cone. The front surface (12) and the lateral surface (13) have a surface roughness of not more than N4 and are provided, for example, with a hydrophobic plasma polymer coating.

Abstract: This disclosure relates to a highly durable positive displacement pump capable of dry-priming and pumping of a liquid containing abrasive non-soluble material. The pump assembly comprises an internally pressurized diaphragm assembly secured to a pump bowl and a pump bowl tube. A suction inlet and discharge outlet are located at opposite ends of the pump bowl tube, the inlet and outlet are each configured to receive a valve that limits flow of the liquid to a single direction. The internally pressurized diaphragm assembly comprises an upper diaphragm positioned atop a lower diaphragm wherein a cavity is formed between the diaphragms that is pressurized thereby reducing fatigue failure inducing stresses. Reciprocating axial movement of the internally pressurized diaphragm assembly, produced by a drive means, suctions the liquid in through the suction inlet and then discharges the liquid through the discharge outlet.

Abstract: A casing body is formed with a vent hole. The casing body has an inner face formed with a plurality of grooves respectively communicated with the vent hole. A plurality of diaphragms are respectively inserted into the grooves to form a plurality of pump chambers. An actuator actuates the diaphragms to compress or decompress the pump chambers.

Abstract: Provided is a low-noise, long-life electromagnetic blower that has a simple, low-priced configuration and can realize two different outputs, high and low. When the electromagnetic blower is operated with low output, coils of an electromagnet are connected in series with each other, and an alternating current is supplied from an AC power source. When the blower is operated with high output, on the other hand, current is supplied to the one coil only. In the case where the electromagnetic blower is used for sewage disposal, the electromagnetic blower is operated with low output during aeration and with high output during reverse cleaning operation. Thereupon, the electromagnetic blower can operate with low noise during aeration, and the efficiency of reverse cleaning can be improved. In order to operate the electromagnetic blower with high output, moreover, the coils of the electromagnet may be connected in parallel with each other.

Abstract: A pump and methods for compressing a fluid are provided that comprise a pump head comprising a flexible metal diaphragm attached to a rigid compression chamber. Fluid compression is provided within the rigid compression chamber when the flexible diaphragm is mechanically oscillated back and forth by a linear motor operated at a drive frequency that is at or below the mechanical resonance of the moving parts, mechanical springs and gas springs. Tuned ports and valves allow low-pressure fluid to enter and high-pressure fluid to exit the compression chamber in response to the cyclic compressions. The linear resonance pump provides high frequency operation, small diaphragm displacements, and high compression ratios for gases.

Abstract: A pump (10) comprising an inlet (12), an outlet (14) and a pumping chamber (16) between the inlet (10) and the outlet (12). The pumping chamber (16) has first and second opposed interior pumping chamber surfaces (18, 20) extending from the inlet (12) to the outlet (14) in a pumping direction (PD). The pump (10) also has a flexible diaphragm (22) between the first and second pumping chamber surfaces (18, 20) which is adapted to substantially sealingly separate the first and second pumping chamber surfaces (18, 20) from one another. The diaphragm (22) has first and second layers (24, 26) adjacent the first and second pumping chamber surfaces (18, 20) respectively. A means (38) is also provided which induces substantially sinusoidal motion in the diaphragm (22) in the pumping direction (PD) without inducing relative movement between the diaphragm (22) and the pumping chamber (16) in the pumping direction (PD).

Abstract: A pump having a main pump body including a casing to which a fluid is supplied, and a pump section, an input valve section, and an output valve section which are provided opposingly to one surface in the casing. Each of the pump section, the input valve section, and the output valve section has an actuator section. The input valve section, the pump section, and the output valve section are provided opposingly to the back surface of the casing for selectively forming a flow passage on the back surface of the casing in accordance with selective displacement action of the input valve section, the pump section, and the output valve section in a direction approaching or separating from the back surface of the casing. The fluid is controlled for its flow in accordance with the selective formation of the flow passage.

Abstract: A fluid discharging device is provided with diaphragm members 20 and 30. The diaphragm member 30 being a valve member comprises an outlet 35 and a suction passage opening and closing portion 33, and can be moved forward and backward relative to the diaphragm member 20 being a pump member. The diaphragm member 20 comprises an outlet opening and closing portion 25 capable of opening and closing the outlet 35 and a measuring portion 26 capable of changing the volume of a measuring space 42. An outlet opening and closing means 50 opens and closes the outlet 35 by moving the outlet opening and closing portion 25 backward and forward relative to the outlet 35, and opens a liquid suction passage 40 by detaching the suction passage opening and closing portion 33 from the diaphragm member 20. A diaphragm moving means 55 changes the volume of the measuring space 42 by moving the measuring portion 26 forward and backward.

Abstract: A vest for a human body has an air core coupled to a pulsator operable to subject the vest to air pressure pulses which applies and releases pressure to the human body. The vest has a cover having a pocket accommodating the air core. The pulsator has diaphragms connected to a d.c. electric motor with a rotary to reciprocating motion transmitting mechanism operable to generate air pressure pulses which are transmitted to the air core which applies repetitive pressure pulses to the human body.

Abstract: A pump and methods for compressing a fluid are provided that comprise a pump head comprising a flexible metal diaphragm attached to a rigid compression chamber. Fluid compression is provided within the rigid compression chamber when the flexible diaphragm is mechanically oscillated back and forth by a linear motor operated at a drive frequency that is at or below the mechanical resonance of the moving parts, mechanical springs and gas springs. Tuned ports and valves allow low-pressure fluid to enter and high-pressure fluid to exit the compression chamber in response to the cyclic compressions. The linear resonance pump provides high frequency operation, small diaphragm displacements, and high compression ratios for gases.

Abstract: An active pneumatic component for pneumatically controlling a hydraulic bearing includes an electrically driven oscillating membrane pump combined with a multiway valve into an integrated structural component, in such a way that an armature which activates the oscillating membrane also controls the valve functions of the multiway valve. The valve also containing the inlet and outlet valves of the pump.

Abstract: Disclosed herein is a wobble diaphragm pump having a housing with an open neck. A wobble piston can be passed through the open neck and fit onto the pump motor shaft. A separate support ring is fastened to the housing to close the open neck and provide a circumferential support surface for the diaphragm. The support ring also includes locking projections that mate with recessed features in the housing and a valve head to properly align and unite these components during assembly.

Abstract: The present invention relates to a micropump which is driven by movement of a liquid drop based upon continuous electrowetting actuation. The continuous electrowetting means a phenomenon that the liquid drop moves as the surface tension of the liquid drop is electrically varied in succession. When a tube in which electrolyte and a liquid metal drop are inserted is applied with voltage having periodically changing polarity via metal electrodes, the surface tension of the liquid metal is varied so that the liquid metal drop reciprocates in the tube generating pressure or force, which is used as a driving force of the micropump. The micropump is operated in a low voltage and consumes a small amount of electric power.

Abstract: A microfluidic pump having a substrate with a pump chamber and at least one channel in communication with the pump chamber for transporting a substance into or out of the pump chamber. A flexible diaphragm overlies the pump chamber, and a magnetic member is attached to the diaphragm. A magnet, such as an electromagnet, is positioned to attract and repel the magnetic member, thereby actuating the diaphragm, and causing a substance to be drawn into or out of the channel. A uni-directional or bi-directional check valve can be positioned in the channel to prevent backflow into the pump chamber. A control system can be coupled to the pump to adjust actuation rate of the diaphragm.

Abstract: The pump of the present invention preferably includes a housing having an inlet port, an outlet port and a chamber located in fluid communication with the inlet port and the outlet port. A diaphragm is sealingly secured in the chamber and, together with the housing, define a fluid passageway from the inlet port to the outlet port. An electromagnetic assembly or other driving device is preferably secured to the housing and is positioned to move the diaphragm in order to pump fluid through the pump. In some preferred embodiments, the electromagnetic assembly includes a plunger positioned and adapted to move the diaphragm against the biasing force of a spring. Improved diaphragms and diaphragm features are also disclosed, including a two-part diaphragm structure, diaphragm sealing portions for sealing the fluid chamber from driving and biasing assemblies of the pump, and inherently biased diaphragms.

Abstract: A fluid dispensing system is provided which has a first diaphragm pump, a filter connected to receive the discharge of said first pump, and an accumulator/second diaphragm pump connected to receive the discharge of said filter. Hydraulic fluids pumped by cylinder/piston/stepper assemblies independently actuate each of the diaphragm pumps, providing accurate, controllable and repeatable dispense of the subject fluid. There is also structure operable to suck back fluid from downstream of the second pump.

Abstract: A portable apparatus for ventilation support to persons with respiratory distress is provided with a compressed air pump. The pump may be connected to the mouth or the nose via a tube for generation of pressure pulses with an individually adaptable air volume. The pump comprises a rigid container having two symmetrical halves and with a flexible membrane which is located as a laterally reciprocating diaphragm between the two container halves. These are provided with check valves permitting ambient air to be fed into the pump and from the pump into the tube while the membrane wall is moved, for generation of a pressure pulse. The pump is provided with a flexible pull device for reciprocating operation of the membrane in the container. The pull device extends via pulley wheels to a driving device located substantially in the same plane as the container and beside it.

Abstract: A method of producing a pump body having an inlet opening provided with an inlet valve (106) and an outlet opening provided with an outlet valve (108), said method comprising as a first step the step of structuring a respective first main surface of a first and of a second semiconductor disc (200) for defining a valve flap structure (202) of the inlet valve and a valve seat structure (204) of the outlet valve in the first disc and a valve flap structure of the outlet valve and a valve seat structure of the inlet valve in the second disc. Following this, a valve flap well structure (206; 216) and a valve opening well structure (208; 218) are formed in a predetermined relationship with the valve flap structures and the valve seat structures in a respective second main surface of the first and of the second semiconductor disc.

Abstract: A vacuum pump has a housing enclosing a pump mechanism. The pump mechanism has an electrical motor enclosed in a motor chamber. Air pumped by the pump mechanism is exhausted into the enclosed motor chamber to cool the motor and then exhausted out of the motor chamber and pump housing. The relatively higher density air passing through the motor chamber and housing improves convective cooling of the pump motor.

Abstract: An electromagnetic diaphragm pump has two compression sections operated by an AC. Each of the compression sections comprises an oscillator disposed within a housing and holding a permanent magnet, a pair of diaphragms each having a peripheral portion fixed to the housing and a central portion fixed to an end portion of the oscillator, a pair of field cores sandwiching the oscillator and having magnetic poles displaced relative to the permanent magnet by a predetermined amount, coils for producing magnetic fluxes at the field cores, and compression chambers opposed to end portions of the oscillator, one of walls of each of the compression chambers being formed by an associated one of the diaphragms. The field cores have the magnetic poles magnetized by the AC supplied to the coils, whereby the permanent magnet is alternately attracted and repelled by the magnetic poles to vibrate the diaphragms and to vary the volumes of the compression chambers. The two compression chambers share one field core.

Abstract: A miniature pump equipped with: a pump chamber communicated with a suction port by way of a check valve and communicated with a discharge port by way of another check valve; a driving portion for performing a pump function by increasing and decreasing a volume of the above described pump chamber; a driving plate attached to the above described driving portion for reciprocating the driving portion; a rotating plate fixed to an output shaft of a motor; a ball disposed at a location which is between the above described driving member and the above described rotating plate, and apart from the above described output shaft; and means for applying a force to a surface of the above described driving plate on a side of the above described rotating plate for bringing the above described driving plate into close contact with the above described ball, in which an inclined direction of the above described driving plate is continuously changed by a movement caused due to rotations and revolutions of the above described bal

Abstract: Disclosed herein is a fuel metering pump for delivering fuel to rocket or jet engine having a motor driven face cam and a pair of reciprocating rolling diaphragm pump mechanisms movable through opposite suction and pump strokes. The face cam has a ramping cam surface that extends radially more than 180 degrees. This permits both pump mechanisms to be simultaneously in the pump stroke for a portion of the pump stroke so that they alternately reciprocate through the suction and pump strokes at essentially a constant velocity, thereby providing an essentially non-pulsating flow of fuel to the engine.

Abstract: A miniature diaphragm pump includes a motor unit, a compression portion, and an air collection portion. The output air is injected into the inner space of the pump through the air inlet formed at the motor unit, and the air exits from the pump through an air output port provided at the air collecting portion. A pair of air bags are provided at the compression portion which are compressed by the ends of a cross-bar in alternating fashion and a system of check valves is arranged in such a manner that to prohibit a back flow of air. A follower rod extending from the cross bar is inserted into an eccentric hole formed on a rotation member in the motor unit to make eccentric circular motion when the motor rotates in order to compress one of the air bags at a time in order to send air to the air output port of the air collection portion of the pump.

Abstract: An air pump apparatus that can allow easy change of the number of pump mechanisms contained therein and easy connection between the pump mechanisms is disclosed. The air pump apparatus comprises a pump mechanism and a pump case assembly forming an air-tight pump chamber in that the pump mechanism is contained.

Abstract: A pressurized air supplying device is coupled to the DC electric power of the vehicle for supplying a pressurized air to a massage device of the vehicle. The pressurizing device includes two membranes secured to two sides of a housing and each having a peripheral portion secured to the housing with a casing. A follower is secured between the membranes. A motor is secured to the housing and has an eccentric axle slidably engaged through the follower to actuate the follower and the membranes to pressurize the air and to generate a pressurized air to the massage device.

Abstract: The inventive device consists of a disk which can be rotated around a central axis, a wobble pin which is mounted in the disk so that can rotate around an axis which is arranged at an angle in relation to the plane, of said disk, a swivel pin which is secured to the wobble pin at an angle in relation to the axis thereof, and a fastening device which prevents the swivel pin from rotating around the axis of the disk. This mechanism forms a gear enabling a rotational unidirectional movement to be translated into a back-and-forth movement in applications where limited height is available. The preferred area of application is in implantable blood pumps.

Abstract: The present invention is directed to a multiport metering pump that can completely deliver a very small volume of liquid. The multiport metering pump includes a number of ports (or valve units), each of which can be used as either an outlet valve or an inlet valve. The multiport metering pump includes: a central gallery; a displacement unit; multiple valve units; and multiple conduits that respectively connect the displacement unit and the valve units to the central gallery. The displacement unit and the valve units communicate with the central gallery, and any of the valve units can be used as an inlet valve or outlet valve for the liquid delivery.

Abstract: A fuel pump which has excellent heat resistance and salt resistance, is low in cost and light in weight, and which is free from fuel leakage. The fuel pump has a bottom body formed of a thermosetting resin such as bakelite material which has heat resistance and strength, and a top body and a cover formed of a thermoplastic resin. The top body and the cover 16 are assembled with a seal member such as a gasket held between the top body and the cover, and the top body and the bottom body 12 are fixed together by a fixing element. Thereby, the main body portions of the fuel pump are constituted of resin.

Abstract: A reciprocating electromagnetic pump comprising a coil wound about a bipolar or tripolar core, a diaphragm structure mechanically coupled to at least one arm with a magnet attached to one end of the arm and a controller electronically connected to the coil. The arm is vibrated under the influence of a periodic electromagnetic field to produce flow. The flow of current through the electromagnet is interrupted so that the magnets are impelled during either a vacuum or a pressure stroke, but are not impelled during the reciprocal stroke. A microprocessor houses the controller which analyzes amplitude and frequency components of a signal produced in the electromagnet coil during the reciprocal stroke to provide a pump flow rate, a pumping efficiency, a pumping load and a height of the fluid column into which the pump mechanism is operating.

Abstract: A method of fabricating an elastomeric structure, comprising: forming a first elastomeric layer on top of a first micromachined mold, the first micromachined mold having a first raised protrusion which forms a first recess extending along a bottom surface of the first elastomeric layer; forming a second elastomeric layer on top of a second micromachined mold, the second micromachined mold having a second raised protrusion which forms a second recess extending along a bottom surface of the second elastomeric layer; bonding the bottom surface of the second elastomeric layer onto a top surface of the first elastomeric layer such that a control channel forms in the second recess between the first and second elastomeric layers; and positioning the first elastomeric layer on top of a planar substrate such that a flow channel forms in the first recess between the first elastomeric layer and the planar substrate.

Abstract: The ejection orifice (7) of a micropump including a baseplate (3) of glass and a cover plate (4) of silicon and intended for ejecting small liquid drops, has a diameter of about 50 &mgr;m, and is located in the center of a flat front surface (12) which, in order to avoid accumulations of liquid in the region of the ejection orifice (7), is only 8 times the area thereof and, along a continuous circular edge, is adjacent a lateral surface (13) in the form of an envelope of truncated cone. The front surface (12) and the lateral surface (13) have a surface roughness of not more than N4 and are provided, for example, with a hydrophobic plasma polymer coating.

Abstract: A micromachined pump apparatus 1 includes a substrate 2 having upper and lower surfaces and a plurality of lengthwise arranged apertures 2A-2E, each of which has an upper surface opening and a lower surface opening. A plurality of diaphragms 6A-6E close the upper surface openings of the apertures 2A-2E, respectively. A guide plate 3 is fixedly mounted on the upper surface of the substrate 2 and defines a passage 3a through which an object fluid is moved by cooperating with the diaphragms on the upper surface of the substrate 2. A base plate 4 is fixedly mounted at its upper surface on the lower surface of the substrate 2, thereby enclosing an operating fluid in each of the apertures 2A-2E. An electrically operated heater device 5 is provided on the upper surface of the base plate 4 for heating the fluids in the apertures 2A-2E, respectively, in such a manner that whenever the fluids are heated the resultant expansion of the respective operating fluid expands the diaphragms, respectively, toward the passage.

Abstract: A pump includes a pump chamber, a reciprocally, driven body that is moved to perform a pumping function by changing the capacity of the pump chamber, and a driving mechanism that reciprocally moves the driven body. The driving mechanism includes a rotating plate which is fixed to an output shaft of a motor and has an annular groove therein. A ball is sandwiched between an annular groove of a driving plate and the annular groove of the rotating plate. When the rotating plate begins rotating, the ball moves in the annular grooves and changes the inclined direction of the driving plate, thus, causing the driven body to reciprocate.

Abstract: An electromagnetic oscillating type pump for oscillating diaphragms connected to an oscillator through electromagnetic oscillation of the oscillator with magnetic body by utilizing magnetic interaction between an electromagnetic portion comprising one or a plurality of iron cores and the magnetic body. A frame portion of resin mold is formed by molding resin on an outer surface of the electromagnetic portion. It is possible to obtain electromagnetic oscillating type pumps capable of decreasing manufacturing costs and of exhibiting high acoustic insulating effects.

Abstract: A micromembrane pump comprises a pump membrane which is adapted to be moved to a first and a second position with the aid of a drive means and a pump body connected to the pump membrane so as to define a pump chamber between these two components, the pump body being defined by two semiconductor plates having each formed therein a valve seat and a valve flap which are formed integrally with the respective semiconductor plate, the two semiconductor plates being connected in such a way that a respective passive non-return valve is defined by a valve seat of one semiconductor plate and by a valve flap of the other semiconductor plate, one of the passive non-return valves being arranged in an inlet opening penetrating both semiconductor plates, whereas the other of the non-return valves is arranged in an outlet opening penetrating both semiconductor plates.

Abstract: A silencer assuming a shape of a sealed container in which an air reservoir is formed in a flow path from an suction inlet to an discharge outlet, wherein the air reservoir connected to the discharge outlet is provided with an exhaust valve mechanism for exhausting back-flowing air to the discharge outlet through external pressure. Since an exhaust valve mechanism for exhausting air which flows back to the discharge outlet owing to external pressure from, for instance, an air bag is provided, air can be rapidly exhausted from the air bag also in case actuation of the pump is terminated. Air pressure of the airbed can be promptly adjusted to perform adjustment of pressure of air bags or to prevent damages thereof.

Abstract: A vest for a human body has an air core coupled to a pulsator operable to subject the vest to pulses of air which repetitively applies and releases pressure to the body. The vest has a cover having a pocket accommodating the air core. The pulsator has diaphragms connected to a d.c. electric motor with a rotary to reciprocating motion transmitting mechanism operable to generate air pulses in the air core.

Abstract: An actively controlled flexural plate wave device provides a micro-scale pump. A method of actively controlling a flexural plate wave device produces traveling waves in the device by coordinating the interaction of a magnetic field with actively controlled currents. An actively-controlled flexural plate wave device can be placed in a fluid channel and adapted for use as a micro-scale fluid pump to cool or drive micro-scale systems, for example, micro-chips, micro-electrical-mechanical devices, micro-fluid circuits, or micro-scale chemical analysis devices.

Abstract: A magnetic actuator for reciprocating motion of a compressor diaphragm, piston or the like. The actuator comprises a stator with stator poles, excitation windings, and a backing plate. Non-magnetic support arms carry arced magnet poles and actuate a pair of compressed diaphragms. With the introduction of coil current, magnet poles are attracted to the central stator poles and repulsed by outer poles. A torque about pivot results and hence movement of arms with consequential actuation of the diaphragms. Performance is improved by increasing the flux produced by the electromagnet, thereby reducing flux leakage and fringing.

Abstract: An apparatus for cooling an electronic device includes a case where a plurality of air intake/exhaust holes through which air passes are formed. A plate type mobile member is installed to vibrate in the case and divides an inner space of the case into an upper space and a lower space. An elastic support film is fixed in the case to support the mobile member and has a bulged portion capable of being elastically deformed. A driving device is provided for vibrating the mobile member. By the vibration of the mobile member, air in the upper and lower spaces of the case is exchanged with outside air through the air intake/exhaust holes so that a heat source is cooled.

Abstract: A leak-proof compression pump, which includes a base frame, a pressure cylinder fastened to the base frame, the pressure cylinder having a fluid chamber, a fluid inlet, and a fluid outlet, and a fluid pumping mechanism mounted in between the base frame and the pressure cylinder, the fluid pumping mechanism including an actuating member fixedly connected between the pressure cylinder and the base frame, the actuating member having an integrated semispherical diaphragm reciprocated in and out of the fluid chamber to draw fluid into the fluid chamber through the fluid inlet and to force fluid out of the fluid chamber through the fluid outlet, a reciprocating rod driven to reciprocate the diaphragm of the actuating member, and a supporting cup connected between the actuating member and the reciprocating rod for enabling the diaphragm of the actuating member to be moved in and out of the fluid chamber in the pressure cylinder.

Abstract: A system for generating a high pressure fluid jet includes a variable pressure pump and a burst resistant delivery tube which safely conducts the pressurized stream to an instrument. The pump includes a disposable diaphragm pump cartridge which is driven by a reusable pump. The delivery tube may be a coiled hypo tube which enhances flexibility.

Abstract: A diaphragm pump, which is preferably electrostatically actuated, but which may be activated by other forces such as electromagnetic or piezoelectric actuation. The pump is formed by a pump body having a pump chamber formed therein. First and second diaphragms each having a set of valve holes in the diaphragm surface thereof are mounted in the chamber. Also provided are at least one inlet and at least one outlet port for communication with the pump chamber. The ports are positioned for sealing contact with the diaphragms at points that are not aligned with the holes in the diaphragms. A driver electrostatically actuates the diaphragms to cause diaphragm movement to a plurality of diaphragm positions to control flow of fluid through the pump. The first position is when the diaphragms are spaced from one another and from the ports to permit flow of fluid through the pump chamber.