Abstract: An apparatus and method of use thereof includes a rechargeable, pre-charged vacuum canister used to remove viscous fluids, e.g., waste oil, from containers such as engine crankcases through an opening, such as a dipstick tube. The self-contained canister is first pre-charged with a near absolute vacuum. Due to the compressibility characteristics of air, conventional, active, continuous pumping techniques, which rely on partial vacuums, do not achieve the pulling force of the near absolute vacuums achieved by the invention. The use of a self-contained, pre-charged near absolute vacuum canister system significantly increases the force applied to the viscous fluid to be extracted. Furthermore, the fluid can be simultaneously contained in a proper disposal container. As a result shortcomings of manual and electric pumping systems are overcome with the added advantage that no external pumping force is required at the site of fluid removal.

Abstract: A micropump including two glass sheets (2, 8) with a machined silicon board (6) sealingly inserted therebetween. An inlet valve (12), a pumping chamber (50) and an outlet valve (28) are arranged between an inlet (10) and an outlet (4). A pump diaphragm (56) forming one wall of the pumping chamber comprises a thickened central portion (58) interacting with the upper sheet (8) to form an abutment restricting the suction movement of the diaphragm (50), and lower abutment elements (60) restricting the movement of the diaphragm when the fluid is discharged. A piezoelectric pad (72) engages the diaphragm by means of an intermediate part (84) to perform the pumping movement between upper and lower limits precisely defined by the abutments. A precisely defined and constant flow rate is thus achieved regardless of changes in the performance of the piezoelectric pad.

Abstract: A peristaltic pump for pumping liquids through a resilient tube. The pump includes a platen against which a resilient tube is placed. A cam assembly is positioned adjacent to the platen and tube. A plurality of pump fingers are mounted between tube and cam assembly in a manner permitting movement of the pump fingers toward and away from the tube. As the cam assembly rotates, the fingers are pressed toward the tube sequentially so as to pump liquid through the tube. The pump finger ends should press the tube sufficiently to at least nearly occlude the tube and prevent back flow without over pressing and damaging the tube. A transverse pinch finger is provided in a cavity in the platen opposite each pump finger, with a tip on each finger spring biased to extend from the tube pressing face of the platen. At the tube occluding position, the pump finger nearly occludes the tube and the pinch finger completes occlusion without pressing the tube beyond the fully occluded position.

Abstract: The present invention relates to a bubble elimination method in a medical centrifugal pump wherein a blood outlet 18 is directed upward so that a vertical line X passing through the enter point O of centrifugal pump main body 12 is positioned between two straight lines .alpha.,.beta. which respectively pass through center point O and a point A and center point O and a point B, points A and B lying on the circumference of centrifugal chamber 15 where its periphery connects with blood outlet 18, and a blood inlet 17 is directed upward at an angle which is larger than the angle which is formed between the axis and the inner peripheral surface of centrifuge chamber 15, blood outlet 18 and blood inlet 17 being supported in these states by a drive portion 13 of the centrifugal pump main body 12. After filling the centrifuge chamber with blood and liquid filling, the processes of low speed drive, drive halt and high speed drive are sequentially carried out to rotating body 23.

Abstract: A hermetic type compressor which makes opening and closing of a exhaust valve installed inside a reentrant groove formed in a cylinder head smooth, and prevents leakage of refrigerant from the exhaust valve by fabricating a valve seat surface to be in the same height as that of a valve fixing surface.

Abstract: Pumping apparatus for dispensing or otherwise metering precise and minute volumes (measured in microliters) of fluid (e.g. human blood) from a flexible conduit containing such fluid. According to a preferred embodiment, such apparatus includes a pinch valve for selectively captivating a certain volume of fluid in the conduit between the pinch valve and the conduit's outlet end, and a pinch pump for selectively expelling a predetermined portion of the captivated fluid through the conduit's outlet end. The pinch pump is located and adapted to pinch closed a predetermined length of the conduit's fluid passageway. Preferably, such length is adjustable to adjust the volume of fluid dispensed or metered, and the pinch pump is structured to assure that, during activation of the pinch pump, the captivated fluid is advanced towards the outlet end of the conduit.

Abstract: An air chamber structure for a medical air compressor, the chamber being provided between the pump and an air bed. Two flow guiding stubs are provided at an air input end to scatter air and render it to revolve in a storage chamber with a smaller space, the air is led into a larger pressure stabilizing chamber through a flow guiding port during continuous pumping of air into the storage chamber, and hence the output of the air can be stable and at a constant flow rate. An air output pipe is located on one edge opposite to the storage chamber, and air is uniformly spread in the pressure stabilizing chamber, and is put out from the output pipe at a constant flow rate, thus avoiding the disadvantage of generating resonance and wind noise in the inflated bed.

Abstract: An integral valve diaphragm pump has a first rigid layer, a second rigid layer and a flexible membrane therebetween. Concave surfaces in the two rigid layers form a pump. The pump includes an actuating chamber which is alternately connected to a source of pressure and a source of vacuum. A pump chamber is connected to a fluid source and a fluid receiver through a filling check valve and a dispensing check valve, respectively. Duckbill and spring loaded ball check valves are disclosed.

Abstract: A thermally actuated vapor vent valve in a fuel pump module allows hot vapor to escape from the fuel pump module when the module is at a temperature significantly above normal operating temperatures. The vent valve is carried by a retainer in the fuel pump module and, at normal operating temperatures, the vent valve is closed on a valve seat of the vapor outlet to prevent vapor flow through the vapor outlet. The valve and the retainer are formed of materials having different coefficients of thermal expansion such that when the fuel pump module becomes heated to a temperature sufficiently above normal operating temperatures the retainer expands and disengages the valve from the valve seat. This allows the hot vapor within the fuel pump module to flow out of the module and thereby prevents the fuel pump from overheating or reaching temperatures which can damage the electric motor that drives the fuel pump.

Abstract: A fluid displacement apparatus comprises a valve plate member dividing a compressor housing into a first chamber and a discharge chamber. A passage is formed in the valve plate member to allow communication between the first chamber and the discharge chamber. An elastic valve member disposed on the valve plate bends to open and close the end of the passage. The valve retainer member is secured to the valve plate together with the elastic valve member and has a curved end portion. A valve seat includes a recessed portion offset from an end surface of the valve plate. The recessed portion includes an inclined portion and a wall portion extending therefrom. The distance between the beginning of the curved portion of the valve retainer member and the securing means is greater than the distance between an edge of the recessed portion of the valve seat and the securing means.

Abstract: An apparatus for driving levitation coils of a magnetic bearing provided with a DC power source and a motor drive device powered by the power source. A DC motor is driven by the motor drive and the output from the motor is linked to a switching amplifier. The output from the amplifier is linked to the levitation coils of the magnetic bearing. A feedback control is provided from the magnetic bearing to the amplifier to position a rotor associated with the levitation coils in response to the amplifier output. The DC power source also directly powers the switching amplifier.

Abstract: A reciprocating pump, comprising a reciprocating motor having a housing body which includes an open first end and a base at the first end, the base substantially closes the first end of the motor housing. The motor also includes a reciprocating member movable by the motor. The member has an end and is adapted to be movable through a housing body chamber. The reciprocating pump includes a pump outlet having a first end, a second end, a pumped fluid outlet port between the ends, and a passageway joining said ends and adapted to receive the end of the reciprocating member. The passageway has a minimum width and the outlet body is connected to the pump base. The reciprocating pump also includes a pump member adapted to be flow connected to the second end of the outlet body.

Abstract: A screw compressor has a male rotor and female rotor rotatably engaging each other in a casing. The male rotor has a radius R and Z-number of helical convex teeth, each of which is chamfered on a leading edge of an end facing the discharge end of casing to allow lubricating liquid to escape from a space between rotor teeth during discharge stages of operation. This prevents drastic increases in pressure upon the bearings due to a liquid compression phenomenon. Thrust forces produced by the liquid against a flat chamfer surface prevent scoring of the edges of the rotors and thus permit designs with narrow gaps between the rotors and the casing to improve the efficiency of the compressor.

Abstract: The present invention relates to a liquid-ring pump which effectively dampens noise by providing a blocking element arranged in its compression space in the flow path between the mouth of its output port and the outlet opening of its discharge connection. The blocking element covers this outlet opening and has a flow-through opening. The cross-section of the flow-through opening automatically adapts to the quantity of medium delivered by the pump at any given time.

Abstract: A compressor assembly is disclosed including a compressor mechanism mounted within a hermetically sealed housing. A cylinder block contains a reciprocating piston in which the piston includes a suction valve assembly and an annular rim that substantially completely fills the discharge port when the piston is at top dead center position, to reduce re-expansion volume. The cylinder head assembly is attached directly to the cylinder block with no intermediate gasket therebetween, permitting coplanar seating of the discharge valve with a correspondingly larger discharge valve seat perimeter permitting faster valve closure and lower pressure loss through the discharge port.

Abstract: A fluid pressure feeding apparatus for feeding cold water for cooling a mining pit into the pit and pumping water and muddy water heated within the mining pit onto the ground. A controller for switching a number of the operative chambers is provided to thereby perform a continuous operation.

Abstract: A device to separate muddy water from slurry which is being drained away and a means to use said muddy water to both seal and lubricate a gap between the guide channels and the vanes of the drainage pump, thereby securing the efficient long-term functioning of the pump. The invention presupposes the use of a vane type rotary drainage pump connected to a separation means which is set up to remove muddy water from the slurry discharged from the discharge port. A pressure chamber is incorporated into said rotor and connection with the inner ends of each of said guide channels. The muddy water separated out by the separation means is fed back into said pressure chamber.

Abstract: The invention provides a fuel injection pump for internal combustion engines having a high-pressure chamber, which is intermittently brought to high fuel pressure, and which communicates via a pressure line with an injection point of an engine, and having a pressure valve, inserted into the pressure line. This pressure valve comprises a valve body and a valve seat onto which a valve member is pressed by the force of a valve spring. The valve spring is located in a recess of a pressure valve holder, which communicates with the injection line via an axial conduit. A transitional region leading from the diameter of the axial recess to the diameter of the conduit is embodied with a cone shape or a truncated cone shape.

Abstract: An apparatus for efficiently applying a subject liquid on an object of interest is disclosed. The apparatus includes a metering device (30), a discharge tube (280) and a nozzle (290). The metering device (30) includes a cylinder (115) and a piston (165) which is operatively disposed within the cylinder to define a metering chamber (177) ahead of the piston. The metering device (30) includes a liquid inlet (108) and a liquid outlet (109). Fluid flow to the liquid outlet (109) is controlled by a check valve (130). The piston (165) is driven forwardly through a working stroke to force the liquid in the metering chamber (177), out of the metering chamber, and past the check valve (130). The piston (165) breaks the plane of the open end of the cylinder on each working stroke to preclude entrapment of air in the metering chamber (177), and thus provide for a more accurate metering. The nozzle (290) includes a fluid passageway (301) which is disposed in fluid flowing relation relative to the metering device (30).

Abstract: An impeller-type pump system includes a housing defining a pump chamber and a fluid inlet communicating with the chamber. An impeller is rotatably mounted in the pump chamber downstream of the inlet. The impeller includes a rear magnet hub mounting an axially facing driven magnetic coupling. Bearings are provided about the outside of the impeller for rotatably mounting the impeller in the pump chamber. Ceramic barrier discs are located behind the impeller to define a closure sealing the rear of the pump chamber. Ball bearings are mounted in a cup-shaped recess in the rear face of the magnet hub and bearing against the ceramic barrier discs at least during start-up of the pump. The sidewalls of the recess diverge away from the ceramic barrier discs, whereby the ball bearings move away from the ceramic barrier discs under centrifugal force in response to rotation of the impeller.