Abstract: A fluid pump includes a pump housing having a housing cavity with an inlet and an outlet. An encapsulated stator assembly is positioned within the housing cavity and at least partially defines a fluid passage from the inlet to the outlet. A polymeric capsule member encloses and seals the encapsulated stator assembly, protecting the motor from, and providing heat transfer to, the working fluid. A stator provides a magnetic field which drives a rotor assembly. The rotor assembly rotates an impeller for pumping fluid from the inlet to the outlet.

Abstract: The present invention provides cavitation detection systems and methods employing a classifier for detecting, diagnosing and/or classifying cavitation in a pumping system. The classifier can be integral to tie cavitation detection system and/or operatively coupled to the cavitation system via a controller, diagnostic device and/or computer. Parameters such as flow, pressure and motor speed arc measured and/or estimated, and then provided to a classifier system Such systems include Bayesian, Fuzzy Set, nonlinear regression, neural networks and other training systems, for example The classifier system provides a signal indicative of the existence and extent of cavitation. An exemplary classification system is presented that delineates cavitation extent into one or more of the following categories: 0 (no cavitation), 1 (incipient cavitation), 2 (medium cavitation), 3 (fill cavitation) and 4 (surging cavitation).

Abstract: A gas compressor and method according to which a plurality of inlet valve assemblies are angularly spaced around a bore. A piston reciprocates in the bore to draw the fluid from the valve assemblies during movement of the piston unit in one direction and compress the fluid during movement of the piston unit in the other direction and the valve assemblies prevent fluid flow from the bore to the valve assemblies during the movement of the piston in the other direction. A discharge valve is associated with the piston to permit the discharge of the compressed fluid from the bore.

Abstract: A device for cooling and lubricating a subsea device (1) which includes an electric rotary machine (4) and a fluid-rotation machine (6-8) drive-connected (5) thereto, which electric rotary machine (4) has a lubrication/cooling circuit includes a cooler (11) exposed towards the surrounding seawater, and where the fluid-rotation machine (6-8) has a fluid pressure at the end facing towards the electric rotary machine (4). The lubrication/cooling circuit (12, 11, 14) is pressure-impacted by the fluid pressure at one point (19, 20) in the lubrication/cooling circuit outside the fluid-rotation machine (6-8).

Abstract: A screw compressor 1 comprises a screw compressor body 2 having a pair of female and male screw rotors 21 meshed with each other encased in a rotor casing 22, and a motor casing 4 having a motor 3 for driving a male rotor 21b of the screw rotor 21 encased therein. The screw compressor body 2 and the motor casing 4 are connected integrally. The male rotor 21b and the motor 3 are connected by a common rotor shaft 23. In the common rotor shaft 23, the counter motor 3 side is supported by a rolling bearing and a projecting end of the motor 3 is supported by a rolling bearing 7 on the motor side, and a portion between the motor 3 and the screw rotor 21 is supported by an intermediate rolling bearing 6.

Abstract: The invention relates to a piston pump for a hydraulic, slip-controlled vehicle brake system. The piston pump has a piston, which is inserted with a part of its length into a sleeve. A tubular filter that encompasses the piston is attached to the sleeve and constitutes a captive retainer, which secures the piston in a captive fashion in the sleeve. In order to reduce an axial mobility of a sealing ring that seals the piston in the pump housing, the invention proposes attaching the filter, which limits the axial mobility of the sealing ring, to the sleeve in an axially mobile fashion.

Abstract: A blower assembly includes a rotor assembly having a shaft and a stator assembly coupled to the rotor assembly. A shrouded fan assembly is coupled to the shaft so as to generate an air flow when the shaft rotates. A unitary diffuser having a fan side opposite a motor side, is included wherein the fan side is coupled to the shrouded fan assembly. The unitary diffuser has ports for transferring the air flow from said fan side to said motor side. The motor side has a stator wall that partially encloses the stator assembly and the rotor assembly. An end cap is coupled to the stator wall for further enclosing the stator assembly and the rotor assembly. The assembly also includes a plurality of termination boxes disposed about the periphery of the stator wall for terminating the wire windings of the stator assembly. The end cap has at least one tab, and the stator wall has at least one tab receptacle that slidably receives the tab.

Abstract: A main unit pumps the transferred liquid actuated by an auxiliary unit for pumping a working liquid. The auxiliary unit comprises a piston provided with an axial drilling (bore) for circulating working liquid between a tank and a compression chamber. The piston further comprises a valve for closing the drilling, the valve housed in the drilling between two ends thereof in permanent communication with the tank and the compression chamber respectively. The valve opens when the pressure of the working liquid in the tank exceeds that of the working liquid in the compression chamber and closes in the opposite situation. The compression chamber is delimited by a flexible diaphragm for pumping transferred liquid. The diaphragm is constantly elastically returned to the first position by a diaphragm spring.

Abstract: An engine idle controller for an engine driven pressure washer. The pressure washer delivers high pressure water from a pump through the idle controller to a conventional wand which includes a manually operated, normally closed flow control valve and a spray nozzle. When the wand valve is opened, a resulting pressure drop between two chambers in the flow controller acts on a piston to move the engine throttle to a full throttle position. When the wand valve is closed, the pressures in the chambers equalize and the piston is moved to a position to set the engine throttle to an idle position.

Abstract: A reciprocating compressor includes a linear motor having a piston reciprocating inside a cylinder. A cylinder head is provided with suction and discharge orifices. A valve means is mounted inside the cylinder and has an operative position, seated against the discharge orifice. The operative position is defined when the top of the piston is within a certain distance from the cylinder head. The distance is defined, so that, at the end of the compression stroke of the piston, a determined pressure is reached inside the cylinder, and the pressure results in a force on the piston. The force is opposite to a force which is impelling the piston and which is sufficient to interrupt its compression stroke before impacting the cylinder head.

Abstract: A restarting device of a pump including a center rod defining fluid delivering chambers and driving chambers 11b and 12b. The restarting device of the pump further includes: a change-over valve 2 for switching a direction for the center rod to move, and a restarting hydraulic circuit 3 which, when a supply of the driving fluid from the change-over valve 2 to the driving chambers 11b and 12b in both sides is stopped, detects the supply of the driving fluid into the driving chambers 11b and 12b in both sides having been stopped and then causes the driving fluid to flow into the change-over valve, thereby restarting the supply of the driving fluid into the driving chambers 11b and 12b.

Abstract: A pneumatically operated oil pump comprises an outer tube for extending into an oil tank and a sucking tube moveably arranged within the outer tube. The sucking tube includes one-way valve establishing an airtight arrangement with respect to an inner wall of the outer tube. An air operated device is arranged on top of the outer tube and interconnected to the sucking tube located within the outer tube. The device includes an upper operating chamber and a lower operating chamber intercommunicated with an air pipe. The device further includes a movement reciprocally moved within the device when compressed air is introduced into the device so as to move the sucking tube reciprocally.

Abstract: In a compressor, a yoke constituting a linear drive section together with a driver coil, through which magnetic fluxes from a permanent magnet pass, is integrated with a cylinder and a container. A piston inserted into the cylinder is supported by springs, and the other end thereof faces an operating-gas-compressing space. The linear drive section is arranged parallel to the piston in a diametrical direction thereof. This construction reduces the longitudinal dimension of a piston portion. Further, a plurality of parts is combined together in a main body block, thereby reducing the number of parts required and improving the assembly accuracy.

Abstract: A pump includes an impeller, a stator, and a plurality of permanent magnets forming bearing poles coupled to a selected one of the stator or the impeller. The pump further includes a plurality of shorted coils coupled to the other of the stator and the impeller. The plurality of bearing poles and shorted coils co-operate to form an electrodynamic bearing during rotation of the impeller. The electrodynamic bearing supports the impeller either axially or radially during operation of the pump. Currents induced into each coil by a single bearing pole or by a plurality of bearing poles substantially simultaneously produce an electrodynamically generated magnetic field that repels the inducing bearing pole(s) when the impeller is rotating.

Abstract: A gas compression system including a body of fluid and a down pipe. A first end of the down pipe is positioned to receive a fluid from a source above a surface of the body of fluid and a second end is positioned at a lower level of the body of fluid. A gas inlet is coupled to the down pipe, above the surface of the body of fluid for mixing a gas to be compressed with the fluid from the source to form a mixture. A chamber is positioned at the lower level of the body of fluid and coupled to the second end of the down pipe for receiving the mixture and collecting a compressed gas therefrom. A conduit is coupled to the chamber for transferring the compressed gas therefrom.

Abstract: An object of the present invention is to provide a suction-discharge device for fluids capable of sucking fluids continuously and discharging fluids continuously under fixed flow rate and pressure, without substantially bringing about pulsations of even one unit.

Abstract: A pneumatic pump control system for sequentially switching on and off an electrically operated pump disposed in a waste water liquid storage tank The pneumatic pump control system comprises a pneumatic pressure accumulator that is disposed within the liquid storage tank at a predetermined level. The pneumatic pressure accumulator is a dome-type that defines an interior air chamber for containing air, and a lower opening disposed at an elevation that represents a zero reference level within the tank. The lower opening is in communication with the liquids in the liquid storage tank when the level of liquid is as high as the lower opening. A pressure transducer is operatively connected to the pneumatic pressure accumulator for communication with the interior air chamber to measure the differential air pressure between the air within the interior air chamber and the upper layer of air within the liquid storage tank.

Abstract: An apparatus and method for producing predetermined quantities of a meat product, inc which the apparatus comprises a twin vane concentric pump with an inlet and an outlet circumferentially spaced from one another, and a pair of independently movable vanes. During operation, one of the vanes is positioned between the inlet and outlet to permit pressurization of meat chunks in a chamber communicating with an outlet opening. The other vane is advanced toward the outlet with the outlet valve closed until a predetermined pressure is reached, at which point the outlet valve is opened to dispense a predetermined quantity of meat product. Similar to single vane meat pumps, the disclosed twin vane pump is capable of handling large meat chunks while causing relatively little damage to the chunks.

Abstract: There is provided a system for supplying a fixed amount of fluid in which the reverse flow of the fluid is eliminated and a precise fixed amount of the fluid can be delivered. In a system for supplying a fixed amount of fluid comprising a fluid accommodating unit comprising a fluid accommodating bag and a pump connected to the fluid accommodating bag and a fluid supplying device body in which the fluid accommodating unit is detachably disposed and a pump driving mechanism for driving the pump is disposed, the pump of the fluid accommodating unit is a bellows pump having two check valves; the check valve comprises a valve base having through-holes formed therein and whose downstream surface is curved to be convex toward the downstream and a valve body made from an elastic thin plate for covering the downstream surface of the valve base and having a hole at the center thereof; and the pump driving mechanism drives a bellows so as to expand and contract it at a predetermined stroke.

Abstract: Since many valves are used, pressure loss is large, resulting in low reliability of a pump. Even when the period of increasing and decreasing the volume of a pump chamber is long, and a piezoelectric element is used as an actuator that drives a diaphragm, a driving operation cannot be performed at a high frequency, or a proper flow rate cannot be realized under a high load pressure. In accordance with the invention, the combined inertance value of an entrance passage used to make working fluid flow into a pump chamber is smaller than the combined inertance value of an exit passage used to make the working fluid flow out from the pump chamber. A fluid resistance member is provided at the entrance passage in which fluid resistance when the working fluid flows into the pump chamber is smaller than fluid resistance when the working fluid flows out of the pump chamber.