Abstract: A dry-pit submersible pump using a totally enclosed fan-cooled (TEFC) electric motor to power the pump. A release mechanism prevents the fan from creating excessive drag when submerged in water. The fan cools the motor when the water level is below the motor, and the surrounding water combines with the fan to cool the motor when the water level rises to at least partially surround the motor. When the fan is at least partially submerged, the release mechanism substantially prevents the fan from imposing a load on the motor due to the surrounding water. The release mechanism can take the form of a shear key, a torque-release clutch or flexible fan blades.

Abstract: A linear compressor having improved heat-radiating performance incorporates first and second cylinders disposed coaxially, a first piston reciprocatably disposed inside the first cylinder, a second piston reciprocatably disposed inside the second cylinder, a compression chamber formed by the front face of the first piston and the front face of the second piston and a connecting wall connecting the first and second cylinders, and multiple working gas passages having openings formed in the connecting wall and connecting the compression chamber to the outside via these openings. The working gas passages are formed on a plane perpendicular to the axial direction of the first and second cylinder. Heat-radiating means are provided around the working gas passages. The first cylinder and the second cylinder are made of aluminum (or an aluminum alloy).

Abstract: The present invention provides an air compressor which includes an air drier filled with a drying agent and having a first passage for supplying compressed air to one air supplied part while absorbing moisture from the compressed air by passing the compressed air through the drying agent (27) and a second passage (28a) for supplying the compressed air to another air supplied part without passing the compressed air through the drying agent. The air supplied through the first passage returns through the same passage to dry the drying agent.

Abstract: Cooling means for cooling an electric motor mounted on or adjacent a volute of a centrifugal fan, the cooling means including an opening through the wall of the volute, and a shroud connected to the volute, the shroud including a volute end and a motor end, wherein the volute end of the shroud substantially covers the opening, and the motor end of the shroud extends around at least a portion of the periphery of the electric motor, such that the shroud provides a passage for flow of air from the volute and directs the flow of air around at least a portion of the periphery of the motor.

Abstract: A radial piston hydrostatic machine having a first fluid displacement stage and a second fluid displacement stage, the machine having an outer housing structure for defining an internal chamber, a drive-shaft supported in the housing and operatively connected to a cylinder-barrel located within the internal chamber, the cylinder-barrel having a number of radial cylinders and each cylinder containing a piston operatively connected to a surrounding annular track-ring, the cylinder-barrel and pistons defining a rotating-group and where the rotating-group is positioned in a sub-chamber generally defined axially by the width of the track-ring and radially by the radial distance between the cylinder-barrel and surrounding track-ring.

Abstract: A method of orientating an apparatus for housing fans includes the step of providing a mounting body portion and first, second and third fan housings. The mounting body portion has a length, and includes first and second longitudinal sides. The fan housings are operably attached to the mounting body portion. The fan housings also have a length. The sum of the lengths of the fan housings are greater than the length of the mounting body portion. The fan housings include a cable trough. The method also includes the step of orienting each of the cable troughs towards a region of the mounting body portion bounded by each of the fan housings.

Abstract: A gas ballast system for a multi-stage positive displacement pump in which a first stage includes at least one positive displacement pump stage, is equipped with an inlet valve and an outlet valve, and is connected with the following stage by an intermediate vacuum chamber, with the gas ballast system including a first conduit for supplying gas into the intermediate vacuum chamber, and a second conduit for supplying gas from the intermediate vacuum chamber into a pump chamber of the first stage or to a suction region of the first stage.

Abstract: A rotary pump includes a housing having an inner surface that confines a rotor chamber. Two parallel shafts are mounted pivotally on the housing and extend axially through the rotor chamber. Two meshing multi-lobe rotors are mounted on the shafts within the rotor chamber, respectively. Each of the rotors has a plurality of lobes projecting radially therefrom toward the inner surface without contacting the inner surface.

Abstract: A bubble valve that comprises a liquid delivery channel and a localized heating arrangement. The liquid delivery channel includes an upstream portion and a constriction downstream of the upstream portion. The constriction has a smaller cross-sectional area than the upstream portion. The localized heating arrangement is located in the liquid delivery channel and generates heat to nucleate and enlarge a bubble in the liquid. The constriction is shaped to form a seal with the bubble. The localized heating arrangement additionally generates heat to move the bubble relative to the constriction to control the flow of the liquid. A pressure regulator that comprises a liquid delivery channel connected to a liquid outlet, a sensor located adjacent the liquid outlet, a controller that operates in response to the sensor and a localized heating arrangement. The liquid delivery channel includes an upstream portion, and a constriction located between the upstream portion and the liquid outlet.

Abstract: A pressure compensator for a sub-sea pumping system for pumping an effluent from a deep-sea wellhead comprising a topside module, a sub-sea module, and an umbilical connection between the topside and sub-sea modules. Hydraulic fluid is circulated through the sub-sea module for cooling and lubricating the motor and the pump. The hydraulic cooling and lubricating fluid is preferably a single hydraulic fluid that is compatible with the effluent being pumped. The hydraulic fluid is circulated through a submerged pressure compensator which may include a bellows assembly. The pressure compensator is responsive to the pressure of the effluent being pumped and pressurizes the hydraulic cooling and lubricating fluid to a pressure above the pressure of the effluent. The pressure compensator also responds when the volume of hydraulic cooling and lubricating fluid in the system is reduced or increased, such as by leakage or thermal expansion, in order to maintain the pressure of the hydraulic fluid.

Abstract: A pump for impelling a fluid includes a first variable volume, the first variable volume having a first inlet for allowing the influx of the fluid into the first variable volume and a first outlet for allowing the efflux of the fluid out of the first variable volume and a first membrane defining at least a portion of the first variable volume. The pump also includes a first contractile actuator, for displacing the first membrane from a first position to a second position in such a manner as to vary the first variable volume and a second contractile actuator, for restoring the first membrane from the second position to the first position in such a manner as to vary the first variable volume. A first check valve is coupled to the first inlet for regulating the influx of fluid into the first variable volume through the first inlet and a second check valve is coupled to the first outlet for regulating the efflux of the fluid out of the first variable volume through the first outlet.

Abstract: A combination telescopic boat hook/bilge pump which includes a novel locking device is described. The inner tube is provided with a washer at the proximal end which acts with the outer tube as a piston. The ball tip distal end of the boat hook is provided with an axial bore so that water can be sucked into the outer tube for subsequent discharge. For use as a boat hook the inner tube is extended until a pair of spring loaded pins mounted in the inner tube at the proximal end thereof releasably engage any two of three circumferential slots provided adjacent the proximal end of the outer tube so as to provide an extended rigid shaft.

Abstract: A fluid pump includes a housing having a passage therethrough with an inlet and an outlet. An impeller is positioned within the housing and includes an impeller axis, an inlet side and an outlet side. The impeller is axially supported only at the outlet side, and is configured to direct fluid at an acute angle relative to the impeller axis. A switched reluctance motor is secured to the housing for rotating the impeller for pumping fluid from the inlet to the outlet.

Abstract: A cassette for use with a pump control module includes a top surface configured for receipt of a tube and an access door. A method for using a pump control module includes mounting a cassette having a top surface comprising an access door to the pump control module; opening the access door; installing the tube into the cassette; closing the access door; and effecting pumping. A infusion pump comprising a pump control module and a cassette configured for receiving a tube, the cassette comprising an access door and a frame.

Abstract: An installation for the production of pressure has three operating states corresponding to a delivery operation, an idle operation, and a partial delivery operation. The installation contains at least two compression chambers in at least one compressor, each chamber being assigned at least one switchable inlet valve. In the delivery operation, the switchable inlet valves act as check-valves that allow pressure medium to flow into their respective compression chambers. Each compression chamber also contains at least one outlet check valve through which compressed pressure medium flows out to a pressure consuming system in the delivery operation. Each switchable inlet valve also has an idling position that allows pressure medium to flow into the applicable compression chamber and back out again without being substantially compressed. In the idle operation of the installation, each switchable inlet valve switches to its idling position.

Abstract: A cryogenic vacuum pump system in which a pump out system such as a cryotrap 13, with which gas is subjected to vacuum pump out by condensing or adsorbing said gas on a cryopanel which has been cooled to a very low temperature, is used, and a radiant heat absorbing baffle 18 which has been subjected to a blackening surface treatment is established up stream of, or around, the cryopanel 15. The radiant heat which is absorbed by the radiant heat absorbing baffle is released outside the chamber. The total thermal load on such a cryotrap is greatly reduced.

Abstract: A booster water pump for increasing source water pressure to a high water pressure for industrial use, has an elongated tubular hollow cylinder having both ends closed with a cylinder inlet port in one end, and a cylinder outlet port to permit the cylinder to be filled with source water. The pump has a submersible motor and hydroturbine pumping unit so articulated that turbine impellers are adjacent the motor and a turbine outlet is away from the motor, the motor-pump unit fitting in the tubular cylinder. The water passageway is annular and the turbine outlet is attached inside the cylinder to the cylinder outlet port. The pump is highly portable and effective to provide high pressure water to remote locations from low pressure sources.

Abstract: An electric waving fan includes a single air moving fan vane element, a motor for generating power, a transmission apparatus for converting the power to motion, and a power output assembly for moving the single fan vane element simultaneously in two directions such that the fan vane element moves with a waving motion. The fan further includes a base and a wrist assembly that can be moved in two directions relative to the base which can be mounted on a wall, on the floor or desk, or hang from the ceiling.

Abstract: A bicycle tire pump includes a cylinder having two passages defined therethrough which are separated by a board, two openings respectively defined in a top of the cylinder and communicating with the two passages into which two pistons are respectively and movably received. A head is mounted to the top of the cylinder and has two ways defined therein which respectively communicate with the two passages in the cylinder and an outlet of the head. A bolt extends through one of the two passages and is threadedly connected to the head. The bolt has a longitudinal passage defined therethrough which communicates with one of the two ways.

Abstract: A levitation hand-holdable blower comprises a pistol like housing that has a butt 10 and a barrel 11. A motor 12 and a fan provide a flow of air along a channel and out of vents 17 to support a ball (not shown) in levitation manner. The blower is easily transportable and simple to operate.