Abstract: A rotary machine cooling system is provided that includes a housing having an inlet and outlet. A rotor supported in the housing for rotation about an axis with the rotor including an outer surface. A stator is disposed within the housing about the rotor having an inner surface adjacent to the outer surface of the rotor. A gap is formed between the inner and outer surfaces sufficient to reduce friction and permit convection cooling. The gap is in fluid communication with the inlet and outlet, and a pumping device pumps a cooling gas from the inlet into the gap and through said outlet. The pumping device includes an impeller affixed to an end portion of the rotor to create an axial airflow into the gap. Preferably, the present invention air cooling system is used in conjunction with a liquid cooling system arranged exteriorly to the stator. The liquid cooling system reduces the amount of air needed to flow between the gap to remove the desired amount of heat from the machine.

Abstract: A linear compressor including a casing, a driving unit provided within the casing, a compressing unit driven by the driving unit, compressing refrigerant, and a supporting spring elastically supporting the compressing unit, a projection projecting from on one of the compressing unit and a ceiling part of the casing, and a stopper provided in a remaining one thereof, movably accommodating the projection within a predetermined movable range. With this configuration, the linear compressor is capable of preventing a collision between a compressing unit and an inner face of a casing.

Abstract: To provide a horizontal type electric compressor in which there is no fear of lubricant staying at the bottom of a casing even when a flow velocity of a refrigerant is reduced, whereby no shortage of lubricant is incurred in a compressor section. As seen from the suction chamber side, there are formed, as introduce passages, grooves extending from suction openings of the front side block of the compressor section to the peripheral surface in the lowermost portion of the front side block. Then, the introduce passages and the suction openings are covered with a partition wall for fixation of the front side block. An opening hole is provided in the lower portion of the partition wall to establish communication between the introduce passages and the suction chamber. Since the opening hole is situated at the bottom portion of the suction chamber, any lubricant threatening to gather at the bottom portion of the suction chamber due to a reduction in the flow velocity of the sucked refrigerant, etc.

Abstract: A hermetic refrigerant compressor including a compressor mechanism and a motor including a stator surrounded by a rotor attached to a crankshaft drivingly linked to the compressor mechanism. A first gap is formed between the rotor and stator, and a second gap is formed between the stator and the compressor mechanism. During compressor operation discharge gas expelled from the gas compression chamber travels through a discharge passage and a discharge plenum, and then through the first and second gaps. The rotor spinning during compressor operation causing a spinning vortex of refrigerant gas to occur in the discharge plenum, the vortex having an outer flow path of warmer gas and an inner flow path of cooler gas. The outer flow path of warmer gas generally travels through the second gap and the inner flow path of cooler gas generally travels through the first gap for enhanced motor cooling.

Abstract: Scroll compressors may include a stationary scroll, a drive shaft, a crank shaft coupled to the drive shaft, a bearing member coupled to the crank shaft and a movable scroll coupled to the crank shaft. The movable scroll is typically disposed adjacent to the stationary scroll. Further, the movable scroll preferably includes a boss that extends in the axial direction of the crank shaft. A spacer may be disposed between the boss and the bearing member and the spacer preferably transmits orbital movement of the crank shaft to the movable scroll. A compression chamber is defined by a space between the stationary scroll and the movable scroll. Fluid (e.g. a refrigerant gas) is compressed within the compression chamber when the movable scroll revolves or orbits with respect to the stationary scroll. A discharge port may be defined within the movable scroll and may be adapted to discharge the compressed fluid to a side that is opposite of the stationary scroll.

Abstract: Scroll compressors may preferably include, for example, a stationary scroll, a drive shaft member, a movable scroll, a bearing member, a compression chamber, a discharge port, a discharge valve and a discharge valve clamping device. The drive shaft member may revolve around a revolution axis. The bearing member may be disposed between the movable scroll and the drive shaft member in order to transmit the revolution of the drive shaft member to the movable scroll. The compression chamber may be defined by a space formed between the stationary scroll and the movable scroll. The compression chamber compresses the fluid drawn into the compression chamber when the movable scroll revolves or orbits with respect to the stationary scroll. The discharge port is disposed within the movable scroll and is adapted to discharge fluid within the compression chamber to the opposite side of the stationary scroll. The discharge valve clamping device is preferably affixed to the movable scroll.

Abstract: An electric compressor includes a compression mechanism, an electric motor and a housing. The compression mechanism draws, compresses and discharges refrigerant gas. The electric motor drives the compression mechanism. The housing accommodates the compression mechanism and the electric motor. A heat sink extends from the housing. An inverter is located in the housing. The inverter powers the electric motor. A heat sink cools the inverter. The heat sink is cooled by refrigerant gas. The heat generated by the inverter is therefore effectively reduced.

Abstract: Scroll compressors may preferably include a stationary scroll, a drive shaft, a crank shaft coupled to the drive shaft and a bush coupled to the outer surface of the crank shaft. A seal is preferably disposed between the bush and the crank shaft and the seal is elastically deformable in the radial direction of the crank shaft. A movable scroll may be coupled to the crank shaft and disposed adjacent to the stationary scroll. A compression chamber is defined by a space between the stationary scroll and the movable scroll, such that fluid is compressed within the compression chamber when the movable scroll revolves or orbits with respect to the stationary scroll. Further, a discharge port is preferably defined within the movable scroll and adapted to release the compressed fluid to a side that is opposite of the stationary scroll.

Abstract: A fluid pump, in particular for the coolant and heating system of a motor vehicle, has a stator (21) of claw pole construction and a rotor (6), separated from the stator (21) by a pipe (11), which is immersed in the coolant and forms a vane wheel. The rotor (6) is disposed radially inside the stator (21).

Abstract: An electric blower includes a motor unit having a stator and a rotor, a fan unit having an impeller attached to an output shaft of the rotor, and a circuit unit having a heat-generating component for controlling electric power to the motor unit. The circuit unit is arranged in an airflow path of air expelled from an outer periphery of the impeller toward the stator and the rotor of the motor unit. The air suctioned by rotation of the impeller cools the heat-generating component in the circuit unit before cooling the stator and the rotor.

Abstract: A turbocompressor (1) has an electric motor (2), a multistage radial turbocompressor (3) and a common shaft (13). A section of the shaft (13) is formed as the armature (2b) of the electric motor (2) and a further section of the shaft (13) is formed as the rotor (3e) of the radial turbocompressor (3), with the rotor (3e) including a compressor shaft and compressor wheels (3b) connected thereto. A plurality of electromagnetic radial bearings (5) are arranged spaced apart in the direction of the shaft (13) for the journalling of the shaft (13), and a single electromagnetic radial bearing (5) is arranged between the armature (2b) of the electric motor and the compressor wheel (36). The electric motor (2), the radial turbocompressor (3), the shaft (13) and the radial bearings (5) are inside a common housing sealed gas-tight to the outside. The housing (6) consists of a plurality of part housings (6e, 6f, 6g) which are connected together.

Abstract: Scroll compressor may include, for example, a stationary scroll, a drive shaft, a crank shaft coupled to the drive shaft, a bush coupled to the outer surface of the crank shaft and a movable scroll coupled to the crank shaft. The movable scroll is preferably disposed adjacent to the stantionary scroll. A boss may be coupled to the movable scroll and the boss preferably protrudes from the movable scroll at the opposite side of the stationary scroll. A seal is preferably disposed in a clerance defined between the bush and the boss. A compression chamber is defined by a space between the stationary scroll and the movable scroll. Fluid is compressed within the compression chamber when the movable scroll revolves or orbits with respect to the stationary scroll. A discharge port is preferably defined within the movable scroll and is adapted to discharge compressed fluid to a side that is opposite of the stationary scroll.

Abstract: A water-cooled pump motor for delivering potable water in a demand system includes a centrifugal pump including a volute and an impeller in the volute, an electric motor driving the impeller having a hollow rotor shaft, a rotor on the shaft, bearings supporting the rotor shaft, a stator coaxially outward of the rotor, two water impervious liners, one located within the stator and the other coaxially outside the rotor, the liners being spaced to define a cylindrical passageway across the rotor and a cooling and lubricating water passageway for water to flow through the motor including flow from the impeller between the rotor shaft and the bearings, across the cylindrical passageway and through the hollow rotor shaft back into the volute.

Abstract: An improved fluid detection mechanism for a canned motor pump includes a return passage which receives a fluid detector. The fluid detector is a bubble detector which can sense the presence of bubbles, or the lack of a fluid. The detector is preferably positioned in a return path for returning a cooling and lubricating pump fluid back to the pump chambers from the canned motor chamber. This location will likely be the hottest location and the lowest pressure location in the pump. This location provides a very good indication of when the motor is overheated. Also, the location provides a very good indication to identify the lack of adequate lubricating and cooling fluid being directed to the bearings. As such, the location provides benefits over the prior art.

Abstract: A turbocompressor (1) has an outwardly gas-tight housing (6) within which an electric motor (2) and a multistage radial turbocompressor (3) are arranged on a common shaft (13). For journalling the shaft (13), electromagnetic radial bearings (5) are arranged spaced apart in the direction of the shaft. A gas seal (19) surrounding the shaft (13) is arranged between the electric motor (2) and the radial turbocompressor (3) in order to seal off the electric motor (2) with respect to the radial turbocompressor (3). The electric motor (2) has an inner space (9b, 9c) which is connected in a fluid-conducting manner to an outlet opening (6h; 21) which passes through the housing.

Abstract: An electric pump for a liquid has a rotor surrounded by a stator which is disposed in the flow path of the liquid, the rotor being disposed in a rotor compartment, which is sealed from the flow path of the liquid and is predominantly filled with a mixture of air and vaporized liquid. The rotor compartment is in communication with the ambient atmosphere through a vent orifice. A vent system in the form of a labyrinth seal and a liquid-tight, gas-permeable membrane is interposed between the vent orifice and the ambient atmosphere. The rotor bearings are lubricated in one embodiment by leakage liquid and its vaporized product within the rotor compartment. In another embodiment the rotor bearings are disposed in the liquid flow path outside seals between the rotor and the rotor compartment.

Abstract: A device for fixing a motor-fan unit to a heat exchanger comprising an inner support forming a housing for fixing the motor casing of the motor-fan unit and having a lateral opening providing a passage for ancillary equipment of the motor, an outer support surrounding the inner support and adapted to be fixed to the heat exchanger and connecting armatures joining the inner support and the outer support

Abstract: A method and apparatus for separating entrained gases from a pumped fluid. A degas pipe having an increased inner dimension relative to surrounding process piping is provided to generate a stratified two-phase gas/liquid flow. A controlled release mechanism permits selective removal of gas from the degas pipe.

Abstract: A motor-driven compressor comprises a motor that is carried by a motor-enclosing housing portion, a compressor wheel that is driven by the motor within a second housing portion forming a pressurized enclosure, and means for providing a flow of cooling air for the motor from the pressurized compressor housing portion to the motor-enclosing housing portion. In this motor-driven compressor a small portion of the air flowing through the compressor is directed to the motor housing as cooling air for the motor windings and then is either exhausted to atmosphere or recirculated to the compressor air inlet. As a result, a portion of the internal heat generated in the windings is carried away, permitting a higher level of power to be produced reliably by the motor on a continuous basis and, in turn, allowing the compressor to deliver more compressed air at higher pressure to the receiving entity.

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 centrifugal fan for a motor vehicle has a fan rotor driven in rotation by an electric motor and lodged in a central part of a casing. The outer walls of the casing define, in conjunction with a peripheral portion of the rotor, a volute for channeling air which is delivered by the rotor in a tangential direction. The outer wall of the casing includes a longitudinal side wall portion formed with through apertures constituting diversion ports, for taking off some of the air delivered by the rotor and diverting this air through an external duct fixed to the casing and open into the central region of the latter, so as to cool the motor.

Abstract: A multi-stage compressor having at least two compressor stages comprises an inter-cooler provided between the stages for cooling a gas being discharged from a compressor in the preceding stage. The compressor stages are driven by a common electric motor, of which a rotating shaft is supported by magnetic bearings. A part of the gas cooled by the inter-cooler and a part of the work gas discharged from a bleed valve provided down-stream of a rear stage of the compressor are selectively introduced into the electric motor or the magnetic bearings. Thus, at the time of load operation the gas discharged from the inter-cooler is introduced into the motor or the magnetic bearings to cool them, and at the time of non-load operation the gas discharged from the bleed valve is introduced into the motor or the magnetic bearings to cool them. It is possible to ensure a flow rate of gas required for cooling the motor during non-load operation with economy during load operation.

Abstract: The present disclosure is directed to a power plant, and especially two or more such power plants connected together. The power plant especially features a piston connected with a reciprocated but non-rotating piston rod which connects with a pump piston at the opposite end. Power is generated by the power piston and imparted through straight reciprocating motion to the pumped piston. Two or more of these power plants are operated together by connecting them together through a connective link so that operation of one times the operation of two or more units slaved to the first. Synchronized operation is obtained.

Abstract: Pumps, for example, bilge pumps, comprise a pump housing including an inlet and an outlet, a motor and an impeller assembly coupled to the motor for pumping liquid which passes through the outlet. The motor is advantageously cooled by pumped liquid while being protected from the pumped liquid. Further, the motor is turned on and off in response to actual operating conditions, thereby increasing pump life and reducing overall power consumption. The pump provides contoured facing surfaces which provide a dynamically efficient flow path for the pumped liquid. In addition, a switch housing is preferably provided to allow liquid to contact an activator assembly which turns the motor on.

Abstract: An wet-rotor hydronic heating/cooling circulator in which a check valve is positioned at the inlet eye of the pump impeller, where it can easily be serviced by removing the circulator motor and impeller. The check valve is preferably in the form of a valve subassembly that is removably inserted into an opening at the eye.

Abstract: The invention is directed to a unit serving to convey a liquid medium, in particular a heat carrier, in the cooling and heating system of a motor vehicle. The conveying unit has an electric drive motor for a conveying pump connected in the circuit, which drive motor has a collector and contact brushes contacting the bearing surface of the latter. The conveying member of the conveying pump is connected with one coupling half of a magnetic coupling so as to be fixed with respect to rotation relative to it and the motor armature is connected with the other coupling half so as to be fixed with respect to rotation relative thereto. A unit housing which preferably comprises a plurality of parts encloses a space receiving the motor and a chamber accommodating the conveying member of the pump. A favorable atmosphere is created in the motor space with respect to brush wear by arranging a wall between the two coupling halves, which wall divides the pump chamber from the motor space and allows moisture to pass through.

Abstract: An electric motor operated impeller has a drive motor having a motor shaft, a stator and a rotor rotated about a rotary axis, an impeller housing having a receiving casing which extends in direction of the rotary axis of the rotor and accommodating the electric drive motor. The receiving casing has a wall against which the stator of the drive motor radially abuts a bottom and an opposite edge. A support supports the shaft of the motor and is provided with throughflow openings for cooling air. The wall of the casing has at least one channel-shaped expansion extending parallel to the rotary axis and formed so that the expansion is open toward the edge of the casing and closed toward the bottom of the casing.

Abstract: A canned motor pump having an enclosing casing on the inside of a stator and a rotor on the inside of the enclosing casing, in which the interior parts of the enclosing casing communicates with the interior parts of a pump. Surfaces of supported portions on a shaft of the rotor which are contacted with the liquid flowing on the inside of the enclosing casing are treated by electrolytic polishing so that a liquid liable to polymerization or an adherent liquid can normally circulate as a circulating liquid for cooling a motor, and furthermore supporting portions which support the shaft contain bearings produced from fluororesin or glass-fiber reinforced fluororesin.

Abstract: A pump including a submersible motor sealed within a motor chamber, an impeller rotatably mounted in an impeller chamber, and motor and impeller shafts coupled to one another to interconnect the motor and impeller. The impeller pumps fluid from the impeller chamber into the motor chamber where the fluid flows around the motor to cool the motor and muffle the motor noise before being discharged from the pump. The impeller shaft is rotatably mounted in a bearing fixed to the impeller housing and having grooves facing the shaft and providing fluid communication between the impeller and motor chambers. Fluid flows into the grooves from the impeller or motor chamber depending on the pressure gradient across the bearing, which varies according to downstream pump conditions (e.g., pressure). As the impeller shaft continues to rotate, fluid from the grooves forms a thin lubricating film in the clearance space provided between the impeller shaft and bearing.

Abstract: A motor driven fan capable of operating continuously in a dead-headed mode resulting from complete blockage of airflow from an outlet of the fan is provided. The fan includes a housing defining both a primary passage for directing a flow of air from an inlet to an outlet of the fan, and a secondary passage for directing a flow of air between the inlet of the fan and ambient air surrounding the housing opposite the primary passage. The secondary passage includes a motor compartment having an inlet passage in fluid communication with the primary passage and an outlet passage in fluid communication with the ambient air surrounding the housing. Impeller means, mounted within the housing, provide the flows of air in the primary and secondary passages.

Abstract: A pump unit especially for heat producing and heat distributing plant has an electric motor having a rotor which is sealed against the fluid conveyed by the pump unit. The electric motor which is cooled by the conveyed fluid drives a rotary pump for controlling the speed of the unit. Part of the stream of the conveyed fluid which is diverted for cooling the electric motor and the frequency converter, flows through a cooling jacket which receives the motor. The frequency converter is attached to the outside of the cooling jacket in heat conducting relationship therewith and the frequency converter and the motor are received in a common housing.

Abstract: In a motor pump where the cooling of the motor section and the lubrication of bearings are achieved by an independent circulation system of a treating liquid by an auxiliary impeller, the pressure of a motor section, that is, the pressure of the treating liquid circulating is raised more than the suction pressure of a main process (the suction pressure of a main impeller). The treating liquid circulating from a front rotor chamber is caused to flow through a passage into an inlet port which is separated radially outside by a selected distance L from a suction inlet portion of the auxiliary impeller. This raises the pressure at the inlet port (the pressure of the front rotor chamber) to a pressure which is higher than the pressure at the suction inlet port by a magnitude corresponding to the distance L.

Abstract: A pressurized fluid-driven engine includes an engine chamber defined by a housing having one or more endplates which include serpentine channels for the flow of temperature-regulating fluid. Preferably, each endplate has a pair of channels that each has a scroll pattern. The temperature-regulating fluid may be the same fluid that is employed in driving the engine. The fluid is utilized both to preheat the engine and to cool the engine during use. The engine may be coupled to a generator for the production of electrical energy.

Abstract: A magnetically coupled centrifugal pump comprising a pump housing containing a pumping chamber and having an inlet and an outlet, a shaft mounted in the pump housing for rotation, a pump impeller attached to the forward end of the shaft for rotation with the shaft in the pumping chamber and a first magnet attached to the rear end of the shaft, the first magnet adapted to be magnetically coupled to a second magnet rotated by a rotary driving device, the shaft being mounted in at least two bearings spaced from each other along the length of the shaft and located between the impeller and the first magnet, a shell surrounding the shaft bearings and first magnet to seal the pump from the exterior and prevent the pumped fluid from leaking, the shell being located between the two magnets and being able to transmit magnet forces between the two magnets for magnetically coupling the two magnets together, the pump housing containing a passage for conducting cooling fluid from the discharge of the pump impeller to the b

Abstract: A centrifugal fuel pump with a baffle disposed between a fuel inlet and an impeller of the pump. The baffle overlies the inlet opening and substantially prevents the impeller from producing a backflow of fuel through the inlet. The baffle also directs incoming fuel into a generally circumferential flow into the channel of the pump through which fuel is moved and its pressure increased by the rotating impeller. This improves the efficiency and maximum capacity of the pump.

Abstract: In a horizontal rotary compressor the gas path from the muffler is between the rotor and stator whereupon the flow direction is changed 180.degree. and the flow takes place between the stator and the upper shell. Oil drainage to the sump is in a flow path between the stator and the lower shell. The gas and oil paths serve to cool the rotor and the stator windings. Also, the gas flow reduces oil circulation from the compressor.

Abstract: A cooling system for centrifugal pump bearings and seals for use with a centrifugal pump having a housing containing a pumping chamber and a rotating impeller within the pumping chamber, a passage being formed in the housing, the passage receiving fluid from the pumping chamber and directing the fluid thereby providing cooling fluid flow, and an arcuate groove formed in the housing in fluid communication with the passage, a first end of the groove being adjacent the passage, a second end of the groove being distal of said passage, the groove having a depth which varies from the first end to the second end, the depth at the first end being greater than the depth at the second end.

Abstract: A thermal relief valve is constructed and arranged to sense the fluid temperature of a pump and to open when this fluid temperature becomes too high to discharge pump fluid to prevent the occurrence of an excessive temperature condition of the pump fluid.

Abstract: A submersible pump comprises a motor housing, a pump beneath the housing having an impeller magnetically driven through a division wall by the motor, a heat dissipation wall forming a hollow which extends into the motor housing from the division wall, a hollow bleed post extending upwardly from the bottom of the pump into the hollow of the heat dissipation wall and providing a bleed discharge path from the pump and through the hollow of the wall, and back into the sump of the air conditioner.

Abstract: A housing (10) encloses a dual outlet, dual rotor blower between two cast parts (11 and 12) having internal partitions (31) dividing a volute region (30) of the housing. Flanges (32) on opposite ends of the motor (15) nest between the partitions for mounting the motor and its rotors (16) in the volute region. A discharge plenum (35) communicates with each of the rotors and spans the distance between them, and partitions (31) extend into the plenum. A pair of conveying nozzles (40) discharge from the plenum; but some of the air passes around the ends (33) of partitions (31), where it flows over motor (15) and out through vent openings (34). Confronting flanges (13, 14, and 24) are fastened together to assemble the motor and rotors within two cast parts (11 and 12).

Abstract: A hermetic scroll compressor comprising a compressor component and an electric motor arranged respectively in upper and lower portions of a closed housing. The compressor component includes fixed and orbiting scrolls in mesh with each other. A frame is fixedly connected to the fixed scroll and supports the orbiting scroll for orbiting motion, with at least one passage group of a plurality of vertically extending passages being provided at a peripheral surface of the frame for communicating a space above the compressor component with a space between the compressor component and the electric motor. One of th e passages has a higher fluid resistance than the remaining passages, with the passage having high fluid resistance being vertically aligned with a passage provided at the periphery of the electric motor for communicating the space above the electric motor with a lubricating oil reservoir below the electric motor.

Abstract: The structure consists in a casing, the interior of which affords a chamber for the compressor and a housing for the motor, separated in fluid-tight fashion by a bulkhead through which a sealed passage is offered to the shaft of the compressor; such a casing also exhibits a set of galleries arranged peripherally around the housing, along which the refrigerant is able to flow and thus keep the motor at a given temperature.

Abstract: A pump assembly for delivering liquids or gases include a pump and an electromotor for driving the pump, the speed and/or torque of the electromotor being made variable by a static frequency converter. The frequency converter can be miniaturized by highly-integrated circuits and other provisions for a sufficient emission of dissipation heat. The frequency converter is arranged inside or on the pump assembly, forming a structural unit with pump assembly, and the dissipation heat of the frequency converter is emitted by the fluid delivered or to be delivered by the pump assembly, the fluid acting as dissipator.

Abstract: A vacuum pump comprises a slide shaft having one end provided with a discharging valve and a diaphragm, a cam plate in press-contact with the other end of the slide shaft to cause reciprocating movement of the slide shaft, a shaft of a motor for rotating the cam plate and a bearing casing for holding a bearing which supports the motor shaft in a freely rotatable manner, wherein the cam plate is provided at its one side surface with a recess for receiving the bearing and provided at its other side surface with a cam surface.

Abstract: A canned motor pump having improved dielectric strength at a high temperature above 200.degree. C. is disclosed in which a jacket is arranged on an outer wall of the canned motor section, to an inlet port of which jacket is supplied a portion of pressurized liquid to be treated, while an outlet port of said jacket is connected to a lower pressure zone of the pump section or pump tubing system to circulate the liquid thereto. In accordance with the canned motor pump, the efficient cooling of the canned motor and the economically advantageous pump system without energy loss may be achieved.

Abstract: A horizontal type compressor-motor combination for compressing a gaseous refrigerant is hermetically sealed within a case which contains in its bottom accumulated lubricating oil and is internally divided into compressor and motor chambers respectively housing a compressor device and a motor for driving the compressor device through a common rotor shaft coupling the rotor of the motor and an eccentric rotor of the compressor device and being rotatably supported by inner and outer bearings, the compressor device having a cylinder block interposed between the inner and outer bearings. A compressor-motor of this basic organization is improved by a communication passage formed axial through the rotor shaft for conducting the refrigerant, one end of this passage being connected to the motor chamber, the other end being connected to a delivery chamber of the compressor chamber.

Abstract: This is a device for aerating water comprising (1) a fan within a pumping chamber for drawing air through an intake port and forcing air out an exhaust port therein, (2) a fan enabling means located outside the pumping chamber for moving the fan so that air is drawn through the intake port and out the exhaust port, (3) a means for insulating the pumping chamber from the heat created by the fan enabling means, and (4) a means for dispersing the air flowing out of the exhaust port and into water.

Abstract: A canned motor pump pressurized recirculation system which comprises a main unit and a recirculation line. The main unit includes a main pump, an auxiliary pump and motor means positioned between the main and the auxiliary pumps for driving the pumps. The recirculation line is positioned external of the main unit, and is connected thereto between the pumps. The recirculation line is adapted to pass fluid therethrough such that the fluid will be passed by the auxiliary pump through the motor means to the high pressure portion of the main pump. The auxiliary impeller is adapted for easy replacement by impellers of various sizes.

Abstract: A motor pump set having two coaxial shafts is provided with a fluid circuit for protecting the rotary packing-gland against any ingress of solid particles such as sand. Pumped fluid is withdrawn from an intermediate space of the pump and returned upstream via a duct within the pump shaft in order to lubricate the bearings as it passes. The fraction of the fluid stream which is discharged from the last bearing flows in the vicinity of the packing-gland and is driven through radial discharge ducts under the action of centrifugal force.

Abstract: A scroll compressor enclosed in a hermetic shell, wherein part of the volume enclosed by the shell is at suction pressure and part is at discharge pressure. The compressor includes both a stationary and a driven scroll plate, with intermeshed involute wrap elements attached to the plates for defining pockets in which fluid is compressed as a drive shaft connected to the driven plate causes it to orbit relative to the stationary scroll plate. A passage disposed within the driven plate and adjacent its axial center conveys compressed fluid through the plate and into a cavity formed in the end of the drive shaft. Oil entrained in the compressed fluid is thrown radially outward within the cavity, due to centrifugal force, and is thereby separated from the compressed fluid. The oil then flows through an adjacent bearing, and is thrown radially outward, creating a spray that impinges on a seal which abuts the back surface of the driven scroll plate.