Abstract: An improved booster for use in piped fluid systems includes a motor, a fan wheel and a hermetically sealed tank assembly. Fluids enter the tank assembly through an inlet and are compressed within the tank assembly by a rotating fan wheel, before leaving the tank assembly through an outlet, which may be aligned in a plurality of angular configurations. The motor is powered by a versatile electrical connection which enters the tank assembly through a connector that maintains the hermetically sealed condition in the tank assembly, and can accommodate power of any voltage or frequency. The incremental pressure gain provided by the booster may be controlled by modifying the speed of the rotating fan wheel, and a sled assembly provides structural support and positional alignment for portions of the tank assembly when the booster system is opened for access.

Abstract: A heat-dissipation structure for a motor. The heat-dissipation structure comprises a shaft, a seat and a rotator. The rotator coupled to the seat by the shaft comprises a housing and a cover. The housing comprises an inner side connected to the shaft and a bottom comprising at least one through hole. The cover is connected to an exterior of the bottom of the housing and a distance is formed between the cover and the housing, so that the cover prevents objects from entering the through hole.

Abstract: A vacuum pump evacuates gas from a chamber by coaction of a rotationally driven rotor and a stator. An electrical equipment section that rotates the rotor is housed within a stator column integral with the stator. A cooling water pipe is buried in a wall of the stator column near the electrical equipment section. One end of the cooling water pipe branches into a plurality of water inlet ports and the other end branches into a plurality of water outlet ports. One pair of water inlet and outlet ports opens to the outside of the vacuum pump at a side surface of the stator column and another pair of water inlet and outlet ports opens to the outside at the underside of the stator column.

Abstract: A pump is driven by a compact electric motor in which a coil is disposed in a ring form around and along a stator core which has a plurality of claw magnetic poles that extend alternately from both ends of one member of the stator core toward the end of the other member thereof. A stator core can be made from a compressed powder core by molding with resin, with the molded portion able to serve as a partition separating pump and motor units.

Abstract: An electric compressor provided with an integral inverter, incorporated with a motor and provided in a compressor housing with a motor drive circuit that includes the inverter. At least some of electric parts including the motor drive circuit are coated at an assembly-completed state with a resin material at a predetermined thickness by, for example, pouring of a liquid resin and draining of excess resin. In the electric compressor, a resin coating structure of the motor drive circuit is simplified, is easily coated with resin, is reduced in weight by reducing the amount of resin, and is reduced in cost.

Abstract: A hot-gas blowing fan includes a heat resisting impeller, a bearing, a heat insulting layer, a cooling portion, first and second magnetic couplings, a non-magnetic partition wall, and a collar. The heat insulating layer is disposed between the impeller and the bearing. The impeller and bearing are attached to the rotating shaft. The cooling portion is disposed between the heat insulating layer and the bearing. The cooling portion includes a cooling fluid that does not contact the bearing or the rotating shaft. The collar is positioned between the heat insulating layer and the impeller and is positioned between the heat insulating layer and the rotating shaft. The collar is made of a different material than the heat insulating layer.

Abstract: A computer system comprises a chassis, an electronic component disposed within the chassis, and a cooling fan that comprises a motor support fixed to a housing that is coupled to the chassis and a hub disposed within the housing. A plurality of blades extend radially from the hub. A motor is disposed within a motor enclosure formed by the motor support and the hub. The hub is rotatably coupled to the motor such that the plurality of blades generates a flow of air around the motor enclosure. The system comprises a motor cooler comprising a flow path through the motor enclosure, where the flow path has a first opening and a second opening, and where the second opening is disposed within an area of lowered downstream pressure so as to develop a differential pressure between the first and second openings and generate a flow of air through the motor enclosure.

Abstract: The invention relates to a motor centrifugal pump, particularly as an immersion pump, having a coolant pump that is driven by the electric motor, the pump circulating the coolant of the electric motor and the impeller thereof being driven by the electric motor, wherein the impeller shaft of the coolant pump is connected to the motor shaft via a transmission.

Abstract: A thermal conductor for a heat-generating liquid pump system of a pool containing liquid and including a pipe. The conductor is adapted for conducting heat from the pump system to liquid circulated by the pump system. The conductor includes a body in thermal communication with a heat generating portion of the pump system and in thermal communication with only an outside surface of the pipe and not in direct contact with the liquid.

Abstract: An improved cooling airflow electric motor-driven pump, particularly adapted for pumping condensate from refrigeration and air conditioning systems includes a reservoir body, a reservoir cover supporting an electric motor directly connect to a centrifugal pump impeller at one end of the motor rotor shaft and to an open radial blade blower wheel at the opposite end of the motor rotor shaft. The motor is mounted on the reservoir cover and a motor cover mounted on the reservoir covers defines an aerothermodynamically matched blower wheel shroud and cooling air inlet and discharge ports for the flow of cooling air across the motor and associated electronic controls.

Abstract: A submersible pumping system for downhole use in extracting fluids containing hydrocarbons from a well. In one embodiment, the pumping system comprises a rotary induction motor, a motor casing, one or more pump stages, and a cooling system. The rotary induction motor rotates a shaft about a longitudinal axis of rotation. The motor casing houses the rotary induction motor such that the rotary induction motor is held in fluid isolation from the fluid being extracted. The pump stages are attached to the shaft outside of the motor casing, and are configured to impart fluid being extracted from the well with an increased pressure. The cooling system is disposed at least partially within the motor casing, and transfers heat generated by operation of the rotary induction motor out of the motor casing.

Abstract: A condensate pump that provides a ventilation system that efficiently expels warm air surrounding a pump motor is disclosed. The pump has a motor-driven fan, a cover that encloses the fan, and a ventilation opening that allows for air to enter through the cover. The cover has an exhaust opening adjacent to the fan and a discharge outlet. The space between the exhaust opening and the discharge outlet defines a throat. A cutwater is adjacent to the exhaust opening for focusing air outward through the throat and expelling it from the cover through the discharge outlet.

Abstract: A compressed air unit is provided having a motor housing with a main motor housing having a cavity. A motor is arranged within the cavity and a compressor rotor is connected to the motor. A cooling duct is integral with and extends from the main housing body. The cooling duct is in fluid communication with the cavity. An inner housing includes a main inlet housing body providing a compressor inlet for providing fluid to the compressor rotor. An inlet duct is integral with and extends from the main inlet housing body and in fluid communication with the compressor inlet. A transfer tube is interconnected between the cooling and inlet ducts. A source of clean cooling air is provided by providing a reverse flow pickup from the inlet flow boundary layer at the compressor inlet.

Abstract: According to some embodiments, systems for an integrated pump and reservoir may be provided. In some embodiments, a pump may comprise a housing defining an inlet to accept a fluid and an outlet to evacuate the fluid, an impeller disposed within the housing, wherein the impeller is to move the fluid toward the outlet, a motor to power the impeller, a reservoir hydraulically coupled to the inlet, and a cold plate disposed at least partially within the housing.

Abstract: A cooling device has a closed circulating channel for circulating coolant, and in the channel, a radiator and a contact-heat-exchanger type centrifugal pump are provided. A heat-producing electronic component contacts with the centrifugal pump, and the coolant in the pump collects the heat off the component due to the heat exchanging function. Then the heat is dissipated from the radiator. The pump includes a pump-casing made of highly heat conductive material and an impeller. The pump casing has a base wall and a cover wall opposite the base wall. The base wall has an outer wall face constituting a heat-receiving face, and an inner wall face facing the impeller. The impeller is disposed in a pump room defined between the base wall and cover wall of the casing. A sucking channel is provided between the heat-receiving face and an inner wall face of the pump room. This inner wall has a recess where protrusions extending toward the impeller or dimples are provided.

Abstract: A portable self-priming transfer pump comprising a one piece unitary housing, comprised of a first portion that houses a motor, a second casing portion within which is formed a pump cavity, and a handle; and a one piece cover fitted to the outboard end of the second portion of the housing.

Abstract: A heat-dissipating mechanism for a motor includes a rotor and a stator base. The rotor rotates with respect to the stator base and includes a casing and a hub. The casing has a side portion and a bottom portion, and at least one opening is disposed at the bottom portion. The hub is disposed on the casing, for preventing an external particle from entering the rotor. The hub includes a plurality of separation ribs and when the hub is disposed on the casing, a heat-dissipating passage is formed between every two adjacent separation ribs and the side portion of the casing.

Abstract: The invention relates to a radial fan (1), preferably a high-speed radial fan, comprising a blower wheel (8), a housing (2) which receives a rotor (6) and a stator (5) of an electrical drive (4) of the blower wheel shaft (7), and a cooling system. The aim of the invention is to develop one such radial fan in terms of the cooling system required. To this end, paths (30, 37) for a first cooling medium (Ki) and a second cooling medium (K2) are provided in the housing (2), the second cooling medium (K2) being cooled by the first cooling medium (Ki) by means of the housing (2), and said paths (30, 37) are separated from each other by intact material walls (40) of the housing (2).

Abstract: A fuel supply system is disclosed that includes an electric fuel pump, a controller for controlling operations of the fuel pump, and a cooling plate that is disposed in the fuel tank and cools the controller by contacting the controller. Moreover, the system includes a fuel outlet device that allows for a flow of the fuel onto the cooling plate for heat exchange between the fuel and the cooling plate. A fuel supply system is also disclosed that includes a sub tank disposed in the fuel tank and a fuel pump that is disposed in the sub tank, increases a pressure of the fuel, and moves the fuel. Furthermore, the system includes a controller for controlling operations of the fuel pump and a cooling plate that is disposed in the sub tank and cools the controller by contacting the controller.

Abstract: A fluid transfer systems described herein. The fluid transfer system generally includes a centrifugal multistage pump, a holding tank for holding the fluid operably connected to the pump body via a first conduit, an inlet for receiving the fluid, wherein the fluid is pressurized to form the pressurized fluid, a manifold for passing the pressurized fluid to a second location and an outlet for receiving fluid operably connected to the manifold.

Abstract: A stator core of a motor arrangement includes six cores, which are arranged one after another in a circumferential direction. A bobbin, which is made of dielectric resin, is fitted to each core. Each coil is formed such that a winding is wound around the bobbin through a concentrated winding technique. Dielectric resin is filled between each circumferentially adjacent two teeth to cover each coil. Furthermore, the dielectric resin is molded to form clearances, each of which is formed between the corresponding circumferentially adjacent two teeth on a rotor side. Fuel, which is pressurized by a pump arrangement, passes an interior of the motor arrangement through a fuel passage, which is a gap between an inner peripheral surface of the stator core and an outer peripheral surface of the rotor, and also through the clearances.

Abstract: An arrangement has a turbomachine, a cooler, and a carrying frame that accommodates the turbomachine and the cooler, with frame segments. The cooler has at least one essentially pipe-shaped cooling element disposed horizontally, and the frame segments are disposed at a distance from one another in the longitudinal direction of the cooling element, and have contact points on the underside to support the arrangement on a floor surface or a base frame. The at least one cooling element is attached to the frame segments by way of flexible sections for accommodating thermal deformations of the cooling element.

Abstract: In a supercharger (10) with an electric motor in accordance with the present invention, the electric motor (20) is arranged at a position adjacent to a compressor impeller (6), a center housing (14) has a cooling fluid flow path (34) formed in such a manner as to surround the electric motor (20) and be adjacent to a diffuser portion (25). A first cooling structure portion (38) is formed at a position in the electric motor (20) side in the cooling fluid flow path (34), a second cooling structure portion (39) is formed at a position in the diffuser portion (25) side in the cooling fluid flow path (34). The electric motor (20) is cooled by the first cooling structure portion (38). The diffuser portion (25) is cooled by the second cooling structure portion (39).

Abstract: A downhole dynamic compressor comprises an electric motor having a stator 6 with stationary windings and an armature with permanent magnets 7 supported on gas bearings 9, 10 for rotation relative to the stator. The gas bearings 9 and 10 are arranged at the upstream and downstream opposite ends of the motor, respectively. The dynamic compressor has a bladed wheel 12 mounted on an overhanging end of the motor armature 7 that projects beyond the gas bearing 9 at the upstream end of the motor, whereby all the gas bearings of the compressor and the electric motor are arranged on the downstream side of the dynamic compressor.

Abstract: A screw compressor is for use of a screw chiller, and comprises a pair of screw rotors and a casing housing the screw rotors, a capacity control valve for varying a ratio of volume, a motor for driving the screw rotors and an inverter for varying the rotational speed of the motor. The screw compressor is controlled using rotational speed control means by the inverter and mechanical capacity control means by the capacity control valve independently or combined together according to loads. The maximum efficient point in a capacity control performed solely by the inverter is set to a rotational speed side lower than the rated operation point. In a region where the rotational speed is higher than the maximum efficient point, the inverter solely takes control from a rated rotational speed to a high rotational speed side.

Abstract: A fan includes a plurality of blades 9 carried by a hub housing 10 mounted on a rotatable motor shaft 6. The shaft 6 includes a heat pipe 11 to transfer heat from the motor bearings 7 and 8 to a heat dissipative plate 15. The fan is particularly useful for cooling electrical and electronic equipment housed within a cabinet, such as, for example, in a telecommunications arrangement.

Abstract: A motor includes a rotor and a stator. The stator includes a circuit board on which a control circuit for controlling rotation of the rotor is formed. A circuit component of the control circuit is mounted on a surface of the circuit board facing a base portion. A heat conductive member is arranged between the base portion and the circuit component to be in contact with the base portion and the circuit component. Thus, a heat generated by the circuit component is transferred to the base portion through the heat conductive member and is then transferred to connecting portions and a wall of a housing which are formed integrally with the base portion from thermally conductive material.

Abstract: An apparatus (20) may comprise a fuel tank (10), a cover (22), a fuel discharging unit (30), a control unit (26), and a heat sink (28). The cover (22) closes an opening (12) in an upper portion of the fuel tank (10). The fuel discharging unit (30) is disposed within the fuel tank (10), and the fuel discharging unit (30) draws fuel into the fuel tank and discharges the drawn fuel outside the fuel tank. A biasing member (25) may be disposed between the fuel discharging unit (30) and the cover (22), and bias the fuel discharging unit (30) toward the bottom surface of the fuel tank (10). The control unit (26) controls the fuel discharging unit (30). The heat sink (28) is thermally connected to the control unit (26), and dissipates heat from the control unit (26). The heat sink (28) may include an extended portion (28b) extending in an up-down direction in the fuel tank (10). The fuel discharging unit (30) may be slidably supported by the extended portion (28b).

Abstract: A fuel supply system is disclosed that includes an electric fuel pump, a controller for controlling operations of the fuel pump, and a cooling plate that is disposed in the fuel tank and cools the controller by contacting the controller. Moreover, the system includes a fuel outlet device that allows for a flow of the fuel onto the cooling plate for heat exchange between the fuel and the cooling plate. A fuel supply system is also disclosed that includes a sub tank disposed in the fuel tank and a fuel pump that is disposed in the sub tank, increases a pressure of the fuel, and moves the fuel. Furthermore, the system includes a controller for controlling operations of the fuel pump and a cooling plate that is disposed in the sub tank and cools the controller by contacting the controller.

Abstract: An impeller, which is driven by a stator, includes a conducting shell, a hub and a plurality of blades. The conducting shell covers at least one side of the stator. The hub covers the conducting shell. At least one air gap is formed between the hub and the stator. A top portion of the hub has an opening to partially expose a top portion of the conducting shell. At least one airflow passage is formed between an inner wall of the hub and an outer surface of the conducting shell. The airflow passage has at least one inlet connected with the opening and at least one outlet connected with the air gap. The blades are disposed around the circumferences of the hub.

Abstract: An electric motor-driven pump, particularly adapted for pumping condensate from refrigeration and air conditioning systems includes a reservoir body, a reservoir cover supporting an electric motor directly connected to a centrifugal pump impeller at one end of the motor rotor shaft and to a centrifugal cooling air fan at the opposite end of the motor rotor shaft. The motor is mounted on the reservoir cover and a motor cover mounted on the reservoir cover defines cooling air inlet and discharge ports for the flow of cooling air propelled by the fan. Efficient cooling air movement is obtained in a mechanically uncomplicated arrangement.

Abstract: Disclosed is an axial fan motor for air-cooling a heat sink of a heating element and thermally connected to the heat sink. The casing of the axial fan motor is formed of a plurality of laminated metal plates. The plurality of metal plates include a single first metal plate and a plurality of second metal plates. The single first metal plate, which is an outermost layer located at the air exhaust side of the fan, has a peripheral portion, a central portion, and a plurality of arm portions for connecting the peripheral portion and the central portion. A bearing holder for supporting a rotary shaft of the fan is attached to the central portion.

Abstract: There is provided a fan motor in which an increase in the temperature of windings thereof is surpressed, thereby achieving a long life and high performance. Vent holes 33 for introducing air into a cup-like member 9 are formed in a bottom wall section 9b of a rotor 6. Air flowing direction adjusting ribs 37, which are arranged at intervals in a peripheral direction and each of which extends in a radial direction, are integrally provided on the inner surface of the bottom wall section 9 so that air flown out of exits 33b of the vent holes 33 is directed toward windings 3. In addition to the air flowing direction adjusting ribs 37, a plurality of air stirring ribs 39 for stirring the air inside the cup-like member 9 is arranged on the inner surface of the bottom wall section 9.

Abstract: The invention relates to an electrically driven flow compressor comprising a drive (2, 3)—and a flow compressor and a converter (5) for electrical supply and control of the drive unit (2, 3).According to the invention, the converter (5) and the drive unit (2, 3) form an integral arrangement. Said inventive flow compressor has a reduced size, excellent electromagnetic performance and reduced production costs compared to flow drives with an external frequency converter.

Abstract: An electric motor includes a housing and a circular stator. The housing has an inner circumferential surface. The housing also has a first predetermined thermal expansion coefficient. The housing further has an elastic part. The stator core is pressed to an inside of the housing by tight fit. The stator core has an outer circumferential surface. The stator core also has a second predetermined thermal expansion coefficient that is different from the first predetermined thermal expansion coefficient. A void is defined between the inner circumferential surface and the outer circumferential surface so as to prevent the inner and the outer circumferential surfaces from contacting each other in a circular region. When the housing and the stator core expand or shrink so as to tightly fit each other due to a differential between the first and second predetermined thermal expansion coefficients, the elastic part corresponding to the void is elastically deformed.

Abstract: A compressor unit comprises a centrifugal compressor (1) for compressing a gas, having a rotor (2) with one or more compressor impellers (3), and an electric motor (4) having a stator (5) and a rotor (6), for driving the rotor (2) of the compressor. The compressor and the electric motor are accommodated in a common gas-tight housing (7) which is provided with a gas inlet (8) and a gas outlet (9). The rotor of the compressor and the rotor of the electric motor are arranged on a common rotor shaft (10) which is mounted in magnetic bearings (11, 12, 15). The rotor shaft (10) comprises a single unit and is mounted in two radial magnetic bearings (11, 12), each in the vicinity of one end of the common rotor shaft, and one axial magnetic bearing (15), which is arranged in the vicinity of one (11) of the radial bearings.

Abstract: Disclosed is an axial fan motor for air-cooling a heat sink of a heating element and thermally connected to the heat sink. The casing of the axial fan motor is formed of a plurality of laminated metal plates. The plurality of metal plates include a single first metal plate and a plurality of second metal plates. The single first metal plate, which is an outermost layer located at the air exhaust side of the fan, has a peripheral portion, a central portion, and a plurality of arm portions for connecting the peripheral portion and the central portion. A bearing holder for supporting a rotary shaft of the fan is attached to the central portion.

Abstract: The present invention provides a high-pressure blower comprising a fan arrangement which includes a fan, and a fan housing for conveying working air. An electromotor drives the fan via a motor shaft to provide motor self-ventilation by generating a cooling air stream flowing through the motor due to a cooling wheel driven by the rotor. A wall section separates the interior space of the fan housing accommodating the fan airtight from the interior space of the blower accommodating the electromotor so that the cooling air stream flowing through the electromotor is separated and independent of the air flow of the working air conveyed to the fan.

Abstract: An induction motor system comprising an induction motor, equipped with a heat recovery and water pumping apparatus and an apparatus for controlling the electrical efficiency and resulting heat generation of the induction motor. The motor is adapted to be coupled to an AC source for supplying an AC signal. The controlling apparatus includes a switching device, user controls and optional inputs. The switching device is connected in series with the motor and is operative in either a high impedance state wherein significant current flow through the motor is prevented or a low impedance state wherein current flow through the motor is substantially undisturbed. The user controls provide motor operational input signals. The optional inputs provide setpoint and sensed water temperature input signals.

Abstract: An inside-out ceiling fan motor has a stator mounted to a downrod with an annular array of stator coils positioned about a rotor axis of rotation. A rotor is rotatably mounted about the stator. The rotor has a plurality of vanes spaced along the rotor periphery and canted at an angle of attack to a plane of rotor vanes rotation oriented normally to the rotor axis of rotation to scoop ambient air into the rotor during fan operation through the stator coils to cool them.

Abstract: This invention provides a small, high efficiency, oil free motor driven compressor/blower suitable for providing pressurized, contamination-free gas and or air to transportation, industrial and aerospace fuel cell systems or other contaminant-intolerant applications. The motor driven compressor/blower rotor assembly is supported by foil air bearings and rotates at high speed by using a high frequency drive. The impeller is a centrifugal type design. The MDC can be easily integrated into the air management system of a fuel cell.

Abstract: A blower unit includes a housing, a shroud, a motor, a feed air impeller, a fan casing and a cooling air impeller. A motor shaft extends from both ends of the motor. The feed air impeller is attached to a front of the motor and the cooling air impeller is attached to a rear of the motor. The feed air impeller is contained in the fan casing. The shroud retains the motor and forms a guide chamber around the fan casing. The shroud is retained in the housing. Air is drawn through a front of the housing by the cooling air impeller. The air flows between the motor and the shroud and out of a bottom of the housing. Air is drawn by the feed air impeller and forced through the plurality of apertures in the fan casing and through a housing outlet by the feed air impeller.

Abstract: A cooling fan with dual blade sets has an impeller formed by a rotatable hub, a stator assembly, and a shell. A plurality of mini blades and a plurality of guide blades are respectively formed on a bottom surface and an external surface of the rotatable hub. The impeller has a plurality of holes defined on the bottom surface being arranged in a circle adjacent to the mini blades. Therefore when the impeller rotates, the mini blades are able to drive out the heat in an inner space between the impeller and the shell through the holes to outside.

Abstract: Disclosed is an axial fan motor for air-cooling a heat sink of a heating element and thermally connected to the heat sink. The casing of the axial fan motor is formed of a plurality of laminated metal plates. The plurality of metal plates include a single first metal plate and a plurality of second metal plates. The single first metal plate, which is an outermost layer located at the air exhaust side of the fan, has a peripheral portion, a central portion, and a plurality of arm portions for connecting the peripheral portion and the central portion. A bearing holder for supporting a rotary shaft of the fan is attached to the central portion.

Abstract: A centrifugal blower is provided which incorporates a self-contained air cooling system. The blower includes a drive assembly connected to a drive motor and disposed within a housing having inlet and outlet apertures. A centrifugal compressor is connected to the drive assembly and disposed exteriorly to the housing adjacent to the outlet apertures. Rotation of a drive pulley, including a fan, by the drive motor causes air to enter the housing through the inlet apertures, flow over components of the drive assembly, and exit through the outlet apertures. A spindle assembly having a rigid bearing arrangement is also provided. One or more bearing elements are disposed at opposite ends of a spacer and between a shaft and housing of the spindle assembly. Such rigid pre-loaded bearing arrangement eliminates “unloading” concerns, and allows load sharing between bearing elements.

Abstract: A hydrogen blower is provided and includes a housing having a drive unit and a compressor unit disposed therein. The drive unit is separated from the compressor unit by a neutral chamber, whereby the neutral chamber effectively seals the drive unit from the compressor unit. The drive unit includes a drive shaft, whereby the drive shaft extends generally between the drive unit and the compressor unit to selectively drive the compressor. In addition, the drive shaft fixedly supports a series of fan blades such that rotation of the drive shaft imparts a pressure on the neutral chamber to effectively seal the drive unit from the compressor unit. In this manner, the drive motor, compressor, and drive shaft may be packaged in a single housing while effectively sealing the drive unit from the compressor unit through cooperation between the fan blades and the neutral chamber.

Abstract: A cooling fluid pump in which a cooling fluid is caused to flow to cool a heating element includes a casing brought into a direct contact or an indirect contact via a heat transfer member with the heating element, a pump chamber defined in the casing, an impeller rotatably mounted in the pump chamber and including a pump groove formed in either one of both axial end faces, the impeller having an axis of rotation located radially away from a center of the casing, an inlet formed in the casing so that the cooling fluid is supplied through the inlet into the pump chamber by an action of the pump groove with rotation of the impeller, and an outlet formed in the casing so that the cooling fluid is discharged through the outlet out of the pump chamber by an action of the pump groove with rotation of the impeller.

Abstract: A two-stage compressor for generating necessary pressure differential for air-conditioning applications with air-cooled, water-cooled and evaporative-cooled condensing systems using low-pressure refrigerant, such as R134a, is provided. A rotating assembly is mounted for rotation in a compressor housing and includes a shaft, a thrust bearing disk associated with the shaft to maintain an axial position of the rotating assembly, a motor rotor mounted on the shaft, and first and second impellers mounted for rotation with the shaft. First and second journal bearings are mounted in the compressor housing to support the shaft and maintain radial positioning of the rotating assembly. Volute housings including a spiral-shaped volute are associated with each of the impellers to collect and further discharge gas compressed by the impellers. Diffusers having air-foil shaped vanes are locate in the volute channels adjacent the discharge outlets of the impellers to aide in the discharge of gas from the impellers.

Abstract: A pump including an electric motor mounted in a motor casing, and a rotatable pumping member, the pumping member when rotated by the motor pumping a first fluid, there being a first fluid flow path for the first fluid from a high pressure side of the pumping member, into the motor casing to cool the motor, and to a low pressure side of the pumping member, the pump further including a heat exchanger located between a wall of the motor casing and a heat load, the heat exchanger including a second fluid flow path for a second fluid so that in use, heat is exchanged between the first and second fluids.

Abstract: An insulated box fan, which includes an outer metal housing with two vertical metal brackets to which a plastic isolator ring is attached, and which ring is also attached to the fan motor, to electrically insulate it from the fan housing, and to direct additional cooling air to the fan motor.