Abstract: Disclosed are degassers, couplings, impeller shafts and impellers for use in molten metal. One such coupling transfers gas into an impeller shaft, the coupling having a smooth, tapered internal surface to align with a corresponding surface on the impeller shaft and help prevent gas leakage and to assist in preventing damage to the impeller shaft. Improved impellers for shearing and mixing gas are also disclosed, as is a degasser including one or more of these components.

Abstract: A variable output pump includes a fluid input, a control stage pump having an input portion and an output portion, a main stage pump having an input portion and an output portion, and a differential linkage in mechanical communication with the control stage pump and the main stage pump. The input portion of the control stage pump is in fluid communication with the fluid input and the input portion of the main stage pump is in fluid communication with the fluid input and the output portion of the control stage pump.

Abstract: Systems and devices for thermodynamically regulating portions of a dynamoelectric machine are disclosed. In one embodiment, a fan assembly element includes: an axially inner shroud segment configured to form a portion of an annular assembly about a rotor of a dynamoelectric machine, wherein the axially inner shroud segment includes a rotor hub interface configured to physically connect to a complementary portion of a rotor hub; a set of fan blades physically connected to and extending axially from a face of the axially inner shroud segment; and an axially outer shroud segment physically connected to the set of fan blades.

Abstract: The mainline electric oil pump assembly relates to the field of assemblies for pumping oil in main oil pipelines. The aim of the present invention is to create a mainline electric oil pump assembly with improved technical and economic characteristics, reduced noise and vibrations, and increased reliability, service life and performance. The main distinguishing features of the proposed assembly which contribute to the achievement of the aforementioned aim are: the non-splined, zero-backlash seating of the impeller on a smooth shaft, the use of roller bearings seated in a non-splined, zero-backlash fashion on the smooth shaft, the use of mechanical seals seated in a non-splined, zero-backlash fashion on the smooth shaft, the use of self-correcting adjustable spherical supports under the supporting feet of the pump, and the boring of the seating surfaces of the pump housing for the rotor in a single set-up operation.

Abstract: A submersible pumping system, electrical submersible pump, and method of providing enhanced alignment of motor and driven shafts of submersible pumping systems and electrical submersible pumps, are provided. An example of an electrical submersible pump system includes a pump, a pump motor, and a seal section. The motor drives the pump via motor and driven shafts rotatingly coupled with a coupling assembly. The coupling assembly maintains the shaft ends in coaxial alignment with an alignment device. The alignment device is profiled on opposite ends for mating engagement with the centering guides extending from the shaft ends.

Abstract: The fan assembly having multiple centrifugal fans in mechanical connection with a planetary gear system is a novel improvement to the field of fans, and which includes at least two centrifugal fans that are in mechanical connection with a single drive source. A planetary gear system connects the centrifugal fans to the single drive source such that all centrifugal fans work in concert. The assembly includes a housing that is constructed of a first portion positioned atop and able to rotate with respect to a second portion. The ability of the first portion to rotate with respect to the second portion enables the first portion where the centrifugal fans to rotate 360 degrees. The first portion includes partitions, which isolate each centrifugal fans from one another.

Abstract: An impeller comprises an impeller body, a plurality of stems, a blade mounting member, and a plurality of blades. The stems radially extend with one end of each stem fixed to a portion of a circumferential wall of the impeller body in the vicinity of a suction port, and are arranged at intervals in a circumferential direction of the circumferential wall. The stems assist the impeller to suck air Jn an axial direction through a suction port during rotation of the impeller. The blade mounting member is disposed concentrically with the circumferential wall of the impeller body. The other end of each stem is fixed to the blade mounting member. The blades are arranged at intervals in the circumferential direction and extend along an axial line toward a second wall portion, with one end of each blade fixed to the blade mounting member.

Abstract: A submersible pumping system, electrical submersible pump, and method of providing enhanced alignment of motor and driven shafts of submersible pumping systems and electrical submersible pumps, are provided. An example of an electrical submersible pump system includes a pump, a pump motor, and a seal section. The motor drives the pump via motor and driven shafts rotatingly coupled with a coupling assembly. The coupling assembly maintains the shaft ends in coaxial alignment with an alignment device. The alignment device is profiled on opposite ends for mating engagement with the centering profiles extending into the shaft ends.

Abstract: An exhaust fan has an annular exhaust duct, a fan wheel, and a drive motor inside the core of the exhaust duct, and not inside the annular passage for the exhaust fluid. The exhaust duct has a tubular window frame extending between the inner and outer walls of the exhaust duct and creating service windows for a worker to reach in an de-couple the driver motor from both a bracket for its mount and also from the fan wheel. Temporary locking mechanisms actuated from reaching through the service windows removably hold the fan wheel to the exhaust duct while the drive motor is de-coupled and removed. The exhaust fan further includes self-centering mechanical connections between the drive motor and fan wheel so that the fan wheel does not have to be removed to be re-balanced.

Abstract: A surface pump assembly having a thrust chamber with a telescoping shaft. In some embodiments, the surface pump assembly has a pump with a pump shaft, a thrust chamber with a telescoping shaft extending therein, the telescoping shaft extendable to engage the pump shaft and retractable to disengage the pump shaft, and a motor coupled to the telescoping shaft and operable to rotate the telescoping shaft. In some embodiments, the telescoping shaft has a rotatable shaft member, an adjusting nut threadably disposed thereabout, wherein the adjusting nut is moveable axially relative to the shaft member by rotation, and a first sleeve translatably disposed about the shaft member.

Abstract: An electric fan includes a fan shaft driven by a fan motor supported by a motor support. An oscillating device includes a rotational shaft connected to the motor support for driving the motor support to oscillate. A transmission gear has an axle connected to the rotational shaft and a gear wheel mounted around the axle and driven by a synchronous motor. An oscillating angle limiting switch detects a rotational angle of the rotational shaft and the gear wheel and sends a signal indicative of the rotational angle. A circuit board has a processor coupled to the oscillating angle limiting switch and receives the signal. A comparing program compares the rotational angle indicated by the signal with a selected one of a plurality of preset rotational angles. The synchronous motor is driven when the rotational angle indicated by the signal is equal to the selected preset rotational angle.

Abstract: Pump apparatus, systems and methods of making and using same are disclosed. One inventive system includes a coupling member, a first shaft and a second shaft, the coupling member connecting the first shaft with the second shaft, the coupling member defining a first axial chamber accepting the first shaft, and a second axial chamber accepting the second shaft, the chambers separated by a coupling plate, the chambers including torsional motion transmitting elements and axial motion securing elements in the first and second axial chambers for axially securing the shafts in the coupling member. This abstract allows a searcher or other reader to quickly ascertain the subject matter of the disclosure. It will not be used to interpret or limit the scope or meaning of the claims.

Abstract: A connecting piece for an air pump comprises a first connecting board and a second connecting board, and the bottom of the first connecting board is connected with the top of the second connecting board. A first mounting hole is set up on the first connecting board, and a compression chamber is mounted in the first mounting hole. A second mounting hole is set up on the second connecting board, and a power device is mounted in the second mounting hole. The first and second mounting holes are both through holes. The air pump includes a power device and a transmission device connected together via the connecting piece.

Abstract: An electrical submersible pumping assembly having a seal section and a motor section, and seals that prevent leakage from the seal section and the motor section during assembly. The seals cooperate with a coupling assembly for coupling together shafts from both the seal section and motor section. The coupling assembly outer diameter enlarges at a shoulder that circumscribes its outer surface. In one example, the seal that prevents leakage from the seal assembly provides a sealing interface around the larger diameter portion of the coupling assembly, that is removable by sliding the coupling so its smaller diameter portion is adjacent the seal assembly. The motor section is sealed by another sealing assembly that includes a body that circumscribes the motor shaft to define an annulus, a sealing disk selectively fills the annulus. The sealing disk can also be slid away from within the body while coupling the shafts with the coupling assembly.

Abstract: A rotary vacuum pump comprises, between the rotor (2) and a driving motor, a control unit (1; 101) for operatively connecting the pump and the motor only in the periods in which the pump operation is required or desired.

Abstract: A centrifugal compressor is provided. The centrifugal compressor includes a plurality of diffuser vanes arranged in a circumferentially spaced array about a machine axis. Each diffuser vane is mounted on a respective shaft. Each of the shafts is coupled to a ring that is rotatable about the machine axis. A worm drive is provided that includes a worm that meshes with a worm gear or a segment of a worm gear mounted along a portion of the circumference of the ring. A step motor is coupled to the worm. The step motor is operable to rotate the worm about a worm axis perpendicular to the machine axis, such that the worm drive transmits rotational torque from the step motor to the ring, to resultantly vary the position of the diffuser vanes.

Abstract: A pump assembly for an emergency eyewash station and method of retrofitting a plumbed emergency eyewash station is disclosed. The pump is configured into two parts, an impeller assembly and a drive assembly, that are configured to couple together. The impeller assembly is isolated from the drive assembly and can be easily replaced to ensure a sterile fluid path is maintained for the eyewash fluid. The drive assembly can be fluid powered or an electric motor as desired. The present invention allows a plumbed eyewash station to be retrofitted to use a sterile eyewash fluid. The present invention can also be used in portable eyewash station units too.

Abstract: An improved delivery system for pumping fluid from a pay zone to the surface of a well consisting of a pump situated near the pay zone of the well, a drive head at the surface of the well and a rod string connecting the two, wherein a transmission is interposed between the pump and drive head on the rod string and fluid pumped from the pay zone passes through conduits, extending longitudinally in isolation through the transmission.

Abstract: An electrical submersible well pump assembly having a pump, a pump motor, a seal section, and an intake in the head of the seal section for drawing well bore fluid into the pump assembly. A shaft extends from the motor for driving the pump, a shaft coupling is included within the intake for connecting the shaft to the pump.

Abstract: A pump end assembly has a centrifugal pump and a motor separated by a chamber. The chamber contains a thrust bearing as well as an intake for the pump. Fluid flowing into the intake flows through the thrust chamber and to the inlet of the pump. Some of the fluid also flows through the thrust bearing for lubricating the thrust bearing.

Abstract: A limited free-motion coupling device 10 coupling an impeller 14 to a shaft 16 of a rotor 12, the coupling device 10 comprising first and second parts 20, 22 which are axially engaged for relative angular displacement about a rotational axis A, and two spherical coupling members 24 for engaging the first and second parts 20, 22 to prevent the relative angular displacement. One of the first and second parts 20, 22 is provided on the shaft 16 of the rotor 12, and the other is provided on the impeller 14. The first part 20 comprises two spaced coupling member arms 30 which project radially. The second part 22 comprises a cylindrical wall 66 extending coaxially with the rotational axis A of the coupling device 10. Two spaced arcuate channels 50 are formed in the cylindrical wall 66. Each coupling member 24 is received in and projects radially from a respective arcuate channel 50, and is freely movable between end walls of the arcuate channel 50.

Abstract: An improved delivery system for pumping fluid from a pay zone to the surface of a well in which the well casing is fitted with a pump lodged in the pay zone of the well, a drive head at the surface of the well and a rod string connecting the two, wherein a transmission is interposed between the pump and drive head on the rod string and fluid pumped from the pay zone passes through conduit, extending longitudinally in isolation through the transmission.

Abstract: A vacuum pump includes a rotor assembly mounted on a driven shaft, and a motor for rotating a drive shaft in forward and reverse directions. A drive member on the drive shaft engages a driven member on the driven shaft. Each member has first and second impact surfaces. The members are configured to permit at least one quarter of a revolution of the drive member relative to the driven member in either the forward or the reverse direction before one of the impact surfaces of the drive member impacts upon a corresponding impact surface of the driven member. This enables the drive member to acquire sufficient angular momentum before it impacts the driven member such that the amount of energy transferred to the driven shaft upon impact can be sufficient to free a pump that has become locked by process deposits.

Abstract: Pump apparatus, systems and methods of making and using same are disclosed. One inventive system includes a coupling member, a first shaft and a second shaft, the coupling member connecting the first shaft with the second shaft, the coupling member defining a first axial chamber accepting the first shaft, and a second axial chamber accepting the second shaft, the chambers separated by a coupling plate, the chambers including torsional motion transmitting elements and axial motion securing elements in the first and second axial chambers for axially securing the shafts in the coupling member. This abstract allows a searcher or other reader to quickly ascertain the subject matter of the disclosure. It will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).

Abstract: A cooling fan assembly, and method of operation, for use in an engine compartment of a vehicle is disclosed. The cooling fan assembly includes an electric motor having a motor shaft extending therefrom, a one-way clutch bearing mounted on and rotating with the motor shaft, and a cooling fan. The cooling fan includes a central hub with fan blades extending from the central hub. The central hub engages the one-way clutch bearing such that torque is transmitted from the motor shaft to the central hub in a first direction of rotation and torque is not transmitted from the motor shaft to the central hub in an opposed direction of rotation.

Abstract: A portable bulk transfer pump assembly (10) constructed in accordance with the principles of a preferred embodiment of the present invention is configured for transferring fluid (not shown) in bulk. The illustrated portable bulk transfer pump assembly (10) broadly includes a portable housing (12) that carries a pumping assembly (14). The portable housing (12) is sized and configured to both support the pumping assembly (14) and enable the entire pump assembly (10) to be readily and easily manually transported to and from pumping locations. The pumping assembly (14) is configured to pump low, medium, and high viscosity fluids utilizing a single pump (52) and a drive assembly (54) drivingly coupled to the pump (52) and selectively adjustable to operate the pump (52) at varying speeds. The illustrated drive assembly (54) includes a motor (80) and a variable speed transmission (82) disposed between the motor (80) and the pump (52).

Abstract: The invention combines the features of a supercharger, a turbocharger and turbo-compounding into one system, utilizing a hydraulic or mechanical continuously variable transmission to drive the turbocharger up to a specific speed or intake manifold pressure and then holding the ideal speed to keep it at the right boost pressure for the engine condition. The benefits of a supercharger, which is primarily good for high torque at low speed, and a turbocharger, which is usually only good for high horsepower at high speeds are merged. Once the exhaust energy begins to provide more work than it takes to drive the intake compressor, the invention recovers that excess energy and uses it to add torque to the crankshaft. As a result, the invention provides the benefits of low speed with high torque and the added value of high speed with higher horsepower or better fuel economy all from one system.

Abstract: A limited free-motion coupling device 10 coupling an impeller 14 to a shaft 16 of a rotor 12, the coupling device 10 comprising first and second parts 20, 22 which are axially engaged for relative angular displacement about a rotational axis A, and two spherical coupling members 24 for engaging the first and second parts 20, 22 to prevent the said relative angular displacement. One of the first and second parts 20, 22 is provided on the shaft 16 of the rotor 12, and the other is provided on the impeller 14. The first part 20 comprises two spaced coupling member arms 30 which project radially. The second part 22 comprises a cylindrical wall 66 extending coaxially with the rotational axis A of the coupling device 10. Two spaced arcuate channels 50 are formed in the cylindrical wall 66. Each coupling member 24 is received in and projects radially from a respective arcuate channel 50, and is freely movable between end walls of the arcuate channel 50.

Abstract: The invention concerns a washing fluid pump (1) for windows and/or headlamp cleaning installations on motor vehicles including at least one motor, at least one pump housing (2) with at least one impeller (11) arranged therein, at least one intake (8) and at least two selectively actuable outlets (7). The washing fluid pump (1) is distinguished in that the pump housing (2) includes at least two pump chamber regions which are arranged in mutually superposed relationship, that at least two outlets (7) are associated with different pump chamber regions, and the impeller (11) is axially displaceably supported in the pump housing (2) in such a way that it can assume its operative position selectively in one pump chamber region or the other.

Abstract: An impeller, and impeller and rotor assembly, for use with a permanent magnet motor that provide uni-directional rotation. The impeller and rotor assembly includes an interconnecting arrangement and a locking arrangement that permit continuous rotation in a first direction and prevent continuous rotation in a second opposite direction.

Abstract: A centrifugal pump for a household appliance includes a synchronous alternating current electrical motor having a permanent magnet rotor and a bladed impeller coupled to an end of the rotor which extends into a cavity in the hub thereof. The rotor and the hub are provided with transverse coupling formations, respectively, which have angular extensions with angular play between the rotor and the impeller for promoting the starting of the motor. The rotor coupling formation includes a transverse appendage on a rigid drive body secured to the rotor, and a resilient damping formation molded onto the drive body and having two end portions for engaging the impeller coupling formation, and an intermediate portion which interconnects the end portions and extends at least partially through the drive body so that the damping formation as a whole is constrained axially and angularly on the drive body.

Abstract: A high-speed fluidic device has a friction roller type speed-increasing mechanism, an electric motor, and a high-speed fluidic machine, wherein: the friction roller type speed-increasing mechanism includes a housing, a low-speed side member having an outer ring provided at one end portion thereof, a high-speed side shaft rotatably supported by the housing so as to be eccentric to the low-speed side member and the outer ring, at least one guide roller rotatably supported between the outer ring and the high-speed side shaft, and at least one movable roller rotatably supported between the outer ring and the high-speed side shaft; the electric motor drives the friction roller type speed-increasing mechanism; and the high-speed fluidic machine is connected to the high-speed side shaft so as to be driven by the high-speed side shaft.

Abstract: A bilateral pump unit comprises a housing including first, second, third, and bottom walls jointly defining a receiving space therebetween. A power input is attached to the first wall and having an output arranged in the receiving space. A first pump is attached to the second wall and providing first input and output ports, the first pump is coupled to the output of the power input through an input of the first pump. A second pump is attached to the third wall and provides second input and output ports, the second pump includes an input mechanically coupled to the input of the first pump.

Abstract: The present invention provides a fan installation for a cooling system of a motor vehicle, comprising at least two fans which respectively have an electric fan motor arranged in a separate housing and a fan wheel which can be driven by the fan motor. The fan installation also comprises a control unit for operating the fan motors. The invention provides for an improved fan installation with a simple and cost-effective design, which is achieved by arranging the control unit in the housing of one of the fans for operating both fan motors.

Abstract: A fluid pump includes a housing, a drive source, a rotary unit and a pumping mechanism. The drive source is accommodated in the housing and includes a rotary member for rotation. The rotary unit includes the rotary member and a rotary shaft, which is operatively connected to the rotary member for rotation. The rotary unit forming an engaging portion for engaging with a maintenance tool which is prepared outside the housing. The pumping mechanism is placed in the housing and is operated in accordance with the rotation of the rotary shaft. An allowing means is formed in the housing for allowing the maintenance tool to engage with the engaging portion so as to face the engaging portion. The rotary shaft is rotated by rotating the maintenance tool in a state that the maintenance tool is engaged with the engaged portion.

Abstract: In a fluidal machine with an impeller rotating to urge a fluid radially outwardly by a centrifugal force, a vane guiding the fluid discharged from the impeller, a vane member which includes a front end of the vane facing to the impeller so that the fluid discharged from the impeller strikes against the front end and which is prevented from contacting the atmosphere, and a casing surrounding the vane member and contacting the atmosphere, the vane member is discrete from the casing, a vibration propagation between the vane member and the casing is prevented or restrained, and a vibration of a pipe extending from the casing is absorbed.

Abstract: Disclosed are couplings for use in devices positioned in a molten metal bath. One is a rigid coupling that may include a counterweight, the coupling to reduce nonconcentric movements during rotation of a shaft, particularly a rotor shaft. Another coupling uses magnetic force, rather than a direct physical connection, to form a driving connection between a drive shaft (such as a motor drive shaft) and a driven shaft (such as a rotor shaft). In the event the rotor is jammed, the increased torque creates an overload that disconnects the drive shaft from the driven shaft in order to help prevent damage to the rotor, driven shaft, drive shaft and other components. Also disclosed is a coupling to transfer gas into a shaft, the coupling having a non-threaded internal surface to help prevent gas leakage and thus assist in preventing any resulting damage to the coupling and shaft.

Abstract: An air pump is provided with a motor body having an air slot to allow air to flow from the air slot to air inlets positioned in a front sealing cap of the motor body. The air inlets are aligned with air holes in a closed housing. A shaft of the motor body extends into the closed housing which houses a piston. The shaft of the motor body is connected to gearing mechanisms in the closed housing to provide reciprocating motion of the piston. The piston includes an air inlet and a valve. The reciprocating movement of the piston causes air to travel through the piston into a cylinder above the piston. The design of the pump affords a cooling function to both the motor body and cylinder while reducing the noise of the pump.

Abstract: An impeller shaft assembly, coupler and molten metal pump are described, in which a coupling member is configured to be secured to a pump drive shaft and includes a socket part that is defined by a socket wall formed about and extending along an axis. The socket wall includes a plurality of coupling shaft engaging surfaces and a plurality of socket corner surfaces joining the shaft engaging surfaces. The socket corner surfaces are disposed radially outward from adjacent shaft engaging surfaces with respect to the axis.

Abstract: A centrifugal compressor that includes a low speed shaft connected to a drive motor and a high speed shaft containing an impeller. The high speed shaft is coupled to the low speed shaft by a gear train. The low speed shaft is supported by hydrodynamic, oil lubricated, bearings while the high speed shaft is supported by roller and ball bearings. Any vibrational stresses developed in the high speed shaft are dampened by the low shaft system through the gear train coupling.

Abstract: A driven-side rotor shaft end of an electric motor is drive-connected to a drive-side pump shaft end of a pump via a coupling piece, in the manner of a cardan joint, in each case by means of the positive axial plug receptacle. The invention provides protection against torsional thrusts and axial vibrations, and a play-free drive by virtue of a conical design of the plug receptacle, at the same time with a mutual axial prestress of the rotor shaft end and pump shaft end.

Abstract: The present invention provides an electrical submersible pump assembly having a submersible pump, a submersible electrical motor drivingly connected to the pump, and a seal assembly disposed between the submersible pump and the motor. The seal assembly is generally of tubular construction and provides fluid communication between the seal assembly cavity and the motor, such fluid communication being in a circuitous path effecting gravity segregation of contaminants including particulate solids in wellbore fluids. The seal assembly thereby controls and minimizes migration of the contaminants into the body of the seal section and on into the motor.

Abstract: A centrifugal compressor that includes a low speed shaft connected to a drive motor and a high speed shaft containing an impeller. The high speed shaft is coupled to the low speed shaft by a gear train. The low speed shaft is supported by hydrodynamic, oil lubricated, bearings while the high speed shaft is supported by roller and ball bearings. Any vibrational stresses developed in the high speed shaft are dampened by the low shaft system through the gear train coupling.

Abstract: A liquid ring pump, includes a stationary housing having an interior space for accommodating at least one rotor mounted on a rotor shaft for rotation in the housing. The rotor shaft is supported by a bearing in the interior space, and the rotor is operated by a drive which acts on the outer perimeter of the rotor.

Abstract: Disclosed is a molten metal submersible pump system which includes a unitized body which acts as its own jig during assembly to precisely align the motor mount framework, the pump body, the pump base, and the pump shaft. Further disclosed is such a pump system which provides greater than normal surface area and heat sink mass, which has resulted in an increased useful life of the pump system between required maintenance and replacement of parts.

Abstract: An irrigation pump for use in irrigating small fields or supplementing larger irrigation systems can also be used for portable water supply for emergency, military, or for underdeveloped countries. The pump system is designed to be light-weight and semi-portable and can be powered with a small engine or electric motor. The apparatus uses a down well impeller that is driven by a flexible vertical shaft and a vertical shaft motor drive or engine. The pump impeller incorporates its own thrust and journal bearings for the pump shaft. The bearings are water lubricated. The main drive shaft is flexible and elongated and is supported over its entire length with a flexible shaft guide sleeve. The flexible drive shaft is surrounded by a convoluted well pipe so that the drive shaft and the well pipe can be removed from the well casing bore as a unit and then coiled for storage. The drive shaft accepts couplings at each end and a seal at its upper end.

Abstract: An irrigation pump for use in irrigating small fields or supplementing larger irrigation systems can also be used for portable water supply for emergency, military, or for underdeveloped countries. The pump system is designed to be light-weight and semi-portable and can be powered with a small engine or electric motor. The apparatus uses a down well impeller that is driven by a flexible vertical shaft and a vertical shaft motor drive or engine. The pump impeller incorporates its own thrust and journal bearings for the pump shaft. The bearings are water lubricated. The main drive shaft is flexible and elongated and is supported over its entire length with a flexible shaft guide sleeve. The flexible drive shaft is surrounded by a convoluted well pipe so that the drive shaft and the well pipe can be removed from the well casing bore as a unit and then coiled for storage. A flange on the outlet fitting can be used to bolt the entire assembly of engine and outlet fitting to the well head at a well casing flange.

Abstract: A system for pumping fluid from a well-bore that includes a pump assembly driven by a first motor module assembly via a continuous rotatable shaft. The first motor module assembly includes an induction motor having a multi-phase stator and a wound rotor. Energizing the stator of the induction motor of the first motor module induces a current in the windings of the wound rotor of the induction motor of the first motor module. The induced current is supplied to a motor coupling unit which generates power to drive a second motor module assembly electrically connected to the motor coupling unit. The second motor module assembly further drives the pump assembly via the continuous rotatable shaft.

Abstract: A liquid propellant supply system (10) according to the invention is electrical in nature and avoids the need for a gas generator and a turbine assembly. In particular, the system (10) includes an electrical power source (12), a controller (14) and a motor (18) for driving the pump (20). The electrical power source (12) provides electrical power sufficient for high power, limited duration applications such as for launch vehicle applications. For launch vehicle applications, the power source (12) is preferably capable of providing very high power for at least 60 seconds. A number of different types of electrical power sources may be employed in this regard. For example, the power source (12) may include high energy density batteries, supercapacitors, or counter rotating flywheels. Multiple counter rotating motors may be employed in order to minimize precessional forces.

Abstract: A well production apparatus includes a down-hole gear pump and a transport assembly to which the gear pump is attached. The transport assembly is formed from a string of modular pipe assemblies having one or more passages for carrying production fluid from the bottom of the well to the surface. The passages can be arranged in a side-by-side configuration, and include pressure and return lines for driving the gear pump. The gear pump includes a hydraulically driven motor that is ganged with a positive displacement gear set. Both the motor and the pumping section have ceramic wear surfaces, the ceramic being chosen to have coefficients of thermal expansion corresponding to the coefficients of thermal expansion of the gear sets. The pumps and rotors have ceramic bushings rather than ball or journal bearings, and are operable under abrasive conditions.