Abstract: The invention relates to an internal gear pump for delivering fuel in an internal combustion engine, with an internally toothed annular gear and an externally toothed pinion that cooperates with the annular gear to produce a pumping action. In order to increase both the delivery capacity at starting speed and the service life of the internal gear pump, the pinion is supported on a supporting stub in a radially mobile fashion, eccentric to the annular gear. In addition, a device is provided to compensate for the radial play between the pinion and the annular gear. The drive is transmitted by a spring-loaded Oldham coupling, which adjusts the axial play of the pump according to the invention.

Abstract: A motor-pump unit is provided that has at least two internal gearwheel pumps axially aligned that are driven off of the rotor of the electric motor. The rotor of the electric motor is U-shaped and is concentrically disposed about the pump. The web of the U-shape is disposed in the region of the rotational axis with internal toothing that meshes with pinions of the at least two internal gearwheel pumps.

Abstract: A multistage gear pump for pressurizing fluid includes a housing, a drive shaft and a gear assembly. The drive shaft is rotatably supported in the housing. The gear assembly is disposed in the housing. The gear assembly includes at least first and second gear trains. Each train has a pair of drive and driven gears that are engaged with each other. The drive gear is provided on the drive shaft and followed by the driven gear. The first gear train and the second gear train are arranged so that fluid sequentially passes therethrough as the drive shaft rotates. A theoretical discharge capacity of the first gear train is larger than that of the second gear train.

Abstract: An electric pump draws and discharges fluid. When the fluid receives heat from the pump, the fluid has a saturation vapor pressure that can surpass the pressure of fluid that is drawn into the pump and is lower than the pressure of fluid discharged from the pump. The pump includes an electric motor; a pump section that is driven by the electric motor to draw, pressurize, and discharge the fluid; and a housing for accommodating the pump section. The housing defines a motor chamber that accommodates the electric motor. The pressure in the motor chamber is equal to the pressure of fluid that is discharged from the pump section. Therefore, the pump prevents fluid in the motor chamber from vaporizing.

Abstract: A two-stage gear pump has a pump section. The pump section has an internal space that is located adjacent to a driven gear and about a cylindrical surface of the driven shaft. A discharge section of a first gear train is connected to a suction section of a second gear train with a communication passage. The internal space is connected to the communication passage with a pressure introduction passage. The pressure of the communication passage is introduced to the internal space by the pressure introduction passage, so that the pressure atmosphere of the internal space is an intermediate pressure atmosphere of the suction pressure and the discharge pressure of the pump section.

Abstract: To counter downstream oil infiltration through a shaft seal, a small portion of the compressed fluid is diverted from downstream to upstream through a passageway in a rotor. The diverted fluid is introduced to a space at a downstream side of the seal. An exemplary implementation is in a compressor having a central male rotor intermeshed with a pair of female rotors. The seal is located at an upstream (inlet) end of the lobed working portion of the male rotor.

Abstract: The present invention provides a multi-stage vacuum pump which includes: a housing in which a plurality of pumping chambers are formed, the pumping chambers being arranged in series and being in fluid communication with one another, one of the pumping chambers which is at one end of the series acting as an initial stage pumping chamber, another of the pumping chamber which is at the other end of the series acting as a final stage pumping chamber, the housing being provided with an inlet port for sucking a gas from a space to be evacuated into the initial stage pumping chamber, the housing being provided with an outlet port for exhausting the gas from the final stage pumping chamber; a Roots-type pump section occupying each of the pumping chambers; and a device for decreasing a temperature differential between the initial stage pumping chamber and the final stage pumping chamber.

Abstract: The invention relates to improvements in compressors and in particular to arrangements for driving screw compressors by reluctance drive motors. A screw compressor assembly is provided for compressed gas comprising a screw compressor having a casing (16) and at least one pair of intermeshing helically formed screw rotors (11,12) each of which is mounted on a rotor shaft rotatably mounted within the casing by means of bearings (15). Said assembly further comprises a switched reluctance motor comprising a stator (18) attached to the casing and a rotor (19) mounted on one of the motor shafts such that one of the screw rotors is driven directly by the motor.

Abstract: A multishaft electric motor has a plurality of juxtaposed rotors having respective permanent magnets disposed therearound, and a plurality of sets of armature elements disposed fully circumferentially around the rotors, respectively, the permanent magnets of adjacent two of the rotors having a plurality of pairs of unlike magnetic poles for magnetically coupling the rotors through the armature elements between the permanent magnets. A positive-displacement vacuum pump includes a casing, a pair of pump rotors rotatably disposed in the casing in confronting relation to each other, and a two-shaft electric motor coupled to the pump rotors for rotating the pump rotors in opposite directions. The two-shaft electric motor may comprise a pair of juxtaposed rotors and a pair of sets of armature elements disposed fully circumferentially around the rotors, respectively.

Abstract: A multi-stage internal gear fuel pump for a vehicle includes a housing having an inlet and an outlet and a motor disposed in the housing. The multi-stage internal gear fuel pump also includes a shaft extending axially and disposed in the housing for rotation by the motor. The multi-stage internal gear fuel pump further includes a plurality of pumping modules disposed axially along the shaft and each having an internal gear and an external gear cooperating with each other for rotation by the motor to pump fuel from the inlet to the outlet.

Abstract: The invention relates to a water-injected screw compressor, comprising a compressor element (2) with a housing (7) which borders a compression chamber (8) in which two rotors (9, 10) are installed, which, by means of an axle ends (13, 14; 15, 16), are borne in the housing (7) by means of water-lubricated slide bearings (1), an electric motor (3) comprising a housing (18) which carries a stator (19) at the inside, which stator surrounds a rotor (21) with a rotor shaft (22). An axle end (13) of one of the rotors (9) is directly coupled to or forms one piece with the rotor shaft (22) of the motor (3), said rotor shaft being located in the prolongation of said axle end. The rotor shaft (22) of the motor (3) is borne in at least one water-lubricated slide bearing (23).

Abstract: An automatic colorant dispenser having a compact modular design incorporating simply installed, precision stepper-motor driven, colorant pump modules, specifically designed to provide maximum abrasion resistance using advanced aerospace technologies plus exceptional operational life utilizing high quality, high precision and high reliability mechanical and electrical components. By employing advanced performance materials and space saving, compact geometric and ergonomic design methodology in the fully modular automatic colorant dispenser, up to sixteen space saving, two gallon colorant canister modules are efficiently grouped and directly connected to their respective energy-saving colorant pump modules. All component modules have been ergonomically located behind large open access panels to ultimately maintain the system with maximum convenience and simplicity.

Abstract: A dual fluid pump assembly driven by respective shafts of a dual balancing shaft assembly for an engine of an automotive vehicle. A shaft housing rotatably supports primary and secondary balancing shafts of the dual balancing shaft assembly. The shafts are coupled by a gear train for rotating the primary and secondary balance shafts in opposite directions. Each shaft includes a distal end for supporting and driving a fluid pump. A pump housing is fixedly secured to the shaft housing for enclosing the fluid pump and retaining fluid therebetween. The pumps are disposed adjacent the shaft housing and within a seal formed by the shaft housing and pump housing.

Abstract: The compressor has two rotors (14, 16), which are rotatably mounted in a housing (10) by means of a shaft each, the rotors (14, 16) rotating without contact with the housing. The rotors (14, 16) consist of a powder-metallurgical Al—Si alloy, and the housing (10) consists essentially of aluminum.

Abstract: In order to improve a refrigerant compressor comprising an overall casing, an electric motor disposed in the overall casing with a stator and a rotor which is mounted on a drive shaft, and also a screw compressor disposed in the overall casing, one compressor screw of which is mounted on the drive shaft, which is rotatably mounted in the overall casing by a first radial bearing between the rotor and the compressor screw and a second radial bearing disposed on a side of the compressor screw lying opposite the first radial bearing, in such a way that the risk of the stator being touched by the rotor no longer occurs, it is proposed that the drive shaft is mounted in the overall casing by a third radial bearing which is disposed on a side of the rotor lying opposite the first radial bearing, and that a drive portion of the drive shaft which extends between the first radial bearing and the third radial bearing is formed in such a way as to compensate for alignment errors between the three radial bearings.

Abstract: An internal gear pump including a stepper motor coupled to a drive shaft that is coupled to a rotor and meshed with an idler is disclosed. A controller is linked to the stepper motor. The stepper motor imparts a stepped rotational movement to the drive shaft wherein a single 360° rotation of the drive shaft comprises a plurality of steps. The controller sends a signal to the stepper motor to rotate the drive shaft a predetermined number of steps, based upon an inputted dispense amount. The signal causes the stepper motor to rotate the drive shaft a predetermined number of steps. The controller calculates the predetermined number of steps based upon the inputted dispense amount using an algorithm that is derived experimentally that defines a relationship between dispense amount and the number of steps required for each dispense amount. The algorithm is unique for each fluid to be pumped.

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

Abstract: The invention concerns a pumping unit wherein the vacuum pump (100) is driven by a motor (3, 4) comprised in a common monobloc housing forming motor housing (5) and oil pan (18) containing a gear assembly (17) for coupling two parallel pump rotors (14). To complement the sealing conditions provided by a dynamic seal (6), the motor stator (4) consists of an electric coil embedded in an oil-tight and gas-tight resin, thereby not requiring other more expensive and bulky sealing means, reducing production cost and enhancing the pumping unit dependability.

Abstract: A refrigerant pump includes a thin-walled hermetic vessel and a thick-walled hermetic vessel having an end inserted into and secured to an end of the thin-walled hermetic vessel. A stator of an electric motor unit is fitted outside the thin-walled hermetic vessel, while a rotor of the electric motor unit is accommodated inside the thin-walled hermetic vessel. A pump mechanism is fitted inside the thick-walled hermetic vessel, and a rotational force of the rotor is transmitted to the pump mechanism by the drive shaft.

Abstract: A screw compressor includes a compressor main body, a male rotor having a screw-like male tooth shape and a female rotor having a screw-like female tooth shape meshing with the screw-like male tooth shape or the male rotor. The male and female motors are provided within the compressor main body. A motor casing is operably connected to the compressor main body, and a high speed electric motor provided within the motor casing. The motor includes a motor rotor, a motor stator and a motor shaft for driving at least one of the male and female rotors. A speed ratio of the motor shaft and the at least one of the male and female rotors driven by the motor shaft is in a range of 2:1 to 1:2.

Abstract: The invention relates to a vacuum pump (1) comprising a pump chamber casing (5) accommodating two co-operating rotors (2, 3) which are respectively arranged on a shaft (8, 9); a bearing/gear chamber (6) adjacent to the pump chamber casing (5) in which the rotor shafts (8, 9) are cantilevered and provided with a synchronisation gear (17); a drive motor (25) whose drive shaft (28) extends parallel to the rotor shafts (8, 9) and is provided with a drive gear (35); also comprising a gear stage (37) between the drive shaft (28) and one of the rotor shafts (8, 9). In order to provide a machine of this type which can be embodied in a compact form, the drive gear (35) of the drive shaft (28) engages directly with a driven gear (36) on one of the rotor shafts (8, 9), forming the gear stage (37).

Abstract: An internal gear pump including a stepper motor coupled to a drive shaft that is coupled to a rotor and meshed with an idler is disclosed. A controller is linked to the stepper motor. The stepper motor imparts a stepped rotational movement to the drive shaft wherein a single 360° rotation of the drive shaft comprises a plurality of steps. The controller sends a signal to the stepper motor to rotate the drive shaft a predetermined number of steps, based upon an inputted dispense amount. The signal causes the stepper motor to rotate the drive shaft a predetermined number of steps. The controller calculates the predetermined number of steps based upon the inputted dispense amount using an algorithm that is derived experimentally that defines a relationship between dispense amount and the number of steps required for each dispense amount. The algorithm is unique for each fluid to be pumped.

Abstract: Gear pumps are disclosed having a gear-assembly section, a drive-assembly section, and at least one passage fluidly connecting the gear-assembly and drive-assembly sections, wherein the passage includes substantially non-movable walls defining a non-linear fluid-flow path. A particular example is a magnetic gear pump having a gear-assembly section; a section that includes a magnet assembly received in a cup cavity; and a third section located between the gear-assembly and magnet-assembly sections, wherein the third section includes a fluid-input port, a fluid-output port, and at least one conduit for fluidly interconnecting the gear-assembly and magnet-assembly sections; and a member defining at least one non-linear passage in fluid connection with the third section conduit and the cup cavity.

Abstract: A screw compressor having balanced axial thrust includes a housing having a fluid inlet and a fluid outlet; a rotor disposed in the housing for receiving low pressure fluid from the inlet and discharging increased pressure fluid from the outlet, the rotor having a discharge end and a motor end; a balance piston arranged to exert a balancing force on the motor end of the rotor; and a conduit for conveying a high pressure fluid to the balance piston so as to exert the balancing force.

Abstract: A motor driven pump comprises a motor stator (30), a motor rotor (10) operable to rotate around the outside of the stator (30) and a pump mechanism (40, 50) driven by the motor rotor (10) and disposed at least partly inside the motor stator (30).

Abstract: A housing for a screw compressor, includes a single-piece casting defining a motor housing section and a rotor housing section and has an inlet for compressor medium, an outlet end and a bridge member disposed between the motor housing section and the rotor housing section and defining an inlet side bearing housing; a discharge housing mounted to the outlet end and defining an outlet and a discharge side bearing housing; and at least one rotor disposed in the rotor housing section and rotatably mounted between the inlet side bearing housing and the discharge side bearing housing.

Abstract: A displacement machine for compressible media includes at least two shafts. Each of the shafts has a rotor which is configured as a profiled body with the profiles of the rotors engaging one another in the manner of gearwheels during rotation and running without contact relative to one another. Each of the shafts is driven by an electric motor. The angular positions of each shaft is determined by an associated synchro resolver. Each of the synchro resolvers has a rotor and emits an electronic signal to the electric motor of the shaft such that the motors are electronically synchronized. Each of the shafts further has a gearwheel, with the gearwheels engaging one another and having an angular clearance which is smaller than that of the profiled bodies. At least one of the gearwheels is directly connected to the rotor of the synchro resolver associated with its shaft and both gearwheels together are releasably connected as a unit to the shaft.

Abstract: A multishaft electric motor has a plurality of juxtaposed rotors having respective permanent magnets disposed therearound, and a plurality of sets of armature elements disposed fully circumferentially around the rotors, respectively, the permanent magnets of adjacent two of the rotors having a plurality of pairs of unlike magnetic poles for magnetically coupling the rotors through the armature elements between the permanent magnets. A positive-displacement vacuum pump includes a casing, a pair of pump rotors rotatably disposed in the casing in confronting relation to each other, and a two-shaft electric motor coupled to the pump rotors for rotating the pump rotors in opposite directions. The two-shaft electric motor may comprise a pair of juxtaposed rotors and a pair of sets of armature elements disposed fully circumferentially around the rotors, respectively.

Abstract: A pump and motor unit 100 and method for pumping fluids is provided. The pump and motor unit 100 comprises a pair of rotors 102 and 104 encased by a stator casing 106. Fluid is pumped into and out of the pump and motor unit 100 as the rotors 102 and 104 are rotated. The stator casing 106 seals the fluid around the rotors 102 and 104 and further generates a revolving magnetic field which rotates the rotors 102 and 104. The magnetic field may be generated by single phase current or by multiphase current. Both, or one, of the rotors 102 and 104 may be driven by the magnetic field. Rotors which are being driven are preferably fabricated from an iron-based material. Rotors which are not being driven are preferably fabricated from a non-magnetic material, such as carbon-nylon. Alternatively, the rotors 102 and 104 may comprise, at least in part, a permanent magnet material with brushless direct current motor technology being used to rotate the rotors.

Abstract: A lubricating oil supplying arrangement for an apparatus having a rotating apparatus shaft with an oil pump is arranged at one end of the apparatus shaft (23) and is driven by this apparatus shaft (23). A pump housing (2) has a pocket (3) in the form of a chamber open on one side, in which two co-operating displacement elements (4,5) are so arranged that the pump housing (2) covers the displacement elements (4,5) axially on both sides at least in an operative region and in the circumferential direction over a maximum of 180°. The displacement elements (4,5) are held in position by a pump shaft (13). This pump shaft (13) is connected via coupling elements to the apparatus shaft (23) so that they rotate together. This permits a construction having narrow tolerances that is easy to assemble.

Abstract: An oil free screw compressor includes a compressor main body directly connected to a high speed motor via a drive side gear and a driven side gear having a uniform speed ratio. A bearing in a side of the high speed motor employs one having the same size as that of a bearing in a side of the compressor main body. The same material as a viscous seal provided at both end portions of a male rotor and a female rotor is used for a viscous seal provided at both end portions of a motor shaft. The high speed motor is driven by a high frequency type inverter. The electric motor side and the compressor main body side are made in a rotational shaft structure which is dummy symmetrical about a uniform gear portion.

Abstract: A vacuum pumping apparatus includes a pump housing 1 and a motor housing 8. The housings 1 and 8 are fastened together so as to be a sealed structure by O-rings 51-58 interposed therebetween. A shaft 17 of a driving device 70 and a driving shaft 15 carrying a rotor 2a are detachably connected via a coupling 91. During operation of the apparatus, a rotor chamber 41 in the pump housing 1 and a motor chamber 43 in the motor housing 8 are equalized in pressure, which requires no mechanical seal therebetween. The coupling 91 facilitates easy removal or detachment of a motor part B from a pump part A, which results in convenient maintenance of the pump part A.

Abstract: The invention concerns a pumping unit wherein the vacuum pump (100) is driven by a motor (3, 4) comprised in a common monobloc housing forming motor housing (5) and oil pan (18) containing a gear assembly (17) for coupling two parallel pump rotors (14). To complement the sealing conditions provided by a dynamic seal (6), the motor stator (4) consists of an electric coil embedded in an oil-tight and gas-tight resin, thereby not requiring other more expensive and bulky sealing means, reducing production cost and enhancing the pumping unit dependability.

Abstract: A multishaft electric motor has a plurality of juxtaposed rotors having respective permanent magnets disposed therearound, and a plurality of sets of armature elements disposed fully circumferentially around the rotors, respectively, the permanent magnets of adjacent two of the rotors having a plurality of pairs of unlike magnetic poles for magnetically coupling the rotors through the armature elements between the permanent magnets. A positive-displacement vacuum pump includes a casing, a pair of pump rotors rotatably disposed in the casing in confronting relation to each other, and a two-shaft electric motor coupled to the pump rotors for rotating the pump rotors in opposite directions. The two-shaft electric motor may comprise a pair of juxtaposed rotors and a pair of sets of armature elements disposed fully circumferentially around the rotors, respectively.

Abstract: A screw compressor has an electric motor having a given longitudinal axis, and two intermeshing rotors; the electric motor having an output shaft also defining the output shaft of that of the two rotors which is coaxial to the longitudinal axis of the electric motor.

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

Abstract: The invention herein is a ventricular assistive device (VAD) based on a progressive cavity pump. A progressive cavity pump does not use blades or fins to propel the blood. Instead, the pump stator and rotor are designed so that, when combined, there are a series of cavities formed between the pump rotor and the stator wall. Blood is carried through the pump chamber in these cavities when the rotor rotates. In the preferred embodiment of the invention, the cavities progress on a straight line path through the pump, providing an efficient and unobstructed channel for blood flow and minimizing the risk of thrombus.

Abstract: The rotary piston machine with an axial direction of delivery from the top downwards, in particular of screw spindle-type construction, with cooling ducts (12) for the motors (8), bearings (7) and sensors (9), through which ducts a cooling fluid flows, and with a cooling device for the pump space (3) is characterized in that the casing (2) of the pump space (3) has a closed annular space (15) which is partially filled with a liquid, which is cooled by the cooling fluid via heat exchanger surfaces (18).

Abstract: The hydraulic pump, in particular the hydraulic pump of an electro-pump unit, of a type comprising a pump body enclosing a gear pump and provided with a suction aperture for aspirating a low pressure liquid and an outlet chamber for driving back a high pressure liquid, which communicates with a high pressure outlet channel connected to a user hydraulic circuit, and a hydraulic capacity for dampening of pulses generated by the pump and equipped with deaerating means for a draining of air able to be trapped therein, the deaerating means being formed by the high pressure liquid that is driven by the pump back into the outlet channel.

Abstract: A compact, electronically operated, rotary positive displacement pumping device having a stator which functions as an electric motor stator and also as pump stator, a rotor or rotors which function as electric motor rotor or rotors and also as pump rotor or rotors, and a highly efficient and effective magnetic flux path which has low reluctance, said flux path being used in a magnetic drive arrangement to impart rotation to the rotor or rotors to create a pumping action.

Abstract: A compact, electronically operated, rotary positive displacement pumping device having a stator which functions as an electric motor stator and also as pump stator, a rotor or rotors which function as electric motor rotor or rotors and also as pump rotor or rotors, and a highly efficient and effective magnetic flux path which has low reluctance, said flux path being used in a magnetic drive arrangement to impart rotation to the rotor or rotors to create a pumping action.

Abstract: A multirotor vacuum pump including a housing, at least two rotors located in the housing and cooperating with each other so that as a result of a contactless movement of the at least two rotors relative to each other, working chambers, into which a to-be-pumped gas is fed, are formed, with at least one of the at least two rotors being hollow, and a drive formed as an external rotor motor having its rotor elements arranged on an inner surface of the at least two rotors, and stator elements fixedly mounted inside the at least one of the at least two rotors opposite the rotor elements.

Abstract: A screw pump, includes a pump case having a fluid inlet, a pumping chamber, and a fluid discharge with at least two intermeshed parallel screw members rotatably mounted therein and in fluid communication with the fluid inlet and the fluid discharge. One synchronous electric drive motor mounted to each screw member provides the driving power to the screws. Electronic controls are provided for sensing the rotary positions of the motors for synchronizing rotation of the screw members. The pump is also capable of pumping multi-phase fluids.

Abstract: A multishaft electric motor has a plurality of juxtaposed rotors having respective permanent magnets disposed therearound, and a plurality of sets of armature elements disposed fully circumferentially around the rotors, respectively, the permanent magnets of adjacent two of the rotors having a plurality of pairs of unlike magnetic poles for magnetically coupling the rotors through the armature elements between the permanent magnets. A positive-displacement vacuum pump includes a casing, a pair of pump rotors rotatably disposed in the casing in confronting relation to each other, and a two-shaft electric motor coupled to the pump rotors for rotating the pump rotors in opposite directions. The two-shaft electric motor may comprise a pair of juxtaposed rotors and a pair of sets of armature elements disposed fully circumferentially around the rotors, respectively.

Abstract: A power transfer pump includes a rotary pump disposed within connected body sections comprising a top body, a main body with two ports and a cylindrical chamber to house a rotary assembly, a supporting body fitted with a connecting head, and a mounting body. The mounting body has a flexible ring, a bolt and forms a drive motor chamber with the supporting body to receive and clamp a power source that engages with the rotary assembly to activate the pump. The power transfer pump integrates into an oil removal station whereby by means of the rotary pump assembly, an oil sucking and discharging effect is created.

Abstract: Pinion and ring gears intermeshed at one location within a pump chamber are rotationally supported therein by a cylindrical bearing portion of a housing sealingly enclosing said pump chamber between side plates of the housing within which stator windings are mounted in operative alignment with permanent magnets carried in one of the gears acting as a motor rotor as a result of interaction between such magnets and magnetic fields produced by electrical input power fed to the stator windings.