Abstract: An electric motor for powering downhole tools comprises a first stator (32) including a first set of coil windings (73), a second stator including a second set of windings, an axially located rotatable shaft (92) including a first magnetic element and a second magnetic element, a sealed annular chamber defined by a first tube (96), and an second tube concentrically inside the first tube. The first and second stators are located in the annular chamber, and the first magnetic elements being aligned with the first stator such that the first stator when energised can act upon the first magnetic element, and the second magnetic element being aligned with the second stator such that the second stator when energised can act upon the second magnetic element.

Abstract: In a pump having a rotor inside a pump chamber which is formed inside a case which is formed of a resin material, and a resin mold compound in which an armature is molded with resin, a metallic cover is provided on a portion of an outer surface of the case inside the pump, wherein the portion has inferior durability compared with the rest of the outer surface.

Abstract: A fuel pump includes a plurality of magnets that are disposed circumferentially on an inner surface of a housing of the fuel pump and alternately form different magnetic poles, an armature rotatably disposed inside the permanent magnets, a rotating member disposed on a rotary shaft that is connected with the armature and rotates with the rotary shaft by rotating the armature, a pump casing that accommodates and rotatably supports the rotating member, and a discharge port disposed on the pump casing so as to discharge fuel pressurized by the rotation of the rotating member. According to the present invention, an imaginary line extending straight through the discharge port in a flow direction of fuel discharging from the discharge port extends into a circumferential gap between two of said permanent magnets.

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: The present invention provides a submersible turbine pump (STP) comprising a check valve located within a hydraulics cavity, wherein the STP provides the ability to depressurize the hydraulics cavity by relieving a pressure differential between an inlet side and an outlet side of the check valve. In general, the STP is comprised of a casing body comprising a check valve extraction housing and the hydraulics cavity. The check valve is located within the hydraulics cavity and is comprised of a check valve stem, an inlet side, and an outlet side. The check valve extraction housing comprises a lock-down screw adapted to attach to the check valve stem and apply a force to the check valve to open the check valve, thereby relieving the pressure differential between the inlet side and the outlet side.

Abstract: A submersible water pump and a dewatering system comprising the submersible pump. The submersible water pump includes a housing and an outer tube. The housing includes a housing dividing wall and a cylinder head having a bore therethrough through which the outer tube fits. The housing is in slidable engagement with the outer tube and the housing dividing wall. The dewatering system with the submersible pump is used to pump water from vertical coal bed methane wells.

Abstract: A fuel pump includes a pump portion for pumping fuel. The fuel pump further includes a magnet having magnetic poles circumferentially alternate with each other. The fuel pump further includes an armature on a radially inside of the magnet. The armature includes a rotor core provided with a coil formed of a wire. The armature is rotatable for driving the pump portion. A commutator, which is in a substantially disc shape, is provided to an axial end of the armature for rectifying electricity supplying to the coil. The rotor core has an axial end having an outer circumferential periphery defining a commutator-side collar portion extending toward the commutator. The coil is formed by winding the wire between an outer circumferential periphery of the commutator and the commutator-side collar portion.

Abstract: A liquid delivery system includes a first reservoir having a first outlet through which liquid is delivered. A first delivery outlet is located at the lower portion of the first reservoir and a vent is included at its upper portion. A second reservoir located above the first reservoir and has a second outlet located in its lower portion. A first delivery conduit connects the second outlet to the first reservoir and a second delivery conduit connects the upper portion of the first reservoir with the upper portion of the interior of the second reservoir. A vent valve controls communication through the second delivery conduit. A level sensor senses the level of liquid in the first reservoir and causes the vent valve to open when the liquid falls below a first predetermined level and to close the vent valve when on the level rises above a second (higher) predetermined level.

Abstract: Upstream and downstream pump assemblies are mounted in a capsule having a bulkhead between the upstream and downstream pump assemblies, dividing the capsule into upstream and downstream chambers sealed from each other. In a dual operation mode, well fluid flows through the inlet of the capsule into the upstream chamber, where it is pumped to a first pressure level by the upstream pump assembly and discharged into the downstream chamber. The downstream pump assembly then pumps the well fluid to a second pressure level and discharges the well fluid out the outlet of the capsule. The assembly has also an upstream pump assembly only operational mode and a downstream pump assembly only operational mode.

Abstract: In a circumferential flow pump, a first groove sectional area (S1) of a feed passage at a pump cover side is set to be smaller than a second groove sectional area (S2) of a feed passage at a pump base side, whereby the diameter of an eddy flow occurring in the first groove sectional area (S1) is smaller than the diameter of an eddy flow occurring in the second groove sectional area (S2). Therefore, the fuel pressure of the feed passage at the pump cover side is set to be higher than that of the feed passage at the pump base side, and thus a vane wheel is formed to be pressed against the pump base side.

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: A pump includes a pump unit having an impeller for sucking and/or discharging liquid; a motor unit for driving the pump unit; a case for accommodating the pump unit; a partition plate for isolating the motor unit from the pump unit; and a mold resin integrally formed with the motor unit to protect the motor unit. Further, a bottom portion of a cylindrical portion projecting from the partition plate to the motor unit has a liquid-free surface having a convex spherical shape. Moreover, a method of manufacturing a pump, the method includes the steps of installing a partition plate at a lower half; installing a stator and a controlling part at the partition plate; closing the lower half with an upper half; curing resin after filling the resin into a cavity formed between the lower and the upper half; opening a mold; and extracting a molded motor product.

Abstract: A gas restrictor for an intake of a horizontally oriented submersible well pump has a tubular housing and a number of apertures. A sleeve is mounted within the housing for rotation relative to the housing. The sleeve has an axially extending row of slots. At least one weight in the sleeve causes the sleeve to rotate to a position with the row of slots at the bottom of the sleeve while the well pump is oriented horizontally. The slots and apertures are arranged so that regardless of the particular orientation of the housing relative to the sleeve, at least one of the apertures will be in registry with one of the slots.

Abstract: A liquid collection and disposal assembly for collecting and disposing of drainage liquid, the liquid collection and disposal assembly disposable in a pit and having a basin assembly with a collection cavity, a pump suspended in the collection cavity and a level detector to detect drainage liquid levels in the collection cavity. A controller responds to the level detector to activate the pump at predetermined levels of the drainage liquid to evacuate the drainage liquid. A transparent basin cover is supported on top of a basin member, and an effluent discharge pipe is connected to the basin cover and to a liquid outlet port of the pump, thereby supporting the pump a predetermined distance above the bottom of the collection cavity. The pump has a water jacket through which the discharging effluent passes to cool the motor.

Abstract: A submersible pump includes: a single phase motor having a drive shaft extending in the vertical direction; a pump assembly which is driven by the single phase motor; a motor casing in which the single phase motor is contained; an external casing in which the motor casing is inserted to form an annular channel between the external casing and the outer circumferential surface of the motor casing; and a capacitor. The capacitor is arranged on the side of the single phase motor in the motor casing.

Abstract: A motor includes a stator core, insulators, coils and a rotor. The stator core includes a plurality of coil cores, which are circumferentially arranged, wherein each of the plurality of coil cores includes a tooth that radially extends, and an outer peripheral core that circumferentially extends at a radially outer side of the tooth. Each of the insulators covers a corresponding one of the plurality of coil cores, wherein a part of each of the insulator is provided radially outward of an imaginary straight line, which connects circumferential ends of an inner peripheral surface of the outer peripheral core. Each of the coils is formed at the insulator. The rotor is rotatably provided to an inner peripheral side of the stator core.

Abstract: A water well pump is shown which uses regenerative turbine technology. A submersible electric motor has an output shaft which drives multi-stage regenerative turbine stages of the pump. The various stages are made up of turbine impellers separated by intermediate plates. The turbine impellers have peripheral vanes which cooperate with surrounding scraper rings to form flow channels through the regenerative section of the pump and impart energy to the water passing through the pump. The pump can be powered by a low energy source, such as a solar panel.

Abstract: A system and method for protecting a motor for a submersible pumping system. A variety of motor protectors are provided for application in variable temperature environments and multiple wellbore orientations. The motor protectors may include one or more of a positively pressurized bellows, a relatively balanced pressure bellows free of sliding seals, and a multi-orientable labyrinth. Each of these motor protectors also may have various moisture absorbents, filters, particle shedders and various conventional motor protector components.

Abstract: The brushless direct current motor comprises a housing 10, a stator 13 and a rotor 11 within the housing, windings on the stator, sensors for sensing the position of the rotor relative to the stator and electronic circuitry for switching the current in the windings in response to outputs from the sensors to cause the rotor to rotate relative to the stator. The sensors and at least a part of the electronic circuitry are encapsulated in an electrically insulating and fuel resistant material in a container within the housing.

Abstract: A device for conveying a liquid, in particular a cutting liquid from a machining operation containing production residues. The device includes a vertical pump having a pump housing (14), a pump impeller (13), a drive shaft (19) surrounded by a housing (18), an electric motor, and a shaft connection between the electric motor and the pump impeller (13). The pump housing (14) has an inlet opening (15) and a liquid delivery opening (16). When the pump is started, a negative pressure is generated in the housing (18) surrounding the drive shaft (19). The zone of negative pressure extends into the pump housing (14) through a gap (22) between the shaft (19) and the housing (18) and thus assures that fluid will be drawn into the pump even when the liquid level is extremely low.

Abstract: A submersible pump-motor assembly for use in dispensing petroleum from petroleum storage tanks. The pump-motor assembly of the present invention enhances the performance characteristics of the pump-motor assembly by providing greater flow area around the motor stator while maintaining the alignment of the assembly's critical pump components. Such enhanced pump performance characteristics provide the petroleum dispensing station manager using such pump-motor assemblies with greater flow rates per dispenser or, when maximum flow rates are capped, potentially greater dispensing capacity.

Abstract: A water supply system has its housing and pressure tank sized so that the pressure tank fits within the housing, thus avoiding the need for another separate opening in the ground for the pressure tank. With this arrangement, there is less work in installation of the system and in maintaining the system. A control box for the system can be in the housing near the top where it is accessible or it can be separate. Preferably, the pump will be driven by a variable speed pump or a stop cycle valve will be used. Preferably, the pressure tank has a capacity of less than 40 gallons and the housing has an enlarged portion and a reduced portion with the pressure tank being mounted within said enlarged portion of said housing.

Abstract: An end-wall unit for a submersible motor unit and a submersible motor unit for use in driving a pump including a housing that extends along a longitudinal axis and defines an interior chamber, a stator at least partially enclosed by said housing within a stator chamber, a rotor rotatably supported by a bearing assembly and at least partially enclosed by said stator, and an end-wall assembly that includes an end cap and at least one of a capacitor and a bearing assembly. The at least one of the capacitor and the bearing assembly is supported by the end cap in a position such that the at least one of the capacitor and the bearing assembly is at least partially enclosed by the housing when the end-wall assembly is installed on the motor unit.

Abstract: A submersible pumping system includes a pump assembly that is connected to a motor assembly. The pump assembly includes a pump intake having an intake hole, a pump housing connected to the pump intake and a pump discharge head connected to the pump housing. An intake seal device is connected to the pump intake and seals the pump intake prior to the initial use of the pump assembly. To further isolate the pump assembly while dormant, an outlet seal device can be fitted to the pump discharge head to isolate the pump assembly from the reservoir fluid in the production tubing.

Abstract: In a dipping type pump where a rotary shaft extending from a motor into a pump casing disposed in liquid is mounted with impellers, and liquid is sucked from a sucking port at a lower portion of the casing and discharged from a discharge port by rotational driving of the motor, where a check valve for air purge which allows outflow of gas from the interior of the casing but prevents outflow of liquid therefrom is provided at an upper portion of the casing.

Abstract: In a fan housing, a surrounding wall extends uprightly from an inner surface of a base wall that is formed with a wire hole. A power wire, which is coupled to a fan motor mounted on the inner surface, extends through the wire hole. A wire-positioning unit includes a first positioning groove formed in an outer surface of the base wall and extending from the wire hole to the surrounding wall, a second positioning groove formed in an outer surrounding surface of the surrounding wall and extending from the first positioning groove such that the power wire extends along the first and second positioning grooves, a first anchoring member for anchoring the power wire in the first positioning groove, and a second anchoring member for anchoring the power wire in the second positioning groove.

Abstract: A torque-generating apparatus includes a first assembly (10, 25) including a generally cylindrical member of magnetically soft material and having a longitudinal axis and a second assembly (2) arranged coaxially within the first assembly and including an electromagnetic winding (4). The first assembly (10, 25) and the second assembly (2) are rotatable relative to each other about the axis. Relative rotation between the first (10, 25) and second (2) assemblies induces a magnetic field which generates rotational torque between the first and second assemblies.

Abstract: A multi-fan assembly includes: a down rod assembly having a first end for fixing to a ceiling wall and having a second end provided with a canopy, a rotary assembly being fixed to a lower end of the down rod assembly and covered by the canopy. At both sides of the rotary assembly is provided with a fixed arm for connecting with a member fan respectively, a pair of vertical oscillating means are disposed between the fixed arm and the member fan, and a speed control device is mounted on the rotary assembly and then covered by the canopy of the down rod assembly.

Abstract: A multistage sealed pump is provided for use in an X-ray tube cooling system which is substantially more efficient than pumps of known construction and which provides substantially higher pumping pressure at lower motor current than conventionally. The pump employs multiple impellers which are plumbed in series and which are directly coupled to an electrical motor which with the impellers is submerged and runs in the coolant liquid. The impellers and motor are sealed within a housing and the pump unit is hermetically sealed, with no rotatable shaft seals being used or required. In one embodiment, the multistage pump employs a motor having oppositely extending motor shaft ends, with one or more impellers on each end of the motor shaft. The cooling liquid can be transferred from stage to stage by interconnecting tubing external of the housing or within the housing, through a hollow motor shaft, or through the motor casing.

Abstract: An electric fuel pump includes a pump proper (1) having a pump body (2) that includes an induction orifice (3), a delivery orifice (4), and electrical terminals (5,6). A cage (7) is arranged around said pump body. A filtering element (15) is connected to the cage and communicates with the induction orifice. A tubular vibration damping element (16) is arranged about the cage. A pump casing (17) is assembled about the vibration damping element so that the vibration damping element is disposed between the pump casing and the cage to prevent contact.

Abstract: A fuel pump includes a housing, a pump section, a motor section including a commutator, a cover disposed at one end of the housing, a pair of brushes disposed in a pair of brush holes formed in the cover to be in contact with the commutator; and a pair of brush springs, disposed in a pair of spring holes formed in the cover, and an engaging member for restricting the brushes to move toward the motor section.

Abstract: A liquid chemical metering pump (24) is described that can be fully submerged within a hazardous liquid chemical transport/storage container (28). The pump (24) includes a discharge adaptor (30) that can be received in the outlet aperture (40) of the container (28), in which it is held in sealing relationship by a suitable screw-threaded connector. The discharge adaptor (30) is provided with an intake port (32) in fluid communication with the liquid chemical in the container (28), and a discharge port (34) which is in fluid communication with a discharge tube (36) leading to a flow stream (38). The chemical metering pump (24) is remotely controlled by an electronic controller (26) connected by cable (25) to the chemical metering pump. The chemical metering pump (24) substantially eliminates the need for “double handling” of hazardous liquid chemical, as the chemical can be metered directly from the transport/storage containers in which it is delivered to the end user.

Abstract: The electrically motorized pump has a low energy loss because it uses of the shaft and the sleeve made from synthetic resin composition obtained by uniformly dispersing fine powder of RBC or CRBC in a resin. The typical process for the production of a synthetic resin composition for making the sleeve bearing for the pump for use in water includes kneading with a resin the fine powder of RBC or CRBC at a temperature in the neighborhood of the melting point of the resin, and thereby uniformly dispersing the fine powder of RBC or CRBC in the resin. Fibers, such as glass fibers, may be blended with the fine powder of RBC or CRBC and the resin.

Abstract: A method and apparatus suitable for coupling seismic or other downhole sensors to a borehole wall in high temperature and pressure environments. In one embodiment, one or more metal bellows mounted to a sensor module are inflated to clamp the sensor module within the borehole and couple an associated seismic sensor to a borehole wall. Once the sensing operation is complete, the bellows are deflated and the sensor module is unclamped by deflation of the metal bellows. In a further embodiment, a magnetic drive pump in a pump module is used to supply fluid pressure for inflating the metal bellows using borehole fluid or fluid from a reservoir. The pump includes a magnetic drive motor configured with a rotor assembly to be exposed to borehole fluid pressure including a rotatable armature for driving an impeller and an associated coil under control of electronics isolated from borehole pressure.

Abstract: A system and method for protecting a motor for a submersible pumping system. A variety of motor protectors are provided for application in variable temperature environments and multiple wellbore orientations. The motor protectors may include one or more of a positively pressurized bellows, a relatively balanced pressure bellows free of sliding seals, and a multi-orientable labyrinth. Each of these motor protectors also may have various moisture absorbents, filters, particle shedders and various conventional motor protector components.

Abstract: A centrifugal pump is provided for use with fluids, gases, and solids in connection with a drive shaft and a motor. The pump has a housing and a sloped impeller mounted on the shaft within the housing. The housing has opposing inlets on each side of the impeller and a discharge outlet. The impeller can be constructed as split through its center with an associated split housing or being an integral part.

Abstract: An oscillating arrangement for a multi-fan assembly includes a down rod assembly which is provided for connecting to a hanging assembly, on the hanging assembly is provided two sets of fixing arms which extend outwardly, two member fans are respectively mounted to the fixing arms of the hanging assembly, an end of a driving shaft of each member fan is provided with fan blades. The characteristic is that each set of the fixing arms is pivotally connected to an oscillating arrangement on which a member fan can be disposed. On the oscillating arrangement is further defined a gear cluster which is actuated by the member fan's motor, and a connecting assembly which is driven by the gear cluster. In this manner, the member fans are able to oscillate vertically.

Abstract: The present invention provides a high temperature pothead used to provide power to a submersible motor. More specifically, the present invention provides a high temperature pothead that does not require elastomeric sealing elements.

Abstract: An electrical cord entry system for a submersible pump. The cord entry system includes a receptacle assembly for providing unimpeded transmission of electrical power and/or electrical signals through a pump housing of the pump, and a connector assembly for interfacing with the receptacle assembly. The receptacle assembly includes a ground tab for engaging the pump housing to electrically ground the pump housing.

Abstract: A fuel pump is provided that is submersible within a fuel, for example, within a fuel tank of an automotive vehicle and is particularly suited for use with high alcohol content fuels that tend to contain ionic species. The fuel pump comprises an electric motor that includes a commutator and a negative brush electrode that is connected to a negative terminal of an external power supply. The electric motor is at least partially disposed within a metal shell that is in contact with the fuel. The metal shell is also connected to the negative terminal of the external power supply. During operation, a negative electrical potential is applied to the metal shell to preferentially react with ions within the fuel. In this manner, the metal shell serves as a anode to reduce the concentration of ionic species in the fuel, thereby decreasing reactions with the brush electrode and extending the useful life of the fuel pump.

Abstract: The present invention provides a submersible motor and pump system for use in a wellbore. More specifically, the present invention provides a submersible system having a sealed motor and a magnetic coupling to transmit torque from the sealed motor to the pump.

Abstract: A motor pump is provided in which the motor rotor is optimally force balanced for enhanced operation. The motor pump includes a pump head for pressurizing a fluid, and an electric motor drives the pump head. High pressure fluid is circulated through the motor air gap. The shaft of the motor rotor is axially movable with respect to the pump head such that the motor rotor is effectively floated in high pressure fluid as the fluid flows through the motor.

Abstract: An aquarium includes a pump disposed in a chamber of a container to circulate water and having a spindle. An air supplying device is coupled to the spindle of the pump and driven by the spindle of the pump, to pump air into the water contained in the chamber of the container. The pump may thus be used to pump or circulate the water in the aquarium, and to simultaneously supply air into the water contained in the aquarium. The air supplying device includes a valve housing having two check valve members disposed in a recess and a depression, and a membrane attached to the valve housing and forced by the pump to actuate the check valve members.

Abstract: A fuel supply unit 10 includes a fuel reservoir 22 for holding fuel, a fuel pump 18 within the reservoir for pumping fuel from the reservoir, a jet pump assembly 16 within the reservoir for drawing fuel from a fuel tank into the reservoir, and a gasket 24 operatively coupled with a portion of the jet pump assembly and disposed between the portion of the jet pump assembly and an interior surface of the reservoir so as to decouple the jet pump assembly from the reservoir.

Abstract: A multi-diameter bellows is provided in a seal section of a submersible pump to assist in allowing expansion of dielectric oil within the submersible pump, to equalize the casing annulus pressure with the internal dielectric motor fluid and to isolate the well fluid from the clean dielectric motor fluid. A shaft communicates the motor with the pump and runs through a bellows located in a bellows chamber in the seal section. The bellows is made of a first collapsible section and a second collapsible section. The first collapsible section has a fixed end at a first end of the bellows and has a first cross-sectional area. The second collapsible section has a fixed end at a second end of the bellows and has a second cross-sectional area. A first coupling member is provided between the first collapsible section and the second collapsible section. A volume within the bellows is varied by movement of the first coupling member towards either of the first end and the second end.

Abstract: A fuel pump has a pump housing that includes a cover having a face surface and a body having a face surface. An arcuate channel in defined in the face surfaces of the cover and the body. The arcuate channels extend at least partially circumferentially on the surfaces. An inlet opening extends through the cover and is coupled to the cover channel. An outlet opening extends through the body and is coupled to the body channel. An impeller is positioned between the face surface of the cover and the face surface of the body. At least one of the cover channel or the body channel has a cross-sectional shape along at least part of its length that includes a lower section and an upper section. The lower section has a semi-elliptical, partial semi-elliptical, or partial semi-circular shape, and the upper section has a pair of straight walls that are coupled to the lower section.

Abstract: The electrically motorized pump has a low energy loss because it uses of the shaft and the sleeve made from synthetic resin composition obtained by uniformly dispersing fine powder of RBC or CRBC in a resin. The typical process for the production of a synthetic resin composition for making the sleeve bearing for the pump for use in water includes kneading with a resin the fine powder of RBC or CRBC at a temperature in the neighborhood of the melting point of the resin, and thereby uniformly dispersing the fine powder of RBC or CRBC in the resin. Fibers, such as glass fibers, may be blended with the fine powder of RBC or CRBC and the resin.

Abstract: The unit includes an electric drive motor (12) and a pump section (24) that are situated next to each other in a common housing (10) designed at least nearly in the shape of a hollow cylinder. The pump section (24) comprises a delivery element (26) rotating in a pump chamber (30), and one wall (32, 34) each forms a boundary of the pump chamber (30) with the drive motor (12) and with the outside of the housing (10) in the direction of the axis of rotation (28) of the delivery element (26). The walls (34) forming the boundary of the pump chamber (30) with the outside of the housing (10) is formed as a single component with the housing (10), and the walls (32) forming the boundary of the pump chamber (30) with the drive motor (12) is inserted into the housing (10) as a separate component.

Abstract: A device for transmitting motion between the rotor of a synchronous permanent-magnet motor and the working part, having an increased free rotation angle, which comprises at least two motion transmission couplings which mutually cooperate in a kinematic series. Each coupling is constituted by at least one driving element which is eccentric with respect to the rotation axis and is rigidly coupled to a first component of the motion transmission system and by at least one driven element, which is also eccentric with respect to the rotation axis and is rigidly coupled to the component arranged kinematically after the preceding one. The angle covered by the elements of each coupling is, as a whole, less than a round angle. The intermediate components of the kinematic transmission have both a driven element and a driving element for receiving the motion from the preceding one and transmitting it to a subsequent one.