Abstract: In centrifugal pumps and, in particular, pumps for transferring fluids containing abrasive particles such as slurry pumps, wear of wetted areas is a major maintenance issue. The invention provides for the protection of internal surfaces vulnerable to wear from such particles by providing means for adjusting and controlling distribution of gland fluid for flushing vulnerable areas. The invention extends to a method and a retrofit kit, but provides primarily for a centrifugal pump assembly comprising an impeller rotatably mounted therein and support means operatively arranged for supporting the impeller from its suction side in sealing relationship with the housing. The sealing means may be mechanically adjustable for substantially even distribution of gland fluid to both axial sides of the impeller in the pump housing.

Abstract: A centrifugal compressor includes a housing 20 having a facing surface 22f facing the outer peripheral surface of a cover 43, a seal member 50 forming a clearance with the outer peripheral surface of the cover 43, an inclined hole 55 formed in the seal member 50, extending at an angle to the side opposite to a direction of rotation, and having an opening portion 57 opening at a position facing the outer peripheral surface of the cover 43, a first fin 52 provided on the seal member 50 and protruding toward the outer peripheral surface of the cover 43, and a communication flow path portion 64 formed in the housing 20, having an introduction port 66i opening at a position facing the outer peripheral surface of the cover 43, and communicating with the inclined hole 55.

Abstract: A pump for conveying a highly viscous fluid includes a casing with at least a first inlet and an outlet for the fluid, and an impeller for conveying the fluid from the inlet to the outlet. The impeller is arranged on a rotatable shaft for rotation around an axial direction, and includes a front shroud facing the first inlet of the pump. The casing includes a stationary impeller opening for receiving the front shroud of the impeller and has a diameter. The front shroud and the stationary impeller opening form a gap having a width in a radial direction perpendicular to the axial direction, and the ratio of the width of the gap and the diameter of the impeller opening is at least 0.0045.

Abstract: A centrifugal compressor to be used in a chiller system includes a casing, an impeller, a motor and a diffuser. The casing has an inlet portion and an outlet portion. The impeller is attached to a shaft rotatable about a rotation axis, and has an impeller shroud which encloses the impeller. The motor rotates the shaft in order to rotate the impeller. The diffuser is disposed in the outlet portion downstream of the impeller. The centrifugal compressor further includes a seal bearing. The seal bearing is attached to the inlet portion to seal the impeller shroud, and rotatably supports the impeller and the shaft.

Abstract: Extracorporeal circuit devices can be used for on-pump open-heart surgery to support surgical procedures such as coronary artery bypass grafting. In some cases, a centrifugal pump is used as part of an extracorporeal circuit. Centrifugal pump heads are described herein that induce flow on two sides of an impeller plate, and that can be conveniently mechanically assembled.

Abstract: A centrifugal compressor includes a flow changing groove that is formed on an inner wall of the suction passage and extends in a rotation direction of the compressor wheel. A boundary part of a groove wall of the flow changing groove and the inner wall of the suction passage includes an upstream boundary part positioned on an upstream side in the circulation direction of the gas, and a downstream boundary part positioned on a downstream side in the circulation direction. The upstream boundary part is positioned on the inner side in a radial direction of the compressor wheel than the downstream boundary part, and the flow changing groove is positioned on the upstream side of the wheel in the circulation direction.

Abstract: A motorized pump assembly includes a pump and a motor for driving the pump. The pump includes a pump housing that at least in part defines a pump chamber. The motor includes a stator, a rotor rotatable about an axis, a motor housing, and a bearing assembly. The rotor includes a motor shaft extending along the axis. The motor housing includes an endshield that at least in part defines a motor chamber in which the stator and the rotor are at least substantially received. The bearing assembly rotatably supports the motor shaft on the endshield. The pump housing and the endshield are fixed to one another and cooperatively at least in part define an overflow chamber adjacent the pump chamber. The endshield defines a drainage channel fluidly interconnected with the overflow chamber and configured to direct fluid from the overflow chamber away from the bearing assembly.

Abstract: A liquid pump includes a motor and an impeller. The motor includes a stator, a rotor, a base body and a shaft sleeve unit supporting the rotor for rotation. The shaft sleeve unit includes a fixing member fixed in the base body, a bearing received in the fixing member and surrounding the rotary shaft, and a resilient buffering member disposed between the fixing member and the bearing. The impeller is coupled to the rotor.

Abstract: A centrifugal blower unit for motor vehicle air conditioning systems having a fan wheel (8) in a spiral housing (1), wherein the spiral housing (1) corresponds to the shape of the fan wheel (8) and has a bell mouth region (3) and an axial intake opening (2), wherein a diaphragm (4) is arranged at the bell mouth region (3) of the spiral housing (1), being radially inward, whose diaphragm end region (5) bordering the intake opening (2) has at least one sharp edge.

Abstract: A compressor is provided. The compressor includes a rotating member configured to rotate about an axis and a static member radially adjacent the rotating member with a clearance between the static member and the rotating member. A first groove is disposed circumferentially about the static member and radially adjacent the rotating member. A second groove is disposed circumferentially about the static member and a first axial distance aft of the first groove. A third groove is disposed circumferentially about the static member and a second distance aft of the second groove, wherein the first distance is different from the second distances.

Abstract: A centrifugal fan may include an impeller arranged to rotate about a rotation axis, an impeller case arranged to accommodate the impeller, a motor arranged to rotate the impeller, and a motor case arranged to accommodate the motor. The impeller may include a boss portion joined to a shaft arranged to rotate about the rotation axis, a hub arranged to extend radially outward from the boss portion, and a plurality of blades. Each blade may be arranged to extend radially outward. An inner wall of the impeller case may include an inside surface extending radially outward along an upper end portion of each blade. A side end portion of an air inlet defined in a central portion of the impeller case may include a curved surface projecting radially inward.

Abstract: A pump intake device comprises a main body which includes a side wall section having an inner side and an outer side, an intake section extending from the outer side of the side wall section and an intake passage extending through the intake section, the intake passage having an inner surface and an entry end and an exit end with a central axis extending between the entry and exit ends, where a first portion of the inner surface has one or more first guides thereon for directing fluid passing through the intake passage so that, in use, the fluid leaves the exit end at the first portion with an exit angle which is inclined relative to the central axis.

Abstract: A centrifugal pump with a cutter mechanism has a toothed cutter auger affixed to an impeller, and a toothed cutter stator affixed to the volute casing. The auger is a rotor cutter preferably profiled radially to match the inlet geometry of the impeller vanes while extending along its central axis towards the pump suction. The auger is preferably radially concentric to the impeller and includes vanes numbered preferably to match the number of vanes on the impeller. The auger is affixed to the impeller, preferably with a lockscrew threaded into a common pump shaft. The radial profile of the auger essentially makes a continuous vane with the impeller, and prevents solids from hanging on the inlet vane tip or center void while providing a smooth flow transition into the impeller.

Abstract: A seal body for use with a torque tube includes a first portion having an attachment mechanism to releasably secure a torque tube to the first portion, and a second portion configured adjacent to the first portion. The second portion of the seal body includes a substantially uniplanar sealing surface that is orthogonal to an axis of rotation of the torque tube, and that extends across a substantially uniplanar axial end face of the torque tube.

Abstract: The invention relates to a rotation device, such as a pump or a hydromotor of the rotating type, wherein a rotation-symmetrical rotor bounds at least two rotor channels together with radial baffles. The rotor comprises two generally goblet-shaped dishes, the innermost dish of which is stiffened by a first stiffening plate which has a peripheral widening, for instance branches in its peripheral zone into at least two rings which are rigidly connected with at least two respective bent peripheral edges, substantially over the whole outer surfaces thereof, to the inner surface of the peripheral edge of the relevant dish such that the stiffness of the peripheral edge of the dish is increased.

Abstract: A fluid machine has a housing and a rotating portion that rotates relative to and is at least partially disposed within the housing. The housing is coupled to a seal assembly comprising a plurality of seal channels having a plurality of seal rings. Each of the plurality of seal channels comprises a respective one of the plurality of seal rings.

Abstract: A centrifugal pump includes at least one impeller (4) and at least one sealing arrangement arranged between the impeller (4) and a housing wall. The sealing arrangement seals a suction side of the impeller (4) with respect to a pressure side of the impeller (4). The sealing arrangement including a seal (12) fastened on the impeller (4) in a rotationally fixed manner.

Abstract: A method and device for reducing wear in a water turbine (1) comprising a turbine housing (2) and an impeller (4), and where between the turbine housing (2) and the impeller (4) is arranged a seal (16, 18), and where the method comprises supplying cleaned water to the seal (16, 18).

Abstract: Systems and methods for improving seal performance in a centrifugal water pump for an internal combustion engine increase static pressure at the seal by incorporating a combination of slots and ribs into a seal cavity of the pump housing that are positioned to convert dynamic fluid pressure into static pressure at the seal while reducing coolant velocity at the seal. Vent holes in the impeller having an appropriate size and location may also be used to increase the static pressure at the seal to enhance seal performance.

Abstract: In a pump arrangement, each adjusting screw has first and second end portions, a third intermediate raised portion, and a fourth portion to allow each adjusting screw to be rotated clockwise/counterclockwise. Each first end portion passes through a suction liner aperture so left-handed threads couple to a respective left-handed seal ring aperture. Each second portion passes through a suction half casing aperture so the fourth portion can be accessed to allow clockwise/counterclockwise rotation of each adjusting screw. Each adjusting screw rotates clockwise and moves until the third portion pushes against the suction half casing, so the screw stops moving and the seal ring moves away from the suction liner as the screw is rotated clockwise, or rotates counterclockwise and moves until the third portion pushes against the suction liner, so the screw stops moving and the seal ring moves towards the suction liner as the screw is rotated counterclockwise.

Abstract: A food centrifugal pump formed by stamping and welding, comprising a pump casing and a cover mounted therein, an impeller, a shaft and a motor provided on the outer side of the casing, wherein the impeller is mounted on the shaft and driven to rotate by the motor; the pump casing is provided with an inlet pipe and an outlet pipe; the impeller have a structure of half-opened type and consists of blades, a hub and a back cover plate, the front end of the blade is close to the inner side of the axial plane of the pump casing, and there is an end face seal formed therebetween; the pump casing is formed by stamping a single metal plate, the outer side of the axial plane of which is provided with an inlet pipe bracket used to support the inlet pipe, the end of which is connected to the outer side of the pump casing, the other end of which is nestedly connected to the inlet pipe and fixed thereon.

Abstract: A self-monitoring adjustment system is provided for evaluating and effecting adjustment of the leakage restricting mechanism between the rotating and non-rotating elements of a rotodynamic pump to restrict leakage and to establish desired gap dimensions between the rotating and non-rotating elements of the pump. The adjustment system is structured to be self-monitoring for determination of when an adjustment of the leakage restricting mechanism is warranted by the conditions of the pump, and is structured with adjusting mechanisms that are self-adjusting responsive to the monitored conditions of the pump, though manual adjustment is also enabled.

Abstract: The present invention relates to a centrifugal pump for pumping of liquids containing pollutions mainly in the form of solid particles, which pump comprises a drive unit, a hydraulic unit, whereby the hydraulic unit comprises a pump housing (20) and a pump impeller (12) rotationally arranged inside the housing, the pump impeller comprising an upper (14) and a lower (16) cover disc and a number of intermediate vanes (18). The invention is characterised in that a bottom wall (22) of the pump housing, having a central inlet opening (24), is arranged with at least one spirally extending back flow affecting means (32, 34) on the side facing the lower cover disc extending parts of or full turns around the inlet opening.

Abstract: A pump system having a pump module (10) comprising a stator housing (28) with a chamber (30), a rotor (32) rotatably and axially slidably received in the chamber and comprising a first axial extension (46) with a liquid supply channel (50) and a second axial extension with a liquid supply channel (52), the first and second axial extensions having different diameters, and first and second sealing rings (54, 56), mounted around the first and second axial extensions.

Abstract: A seal mechanism (10) can reduce noise during operation. The seal mechanism (10) is used for a fluid machine (P) to prevent a fluid from leaking out of a high-pressure space (H) into a low-pressure space (L) in the fluid machine (P). The seal mechanism (10) has an annular seal member (12) movable in a radial direction and a housing (11) disposed between a body (23) of the fluid machine (P) and a rotatable member (22) located inside the body (23) of the fluid machine (P) so as to receive the annular seal member (12). The annular seal member (12) has a first surface (12a) on a side of the low-pressure space (L) in the fluid machine (P). The housing (11) has a second surface (11c) facing the first surface (12a) of the annular seal member (12). The seal mechanism (10) has one or more passages (15) formed in the first surface (12a) and/or the second surface (11c).

Abstract: A device for application in a fan configuration is configured, in particular, to be directly driven by an electric motor. In the fan configuration, a centrifugal fan wheel is mounted to rotate in unison with a drive shaft. The centrifugal fan wheel, for producing a directed airflow, is surrounded by a fan housing. A seal is disposed in an admission orifice, for largely filling in an air gap between the centrifugal fan wheel and the inner surface of the fan housing. Such a configuration improves the housing and sealing thereof for an application in a vacuum cleaner by having the sealing device be embodied as a sealing ring linked to a buffer part out of the fan housing, which part tightly surrounds the admission orifice.

Abstract: Disclosed is a diverter for directing particles that cause wear in a slurry pump away from the stationary face of a slurry pump. The diverter comprises a protrusion that directs particles back into the collector of the pump to reduce the number of particles that go through the impeller nose gap. The protrusion extends from the suction liner face to the front shroud whereby particles can be deflected away from the suction liner face.

Abstract: An impeller for use in a centrifugal pump, the impeller including a shroud having opposed faces, an outer peripheral edge portion and a rotation axis, a plurality of pumping vanes on one of the faces of the shroud and extending away from the rotation axis, each pumping vane having an outer peripheral edge portion, and a plurality of auxiliary vanes on the other face of the shroud, the auxiliary vanes of each having an outer edge portion wherein the dimension Da from the rotation axis to the outer peripheral edge portion of the shroud is greater than the dimension Db from the rotation axis to the outer edge portion of the auxiliary vanes.

Abstract: A radial seal is provided for installation within a centrifugal pump of the type having an impeller, a pump casing having a suction inlet, a sealing ring groove formed in the pump casing, and means for supplying flushing water to the sealing ring groove. The radial seal comprises a seal body, including a sealing end, a water inlet end, and opposed sides. The sealing end has an outwardly extending lip portion. The seal is adapted for installation within the sealing ring groove, with openings formed through the seal body for the passage of water.

Abstract: A device for application in a fan configuration is configured, in particular, to be directly driven by an electric motor. In the fan configuration, a centrifugal fan wheel is mounted to rotate in unison with a drive shaft. The centrifugal fan wheel, for producing a directed airflow, is surrounded by a fan housing. A seal is disposed in an admission orifice, for largely filling in an air gap between the centrifugal fan wheel and the inner surface of the fan housing. Such a configuration improves the housing and sealing thereof for an application in a vacuum cleaner by having the sealing device be embodied as a sealing ring linked to a buffer part out of the fan housing, which part tightly surrounds the admission orifice.

Abstract: A friction regenerative pump of this invention comprises: a partition portion formed in a section from a high-pressure outlet to a low-pressure intake along an impeller rotation direction; and a tongue portion provided in the partition portion such that it is elastically deformable. The tongue portion receives a back pressure from high-pressure fluid on the side of the high-pressure outlet and is elastically deformed in a direction of reducing a gap formed between the tongue portion and the outer peripheral portion of an impeller. Consequently, leakage of the high-pressure fluid from the high-pressure outlet to the low-pressure intake is reduced, thereby improving pump efficiency.

Abstract: A set of seals is installed on the impeller of a centrifugal pump that allows a low viscosity fluid to be injected into a chamber between the impeller shroud and the casing sidewall. A seal ring, with a number of grooves formed in it is installed on the tip of the impeller. Another seal ring is mounted at the leading edge of the eye of the impeller. The gas is picked up by the grooves in the impeller tip ring inside diameter and is compressed by centrifugal force to a higher pressure than the discharge pressure of the impeller. It is then injected into the pumpage stream. The eye ring seals have pockets or grooves and inject gas at a low volume into the eye of the impeller.

Abstract: Electronic system components are cooled using a field configurable pump comprising a selectable plurality of identical or nearly identical modular pump units. The pump units are disposed in a stacked arrangement and are fluidly connected to adjacent modular pump units via a removable coupling, preferably one of the quick-disconnect variety. Each modular pump unit comprises a housing, an impeller and a sealing mechanism. When disposed in a stack the combined pump structure is driven by a single motor. In this fashion, pump structures may be employed which are adaptable to heat flux demands imposed by the electronic components.

Abstract: A seal for use in a centrifugal pump of the type used for pumping an abrasive slurry, and having a sealing ring groove formed in the pump casing and an arrangement for supplying flushing water, comprising a radial seal having a sealing end, a water receiving end, and opposed sides and adapted for installation within the sealing ring groove, the radial seal having multiple openings formed therethrough for the passage of flushing water. The openings are dimensioned and located so that when flushing water is supplied to the water receiving end of the radial seal, the water flows through the openings, causing the radial seal to automatically moves to a self-compensating balanced position between the pump casing and a rotating pump impeller. This will reduce leakage between the pump casing and pump impeller and reduce wear of the pump surfaces.

Abstract: An improved vacuum motor air intake for use on vacuum motor device with a funnel shaped shroud enclosing a portion of the vacuum motor housing adjacent a fan assembly. Combined with the funnel shaped shroud, a conical air deflection body directs air entering the motor in a laminar flow pattern.

Abstract: A seal arrangement for an impeller assembly, the impeller assembly including an impeller housing (34) adapted to receive a drive shaft. An impeller (10) is located within the impeller housing (34) and is adapted for connection to the drive shaft for rotation by the drive shaft about an axis. The seal arrangement includes an annular seal (24) located axially between the impeller housing (34) and the impeller (10) to provide a substantially fluid tight seal between the impeller housing (34) and the impeller (10).

Abstract: In a pair of wearing rings, the inner-cylinder wearing ring (5a, 5b) or the outer-cylinder wearing ring (4a, 4b) is formed of a carbon fiber reinforced plastic and constituted so that the coefficient of thermal expansion in the radial direction is −1×10−6/° C. to 30×10−6/° C. This makes it possible to maintain a clearance between the case wearing ring and the impeller wearing ring within a small fixed range even when the temperature rises due to rotation and when a high-temperature fluid is used. A pump provided with the wearing ring is excellent in stability and has a good efficiency.

Abstract: Self-supporting wear rings (1a, 1b) for fluid flow machines are arranged at a radial sealing gap (18) to a rotor (9), and have an outer jacket surface (3) provided with a wear surface (2). The wear rings (1a, 1b), which are fixed in the axial direction, consist of a material with lower thermal expansion coefficients than their support and lie hollowly on their inner jacket surface, with a first conical holder surface (8) encountering with the apex of its cone a second holder surface (8″), which is designed as a straight shoulder, in the plane of the latter (19) on the axis of rotation or encountering a second holder surface, which is designed as a conical holder surface (8′), at its cone apex on the axis of rotation (20).

Abstract: A fan assembly with an improved seal for a mobile machine cooling system is disclosed. A housing is mounted to a machine structure and an impeller is mounted for rotation with respect to the housing. The impeller includes a plurality of rotating blades supported on a flange. A fan inlet is mounted with the housing and directs air toward the blades. A rotating shroud extends outwardly from the impeller flange and has a shroud inlet that extends into the fan inlet to form a seal between the fan inlet and the shroud inlet. The method and apparatus includes forming the seal between the fan inlet and the rotating shroud to prevent leakage as the rotating blades generate a centrifugal airflow for discharge through a fan outlet.

Abstract: A bypass motor assembly includes a motor having a rotatable shaft, a working air fan secured to the rotatable shaft and a shroud having an intake eyelet and at least one exhaust apertures. The assembly includes an end bracket having a shaft hole through which the shaft extends. The end bracket and the shroud partially enclose the working air fan, wherein rotation of the working air fan draws air in through the intake eyelet and pushes the air through the plurality of exhaust apertures, the end bracket having a plurality of vanes that form a fan chamber that receives the working air fan such that air expelled by the working air fan is efficiently re-directed by the vanes toward the exhaust aperture. An air intake seal can be disposed between the shroud and the working air fan to further enhance the working air flow.

Abstract: An improved pump shell for a multistage metal working pump includes a plurality of pump shell units housed in series within a hollow cylindrical casing and has the impellers driven by a shaft. Each pump shell unit has a inner shell which forms a holding end at one side and a sealing flange at another side. The holding end of one pump shell may align and engage precisely and easily with the sealing flange of an adjacent pump shell unit to form a smooth fluid passage from the inlet of the impeller through the inner shell so that pumping efficiency may be enhanced with less turbulence. The sealing flange, holding end and the casing also form a close annular compartment for holding a seal ring inside to provide effective sealing function. The pump shell may be produced by stamping at low cost.

Abstract: In a fluid machine such as multistage centrifugal compressor, the pressure of a working fluid is raised with the rotation of a impeller. A shaft sealing device is mounted at the end of the rotary shaft in order to prevent the working gas of the raised pressure from leaking out of the fluid machine and then polluting the surroundings. In a case where the fluid machine operates to rotate at high speed, a labyrinth sealing device is employed for the purpose of reducing a frictional loss in the shaft sealing device. The labyrinth sealing device includes a plurality of stages of labyrinth fins which are formed on a casing or the rotary shaft, and a layer of abradable coating to-be-bitten which is formed in the surface part of the rotary shaft or the casing opposing to the labyrinth fins. The clearances between the labyrinth fins and the rotary shaft or the casing are made narrower on the low-pressure side of the labyrinth sealing device than on the high-pressure side thereof.

Abstract: A seal gas pressure booster system for use with a gas compressor, particularly of the type used for boosting pressure in gas transmission, process or utility industries and which contains pressure about the shaft/casing interface with the use of dry gas seals. Seal supply gas is supplied from the discharge side of the compressor. During normal operation, sufficient head across the compressor exists to supply the necessary flow of seal supply gas against the restrictions provided by the filters, interconnections and components in the seal gas supply system. During startup, or during modes of operation where sufficient head across the compressor does not exist, the pressure booster system increases the pressure of a stream of compressor discharge gas to provide the necessary pressure differential to supply the dry gas seal with a continuous flow of clean, filtered gas.

Abstract: A pump includes a front casing and a rear casing for defining a space therebetween. An end of the shaft extends into the space with an impeller is supported by a bushing which makes the impeller is rotatable in the space. A wearing ring is attached to a front side of the impeller. The front casing defines a bore in which a buffer is received so as to be axially movable with respect thereto. A thrust ring is attached to the buffer for contactingly engaging the wearing ring whereby when the impeller rotates, the axial movement of the buffer maintains a fluid film between the thrust ring and the wearing ring. An O-ring is mounted to the buffer for providing a buffer function between the buffer and the bore thereby helping maintaining the fluid film.

Abstract: In a fluid machine such as multistage centrifugal compressor, the pressure of a working fluid is raised with the rotation of a impeller. A shaft sealing device is mounted at the end of the rotary shaft in order to prevent the working gas of the raised pressure from leaking out of the fluid machine and then polluting the surroundings. In a case where the fluid machine operates to rotate at high speed, a labyrinth sealing device is employed for the purpose of reducing a frictional loss in the shaft sealing device. The labyrinth sealing device includes a plurality of stages of labyrinth fins which are formed on a casing or the rotary shaft, and a layer of abradable coating to-be-bitten which is formed in the surface part of the rotary shaft or the casing opposing to the labyrinth fins. The clearances between the labyrinth fins and the rotary shaft or the casing are made narrower on the low-pressure side of the labyrinth sealing device than on the high-pressure side thereof.

Abstract: A water pump for an internal combustion engine having a pump casing and a pump cover that forms a circulation cavity. A plate is positioned interface of the pump casing and the pump cover and divides the circulation cavity into an inlet passage and an outlet passage and has a seal portion that seals against the leakage between the inlet passage and the outlet passage of a gap of the interface of the pump casing and the pump cover.

Abstract: A sheet metal casing for multistage pump and its manufacturing method, the casing includes an outer shell and an inner shell. The outer shell is integrally formed and includes a front end ring, a step positioning ring, an outer shell surface and a positioning end. The inner shell is fixed to the inner side of the outer shell and includes an inner end, an inner shell surface and a step positioning rim. The step positioning rim forms a closed holding space with the outer shell surface for holding and squeezing a seal ring therein. When a plurality of casings being serially mounted on a spindle, the positioning end of a front casing may make contact with the step positioning ring of a rear casing, and the positioning rim of the front inner shell may make contact with the front end ring of the rear outer shell for axially positioning the casings on the spindle.

Abstract: Shown with the invention are self-supporting wear rings (1a, 1b) for flow machines with a fluid, which are arranged at a radial sealing gap (18) to a rotor (9), and of which the outer jacket surface (3) is provided with a wear surface (2). The wear rings (1a, 1b), which are fixed in the axial direction, consist of a material with lower thermal expansion coefficients than their support and lie hollowly on their inner jacket surface, with a first conical holder surface (8) encountering with the apex of its cone a second holder surface (8″), which is designed as straight shoulder, in the plane of the latter (19) on the axis of rotation or encountering a second holder surface, which is designed as a conical holder surface (8′), at its cone apex on the axis of rotation (20).

Abstract: A molten metal impeller having a base portion including a circumferential notch. The notch having a generally radial wall and a generally axial wall, at least one of the radial or axial walls including a plurality of grooves. A ceramic bearing ring is cemented into the notch.

Abstract: An pump casing for a sheet metal pump includes a pump body made by pressing or roll forming a sheet metal, a reinforced member which includes a water guide unit and a flange unit separately made by casting or CNC machining and a seal ring engaged with the water guide unit. The pump body is a simple basin shape which can be produced with less stress concentration. The water guide unit may be made with a more precise volute for achieving better pumping efficiency. The reinforced member may increase structural strength of the pump casing for withstanding greater pumping pressure and external forces. The seal ring may be positioned precisely without dislocation because it engages with the water guide unit rather than the pump casing. The gap between the seal ring and the impeller may be kept small and constant, thus obtaining better pumping efficiency, lower operation noise and greater durability.