Abstract: The invention relates to a radial fan impeller (1), in particular for using in gas fans with a steep fan characteristic curve, with the following features: with a plurality of blades (2) distributed around the periphery; viewed in the radial direction, the blades (2) extend from an inner inlet region (4) to an outer discharge region (6); the blades (2) extend axially, i.e.

Abstract: The invention relates to an impeller device (10) for centrifugal fans (1), comprising a centre wheel (40), at least one side disc (20, 30) and fan blades (50). The invention is characterised in that the centre wheel (40) and the side disc(s) (20, 30) are equipped with attachment devices (24, 44) for attaching the blades and the centre wheel's (40) attachment device (44) comprises a protrusion (45) extending substantially in the centre wheel's radial direction and arranged to abut against the second side end (54) in the fan blades (50).

Abstract: An apparatus that is rotatable around a first axis to propel an intercepted fluid in a radial direction. The apparatus has a support capable of being rotated around the first axis, a first blade assembly, and a second blade assembly. The first blade assembly has a first blade with a first substantially flat surface residing in a first plane that is substantially parallel to the first axis. The second blade assembly has second and third blades respectively having second and third substantially flat surfaces residing respectively in second and third planes, each extending substantially parallel to the first axis with the second blade assembly in an operative position on the support. A single piece defines at least a part of the second and third substantially flat surfaces.

Abstract: The invention refers to an impeller, consisting of plastic, which Is intended for a coolant pump of an internal combustion engine. The impeller, which has a multipart construction, comprises a back wall, which is connected in one piece to guide vanes and also to a hub, and also a separate molded disk which on the end face partially covers the guide vanes in the installed state. The components, the back wall and the molded disk are positionally fixed by means of a materially bonding connection.

Abstract: A fan motor having a small thickness and its impeller's blades formed to have a longer length in the diametrical direction than a width in the axial direction. Since the blade of the fan motor has a tooth structure or chamfers at its edge end in the diametrical direction, turbulence is forcibly evoked in an airflow to promote the turbulent diffusion, thereby suppressing the trailing vortex and reducing the aerodynamic noises, and thus the ventilation efficiency is improved.

Abstract: A turbofan integrally formed with a shroud and a method of manufacturing the same. The turbofan includes a rotating plate rotated by a driving motor, a plurality of blades having first ends connected to an outer peripheral portion of a front surface of the rotating plate while being arranged in a radial pattern, a shroud having an annular shape and being integrally formed with second ends of the blades, in which the shroud has an inner diameter equal to or larger than a diameter of the rotating plate, and an auxiliary rotating plate having a diameter larger than the diameter of the rotating plate and being fixed to the rotating plate. Since the inner diameter of the shroud is equal to or larger than the rotating plate, the turbofan is integrally formed with the shroud by a mold.

Abstract: A cooling fan for rotating machine having a sufficient cooling performance, mass production performance and easiness in mounting is provided.

Abstract: An impeller for a pump, particularly for a cooling water pump of an internal combustion engine, includes a hub (11), a cover disc (14) which is disposed on the intake side and is provided with a central opening (15) for sucking in a conveyed medium, and at least one blade (13) that is connected to the cover disc (14) located on the intake side so as to form a single piece therewith and is provided with an inner section (13a) located in the region of the central opening and an outer section (13b) located in the region of the cover disc (14). The impeller achieves a high degree of efficiency yet is easily produced by embodying the impeller (5) in a completely open manner on the pressure side lying opposite the cover disc (14) and by configuring the inner section (13a) of the blade (13) in a three-dimensionally bent manner while configuring the outer section (13b) thereof in an essentially two-dimensionally bent manner.

Abstract: A pump includes a housing defining an internal chamber having an axial inlet passage, a generally radial passage with an outlet to a volute. A rotatable impeller, disposed within the chamber, has a conical rear shroud sloping away from the axial inlet to define a rear recess. A shaft seal is disposed within the recess to minimize the axial length of the pump. A front surface of the shroud carries vanes operable to impel fluid from the axial inlet passage to the volute. Portions of the vanes extend forward into the axial inlet passage to induce coolant pre-rotation in the inlet passage and to improve pump efficiency. Pump efficiency may be further increased by a conical wall defining the axial inlet passage, a sloped wall defining the radial passage and a large radius between the axial inlet and the sloped wall to smooth fluid flow between the axial inlet passage and the volute.

Abstract: An integrated centrifugal blower wheel for a heating, ventilation and air conditioning (HVAC) blower unit includes a first blade support, a second blade support, and a plurality of S-shaped blades disposed between the first and second blade supports, wherein each of the S-shaped blades has a trailing edge bent in a forward direction with respect to a defined direction of rotation of the wheel.

Abstract: Apparatus 10 discloses a submersible hydraulic powered pump for removing matter such as liquid, abrasive particulate, slurries or mixtures 12, from a sump or container. The pump has a housing 14 with an integral stand 16 projecting therefrom comprised of a plurality of legs extending to a base plate that will keep the pump spaced away from the ground and gauge the size of matter 56 allowed to enter the pump. Positioned within the housing base is an ingress aperture serving as the intake 50 for flowable matter into a chamber having an impeller assembly 52 driven by a hydraulically powered motor 18. The impeller assembly 52 comprises a plurality of perforated plates and an impeller plate 38 that allows for the release of trapped air through the impeller assembly's apertures at 46 to prevent the buildup of air and unwanted pressure gaps within the pumping lines also known as “air lock.

Abstract: A turbine wheel for driving rapidly rotating tools, in the form of a circular disk or ring, configured for mounting so as to be rotatable about an axis. Disposed thereon in circular formation are turbine blades having axially parallel front and back faces curved in the radial direction. The front face has a lesser radius of curvature (R3, R4), at least in portions, than the back face. This feature allows the turbine wheel to fit into the conventional turbine housings without relatively major redesign and with, at most, slight modifications. The turbine wheel can achieve higher torque than previous turbine wheels at the required high rotational speeds. Thus, a greater quantity of material can be applied to the spraying dome or a spraying disk without a detrimental braking. Surfaces to be sprayed can be provided with a uniform coat of material in shorter time.

Abstract: A Francis runner that includes a crown, a band and blades which extend between the crown and the band. An angle (?24) between a linear speed (U, D224) of one of the blades and a median of the blade at the trailing edge, has a value between 20 and 25°. As a result, a machine utilizing the Francis runner of the invention is efficient, while an equivalent power under high load is high.

Abstract: A Francis turbine with an improved shape of blades, which can reduce cavitations generated on the surface of the blades or reduce the secondary flow around the blades, is provided. A Francis turbine comprises a rotating shaft, a crown, a plurality of blades, and a band. The crown can rotate with the rotating shaft. The blades are circumferentially arranged on the crown, each of which including an inner end as a trailing edge. The band is coaxially coupled with the crown by the blades. The rotating shaft, the crown, the blades, and the band as a whole rotate toward a turbine direction during a turbine operation. A projected profile of the trailing edge on a perpendicular plane, which is perpendicular to a center axis of the rotating shaft, is curved toward a direction opposite to the turbine direction at least in the crown side.

Abstract: A Francis turbine with an improved shape of blades, which can reduce a circumferential velocity component generated in the flow downstream of the blades in a condition of a partial load operation, or reduce the secondary flow around the blades, is provided. A Francis turbine comprises a crown, a plurality of blades, and a band. The crown can rotate around a rotating axis. The blades are circumferentially arranged on the crown, each of which including an inner end as a trailing edge. The band is coaxially coupled with the crown by the blades. A distance Rc can be defined as a distance between the rotation axis and an end by the crown side of the trailing edge. A distance Rb can be defined as a distance between the rotation axis and an end by the band side of the trailing edge. The distance Rc and the distance Rb satisfy 0.2 ? R c R b ? 0.4 .

Abstract: A centrifugal impeller particularly for a turbo-charger includes a circular disc member, a boss portion formed at a central portion of the disc member and having a central through hole into which a rotational shaft is inserted, an impeller blade integrally formed on one surface side of the disc member, and a ring-shaped rib member arranged on the other surface side of the disc member so as to be coaxial with a center axis of the boss portion. A thickness reduced portion is formed to the disc member so as to have a thickness smaller than that of another portion of the disc member, and the thickness reduced portion is arranged adjacent to the rib member.

Abstract: The invention is a fan for an alternator adapted to be coupled in rotation to the alternator rotor, and being of the type comprising a wheel part and a plurality of fan blades (47, 48) extending from the latter, the fan being moulded in a plastics material on an insert (50) which is preferably of metal and which constitutes the wheel part of the fan and is arranged to provide fastening of the fan on the rotor, being configured so as to constitute a means for increasing the mechanical strenght of the fan; the insert (50, 65) includes at least a portion of a blade (48, 69) of the fan. The invention is useful in the manufacture of a high power cooling fan for a motor vehicle alternator.

Abstract: A rotor and an apparatus including a rotor are provided. For example, the apparatus can be a turbine or compressor having a housing in which the rotor rotates while gas is circulated therethrough. The rotor has a plurality of radially extending blades, and each blade defines a nonlinear profile along at least one edge so that the strains induced in the blade during operation are reduced. A method for manufacturing such a rotor is also provided.

Abstract: A molten metal pump system which includes a particle relief passageway between the vanes on the impeller and the pump base, the particle relief passageway being a predetermined size to allow particles of a predetermined size to pass between the plurality of vanes and the interior walls of the impeller aperture of the pump base. Part or all of the particle relief passageway may, but need not, be as a result of a shoulder on the radially outward end of the plurality of vanes in the inlet side of the impeller.

Abstract: A Francis turbine with a improved shape of blades to reduce the secondary flow around the blades and improve the hydraulic efficiency is provided. A Francis turbine comprises a rotating shaft, a crown, a plurality of blades and a band. The band is coaxially coupled with the crown by the blades and the rotating shaft, the crown, the blades, and the band as a whole are driven by water and rotate toward a turbine direction during a turbine operation. On a leading edge of at least one of the blades, a local maximum point exists between the crown and the band. The leading edge leans toward the turbine direction from the band connecting point, where the band and the leading edge are connected. And, a circumferential distance in the rotating direction between the band connecting point and the leading edge is the largest at the local maximum point.

Abstract: In a radial fan wheel for supplying cooling air for an electrical machine, with a number of fan blades (16) attached along the circumference of the fan wheel (10) that have arc-shaped blade ends (18), which, at their radially inner edge, enclose a first angle (?1) with a tangent (20) to the inner circumference (20) of the fan wheel (10) and at their radially outer edge, enclose a second angle (?2) with a tangent (22) to the outer circumference (24) of the fan wheel (10), the invention proposes that the second angle (?2) be selected to be 75% or more greater than the first angle (?1) in order to minimize the turbulence noise in the vicinity of the fan blades (16) during operation of the fan wheel (10).

Abstract: A pump impeller for use in industrial pumps of the centrifugal type is disclosed in which the vanes of the pump impeller are particularly configured to maintain pumping efficiency as the vane wears over continuous use or operation of the pump. The impeller vane is configured to continuously present an aggressive cutting surface at the leading edge of the vane even though the vane may become degraded and worn through continuous use.

Abstract: The present invention provides a centrifugal fan including a hub adapted for rotation about a central axis and a plurality of blades arranged about the central axis and coupled for rotation with the hub. Each of the blades includes a curvature in a plane that extends through the blade and is tangent to a cylinder which extends through the blade and is centered along the central axis.

Abstract: It is the object of the present invention to provide a centrifugal blower fan capable of reducing a noise in an operating rotational speed range without degradation in blàwer performance. A centrifugal blower fan comprises a base plate, and a plurality of fan blades arranged on the base plate in a radial pattern to define a plurality of air passages between the pairs of adjacent fan blades, respectively. A portion of the base plate serving as a bottom wall of each of the air passages is formed with a plurality of through-holes.

Abstract: A method of manufacturing a turbofan, which facilitates a manufacturing process and reduces a defective fraction of products during the manufacturing process by providing joining portions of the turbofan with corresponding plane surfaces. The turbofan includes a rotating plate coupled at a center thereof to a shaft of a drive motor, a plurality of blades radially arranged on a peripheral area of a front face of the rotating plate, and a ring-shaped shroud coupled to front ends of the plurality of blades. The method includes forming the ring-shaped shroud and first parts of the plurality of blades integrally, forming the rotating plate and remaining second parts of the plurality of blades integrally, and joining the first parts to corresponding second parts by fusion bonding.

Abstract: A fan penetration fixture consisting of a threaded shaft and a lock nut design. The fixture is designed to take the place of the fan clutch on a fan drive assembly in the vehicle being tested for a desired cooling system performance characteristic at each possible fan penetration. The threaded shaft portion of the fixture bolts to the fan hub. The desired fan is then bolted to the lock nut portion of the fixture. The lock nut can be positioned at any point along the threaded shaft to achieve a desired fan penetration.

Abstract: A trailing edge of a turbine rotor blade is formed so that a deflection angle of a blade surface in a downstream side of a maximum blade thickness portion is a predetermined value or less, by forming the trailing edge of the rotor blade so as to be inclined from a center line of a blade thickness toward an extension line of a suction surface. Since the trailing edge of the rotor blade is thus formed, a rapid increase of the deflection angle is prevented in a trailing edge portion of the rotor blade. Accordingly, a rapid ascent portion and a rapid deceleration portion are not generated in a suction surface velocity in a main stream unlike the conventional case.

Abstract: A blower includes a blower housing having a chamber, an impeller rotatably received in the chamber, the impeller having a plurality of blades; and at least one resonator ring associated with one of the blower housing and the impeller. The resonator ring provides a plurality of resonator cavities for absorbing noise generated by the plurality of blades. The blower housing has an inlet opening and an outlet opening associated with the chamber; and a baffle assembly sub-dividing at least one of the inlet and the outlet openings.

Abstract: A back-to-back double-flow bi-directional thrust-balanced micro-impeller for use in optimized compression cycles of small volumetric flow rates is provided. The back-to-back micro-impeller is a component of a compressor capable of generating a pressure head suitable for maintaining the flow rate needed for dissipating heat, such as produced by an electronic component. The back-to-back micro-impeller provides a fluid path on both sides of the micro-impeller, imparting an equal momentum (or velocity) to the fluid. The left and right compressor sections provide a balancing of forces generated by high-pressure fluid against the two sides of the micro-impeller. This reduces vibrational forces and provides a balancing force on the shaft which reduces the thrust on the shaft in a direction away from the gas flow path. Also, the approximately equally distributed mass about the rotation axis X, provides for a balanced impeller which is desirable when operated at high rotation speeds.

Abstract: Methods of producing impeller castings from very hard materials are disclosed in which the formation of a selectively configured core produces an impeller casting that does not need to be machined to receive the drive shaft and eliminates the need for employing a lead babbitt or soft insert, as is known in the prior art, to receive the drive shaft, thereby producing a hard material impeller for a centrifugal pump that is significantly less costly to produce and is environmentally safe.

Abstract: In a centrifugal blower, a casing forms a scroll duct on the outer periphery of a centrifugal fan. The scroll duct includes a motor scroll duct wall extending from the periphery of a motor casing wall in a radial direction, a suction scroll duct wall extending from the periphery of a suction casing wall in an axial direction, and an outer peripheral wall smoothly connecting the motor scroll duct wall and the suction scroll duct wall. The scroll duct walls include curves having substantially arc-shaped cross-sections. A radius of curvature of the arc of the motor scroll duct wall is greater than that of the suction scroll duct wall. The scroll duct does not form a protrusion in the inside. The air discharged from the fan creates a secondary flow in a single course of a swirling flow in the scroll duct. Therefore, noise due to interference with the discharging flow and secondary flow reduces.

Abstract: A heat dissipation device and a blade structure thereof are employed to increase input air volume, A new impeller, mounted on the driving means, includes a hub and a plurality of rotor blades arranged around the hub. Preferably, the inner side of each rotor blades extends to a top surface and side surface of the hub. An upper edge of the rotor blades can extend axially beyond the top surface of the hub in the air inlet end for increasing the intake airflow by introducing the side airflow through the space defined between the inner edges of the plurality of rotor blades and the top surface of the hub.

Abstract: A radial turbine impeller is provided, comprising a circular main disk provided with a plurality of blades, each having a negative pressure surface and a positive pressure surface; scallops being formed by cutting off the main disk between the negative pressure surface of the one blade and the positive pressure surface of the other blade adjacent to the one blade, respectively; wherein a minimum radius portion of the scallop having a minimum distance between a center of the circular main disk and the edge of the scallop is positioned closer to the positive pressure surface so that the scallop is asymmetric between the negative pressure surface of the one blade and the positive pressure surface of the other blade adjacent thereto.

Abstract: A small, lightweight and inexpensive thin-form centrifugal fan having a first moving blade; a second moving blade; and a stationary blade disposed between the first moving blade and the second moving blade and directing gas taken in by rotation of the first moving blade to the second moving blade. The first and second moving blades are formed such that the rigidity of their central portions is smaller than the rigidity of their outer perimeter areas.

Abstract: A centrifugal blower impeller includes a central hub and a plurality of impeller blades. The central hub includes a conical section and an outer edge. The conical section is centered with respect to a center axis and extends from the center axis towards the outer edge. The plurality of impeller blades includes first and second ends. The conical section is coupled to the first ends of the impeller blades which extend axially upward from the first ends towards the second ends. The centrifugal blower impeller also includes a rim which has a generally circular shape and is connected to the second ends of the impeller blades.

Abstract: An impeller pump with thermostatically adjustable guide vanes is suitable for use as an automotive coolant pump. The pump is driven by a constant speed electric motor, and flow variation is controlled by varying the orientation of the vanes. Orientation of the vanes is effected by a wax-type thermostat, which senses coolant temperature: flow is increased when the coolant is hot, and decreased as the coolant cools. The variable guide vanes are mounted for pivoting about radial axes, and are located just upstream from the pump impeller.

Abstract: A heat dispensing fan includes a hub having a recess defined in a top thereof so as to receive a fan member therein. The recess communicates with a side outlet in the hub and apertures defined through the hub. The fan member has a ring-shaped base plate and a protrusion extends from a center of a top of the base plate. A plurality of first curve blades extends from the protrusion and a plurality of second curve blades are located on the top of the base plate. Each first curve blade is connected to one of the second curve blades. A top cap is connected to the hub and has a hole defined therethrough.

Abstract: A mixed flow turbine includes a hub attached to a rotation axis and a plurality of rotor blades. Each of the plurality of rotor blades is attached to the hub in a radial direction, and the hub is rotated based on fluid supplied to a rotation region of the plurality of rotor blades. Each of the plurality of rotor blades has a curved shape that convexly swells on a supply side of the fluid.

Abstract: A cooling fan is characterized in jointing the bottom edges of all the fan leaves of a fan body to a common baseplate closely without any clearance. Therefore, turbulence could be thoroughly eliminated for promoting cooling efficiency when the fan body is driven to rotate.

Abstract: A turbo blood pump having a small size, that is, a small amount of blood to be filled and capable of adjusting and maintaining the slight amount of flow, and a turbo blood pump in which hemolysis is not likely to occur even if it is used at a practically high rotational speed necessary to obtain a predetermined discharging ability. The turbo blood pump to be used includes a housing having an inlet port and an outlet port; and an impeller disposed rotatably in the housing; wherein the impeller includes at least a rotation shaft and an annular connection portion to which the plural vanes are attached. The vane is manufactured so that an inlet side part is in the skew position with respect to an outlet side part.

Abstract: Methods of producing impeller castings from very hard materials are disclosed in which the formation of a selectively configured core produces an impeller casting that does not need to be machined to receive the drive shaft and eliminates the need for employing a lead babbitt or soft insert, as is known in the prior art, to receive the drive shaft, thereby producing a hard material impeller for a centrifugal pump that is significantly less costly to produce and is environmentally safe.

Abstract: A set of split bodies for forming a synthetic-resin blower fan through a hollow-article injection molding process, wherein the blower fan integrally includes a circular base, a cover portion having an air inlet opening at the center thereof, and a plurality of blades. The set of split bodies comprise a first split body including the circular base and a plurality of blade members, and a second split body defining the inner surface of the cover portion and having an outer surface on the opposite side of the first split body. The outer surface of the second split body is formed with a plurality of reservoirs each extending radially in alignment with the corresponding blade member of the first split body to define spaces to be filled with molten synthetic resin in a state where the first and second split bodies are assembled together.

Abstract: A vortex generating apparatus has the capability of attracting and removably adhering one or more solid objects. The apparatus comprises an impeller housed within a shell. The vortex attractor generates a vortical fluid flow generally in the form of a helical or spiral shaped flow. The fluid flow creates a low pressure region extending from the impeller end of the device. This low pressure region is contained by the walls of the fluid flow, thus directing the attractive forces toward a surface and minimizing effects of ambient fluid on the system. When the surface is part of a stationary object, wall, floor or ceiling, the vortex attractor may move toward and adhere to the surface. When the surface is part of a movable object, the vortex attractor may attract the object and maintain the attracted position.

Abstract: A process of manufacturing a component for a hydrodynamic machine in which the component comprises a base body (16) and a plurality of blades (8) which are to be installed on the base body (16). The process comprises the steps of installing the plurality of blades (8) on the base body (16) by a shaped fitted connection with the base body (16) by applying continuous pressure against the base body (16) and using a prefabricated torus as the base body (16). The prefabricated torus is pressed by a pressure roller (20) against the plurality of blades (8) while holding the plurality of blades (8) in a device (4) against the pressure of the pressure roller (20). A component for a hydrodynamic machine, comprising a base body (16) and a plurality blades (8) installed by the inventive process, is also disclosed.

Abstract: An impeller for a molten metal pump includes a base and a plurality of vanes having openings for flow of molten metal there through during pumping. Alternatively, or in combination with the vane openings, a single drain opening extending through the base of the impeller may be provided remote of the rotational axis of the impeller. In another embodiment, an impeller provides axial and radial pumping. The multiflow impeller includes at least one pumping chamber inclined into the direction of rotation to provide axial pumping.

Abstract: A method for the early detection of aerodynamic instability in a turbomachine compressor is described which involves collecting and normalizing signals from sensors distributed uniformly around the circumference of the compressor and detecting events for which the normalized signals do not pass through a zero value during a length of time Tz which is at least greater than the time taken for two successive moving blades to travel past the sensor. A decision regarding the imminence of aerodynamic instability is then taken after the detected events have been analyzed and decision criteria have been applied. The decision criteria may be based on the event detection rate and/or on the spatio-temporal position of the events detected across all the sensors.

Abstract: The improvements are made in the turbine scroll and the turbine blades. The scroll structure for the radial turbines is characterized by the foregoing scroll having a scroll width ratio between the width in the radial direction (&Dgr;R) and the width in the direction of the rotation (B) ranging from &Dgr;R/B=0.3 to 0.7. It is further characterized by the configuration in which the turbine blades have cut-away areas at the blade corners by a prescribed amount, which are provided on the inlet edge at the shroud side and hub side where the operating gas flows.

Abstract: A vortex generating apparatus has the capability of attracting and removably adhering one or more solid objects. The apparatus comprises an impeller housed within a shell. The vortex attractor generates a vortical fluid flow generally in the form of a helical or spiral shaped flow. The fluid flow creates a low pressure region extending from the impeller end of the device. This low pressure region is contained by the walls of the fluid flow, thus directing the attractive forces toward a surface and minimizing effects of ambient fluid on the system. When the surface is part of a stationary object, wall, floor or ceiling, the vortex attractor may move toward and adhere to the surface. When the surface is part of a movable object, the vortex attractor may attract the object and maintain the attracted position.

Abstract: A cylindrical blade for a rotor of the purely radial type of a centrifugal compressor with a medium-high flow coefficient comprises a first surface (3) of the pressure side and a second surface (5) of the suction side of equal curvature with generatrices parallel to the axis (Z) of rotation of the rotor, the lines of curvature of the said surfaces (3, 5) being defined, in a system of Cartesian coordinates (X, Y, Z) by the ratio between the coordinates of a discrete set of points (10) belonging to them and the outer radius (R) of the rotor (20).

Abstract: A cylindrical blade for a rotor of the purely radial type of a centrifugal compressor with a medium flow coefficient comprises a first surface (3) of the pressure side and a second surface (5) of the suction side of equal curvature, both having generatrices parallel to the axis (Z) of rotation of the rotor, in which the line (7) of curvature of the said surfaces (3, 5) is defined, in a Cartesian reference system, by the ratio between the coordinates of a discrete set of points (9) belonging to the line and the outer radius (R) of the rotor (10).