Abstract: A pump impeller of a centrifugal- or a half axial type meant to pump liquids, mainly sewage water, the pump impeller including a hub provided with one or several vanes, the leading edges of which being strongly swept backwards. The size of the sweep angle (.alpha.) varies between 40 and 55 degrees at the connection with the hub, and 60 and 75 degrees at the periphery.

Abstract: Disclosed is a runner for a Francis-type hydraulic turbine, comprising a ring, a hub, and a number of blades all having a curved shape and being attached to the ring and hub. Each blade has an inlet edge and an outlet edge. The blades are characterized in that, in the direction of turbine rotation, the junction point of each blade inlet edge at the ring is located forwardly of the inlet edge attachment point for that blade at the hub, and the junction point of each blade outlet edge at the hub is located forwardly of the outlet edge attachment point for that blade at the ring.

Abstract: A blood pump used for extra corporeal circulation, and more particularly, as a small turbo blood pump including a casing having an interior region, an aperture formed in an upper portion defining a blood inlet, and an aperture formed in a lower portion defining a blood outlet. An impeller is rotatably mounted within said casing interior region and includes a rotary shaft and at least one vane depending therefrom. The at least one vane has an upper radius adjacent the blood inlet that is less than a lower radius adjacent the blood outlet. The base of the at least one vane forms an exterior angle of less than 90.degree. with the axis of the rotary shaft. A driven magnet is mounted to the at least one vane. The impeller is rotationally driven by a non-contacting driving magnet that is exterior to the casing.

Abstract: A single port pump impeller includes two pump vanes diverging arcuately and radially from a suction eye to form one open expanding chamber, and includes a blocking wall for closing the remaining, opposite expanding chamber. The two vanes are contained within parallel spaced apart shrouds. The shrouds include increased wall thickness regions to dynamically balance the impeller. The blocking wall can include a small aperture for providing a small stream of liquid to flow into the otherwise closed expanding chamber to prevent cavitation at a distal end of an adjacent vane. Alternately, the otherwise blocked expanding chamber can be filled with a solid material having substantially the same weight as the fluid being pumped, e.g., water, to prevent cavitation at the outside edge of one of the adjacent vanes.

Abstract: An impeller for a centrifugal pump which includes a front shroud and a rear should, the shoulds being spaced apart so as to form a plurality of passageways therebetween which are separated by a plurality of impeller blades. The impeller has an outer diameter D.sub.2 and an inlet diameter D.sub.1. Each passageway has an inlet portion with a passage outlet B.sub.2, and an intermediates portion between the inlet and outlet portions. In the inlet portion the front shroud is curve away from the rear shroud so that the passageway outlet width B.sub.2 is less than the passageway inlet width B.sub.1. A method of increasing the Best Efficiency Point Flow rate comprises providing such an impeller and also providing a new front liner or throat bush which has an inner wall which is complementary to the wall of the inlet portion of the impeller while retaining the same main liner or casing section.

Abstract: The pump is formed by pump housing defining a pump housing cavity and a column housing defining an elongated cavity. The front of the column housing is coupled to the rear of the pump housing cavity. A shaft axially from the rear of the column housing cavity into the pump housing cavity. An impeller is connected to the front of the shaft for rotation in the pump housing cavity for moving liquid from the front inlet through an outlet transverse to the axis. The impeller has vanes on its front and rear sides. A baffle is fixedly secured to the front of the column housing around the shaft and has vanes on its rear side for preventing liquid rearward of the baffle in the column housing cavity from rotating.

Abstract: An impeller in a turbomachinery has blades designed such that reduced static pressure difference .DELTA.Cp between the hub and the shroud on the suction surface of the blade shows a remarkably decreasing tendency near the impeller exit as it approaches the impeller exit between the impeller inlet and the impeller exit.

Abstract: A centrifugal fan including a fan hub lying generally in a plane normal to the axis of fan rotation and having a central opening for receiving a motor housing, and a plurality of fan blades of substantially identical construction spaced circumferentially evenly around the fan hub and extending away from the fan hub in a direction parallel to the axis of fan rotation. Each fan blade includes a leading edge at its innermost radial periphery, and the leading edge, at least at the axially upper one-half section thereof, is convexly curved in the shape of a quarter ellipse having a major axis, Mg, substantially parallel to the axis of fan rotation and a minor axis, mh, normal to the major axis Mg. The fan also includes a continuous shroud joined to each fan blade at an axially upper section of the radially outer portion thereof and the shroud is concave in cross-section.

Abstract: A radial fan wheel comprising a number of fan blades symmetrically arranged with substantially equal spacing around the rotational shaft of the fan wheel. The blades are mounted between two end plates that are arranged perpendicularly to the shaft and are provided with blade surfaces which are substantially parallel to the shaft and each of which blade extends from one point at a distance from the shaft and substantially arched in the direction outwardly towards the periphery of the wheel. One first end plate is provided with a central air inlet and is shaped with a curve that, in a position radially outwardly from the innermost edges of the blades, substantially arches towards the second end plate and further radially outwardly towards the peripheral edges of the blades. Each blade is so designed in the peripheral segment that the blade extends radially longer outwardly adjacent the first end plate than the second end plate.

Abstract: A centrifugal multiblade fan comprises a plurality of curved blades which are circularly arranged about a common rotation axis at evenly spaced intervals defining a curved air flow passage between every neighboring blades. Each curved blade has concave front and convex rear surfaces which extend longitudinally in parallel with the rotation axis. A lower annular end plate is provided for putting thereon lower ends of the circularly arranged blades. A radially outside part of each curved blade has a radius of curvature which is greater than that of a radially inside part of the blade. A slit extends longitudinally parallel with the rotation axis at a radially inside portion of each blade.

Abstract: An impeller of a centrifugal fan having fifty or more blades of not larger than 250 mm in outer diameter which has a casing and a multi-blade impeller rotatably supported in the casing, wherein a centrifugal force is applied on air entered into an inlet formed on the casing when the impeller is rotated, and an air of high pressure is taken out through an outlet formed on a portion of the casing. An outer peripheral surface of the impeller is inclined or curved so as to have an inlet side large diameter portion and a blade holding base side small diameter portion, or is stepped so as to have an inlet side cylindrical outer peripheral surface of large diameter and a blade holding base side cylindrical outer peripheral surface of small diameter connected to the inlet side cylindrical outer peripheral surface. The inlet side cylindrical outer peripheral surface and the blade holding base side cylindrical outer peripheral surface are substantially the same height.

Abstract: A mixer, having a unique rotor, is particularly suitable for mixing paper pulp having a consistency of about 6-15% (medium consistency) with a bleaching gas having an ozone content of at least one percent, and typically at least six percent. The rotor comprises a disc shaped base, a hub at the center of the base for connecting it to a drive mechanism for driving the rotor at an angular velocity of 1000-6000 rpm, and one or more rings concentric with the base and extending outwardly from the base at least about three inches (and of the same for different heights). A number of blades may extend radially through the center of the base along the contour of the rings, extending outwardly from the base, rings, and hub. Degassing holes may be formed in the hub and connected up to a suitable degassing structure in the mixer. The rings may have a cross-sectional shape corresponding to that of a truncated right circular cone frustum, or may have a rectangular cross-section.

Abstract: A centrifugal slurry pump is disclosed which includes a specifically designed impeller having three circumferentially spaced vanes mounted between a back disc shaped shroud and a front open annular shroud. The vanes are thick in cross-section for wear-resistance and channels formed between adjacent ones of the vanes permit a relatively large sphere, or sphere-like objects, to pass therethrough, the sphere having a diameter of in excess of 14 inches, while maintaining an efficiency in excess of 80% and a head in excess of 30 feet. The vanes have a mixed pitch and a negative overlap, with quite large channels formed between adjacent vanes so as to pass the large spheres which are encountered during dredging operations.

Abstract: A clean room fan unit is used to provide a continuous flow of air to a clean room, where the air flow is substantially free of undesired impurities. The fan unit includes a rectangular housing that defines a cavity. A fan unit is located inside the cavity for drawing air into the housing and into the clean room. The fan has blades with pitch angles selected to provide a particular flow path and flow rate that reduces the amount of noise generated by the fan unit while increasing the efficiency of the fan unit. A perforated plate is situated within the air flow path in the fan unit housing such that the perforations diffuse the air flow before it passes through a filter and exits the housing. The uniform air flow provided by the perforated plate produces a reduced noise level.

Abstract: A pump impeller is adapted for rotatably mounting within a volute of a centrifugal slurry pump. The pump impeller has an intake opening that is formed coaxially with an axis of rotation of the impeller. The impeller also has an outlet opening that extends about the periphery of the impeller and blades that extend generally radially between the intake opening and the outlet opening. The region between adjacent blades defines a respective blade passage through which slurry flows upon rotation of the impeller. The impeller is dimensioned relative to the volute so that the ratio of the blade passage width at the entry of the blade passage to the blade width passage at the periphery of the impeller is in a range of 1.5 to 1.7, and the ratio of the diameter of the impeller to the blade passage width is in a range of 9.3 to 10.2 and that the ratio of the impeller diameter to the width of the volute is in a range of 3.8 to 4.2. This dimensioning enables the pump to operate in a specific speed range of 22 to 30.

Abstract: A pump body 10 of a drainage pump 1A comprises a pump chamber 12, inlet 15, and outlet 17. A rotary vane 300 mounted in the pump body 10 is coupled to a motor mounted above the pump body 10, and comprises a shaft 310 and four large-radial blades 320. Formed below the large-radial blades 320 are small-radial blades 350 to make a liquid at the inlet rise. Lower edges of the large-radial blades 320 are connected together by a disk 350 having an opening at the center and interceptively dividing the surface of the liquid rising from the inlet. Thus the amount of the liquid in contact with the large-radial blades 320 above the disk 350 decreases, and the load to the rotary vane decreases. At the same time, bubbles, noise and vibrations caused by bubbles also decrease. By surrounding the outer circumference of the large-radial blades 320 with a ring member, return water W5 moving back from the outlet 17 when the pump stops is damped by the wall member 360 and returns smoothly to the inlet 15.

Abstract: An impeller is for separating a conveyed stream of material. The impeller has a central rotatable hub with a plurality of blades extending radially therefrom. The hub and blades form a number of generally wedge-shaped material receiving spaces within the impeller. One set of spaces has a baffle arrangement which is configured to direct material in this set outwardly from the impeller on the upstream side of the baffle arrangement. Another set of spaces has a guide arrangement which is configured to guide the material in this set of spaces outwardly from the impeller on the downstream side of the baffle arrangement. The impeller is particularly useful for separating streams of particulates, such as wood chips, compressed shavings, or the like.

Abstract: The turbine comprises a plurality of blades disposed between two end plates and defining flow passages between an inner ring and an outer ring. The turbine is formed by first and second parts, each part made as a single one-piece part out of thermostructural composite material, the first part forming both a first end plate and the blades, while the second part forms the second end plate which is applied against the blades of the first part. The first part and the second part are preferably assembled to each other solely by being clamped together via their central portions.

Abstract: A rotating fan assembly is provided for use in single stage and multi-stage applications. The fan assembly includes a fan member having a tapered disk member, a flat annular ring member and a plurality of blade members interposed between the disk and the ring. The fan member may be housed in an enclosure shroud having a tapered case and a flat shell member thereby reducing case length from start of the shell to the inlet plane. The flat shell member doubles as a shroud for both the rotating fan member and for a stationary fan when used in multi-stage designs.

Abstract: A water pump comprises an impeller including a rotor main body and vanes arranged to protrude from an end face of the rotor main body and disposed radially. Each vane has an inlet portion which faces an inlet port of a housing and has an inner end which is substantially perpendicular to the direction of cooling water flowing from the inlet port to the inner periphery of each vane. The inlet portion of the vane has a circular arc with an inclination angle which is substantially identical to an inflow angle of cooling water.

Abstract: A turbocharger compressor impeller structured as a combination elevated auxiliary blades fan surrounded by a curved inducer which provides a high gas volume low speed turbocharger compressor to deliver pressured gas into a combustion engine.

Abstract: Noise is minimized in the design of multiblade radial fans, wherein the specifications of the impeller of a multiblade radial fan are determined so as to satisfy the correlation expressed by the formula .nu..gtoreq.-0.857Z.sub.1 +1.009 (in the preceding formula, .nu.=r.sub.0 /r.sub.1, Z.sub.1 =(r.sub.1 -r.sub.0)/?r.sub.1 -nt/(2.pi.), where r.sub.0 is the inside radius of the impeller, r.sub.1 is the outside radius of the impeller, n is the number of radially-directed blades, and t is the thickness of the radially-directed blades).

Abstract: An impeller for a radial flow device selected from the group consisting of radial--and mixed-flow compressors, pumps and turbines which is designed for both aerodynamic performance and manufacturability at high production rates. The mean blade surface of the impeller is substantially helical, as the angle of any point on the mean blade surface relative to a meridional plane passing through the axis of rotation of the impeller varies linearly with the radius and z-axis location of that point relative to an arbitrary radial plane z.sub.0. A single-piece mold for making the impeller, and a method for making the mold, are also disclosed. The impeller can made in a high-speed molding process without significant post-production processing, and it can be easily withdrawn from a mold without destruction or disassembly of the mold.

Abstract: A centrifugal ventilator fan having a base plate with an axis of rotation, an inlet ring having an opening therethrough and a plurality of generally flat blades, each having first and second side edges, a leading edge and a trailing edge is provided. Each blade is connected to the base plate along the first side edge, and is connected to the inlet ring along the second side edge. The blades are radially spaced about the axis of rotation and are backwardly inclined with respect to a direction of rotation of the fan. A portion of each blade adjacent to the leading edge has a radius of curvature such that the blade portion adjacent to the leading edge extends generally inwardly towards the axis of rotation to reduce noise generated by the ventilator fan.

Abstract: A fan wheel for high-temperature operation, especially in ovens, includes a star-like or ray-like base plate having a central middle region, protrusions protruding substantially radially beyond the central middle region and having an outer contour, axially drawn up blades disposed on the protrusions and a base plate surface with axially drawn up segments extending from the middle region into the vicinity of the protrusions. According to one embodiment, the segments include a central, annular segment and star-like or ray-like segments adjoining the central, annular segment and extending through the protrusions of the base plate substantially symmetrically with the outer contour. According to another embodiment, the segments include a central, annular segment and star-like or ray-like segments adjoining the central, annular segment, originating from the central, annular segment and following the outer contour of the base plate.

Abstract: An impeller in a turbomachine has blades designed such that a reduced static pressure difference .DELTA.Cp between a hub and a shroud on a suction surface of a blade has a tendency to remarkably decrease in the vicinity of an impeller exit as it approaches the impeller exit from an inlet.

Abstract: A fan for a cooling system of a motor vehicle has a closed impeller with a plurality of radial vanes, each of which is provided with an essentially radially oriented vane base. The radial vanes extend in a generally radial direction with respect to an axis of rotation of the impeller. An inner contour of the vanes is defined by leading edges of the vanes, and an outer contour of the vanes being defined by trailing edges of the vanes. The exterior diameter of the outer contour of the radial vanes and the interior diameter of the inner contour of the radial vanes decrease in a direction from the cover disk toward the impeller bottom.

Abstract: This compressor is provided with a compressor impeller (1) which has a hub (2) of plastic fitted with moving blades (5), with a shaft which is connected to the hub (2) and extends along an axis (4), and with a housing which surrounds the compressor impeller (1).It is intended to provide a compressor which has a compressor impeller produced from a plastic and is nevertheless suitable for comparatively high operating temperatures. This is achieved by the hub (2) of the compressor impeller (1) being produced from a thermoplastic reinforced with continuous fibers, and by the moving blades (5, 20) being prefabricated separately from a thermoplastic reinforced with continuous fibers and connected with a form fit to the hub (2).

Abstract: A pump body 10 of a drainage pump 1A comprises a pump chamber 12, inlet 15, and outlet 17. A rotary vane 300 mounted in the pump body 10 is coupled to a motor mounted above the pump body 10, and comprises a shaft 310 and four large-radial blades 320. Formed below the large-radial blades 320 are small-radial blades 350 to make a liquid at the inlet rise. Lower edges of the large-radial blades 320 are connected together by a disk 350 having an opening at the center and interceptively dividing the surface of the liquid rising from the inlet. Thus the amount of the liquid in contact with the large-radial blades 320 above the disk 350 decreases, and the load to the rotary vane decreases. At the same time, bubbles, noise and vibrations caused by bubbles also decrease. By surrounding the outer circumference of the large-radial blades 320 with a ring member, return water W5 moving back from the outlet 17 when the pump stops is damped by the wall member 360 and returns smoothly to the inlet 15.

Abstract: A fan for a vacuum cleaner has a fan housing, motor and impeller. The fan housing has an inlet and outlet. The impeller has a hub and multiple flexible blades, formed of a plurality of strips. This flexible blade fan provides better air performance, less noise, better durability, and easier impeller installation than conventional vacuum cleaner fans.

Abstract: A centrifugal seal assembly for a pump, including a pump casing having a pump chamber, a pump impeller, an impeller passageway and a rotatable pump impeller shaft, the seal assembly comprising a rotatable main body disposed within a seal chamber and attached to the pump shaft, a plurality of circumferentially spaced apart vanes on one side of the main body, each vane including a curved leading edge portion, the vanes being configured such that R.sub.v /D.sub.eo is in the range from 0.3 to 0.7, where R.sub.v equals the curvature of the leading edge of the vanes and D.sub.eo equals the outer diameter of the vanes.

Abstract: A centrifugal pump of the type adapted to pump high consistency fiber suspensions includes impeller vanes having portions which are immediately adjacent the fiber suspension in the interior of a vessel from which the suspension is to be pumped. The pump additionally includes a sideplate which is mounted directly to the vessel containing the fiber suspension so as to permit the impeller of the pump-to be brought in close proximity to the fiber suspension in the vessel. The sideplate additionally includes elongated portions that extend along the outer contour of the vanes of the impeller to determine the directions from which fiber suspension enters the impeller of the pump.

Abstract: This disclosure relates to an impeller for use in a centrifugal fan that also includes a housing and a drive shaft. The impeller is mounted on the shaft for rotation therewith within the housing. The impeller further includes a disk-shaped back plate and an axis of rotation extending through the center of the circular back plate. A plurality of circumferentially spaced fins or blades extend generally radially of the axis of rotation, selected blades including mulching parts and the remainder of the blades being devoid of the mulching parts. The mulching parts are adjacent the radially inner portions of the selected blades and the mulching parts extend substantially axially of the impeller and into an air intake opening of the housing. The selected blades having the mulching parts are circumferentially spaced and are separated by at least one remaining blade which is devoid of a mulching part.

Abstract: Disclosed is an improvement in a drying apparatus comprising a cylindrical drying vessel, the inner wall surface of which makes up a heat-transmitting surface, a heat-generating means encircling the cylindrical drying vessel, and at least one rotating vane assembly rotatably fixed in the cylindrical drying vessel. The rotating vane assembly has vane sections, which leave between their circumferential edges and the heat-transmitting surface of the hollow cylinder an annular space small enough to allow wet material to cross and contact the heat-transmitting surface without falling therein. Each vane section extends obliquely upward in the direction which is opposite to the rotating direction, and the circumferential edge of each vane section extends less than 360 degrees as viewed from the top.

Abstract: A fan for a vacuum cleaner has a fan housing, a motor and an impeller. The fan housing has an inlet, an outlet, a scroll-shaped side wall, a back wall and a flat front wall. The impeller has a hub and multiple blades. The blades have a leading edge that is tapered upward, a top edge that is tapered downward, and a trailing edge that is tapered downward. Such tapering of the top edge and trailing edge provides less noise and better durability without diminishing air performance.

Abstract: An impeller structure of a closed type centrifugal pump suitable for inelastic fluids such as an engine coolant, comprises front and rear shrouds having a driven connection with a pump drive shaft, and a series of blades provided between the front and rear shrouds for pressurizing an incoming fluid. An inner edge (17a) of a first blade of two adjacent blades is formed to be up-sloped from its inside corner to its outside corner, whereas an inner edge (17c) of a second blade of the two adjacent blades is formed to be down-sloped from its outside corner to its inside corner, so as to enhance an efficiency of the pump, suppressing occurrence of cavitation at or near the pump inlet.

Abstract: In a turbo, pump according to the present invention, blades 3e and a shroud 3f are continuously formed with a boss 3c of a turbine wheel 3, a meridian plane configuration of the shroud 3f is formed as an concave arcing rotatable surface. A boss shroud 3f.sub.1 is formed substantially parallel to the axis of rotation O. A portion 3e.sub.2 of a blade outlet edge 3e.sub.1 is smoothly continuous to the boss shroud 3f.sub.1 and largely projects downstream. A portion 3e.sub.3 of the blade outlet edge 3e.sub.1 is formed substantially perpendicular to the axis of rotation O. The blade outlet edge 3e.sub.1 is formed with a smooth arc-like curve projecting convexly downstream between the portion 3e.sub.3 and the portion 3e.sub.2. An angle of the blade outlet edge 3e.sub.1 is set to an angle of substantially 0.degree. at the portion 3e.sub.2 of the blade outlet edge 3e.sub.1 and to substantially the conventional degree of angle at the portion 3e.sub.3 of the blade outlet edge 3e.sub.1.

Abstract: A centrifugal pump for shear sensitive fluids includes a pump housing defining an interior volume. An impeller comprising at least two vanes is rotatably mounted in the housing. The impeller vanes, which preferably are airfoil-shaped, are spaced from the interior housing of the pump whereby to leave a gap between the vanes and the pump housing so as to permit a portion of the fluid in the spacing to flow smoothly over the top contour of the impeller vanes.

Abstract: An inlet orifice structure and impeller assembly for a centrifugal flow fan. The inlet orifice has an elliptical cross section in a plane passing through the axis of rotation of the fan. The impeller is shrouded and also has a similarly elliptical cross section. The impeller is sized so that, when assembled together, the shroud overlaps and rotates around the stationary inlet orifice. In a preferred embodiment, there are 13 impeller blades nonuniformly spaced around a hub plate. A particular blade spacing is disclosed and claimed. The inner surface of the hub plate is arcuately curved to guide the air flow through the fan from its entering axial direction to its radial exiting direction. The contour of the hub plate allows for the fan drive motor to be partially recessed into the plate.

Abstract: A centrifugal pump has an impeller with vanes including cutting edges at the intake side of the pump bowl. The intake side of the bowl is closed by an intake plate, and an external cutter has blades in close cutting relationship to raised anvil ribs on the intake plate. The intake plate has an outward opening recess including a first portion of one diameter and a second portion of a greater diameter. The external cutter has respective first and second portions closely received in the first and second recess portions, respectively. The first portion of the external cutter cooperates with the first portion of the intake plate recess, and the second portion cooperates with the second recess portion, to chop solid matter entering the pump through the intake plate.

Abstract: A blood pump for circulating blood by a rotor rotating in a space of a casing which is formed substantially in a flat shape and has a suction port and a discharge port, comprises a conical projecting portion provided at the central portion of the rotor, and a blade body formed continuously to a vicinity of the outer periphery of the base portion of the projecting portion, in which upper side recessed passages and lower side passages are alternately and radially formed. Base portions of the upper side recessed passages and the lower side passages are interconnected to each other by communicating passages. With this blood pump, the passages for blood are formed at either of the upper and lower gaps between the rotor and the casing, so that blood is transferred to the outer peripheral portion, thus preventing the solidification of the blood due to the stagnation thereof.

Abstract: A multi-layer disk fan with blades operates quietly. The multi-layer disk fan with blades is formed by laminating a multiplicity of annular disks in a measured spaced relation, the arrangement having such a feature that a multiplicity of blades are interposed between the annular disks and the ends of the respective blades. The blades are further positioned a circumferentially measured spaced apart distance inward of the outer peripheral edges of the annular disks. Turbulent air flow caused by peeling-off at the tips of the blades through the effect of laminar flow by the disks is effectively prevented. Likewise, distortion in outlet speed at the outer peripheral edges of the annular disks is controlled, reducing noises from turbulent flow and interference and resulting in quiet operation.

Abstract: An apparatus which uses friction to generate heat for heating liquids. The apparatus includes a cylindrical rotor disk housed inside a close-fitting housing structure. The rotor disk is connected to the shaft of a motor which turns the rotor disk at high revolutions inside the rotor chamber of the housing structure. The rotor disk has a plurality of curved, outward radiating, closed-end passageways formed therein. During operation, liquid flows into the housing structure via an inlet port which fills the rotor chamber of the housing structure and the curved passageways in the rotor disk. When the rotor disk is rotated at high speeds, the liquid located inside the curved passageways is pulled outward by centrifugal forces which creates a vacuum therein. When the vacuum becomes sufficient, the liquid "cracks" or boils at a low temperature. The resulting vapor formed inside the curved passageway suddenly forces the liquid remaining inside the curved passageway outward and exit at relatively high speed.

Abstract: A centrifugal pump of the type adapted to pump high consistency fiber suspensions includes impeller vanes having portions which are immediately adjacent the fiber suspension in the interior of a vessel from which the suspension is to be pumped. The pump additionally includes a sideplate which is mounted directly to the vessel containing the fiber suspension so as to permit the impeller of the pump to be brought in close proximity to the fiber suspension in the vessel. The sideplate additionally includes elongated portions that extend along the outer contour of the vanes of the impeller to determine the directions from which fiber suspension enters the impeller of the pump.

Abstract: A fan is capable of directing air passing between upstream and downstream ends of the fan to flow in both axial and radial directions and includes a hub, a plurality of fan blades and a ring. The hub is shaped as a truncated cone with a wide upstream end and a narrow downstream end. Each of the fan blades has an upstream edge, an outer end and an inner end connected to the hub. The fan blades project radially and outwardly from the hub and are spaced circumferentially. The ring is disposed at the upstream edges of the fan blades and interconnects the outer ends of the latter. The ring is formed with a plurality of curved strips which extend respectively between two adjacent fan blades to permit air flow in the radial direction. The curved strips cooperate with the hub to form passages which permit air flow in the axial direction, and are shaped as sections of a parabolic surface which opens toward the upstream end of the hub.

Abstract: A gaseous fluid aspirator/pump apparatus including a rotary impeller (10) with radially extending blades, the impeller being mounted in a housing having a gaseous fluid inlet and outlet wherein gaseous fluid moving from the inlet (15) to the outlet (14) is turned from axial flow into the impeller to radial flow from the impeller, said impeller and an associated portion of the housing (16) being shaped to prevent flow separation and turbulence in the gaseous fluid stream while under the influence of the impeller. The impeller inlet (15) includes an inlet configuration of curvate conical from matching the configuration of the housing (16) in the area of the inlet opening. This configuration acting to prevent flow separation while turning the fluid flow through a large angle of approximately 90.degree. and acceleration and deceleration of the fluid flow is substantially prevented.

Abstract: A centrifugal pump for conveying fluids with suspended solids has a single-blade impeller. The blade angle, as measured at the meridian line of the blade, is positive at the rear end of the blade and less than 0 degrees along a portion of the blade which extends from the front end towards the rear end of the blade through an angle of at least 90 degrees. The inner side of the blade defines a segment of a circle which is coextensive with this portion of the blade. The front end of the blade has a surface which bridges the inner and outer sides of the blade, and such surface is either flat or forms an arc having a radius of curvature substantially greater than half the blade thickness.

Abstract: Movement of a fluid such as air is produced by rotating about a rotational axis a plurality of flow generating plates arranged in parallel with clearances therebetween. The clearances between adjacent flow generating plates for producing the movement of the fluid most effectively only by an adhesion of the fluid to the flow generating plates are set to be twice a value of a distance of an intermediate portion between the surface of the flow generating plate contacting a portion of the fluid in a close boundary layer which is rotated and moved substantially together with the flow generating plate and a remote fluid boundary layer which is substantially not influenced by centrifugal force due to the rotation of the flow generating plate. In the case of air, the clearances are about 0.5 mm. It is preferred to form the flow generating plate so as to have a waved surface for improving the flow generating efficiency.

Abstract: When the trigonometric function of the phase lag of the hydraulic excitation of the runner vanes, which varies in accordance with the combination of the number of runner vanes and the number of guide vanes of a high head pump/turbine, is denoted by cos(.theta..sub.R n), the thickness of the crown along a circle of a diameter at a mid point of the diameter of the outermost periphery of the runner is denoted by t.sub.MC, the thickness of the band is denoted by t.sub.MB, the mean thickness of the crown at the outer peripheral portion of the runner is denoted by t.sub.C, the mean thickness of the band is denoted by t.sub.B, and the rigidity ratio of the crown and band to the runner vane is denoted by K.sub.R taking the rigidity of the runner vane as a reference, the moment coefficient C.sub.MO which is a function of cos(.theta..sub.R N) and the rigidity ratio K.sub.R is selected to be less than 0.5 in accordance with the value of cos(.theta..sub.R n), and relations t.sub.C /t.sub.MC .ltoreq.1 and t.sub. B /t.sub.

Abstract: Medium consistency (e.g. about 5-18%) paper pulp is mixed with a treatment fluid by fluidizing them while subjecting them to a constantly changing shear field in radial and axial planes. This is accomplished by providing a mixer rotor having a constantly varying cross-section along a dimension of elongation. The rotor may comprise a body having an external surface simulating alternately oriented cone frustums along its axis of rotation, with vanes connected to the external surface and including portions following the surface contour. A disk may or may not be provided at the end of the body connected to a shaft. A first interior housing portion has a configuration mimicking that of the rotor, while a second housing portion defines a fluidization zone with the disk.