Abstract: A radial inflow rotor for a gas turbine engine has a dual structure for improving the low cycle fatigue life of the saddle region. The interior core or hub of the rotor is a high strength polycrystalline alloy while a series of outer blade segments is individually cast as single crystals and bonded so that their low modulus (100) crystallographic axis is aligned substantially tangential to the rotor's circumference at the saddle.

Abstract: An impeller for pumps, turbines, fans, etc., of the closed type, having a number of vanes arranged between cover discs. In order to reduce the secondary flows within the impeller, the secants between the suction side of the vane and the cover discs are displaced with respect to the intersections at the pressure side of the vane. This impeller is rotationally non-symmetrical.

Abstract: For improving the cooling of the rotor armature disk (2) of an electromagnetic retarder, connected to an outer flange (10) by a circle of arms (9) forming ventilation fins, these arms are formed by two parallel dividing walls (12) defining a narrow elongate pocket (13) whose bottom is formed by the disk and which opens axially into the free face of the flange through a slit (14) formed in this flange.

Abstract: A blower for fluidized particulates has a housing with an inlet in one wall. The housing defines a chamber which also has an outlet. A rotatably mounted shaft projects into the interior of the chamber. Circumferentially spaced around and projecting laterally from the shaft are a plurality of blades which individually have a shape selected to substantially maximize the impulsive pressure on the particles delivered through the outlet upon rotation of the shaft. Each of those blades has a notch defined toward the shaft from the laterally outer blade periphery with that notch having a size and shape selected to significantly reduce noise created by movement of the blade across the outlet.

Abstract: The invention relates to compressor manufacture. The impeller comprises a base disc (1) wherein, according to the invention, the angle (.beta.) between its internal surface (5) and the plane (p) perpendicular to the impeller rotation axis (0--0) is 0.5-1.degree. larger than the angle (.alpha.) between its external surface (4) and the same plane (p).

Abstract: A centrifugal pump is proposed for handling liquids carrying solid abrasive particles in a casing having a flow-through portion formed by a discharge passage and a flow-through passage of an impeller accommodated inside the casing. The discharge passage is confined by a front and rear wall of the casing, relative to the incoming flow of the liquid being transferred, and by a peripheral wall of the casing integral with the front and rear walls. The geometry of the peripheral wall of the casing follows the pattern of the distribution of the solid abrasive particles in the flow-through portion of the pump. The flow-through passage is formed by a carrying disk mounted on a drive shaft and having vanes secured thereto, and by a driven disk secured on the vanes.

Abstract: The invention provides an armature rotor for electromagnetic retarder, comprising at least one disc (2) extended axially on one of its faces by a plurality of fins (9), each fin being defined by two parallel or substantially parallel faces slanted with respect to the corresponding radii, the tips of the fins being connected together by an annular flange (11) and the assembly formed by the disc, the fins and the flange being made as a single moulded block from ferromagnetic material. The fins (9) of said rotor are particularly thin, numerous and so close together, the thickness of each fin being less than 5 mm and the width of the gap between two consecutive fins, in its narrowest zone, considered perpendicularly to the facing faces of the fins, being less than 10 mm.

Abstract: A high capacity centrifugal pump for the transfer of liquids is presented. The pump comprises four major components held in rigid assembly by means of screws and pins: a drive unit which includes a drive shaft, a keyway and key, an end play control collar and an impeller mounting fixture; a one piece pump housing comprising mounting legs and a large internal diameter outlet port, a circular pump chamber cavity and a shaft hole containing a lip seal and a pair of flanged sleeve bearings; a one piece impeller of a width slightly less than its diameter; an end plate encompassing a large diameter inlet port. The drive shaft and attached impeller are mounted off center in the cylindrical pump chamber to permit liquid escaping from the impeller to enter a surrounding area which closely resembles the volute chambers common to conventional single stage centrifugal pumps.

Abstract: A centrifugal pump wherein the back shroud of a brittle impeller of ceramic or glass is coupled to the radially outwardly extending disc of a metallic adapter whose hub receives torque from the pump shaft. The adapter has a flange which surrounds the peripheral surface of the impeller or it has a collar which surrounds a complementary collar of the back shroud. The arrangement is such that the coupling between the adapter and the impeller does not subject the impeller to any tensional or other stresses which would be likely to affect the integrity of the brittle impeller. The disc of the adapter is adjacent the rear side of the back shroud so that the adapter does not interfere with the flow of conveyed material to, in and from the impeller.

Abstract: Pump having an impeller with accurately formed radial passages and the method for making it.

Abstract: A pump unit, particularly for use in a dishwasher, includes first and second pumps having respective impellers and a motor drive shaft fixed to the two impellers for alternately rotating the impellers in a first direction, during which only the first pump delivers a liquid, and an opposite second direction during which only the second pump delivers a liquid. The first pump is a peripheral outflow pump, and the second pump is a centrifugal pump the impeller of which includes blades oriented forwardly with respect to the second direction of rotation.

Abstract: An impeller, comprising a main disc (1), blades (2) and a covering disc (3) which consists of interconnected web (4) and ring (5). The joint of the web (4) and ring (5) is detachable to form mated surface (6 and 7) in the place of the joint and has on the surface (7) of the ring (5) an annular shoulder (8) and on the surface (6) of the web (4) an annular groove (9) accomodating the shoulder (8). The internal diameter Do of the web (4) is less than the diameter (D) of the ring (5) along their mated surfaces (6 and 7) by 1 to 1.5.times.10.sup.-3 Do.

Abstract: A fluid energy converter having a squirrel-cage-like rotor in which blades peripherally distributed about a horizontal axis of rotation are in a plane generally parallel to the axis of rotation. An entry at one end of the rotor is arranged to face the oncoming fluid for receipt thereof. A contoured deflector on the interior of the rotor forms an annular path or duct for redirecting the predominantly axial flow of fluid from the entry outwardly to the peripherally distributed blades and through the slots therebetween. The total area of the slots exists through which the fluid passes is preferably made less than either the entry area of the cross-sectional area of the duct leading to the blades such that the blades act as a constriction in the fluid passageway, somewhat as a venturi restriction in the flow path.

Abstract: A vane-type impeller having a plurality of abuttably-adjacent, interconnected components at least some of which are made of an abrasion-resistant ceramic material is improved by a layer of a resiliently-flexible material between at least each component made of an abrasion-resistant ceramic material and each component it is abuttably adjacent for increasing the capability of each component made of the abrasion-resistant material of withstanding impact forces.

Abstract: A radial impeller for use in centrifugal pumps wherein a reduction of the outer diameter entails a change in the total head but does not affect the capacity because the front coverplate of the impeller is inclined with reference to a plane that is normal to the impeller axis. The inclination of the outer marginal portion of the front coverplate with reference to such plane increases in response to decreasing outer diameter of the impeller. The specific speed of the impeller can be increased from approximately 11 to approximately 35 min.sup.-1 by reducing the outer diameters of the coverplates. The exit angles of the vanes are selected in such a way that they remain constant irrespective of the selected outer diameters of the coverplates within the range which is required to change the specific speed from 11 to 35.

Abstract: An armature rotor for an electromagnetic retarder includes at least one disk (2) made from a ferromagnetic material connected to an inner fixing ring (7) by an annulus of arms (9) forming ventilation fins, the largest diameter portions of these arms projecting axially from the face of the disk opposite the air gap (E), and the crests of these portions being joined together by an annular web (10), the assembly formed by the disk, the ring, the arms and the web being formed of a single molded block. The maximum outer diameter of the ventilation stucture formed by the arms and the web is greater than the outer diameter of the disk, considered at the level of the mean plane of this disk. Two thin collars (13 and 14) defining therebetween a groove (15) extend the two axial faces of the disk radially outwardly.

Abstract: An elastomeric-covered shrouded impeller having a pair of disk-like shrouds enclosing vanes and vane passages which has an improved throat opening having sweeping internal sidewalls is disclosed. A three-piece mold core is utilized to form the vane passage and the sweeping curved throat inlet of the impeller.

Abstract: An impeller of a centrifugal fluid-type rotary machine includes impeller blades each having a concave and convex surface of which the shape is formed of parallel generatrices inclined with respect to a rotary shaft by an angle defined for each impeller blade. A method of manufacturing the impeller includes inclining a main plate material of the impeller with respect to a plane of a table of a machine tool by a desired angle, fixedly mounting the plate on the table after placing the plate on a rotation indexable jig, controlling three axial positions of the plate in the right and left, front and rear and upper and lower direction by a three-axis controller and cutting out the main plate or side plate by a cutting tool to integrally form the impeller blades on the plate.

Abstract: An impeller for a rotary fluid machine of the centrifugal type is disclosed which is adapted to be constructed as a liquid pump or gas compressor. The impeller comprises a disc having a boss which is fitted on a drive shaft, and a plurality of blades which are uniformly spaced apart circumferentially and axially project from at least one side of the disc. Each blade has a front and a rear surface, and a fluid path is defined between the front surface of a blade and the rear surface of an adjacent blade. The fluid path is arranged to extend from around the boss to the outer periphery of the disc. The width of the fluid path decreases gradually from around the boss toward the outer periphery of the disc, but the fluid path has a constant depth. The front and the rear surface of each blade are substantially arranged along circular arcs having different radii of curvature which are struck from a common center point.

Abstract: In a centrifugal pump, an enclosed-type impeller is provided with a plurality of auxiliary side vanes on either or both of the front and back faces of the impeller which project toward and conform with suitable running clearances to the walls of the casing adjacent the impeller. Annular members projecting axially from the sides of the impeller about the periphery thereof serve to limit circulation of working fluid into the spaces along the sides of the impeller. In one embodiment, the annular projection defines radially oriented passages or channels for transmitting fluid which is driven by the centrifugal action of the side vanes.

Abstract: A dual alloy radial turbine rotor with high tensile strength hub material exposed in the saddle regions between the blades to prevent fatigue that causes cracks in the saddle regions is manufactured by producing the hub with additional material at the outer portions of a frustoconical rear portion of the hub. After diffusion bonding of the outer surface of the hub to the mating inner surface of the blade rim, portions of the blade rim in the saddle regions are machined away to produce finished saddle configurations with the high tensile strength hub material exposed.

Abstract: A cantilever shaft centrifugal pump including a volute casing and impeller within said casing and mounted on the end of the cantilever shaft. The volute chamber has an inlet coaxial with the axis of the cantilever shaft and an outlet extending tangentially of the wall of said volute casing. The impeller is of the shrouded type having spaced front and rear shrouds opening at the periphery of said shrouds with impeller vanes therebetween. The outer walls of the front and rear shrouds conform to arcs struck from the center of the bearings for the shaft, and the walls of the pumping chamber have clearance with the walls of the front and rear shrouds along arcs struck from the same center as the center of the walls of the front and rear shrouds. This accommodates radial excursions of the impeller and shaft upon large radial thrusts on the impeller and avoids catastrophic contact between the shrouds of the impeller and the stationary surfaces of the pumping chamber.

Abstract: An impeller of a centrifugal blower includes a hub, a hub plate, a plurality of blades and a shroud. The hub plate has an outer diameter which is smaller than an inner diameter of the shroud and a portion of the blades existing in the difference between the diameters is provided with a parting plane of molds, whereby the impeller can be integrally molded by the injection molding.

Abstract: A pump of centrifugal type having both an impeller unit and an expeller unit coupled together for effecting frictionless hydraulic seal during operation within an appropriate housing therefor. By providing an expeller unit separate from the impeller unit, the portions of the impeller unit which wear fastest can be replaced as needed without the need for replacing other components as soon. This greatly reduces the cost of maintenance and replacement. Also, rotor vanes and stacked separator discs in a preferred embodiment provide for greatly reduced manufacturing and assembly costs, and yet allow the flexibility of easy replacement of only parts that are severely worn or corroded as needed. Both the method of making and the method of assembly are encompassed by this invention.Furthermore, all of the component elements are preferably rubber covered for maximum protection against abrasion and corrosive action of the liquid being pumped.

Abstract: An impeller in a pump, in particular a sewage pump, the passage of which is required to have a given transmission capacity for transmitting the impurities present in the sewage water. When small volumetric flows are being pumped at great delivery lift, it would be advantageous, with a view to achieving good efficiency, to make the passage narrower than the inlet aperture, but up to date it has not been possible to do this without impairing the transmission capacity. In the impeller of the invention, this has been solved in that for achieving sufficient transmission capacity one wider point has been provided in the passage, located between the inlet and outlet margins of the impeller blade.

Abstract: Atomized liquid dispersing apparatus includes a substantially cylindrical casing having an open rearward end constituting an air inlet and a motor driven centrifugal rotor for drawing air into the air inlet, the rotor being integral with an annular concentric deflector having a larger diameter than the outer blade diameter and a width substantially equal to the width of the blades, the deflector also including an inwardly directed concentric collar. The deflector defines an open concentric space outwardly of the outer periphery of the rotor blades in which the direction of airflow is redirected from a substantially radial flow to a substantially axial flow as the rotor and deflector rotate together, the airflow then being directed into a subsequent annular passage.

Abstract: An improved Francis-type turbine runner permitting a significant reduction in cavitation is provided by shaping the runners extending between the ring and crown in such a fashion that at least a portion of the area of the streamlined suction face side of each blade is (when used as a turbine) exposed when viewed in the axial direction looking away from the crown.

Abstract: A centrifugal pump impeller, particularly for use in pumps for effecting forced circulation of contaminated fluids in the primary circuits of nuclear reactor plants, has an impeller body which is surrounded by a cylindrical wear ring. The wear ring has an exposed end face and a second end face which is adjacent to a circumferential shoulder of the impeller body. The second end face of the ring is formed with axially parallel bores or slots which extend toward but short of the first end face, and the shoulder has recesses which are aligned with the open ends of the adjacent bores or slots. The first end face of the ring is formed with markers in the form of notches which register with the corresponding bores or slots and allow for accurate positioning of a boring tool which is used to bore out the ring after a certain period of wear to facilitate its separation from the impeller body and replacement with a fresh wear ring.

Abstract: A centrifugal blower including a casing formed with a discharge port and a suction port, and an impeller mounted in the casing and having a plurality of backwardly curved vanes arranged circumferentially of the impeller. The suction port has a semicircular suction member located in spaced juxtaposed relation to a semicircular curled portion formed at the forward end of a shroud of the impeller. An annular guide plate may be attached to the inner side of the suction member and formed at its open end with a wall portion disposed along the shroud which is formed at its forward end with an annular wall extending into a space defined between the suction member and the guide plate. Hair may be provided on one of opposed wall surfaces of the suction member and the annular wall of the shroud.

Abstract: A highly wear-resistant impeller for centrifugal pumps of composite construction comprising a base and a cover plate formed of material which can be worked with relative ease and an insert sandwiched between said base and cover plate formed of high temperature and wear-resistant material.

Abstract: A blade of the fan wheel of a diagonal-flow fan, which blade should ideally have a shape of a twisted double-curvature or undevelopable surface, is formed from a portion of a combination of a cylindrical plate and a planar plate tangent to the cylindrical plate or of a combination of a pair of mutually circumscribing cylindrical surfaces, which portion constitutes a developable surface. To realize the formation of a blade from the developable surface, lines of intersection between combined cylinder and planar plates or combined cylinders and a number of coaxial imaginary conical surfaces representing streamlines in the fan wheel are used as a basis for design.

Abstract: In a single stage, single suction, high speed centrifugal pump utilizing a closed Francis-vane impeller, operating noise is reduced by encasing a single-step helical gear drive arrangement in a common bearing housing with the impeller's shaft. The operating noise is further reduced by forming the driven helical gear directly on the impeller's shaft to improve dynamic balance, and by mounting a plurality of fins on the bearing housing of the pump to absorb some of the high frequency sound wave energy of the pump, and to translate a further portion of the high frequency sound wave energy into low frequency mechanical vibrations of the fins. Operating noise is further reduced by encasing the fins within a shroud and by providing a fan to blow ambient air by the fins to further disrupt the sound wave patterns emanating from the bearing housing. Operating noise is still further reduced by maintaining the impeller's shaft under tension whereby vibration of the shaft is reduced, as is the noise produced thereby.

Abstract: A new device for the displacement of fluids, has at least one essentially revolving covering, which has the form of a trunk of a cone or pyramid, which minor base has an inlet or catch-basin inlet for fluids. The revolving covering contains a core which is concentric therewith, and which has a surface of revolution non-parallel to the wall of the covering and which converges progressively towards the same so as to define therebetween an annular conduit that gets gradually narrower towards the major base of the above-mentioned revolving convering, which base forms an annular outlet or discharge socket for the fluid.

Abstract: A blade of the fan wheel of a diagonal-flow fan, which blade should ideally have a shape of a twisted double-curvature or undevelopable surface, is formed from a portion of a cylinder, which has a single-curvature or developable surface. To realize the formation of a blade from the single-curvature surface, lines of intersection between a cylinder and a number of coaxial imaginary conical surfaces representing streamlines in the fan wheel are used as a basis for design.

Abstract: A blade of the fan wheel of a diagonal-flow fan, which blade should ideally have a shape of a twisted double curvature or undevelopable surface, is formed from a portion of a cylinder, which has a single-curvature or developable surface. To realize the formation of a blade from the single-curvature surface, lines of intersection between a cylinder and a number of coaxial imaginary conical surfaces representing streamlines in the fan wheel are used as a basis for design.

Abstract: Disclosed is an impeller in a centrifugal blower, especially a high-pressure blower, wherein the curved part of the front plate of the impeller is replaced by a conical supporting ring. The upper edge of the supporting ring is attached to the blades of the impeller and the lower edge to the cylindrical suction ring of the impeller. A guide ring made of thin plate is mounted inwards from the supporting ring.

Abstract: A centrifugal pump adapted for use in a fermentor is provided. The fermentor includes an outer vessel which has mounted therein a generally centrally located draft tube. A centrifugal pump is mounted adjacent to one end of the draft tube and is operably connected to a motor for rotation thereby. The centrifugal pump includes a plurality of vanes radiating outwardly from a region adjacent the center of rotation and cover members positioned on opposite sides of the vanes. The vanes and the cover members cooperate and define flow paths through which medium can be induced to flow due to the centrifugal forces created during rotation of the vanes. The vanes have a distance between respective side boundaries thereof which is less at a position inwardly of the outer disposed end of the vanes than at the outer disposed ends of the vanes.

Abstract: A fabricated, heavy duty centrifugal pump impeller wherein the relatively heavy gauge shrouds are formed by plastic deformation such as by metal spinning, stretch forming or hydroforming. The hub is similarly formed and a plurality or regularly circumferentially spaced spiral vanes extend axially therebetween so that when the hub, blades and shroud are joined by welding or brazing, there is formed a heavy duty impeller having an axially extending inlet and a radially extending annular outlet. Following the fabrication, the impeller is finished and metallized.

Abstract: Disclosed is a fluid-flow machine comprising at least one disc-shaped rotor provided with flow channels for a flow medium. The intake openings of the flow channels are disposed on one side of the rotor, while the respective exit openings are located at the other axial surface, the distance of all said intake openings from the axis of rotation being different from that of said exit openings.Each flow channel has a radially outer and a radially inner elbow, each elbow having two legs forming an angle of about 90.degree. with one another. One leg of one said elbow leads to the intake opening and extends in the direction of the relative velocity of the intake flow prevailing thereat, one leg of the other elbow leading to the exit opening and extending in the direction of the relative velocity of the exit flow prevailing thereat. The respective other legs of the two deflector elbows are aligned with a substantially radial connecting section connecting said deflector elbows with one another.

Abstract: An improved diffusion bowl and pumping vanes of a centrifugal pump stage are employed in axially stacked, multi-stage pumps for use in oil wells. The wall thickness of the annular casing portion of the diffusion bowl element is reduced to a minimum consistent with the axial loading on the pump stage and the impeller vanes are radially extended to terminate closely adjacent the minimum wall thickness portion of the casing, thereby significantly increasing the pumping pressure developed by the stage without reducing the efficiency of the stage.

Abstract: A blade of the fan wheel of a diagonal-flow fan, which blade should ideally have a shape of a twisted double-curvature or undevelopable surface, is formed from a portion of a combination of a cylindrical plate and a planar plate tangent to the cylindrical plate or of a combination of a pair of mutually circumscribing cylindrical surfaces, which portion constitutes a developable surface. To realize the formation of a blade from the developable surface, lines of intersection between combined cylinder and planar plates or combined cylinders and a number of coaxial imaginary conical surfaces representing streamlines in the fan wheel are used as a basis for design.

Abstract: There is disclosed apparatus for preventing rotating stall in a centrifugal rotor. An aerodynamically designed blade extension is directed from the inner edge of the blade into the eye of the rotor.

Abstract: A centrifugal pump includes an impeller and a volute casing. The impeller comprises a main disc and a plurality of vanes which project axially from at least one side of the disc. A fluid passage is formed between each pair of adjacent vanes. The passage has a constant depth and a gradually decreasing width from an inlet to an outlet thereof. Each fluid passage assures a flow of the fluid along the front surface of the associated vane and prevents the occurrence of a vortical flow therein. The volute casing has an inner surface which is substantially U-shaped in section and effectively converts the kinetic energy imparted to the fluid by the impeller into hydraulic pressures.

Abstract: A fan impeller comprises a back plate, a front plate and a plurality of blades fixedly attached between the front plate and the back plate. Two bars are welded to the back of each blade and are bolted to the front and back plates. Each blade is a channel section member having a base and two sides, the base being normal to the planes of the front and back plates of the impeller, one side lying along the front plate and the other side lying along the back plate. The sides extend from the base in the direction of rotation of the impeller in use so that the inside of each channel section is presented to the airstream as the impeller rotates. The inside working surface of each blade may be hardened to a minimum hardness of Rockwell C55.

Abstract: In an impeller of a centrifugal blower of the backward type having a relatively large blade inlet width as contrasted with the diameter of the impeller, blades are each shaped, as seen from the axial direction of a rotary shaft, in a concave curve with respect of rotation of the impeller, each of the blades has a larger inlet diameter on the shroud plate side than on the hub plate side, and each of the blades has a leading edge shaped, in a meridional plane, in a smooth convex curve directed radially inwardly of the impeller. By these structural features, it is possible to bring the inlet blade angle into agreement with the inlet relative flow angle at each point of the leading edge of each blade and to reduce the rate of a reduction in the velocity of flow on the shroud plate side.

Abstract: A blade of the fan wheel of a diagonal-flow fan, which blade should ideally have a shape of a twisted double-curvature or undevelopable surface, is formed from a portion of a cylinder, which has a single-curvature or developable surface. To realize the formation of a blade from the single-curvature surface, lines of intersection between a cylinder and a number of coaxial imaginary conical surfaces representing streamlines in the fan wheel are used as a basis for design.

Abstract: A blade in the fan wheel of a diagonal-flow fan, which blade should ideally have the contoured shape of a twisted double-curvature or undevelopable surface, is formed from a portion of a plate which has a flat planar surface. To develope the flat blade shape from a planar surface, lines of intersection between a plate and the streamsurfaces in the ideal fan wheel, which are represented by a number of coaxial imaginary conical surfaces, are used as a basis for design. The realized flat blade can then be orientated between the frustoconical main and side plates to form a diagonal-flow path similar in performance to the ideal blade of a twisted double-curvature surface.

Abstract: An improvement on Patent 3,651,621 has a blower construction using an impeller with backward curved blades for flow stability and high efficiency under varying conditions. The construction also resists the high stresses imposed by high speed and high flow velocities. A muffler for the discharge of the blower is provided.

Abstract: A Francis-type runner for pump-turbines comprising a crown ring, a shroud ring and a plurality of runner blades interconnected therebetween, each of said blades satisfying the following relations where 0.09.ltoreq.B/D.ltoreq.0.30:______________________________________ 15.degree. .ltoreq. .theta. .ltoreq. 35.degree. in the case where 10.degree. .ltoreq. .gamma. .ltoreq. 19.degree.; and 20 (.gamma. - 12.3)/9.degree. = .theta. in the case where 19.degree. .ltoreq. .gamma. .ltoreq. 28.degree.; where ______________________________________D = a diameter of a circle circumscribing the outer ends of the respective runner blades;B = a height of the outer end of the runner blade between the crown ring and the shroud ring;.gamma.

Abstract: A surface aerator equipped with a central vertical shaft which can be coupled to a drive means, substantially vertical blades being mounted on the lower end of said shaft.According to the invention an upwardly expanding, smooth cone is fitted underneath, and coaxially with, the shaft, the greatest radius of which cone is appreciably greater than the radius of the shaft, but appreciably smaller than the radius of the aerator at the outer edges of the blades, while the upper edge of this cone is adjoined by an overhead vertical cylinder, the successive blades being linked by an outwardly and upwardly inclined, at least substantially flat connecting plate, which is upwardly staggered with respect to the cone.