Abstract: The object of the invention is to improve the efficiency of a turbomachine blade provided with a reinforced hole for accommodating a damping element. To this end, the raised end faces (12, 13) of the marginal region (11), reinforced toward the hole (10), of the blade body (4) are formed with an acute angle (&agr;) open toward the leading edge (5) of the blade body (4) and/or with an acute angle (&bgr;) open toward the blade tip (9).

Abstract: A cooling fan has a structure to prevent objects from being stuck by the blades of the cooling fan. The cooling fan includes rings spaced from the hub of the cooling fan, that prevent objects from striking the blades while the fan turns. As an alternative, a fan includes ribs radially spaced on the fan blades so as to deflect objects before being struck by the blades.

Abstract: An axial-flow fan device includes a fan frame having an intake opening and an outlet opening, and an impelling apparatus mounted in the fan frame and having fan blades and an air gap generation member surrounding the fan blade. The air gap generation member which is made of a plurality of rings is mounted on a blade wheel and connected to the ends of the fan blades to reinforce the fan blades, with each of the rings overlapping and separated from each other for generating a plurality of air gaps when the fan blades rotate.

Abstract: A turbine assembly comprising a first rotatable component having a first lip with a first axial facing surface and a second rotatable component having a second lip with a second axial facing surface. The components are held together by an axial load so that the first and second axial surfaces are in frictional contact across a radial plane whereby torque is transmitted between the components. A pilot ring mounted either above or below the radial contact plane maintains the radial position of the two components.

Abstract: A moving turbine blade apparatus has a plurality of moving blades (5) adapted to be mounted on a rotor shaft, a plurality of snubber covers (6) formed on outer ends of the moving blades (5), respectively, so as to be arranged successively in a circle having its center on the axis of the rotor shaft, and a plurality of ribs (10) projecting from outer surfaces of the snubber covers (6), respectively, so as to extend in a circle having its center on the axis of the rotor shaft. At least one of the opposite end portions of the rib (10) has a thickness measured in a direction of the axis of the rotor shaft greater than that of a middle portion of the same rib (10). Steam loss attributable to the leakage of steam through gaps around the outer ends of the moving blades (5) is reduced.

Abstract: The invention relates to a unit comprising an accessory fixed to a heat exchanger comprising fins made of aluminum, this accessory being equipped with bearing surfaces designed to come to rest on the fins. The bearing surfaces are formed on an accessory support made of steel integral with the accessory, and an electrically insulating material is placed between the bearing surfaces and the fins of the exchanger.

Abstract: A centrifugal blower wheel including a center disc assembly and a blade assembly. The blade assembly includes a plurality of blades, each blade including a notch which is engaged over a peripheral edge of the disc assembly in frictional engagement. The peripheral edge of the center disc assembly includes axially outwardly facing surfaces for engaging edges of the notches in the blades, and the axially facing surfaces are formed as roughened surfaces, including a plurality of grooves and/or ridges, for facilitating engagement between the notches of the blades and the center disc assembly to thereby positively prevent relative movement between the center disc assembly and the blade assembly when a torque is applied to the center disc assembly to rotate the centrifugal blower wheel.

Abstract: A propeller (10) including a hub (11), a plurality of blades (13) extending outwardly from the hub (11) and part annular connecting elements (17) which interconnect tips (16) of adjacent blades (13). The trailing edges (21) of the elements (17) extend from the trailing edge of one blade (13) at its tip to intersect the adjacent blade (13) at a relief point (23) on the high pressure side of the blade (13) between the leading and trailing edges of the blade (13). The leading edge (20) of the elements (17) extends from the leading edge of a blade (13) at its tip (16) to intersect the adjacent blade (13) at a relief point (25) on the low pressure side of the blade (13) intermediate the leading and trailing edges of the blade (13) at its tip (16).

Abstract: A centrifugal blower impeller for a vehicle heating and ventilation system has a central hub, a peripheral crown having a set of vanes for drawing the air axially through the crown, to deliver the air radially towards the outside, and a set of arms, spaced apart at regular intervals and joining the hub to the crown. This set of arms defines a generally concave bowl-shaped envelope, with the arms being joined to the hub in the center of the bowl and with the crown at its periphery. At least some of the arms have reinforcing ribs close to the junction between the arm and the hub. Each rib lies in an axial plane and is on the side of the arm corresponding to the concavity of the bowl.

Abstract: A turbine 400 has a central duct 410 which accelerates fluid passing through it and a blade configuration which retards the flow of fluid near the tips of the turbine. This structure results in a vortex having a higher fluid pressure behind the tips of the turbine blades 408 and a lower fluid pressure behind the duct. In the present invention, this vortex is enhanced by (1) an increased acceleration of the fluid passing through the duct 410 and a deceleration of the fluid passing through the blades 408; and/or (2) by a fluid redirection device 850 for directing the fluid passing through the duct towards the outer diameter of the turbine.

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 fan includes a hub coupled to a driving shaft of a motor, a plurality of blades installed on the outer circumferential surface of the hub to be spaced from each other at a predetermined interval, and a band connecting free ends of the blades. An axial direction width (W1) between a leading edge and a trailing edge at the free end of each of the blades is greater than a width (W2) of the band.

Abstract: The object of the invention is to prevent the quantity of airflow by a fan from decreasing in dependence on the distance between the fan and obstacles such as an engine in a device for introducing and discharging cooling air having a shroud with a high covering rate. In the device for introducing and discharging cooling air having the shroud with the high covering rate, an airflow direction changing member is provided downstream of the fan, and each fixed blade of the member has a shift angle in the radial direction and an attack angle in a rotation direction of the fan, so that the air tends to be discharged outward in the radial direction.

Abstract: A motor fan for a cleaning apparatus that creates the suction caused by a rotor in a suction device mounted in the cleaning apparatus such that foreign materials are drawn therein has a fan member coupled to the rotor and is provided with a plurality of curved fins thereon and which fins cause the air in a collection compartment to pass through a suction inlet by the suction when the rotor is rotated, and to discharge the sucked air outside a body through outlets and an exhaust outlet. A reinforcing member is provided and is closely engaged with a rear surface of the fan member, and which reinforcing member insertedly receives a shaft of the suction device and firmly is tightened by a nut.

Abstract: A compressor blade vibration reduction mechanism for a high-speed radial impeller for minimizing fatigue failures from various excitation sources. The vibration reduction mechanism includes a plurality of loose-fitting lashing pins coupling each impeller blade to an adjacent impeller blade. Each lashing pin extends through a first aperture in a blade located adjacent to the blade tip and through a second aperture of an adjacent blade. The second aperture of each blade is located a greater distance from the leading edge of the blade than the first aperture. The second aperture is located in an area of the blade having lower vibration during operation than the blade location where the first aperture is located.

Abstract: A mixed flow fan and heat exchanger assembly is "blow through" in that the fan discharges air into the upstream face of the heat exchanger which provides a flow resistance. The fan is mixed flow so that there are both axial and significant radial components to the air flow exiting the fan impeller. The radial components result in a static pressure facilitating flow through the heat exchanger. The assembly includes an impeller having a generally cylindrical hub and a number of backwardly swept blades. The impeller has an outlet swept radius that is greater than its inlet swept radius. A shroud encloses the impeller and guides the air flow into the impeller and to the heat exchanger. The cylindrical hub and a blade apparent solidity of less than one make the fan impeller adaptable to manufacturing in a single piece by a molding process. In a second embodiment there is a downstream blockage and the radial components to the air flow reduce impingement upon the blockage.

Abstract: A fan for an automotive radiator has a hub with a group of blades extending radially outwardly from the hub. A support member joins together the outward extensions of the blades in the first group. A second group of blades extend radially outwardly from the support member and a second support member joins together the ends of the blades in the second group.

Abstract: A blade for use in an axial fan includes a plurality of vanes which each have a winglet formed on their front face to increase the air flow of the fan at a given blade velocity.

Abstract: A propulsion device comprises a circular series of inclined airfoil elements. Each airfoil element is connected along its upper side to a rigid plate member, which is adapted to be rotated at high speed via a motor output shaft. The airfoil elements are oriented on the plate such that their vacuum-inducing surfaces face upwardly and outwardly of the circular series, and their pressure surfaces face downwardly and inwardly of the circular series.

Abstract: A portable hand-held concrete, mortar and gypsum mixer comprises a small gasoline powered implement having a drive shaft extending generally downward from the handles to a gear box. A transverse shaft driven by the drive shaft extends to either side of the gear box. Mounted on the transverse shaft are a plurality of blades shaped to thoroughly agitate and mix a combination of water and the ingredients for concrete, mortar, gypsum or similar heavy, hard to mix materials. Surrounding the blades are thin rings attached to the blades to form a round circumferential surface about the blades and thereby prevent the blades from directly contacting the mixing trough or other means of containing the mix. In the alternative, the plurality of blades may be shaped at their peripheries to form substantially continuous circular circumferences.

Abstract: A wheel fan of a range hood used in the kitchen having improved blades and mechanisms for locating a top plate, which includes blades, a top plate sinking inwardly like a bowl, a bottom ring, convex rings set at the side and top of the blades, and channels formed on the top plate and the bottom ring which match the convex rings, so that assembly will be simplified, and performance will be reliable with less noise.

Abstract: A compressor assembly includes a housing, and a rotatable impeller within the housing which includes a hub and blades extending from the hub. A ring circumscribes the leading edge of the blades, and cooperates with a groove in the housing to define a clearance therebetween which is larger than the clearance between the connecting edge of the blades and a corresponding conforming portion of the housing. This permits free flow of gas around the ring to enhance the operating range of the compressor wheel. The ring also stiffens the blades, permitting the thickness of the hub to be reduced, thereby further enhancing the operating range of the compressor wheel.

Abstract: In an axial fan, the angle of curvature of the median line of each blade in axial projection is nil at the hub and for about one third of the radial extension of the blade from the hub. The blade angle of each blade is substantially constant along the blade and the chord between the leading edge and the trailing edge of each blade is substantially constant along the blade between the hub and the outer ring.

Abstract: A rotor includes a disc having a plurality of blades extending therefrom. The blades include tip shrouds, each having first and second axial ends, and first and second circumferential faces. The first and second faces of adjacent tip shrouds are spaced from each other to define gaps therebetween. The first and second ends each include U-shaped slots, each having an arcuate damper wire disposed therein. The slots are aligned generally parallel to an axial centerline axis of the rotor for allowing ease of manufacture and assembly while providing effective frictional damping by the damper wires urged by centrifugal force against the slots.

Abstract: Fitting a shroud band to the tenons located at the tips of a blade of a turbine uses a jig. The precise location of the tenons relative to pitch, radial and axial location is determined by fingers which can interlock with an elongated segment. The fingers have apertures which define the position of the tenons. The apertures in the fingers are transferred to a shroud band into which apertures are formed. The shroud band is progressively apertured to form a long arc shroud for adjacent blades of the turbine.

Abstract: The ring-shaped propeller, in its basic form, comprises a multi-blade propeller and a structurally continuous ring-shroud attached to the tips of the blades. The shroud has an airfoil cross-section which varies from blade tip to blade tip, the segments between adjacent blades being identical. The airfoil section varies essentially lineraly in camber and twist and this results in rather abrupt reversals in the shroud airfoil section at each blade tip. Aerodynamic loading of the blades and shroud at the junctures between the blades and shroud are matched so that the tendency for blade tip vortices to form and the tendency for shroud transitional portions to generate vortices of rotation opposite to blade tip vortex rotation are in balance and no top vortices are formed. Instead there is a uniform vorticity shed from the shroud trailing edge. Two concentric shrouds may be used and the concept adapts to use with rotor/stator systems and dual, counter-rotating propeller systems.

Abstract: Turbines are suspended coaxially between a hub structure and a pivot. The hub acts to stabilize the coaxial turbine system and it acts as the power take off. The pivot acts to stabilize the other end of the coaxial turbine system. A coaxial assembly of unique flexible turbines convert wind energy into rotational mechanical energy. Driver lines attached to the extremities of the turbines transmit this energy to the extremities of the hub structure. The hub imparts torque to a drive shaft at its center thorough a moment arm and the drive shaft supplies power to a useful application, such as generating electricity. The coaxial turbine system is suspended from tower to tower between existing power transmission lines. Electricity generated by this system is fed directly into the existing power distribution system. This coaxial generator system utilizes a variety of turbine configurations and can be suspended in the wind in a number of ways.

Abstract: Moving blading for a steam turbine, the blading comprising blades (1) having respective bodies (3) provided with caps or fins (4), said caps or fins (4) on adjacent blades coming into contact at least during rotation of the blading over a plane surface which is substantially parallel to the radial axis (Z'Z) of the blade and giving rise to blade body twisting by virtue of said contacts (7, 8), the blading being characterized in that, in addition to the contacts (7 and 8) between adjacent caps or fins (4), it includes a link which is provided by means of additional contacts (A, A') free to slide rectilinearly in a plane corresponding to the plane of each cap or fin (4) along an axis which is substantially perpendicular to the axis of rotation OO' of the blading, said additional contacts (A, A') being situated at a relatively large distance from said contacts (7, 8) which give rise to twisting. The invention improves the vibration properties of the blades.

Abstract: Blading for a rotating thermal machine consists of an airfoil (1), a root (4) and a shroud plate (5) or a shroud, the tip (2) of the airfoil (1) having a spigot-type step (11) with a semi-circular groove (12) extending around the whole periphery of its generated surface. The shroud plate (5) or the shroud has a recess corresponding to the step (11) with a semi-circular groove (8) extending around the complete periphery. At least one piece of a firmly seated heat-resisting wire (10) is located in the circular duct formed by the grooves (8, 12) as the fastening element between the components (1, 5). The blading is manufactured by pushing and/or pulling the wire (10) sideways into the duct formed by the grooves (8, 12).

Abstract: The axial fan produced by the novel method may have a cylindrical shroud, an impeller mounted coaxially within the shroud, and a bell-shaped deflector extending across the exhaust to redirect the airflow toward radially outward directions. A malleable blank may be cut and shaped to form the impeller having at least three blades, the peripheries of which define a cylinder coaxial with the shroud. The impeller should have a depth-to-radius ratio exceeding 0.5.

Abstract: A stirring device attached to the vertical shaft of a sand mill having an annular metal collar received on the shaft and a flat, plastic, circular disc extending radially beyond the collar for a stirrer member concentrically affixed to the radial surface of the collar. The stirrer member has an outer ring and a central hub which are joined by circumferentially spaced spokes.

Abstract: A turbine wheel for a hot gas turbine engine operable at relatively high peratures, e.g. above 2,000.degree. F., and high velocities, e.g. above 30,000 r.p.m. The blades are formed of temperature-resistant ceramic material. A special annular band of high tensile strength material is affixed to tip areas of the blades for translating centrifugal forces into compressive loadings on the blades. To compensate for differential thermal expansion of the band relative to the blades a localized cooling system is provided for selectively cooling the annular band without cooling the blades.

Abstract: A method for mechanically securing turbine blades to mounting bands to form compressor stages. The turbine blades have end tangs which protrude through preformed slots in the bands. According to the method, a washer is pierced from stripstock and driven onto the end tang such that the tang stabs or pierces through the washer as the washer is driven flush against the band. In the preferred embodiment the washer stripstock is a composite; i.e., it includes its own brazing material which melts and braizes the blade to the band in a subsequent operation. An apparatus for carrying out the method comprises a blade seat, a stripstock retainer and a mechanically driven punch which substantially simultaneously punches the washer out of the stripstock and drives the washer onto the end tang of the blade.

Abstract: Blades in the steam path of a steam turbine diaphragm are assembled into slots in full circular bands and are structurally bonded thereto by welding. After stress relief, the bands are each separated into two 180 degree pieces by line cuts which pass between adjacent blades. The bands are then welded to semicircular rings having planar mating surfaces. The welding of the rings to the bands is performed with minimum welding without concern for whether the welds enter the interface sufficiently far to contact the blades themselves.

Abstract: A stirring device attached to the vertical shaft of a sand mill having an annular metal collar received on the shaft and a flat, plastic, circular disc extending radially beyond the collar for a stirrer member concentrically affixed to the radial surface of the collar. The stirrer member has an outer ring and a central hub which are joined by circumferentially spaced spokes.

Abstract: A device for connecting the turbine blades of a turbine having a plate-shaped member provided at the radially outer end of each turbine blade and extended substantially at a right angle to the longitudinal plane of the turbine blade. The plate-shaped member is projected from the leading and trailing edges of the turbine blade, and is provided with through bores formed in each projected portion. Connecting members having cylindrical pins or the like projections are disposed between two adjacent turbine blades in such a manner that the projections are rotatably received by respective through bores. Namely, one of the connecting members is connected to the plate-shaped member of the leading edge of the turbine blade while the other connecting member is connected to the plate-shaped member of the trailing edge of the preceding adjacent turbine blade.

Abstract: A rotor for radial fans wherein the blades which are secured to the peripheries of the end walls surround or are surrounded by a spirally wound rod. The end portions of the rod are fastened to the end walls so as to maintain the median portion of the rod in prestressed condition. The rod enhances the resistance of the rotor to torsional stresses.

Abstract: A fan for use as a front fan or in the lift fan system with aircraft jet engines having blades supported by a segmented hub platform and a segmented tip platform which are supported by hub support hoops and tip support hoops. The blades are secured to the hub platform segments and tip platform segments by composite pre-preg pin stock which is inserted in holes in the tip platform, the hub platform and fan blades. The pins are placed under axial compression to expand the pin diameter to provide a precise fit. Channel members are provided between the tip hoops and the blades. Some of the channels have extensions which form seals.

Abstract: A sealing bar is provided for each gap between adjacent shroud plates to form part of the coolant recovery system of an open-circuit, liquid-cooled gas turbine. The undersides of the edges of the shroud plates at each gap are chamfered and a small cylindrical bar is supported in the recess provided thereby. Centrifugal force urges the bar into sealing engagement with the chamfered surfaces.

Abstract: A rotor for a turbine apparatus and method for fabricating the same. The rotor has a plurality of rotating blades mounted thereon subtended by a substantially annular shroud member. The shroud member is comprised of two axial segments joined along a circumferential seam. The segments have openings on their adjoining edges which are sized to accept a stem portion of a tenon integrally disposed on the radially outward tip of each rotating blade. The tenon stem has integral therewith a bulbous cap portion which, in the assembled state, simultaneously overlap circumferentially and axially the adjoined shroud segments. A circumferential groove is defined between the shroud segments and a suitable securing arrangement is provided in the groove to maintain the relationship between the axial shroud segments.

Abstract: In a centrifugal snow blower, a plurality of shovel-like blades are fixed on a shaft for rotation about its central axis. A ring or annular band is arranged concentrically about the central axis and is secured to the frontal cutting edges of each of the blades.

Abstract: A plurality of turbine buckets annularly arranged around a rotor are each provided with a ledge disposed at right angles to the outer surface of each bucket. Each ledge includes a leading end portion and a trailing end portion each formed therein with a vertical hole, leading and trailing end portions of the ledge of each turbine bucket extending in opposite directions on both sides of the bucket. There are provided cover pieces each interposed between ends of the adjacent two turbine buckets and formed on the upper surface with a plurality or cylindrical projections adapted to be loosely received in the vertical holes formed in the ledges of the adjacent two turbine buckets.

Abstract: A turbo machine rotor assembly which includes a turbine wheel having moving blade covers or connecting pieces connected to adjacent moving turbine blades. Each of the moving turbine blades includes a first ledge and second ledge at a leading edge and trailing edge side portions, respectively, of the tip of the blade with the first and second ledge portions extending substantially in tangential directions of the turbine wheel but in opposite directions to each other. One of the first and second ledges is provided with a through hole or aperture extending radially of the turbine wheel. The moving blade cover or connecting piece is provided with a pair of spaced pins receivable in the apertures of the first and second ledges for connecting the first ledge of one moving turbine blade and the second ledge of an adjacent moving turbine blade in such a manner that the upper surface of the cover contacts with the lower surfaces of the first and second ledges.