Abstract: A vertical axis wind turbine including a wind turbine which depends on a vortex down wind of the turbine enhancing the air flow past the vertical turbine. The vertical axis wind turbine structure includes a rectangular shaped turbine with four orbiting panels mounted to rotate at the top of a pyramidal base structure which generates a substantially horizontal vortex immediately down wind of the turbine, thus enhancing the air flow past the turbine.

Abstract: An axial-flow fan (1) is arranged on a viscous coupling (4). Fin-like stabilizers (5) are provided in the region of the blade roots, that is to say in the hub region, and these fin-like stabilizers (5) segregate the hub flow and the blade flow. In addition, a radial blade element (6) can be provided and are assigned in each case to these stabilizers and can be integrated with the surface of the stabilizer (5) to form a common surface. These special flow-conducting elements can favorably influence the fan flow in its hub region in such a way as to improve the fan output.

Abstract: An impeller for a fuel pump for supplying fuel to an automotive engine from a fuel tank includes an impeller body having a substantially disk shape with opposing first and second faces and an outer circumference. The impeller body defines a rotational axis extending therethrough perpendicular to the first and second faces. A plurality of radially outwardly extending vanes extend from the outer circumference of the impeller body and are spaced circumferentially about the impeller body. Each of the vanes includes a first half extending from the outer circumference adjacent the first face and a second half extending from the outer circumference adjacent the second face. The second halves are rotationally shifted about the rotational axis relative to the first halves. The vanes are spaced un-evenly and in a non-repeating pattern about the outer circumference of the impeller body.

Abstract: A blade for an axial-flow turbine includes an intrados producing a positive pressure between a leading edge and a trailing edge, and an extrados producing a negative pressure. The intrados is formed at its rear portion with a flat surface portion connected to the trailing edge, and the extrados has a curved surface portion formed at least at a portion corresponding to the flat surface portion. The trailing edge of the turbine blade is pointed at its end. The angle of intersection between the intrados and the extrados at the trailing edge is a right angle or an acute angle. Thus, it is possible to inhibit the flowing of a gas from the intrados at the trailing edge toward the extrados and to decrease the degree of curvature of the extrados at the trailing edge portion to reduce the flow speed, thereby minimizing a shock wave generated at the trailing edge portion to reduce the pressure loss and enhance the performance of the turbine.

Abstract: An axial flow fan wherein an impeller having a plurality of blades is supported rotatably in the cylindrical cavity portion of a venturi case so that an outer peripheral edge of each of the blades faces to an inner peripheral surface of the cavity portion with a small air gap. The outer peripheral edge of the blade is increased in thickness gradually toward a discharge port side of the venturi case from a suction port side of the venturi case. An peripheral edge portion of the blade at a suction port side of the venturi case is bent in the circumferential direction from a negative pressure surface side of the blade, so that the edge is small in thickness. An outer peripheral edge portion of the blade at a discharge port side of the venturi case has a portion extending circumferentially from a positive pressure surface side of the blade.

Abstract: A fan having balancing blade sets is disclosed herein comprising a central hub, a shaft and a plurality of blade sets. The blade sets are radially extended from an outer circumference of the central hub and each blade set is uniformly formed within an appropriate angular length to ensure stable rotation. Each blade set is comprised of various blade designs to enhance blowing efficiency.

Abstract: A vane structure for a propeller for engaging fluid and preventing cavitation or the rapid formation and collapse of low-pressure gas bubbles in a liquid. The vane structure for a propeller includes a plurality of spaced vanes that are mounted to and extend away from a hub. Each of the vanes has a leading edge, a trailing edge and an end. A lip is mounted on the end of each of the vanes for selectively engaging fluid and dispersing low-pressure gas bubbles positioned generally adjacent to the plurality of spaced vanes.

Abstract: An impeller for liquid pump that is capable of improving pump efficiency by modifying a shape of the impeller. An impeller is rotatably provided in a pump section of a fuel pump. A plurality of through holes are formed in the impeller so as to extend in an axial direction adjacent a circumference of a disk plate member. By doing so, a plurality of vanes and an outer-radial side ring portion are formed. An intake portion for the liquid, that is, a radial inner surface of the through hole that guides the liquid is inclined so that its rotating direction leading side is positioned to the inner-radial side, and thereby, a wider fluid guiding area is secured.

Abstract: An impeller having an axis about which the impeller is rotatable in a working direction of rotation A, with a plurality of aerofoil blades spaced from and arranged about the axis; the inwardly axis-facing surface of each blade defines a longer fluid flow path across the blade than the opposite outwardly-facing surface, and each blade has an angle of attack from 0° up to a positive angle of attack less than that at which the blade will induce turbulent fluid flow when the impeller is rotated in a fluid at a working speed in the working direction of rotation A so that during such rotation the impeller induces an inlet fluid flow generally axially toward the impeller and an outward fluid flow away from the impeller, where the outward flow is in directions generally inclined at an angle which lies between substantially radial and axial directions relative to the axis.

Abstract: A hollow blade for a ceiling fan is made from a selected material and has a hollow interior structure to result in a reduced weight for decreasing motor loading and saving electric power consumption, and saving material consumption for reducing costs.

Abstract: A blade for an axial-flow turbine includes an intrados producing a positive pressure between a leading edge and a trailing edge, and an extrados producing a negative pressure. The intrados is formed at its rear portion with a flat surface portion connected to the trailing edge, and the extrados has a curved surface portion formed at least at a portion corresponding to the flat surface portion. The trailing edge of the turbine blade is pointed at its end. The angle of intersection between the intrados and the extrados at the trailing edge is a right angle or an acute angle. Thus, it is possible to inhibit the flowing of a gas from the intrados at the trailing edge toward the extrados and to decrease the degree of curvature of the extrados at the trailing edge portion to reduce the flow speed, thereby minimizing a shock wave generated at the trailing edge portion to reduce the pressure loss and enhance the performance of the turbine.

Abstract: A passive fan blade for a cooling package for use in an agricultural combine comprises a generally rectangular member having an axis, a central mounting area and two opposed legs, each leg having a middle region, a leading region and a trailing region, the leading and trailing regions being angled toward the downstream direction of intended air flow. The trailing regions increase in width in proportion to distance from the axis, while the leading regions decrease in width in proportion to distance from the axis, whereby the member is impelled to rotate in the direction of the leading edges when air flows past the member. In an assembly, the passive fan blade is mounted via a bearing assembly and mounting hardware onto a hub connected to a bracket. In a cooling package, the passive fan blade assembly is mounted on a frame in close proximity to a face of a radiator or a charge air cooler to provide turbulence thereby minimizing accumulation of chaff, dust and debris in order to maintain cooling efficiency.

Abstract: An axial-flow fan having a high fan efficiency and high performance is provided by improving a fluid flow on the rear edge side of a blade tip without deteriorating the fluid flow on the front side of the blade tip, and reducing loss of horsepower without causing a large influence on loadings. The blade has a warped portion on the side surface of the blade tip on the rear edge side thereof, being formed by bending the blade tip toward upstream at angles between 5 to 30 degrees with a smooth filet R along a line C connecting a position along the blade tip at the chord length A to 1/5 A from the rear edge of the blade tip toward the front edge of the blade tip and a position along the radial length B of the blade at 1/2B to 1/10B from the rear edge of the blade tip.

Abstract: A set of fan blades comprises a plurality of blades evenly distributed around a hub case, wherein each of the blades has an outer edge from which a projection extends away at an angle.

Abstract: A method for the improvement of wind turbine rotor efficiency blades of a wind turbine rotor with serrated trailing edges each having a plurality of span-wise, periodic indentations, in the form of saw teeth having approximately 60 degrees included angles between adjacent vertices. The efficiency of an existing wind turbine rotor is improved by the attachment of an apparatus to at least part of the trailing edge of the wind turbine blades, the apparatus being in the form of a serrated panel that is fixed to the surface of the blade and has the serrations extending into the airflow behind the trailing edge of the existing blade. The efficiency of a new wind turbine blade is improved by manufacturing the blade with serrations of at least part of the trailing edge of the wind turbine blade.

Abstract: A passive fan blade for a cooling package for use in an agricultural combine comprises a generally rectangular member having an axis, a central mounting area and two opposed legs, each leg having a middle region, a leading region and a trailing region, the leading and trailing regions being angled toward the downstream direction of intended air flow. The trailing regions increase in width in proportion to distance from the axis, while the leading regions decrease in width in proportion to distance from the axis, whereby the member is impelled to rotate in the direction of the leading edges when air flows past the member. In an assembly, the passive fan blade is mounted via a bearing assembly and mounting hardware onto a hub connected to a bracket. In a cooling package, the passive fan blade assembly is mounted on a frame in close proximity to a face of a radiator or a charge air cooler to provide turbulence thereby minimizing accumulation of chaff, dust and debris in order to maintain cooling efficiency.

Abstract: A fuel pump for a vehicle includes a pump section having a flow channel and a rotatable impeller cooperating with the flow channel to pump fuel therethrough. The fuel pump also includes a motor section disposed adjacent the pump section and having a motor to rotate the impeller. The fuel pump further includes an outlet section disposed adjacent the motor section to allow pumped fuel to exit the fuel pump. The impeller includes a plurality of blades that are generally V shaped. The pump section has an inlet port and an outlet port communicating with the flow channel and has a shape according to a face angle of the blades.

Abstract: A turbomolecular pump capable of maintaining a maximum discharge rate even in a higher pressure has rotor blades or stator blades formed such that surface angles on a first surface of the blades facing the direction of rotation differ between an inlet port side of the blades and an outlet port side. The surface closer to the inlet port has a larger angle than on a side closer to the outlet port. One side of the blades has a plurality of surface portions each with different angles. The angles of the surfaces are in the range of 20° to 50° on the inlet port side, 10° to 40° on an intermediate portion, and 10° to 90° on the outlet port side. The angles of the first and second surface portions are larger than that of the intermediate surface portion.

Abstract: Small winglets placed at the outer end of each fan blade substantially reduce the vortices created in conventional fans by the pressure differential between the low pressure and high pressure sides of the blade. The winglet acts as a barrier, which substantially blocks leakage around the blade tip, thus suppressing vortices. Technical advantages include noise reduction, because there are no shedding vortices to create noise as the blades pass the struts; increased aerodynamic efficiency of the fan, providing higher air flow for the same fan speed, size, and power, because less energy is lost in vortices; and minimal cost impacts, because housings currently used for fans can still be used with standard finger guards and because winglets and blades can be formed integrally of injection molded plastic.

Abstract: A low-noise axial fan is provided with whirring sound minimized. The axial fan includes a plurality of blades arranged around a rotation axis at predetermined layout pitches. The blades are arranged at varied layout pitches. For instance, the layout pitch between the two adjacent blades may be different from the layout pitch between the remaining blades. This arrangement controls the whirring sound of the fan, which would be high in level if the blades were arranged at an equal layout pitch. A low-noise axial fan thus results.

Abstract: A continuous compression-type dewatering apparatus has a filter chamber (3), a drive shaft (17), a vane (15), and a supply path (50). The filter chamber (3) is delineated by an annular plate (2) and two side plates (1, 1). The drive shaft (17) passes through the center axis of the annular plate (2) and through the inside of the filter chamber (3), and is free to rotate with respect to the filter chamber (3). The vane (15) is disposed within the filter chamber (3), is fixed with respect to the drive shaft (17), and rotates in concert with the drive shaft (17). The supply path (50) passes through the drive shaft (17) and supplies raw fluid to the filter chamber (3). The vane (15) as two side edges (15a, 15a) facing the side plates (1, 1) and an end edge (15b) facing the annular plate (2). The side plates (1, 1) include a screen (4) for separating the raw fluid into a filtered fluid and a cake. The annular plate (2) includes an ejection port (7) for the cake.

Abstract: An impeller for a circumferential current pump is provided with a plurality of vanes, and each of the vanes has an upstream side surface and a downstream side surface in a rotating direction thereof and a center line between both these surfaces extends along a radial direction of a disc-shape member, the upstream side surface has a radially inside portion and a radially outside portion which are formed to be continuous so that the radially inside portion is in parallel to the center line and the radially outside portion is inclined forward in the rotating direction of the disc-shape member, and the downstream side surface is formed entirely to be parallel to the center line.

Abstract: A novel impeller for a regenerative turbine fuel pump improves the efficiency of the pump and yet still retains a geometry that allows it to be manufactured by conventional injection molding techniques at a relatively low cost. The impeller comprises a hub, an outer ring and a plurality of innovative V-shaped vanes. The hub defines an aperture into which the shaft of the pump is securable to allow the hub to rotate about a center axis. The outer ring is concentric to the hub. The vanes extend from an outer surface of the hub to an inner surface of the outer ring. Each vane comprises an entrance portion that extends from the outer surface of the hub and an exit portion that extends from the entrance portion to the inner surface of the outer ring. Each vane has a V-shape of a prespecified angle centered relative to a plane normal to the center axis.

Abstract: An axial flow fan wherein an impeller having a plurality of blades is supported rotatably in the cylindrical cavity portion of a venturi case so that an outer peripheral edge of each of the blades faces to an inner peripheral surface of the cavity portion with a small air gap. The outer peripheral edge of the blade is increased in thickness gradually toward a discharge port side of the venturi case from a suction port side of the venturi case. An peripheral edge portion of the blade at a suction port side of the venturi case is bent in the circumferential direction from a negative pressure surface side of the blade, so that the edge is small in thickness. An outer peripheral edge portion of the blade at a discharge port side of the venturi case has a portion extending circumferentially from a positive pressure surface side of the blade.

Abstract: A method for inhibiting radial transfer of core gas flow away from a center radial region and toward the inner and outer radial boundaries of a core gas flow path within a gas turbine engine is provided that includes the steps of: (1) providing a flow directing structure that includes an airfoil that abuts a wall surface, said airfoil having a leading edge, a pressure side, and a suction side; and (2) increasing the velocity of the core gas flow in the area where the leading edge of the airfoil abuts the wall. Increasing the velocity of the core gas flow in the area where the leading edge of the airfoil abuts the wall impedes the formation of a pressure gradient along the surface of the airfoil that forces core gas from the center region of the core gas toward the wall. The apparatus includes apparatus for diverting core gas flow away from the area where the airfoil abuts the wall.

Abstract: An apparatus for handing a waste material is disclosed. Generally, the apparatus comprises a pump mounted within a container. The container has disposed thereon a rail member. The apparatus also contains a trolley mounted on the rail. The trolley has operatively associated therewith a handling system that has attached thereto the pump. The pump has an impeller assembly that pumps the waste material from the container. The impeller assembly contains a first and second rotor blade. A process device may be included that is attached to the handling system. A process for handling a discharged waste slurry is also disclosed.

Abstract: A rotor blade airfoil of an axial-flow turbomachine, for a fan or a compressor high-pressure stage of a gas turbine system, configured in the tip area to improve supersonic performance. The blade afflux edge has a forward-back sweep. The tip region of the blade efflux edge can be designed essentially similar to the blade afflux edge, with the tip region extending across the outer 15% to 25% of the blade span.

Abstract: Efficiency of a boat propeller is increased by curved flanges extending along the tips of the propeller blades. The flanges form projections at the blade tips which deflect water that flows radially towards the tips outward into the thrust producing water flow through the propeller. The flanges have arcuate outer surfaces that face away from the propeller hub and which have a center of curvature at the axis of rotation of the propeller. Arcuate inner surfaces of the flanges have centers of curvature which are offset from the axis of rotation. This flange configuration inhibits cavitation in the region of the flanges and also at the hub region of the propeller.

Abstract: Improvement is made to the shape of blades of a fan assembly for sucking air into an annular wall through slits in the wall, in order to increase the aerodynamic performance and energy efficiency. In the fan assembly for sucking air in through slits provided in an annular wall (2), the blade tips of an axial fan (21) are bent in the rotating direction to smoothly take in air flowing in through the slits. The axial fan is formed so that the blades except the tips thereof are in a shape of a radial or a rearward tilting blade. The angle formed by the blade forward tilting angle near the blade tip of the axial fan and the slit angle is between −5 and 15°, and the blade tip is bent in the wind blowout direction. This configuration improves the P-Q characteristic, reduces noise and improves energy efficiency.

Abstract: A water turbine or pump having a rotor (1) and a stator (2). The leading edges (13) and the trailing edges (14) at least of the rotor blades (6) form a bend (15) projecting in opposite relationship to the flow direction (12). That causes a flow force resulting in a self-cleaning effect being applied to impurities which are deposited at the leading edges (13). However the adjustment design providing for adjustability of the rotor blades remains substantially unchanged.

Abstract: An improved vane system comprising of two or more vanes being part of a spherical section related to a hub characterized in that an operative concave surface of the vane being part of the spherical section. An operative convex surface of the vane being part of a spherical section and the vane having an operative anterior lateral border with an operative posterior lateral border having a free superior tip and an inferior edge related to the hub by which the vane is angularly displaced around an axis being parallel to the velocity and the drift of the fluid.

Abstract: The root end is attached to the rotor head for rotationally driving. The central portion has aerodynamic characteristics depending on the leading and trailing edges and which extend linearly from the root end in parallel to each other, and the chord dimension therebetween. A planform shape of the blade tip portion is defined by the first leading edge which extends forwardly as the distance from the outboard end of the leading edge of the central portion outwardly increases, the second leading edge and the side edge which are rearwardly swept as the distance from the outboard end of the first leading edge toward outboard side outwardly increases, the first trailing edge which is curved forwardly as the distance from an outboard end of the trailing edge of the central portion outwardly increases, and the second trailing edge which is swept rearwardly as the distance from the outboard end point of the first trailing edge outwardly increases.

Abstract: An intake and exhaust fan assembly is provided having a motor and fan assembly mounted for movement on rails toward and away from a rotatable blade damper mounted on an angle to the motor/fan assembly.

Abstract: A rotor blade (1) comprises a main blade (2) having a substantially fixed chord length (C), a front tip blade (3) having a chord length (C1) smaller than that of the main blade and connected to the main blade so that a front edge (3a) thereof is continuous with a front leading edge (2a) of the main blade, and a rear tip blade (4) having a chord length (C2) greater than that of the front tip blade and connected to the main blade so that a trailing edge thereof is continuous with a trailing edge of the main blade. The blade incidence angle (&thgr;1, &thgr;2), the washout angle (&dgr;1, &dgr;2) and so on of at least either the front tip blade or the rear tip blade, the respective lengths (R1, R2) of the front tip blade (3) and the rear tip blade (4), and the anhedral angle (&eegr;) of the rear tip blade (4) are determined so that tip vortices generated by the front tip blade (3) and the rear tip blade (4) cancel each other to suppress BVI noise.

Abstract: A blade for a rotary wing aircraft includes a blade tip winglet intended to reduce the blade-vortex interaction noise during descending flight. The winglet has, in plan view, an at least approximately trapezoidal shape, and the mean value of a chord C.sub.1 of the winglet is between 25% and 40% of a chord C.sub.0 of the main part of the blade. Compared with a conventional rectangular tip, and for the same aerodynamic thrust, the reduction in noise associated with use of the blade tip winglet can be as much as 40%.

Abstract: A windmill having a plurality of radially extending blades, each being an aerodynamic-shaped airfoil having a cross-section which is essentially an inverted pan-shape with an intermediate section, a leading edge into the wind, and a trailing edge which has a flange doubled back toward the leading edge and an end cap. The blade is of substantial uniform thickness. An air compressor and generator are driven by the windmill. The compressor is connected to a storage tank which is connected to the intake of a second compressor.

Abstract: A sail has a main sheet mounted to a mast; a leading vane on the other side of said mast from said main sheet and pivotally connected thereto; a trailing vane attached to the longitudinal edge of said main sheet remote from said mast; and an angled dual-lip member pivotally attached to the trailing edge of said trailing vane and wind spill plates to capture the air in the envelope of the sail.

Abstract: In an axial fan having a plurality of blades (2, 2, . . . ) around an outer periphery of a hub (1), a cross-sectional configuration of each of the blades (2) at an arbitrary distance from a center of the fan is set such that a blade thickness gradually increases moving away from a blade leading edge (2a) and then gradually decreases towards a blade trailing edge (2b). Also, if a length of a camber line extending from the blade leading edge (2a) to a position where the blade thickness becomes maximum is taken to be L, and a length of a camber line extending from the blade leading edge (2a) to the blade trailing edge (2b) at the arbitrary distance is taken to be L.sub.0, then L/L.sub.0 falls within a range of 0.27 to 0.35. Thus, the aerodynamic performance never lowers even if the inflow angle of air into the blade (2) varies.

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: A propeller used to interact with a fluid to either move the fluid, e.g., a fan or generate thrust for propulsion, e.g., for an aircraft or boat. The propeller is characterized by at least first and second planar blades configured for mounting on a propeller shaft. Each of the planar blades defines a periphery including (1) a trailing edge lying substantially in a common plane oriented perpendicular to the propeller shaft and (2) a leading edge inclined at an angle of A.degree. relative to the common plane so that the midpoint of the leading edge is axially displaced, relative to the propeller shaft, from the midpoint of the trailing edge.

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 turbine blade includes a hollow airfoil extending from an integral dovetail. The airfoil includes sidewalls extending between leading and trailing edges and longitudinally between a root and a tip. The sidewalls are spaced apart to define a flow channel for channeling cooling air through the airfoil. The tip is tapered longitudinally above at least one of the sidewalls and decreases in thickness.

Abstract: A blade for an axial fluid machine comprises an effective blade portion having a root portion and a tip portion and projecting blade portions. The projecting blade portions are defined by axis reference lines extending to an upstream side with respect to a fluid flow from at least one of the root portion and the tip portion of the effective blade portion and by axes obliquely extending from ends of the axis reference lines toward a leading edge of the effective blade portion. The projecting blade portions are formed continuously to and integrally with the leading edge of the effective blade portion so that the effective blade portion and the projecting blade portions have substantially the same maximum blade thickness.

Abstract: This invention provides a compact, flat axial fan which is not limited by the shape of an incorporated rotor magnet and ensures a sufficiently large air flow and wind pressure, wherein the slide (under) piece of a mold that forms the under-molding portions of the vanes of the impeller of the axial fan is pulled out while being twisted (while performing a helical motion) in the direction of central axis of the base portion of the impeller, so that the mold can be formed simple to realize a multi-cavity mold, and the vanes can be formed into an ideal form by setting vane angles depending on different rotating peripheral velocities of the vanes, so that air can be supplied form the under-molding portions of the vanes to the vanes on the outer circumferential side during rotation of the impeller and a method of manufacturing an impeller for the axial fan.

Abstract: A high aspect ratio, low solidity fan blade of an axial flow air cycle machine has a local tip center of gravity axis that has been shifted ahead of an elastic axis. The center of gravity axis can be shifted by clipping the tip of the blade at the trailing edge, by undercutting a rear portion of the pressure surface, or by sweeping forward leading and trailing edges of the blade by about five degrees (without clipping or undercutting the blade).

Abstract: A fan blade having a flow bumper curved backwards at a front side thereof, a mouth on the middle for gathering currents of air, a flow guide obliquely forwardly extending from the flow bumper at a top side above the mouth, and a rack and a mounting board vertically disposed at a rear side thereof for connection to a hub of a fan motor. The invention also provides a ceiling fan which has air guide means for guiding outside fresh air in for circulation upon operation of the ceiling fan.

Abstract: An axial flow fan assembly including a housing, a stator, a motor supported by the stator, and a fan rotatably mounted on the motor. The stator is connected to the housing at an outlet end thereof, and includes a stator hub and a plurality of stator vanes each extending radially inwardly and axially downwardly from the housing. Each stator vane is connected at its inner tip to the stator hub. The motor is positioned within the housing and is supported by the stator hub. The fan is secured to the shaft of the motor, and includes a fan hub and a plurality of fan blades extending substantially radially outwardly from the fan hub. The particular configuration of the stator vanes allows the entire length of the motor casing to be encompassed between the inlet of the housing and the stator hub, which in turn provides a substantial reduction of the overall axial height of the fan assembly.

Abstract: An aerodynamic-shaped fan blade for use in a fan apparatus. The blade has a cross-section which is essentially an inverted pan-shape with an intermediate section, a leading edge section, and a trailing edge section which form concave and convex surfaces. The trailing edge has a flange doubled back toward the leading edge within the concave envelope.

Abstract: The invention relates to an impeller (1) for a mass flow measuring device receiving inflow of material through an inlet tube (6), the impeller comprising a bottom plate (4), an upper plate (5) and vanes (3) extending between the lower and upper plates. An inner edge (7) of the vanes (3) is continuously or successively rising from the center (9) of the impeller (1), or the vicinity thereof, towards the outer edge (R.sub.1m) of the inlet tube (6), and that the vanes (3) are provided with a continuously or successively rising outer edge (14) corresponding to an increase of the radius of the impeller from the radius (R.sub.2) of the bottom plate (4) to the radius (R.sub.xm) of the upper plate (5).

Abstract: A fan blade includes a metal airfoil having first and second opposite sides extending radially between a root and tip, and axially between a leading edge and a trailing edge. The airfoil further includes a plurality of pockets disposed in the first side and separated by corresponding ribs. A filler is bonded in the pocket, and is coextensive with the airfoil first side. Radial and diagonal ribs respectively intersect solely each other for selectively increasing torsional and bending stiffness to increase frequency margin between adjacent torsional and bending resonant modes of vibration.