Abstract: A cross-flow fan, and blades of a cross-flow fan are provided. The cross-flow fan includes a rotary shaft; a plurality of blades that extends in a direction parallel to the rotary shaft and having a positive pressure surface and a negative pressure surface; and a connector that connects the rotary shaft and the plurality of blades. At least one protrusion that protrudes in a thickness direction and extends in a longitudinal direction of the plurality of blades is formed on the plurality of blades, and by means of the at least one protrusion formed on a blade surface, a flow separation phenomenon caused by friction with the blade surface is suppressed, thereby reducing noise generated by the cross-flow fan.

Abstract: The present disclosure provides a centrifugal fan blade, an air treatment device and a fan; the centrifugal fan blade includes a hub and a plurality of fan blades; the plurality of fan blades are distributed around the periphery of the hub; each fan blade includes a first blade and a second blade; moreover, the first blade is in a backward blade form; and the second blade is in a forward blade form. The centrifugal fan blade can improve the flowing of the airflow and improve the air output efficiency.

Abstract: A centrifugal blower includes an impeller and a casing having an air intake portion. The air intake portion has a bell mouth lower end portion that includes a downstream end, and a bell mouth inner surface portion that includes a radially inner surface. The shroud has a shroud upper end portion that includes an upstream end, and a shroud inner surface portion that includes a radially inner surface. The bell mouth lower end portion and the shroud upper end portion face each other in the axial direction across a gap. A difference between a diameter smallest in the bell mouth inner surface portion and a diameter smallest in the shroud inner surface portion is equal to or smaller than a thickness of the shroud. A vertical vortex generating mechanism configured to generate a vertical vortex is provided on the bell mouth inner surface portion.

Abstract: A centrifugal fan assembly comprises a blade assembly integrally formed. The blade assembly comprises a plurality of blades integrally formed, wherein each blade of the plurality of blades has a twisted shape with a first portion of a hub end of the each blade facing a first adjacent blade, and a second portion of a outer end of the each blade diagonal to the first portion of the hub end facing a second adjacent blade, a fixing portion integrally connected to the blades. The centrifugal fan assembly comprises at least one opening formed in the fixing portion and a hub plate comprising a recessed portion and a convex portion enabled to couple to the blade assembly. The concave portion is provided to correspond to a shape of the fixing portion and the convex portion is provided to correspond to a shape of the at least one opening.

Abstract: A fan blade structure of a convection fan includes a fan blade body. The fan blade body includes a central disk secured to the rotating shaft of the motor and multiple blades evenly distributed in a circumferential direction of the central disk. The fan blade body further includes an outer edge frame, the outer edge frame is connected to an outmost side of each of the blades in a radial direction of the central disk. The outer edge frame is connected to an outmost side of the blade in the radial direction of the central disk through the outer edge frame, which makes all the outmost sides of all the blades secured to the outer edge frame, thus the stability of the blade is strengthened, blade deformation in harsh environments is avoided, thereby the balance performance of the fan blade is improved, and the vibration or noise is reduced.

Abstract: A cross-flow fan made of resin includes first and second fan blocks joined together. The first fan block includes a first support plate, plural first blades connected to the first support plate, and a first outer peripheral ring having a first ring portion that interconnects outer ends of the plural first blades. The second fan block includes a second support plate, plural second blades having second one-side distal ends connected to the second support plate, and a second outer peripheral ring having a second ring portion that interconnects outer ends of the plural second blades adjacent second other-side distal ends of the plural second blades. The second other-side distal ends of the plural second blades are joined to the first support plate, and the first support plate and the second outer peripheral ring are disposed adjacent to each other.

Abstract: A centrifugal pump is provided, which includes a rotor assembly, the rotor assembly includes an impeller including multiple blades and a blade fixing portion, the blades and the blade fixing portion are integrally formed by injection molding, and the blades are circumferentially distributed at equal intervals along the blade fixing portion. The blade includes a first side, a second side, a blade top portion and a blade root portion, and the blade root portion and the blade fixing portion are fixed by injection molding. The blade top portion is a cantilever end of the blade, and the first side and the second side are arranged between the blade root portion and the blade top portion. The rotor assembly arranged in such manner can improve the hydraulic efficiency and lift of the centrifugal pump.

Abstract: A centrifugal fan includes: a housing; an impeller which is mounted in the housing; a hub which is provided in the impeller and is rotated by a driving force of a motor; and a plurality of blades which radially extend at the hub. Each of the plurality of blades is formed to have a shape curved from a leading edge to a trailing edge in a rotational direction of the impeller in each of the plurality of blades. A farthest point from a plane connecting the leading edge and the trailing edge is defined as a peak portion. The peak portion is placed closer to the leading edge than the trailing edge.

Abstract: Disclosed herein is a plurality of blades with a three-dimensional shape injection-molded at the same time, thereby reducing processes of manufacturing a centrifugal fan assembly. A centrifugal fan assembly includes a blade assembly formed by integrally injection-molding a plurality of blades where at least a part thereof is bent and a fixing portion, and a hub plate to which the fixing portion of the blade assembly is coupled, where the fixing portion includes at least one opening to allow extraction of the blade assembly from the mold.

Abstract: In one aspect, a fan assembly is provided that can be manufactured while producing a significantly reduced amount of scrap material. More specifically, the fan assembly utilizes a hub ring and one or more hub strips to support a plurality of blades rather than a solid center disc or end disc used by some prior approaches. In another aspect, a method is provided that includes bending a member into an annular configuration and joining end portions of the member together to rigidly fix the member in the annular configuration. The rigid annular member may be used as an end ring, a hub ring, an orifice, or other component, while producing significantly less scrap material than traditional approaches.

Abstract: Each of blades of a centrifugal fan includes a primary wing section that has a trailing edge which is parallel to a central axis of rotation, a leading edge end section which is parallel to the central axis of rotation, and a thickness gradually growing thinner toward the trailing edge and the leading edge end section; and an auxiliary wing section that extends from the leading edge end section of the primary wing section toward the interior of the centrifugal fan. The auxiliary wing section has a length from the leading edge end section of the primary wing section to the leading edge of the auxiliary wing section that is greater at a side of a support section than at an intake side when viewed in a direction of the central axis of rotation, and a constant thickness across the entire area of the auxiliary wing section.

Abstract: A forward curved blower wheel has fan blades having relatively small leading edge blades angles and a relatively lengthy mean camber lines. The blower wheel also comprises leading edge notches adjacent its blower wheel inlet. The leading edge notches eliminate buffeting that would occur with such blades if such notches were not present.

Abstract: The invention relates to a drum rotor wheel for a fan having bulges to accommodate balancing weights. A drum rotor wheel according to the invention has several blades that are curved forward. The blades have a leading edge and a trailing edge. A top disc and a bottom disc are provided on the drum rotor wheel. At least one blade of the drum rotor wheel has a bulge on its leading edge. This bulge minimizes the area of flow separation, as a result of which the magnitude of the flow separation is likewise minimized. In other words, due to the bulge, the efficiency of the drum rotor wheel is increased.

Abstract: A fan includes a plurality of blade portions arranged spaced apart from each other in a circumferential direction, each blade portion having a blade surface including a pressure surface disposed on a rotational direction side of the fan and a suction surface disposed on a back side of the pressure surface. The plurality of blade portions include a first blade portion and a second blade portion different from each other in at least one of an outer peripheral blade tip angle and an inner peripheral blade tip angle, and are provided such that a discrepancy angle is equal among a plurality of the blade portion.

Abstract: A fan includes a plurality of blade portions arranged spaced apart from each other in a circumferential direction, each blade portion having a blade surface including a pressure surface disposed on a rotational direction side of the fan and a suction surface disposed on a back side of said pressure surface. The plurality of the blade portions include a first blade portion and a second blade portion in which when they are rotated around the rotation axis of the fan and overlapped on one blade portion, one of an inner edge portion and an outer edge portion is disposed to be coincident with each other, and the other of the inner edge portion and the outer edge portion is disposed to be displaced from each other.

Abstract: An impeller element includes a plurality of blades disposed along an outer circumference of a circular support plate. Each blade is divided into a plurality of blade sections in a rotational axis direction. At least one of the divided blade sections as a long-chord blade section is configured such that a chord as a line segment connecting a blade outer-circumferential edge and a blade inner-circumferential edge of the blade in a cross section perpendicular to a rotational axis of the blade has a greater length than a chord of another one of the blade sections as a short-chord blade section. The blade inner-circumferential edge of the at least one long-chord blade section having the longer chord protrudes toward the inner circumferential side, relative to the blade inner-circumferential edge of the at least other one of the blade sections as the short-chord blade section having the shorter chord.

Abstract: A centrifugal fan includes an impeller, and a lower casing provided below the impeller. The impeller includes an upper shroud having an upper portion formed with an inlet, a lower shroud, and a plurality of blades arranged along a circumference direction between the upper shroud and the lower shroud. The blades extend from an inner side area to an outer side area in a radial direction, and are only connected to the lower shroud with the inner side area such that at least an outer circumferential side portion of each blade faces an upper surface of the lower casing. A surface of the lower casing, which faces the impeller, configures a portion of a wall surface which guides the fluid introduced from the inlet. A surface of each blade at a side of a leading edge portion is formed with a discontinuous portion having a step shape.

Abstract: A cross flow fan and an air conditioner including the cross flow fan, where the cross flow fan includes a fixing member, and a plurality of blades fixed to an upper surface of the fixing member and spaced apart from each other in a circumferential direction. one or more of the blades include a protrusion protruding in a downward direction from a surface of the blade.

Abstract: A cooling system for a machine room of a refrigerator is provided. More particularly, a cooling system for a machine room of a refrigerator is provided, which is capable of cooling the machine room of the refrigerator using a smaller blowing fan in a nacelle-shaped or nacelle duct, which can acquire more air than using conventional fan blades, remarkably reducing noise of the fan and ensuring sufficient space, thereby efficiently cooling the compressor and the condenser installed in the machine room. The apparatus for cooling a machine room of a refrigerator may include a compressor installed in the machine room, a condenser installed in the machine room and connected to the compressor via a connection pipe, and a nacelle duct installed in the machine room that cools the compressor and the condenser by blowing air, the nacelle duct having a central opening.

Abstract: A centrifugal fan includes a main plate that is driven to rotate around a rotational axis, a shroud that is disposed so as to be opposed to the main plate, including an intake port for taking in air, and plural blades that are disposed upright between the main plate and the shroud. An adjacent distance between trailing edges of two adjacent blades is gradually decreased in the direction from the shroud to the main plate, at least from a certain point in the direction from the shroud to the main plate, and further, in each blade, an inclination of a negative pressure surface of the blade that extends from the main plate toward the shroud is smaller at least in the vicinity of the trailing edge than an inclination of a pressure surface of the blade that extends from the main plate toward the shroud.

Abstract: A vertical axis wind turbine comprising blade(s) characterized in an airfoil cross section, wherein the top end and the bottom end of said blade(s) are rotationally off-set from each other, twisted up with a vertical line vertical to the horizontal plane.

Abstract: A cross flow fan and an air conditioner having the same are provided. The cross flow fan may include a fixing member having a plate shape, and a plurality of blades fixed to one surface of the fixing member. The plurality of blades may be arranged spaced apart from each other in a circumferential direction. An inner edge may define an end of a side of each of the plurality of blades, the inner edge extending toward a rotational shaft of the plurality of blades, and an outer edge may define an end opposite to the inner edge. A protrusion may protrude from the outer edge in one direction.

Abstract: Vertical axis wind turbine and horizontal wind turbine each with a rotary wing assembly that has helical swept wings whose free ends each have a spoiler. The vertical axis wind turbine has permanent magnet discs for levitating static weight of an entirety of the rotary wing assembly via magnetic repulsion. There is a hub or affixing the permanent magnet discs within a frame structure in a manner that counteracts both a coefficient of friction (“COF”) associated with rotation of the rotary wing assembly and ensuing bearing wear imparted from the rotary wing assembly. The horizontal axis wind turbine has collapsible telescoping towers.

Abstract: The invention relates to a radial blower for delivering an air flow, having a drive motor, having a motor holder and having a fan impeller which has a hub bell at least partially overlapping the drive motor, wherein the fan impeller can be driven by the drive motor via an axially running shaft, wherein a surface, which faces toward the fan impeller, of the motor holder has flow-manipulating elements.

Abstract: In one aspect, a fan assembly is provided that can be manufactured while producing a significantly reduced amount of scrap material. More specifically, the fan assembly utilizes a hub ring and one or more hub strips to support a plurality of blades rather than a solid center disc or end disc used by some prior approaches. In another aspect, a method is provided that includes bending a member into an annular configuration and joining end portions of the member together to rigidly fix the member in the annular configuration. The rigid annular member may be used as an end ring, a hub ring, an orifice, or other component, while producing significantly less scrap material than traditional approaches.

Abstract: A centrifugal fan rotor includes radial blades extending from a disc support connectable to a hub for connection to the rotor's shaft. The blades are produced by stamping metal sheet, each having a corresponding blade surface and opposite attachment projection to the disc support. The rotor includes at least a first group of the blades in which each blade of the first group is provided with respective attachment projections upstream of the corresponding blade surface with respect to a direction of rotation of the rotor, and at least a second separate group of the plurality of blades in which each blade is provided with respective attachment projections arranged downstream of the corresponding blade surface with respect to rotation direction, such that each blade of the first and second groups are mirror-symmetrical to each other with respect to a radial center plane of symmetry between the blades extending through rotation axis.

Abstract: In one aspect, a fan assembly is provided that can be manufactured while producing a significantly reduced amount of scrap material. More specifically, the fan assembly utilizes a hub ring and one or more hub strips to support a plurality of blades rather than a solid center disc or end disc used by some prior approaches. In another aspect, a method is provided that includes bending a member into an annular configuration and joining end portions of the member together to rigidly fix the member in the annular configuration. The rigid annular member may be used as an end ring, a hub ring, an orifice, or other component, while producing significantly less scrap material than traditional approaches.

Abstract: A radial fan wheel arrangement includes a circular bottom plate (2) and a circular cover plate (3) with a central inflow opening (4), as well as wheel blades (6) running between the bottom plate (2) and the cover plate (3). Pocket-shaped recesses (9) are configured at least on one side of a plate surface in the space between the wheel blades (6) in an outer edge area of the cover plate (3) or the bottom plate (2) or both. At least one counterweight (13) is mounted on at least one of the two plates (2, 3) on a plate edge in an area of the pocket-shaped recesses (9).

Abstract: A method for forming an inclined-blade blower wheel is provided by arranging a plurality of blades about respective circumferences of first and second end caps. The plurality of blades extend longitudinally between the first and second end caps and parallel to an axis defined by respective centers of the first and second end caps. The first end cap is rotated with respect to the second end cap a predetermined amount, therein skewing the plurality of blades at a desired longitudinal pitch between the first end cap and second end cap. The first end cap and second end cap are then rotated in unison while crimping the circumferences of the first end cap and second end cap, therein securing the plurality of blades to the first and second end caps and fixing the desired longitudinal pitch of the plurality of blades from the first end cap to the second end cap.

Abstract: A vertical axis turbine and method of making same is disclosed. The device and method comprise a plurality of blades rotatably disposed around an axis of rotation at a plurality of blade locations, each blade being twisted at a first angle about its longitudinal axis, each blade having its distal ends located a predetermined distance from the axis of rotation, each blade being bent at one or more central locations along the longitudinal axis so the one or more central locations are the same predetermined distance from the axis of rotation as the distal ends, each blade having a foil cross section perpendicular to the axis of rotation for maintaining unidirectional rotation of that blade about the axis of rotation in a fluid flow, and each blade having its longitudinal axis tilted at a second angle with respect to the axis of rotation.

Abstract: A blower wheel for use in a blower assembly is disclosed, wherein the blower wheel includes a hub, a concentrically arranged outer ring, and an array of spaced apart blades arranged on an outer periphery of the hub and extending between the hub and the outer ring. The hub includes a wave configuration formed therein. The wave configuration includes an annular array of crests and an annular of troughs alternately formed in at least one of an outer surface and an inner surface of the hub. The hub may also include an annular array of support members formed on the inner surface thereof.

Abstract: A cross flow fan achieves low power input and low noise level by preventing flow separation on an air inlet side and reducing a maximum air velocity in the gap between the blades. At least one of units constituting a cross flow fan is an appearance unit configured such that when the unit is sequentially cut in a direction from one of rings to the other ring along a plane whose normal coincides with a rotation axis, a region S and a region C appear, the radius of a second circle, serving as an inner circumferencial circle (having a radius), in the region S being a first radius of predetermined length, the radius of the second circle, serving as the inner circumferencial circle, in the region C being a second radius shorter than the first radius.

Abstract: A cross-flow fan includes a plurality of fan blades provided to be circumferentially spaced apart from each other. The fan blade has an inner edge portion arranged on the radially inner side to/from which air flows in/out, and an outer edge portion arranged on the radially outer side to/from which air flows in/out. Fan blade has a blade surface extending between the inner edge portion and the outer edge portion. The blade surface includes a pressure surface arranged on the rotation direction side of the cross-flow fan and a suction surface arranged on the back side of the pressure surface. When cut along a plane orthogonal to the rotation axis of the cross-flow fan, the fan blade has a blade cross-sectional shape in which a concave portion concave from the pressure surface is formed.

Abstract: A rotary, fluid-flow-to-mechanical/electrical power-conversion device including a generally cup-shaped, squirrel-cage rotor having a rotational axis, and including plural, circumferentially spaced, elongate, transverse-cross-sectionally arcuate airfoil (fluid-foil) blades sized and disposed about the rotational axis of the rotor with their respective long axes substantially paralleling the mentioned rotational axis. Blade-related dimensions and spacings are chosen whereby the ratio of blade-to-blade circumferential spacing a to blade transverse chord length b is characterized as one which: (a) resides in the general range of about 0.24 to about 0.4; or (b) resides, more preferably, within the somewhat narrower subrange of about 0.25 to about 0.35 within the mentioned general range; or (c) has, even more preferably (for use in many if not most circumstances), a value of about 0.33.

Abstract: Centrifugal impeller (14) of centrifugal air blower (1) has main plate (15); a plurality of blades (18); ring-shaped plate (20); and a cylindrical wall (22). The blades (18) are circumferentially disposed on the side of the outer periphery of front side (17) of main plate (15). Ring-shaped plate (20) is attached to tip sections (19) of blades (18). Cylindrical wall (22) is disposed on the back side (21) of the main plate (15) so as to be concentric therewith. The structure above provides centrifugal impeller (14) and centrifugal air blower (1) with improved air-blow efficiency and noise-reduced operations.

Abstract: In one aspect, a fan assembly is provided that can be manufactured while producing a significantly reduced amount of scrap material. More specifically, the fan assembly utilizes a hub ring and one or more hub strips to support a plurality of blades rather than a solid center disc or end disc used by some prior approaches. In another aspect, a method is provided that includes bending a member into an annular configuration and joining end portions of the member together to rigidly fix the member in the annular configuration. The rigid annular member may be used as an end ring, a hub ring, an orifice, or other component, while producing significantly less scrap material than traditional approaches.

Abstract: A multi-blade fan including a spirally-shaped casing having an inlet and an outlet; an electric motor disposed inside the casing; a main plate provided perpendicular to a rotation axis of the electric motor and having a ventilation hole; first blades disposed at a side of the inlet of the main plate; and second blades disposed at an opposite side of the inlet of the main plate. Herein, a diameter of the main plate is smaller than an outer diameter of the first and second blades and is larger than an inner diameter of them. Furthermore, an outlet angle of any one or both of the first blade and the second blade is sequentially changed in an axis direction.

Abstract: Drag-type wind turbine blades for wind-driven electricity generators are vertically provided between plates of the generator. The wind turbine blades have a plate-like structure with a fin-shaped surface. The turbine blade comprises a wind receiving side consisting of a base section, a base concave-shaped wind receiving section, a convex-shaped wind streaming section, and a wind streaming side of a convex-shaped surface extending in a radiation direction on the back of the wind receiving side. The base end of the wind receiving side and the connecting side comprise an inverse parabolic concave-shaped connecting section to connect it to the base section of the wind streaming side.

Abstract: An impeller of a blower is disposed with circular support plates that are made of a resin and rotate about an axis of rotation and a plurality of blades that are made of a resin. The blades are disposed on outer peripheral portions of the circular support plates so as to be parallel to an axis of rotation, and serrated shapes are formed on the blades by cutting out blade tips at plural places. Additionally, a step is formed in a blade face of each of the blades at a position a predetermined distance from the blade tip where the serrated shape is formed.

Abstract: A blower wheel comprising a centerdisk comprising a conical portion (16), a planar portion (160) for receiving a hub (7), and an arcuate portion (15) intermediate the conical portion and an outer portion (14), a plurality of blades (2) connected to the outer portion, the blades further connected to a ring (3), and a hub connected to the planar portion, the hub comprising a fastener (13) for attaching the centerdisk to a shaft (200).

Abstract: The present invention includes improvements to cross-flow fans and cross-flow fan propelled aircraft including improved control, a dynamically adjustable vortex wall and internal housing, a vortex tube, vertical takeoff and landing rotorcraft configurations, the inclusion of an optimized oscillating blade fan, a wavy vortex wall, power plant refinements, dual leading and trailing edge configurations, stability improvements, tip plates, tapered wings, tapered fans, a fan construction method, and underwater applications.

Abstract: A wind turbine system includes a turbine having a plurality of semi-cylindrical vanes supported in a cylindrical array by rotatable top, center and bottom plates. The supporting plates are joined to a center shaft which in turn is rotatably supported. A plurality of alternators are driven by the center shaft through a pulley and belt arrangement. The vanes are positioned at the periphery of the cylindrical array and occupy less than one-third of the radial distance of the support plates.

Abstract: A centrifugal fan includes a plurality of blades, a first wall disposed at first axial ends of the blades, and a second wall disposed at second axial ends of the blades and having a shaft portion at a center. At least one of the first wall and the second wall has a cutout portion configured to control balance.

Abstract: According to embodiments of the invention, an impeller includes a hub, and a plurality of radial blades for drawing the air inflow axially through the hub and delivering the drawn air radially towards the outside. A ring is attached to one or more tips of the plurality of radial blades to block a portion of the tip toward the inlet side of the impeller. The preferred blockage factor, which is the ratio of a height of the ring to a height of the tip, is approximately in a range between 30% and 40%. By blocking a portion of the tip toward the inlet side of the impeller, the low-momentum flow zone toward the inlet side of impeller is blocked, while the high-momentum flow zone toward the back side of impeller is enhanced. As such, the performance of the impeller is enhanced.

Abstract: An impeller structure includes a hub having a central spindle, and an impeller. The impeller has a top connection ring, a bottom connection ring, a pressure-retaining ring and a plurality of blades vertically arranged around the periphery of the hub. A top side outer edge of each blade is connected with a top connection ring, an bottom side of the inner side of the blade is connected with a bottom connection ring, the outer side is connected with the pressure-retaining ring, and a plurality of ribs extend outwards from the bottom edge of the periphery of the hub connecting with the bottom connection ring. A pressure relief hole is provided between the pressure-retaining ring and the bottom connection ring. When air passes through the pressure relief hole, a pressure effect is generated, increasing air pressure and volume of blower, alleviating turbulence. The pressure-retaining ring also reinforces the blade strength.

Abstract: A wind turbine comprising an axis intended for vertical mounting, blades arranged around the axis, and mounting arms. Each blade comprises a substantially symmetric aerofoil and is of substantially straight section lengthwise. The mounting arms are coupled to the axis and extend substantially perpendicular to the axis. Each mounting arm comprises a fairing of aerofoil shape. Each blade is mounted to the axis at both ends on respective mounting arms. The mounting arms of each blade are angularly spaced around the axis such that each blade is arranged rotated at an angle to the vertical in use and one arm leads the other when the turbine is rotating.

Abstract: A resin cross flow fan and a method for manufacturing a resin cross flow fan are provided in which an annealing step can be omitted and the number of circular disks can be reduced, and which provides improved fan strength and air blowing performance. A resin cross flow fan is disposed with a plurality of blades and a plurality of plates. The plurality of blades are annually disposed about a rotation axis. Insertion portions each constituted by a hole or a groove into which each blade is inserted and projecting portions that projects from the periphery of the insertion portions in a direction of the rotation axis are formed on each of the plurality of plates disposed spaced apart in the direction of the rotation axis. Each blade is fixed to the projecting portions by laser welding.

Abstract: A heat dissipating fan structure of a dual motor includes: a base device, having a fan base, and the fan base having a fan motor; a fan, connected and rotated by the fan motor, and the fan having a plurality of vanes; a support frame device, installed at the fan base, and having a frame-fan motor; a frame-fan device, connected and rotated by the frame-fan motor, and having a frame-fan frame, and a plurality wing plates disposed around the frame-fan frame, and the wing plates being disposed around the external periphery of the fan and perpendicular to the vane, so that the plurality wing plates on the frame-fan base can produce an auxiliary airflow to increase the airflow of the fan and give a better heat dissipating effect.

Abstract: The invention relates to a water wheel, preferably an undershot or breast-shot water wheel having a horizontal hub (21), wherein paddle arrangements (15) are provided along the wheel circumference (22) for converting the kinetic and optionally also potential energy of the water stream into a rotational motion of the water wheel, wherein the paddle arrangements (15) comprise at least two paddle blades and the paddle blades have different sizes, characterized in that the outer paddle blade (13) has a greater depth (23) than the further inner paddle blades (14, 16, 17) of the paddle arrangement. The invention further relates to a hydroelectric power plant comprising one or a plurality of such water wheels.

Abstract: A vertical axis turbine and method of making same is disclosed. The device and method comprise a plurality of blades rotatably disposed around an axis of rotation at a plurality of blade locations, each blade being twisted at a first angle about its longitudinal axis, each blade having its distal ends located a predetermined distance from the axis of rotation, each blade being bent at one or more central locations along the longitudinal axis so the one or more central locations are the same predetermined distance from the axis of rotation as the distal ends, each blade having a foil cross section perpendicular to the axis of rotation for maintaining unidirectional rotation of that blade about the axis of rotation in a fluid flow, and each blade having its longitudinal axis tilted at a second angle with respect to the axis of rotation.