Abstract: A siroco fan of a window type air conditioner, in which the rotational speed can be increased without changing the quantity of the blowing air and without increasing the operational noise, thereby improving the marketability of the air conditioner. The siroco fan has a shroud and a plurality of blades disposed at the shroud and spaced apart at regular intervals, each of the blades having a trailing edge angle of 125° to 137°, a leading edge angle of 58° to 63°, a chord-to-pitch ratio of 0.75 to 0.85, an inner diameter-to-outer diameter ratio of 0.82 to 0.86, and a maximum camber position of 0.3 to 0.4.

Abstract: A complex cooling fan includes an upper fan including an upper fan and a lower fan, the upper fan including a first cylindrical body, a plurality of first blades extending outwardly from the cylindrical shell body, and a cylindrical collar extending downwardly from the first cylindrical shell body, the cylindrical collar having a smaller diameter than the first cylindrical shell body, a lower edge of the first cylindrical shell body being formed with a positioning notch, and a lower fan including a second cylindrical shell body and a plurality of second blades extending outwardly from the second cylindrical shell body, the second cylindrical shell body having same outer diameter as the first cylindrical shell body and having an upper edge formed with a protuberance configured to engage with the positioning notch of the first cylindrical shell body, an inner diameter of the second cylindrical shell body having same size as an outer diameter of the cylindrical collar, the cylindrical collar being fitted into th

Abstract: A novel drive for a lifting platform utilizing a simple propeller, impeller, or gas turbine is disclosed. The axial air rotation from the drive is eliminated in order to permit the development of a partial toroidal vortex which efficiently maintains a raised air pressure zone beneath the lifting platform. The axial components are eliminated by means such as flow straightening vanes, which may also serve to control lateral motion of the lifting platform. The system can also be easily modified to function as an attractor device. Overall, the present invention explores the effect of vortices, both cylindrical and toroidal, and seeks to optimize their effects.

Abstract: This invention relates to a fan. According to the rotational direction, the outermost point of the front side of the fan is leading to the innermost point of the front side such that the portion first contacting air is minimized and the noise of the fan is minimized. According to the rotational direction, the back of the fan blade recesses from the inner side and outer side of the fan blade to the center of the fan blade. According to the rotational direction, the frontage of the fan blade convexedly protrudes from the inner side and outer side of the fan blade to the center of the fan blade. The wake side is rounded. The diameter of the top side is smaller than that of the peripheral wall of the center portion. The invented fan improves noise, air flow and wind pressure.

Abstract: An improved pump impeller using both spaced disc stack and radial vanes to establish pumping, the vanes separated to form a circumferential array of convergent spaces. The vanes may be of increasing thickness towards their outer ends to create the convergent spaces, or a cover plate may have a sloping inside surface to accomplish the space convergency.

Abstract: The invention relates to an impeller being rotated around an axis for a mass flow measuring device receiving inflow of material through an inlet tube. To improve the measurement accuracy, the fan character of the impeller is reduced. This is obtained by two design principles which can be combined. The impeller includes a number of mainly radially directed vanes. That side of each vane along which the measured material flows is formed as a duct with a cross-sectional area which decreases in the direction from the center of the impeller. The other principle is to reduce the airflow by use of an upside down bowl shaped cowling placed over the impeller.

Abstract: An air pump includes a housing having a top formed with a circular recess, a first semi-cylindrical member in communication with the circular recess, and a first curved baffle arranged close to the first semi-cylindrical member, an electric motor mounted within the housing and having an output axle extending upwardly out of the center through hole, a bottom cover engaged with a bottom of the housing by retainers, a centrifugal impeller eccentrically fitted in the circular recess so that there is a circular passage between the centrifugal impeller and an inner wall of the circular recess, an upper cover configured to engage with the circular recess to cover the centrifugal impeller and having a conical portion disposed above the centrifugal impeller thereby forming a passage therebetween, whereby the air pump can provide sufficient air pressure to inflate an object in a short time.

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

Abstract: A radial flow fan wheel has a longitudinal axis and consists of an annular member and a plurality of first and second blade members. The first and second blade members depend from the annular member substantially parallel to the axis of the first blade members being disposed on a first pitch circle and the second blade member being disposed on a second pitch circle which has a radius less than a radius of the first pitch circle.

Abstract: An impeller has a plurality of rotating passageways which can be defined between adjacent blades, the blades having a curved root portion and able to pivot across a part spherical hub to maintain a fine line contact. The passageways have a convergence to improve the efficiency of the impeller. The hub can be split into two relatively rotating portions, with the blades attached to each portion to provide an efficient means to vary the pitch of the blades.

Abstract: A non-metallic pump for pumping molten metal includes a motor, a shaft having one end connected to the motor and an impeller connected to the other end of the shaft. A base has a chamber in which the impeller is rotatable. Structure is used to removably insert the base into a bath of molten metal. The impeller includes stirrer openings which are configured and arranged to enable the impeller to cause solid matter in the molten metal to move toward an upper surface of the bath.

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

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

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

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

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

Abstract: An impeller for a submersible radial pump has an impeller disk which is formed with a pair of blades on a side thereof opposite the boss. The leading end of one of the blades is thicker than the leading end of the other blade to reduce the possibility that pieces of fabric or the like will hang up on the blades in operation of the pump.

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

Abstract: A pressure boost impeller configured for compressing fluids, such as gases and liquids. Such impeller has a front intake area and a rear discharge area, and a hub containing the rotational axis of the impeller. Several blades extend about the hub, with some of the blades being in an overlapping relationship to define a passageway between adjacent blades. The passageway has an inlet communicating with the front intake area and an outlet communicating with the rear discharge area. The inlet is greater in area than the outlet, thus defining a step down in volume of fluid passing through the passageway.

Abstract: In a non-metallic pump for pumping molten metal including a shaft, a motor at one end of the shaft, an impeller at the other end of the shaft, and a base having a chamber in which the impeller is rotatable, the improvement being a dynamically balanced impeller comprising a cylindrical center hub and five vanes extending outwardly from the hub, wherein the vanes are equally spaced around the periphery of the hub.

Abstract: A molten metal pump having an elongated shaft with an impeller disposed adjacent the end of the shaft and a means for rotating the shaft. The impeller is formed with an imperforate substantially circular base surrounded by a bearing and has a surface facing toward the shaft. At least two imperforate vanes are connected to and extend substantially perpendicular from the surface and radially from the shaft or a hub securing the shaft toward a peripheral portion of the base. The vanes are spaced apart at terminal inlet ends along their entire radial dimension to create an inlet area comprised of the axial opening between adjacent vanes at the terminal ends and an outlet area comprised of a radial opening between adjacent vanes along the axial direction of the vanes. Each vane has a leading edge with a distal portion adjacent the periphery of the base portion which forms an angle of less than about 100.degree. relative to a tangent to said circular base drawn at the center of the vane.

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

Abstract: A molded impeller fan assembly has a backing plate and a plurality of blades extending generally orthogonally upwardly therefrom. A V-shaped buttress is formed at the transition of each blade to the backing plate. Each buttress is defined by a pair of opposed walls which are formed where the backing plate curves gradually upward toward the blade apex. A V-shaped indentation is disposed between the walls in a side of the backing plate opposite the blades. The walls of the buttress serve to transfer centrifugal and impact forces from the blades to the backing plate.

Abstract: Evaporative cooler apparatus includes two pumps, a primary pump which pumps water to an evaporative medium and a secondary pump for pumping water from the bottom of the cooler to drain the cooler. The secondary, or drain pump includes a timer so that it is only on to drain water from the bottom of the cooler for a predetermined time, and after a predetermined number of hours of operation of the primary pump. That is, there is a direct relationship between the operation of the cooler apparatus as evidenced by the primary pump, and the draining of the water at the bottom of the cooler by the secondary, or drain pump. The efficiency of the pumps is increased to allow them to pump with a very low water level without cavitation problems by virtue of an impeller design which includes vanes on the bottom of the impeller disk and vanes on top of an impeller disk.

Abstract: A lightweight, heavy duty, large volume centrifugal compressor for use in mechanical vapor compression systems, especially water vapor compression systems in heat pump installations, said compressor comprising a shaft driven propeller-like rotary member consisting of a frusto-conical hub and a plurality of curved blades made of a lightweight material, each being secured to said hub along a longitudinal curved line and radially extending therefrom; each pair of adjacent blades being interconnected by a bridging membrane member of a lightweight material curvingly extending from the roots of the leading edges of said adjacent blades to the tips of the rear edges of the blades; said rotary member being encompassed within a closely fitting shroud, so that curved vapor flow channels are defined between each said pair of blades, their associated membrane member, and the shroud.

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

Abstract: A molten metal pump including a vaned impeller having a larger outlet area than inlet area which demonstrates prolonged high effectiveness and reduces the likelihood of catastrophic failure.

Abstract: A refrigerant or coolant compressor of the radial type with an impeller hng a plurality of vane elements can be used for compressing water vapor as a refrigerant or coolant under vacuum conditions. The impeller of the compressor is constructed to produce a high volume flow rate at the required compression ratio, in view of the low density of water vapor as the preferred flow medium. The impeller has sufficient strength to operate at the required high circumferential velocities. The impeller includes vane elements, disk elements, vane support elements and a hub. The vane elements are individually connected to the hub by the support elements. The support elements may be either ring-shaped elements connecting a rear surface of the disk elements to the hub, or may be pin-shaped insert members connecting the root of each vane element to the hub. The components of the impeller are made of a polymer composite material reinforced preferably with carbon fibers.

Abstract: A propulsion device comprises a circular series of inclined airfoil elements. Each airfoil element is connected along its lower 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 inwardly of the circular series, and their pressure surfaces face downwardly and outwardly of the circular series.

Abstract: A circular foil connectable to a source of power for producing thrust in an axial direction when rotated, includes a flat circular plate and a plurality of closely spaced-apart fins fixed to an upper face of the circular plate, which occupy substantially the entire peripheral portion of the plate. A cylindrical hoop is fixed to the plate adjacent to radially inwardly extending edges of the fins to prevent fluid disposed adjacent to the circular plate and radially inwardly of the fins, from flowing radially outwardly and into the space between the fins as the circular foil is rotated. The foil is rotated at a sufficient speed to discharge fluid molecules from spaces between the fins at a rate faster than they can be replenished. This creates an imbalance of fluid pressure on the first side of the foil relative to an opposite second side thereof. As a result, the circular foil moves in the direction of the deficit.

Abstract: An impeller in a water pump for circulation of cooling medium in a cooling system of an engine has a shroud with a shroud end to which the edges of the blade inlets are attached and which is formed in the cylindrical configuration substantially parallel to the rotary shaft. Each of the edges of the blade inlets is shaped so that it is continuously smooth from a shroud end surface at the inlet side thereof and extends upstream in the axial direction, while each of the edges of the blade inlets at the side of a casing extends substantially perpendicularly to the rotary shaft. The edge of the blade inlet attached to the cylindrical shroud end and the edge of the blade inlet at the casing side being connected therebetween by a smooth arc-like curve projecting convexly upstream. The inlet angle of the blade is set to substantially 0.degree. at the inlet edge at the shroud end and to an angle calculated substantially on the basis of the conventional design at the inlet edge at the casing side.

Abstract: A cooling water pump for a pump housing of an internal combustion engine includes a bearing cover that can be fixed within a bore of the pump housing. The pump also includes a pump shaft and a bearing. The pump shaft is rotatably mounted in the bearing. An impeller and a pulley are each coupled to the pump shaft, and the impeller has an inlet opening that is circular in shape and concentric with the impeller. The inlet opening is disposed at the end of the impeller that faces the pump housing in the axial direction. A first concentrically formed covering covers the impeller and is impermeable to liquids flowing in the axial direction. The first covering is disposed in first zones located radially beyond the inlet opening, and the impeller is open in second zones located on a side of the impeller axially opposite the first covering.

Abstract: The invention relates to a radial-flow wheel for a turbo-engine comprising a hub and blades distributed on the hub-side outer circumference, the meridian section contour of the outer surface of the hub being a catenarian curve. This radial-flow wheel has the advantage of low frictional losses.

Abstract: A pump for Whirlpool and Spa applications has a series wound universal motor which is directly coupled to a centrifugal impeller for operation in the range of 4000 to 9000 RPM. Variable speed of the pump is easily accomplished with a universal motor by varying the voltage to the motor.

Abstract: A pump has an impeller with a circular series of airfoil vanes rigidly mounted thereon. The impeller is mounted in a casing which has a radially outwardly increasing internal axial extent, such that fluid flowing through the pump has a less constricted path peripherally of the pump chamber than centrally of the pump chamber. The vanes are of airfoil configuration and create regions of decreased pressure on their radially inner surfaces and regions of increased pressure on their radially outer surfaces, upon movement of the series of vanes through a fluid. The radially outwardly increasing axial extent of the pump chamber is measured from a front chamber wall to a surface opposite the front chamber wall, and occurs radially inwardly of the path of the vanes from the inlet to the vanes.

Abstract: An apparatus for separating and recovering floating liquid wherein one or more vortex guide plates are horizontally held on the surface of the water inhibiting their rotation, the lower members of the guide plates are submerged under the surface of the water, an enveloping cylinder at the center of vortex has its upper end suitably positioned under the surface of the water and has its lower end submerged deeper than the peripheral guide members, a suction tube for recovery is provided in said cylinder, a rotary impeller is provided under said cylinder in concentric with the vortex guide plates and is rotated in the enfolding direction of the vortex guide plates, and wherein a cylindrical cover is provided between said guide plates and said impeller, said cylindrical cover having an opening in the upper end surface thereof with its diameter being smaller than the diameter of the impeller and further being open at its lower end.

Abstract: An impeller for a centrifugal compressor includes a hub, several main blades mounted to the hub, and several splitter blades mounted to the hub, each splitter blade being located between adjacent main blades and being disposed from a position centered between the adjacent main blades by an amount of about 6% to about 33% of one half the angular distance between the main blades.

Abstract: Apparatus and method for extending the thermal fatigue life and/or improving the performance of radial-flow turbine wheels in gas turbine engines by providing a thickened reinforcing pad on the wheel backface and cooling air passages in the surrounding case structure to direct high velocity cooling air onto the pad.

Abstract: The fan comprises a volute housing (10) in which is disposed a ventilation wheel (11) connected to a driving motor (12). The wheel has a series of vanes (13) extending in a direction roughly parallel to the axis of rotation (X--X) of the wheel from a bowl (14) connecting the vanes to the driving motor to an edge portion (15) of an air intake (16) defining with the bowl a space for a fluid stream. The confronting surfaces of the bowl and the edge portion of the air intake, at least to the inner edges of the vanes, are generated by rotation of parallel sections of curves about the axis of rotation (X--X).

Abstract: A runner type wind turbine designed to utilize maximum of the available energy carried by low speed stream. This turbine has a turbine disc which deflects and discharges a wind stream in radial and parallel direction relative to the disc; a rotor construction permits the disc and its power shaft to be arranged and assembled in a vertical or a horizontal position. The turbine includes a disc, mounted on a shaft located in central guides affixed to an outer stationary turbine stand. The disc mounts a plurality air blade shaped in such a way that the incoming air impinges on the blades radially, circumferentially and outwardly relative to the turbine disc.

Abstract: A single stage centrifugal fuel pump which can provide a large range of flow, 1 to 300 gpm, while maintaining low flow, high speed operation with pressure instability at minimum values comprises a radial-flow impeller having a front shroud and a discharge for discharging fuel from the impeller. A diffuser ring has a throat entrance located opposite and in spaced relation to the discharge of the impeller. The front shroud is provided with an extension which extends into the vaneless space between the impeller discharge and the throat entrance of the diffuser ring thereby reducing the flow at which pressure instability inception occurs.

Abstract: A multi-part molded plastic annular fan is formed from four pieces, each piece having upstanding fan blades and a number of integrally molded cylindrical metal sleeves through which bolts extend to mount the fan parts to a flywheel of an engine drive train. Each fan part has an interlocking member at both ends thereof which secure the fan parts together, and a bolt extends through the interlocking members to secure the fan parts to the flywheel.

Abstract: An impeller forming a unit with the spherical rotor of a sphero-pump consists of a disc with vanes and an inlet member, both made by injection molding from resin. A rotor plate made from a thick gauge sheet metal covers the vanes and is held in position by rivet type protrusions on the inlet member and compensates the weight of the rotor.

Abstract: A rotor member for a turbomachine includes a first portion formed of comparatively higher creep rupture strength material, and a second portion integrally joined to the first portion and formed of comparatively higher tensile strength material. The rotor defines a bore and is configured such that the operative environment thereof inflicts higher temperatures upon the first portion, and higher centrifugally-induced stresses upon the second portion. In order to improve the operating speed, burst margin, or both, of the rotor a plurality of circumferentially spaced and annularly arrayed cavities are provided within the rotor at the union of the two portions. The portions are intimately united by hot isostatic pressing (HIP) so that the rotor is of a single piece (monolithic) having portions of selected physical properties appropriate to the thermal/physical stresses imposed thereon, and defining voids which reduce the weight and bore stresses thereof.

Abstract: The water pump impeller comprises a boss with a disk part shaped thereon and a circular or paraboloid transition region is provided between the boss and the disk part. A metal reinforcing disk is embedded round on either side by injection moulding in the disk part, including the transition region. The reinforcing disk has as a component of the boss, a boss part with which it can be mounted on a drive shaft.

Abstract: A ventilator comprising a rotating plate provided on its lower surface with blades forming a centrifugal turbine surmounting the mouth of a ventilation duct or ducts in whose axis said turbine creates an ascending vortex effect. The aspiration to which the main duct or ducts are subjected is obtained by the rotation of a turbine (4a) comprising a flange (4) and a plurality of blades (10) fastened to lower surface of flange (4). The blades have a trough shape facing away from the direction of rotation of the turbine, the blades having an inner edge that makes an angle of less than 90 degrees with the flange.

Abstract: A portable, self-contained power conversion unit is disclosed that is attached to an outlet for a pressurized fluid system, such as the nozzle for a garden hose. An impeller mounted in the body of the unit and is rotated by the discharge of pressurized fluid through the unit. The rotational energy of the impeller is converted into electrical energy by a generator, and/or used directly in rotating tools attached to the impeller, such as grinding wheels, rotary saws, rotary brushes, drill bits, and the like.

Abstract: The invention concerns a dual-disk fertilizer spreader with two rotationally offset centrifugal disks that are equipped on their top side with followers, each displaying a vertical guide surface directed radially from the center of the centrifugal disk to the periphery of the centrifugal disk and a horizontal guide surface aligned in the direction of rotation of the centrifugal disk, with means being provided in the region of the vertical guide surface that separate and/or conduct the stream of fertilizer in other directions than that of the vertical guide surface.

Abstract: A surgeless combustion air blower which, due to the incorporation therein of an impeller having a novel configuration and blade shape, does not surge under periods of low turn-down, and yet which demonstrates comparable volume capacity as conventional impellers of the same diameter. The novel configuration and blade shape of the impeller inhere in three design features of the impeller: (1) the wheel bears no shroud; (2) a quadrangular inducer appends the leading edge of each blade adjacent the hub, which inducer is bent between 40.degree. and 50.degree., and preferably 45.degree., into the direction of rotation of the impeller; and (3) the blade tapers from a maximum chord immediately down-blade of the inducer to a minimum chord at its tip. In addition, the slope of the inducer-blade interface, or "bend line" of each inducer, opposes the predominant taper of the blade from which it appends.

Abstract: An impeller for a pump, especially a vortex pump, provided with one or more straight or curved vanes arranged radially. Vortex pumps are used e.g. for pumping sewage, for which purpose they are well adapted. However, a drawback with such pumps known so far has been a rather low efficiency and a low lift curve. In the vortex pump of the invention, this problem is eliminated by providing the edges of the vanes with flanges essentially perpendicular to the vane surface.