Showing papers on "Impeller published in 1980"

Hydrodynamic bearing system for a brushless DC motor

Abstract: A hydrodynamic bearing system for a motor. The motor is illustrated and described as driving a pump for an artificial heart. The motor stator has a cylindrical bore which is closed at one end. The rotor is slidable and rotatable in the bore. The rotor has affixed to its shaft an impeller with its outside diameter concentric to the rotor outside diameter. Both rotor and impeller are supported hydrodynamically such that the tendency is for the entire rotor/impeller assembly (the only moving element) to be completely suspended by fluid. The rotor can be rapidly reversed to provide heart pumping action or can be driven unidirectionally for artificial heart pumping action of another type. The fluid cannot easily escape from the closed end of the stator, thereby providing a dashpot effect which tends to keep the rotor from changing position. In moving away from the closed end, the rotor brings fluid between the end of the rotor and the closed end of the bore to act as a buffer or bearing fluid when reversal moves the rotor toward the closed end.

Distribution of Solids in Stirred Suspensions

Abstract: The homogeneous distribution of solid particles in stirred liquids plays an important role in industrial applications. The solids to be suspended may either be heavier or else lighter than the liquid and be of variable particle sizes and shapes. If the density of the solid material is greater than that of the liquid, it is the function of the stirrer to lift the solid particles from the bottom of the vessel and to distribute them uniformly throughout the liquid. For the design of such mixing systems it is very important to know the minimum impeller speed at which the solid particles become completely suspended. It is relatively simple to determine this critical impeller speed. Measurements of the solids distribution at different vessel heights show that attainment of the lift-off impeller speed is not in itself sufficient to ensure homogeneity of the suspension. Nor does the determination of height reached by the particles, which is a function of the impeller speed, help with the an be done on different tantalum parts to determine the amount of dissolved hydrogen.

Flow Induced Spring Coefficients of Labyrinth Seals for Application in Rotor Dynamics

Abstract: Flow induced aerodynamic spring coefficients of labyrinth seals are discussed and the restoring force in the deflection plane of the rotor and the lateral force acting perpendicularly to it are also considered. The effects of operational conditions on the spring characteristics of these components are examined, such as differential pressure, speed, inlet flow conditions, and the geometry of the labyrinth seals. Estimation formulas for the lateral forces due to shaft rotation and inlet swirl, which are developed through experiments, are presented. The utilization of the investigations is explained and results of stability calculations, especially for high pressure centrifugal compressors, are added. Suggestions are made concerning the avoidance of exciting forces in labyrinths.

Apparatus for purifying molten metal

Abstract: An improved molten metal pump and gas injection apparatus comprising a submersible pump housing 10 enclosing a rotatable impeller 30, an impeller drive 12 supported above the housing and an elongate drive shaft 16 operatively connected to the impeller. Rotation of the drive shaft effects fluid flow between a pump inlet 35 and a pump outlet 44 both being at least partially defined by the impeller housing. A gas injection conduit 54 extends downwardly from a drive motor support platform 20 and includes an output end 54a that terminates near the pump inlet and which is received by a gas inlet collar 58 that defines a venturi 60, coaxial with the axis of the pump inlet. A passage 62 formed in the collar communicates the end of the gas injection conduit with the throat of the venturi so that the gas is injected into the incoming molten metal in an area of low pressure, thereby reducing the gas pressure needed to effect injection.

Portable blower-vacuum unit

Abstract: A portable blower-vacuum unit has an impeller for drawing air axially through a housing air inlet, and for discharging the air centrifugally through a tangential housing air outlet. In a blower mode, a perforate cover plate prevents ingestion of solid material by the impeller. In a vacuum mode, a vacuum conduit connects to the housing in lieu of the cover plate, and a vacuum bag attaches to the air outlet. A mulching blade rotates with the impeller to chop any solid material passing through the housing when the unit is operated in the vacuum mode.

Adjustable vortex pump

Abstract: A vortex pump which has been converted from a centrifugal pump by interposing an annular spacer between the power frame and casing of the centrifugal pump to provide space for a vortex impeller which has been substituted for the centrifugal impeller. An adjustable vortex impeller consisting of a hub portion with an annular flange having a plurality of sets of holes circumferentially spaced thereon, a plurality of vanes each having a plurality of holes in its root portion, and bolts for fastening each of the vanes in a plurality of different positions on the hub by passing through different pairs of aligned holes in the flange and in the roots to provide different impeller diameters while maintaining the discharge angle of the vanes within a small predetermined range. A plurality of sets of vanes of different sizes can be selectively mounted on the hub to further extend the range of impeller diameters.

Analysis of Rotating Stall in Vaneless Diffusers of Centrifugal Compressors

Abstract: Self-excited flow oscillations in radial vaneless diffusers of centrifugal compressors are investigated analytically using the linearized equations of motion for unsteady flows. Solutions of the differential equations are made to satisfy boundary conditions at diffuser inlet and exit which in typical conversion systems represent the coupling between the diffuser and upstream and downstream components. The results indicate that the rotational speed of the stall pattern is dependent on the diffuser radius ratio and the coupling conditions between the impeller and the diffuser. It is shown that the dependence of the onset of the flow oscillations on the diffuser radius ratio is strong if the conditions at diffuser inlet are such that low speed rotating stall patterns are generated in the diffuser. Onset of high speed rotating stall patterns is more affected by the coupling conditions between the impeller and the diffuser than by the diffuser radius ratio.Copyright © 1980 by ASME

Jet stream device

Abstract: Jet stream device consisting of a submersible electrical motor, a pump, a housing, an outlet nozzle and fixing means, in which the motor drives the impeller of an axial pump, located in a necked-down portion of the casing and wherein the smallest cross-section of said necked-down portion coincides approximately with the cross-section of the outlet nozzle, which is positioned behind the necked-down portion and wherein furthermore motor, pump impeller, necked-down portion and outlet nozzle are surrounded by a housing whose width coincides approximately with the width of the outlet nozzle.

Vacuum suction type urinating aid

Abstract: A vacuum suction type urinating aid comprises a urine transport tube connected, at one end, with a urine receiver provided with a urine suction opening to be applied to a urinating region, and connected, at the other end, with a urine tank communicating to a vacuum suction device. The vacuum suction device is provided with a partition and support plate around a motor mounted with an impeller, to fit the motor by the support plate to a casing forming an air passage. The suction and the delivery side of the air passage communicate through the impeller. The casing is internally provided with plural silencing partition plates at the suction side and the delivery side of the air passage to divert the air current passing therethrough.

Hair cutting device

Abstract: A hair cutting device includes a housing defining a passage having an inlet and outlet with a cutter and an impeller between said inlet and outlet A hair directing apparatus is positioned between the cutter means and the impeller to direct the hair to the periphery of the cutter and the inlet is adjustable with respect to the inlet The cutter includes two blades one of which is rotated with an output motor shaft and the other is reciprocated on the output shaft The drive motor is reversible and a heating element can be attached to the outlet to convert the device to a blower-dryer

Power operated surfboard

Abstract: A power operated surfboard which has a raised rear hollow portion (13) at the rear in which is disposed an impeller housing (34) having an impeller (66) therein and a water discharge passage (69) extending rearwardly from the housing. An internal combustion engine (32) is supported above the impeller housing and has a short vertical axis connected to the impeller which rotates about a vertical axis. Surrounding the impeller housing is an exhaust gas housing (33) which communicates with the exhaust gas passage (62) of the engine and with a discharge chamber (75) beneath the floor of the surfboard. The exhaust gas housing is gastight and provides a gas cushion which retards the entrance of water through the discharge chamber into the exhaust passage of the engine, when the surfboard is not being operated. This is aided by a flexible valve (95) disposed at the discharge outlet of the discharge chamber to retard the entrance of water into the discharge chamber. Associated with the exhaust gas discharge and forming a part of a two part chamber is a water inlet chamber (92) which communicates with the intake of the impeller through the floor of the boat and extends over the opening (87) to the impeller to prevent accidental contact with the rotating impeller either by an occupant or by some foreign object. A belly pan (37) has a bottom all (43) disposed between the engine and the impeller housing and surrounds the engine to form an engine compartment. Disposed at the bottom of the engine compartment is a one way valve (105) which permits draining of water or fuel from the belly pan but hinders the access of water into the interior of the belly pan.

Swimming pool cleaner

Abstract: A pop-up cleaner for a swimming pool. The gear housing of the cleaner is removably positioned in a fitting in a circular opening in the floor of the pool. A jet block is mounted on a linear movable hollow tube that rotates with a rotor mounted in the gear housing, which rotor is connected through a reduction gear train mounted in the gear housing to an impeller mounted in a turbine casing on the gear housing. The fitting is adapted to be connected by a conduit to a water pump. When water under pressure is present in the conduit, the jet block projects out the fitting and a stream of water under pressure is directed substantially parallel to the surface of the pool in the vicinity of the cleaner. Water flowing through the cleaner rotates an impeller which through the reduction gear rotates the jet block at a substantially constant angular velocity. When the pump is turned off, the jet block returns into the fitting.

Method and apparatus for pumping large solid articles

Abstract: A pump for pumping large solid articles includes a rotary pump having a plain disc impeller disposed in a substantially cylindrical chamber of a housing with an inlet coaxial of the impeller into the housing and an outlet from the periphery of the chamber with a rotor arranged to provide a substantially unobstructed passage between the inlet past the discs of the rotor to the outlet of the pump. The impeller includes pairs of discs spaced close together for providing increased fluid pressure and pairs spaced apart a distance for providing a passage for the solid articles. The articles are pumped in a fluid medium, such as water, through the pump and maintained suspended during transport from the inlet to the outlet of the system.

Method and apparatus for surge detection and control in centrifugal gas compressors

Abstract: A centrifugal gas compressor having a shrouded rotatable impeller 14 in an impeller chamber 40, and provided with capacity control vanes 30 and a diffuser passage 18 throttle plate 38, is provided with surge control means including a thermistor 50 which senses a temperature rise beyond a predetermined value in the impeller chamber and exterior of the gas flow path through the impeller, and through relay means such as 52, 58 electrically connected to the thermistor 50 operates to change the compressor operation to a nonsurging condition.

Method and apparatus for computing motor speeds for initiating and ending jolt control during gearshift in a drive system using fluid couplings or torque converters

Abstract: In previously known jolt control equipment, it was necessary to know the speed of the turbine of a fluid coupling or hydraulic torque converter driving the automatic transmission. According to the present invention, the turbine speed is assumed to be the same as the impeller or motor speed after the torque transmission through the automatic transmission has been interrupted. Under these conditions, very little slippage in the fluid coupling takes place and the turbine speed is equal to the impeller or motor speed to a sufficient accuracy. The synchronous turbine speed which determines when the jolt control is to be initiated and terminated is computed from the transmission output speed multiplied by the speed ratio between turbine and transmission output in the gear to be engaged.

Wind driven power generator - has flaps on ends of blades given oscillating movement to produce to rotate impeller in and out of wind

Abstract: The generator has an impeller on an axis which may be slightly inclined to the horizontal. Each blade has a flap at its outer end which pivots relatively to the blade. It is linked by a crankshaft to a motor inside the main part of the blade which is excited at the frequency corresponding to the angular speed of the blade. The resulting oscillation of the flaps produces a moment about the vertical axis. This rotates the impeller to turn it into the wind, reduces unbalanced moments on the tower, and turns the impeller out of the wind at high wind speeds.

Fluids mixing apparatus

Abstract: To introduce and mix fluids, particularly gas (air) with liquid, which is called sparging, an airfoil blade impeller is used for pumping the liquid and for introducing the fluid to be sparged into the liquid through holes in the suction surface of the blade The airfoil blades are characterized by camber, thickness and location of holes which result in high stripping efficiency of the gas into the liquid without significant decrease in power use efficiency over conventional sparging systems

Wind-powered impeller-mixer

Abstract: The invention is an energy-saving means for providing turbulence as well as circulation to liquids in a controlled natural purification system for advanced waste water treatment and algae farming. The wind-powered impeller-mixers are used in the algae growing reactors of a controlled natural purification system. The invention consists of a vertical vane type windmill that turns an impeller blade to cause turbulence in waste water being treated. The impeller blade may be geared to operate from a horizontal position to a vertical position to provide circulation movement. A motor-generator hook-up is combined with windmill-impeller system so that generated energy may be stored for use in turning the impeller blade when there is no wind or not enough wind to operate the system. A clutch arrangement is used to disengage the impeller when the algae growing reactor is to be drained.

Radial blowing device for a cleaning arrangement of a harvester thresher

Abstract: A radial blowing device for a harvester thresher cleaning arrangement has at least two blowers each having a double impeller with two sets of blades, two wind passages each extending from a respective one of the impellers, and two partitions each subdividing a respective one of the wind passages into two half passages, so that each of the half passages communicates with a respective one of the sets of blades of a respective one of the impellers, and each of the partitions extends up to the rotor of a respective one of the impellers.

Water-flow-control device

Abstract: A water-flow-control device adapted to be positioned within water systems which are generally used for watering lawns and gardens, as well as for distributing water over larger areas of land such as for agricultural use, whereby the device permits a predetermined amount of water to be discharged in a positive and accurate manner in accordance with the time period for which the device is set, the device comprising a housing having an inlet-flow chamber and an outlet-flow chamber, wherein the inlet chamber includes an impeller and the outlet chamber includes a hinged flow-valve member which closes under both spring action and water pressure, the two chambers being interconnected by a flow passage which is provided with a pressure-release valve. A timing device is connected to the flow valve and is operated by the impeller, the impeller having a mechanism whereby the rate of water flow can be controlled from a low to high range.

Diffuser of centrifugal compressor

Abstract: A centrifugal fluid compressor including a rotatable fluid impeller and a fluid diffuser positioned coaxially around the impeller and comprising a plurality of diffuser vanes each arranged in such a manner that the angular position of the vane with respect to the center axis of the impeller and the distance between the outer peripheral end of the impeller and the leading end of the vane are variable independently of each other.

Rotary impact crusher having a continuous rotary circumference

Abstract: A rotary impact crusher is characterized by a continuous rotary circumference formed by a plurality of plates along the orbit of rotation described by the crusher impeller blades and extending from each impeller blade to each next blade. The impeller blades are secured to the crusher body by a combination wedge means comprising a truncated, thick walled cylinder and a polyhedron with matching inclined planes. Both the plates and the impeller blades are symmetrical in shape, and combination wedge means is located at a point of least stress to each impeller blade.

Rotary flow meter

Abstract: An impeller is rotatably mounted in a housing on the lower end of a sub which is lowered by means of a wire line into a bore hole. The fluid flow in either direction within the bore hole engages and rotates helical vanes of the impeller, which in turn rotates a digital sensing device. A magnetic coupling links the impeller to the sensing device which is sealably secured within the housing. Rotation of the sensing device in one direction produces a digital output signal which is distinguishable from the output signal produced when the sensing device is rotated in the opposite direction. The digital signal is produced by the rotation of a butterfly valve between signal emitter elements and signal receiving elements coupled to a distinguishing logic circuit. The direction of flow of fluids along the bore hole is thus easily detected in a reliable, highly sensitive manner. Further, and regardless of the direction of rotation of the sensing device, a third discrete output signal is produced, which is indicative of the rate of flow of fluid within the bore hole independent of the direction of that flow. Because of the low friction operation of the meter, the threshold velocity of detectable fluid flow is extremely low.

Multi-speed fan assembly

Abstract: Apparatus for rotating a fluid impeller of a centrifugal or axial flow fan, at multiple speeds. A fan is provided with a first and a second electric motor for drivingly rotating a fluid impeller at relatively fast and slow speeds, respectively. The rotor of the first motor directly drives the fluid impeller; the second motor is connected to the impeller shaft of the fan through a belt drive, with pulleys sized to reduce the impeller's rotational speed relative to that of the second motor. Only one of the motors is provided with a start winding. Control means selectively energize the first and second motors, and are operative to energize the one motor long enough to bring the other motor up to operating speed.