Showing papers on "Impeller published in 1972"

Molten metal pumps

Abstract: A pump having a pumping chamber, an impeller shaft enclosed in a shaft bore communicating with the chamber, and an impeller carried on a shaft in the chamber is partially immersed in liquid so that the shaft bore extends down to the chamber from a location above the liquid, and the shaft bore is pressurized with an inert gas to counteract the pressure of the liquid head and the pumping pressure and thereby prevent the liquid from rising in the bore around the shaft.

Impeller replacing device for molten metal stirring equipment

Abstract: In a molten metal stirring equipment comprising a hood, a rotary shaft extending through the hood, an impeller attached to the end of the shaft by means of coupling and a molten metal vessel which is taken in and out below the hood, the impeller replacement device comprises a work floor provided on the hood, openings provided through the hood and the floor through which the impeller passes, a truck movable on the floor to the openings, and a work deck arranged above the opening of the floor.

Liquid-aerating pump

Abstract: A liquid-aerating pump, particularly for fish farms, has an airliquid mixing chamber mounted in a submergible intake and a double vane helical screw impeller structure adjacent to the opening into the pump casing to effect an additional step in combining liquid and air. The pump may be used either standing upright from a foot plate or as a self-propelled craft moving over a predetermined path while aerating the water on which it is floating.

Mass transfer to a rotating fluid. Part II. Transport from the base of an agitated cylindrical tank

Abstract: Mass transfer to the base of an unbaffled cylindrical tank which is agitated by an axially-mounted impeller is studied experimentally and theoretically. Measured local mass transfer coefficients vary with radial position and fall within theoretical bounds derived for the case of a fluid undergoing solid body rotation above the boundary layer on the base. Average mass transfer coefficients and torque delivered to the base are fitted by consistent theoretical expressions, and an empirical correlation is developed for calculating the average liquid phase mass transfer coefficient.

Aerator device and method

Abstract: An aerator device and method of aerating which comprises a hollow-bladed axial impeller means to effect supercavitation below the surface of the liquid and to produce a downward, swirling flow of gas and liquid; means for admitting a flow of gas to and through a first venturi and out through the blades of the propeller; wall means surrounding said blade means for cooperatively forming therewith an effective second venturi adjacent the blades; and means for preventing gas having passed the blades from reentering the blade area before being dissolved in the liquid.

Hydrodynamic device with slipping mechanical clutch

Abstract: A hydrodynamic device having an impeller, a turbine and a clutch for providing a slipping mechanical drive between the turbine and impeller in addition to the normal hydraulic drive therebetween wherein the clutch is engaged with fluid pressure derived from the pressure within the hydrodynamic device and is controlled by a valve operated by thrust on the turbine to maintain a constant speed differential between the turbine and impeller regardless of input torque.

Impeller running clearance adjustment device

Abstract: A centrifugal pump assembly including a housing and an impeller rotatable on a shaft and within the housing to form clearance therewith at the eye side of the impeller, the shaft defining an axis, in which there is provided (a) yieldable means acting to urge the impeller in one direction along the axis and tending to reduce the clearance, and (b) adjustable means acting to block displacement of the impeller in that direction

Regenerative air-cooled gas turbine engine

Abstract: A regenerative air-cooled gas turbine engine, particularly applicable to and adequately clean burning for automotive and like applications requiring small size at a power rating in the 100-400 h.p. range. The engine is characterized by having the compressor, combustor, drive and power turbines, and regenerator all concentric with the longitudinal axis. The cool air supplied from the compressor to the regenerator passes in a tubular shroud-like flow which surrounds all but the compressor end of the engine and thus encloses the hot section of the engine. Cool air direct from the compressor output is ducted to the combustor and pre-mixed with run fuel supplied by a slinger which separately introduces run fuel and start/idle fuel, the pressure of the latter being boosted by a damper bearing acting as a fuel pump. Simplicity and low manufacturing cost are achieved by having substantially all gas flow confining surfaces in the form of surfaces of revolution. Cooling of nozzle vanes and the drive turbine impeller blades by air ducted from the tubular flow allows turbine gas inlet temperatures of 2,200* F. and higher. The regenerator is of the rotary disc type and has low cost, easily maintained non-rubbing seals.

Flow machine for an aggressive, radioactive or special-purity flow medium

Abstract: A flow machine for pumping and/or measuring the flow of agressive, radioactive, or special-purity flow mediums. The flow machine is provided with a rotatable impeller magnetically supported within a machine casing such that the impeller is spaced at all points from the inside walls of the machine casing. The casing inside walls and the outer configuration of the impeller include a central cylindrical center section joined by conically outwardly flared end sections. Electromagnetics are arranged in the conical flared section outside of the inside wall for cooperation with magnetic material arranged in the corresponding conically flared sections of the impeller to support the impeller in position. The conically flared section facilitate both radial and axial support of the impeller, since both axial and radial components of electromagnetic force is experienced at the conically flared sections of the impeller. Means are provided to detect the gaps around the circumference of the impeller between the impeller and the casing inside walls, which means provide signals to an electronic device for controlling the respective current supply to the electromagnets so as to assure the maintenance of a substantially uniform circumferential gap around the impeller for all operating conditions. In one embodiment, the flow machine is constructed as an axial flow pump driven by an asynchronous electric motor having a rotor formed around the cylindrical section of the impeller and a stator arranged outside of the inside walls along the cylindrical section thereof. A further embodiment of the flow machine is constructed as a flow meter which includes means for detecting the rotational speed of the impeller, which rotational speed is a direct function of the volumetric flow and/or velocity of the flow medium through the impeller.

Adaptor and frame for a centrifugal pump

Abstract: Centrifugal Pump Means to provide selectively close coupled centrifugal pump means and separately coupled centrifugal pump means from a wide variety of interchangeable modular components including respectively pluralities of different, interchangeable pump casings, pump impellers, pump drive shafts, adaptors, pump drive means and shaft seals each of which may be readily and conveniently operatively connected to each of the other stated pump components to thereby enable the provision of a very wide variety of different centrifugal pump means taking either close or separately coupled form, each of which is particularly suitable for a group of different pumping applications, without requiring the manufacture and inventory of a wide variety of completed pumps.

Cascade diffuser having thin, straight vanes

Abstract: A cascade diffuser providing high pressure recovery in radial flow turbomachinery has first and second vaned diffuser stages arranged between an impeller and collector. The first and second stages are formed by thin, straight vanes which contribute substantially to the pressure recovery rate. The first stage vanes are preferably spaced apart from the impeller to provide a vaneless region for initially conditioning fluid flow from the impeller. The leading edges of the first stage vanes are preferably tapered to provide a semi-vaneless transition region between the vaneless region and first diffuser stage. The diffuser walls form a flow path between the impeller and collector between which the first and second stage vanes are disposed.

Centrifugal blasting wheel

Abstract: A centrifugal blasting wheel is provided which permits rapid and easy blade removal and replacement by providing: a control cage and impeller which can be removed from a central opening defined by the inner ends of the radially extending blades; a blade holding means which utilizes the spacers holding the wheel side plates apart to engage a holding shoulder on the blades to prevent further radial outward movement; and a removable centering plate mounted in the central opening to prevent radial inward movement.

Turbomachinery and method of manufacturing diffusers therefor

Abstract: A radial flow compressor is described which includes a diffuser having an annular entrance chamber surrounding the circumferential discharge of the impeller of the compressor. Diffuser channels extend from this annular chamber to an axial flow diffuser from which the compressed air is discharged into a collection chamber. The annular chamber is provided with contoured nodes from which the channel diffusers respectively extend at relatively low angles, tangentially in relation to the periphery of the impeller.

Motor-fan unit for moving wet working air

Abstract: In an electric motor fan unit for environments such as washing machines, vacuum cleaners, air samplers, a motor section frame enclosing an internal motor cooling air path includes an end bracket with an enlarged rim for mounting fan shell and interior partition structures defining a fan section housing for a smaller motor ventilating impeller and a larger working air centrifugal impeller commonly mounted on the motor shaft outboard of the motor section frame and drawing respective air streams into housing axial inlets for discharge at the housing circumference. Back-to-back and axially spaced impeller dispositions and corresponding housing structures and also resultant direction of ventilating air from the motor to the air discharge region ensure both adequate motor and adjacent bearing ventilation and bearing protection from working air borne moisture, contaminants, and high temperature and humidity, by simple, low cost, durable structure.

Swimming pool cleaning device

Abstract: A swimming pool cleaning device having a floating head which is placed upon a pool surface and adapted to be supplied with water from a floating flexible hose, the floating head having cleaner hose attachments and an impeller all receiving a portion of the water supplied to the head, the impeller and a rudder being carried by a hollow swivel through which water is supplied to the impeller and being so constructed and arranged as to propel and guide the head around the pool in a random manner.

Centrifugal mixing apparatus and method

Abstract: An improved apparatus and method for mixing a second material into a first fluid material includes a container for the first fluid material, a motor driven centrifugal impeller, and a conduit having an outlet coaxial with and adjacent to the centrifugal impeller for feeding the second material into the center of the impeller. The impeller is located in the container of fluid material, and the improved apparatus includes means for directing a portion of the fluid from the container inward for mixing with the second material as it enters the center of the impeller and means for directing at least a portion of the mixture flowing from the impeller outward for dispersion in the fluid in the container. The apparatus preferably also includes means for recirculating a portion of the mixture from the impeller directly back for mixing with and imparting momentum to the first and second materials as they enter into the center of the impeller. An alternate embodiment of the apparatus includes a venturi section coaxially surrounding the conduit for feeding the second material into the center of the impeller and means for recirculating at least a portion of the mixture flowing from the impeller back to the inlet of the venturi section to augment the pressure at the impeller inlet.

Flow switching valve

Abstract: A fluid flow valve is disclosed for sequentially switching an incoming fluid stream through each of a plurality of outlet ports. An impeller is disposed for angular rotation within the valve and turns in response to the flow of fluid. The impeller is connected to a rotor by means of a planetary gear train. The rotor operates a cam which opens one segment of a multi-segmented plate associated with the outlet ports, thereby allowing fluid flow through the selected outlet ports.

Aeration apparatus for liquids

Abstract: An aeration apparatus for liquids comprises a driven aeration impeller with axial intake and radial discharge and having a substantially vertically disposed axis. The aeration impeller comprises two suction sides arranged above one another and working in opposed directions. Guide channel means connect each suction side with the discharge sides of the aeration impeller, and there is provided conduit means for at least one of the guide channel means for the infeed of an aeration medium. The operation of the above aeration apparatus comprises the steps of arranging the aeration impeller in an aeration tank having a subsequently arranged settling tank of a sewage purification plant, and delivering activated sludge from the settling tank to one suction side of the aeration impeller.

Pump for aquarium filter tanks

Abstract: An aquarium filter pump which draws water from below filter material in a filter tank and returns it to an aquarium has a vertical pump casing conforming to an elongated impeller having a smaller lower end and a larger upper end above the top of the filter tank, the smaller lower end priming the upper end for more efficient pumping action. The pump motor is mounted on top of the casing and has a shaft extending down into it on which the impeller is mounted. The upper end of the impeller is formed as an inverted conical boss containing blades which throw water away from the shaft entrance. The shaft entrance into the casing has an adjustable seal admitting air for selective aeration. The casing has relatively rotatable inner and outer casings closed at the top and open at the bottom with a clearance therebetween. The outlet tube on the outer casing slides over an outlet opening in the inner casing so that relative rotation of the casings directs selected proportions of pumped water through the outlet tube and between the casings for recirculation back into the filter tank.

A Comparison of the Predicted and Measured Performance of High Pressure Ratio Centrifugal Compressor Diffusers

Abstract: A novel analysis of the hub and shroud wall boundary layer growth through the diffusing system of a centrifugal compressor is proposed to model the physical processes. It is shown that the diffuser throat blockage and total pressure loss characteristics can be accurately predicted for a 6:1 PR stage. The static pressure effectiveness and stalling limit are successfully predicted qualitatively, but are underestimated and overestimated by 14 and 12 percent respectively. It is argued that diffuser performance is largely controlled by the combined effect of the boundary layer conditions on the hub and shroud walls at impeller exit and the diffusion required to the diffuser throat. For this reason, it is contended that, for best performance at high pressure ratio (≃ 12:1), impeller exit Mach number must be minimized by employing zero to negative prewhirl at impeller entry which in turn maximizes impeller entry shroud relative Mach number. Performance maps are presented for a single-stage centrifugal compressor based on this premise with specific speed = 90. At 15, 12 and 101 PR, 72, 75 and 76.8 percent efficiency, respectively, were attached at 2.6 lb/sec.Copyright © 1972 by ASME

Impelling wheel for particulate material

Abstract: An impeller wheel for particulate material having a plurality of tubes radially positioned for impelling the material under the action of centrifugal force. The impeller wheel has a distributing rotor for the material at the axis of rotation of the wheel, the rotor having blades which are shaped to induce the material to be fed to the inner ends of the tubes in the stream of restricted width while the tubes are each rotatable about their longitudinal axis to bring different parts of the tubes into line with the stream so as to be subject to wear selectively.

Inboard propulsion system for a boat

Abstract: An inboard propulsion system for a boat utilizing a water jet propulsion characterized by a pair of spaced nozzles each provided with individually controlled deflecting hoods to enable providing both a reverse thrust for backing the boat and to selectively reverse the water jet of a single nozzle to provide a turning force for steering the boat. Preferably, each of the nozzles is provided with a servo system which varies the effective opening of the nozzle in response to changes in the pressure differential between the intake pressure to the main impeller unit and the discharge pressure of the impeller unit to attempt to maintain a constant quantity flow from the nozzles independent or regardless of any variations in the intake pressure of the impeller unit.

Multistage pump and manufacturing method

Abstract: A multistage centrifugal pump having a divided forged and formed housing with a generally round and elongated pumping chamber defined within the housing, an integral multistage impeller assembly having a plurality of impellers dynamically balanced for rotation after final fabrication then rotatably mounted within the chamber, a plurality of interstage pump volute members each comprised of segments fitted between the impellers and around the impeller assembly and mounted in the housing within the chamber, and a method for manufacturing the pump.

Pump-and-motor unit, particularly for supplying fuel

Abstract: A pump-and-motor unit comprises, within a sealed housing, a lateral channel pump and an electromotor, the rotor of which drives the impeller of the pump. The unit housing has at each end an axially aligned liquid inlet and outlet nipple, respectively. At the pressure side of the pump the liquid is guided from the lateral channel of the pump radially inwardly through a pressure channel provided in a lateral channel plate serving as a pump housing.

Submersible fuel pump

Abstract: A rotary electric fuel pump using a permanent magnet motor is constructed of parts having a simple geometric pattern for mass production by sheet metal stamping and plastic molding. The construction provides for housing a cylindrical magnet stator for a motor field and a high-speed armature. The fuel medium being pumped flows over the magnet effecting cooling, with some diverting of flow through the armature for cooling. A further feature resides in the construction of an impeller having flow passage to the stator slots phased in such a manner that peak flow pressure at the slots is evened out around the impeller. Thus, the impeller vane spacing is related to that of the stator slots that only one flow pressure peak occurs at a time, and such peaks occur sequentually at widely spaced points around the rotary axis. This minimizes electric current peaks and brush sparking as well as bearing wear. The construction is fully sealed for submerged use in fuel tanks.

In-line pump

Abstract: An in-line pump having a parallel inlet and outlet and an impeller shaft bearing housing carried by the pump housing above the impeller. A motor adapter is also mounted on the pump housing and carries a motor above the bearing housing. The motor shaft extends downwardly in alignment with the impeller shaft and the two shafts are interconnected by a flexible coupling.

Pump with offset inflow and discharge chambers

Abstract: This invention relates to an improvement in a pump for high operating pressures, particularly a main coolant pump for pressurized water or boiling water reactors comprising a pressure housing, a vertical pump shaft having an impeller thereon, a distributor surrounding the impeller, and suction and discharge connections, the pump shaft having an axis normal to the axis of the suction and the discharge connections. The improvement comprises a separator plate having an opening therein and dividing the pressure housing into a lower section constituting an inflow chamber and an upper section constituting a discharge chamber, the upper section containing the impeller and the distributor, and the inflow chamber and the discharge chamber constituting rotational chambers which are mechanically machined.

Channel diffuser with splitter vanes

Abstract: A centrifugal impeller discharges supersonic flow into a channel diffuser having a plurality of passages of rectangular cross section with leading edges closely adjacent the periphery of the impeller. A series of splitter vanes in the passage inlets have leading edges closely adjacent the periphery of the impeller and divide the inlet region into two separate passages through which the supersonic flow is shocked down to a subsonic level with an efficient pressure increase.