Showing papers on "Impeller published in 1979"

Further development of the two-point test for workability and extension of its range

Abstract: Synopsis Apparatus has been developed to measure the flow curve of concretes of medium to high workability. An impeller in the form of an interrupted helix is rotated uniaxially in the concrete by means of a hydraulic transmission and the torque is determined from measurement of the oil pressure. The flow curves conform closely to the Bingham model and, by suitable calibration, it is possible to express values of yield stress and plastic viscosity in fundamental units.

System for converting solar heat to electrical energy

Abstract: This invention consists of a system and apparatus for converting solar heat to electrical energy by accumulating normally non-heated air under a transparent roof which covers a vast area of sand, gravel, or rock covered ground. The accumulated air is sucked into a very high tower of large diameter which is centrally located on said roof, by the existing air pressure differential. A central pedestal located within the tower, at its base, supports an electrical generator which is powered by an impeller which is activated by the air rising in the tower. A pair of truncated cones joined at their truncated openings provide a reduced area within which the impeller is located in order to increase the air velocity at this point, and the air entering the impeller is previously caused to assure a rotary motion by angular air entrances in an enclosure around said pedestal.

In-line centrifugal pump

Abstract: A ladder pump for use with a hydraulic dredge to increase the main pump efficiency comprises a casing and a vaned impeller located in the casing and mounted for rotation about a normally horizontal axis transverse to the ladder. The casing has an inlet and an outlet defining respective axes lying in a common plane perpendicular to the impeller axis and defining a deflection angle therebetween, with approximately 60° being typical. The diameter of the impeller and the inner dimensions of the casing together define a substantial clearance over at least that portion of an impeller vane's travel between the inlet and the outlet, so that large solid objects entering the pump may pass under the impeller and out the pump outlet. The impeller may have substantially rigid vanes, or the vanes may be flexible. The ladder pump fits in-line with respect to the suction pipe, and has an axial extension little wider than the pipe itself. Thus it is readily positioned proximate the suction mouthpiece where it can work most effectively.

Method and apparatus for blending liquids and solids

Abstract: A high capacity blender has been devised which is adaptable for use in achieving the proper blend of liquid-to-liquid or liquid-to-solid constituents making up a gel composition for use in fracturing oil and gas well formations in which a high speed impeller is mounted for rotation concentrically within an outer casing and has a solids inlet which is isolated from the liquid inlet. A series of liquid inlet apertures are disposed in outer concentric surrounding relation to the impeller, and impeller vanes within the impellers are operative to impart a centrifugal force to solids introduced therein whereby to direct the solids and materials radially and outwardly under considerable force into the liquid stream which is directed axially along the inner wall of a mixing chamber. A preselected amount of the blended materials may be recirculated through the impeller inlet, and varying amounts of the solids in proportion to the liquid may be introduced through the impeller region while assuring intimate mixing with the liquid stream in a single stage for introduction under the desired pressure for pumping into the well.

Part-circle sprinkler with reversible stator

Abstract: A part-circle sprinkler having a sprinkler head incorporating a nozzle continually oscillates between two positions. The sprinkler head is connected to a transmission driven by an impeller The impeller is driven by a reversible stator which can direct a plurality of channelized streams of water against either side of the blades of the impeller and thereby cause the impeller, sprinkler head and nozzle to rotate in a clockwise or a counterclockwise direction. The reversing stator is controlled by a resilient switching arm operated by adjustable fingers on the exterior of the sprinkler head, which set its limits of rotation. As each limit of rotation is reached, one finger exerts a torque on the switching arm. The torque causes the arm to twist until it exerts sufficient force on the reversing stator to overcome the force of the water on the stator vanes and thus reverse the direction of the stator. The sprinkler head then rotates in the opposite direction, which brings the other finger toward the switching arm. The flow of water through the sprinkler is axial from inlet to nozzle.

A Laser-Doppler Investigation of the Flow inside a Backswept, Closed, Centrifugal Impeller

Abstract: A laser-Doppler technique is successfully applied to measure the flow field inside a closed, backswept impeller, through a rotating window. Results show that, in contrast to the flow in many radial...

Impeller shroud of a centrifugal compressor

Abstract: The shroud or stationary housing for the impeller of a centrifugal compressor includes inherent means for selectively controlling the displacement thereof during operation of the centrifugal compressor, and in a manner to substantially maintain uniform spacing or clearance between the shroud and the blade tips of the rotating impeller in order to achieve improved performance at both part and full power operating conditions. The shroud is preferably formed of a unitary member including an annular, concave disc portion substantially corresponding to the configuration of the tips of the blades of the impeller, with the annular concave disc portion being rigid and connected to a fixed flange support portion by a flexible, annular diaphragm which extends generally perpendicular to the shaft of the impeller. The annular diaphragm is sufficiently flexible such that during operation of the centrifugal compressor, the differential thermal and pressure forces generated along the length of the blades within the compressor cause deformation of the flexible diaphragm and a substantially linear movement of the rigid, concave disc portion relative to the flange support portion. The movement of the annular concave disc portion substantially corresponds to the change in configuration of the blades, thereby minimizing blade tip losses.

Regenerative rotodynamic machines

Abstract: In a regenerative rotodynamic compressor, a portion of a disc-like impeller adjacent the impeller periphery extends radially through an annular chamber in the compressor casing concentric with the impeller, thereby dividing said chamber into two annular side channels, one on each side of the impeller. The portion of the impeller lying in the annular chamber has scooped out annular cavities or recesses in its sides in which are disposed rings of aerodynamic blades, and fluid flow passing around the annular chamber from an inlet to an outlet is caused to circulate repeatedly, flowing radially outward through the blading in the impeller cavities and radially inward in the annular side channels alongside the impeller outside the impeller cavities. The aerodynamic blades are designed so that the angle between the entry and exit flows of each blade is greater than 90°.

Side sheet for an impeller mower-conditioner

Abstract: SIDE SHEET FOR AN IMPELLER MOWER-CONDITIONER Abstract of the Disclosure A tractor drawn and powered impeller mower-conditioner in-cludes a transverse cutter bar comprising a series of side-by-side rotating cutting disks. An impeller rotor with free-swinging flails is mounted above and slightly to the rear of the cutter bar with its axis of rotation parallel to the cutter bar. A hood over the rotor includes a confining forward conditioning plate conforming fairly closely to the rotor periphery to form a conditioning zone and a rearwardly extending deflecting and windrow forming portion. The rotor is disposed and rotated so that the flails intercept cut material delivered rearwardly by the cutter bar and carry it inside the hood up and over the rotor through the conditioning zone to be discharged rearwardly into a windrow. The hood includes a side sheet having a fore-and-aft extending wall closely adjacent and alongside an end disk of the cutter bar and shaped and disposed to function primarily as a combined crop divider and safety shield, parting the standing crop ahead of the end disk to facilitate cutting and extending below the level of the disk to form a protective guard.

Method and apparatus for pumping gaseous liquids and separating the gaseous components therefrom

Abstract: A method and apparatus for pumping gaseous liquids in a centrifugal pump having a rotary impeller with an opening through the impeller. Liquid flowing into the pump is divided into two fluid streams at the impeller, one stream being the radial flow to the high pressure discharge part and the other stream containing the greater part of the gaseous component and directed to flow through the impeller opening. The impeller has surfaces that extend into this opening to positively drive therethrough the gaseous component stream.

Pumping stage for multi-stage centrifugal pump

Abstract: An improved diffusion bowl and pumping vanes of a centrifugal pump stage are employed in axially stacked, multi-stage pumps for use in oil wells. The wall thickness of the annular casing portion of the diffusion bowl element is reduced to a minimum consistent with the axial loading on the pump stage and the impeller vanes are radially extended to terminate closely adjacent the minimum wall thickness portion of the casing, thereby significantly increasing the pumping pressure developed by the stage without reducing the efficiency of the stage.

Flow pattern, circulation velocity and pressure loss in loop reactor.

Abstract: A loop reactor is regarded as a new type of reactor for bulk polymerization of olefins. Several approaches to evaluate its performance are made herein. A simple model of discharge flow is proposed and related with the results obtained by measurement of average circulation velocity. The average circulation velocity is proportional to impeller speed and the sine of the impeller blade angle. It depends upon Reynolds number and dimensions of the impeller. Flow pattern was measured and the influence of baffles and impeller geometry is discussed qualitatively. In the case of unbaffled conditions, fluid flows in a helical motion. Intensity of this motion increases with impeller speed and pitched angle. In the case of baffled conditions, tangential velocity component is suppressed and normalized distribution of axial velocity is independent of impeller geometry. Pressure distribution was measured and pressure loss was obtained. Total pressure loss shows good agreement with the value calculated by superposition of frictional loss in straight parts and bend loss in bends obtained from established correlations.

Two dimensional model analysis of flow behaviour of highly viscous non-newton-ian fluid in agitated vessel with paddle impeller

Abstract: A flow of non-Newtonian power law fluid in an agitated vessel with paddle impeller is obtained from numerical analysis based on a two dimensional flow model. The average shear rate obtained from the numerical solution coincides well with the experimental result for large-size impeller of d/D>0.7, and it is confirmed that the apparent viscosity is very useful in correlating not only power input but also shear stress distribution at vessel wall. The non-Newtonian viscosity profile in an agitated vessel depends remarkably on impeller dimension and scarcely at all on vessel dimension. This shows the usefulness of the concept of apparent viscosity proposed by Metzner et al. On the other hand, the velocity and vorticity profiles near the vessel wall can hardly be correlated with the characteristic velocity alone, because the flow pattern depends on the integrated effect of non-Newtonian viscosity in the flow region. These profiles show good similarity by using the appropriate correction factor.

Epicyclic nozzle drive, an orbital nozzle unit and a hydraulic cleaning head incorporating the same

Abstract: There is provided a drive for an orbital nozzle (42) comprising a housing (2) having a fluid inlet and containing a fluid driveable impeller (18) from which the fluid, in use of the drive, flows through a passage within the housing (2), epicyclic rotary speed reducing mechanism (5) in the housing (2), an output shaft (7) driven by the epicyclic at speed reduced below the impeller speed, a means driveable by the output shaft mounting the nozzle for rotation, including means for delivering fluid from the pasage to the nozzle (42), as well as an orbital nozzle unit which incorporates such a drive and a hydraulic cleaning head which incorporates such a drive or orbital nozzle unit.

Topical environmental device

Abstract: An apparatus for treatment of a human body having an enclosure equipped with an inlet and outlet is described wherein the inlet is in fluid communication with a source of liquid under pressure. A portion of the enclosure is provided with an open treatment zone. Opposite the inlet is an obstacle such as an impeller to create turbulence in the treatment zone.

Separable blade impeller

Abstract: A symmetrical, balanced, glass coated, four bladed impeller for use in closed vessels having blades arranged so that the impeller may fit through a relatively small manhole even though the effective diameter of the impeller is substantially larger than the manhole.

Impeller lubrication system for transmission pocket bearing

Abstract: An impeller lubrication system provides lubrication oil flow to a transmission pocket bearing. Splash and spray lubrication oil is directed from the transmission casing to a collector region along a shaft adjacent the pocket bearing. As the shaft rotates, oil is forced axially along the shaft by an impeller fixed to the shaft. The impeller forces the oil from the collector region to the pocket bearing through a lubrication port in the shaft.

Heat transfer in agitated vessels with special types of impellers

Abstract: Studies on the rate of heat transfer in agitated vessels with special types of impellers were carried out. The impellers used were a double helical ribbon, a quadruple helical ribbon and a helical screw. The liquid media investigated were water, bitumen and aqueous glycerine solutions. Vessel-wall heat transfer coefficients were obtained for each impeller. For the helical screw, an off-centered system was studied and the impeller surface heat transfer coefficients were also obtained. Experimental data were correlated using dimensional analysis.

Heavy duty impeller

Abstract: A fabricated, heavy duty centrifugal pump impeller wherein the relatively heavy gauge shrouds are formed by plastic deformation such as by metal spinning, stretch forming or hydroforming. The hub is similarly formed and a plurality or regularly circumferentially spaced spiral vanes extend axially therebetween so that when the hub, blades and shroud are joined by welding or brazing, there is formed a heavy duty impeller having an axially extending inlet and a radially extending annular outlet. Following the fabrication, the impeller is finished and metallized.

Cooling a motor of a centrifugal pump for conveying liquids with deposited solids

Abstract: A centrifugal pump for conveying liquids with deposited solids has two grooves winding in opposite directions around the impeller axle from the inside to the outside, one groove being in the radial annular surface of the sealing cover of the pump housing and the other in the impeller hub. These surfaces rotate relative to each other and are separated from each other by a leakage gap. The radial inner wall of each groove forms a shearing edge with the adjacent annular surface and the grooves open outwardly towards the surge chamber of the pump housing and inwardly towards a central leakage-collecting chamber. The collecting chamber is connected to the cooling jacket of a pump motor and an outlet leads back to the suction inlet of the pump. Water penetrating into the leakage gap cools the motor and solids penetrating into the gap are separated by the shearing edges from the annular surfaces and forced back to the pressure side of the pump by the grooves.

Effects of Fluid Leakage on Performance of a Centrifugal Compressor

Abstract: Fluid loss caused by leaks through the impeller tip clearance was investigated for a centrifugal compressor. Operating conditions, Reynolds number, and clearance were varied independently during the experiment. It was found that the average compressor performance would be reduced by about 4 percent when the relative clearance was increased from 0.0125 to 0.125 and the resulting leakage loss was dependent on the Reynolds number, the tendency of which was just opposite in case of wall friction loss, as was well-known. Moreover, a determination of the leakage loss coefficient was made as a function of the relative clearance, relative leak level and the Reynolds number as the result of this experiment.

Single vane rotodynamic impeller

Abstract: A single vane impeller having particular application for pumping liquids having a high solids content is disclosed having an axial feed inlet configuration and a centrifugal outlet configuration giving an impeller capable of outlet modification by cutting to accommodate differing pumping requirements

Inlet inducer-impeller for piston pump

Abstract: A pump has a pump driven impeller mounted immediately adjacent the port plate which cooperates with a collector to increase the tangential velocity of fluid entering the inlet port to substantially equal that of the barrel cylinder ports.