Showing papers on "Impeller published in 1970"

Improvements in or relating to centrifugal pumps

Abstract: 1,062,946. Mechanical seals; washers. SPEEDWELL RESEARCH Ltd. Nov. 3, 1964 [Nov. 14, 1963; Feb. 19, 1964], Nos. 44947/63 and 6878/64. Headings F2B and F2H. [Also in Division F1] In a centrifugal pump having an impeller mounted on a shaft in a chamber formed by two releasably-connected casing components, seal faces on a gland part in one casing component and a gland part on the shaft engage with relative rotation and are flushed at their outer peripheral edges by the liquid being pumped to prevent the formation of crystals at the faces. A collar 38 of ceramic, stainless steel or titanium, is supported in a rubber sealing ring 37 mounted in a rebate 36 in a casing component 10. A face 41 on the collar sealingly engages a face 42 on a graphite ring 43 engaging a rubber sealing ring 44 and embracing a sleeve 29 pinned at 32 to the shaft 31 of an electric motor 26a. Any liquid leaking past the faces 41, 42 is flung by a disc 33 out of peripheral spaces between the casing component 10 and the electric motor. A casing component 11 is detachably secured to the component 10 with a seal 21 therebetween, by three equi-angularly spaced thumb screws 22. Removal of the component 11 and a screw 50 permits removal of the impeller and rings 43, 44 for cleaning. The screw 50 abuts a rubber sealing washer 51 provided with a metal locking insert. The screw 50 and sleeve 29 may be of stainless steel or titanium.

Axial flow pump

Abstract: An axial flow pump includes a housing supporting a tubular, electric motor driven pump body for rotation about an axis, and a plurality of impeller units detachably supported within the tubular pump body. The impeller units are constructed to provide a substantially unobstructed axial pumping passage through the pump body and are removable from the pump body without requiring disassembly of the pump body or the housing.

Turbulence parameters in a stirred tank

Abstract: tirred tanks are widely used in the chemical indusS try for effecting mixing, but their design has so far been empirical. A theoretical treatment of the flow within a stirred tank is rendered intractable by the inherent randomness and three-dimensionality of the flow and non-linearity of the governing equations of motion. Experimental studies of the large- and small-scale turbulence characteristics in stirred vessels may be expected to lead to formulation of realistic models of the flow. These models can then be used to predict such quantities of engineering interest as the mixing efficiency, pumping capacity, power requirements, etc. It was the objective of this work to measure the turbulence characteristics of the high speed stream issuing from a turbine type impeller in a fully baffled tank. Turbulence parameters were measured using a constant-temperature hot-wire anemometer with air as the fluid within the tank. The hot-wire technique was chosen because of the ease of operation and extremely good frequency response. Use of mr as working fluid Cooper‘” recently showed that the temporal mean velocity distribution in the impeller stream is the same with air and water as the fluid in the tank. We have assumed that the small-scale turbulence characteristics would also be similar at equal Reynolds numbers irrespective of the fluid in the tank. There exists sufficient confirmation in the literature for air and water flows in circular pipes and circular jets, and also grid-generated turbulent flows in wind and water tunnels. Chuang and Cermak“’ have compared their measurements of turbulent intensities, shear stress and energy spectra in the pipe flow of distilled water for a Reynolds number of 5 x lo4 with those of Sandborn‘J) and Laufer“) who studied the flow of air in a pipe at the same Reynolds number. The agreement between the air and water data is remarkable

Pressure lubricated, cooled and thrust balanced pump and motor unit

Abstract: Electric motor driven pump units, especially suited for pumping liquefied gases, including cryogenic fluids, which are lubricated, cooled and balanced with small amounts of fluid pumped by the unit (pumpage), such as 1 to 3 percent of the designed flow capacity of the pump. These small amounts of pumpage are divided into a major flow path through the most heated portions of the units discharging on the pressure side of the pump and a minor flow path through a thrust bearing for the unit and then through the lesser heated portions to discharge on the intake side of the pump. The major flow path, receiving about 75 percent of the lubricating pumpage, is downwardly through the motor shaft radial bearings and rotor compartment to an impeller and a pumping or collection chamber. The minor flow path, receiving about 25 percent of the lubricating pumpage, is through variable thrust bearing orifices tending to raise the motor shaft and carry the axial load of the unit on a thin film discharging through the hollow interior of the shaft to the pump inlet. The pumpage in the major flow path is maintained under pressure and will not boil even when appreciably heated. The minor flow path picks up very little heat and is primarily for balancing the axial thrust load on the shaft.

In-line centrifugal fan

Abstract: In an in-line centrifugal fan having an annular centrifugal impeller mounted for rotation within a tubular housing, a plurality of independent axial-type impeller blades mounted for rotation with the centrifugal impeller and juxtaposed with the path of air discharged radially from the centrifugal impeller so as to draw such air into the axial-type blades and direct the air in an axial direction toward the outlet of the fan.

Holley fuel pump

Abstract: A vehicular fuel supply system includes a fuel tank within which is situated a fuel pump and electric motor assembly. The fuel pump assembly has an impeller driven by a permanent magnet type of motor provided with a drum type commutator. The entire fuel pump and motor assembly is contained within a housing which provides inlet and outlet passage means disposed on opposite sides of the pump and motor as well as fluid passage means about the motor assembly for permitting the fuel to flow from the housing inlet to the housing outlet.

Damping means for differential gas turbine engine

Abstract: The disclosure illustrates a damping device for a gas turbine engine of the type that has a centrifugal compressor impeller and aft positioned turbine wheel connected by concentric shafts to a forward mounted differential which has an output shaft. The device is positioned on the turbine shaft closely adjacent the differential drive to damp torsional vibrations.

Axial thrust balancing mechanism for motor driven pump

Abstract: AN AXIAL THRUST BALANCING MECHANISM FOR MOTOR PUMP WHEREIN TWO THRUST BEARINGS OF THE MATERIAL WHICH PERMIT A CERTAIN DEGREE OF ABRASION ARE SYMMETRICALLY ARRANGED AND SECURED TO AN INTERIOR OF A PUMP CASING SO AS TO ENCOMPASS EACH END OF MOTOR ROTOR SHAFT THROUGH TWO SYMMETRICALLY ARRANGED THRUST WASHERS MOUNTED ON THE MOTOR ROTOR SHAFT BETWEEN THE MOTOR ROTOR AND THE THRUST BEARING WITH A CERTAIN CLEARANCE. AN AUXILIARY THRUST BEARING OF THE MATERIAL WHICH PERMITS A CERTAIN DEGREE OF ABRASION IS RELEASABLY FIXED TO ONE SIDE WALL OF THE END PLATE FORMING A VARIABLE ORIFICE PROVIDED BEFORE AND/OR BEHIND THE IMPELLER.

Centrifugal pump with hydrostatic bearing

Abstract: A VERTICAL SHAFT, CENTRIFUGAL PUMP HAS A STEADY BEARING IN THE FORM OF A RADIAL HYDROSTATIC BEARING THAT JOURNALS THE SHAFT, THE HYDROSTATIC BEARING BEING ENERGIZED BY LIQUID CIRCULATED TO IT FROM THE DISCHARGE ZONE OF THE PUMP IMPELLER, THE CIRCULATION OF THE BEARING-ENERGIZING LIQUID BEING ACCOMPLISHED BY AN AUXILIARY CENTRIFUGAL IMPELLER DRIVEN BY THE SHAFT, THE AUXILLIARY IMPELLER-PREFERABLY BEING MOUNTED ON THE MAIN PUMP IMPELLER.

Multistage centrifugal pump

Abstract: Several embodiments of pumps are shown which are advantageous in pumping liquids containing abrasives FIGS 1-4 show a centrifugal pump with floating stages Each stage has a rubber journal and a stainless steel bushing which provide a radial bearing as well as a seal between the impeller chamber and diffuser passages The other embodiments show other forms of the bearing and journal members applied to a stacked (nonfloating) impeller type of centrifugal pump In FIGS 7 and 8, one of the members is tapered to allow the motor to operate more easily in liquids containing abrasives

Centrifugal pump with mating case plate volute halves and constant section impeller

Abstract: A centrifugal pump having front and back case plates with onehalf of a volute wall formed on each of the front and back case plates, the volute wall halves corresponding diametrically and in length such that when the case plates are disposed in abutting confronting relationship in an assembled pump the volute wall halves cooperate to form a complete volute passage. A radial force balancing partition is provided between an impeller confined by the case plates and the volute wall. The force balancing partition is similarly comprised of identical mating halves formed on the front and back case plates. The case plates house or confine an impeller having a constant wall thickness or cross-section throughout to substantially eliminate thermal shock in the impeller. The impeller includes recesses or cut-out areas in the opposite faces thereof to yield substantially greater hydraulic performance while at the same time reducing wear caused by abrasion.

Mixing in viscous liquids

Abstract: Detailed data are reported for blend time and turnover time with a 17-in. impeller operating in an 18-in. diameter tank. Above 1,500 centipoises, viscosity had no effect on blend time at constant speed. Blend time was inversely proportional to speed. The inner flight of a helical impeller is of value when blending pseudoplastic fluids but has no effect on blend time with Newtonian fluids. The ratio of blend time to turnover time is given, as well as the effect of several different helical impeller geometry variables.

Gas separator for a submersible oil pump

Abstract: A gas separator interposed between a submersible pump and electric motor includes a plurality of flow diversion means including a coaxial impeller for impelling well fluid through a spiral gas separator chamber wherein entrained gas is centrifugally separated from the well fluid. The disentrained gas is subsequently returned to the well fluid basin while the well fluid passes from the gas separator chamber into the inlet of a submersible pump.

Pump impeller making

Abstract: The process of making an impeller for use in a pump by affixing a disc having blades formed about its outer periphery onto the reduced diameter portion of a hub. A plurality of longitudinal grooves is formed lengthwise into the reduced diameter hub portion and then pressed into a circular bore formed in the center of the impeller disc. The assembly is then placed in a press to swage the outer annular edge of the reduced diameter hub portion into a chafer provided around the circular bore of the disc to thereby solidly hold the disk against the shoulder on the hub.

High speed mixing impeller

Abstract: A mixing impeller having vanes mounted at the periphery of a supporting disc, each vane having a root section by which it is pivotally mounted to the disc and an arm extending from the root section. The arms are shaped to correspond substantially to the shape of the supporting disc periphery and the sum of the peripheral developments of all the arms is greater than the periphery of the supporting disc.

Tank cleaning machine

Abstract: Hydraulic tank-cleaning apparatus having a stationary housing, a second rotatable housing for rotation about the stationary housing axis and a third rotatable nozzle housing for rotation about an axis normal to the stationary housing axis. Apparatus is driven by means of an impeller and a compact reduction gear train comprising a first and second set of spur and pinion gear assemblies coaxially arranged along a first and second shaft respectively for driving both housings at a speed substantially reduced from that of the impeller.

High flow pump impeller for low net positive suction head and method of designing same

Abstract: A centrifugal or axial-flow impeller has its blade elements inclined at a predetermined sweep angle gamma from the perpendicular to the direction of the approaching fluid being pumped. The sweep angle gamma is quite large, being in the inlet region of the impeller typically 45* or more.

Centrifugal refrigerant gas compressor

Abstract: The compressor includes a member engaged by the impeller if the same moves from normal operating position. Instantaneously, upon such engagement, the member is moved out of engagement with the impeller and effects actuation of contacts in an electrical circuit to signal the movement of the impeller and/or shut down the compressor before damage to the machine takes place.

Continuous power blender

Abstract: PARTICULATE MATERIAL FROM A HOPPER IS FED THROUGH A FEED TUBE INTO THE EYE OF THE IMPELLER OF A CENTRIFUGAL PUMP AND LIQUID IS ALSO DIRECTED INTO THE EYE BY A TUBE WHICH IS CONCENTRIC WITH AND SURROUNDS THE FIRST TUBE, BOTH MATERIALS THEN TRAVELING THROUGH THE IMPELLER TOGETHER, THERE BEING A PERIPHERAL CASING PORTION SURROUNDING THE IMPELLER FROM WHICH THE MIXTURE IS DISCHARGED TANGENTIALLY, AND THERE OPTIONALLY BEING A CENTRAL SCREEN SURROUNDING THE IMPELLER TO INSURE PROPER MIXING.

Reactor vessel and up-down mixer

Abstract: A mixer comprising sets of multi-bladed 45 DEG axial impellers for providing substantially perfect mixing in a cylindrical reactor vessel having an L/D ratio greater than one. A first set of impellers located closest the impeller shaft pump downward while a second set of impellers located outwardly from the first set of impellers pump upward enhancing the flow along the vessel walls.

Double impeller wheel

Abstract: A double impeller wheel for axial flow fans comprising a set of inner impeller blades surrounded by an intermediate ring, a set of outer impeller blades secured to the ring, the width of the ring in an axial direction being less than that of the impeller blades.

Centrifugal refrigeration compressor

Abstract: In a centrifugal compressor a sealed annular space is established between the backside of the impeller and the housing wall. Pump means is provided to maintain a minimum pressure in the annular space at a level above the pressure in the bearing structure mounted in the housing wall. The arrangement prevents the passage of oil from the bearing structure to the area behind the impeller when the discharge pressure falls to an abnormally low level.

Low-noise impeller for centrifugal pump

Abstract: A practical scheme for reducing the amplitude of fluidborne noise produced by a centrifugal pump which comprises an improved impeller in which the vanes are arranged in a single row and are skewed with respect to the shrouds so that the tips of adjacent vanes overlap in the circumferential direction. The arrangement results in a substantially continuous interaction between the vanes and the cutwater.

Gas compressor impeller and shaft assembly

Abstract: A centrifugal gas compressor impeller is assembled to a rotatable shaft with two friction washers having conical surfaces mating with respective opposite conical surfaces of the impeller that are concentric to a central impeller aperture through which a threaded bolt is passed and threaded into a threaded aperture at the end of the rotatable shaft The angles of concentricity for the conical surfaces of the washer are slightly different than the angles of concentricity of the mating impeller surfaces so that a friction lock is obtained between the shaft and impeller and also the impeller and washer apertures are slightly larger than the bolt shaft diameter so that an impeller centering relative to the shaft is assured during assembly

Method of changing capacity of fluid reaction device

Abstract: The capacity of a centrifugal compressor having an overhung rotor with a plurality of separate stage impellers is changed by machining the free curved edge of each impeller blade by an equal amount for each impeller along the entire curved edge length from the radially extending axial flow edge to the axially extending radial flow edge. Additional separate shrouds are provided that differ in diameter from the shrouds supplied with the impellers before machining by an amount equal to the diametric change occurring during machining. Further, separate annular diffusers are provided, with each diffuser having integral blades with free terminal edges lying in a common plane perpendicular to the axis of rotation and engaging the adjacent shroud, so that these radially extending diffuser blade edges may be machined by an amount equal to the axial component of machining on the corresponding impeller blades.

Encapsulated rotatable electric motor and rotatable fluid pump assembly

Abstract: To provide a totally oil-immersed motor for drive communication with a pump in a unitary assembly, an oil tight motor housing is separated from the pump housing by a thin, end wall to provide for heat exchange between the oil and the pumped fluid; the end wall is preferably of nonmagnetic, high-electrical resistance material, to permit a magnetic coupling to be used from the motor shaft to the pump impeller, the high-electrical resistance minimizing eddy current losses (such as some stainless steels). To facilitate assembly, the motor housing is preferably cylindrical for insertion of the motor therein as one unit, the pump housing with the common end wall being fitted on the cylindrical motor housing by means of an interengaging matching circumferential tongue and groove connection with an ''''O'''' ring as a seal, the parts being held together for example by screws.

Multi-stage pump and components therefor

Abstract: A multi-stage pump including a casing having an inducer section and at least one impeller section. A shaft rotatably driven by a suitable prime mover extends into the casing and the inducer and the impeller or impellers as the case may be in the casing are mounted on and are rotatable with the shaft. Novel spaced tapered roller bearing assemblies support the shaft, each bearing assembly being separately lubricated by a lubricant, e.g. grease, which is pumped by the action of the roller bearings through connected chambers and passages about the respective roller bearing assemblies. The spaced roller bearing assemblies are stressed for rigidity in assembled position by a telescoping piston means which defines a fluid chamber into which any suitable fluid can be introduced to force the piston means to engage and exert stress on the outer races of the respective tapered roller bearing assemblies for maintaining the tapered rollers thereof in contact with the races at all times during operation. Alternatively, slingers can be mounted for rotation with the shaft adjacent each of the tapered roller bearing assemblies for assisting the pumping action of the tapered roller bearings and for dissipating bearing heat. Axial thrust along the shaft is balanced by a fluid line connecting a leakage cavity behind the back shroud of the last mounted impeller to the inlet or suction side of the impeller. A pressure regulating valve may be provided in the fluid line for varying the pressure of the fluid in the leakage cavity as a function of variations in the pressure of the fluid flowing into the inlet or suction side of the pump. The pump provides for a reduction in cavitation at low load conditions by withdrawing or passing back flowing fluid from the periphery of the inducer through a leakage passage in communication with the pump suction. Additionally, cavitation over the entire operating range of the pump is reduced by communicating the leakage joints of the impeller casing wearing rings with the pump suction. Also disclosed is novel casing structure for withdrawing gases from suction fluid, withdrawn back flow fluid and fluid leakage from the wearing rings.

Liquid booster device

Abstract: A liquid booster device integrally formed with a turbine pump for delivering a liquid at or near boiling point upwardly from a liquid reservoir to the pump inlet. The tubular casing of the liquid booster device is integrally formed with the case head of the pump and houses at least one booster impeller mounted on a shaft extension of the main pump''s shaft. A circular flange is formed at the main pump''s inlet for mounting the combined turbine pump - liquid booster device at the top of the liquid reservoir such that the booster impeller is submerged in the liquid.

Fan arrangement having automatic control capability

Abstract: A fan arrangement with a motor for rotating the impeller thereof. A signal generator for producing an electrical signal in accordance with the rotational speed of the impeller. The generator including a stationary claim-pole unit with a pickup member. The rotor including a multi-pole permanently magnetized ring positioned outwardly of the claw-pole unit has been inserted.