US3861584A - Self-purging centrifuge - Google Patents

Self-purging centrifuge Download PDF

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Publication number
US3861584A
US3861584A US371854A US37185473A US3861584A US 3861584 A US3861584 A US 3861584A US 371854 A US371854 A US 371854A US 37185473 A US37185473 A US 37185473A US 3861584 A US3861584 A US 3861584A
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United States
Prior art keywords
drum
fluid
side wall
openings
rotor assembly
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Expired - Lifetime
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US371854A
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English (en)
Inventor
Denis J Dudrey
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Sanborn Co
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Donaldson Co Inc
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Publication date
Application filed by Donaldson Co Inc filed Critical Donaldson Co Inc
Priority to US371854A priority Critical patent/US3861584A/en
Priority to DE2427718A priority patent/DE2427718C2/de
Priority to GB2559074A priority patent/GB1441487A/en
Priority to IN1315/CAL/74A priority patent/IN142591B/en
Priority to FR7421250A priority patent/FR2234043B1/fr
Priority to JP6979474A priority patent/JPS533826B2/ja
Application granted granted Critical
Publication of US3861584A publication Critical patent/US3861584A/en
Assigned to SANBORN COMPANY, INC. reassignment SANBORN COMPANY, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DONALDSON COMPANY, THE
Anticipated expiration legal-status Critical
Assigned to FIRST NATIONAL BANK OF BOSTON, THE reassignment FIRST NATIONAL BANK OF BOSTON, THE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SANBORN INC.
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/04—Periodical feeding or discharging; Control arrangements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges

Definitions

  • a cylindrical drum is mounted for rotation about a vertical axis within a housing.
  • a driven rotor is coaxi- [21] Appl' 37l854 ally mounted within the drum.
  • a fluid containing solid particles is introduced into the rotating rotor which [52] US. Cl 233/7, 233/27, 233/47 R, thrOWS the fluid toward the drum, causing rotation of 233/23 R, 259/107 the drum.
  • the particles collect on [51] Int. Cl B04b 9/06 the drum side wall.
  • the invention pertains to self-purging centrifuges and in particular to a centrifuge wherein the purging involves the setting up of a washing or eroding action.
  • a known way of purging a centrifuge involves scraping or plowing the accumulated solid particles. This method is shown in US. Pat. No. 3,403,848 (Windsor et al.'). In Windsor there is substantially no clearance between the rotor blades and the side wall of the bowl. When the rotor is braked it merely scrapes the accumulated particles from the side of the bowl and they drop through an annular baffle which is raised toward an opening in the bottom of the bowl.
  • the invention is a self-purging centrifuge including a drum and a rotor assembly.
  • the drum hasa side wall and a top wall member and is mounted, for rotation about a generally vertical axis.
  • the rotor assembly is coaxially mounted within the drum for independent rotation.
  • the rotor assembly includes a plurality of vanes, the outer edges of which are spaced a substantial distance from the side wall of the drum..Contaminated fluid which is to be centrifuged is introduced into the rotor assembly.
  • the contaminated fluid contains solid particles which are to be separated from the fluid.
  • a driving means rotates the rotor assembly at a predetermined. rate.
  • the rotating rotor assembly throws the contaminated fluid outwardly toward the side wall of the drum.
  • the rotor assembly imparts a rotating movement to the contaminated fluid directly toward the side wall of the drum, which causes the drum in turn to rotate.
  • an annular wall-of fluid is built up along the side wall of the drum. Centrifugal forces cause the particles to accumulate along the side wall of the drum. The inner portion of the wall of fluid is clarified because the solid particles are forced outwardly.
  • the clarified fluid is discharged through openings in a top wall member of the drum. The openings are spaced from the side wall of the drum and the blades of the rotor assembly extend beyond the openings.
  • An annular baffle extends inwardly from the bottom of the side wall of the drum.
  • the inner edge of the baffle is spaced from the side wall of the drum a greater distance than the outermost area of the openings in the top wall member of the drum so that liquid escapes out the openings rather than over the edge ofthe baffle. Particles are collected in the area on the side wall of the drum between the top wall member of the drum and the baffle on the bottom of the side wall of the drum. Braking means abruptly slows or stops the rotation of the drum to initiate a purge cycle.
  • FIG. 1 is an elevational view of the centrifuge, portions thereof being broken away and shown in section;
  • FIG. 2 is a sectional view of FIG. 1 as taken generally from the irregular line 22 of FIG. 1;
  • FIG. 3 is a sectional view as seen from the line 33 of FIG. 1 showing the bottom area of-the drum from which the purged fluid is discharged;
  • FIG. 4 is a sectional view as seen from the line 4-4 of FIG. 1 showing the rotor assembly vanes and the top wall member of the drum.
  • the centrifuge has a drum including a cylindrical side wall 10, a top wall member 12 and a frustoconical bottom member 14.
  • the periphery of wall 14 is attached to the bottom edge of side wall 10 and the center extends into the drum.
  • the rotor assem- 'bly includes a shaft 16, a fin assembly 18 bolted to shaft 16, and a set of flat, plate-like vanes 20 bolted to the fin assembly 18.
  • vane set 20 includes four vanes spaced degrees apart;
  • the drum and the rotor assembly are mounted in a housing including a generally cylindrical body '22, a top cover 24, and a bottom p ortion'26.
  • the drum and the rotor'assembly are concentrically mounted and rotate independently about a vertical axis.
  • the drum rotates on bearings 28 and 30 mounted in cover 24 and bottom member 14, respectively, and the rotor assembly rotates in bearings 32 and 34 mounted in wall member 12 and bottom portion 26, respectivelyfA motor (not shown) drives the rotor assembly through a set of belts 36 and a pulley 38 mounted on shaft 16.
  • Contaminated fluid that is, fluid containing solid particles
  • the contaminated fluid which for example may be machine tool coolant carrying metal chips or the like, is thrown or directed outwardly by the rotating fln assembly 18 and vanes 20 toward side wall of the drum.
  • the drum is driven by the viscous or shear forces associated with the fluid that is directed outwardly and rotated by the fin assembly 18 and vanes 20.In steady state operation the rotational rate of the drum lags behind that of the rotor assembly by 50 to 300 rpm. Typically the rotor assembly is driven at about 3,000 rpm.
  • Centrifugal forces cause the particles in the fluid to be thrown radially outwardly to accumulate in the portion of the fluid wall along side wall 10 of the drum.
  • clarified fluid is discharged through a set of equally spaced openings or ports 42 formed in a circle concentric with shaft 16 in top cover 12 of the drum, and is collected in an annular chamber 44 within the housing which surrounds the drum.
  • the outer wall of chamber 44 is formed by body 22 of the housing and the inner and bottom walls are formed by wall members 46 and 48, respectively.
  • a ring 50 having louvered openings therein is placed over the inside of ports 42 to prevent escape of contaminated fluid through the openings 42 during the purge cycle.
  • a ring-like baffle or shield 52 is placed over the outside of the openings 42 to prevent splashing as the clarified fluid is being discharged. Baffle 52 is spaced above the openings 42 and is secured to top wall member 12 at its inner edge to provide an unobstructed discharge space facing outwardly toward a curved splash cone 54 which directs the outwardly thrown fluid downwardly into chamber 44.
  • An air brake 56 is used to slow and stop the drum when the purge cycle is initiated.
  • brake 56 is actuated, a shoe 58 is driven upward and held against a projection 60.
  • Projection 60 is in effect an extension of the drum.
  • An annular rim or baffle 62 having a generally triangular cross section is secured to the bottom of the drum side wall 10 with one side wall thereof attached to the drum side wall and an opposite apex thereof forming a circular edge or lip 64 over which the fluid and resuspended particles flow during the purge cycle.
  • the inner edge or lip 64 of baffle 62 extends inwardly beyond the centers of ports 42. Note also that the outer edges of vanes extend beyond the outermost edges of ports 42. Particles are accumulated on the side wall 10 between the upper cover 12 and the baffle 62.
  • Posts 68 are formed such that the sides of the posts are substantially aligned with the flow of the fluid as it is discharged from the bottom of the drum during the purge cycle. Thus posts 68 do not impede the outward flow which circulates around the inner surface of body 22. This prevents the fluid that is discharged during purging from reaching bearings 30 and 34.
  • An access opening 69 is formed in side wall 22 radially outwardly of the discharge openings of drum 10.
  • the opening 69 provides a convenient means to gain access to screws which mount the baffle 62.
  • the opening 69 also forms a convenient means to clear or dislodge solids which may accumulate in the area adjacent the base of the rotor assembly.
  • louvered ring 50 prevents the flow of fluid through ports 42 during the purge cycle. Assuming that the rotor assembly and the fluid is moving to the right the fluid would have to double back to the left before it could flow up and out ports 42. I have found that this does not occur.
  • clarified fluid collected in chamber 44 is removed from the centrifuge through an outlet pipe 70.
  • the purging of solids is accomplished partly by utilizing the instability of the boundary layer created at the inner surface of side wall 10 when the drum is slowed or stopped by the brake.
  • a rotating flow is unstable if the magnitude of VR decreases with R, where VR equals the product of tangential velocity (V) and radius (R).
  • the incoming flow of contaminated fluid is generally shut off or reduced during the purge cycle.
  • the purge cycle may be initiated either at periodic intervals or by a sensor. In any case purging takes place before the accumulated particles reach the vanes 20 so that a significant quantity of fluid remains in the drum for erosion and resuspension of the particles, and the vanes are not embedded in the accumulated particles thus restricting or preventing the relative motion of the drum and rotor assembly which is necessary for proper purging.
  • the first is the washing or erosion and resuspension of accumulated particles. This is accomplished by the washing action caused by the rotational speed of the rotor assembly within the drum as the drum is being braked. Once the particles are loosened they are resuspended in the rapidly moving fluid.
  • the second action is the drainage of the particle-laden fluid due to the secondary flow pattern created by the braking of the drum.
  • a slow moving boundary layer is created adjacent side wall 10.
  • the faster moving fluid of the inner portion of the wall of fluid tends to displace the boundary layer fluid.
  • the radial surface 72 provided by the baffle 62 at the bottom of the drum provides a means for the exchange of fluid to take place.
  • Slow moving boundary layer fluid flows down and inward along surface 72.
  • the faster moving fluid, displacing the boundary layer fluid is itself slowed by side wall 10.
  • the profile of the wall of fluid within the drum becomes thicker at the bottom because of the downward boundary layer flow, and becomes thinner opposite the rotating vanes which maintain high rotation of the fluid.
  • a circulatory flow pattern is set up, with slow moving fluid from the thick lower portion experiencing a low centrifugal force, flowing upward along the inner surface of the fluid wall to take the place of the faster, outwardly moving fluid, experiencing high centrifugal forces, which has displaced the boundary layer fluid.
  • the opening in the bottom of the drum formed by baffle 62 is sized to allow a'controlled rate of fluid flow out of the drum with this circulatory flow pattern as described. As some fluid flows out, the effect of the vanes decreases, allowing fluid to flow out faster until all of the fluid slides out the bottom opening.
  • louvers 50 are formed as part of an annular ring. However, each louver 50 may be formed from a separate piece of material and mounted to the inside of top cover 12.
  • Fluid discharge time is the time it takes for the drum to be emptied of fluid when the brake is actuated and the input flow-of contaminated fluid is shut off.
  • Fluid discharge time can vary from three or four seconds upward and is influenced most by the inner diameter of baffle 62 and the viscosity of the fluid. The boundary layer created when the drum is stopped causes a thickening of the fluid wall at the bottom of the drum. 1
  • baffle 62 If the inner diameter of baffle 62 is too small, fluid will not drain from the drum but will continue to recirculate within the drum under the influence of the vanes 20. lfthe thickening portion of the fluid extends inward of the edge 64 of baffle 62, fluid will begin to drain from the drum at a rate determined by the size of the drum opening and the fluid profile.
  • the fluid profile is determined most by viscosity and to a'lesser extent by the depth that vanes 20 extend into the wall of fluid.
  • the discharge period of the purge cycle previously accumulated particles are being eroded by the shear forces imposed by the rapidly rotating fluid. If the discharge period is very brief, for example three to five seconds, not all of the caked particles will be resuspended and therefore the particles will not be completely purged from the drum. Obviously if little or no liquid is discharged, that is if the discharge period is infinite, particles will not be purged even though suspended.
  • baffle 62 becomes critical above this range so that fluid may not discharge at all because of slight decreases in viscosity due to temperature rise. For a purge time of less than about 10 seconds, particlesmay not be completely resuspended.
  • the inner diameter of baffle 62 may need to be sized for the particular application. Two or three baffles with different inner diameters may be sufficient to cover a range.
  • vanes pene- 'trate into the wall of fluid has an additional effect on discharge time and erosion forces.
  • benefits gained from increasing the depth ofvanes 20 into the fluid beyond about onequarter inch do not appear commensurate with the greater forces and loads on the drive motor and belt, etc.
  • Adjustable vanes may be appropriate and at any rate the vanes must be replaced periodically because they are subject to erosion durin the purge cycle.
  • the quantity of particles affects the ability to purge in two ways. First, with a large accumulation of particles there are more particles to be erode'dand suspended. Secondly, as the quantity of particles increases, the quantity of fluid available for erosion and resuspension of the particles decreases.'ln tests of a model of the embodiment of the invention described above, the limit of what can be purged effectively appear to be about cubic inches of particles (approximately one-third of the fluid volume) for the contaminants'tested. This limit is variable and depends upon the type of contaminant. In the embodiment tested the fluid capacity of the drum is about 5 quarts.
  • the purge cycle is initiated whenever the accumulation of particles reaches the maximum amount that can be reliably purged. This results'in the least amount of fluid passing through the drag-out or settling tank, the least wear and tear on the apparatus, and the least down-time for the centrifuge, i.e., time when it is not centrifuging and clarifying fluid.
  • the purge cycle can be initiated on a timed-interval basisv This interval can be set based on an estimate of the particle generation rate of the system and then adjusted through experience. This kind of control can be accomplished by a reset timer (adjustable inv the range of minutes to several hours) activating a program timer which controls the sequence of events during a purge cycle of about to 30 seconds.
  • the sequence of events during the purge cycle can vary.
  • the basic pattern is for the brake to be activated and the feed pump to be shut off at the beginning of the purge cycle and for the brake to be released and the pump turned on again after a delay of about 15 seconds.
  • This method is satisfactory in most instances, In some cases, however, where the particles are difficult to purge, the sequence of events can be changed.
  • the feed pump can be allowed to run for a few seconds after the drum has been braked. This extends the time during which particles are being eroded or washed and provides additional fluid for resuspension ofthe eroded particles.
  • the fluid flow during the purge cycle may be reduced rather than shut off completely. In this way the purge cycle can be extended indefinitely.
  • a self-purging centrifuge comprising:
  • a drum having a side wall and a top wall member
  • a rotor assembly coaxially mounted in said drum for independent rotation with respect to said drum, said rotor assembly comprising a plurality of vanes having the outer edges thereof spaced a substantial distance from said side wall of said drum;
  • said top wall having openings therein for discharging clarified fluid, said openings each having an outer edge spaced from said side wall;
  • annular baffle extending inwardly from the bot- 2.
  • said rotor assembly comprises a plurality of radially extending flat vanes each having a vertical outer edge thereof terminating between said openings in said top wall and said side wall.
  • louver means mounted inside said top wall member and over said openings, said louver means having louver openings aimed in the direction of fluid rotation, said louver means thereby blocking passage of fluid and resuspended particles through the openings during the purge cycle while permitting flow through said louver openings during normal operation.
  • baffle is a rim-like member removably secured to said drum side wall.
  • a self-purging centrifuge comprising:
  • a drum having a cylindrical side wall, and top and bottom wall members, mounted for rotation in said housing about said axis;
  • a rotor assembly coaxially mounted in said drum for independent rotation with respect to said drum, said rotor assembly comprising a plurality of radially extending flat vanes each having a vertical outer edge thereof spaced a substantial distance from said side wall of said drum to define a particle collection area therebetween;
  • said top wall having openings therein, spaced from said side wall, for discharging clarified fluid, said drum side wall collecting the solid particles being centrifugally removed therefrom;
  • an annular rim extending inwardly from said drum side wall and adjacent said bottom wall, to further define with said top walls said particle collection area therebetween, said rim having an inner lip spaced from said side wall a greater distance than said openings in said top wall;
  • h. means for abruptly slowing the rotation of said drum to initiate a purge cycle by disrupting the to tating fluid and thereby resuspending the separated particles in the fluid;
  • drain means in said drum below said rim for draining the fluid and resuspended particles from said drum during the purge cycle.
  • louver means mounted inside said top wall member and over said openings, said louver means having louver openings aimed in the direction of fluid rotation, said louver means thereby blocking passage of fluid and resuspended particles through the openings during the purge cycle while permitting flow through said louver openings during normal operation.
  • a self-purging centrifuge for clarifying contaminated fluid comprising:
  • drum having top and side walls, the top wall containing ports for the discharge of clarified fluid, the drum containing a bottom opening for draining purged fluid;
  • a rotor assembly rotatably mounted in the drum for directing contaminated fluid toward the side wall of the drum, said drum side wall collecting a layer of solid particles being centrifuged from the fluid, the rotor assembly including vanes, the outer edges of which extend outward beyond the discharge ports and are located a substantial distance from the side wall so as not to become embedded in the layer of particles, the outer portions of the vanes and the side wall of the drum generally defining a g. means for collecting the clarified fluid;
  • louver means for deterring the discharge of fluid through the discharge ports when braking occurs.

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  • Centrifugal Separators (AREA)
US371854A 1973-06-20 1973-06-20 Self-purging centrifuge Expired - Lifetime US3861584A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US371854A US3861584A (en) 1973-06-20 1973-06-20 Self-purging centrifuge
DE2427718A DE2427718C2 (de) 1973-06-20 1974-06-08 Zentrifuge zum Trennen von Flüssigkeiten und Feststoffpartikeln
GB2559074A GB1441487A (en) 1973-06-20 1974-06-10 Self-purging centrifuges
IN1315/CAL/74A IN142591B (de) 1973-06-20 1974-06-15
FR7421250A FR2234043B1 (de) 1973-06-20 1974-06-19
JP6979474A JPS533826B2 (de) 1973-06-20 1974-06-20

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Application Number Priority Date Filing Date Title
US371854A US3861584A (en) 1973-06-20 1973-06-20 Self-purging centrifuge

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US3861584A true US3861584A (en) 1975-01-21

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US371854A Expired - Lifetime US3861584A (en) 1973-06-20 1973-06-20 Self-purging centrifuge

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US (1) US3861584A (de)
JP (1) JPS533826B2 (de)
DE (1) DE2427718C2 (de)
FR (1) FR2234043B1 (de)
GB (1) GB1441487A (de)
IN (1) IN142591B (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2496497A1 (fr) * 1980-12-23 1982-06-25 Donaldson Co Inc Centrifugeuse a purge automatique
US4356959A (en) * 1979-08-17 1982-11-02 Scania Dental Ab Method particularly intended for separating mercury compounds and mercury alloys in solid particle form from a fluid, and an apparatus for carrying out the method
US4406651A (en) * 1982-04-15 1983-09-27 Donaldson Company, Inc. Multi-phase self purging centrifuge
US4517752A (en) * 1983-06-27 1985-05-21 Machine Technology, Inc. Splash retarder
US4973299A (en) * 1989-08-18 1990-11-27 Foster-Miller, Inc. Separation
US5018971A (en) * 1984-12-17 1991-05-28 Trawoeger Werner Separator
US5160609A (en) * 1989-03-31 1992-11-03 Herberg Jan W V D Centrifugal separator with discharge of separated constituents by braking moment
WO1993020946A1 (en) * 1992-04-10 1993-10-28 Warman International Limited Apparatus for separating materials
AU666362B2 (en) * 1992-04-10 1996-02-08 Weir Warman Ltd Separating, thickening or dewatering a solid/liquid mixture
US5879279A (en) * 1996-09-05 1999-03-09 U.S. Centrifuge Centrifugal separator apparatus having a vibration sensor
US6126587A (en) * 1998-04-08 2000-10-03 U.S. Centrifuge Centrifugal separator apparatus including a plow blade assembly
US6224532B1 (en) 1998-06-03 2001-05-01 Jeffery N. Beattey Centrifuge blade design and control mechanism
US6478724B1 (en) 1998-06-03 2002-11-12 Jeffery N. Beattey Centrifuge with clutch mechanism for synchronous blade and bowl rotation
US20040112824A1 (en) * 2002-12-16 2004-06-17 Adelbert Gorham High efficiency self-cleaning centrifuge
US20080026926A1 (en) * 2006-07-31 2008-01-31 Advanced Products Laboratories, Inc. Methods and apparatus for centrifuging dry solids
US20080272067A1 (en) * 2007-05-01 2008-11-06 Cavaliere William A Methods and Apparatus for Classification of Suspended Materials
US20120267303A1 (en) * 2009-10-29 2012-10-25 Alfa Laval Corporate Ab Centrifugal separator
US12134047B1 (en) * 2021-09-27 2024-11-05 Christopher Camiré Centrifuges

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JPS5167575A (en) * 1974-12-07 1976-06-11 Univ Kingston Ryutaino omoibubuntokaruibubuno bunrisuru hoho oyobi uzumakibunrisochi
DE3152648A1 (de) * 1980-12-23 1983-02-10 Donaldson Co Inc Selbstreinigende zentrifuge
EP0056511A3 (de) * 1981-01-19 1984-07-11 The Chartwell House Group Limited Zentrifuge und Verfahren zum Reinigen einer Zentrifugentrommel
US4534755A (en) * 1982-02-22 1985-08-13 Hoccum Developments Limited Centrifuges
JP2587837B2 (ja) * 1987-11-09 1997-03-05 三菱化学株式会社 多層回転成形体
GB9517677D0 (en) * 1995-08-30 1995-11-01 T M Products Ltd Apparatus for treating liquids

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US2436498A (en) * 1944-05-05 1948-02-24 Laval Separator Co De Apparatus for use in the centrifugal separation of serum from cheese constituents
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US3424375A (en) * 1967-06-02 1969-01-28 Turbo Separator Ag Continuously operating screenless screw-type centrifuge
US3443748A (en) * 1965-10-24 1969-05-13 Robert W Hooper Dynamic mixer and centrifuge combination for solvent extraction

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US3403848A (en) * 1967-04-03 1968-10-01 Star Cutter Company Centrifugal separator apparatus
DE2063063C3 (de) * 1970-12-22 1975-10-16 Amberger Kaolinwerke Gmbh, 8452 Hirschau Verfahren zum Abtrennen der Feststoffe aus einer Suspension, sowie zur Förderung des inneren Transportes und des Austrage des eingedickten Schlammes in Vollmantelzentrifugen, sowie zur Durchführung des Verfahrens dienende Zentrifugen
DE2125522A1 (en) * 1971-05-22 1972-12-07 Mse Holdings Ltd Centrifugal separator - with by-pass chamber esp for machine tool coolant with swarf

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US2395286A (en) * 1941-07-19 1946-02-19 Joseph M Merle Processes for chemically purifying and refining metals
US2436498A (en) * 1944-05-05 1948-02-24 Laval Separator Co De Apparatus for use in the centrifugal separation of serum from cheese constituents
US2587206A (en) * 1950-02-27 1952-02-26 John R Pattinson Centrifugal separator
US3443748A (en) * 1965-10-24 1969-05-13 Robert W Hooper Dynamic mixer and centrifuge combination for solvent extraction
US3424375A (en) * 1967-06-02 1969-01-28 Turbo Separator Ag Continuously operating screenless screw-type centrifuge

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4356959A (en) * 1979-08-17 1982-11-02 Scania Dental Ab Method particularly intended for separating mercury compounds and mercury alloys in solid particle form from a fluid, and an apparatus for carrying out the method
WO1982002153A1 (en) * 1980-12-23 1982-07-08 Co Inc Donaldson Self-purging centrifuge
US4350282A (en) * 1980-12-23 1982-09-21 Donaldson Company, Inc. Self-purging centrifuge
FR2496497A1 (fr) * 1980-12-23 1982-06-25 Donaldson Co Inc Centrifugeuse a purge automatique
US4406651A (en) * 1982-04-15 1983-09-27 Donaldson Company, Inc. Multi-phase self purging centrifuge
US4517752A (en) * 1983-06-27 1985-05-21 Machine Technology, Inc. Splash retarder
US5018971A (en) * 1984-12-17 1991-05-28 Trawoeger Werner Separator
US5160609A (en) * 1989-03-31 1992-11-03 Herberg Jan W V D Centrifugal separator with discharge of separated constituents by braking moment
US4973299A (en) * 1989-08-18 1990-11-27 Foster-Miller, Inc. Separation
WO1993020946A1 (en) * 1992-04-10 1993-10-28 Warman International Limited Apparatus for separating materials
AU666362B2 (en) * 1992-04-10 1996-02-08 Weir Warman Ltd Separating, thickening or dewatering a solid/liquid mixture
US5586966A (en) * 1992-04-10 1996-12-24 Warman International Limited Apparatus and method for separating solid/fluid mixtures
US5879279A (en) * 1996-09-05 1999-03-09 U.S. Centrifuge Centrifugal separator apparatus having a vibration sensor
US6149573A (en) * 1996-09-05 2000-11-21 Balcon, Inc. Centrifugal separator having a clutch assembly
US6251056B1 (en) 1998-04-08 2001-06-26 U.S. Centrifuge Centrifuge separation apparatus having a fluid handling mechanism
US6126587A (en) * 1998-04-08 2000-10-03 U.S. Centrifuge Centrifugal separator apparatus including a plow blade assembly
US6248054B1 (en) 1998-04-08 2001-06-19 U.S. Centrifuge Centrifugal separation apparatus having a mechanism to limit rotation of the bowl during a cleaning mode
US6461286B1 (en) 1998-06-03 2002-10-08 Jeffery N. Beattey Method of determining a centrifuge performance characteristic or characteristics by load measurement
US20060264312A1 (en) * 1998-06-03 2006-11-23 Beattey Jeffery N Centrifuge with clutch mechanism for synchronous blade and bowl rotation
US6478724B1 (en) 1998-06-03 2002-11-12 Jeffery N. Beattey Centrifuge with clutch mechanism for synchronous blade and bowl rotation
US20030017931A1 (en) * 1998-06-03 2003-01-23 Beattey Jeffery N. Centrifuge blade design
US6224532B1 (en) 1998-06-03 2001-05-01 Jeffery N. Beattey Centrifuge blade design and control mechanism
US20050003945A1 (en) * 1998-06-03 2005-01-06 Beattey Jeffery N. Centrifuge with a variable frequency drive and a single motor
US6932757B2 (en) 1998-06-03 2005-08-23 Jeffery N. Beattey Centrifuge with a variable frequency drive and a single motor and clutch mechanism
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Also Published As

Publication number Publication date
IN142591B (de) 1977-07-30
GB1441487A (en) 1976-06-30
DE2427718A1 (de) 1975-01-23
DE2427718C2 (de) 1983-10-20
JPS533826B2 (de) 1978-02-10
FR2234043B1 (de) 1977-06-24
JPS5037065A (de) 1975-04-07
FR2234043A1 (de) 1975-01-17

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