US3642136A - Automatic selector for various evacuation circuits of a centrifuge - Google Patents

Automatic selector for various evacuation circuits of a centrifuge Download PDF

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Publication number
US3642136A
US3642136A US882077A US3642136DA US3642136A US 3642136 A US3642136 A US 3642136A US 882077 A US882077 A US 882077A US 3642136D A US3642136D A US 3642136DA US 3642136 A US3642136 A US 3642136A
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United States
Prior art keywords
centrifuge
sediment
outlet pipe
liquids
pressure
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Expired - Lifetime
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US882077A
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English (en)
Inventor
Joseph Rousselet
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Rousselet SARL
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Rousselet SARL
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
    • 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
    • B04B11/043—Load indication with or without control arrangements

Definitions

  • An automatic selector for various evacuation circuits from a centrifuge is constituted by an adjustable electric, pneumatic or other pressostat, positioned in the outlet pipe of the evacuation nozzle of the centrifuge.
  • the pressostat is adapted to control the opening and closing members of the circuits conducting the liquids and/or sediments to their storage containers, as a function of the pressure in the outlet pipe.
  • the opening and closing members may be automatic valves on branch pipes from the outlet pipe.
  • the sediment branch pipe may be equipped with a bypass valve calibrated and adjustable for automatic operation, the liquid branch pipe having an electrovalve.
  • the pressostat may control a scraper knife removing sediment automatically through the bottom or side of a centrifuge of vertical or horizontal axis respectively.
  • the liquid In the centrifugal separation of liquid and denser solid elements contained in a centrifuge bowl, the liquid is often removed by an aspiration nozzle called a sucette, positioned tangentially inside the bowl and at thecircular level of the rotating liquid.
  • the tangential speed of the bowl, and consequently of the liquid, being high, the nozzle connected to the discharge tube for theliquid is placed tangentially and enables recovery of the clarified liquid at a considerable-pressure to be sent into a receivingtank, elevated or not.
  • this sediment occurs in a pasty form and more or less stiff, due to the fact that it is impregnated with a certain moisture content, and as a result of high pressures of the order of several kilos per cm. of the liquid and of the sediment, it is possible to remove by penetration of the nozzle, the solid which then flows in the form ofafirm stiff pudding.
  • Such a centrifuge which receives a contaminated liquid, for the purpose of purifying and clarifying it, has a continuous and automatic operation until the bowl is filled with a certain amount of sediment.
  • the nozzle serving for the removal ofliquid or solid is manually displaced by mechanical means, such as a. wheel and screw or other means, it is possible, by a transparent reference mark provided on the outlet pipe and even by the amount of force exerted for the penetration of the nozzle, to observe the passage from the liquid to the solid. In closing the outlet valve. of the liquid and in opening that corresponding to the sediment, the solid can then be emptied into a suitable tank.
  • an automatic selector for various evacuation circuits from a centrifuge is constituted by an adjustable, electric, pneumatic or other pressostat which, positioned in the outlet pipe of the nozzle, controls the operation of opening and closing members of the circuits conducting the liquids and/r sediments to their storage containers,
  • thefie is provided an improved centrifuge equipped with such an automatic selector.
  • the opening and closing members are constituted by electrovalves mounted on branch pipes coming from the outlet pipe of the nozzle.
  • the liquids or solids are directed into appropriate containers.
  • the branch pipe for the sediment is equipped with a calibratedbypass valve and adjustable 'by automatic operation, and only the branch pipe for the clarified liquid is equipped with an electrovalve.
  • the pressostat actuates a scraper knife removing the sediment automatically, through the bottom or through the side of the centrifuge, according as the latter has a vertical or horizontal axis.
  • the automatically advancing nozzle removes the liquid first and, after it has come into contact with the sediment, the pressostat, tripped by the increase in pressure, interrupts the automatic advance of the removal nozzle for the liquid and then controls the operation of the automatic advance of the knife, hence the scraping up of the stiff sediment, while the nozzle returns behind.
  • FIG. 1 shows a view in vertical section showing diagrammatically one embodiment of a centrifuge according to the invention, with a vertical axis; l
  • FIG. 2 is a plan view of the embodiment of FIG. I from above, showing the relative positions of the various elements of the recovery circuits of the liquid and of the sediment;
  • FIG. 3 and 4 are views similar to those of FIGS. 1 and 2, but showing another embodiment of a centrifuge according to the invention.
  • FIG. 5 is a view in longitudinal section of another embodiment showing the application of the selector an i of the scraper knife to a centrifuge with a horizontal axis. 7
  • 1 denotes the base supporting the vertical ball bearing, 2, 3 the rotary shaft on which is fixed a bbwl 4 in which terminates a pipe 5 bringing in the liquid to be purified.
  • the sediment 7 On rotation of the bowl 4, the sediment 7 is first deposited against the wall of the latter, while the liquid 8 is supported on this sediment, as shown in FIG. 1.
  • the centrifuge comprises also a removal nozzle 9, or sucette, connected by piping 10 to branch pipes 12 and 13 carrying the liquid and the solid, respectively, to tanks 14 and 15.
  • a pressostat l6 controlling the operation electrovalves 17 and 18 positioned on each of the pipes 12 and 13, as shown in FIG. 2.
  • pressostat l6 actuates the closing of the electrovalve l8 and the opening of that 17 for the next removal of the liquid.
  • the electrovalve 18 positioned on the tubing 13 is replaced by a bypass valve opening automatically beyond a certain pressure.
  • FIGS. 3 and 4 show a centrifuge in which the evacuation of stiff,.pasty sediment is effected through openings 19 provided in the bottom. To this end, it comprises a vertical scraper knife 20 whose movement is controlled by the pressostat 16.
  • the outlet pipe extending the nozzle 9 has no branch and ends at the tank 14 for the purified liquid. This pipe bears the electrovalve l7 and the pressostat 16.
  • the nozzle 9 ensures the removal of clarified liquid 8 and as soon as it comes into contact with the sediment 7, the pressostat l6 actuates the closing of the electrovalve 17, the placing in motion of the scraper knife 20, and the immediate withdrawal of the nozzle 9.
  • a centrifuge having a selector for the selective evacuation of liquids and sediment, wherein said centrifuge includes an evacuation nozzle with an outlet pipe for said evacuated liquids and sediment; said selector comprising a pressure-sensitive switch positioned in said outlet pipe, valve means in said outlet pipe, said switch controlling opening and closing of said valve means so as to alternatively permit and restrict How of said evacuated liquids and sediment through said outlet pipe in response to said switch sensing the pressure in the outlet pipe, said centrifuge being rotatable about a generally vertical axis; and a scraper knife for automatically removing sediment accumulated on the side of said centrifuge, said scraper knife being actuatable in response to said pressure-sensitive switch.
  • a centrifuge having a selector for the selective evacuation of liquids and sediment, wherein said centrifuge includes an evacuation nozzle with an outlet pipe for said evacuated liquids and sediment; said selector comprising a pressure-sensitive switch positioned in said outlet pipe, valve means in said outlet pipe, said switch controlling opening and closing of said valve means so as to alternatively permit and restrict flow of said evacuated liquids and sediment through said outlet pipe in response to said switch sensing the pressure in said outlet pipe, said centrifuge being rotatable about a generally horizontal axis; and a scraper knife for automatically removing sediment accumulated on the bottom of said centrifuge, said scraper knife being actuatable in response to said pressure-sensitive switch.

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  • Centrifugal Separators (AREA)
US882077A 1968-12-04 1969-12-04 Automatic selector for various evacuation circuits of a centrifuge Expired - Lifetime US3642136A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR69050702 1968-12-04

Publications (1)

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US3642136A true US3642136A (en) 1972-02-15

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US882077A Expired - Lifetime US3642136A (en) 1968-12-04 1969-12-04 Automatic selector for various evacuation circuits of a centrifuge

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US (1) US3642136A (OSRAM)
DE (1) DE1957194C3 (OSRAM)
FR (1) FR1597877A (OSRAM)
GB (1) GB1211950A (OSRAM)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EA017263B1 (ru) * 2007-12-26 2012-11-30 Открытое акционерное общество "Научно-исследовательский технологический институт "НИТИ-ТЕСАР" Центробежный очиститель жидкости
WO2015117198A1 (en) * 2014-02-06 2015-08-13 Andrew Hall Removable cleaning arm component for a centrifuge

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK268283D0 (da) * 1983-06-10 1983-06-10 Metrofoss Ks Fremgangsmade og apparat til separation af bakterier
DK81389D0 (da) * 1989-02-22 1989-02-22 Foss Electric As N Fremgangsmaade og apparat til separering af bakterier

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333765A (en) * 1963-06-25 1967-08-01 Turbo Separator Ag Centrifuge for separating solids from liquids

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333765A (en) * 1963-06-25 1967-08-01 Turbo Separator Ag Centrifuge for separating solids from liquids

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EA017263B1 (ru) * 2007-12-26 2012-11-30 Открытое акционерное общество "Научно-исследовательский технологический институт "НИТИ-ТЕСАР" Центробежный очиститель жидкости
WO2015117198A1 (en) * 2014-02-06 2015-08-13 Andrew Hall Removable cleaning arm component for a centrifuge

Also Published As

Publication number Publication date
DE1957194C3 (de) 1974-08-29
DE1957194B2 (de) 1974-01-24
DE1957194A1 (de) 1970-06-18
GB1211950A (en) 1970-11-11
FR1597877A (OSRAM) 1970-06-29

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