US3640452A - Centrifugal separator - Google Patents

Centrifugal separator Download PDF

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Publication number
US3640452A
US3640452A US865798A US3640452DA US3640452A US 3640452 A US3640452 A US 3640452A US 865798 A US865798 A US 865798A US 3640452D A US3640452D A US 3640452DA US 3640452 A US3640452 A US 3640452A
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US
United States
Prior art keywords
housing
rotor
liquid component
outlet
level
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US865798A
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English (en)
Inventor
Henric Wilhelm Thylefors
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alfa Laval AB
Original Assignee
Alfa Laval AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alfa Laval AB filed Critical Alfa Laval AB
Application granted granted Critical
Publication of US3640452A publication Critical patent/US3640452A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/02—Casings; Lids
    • B04B7/04—Casings facilitating discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/04—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls
    • B04B1/08—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls of conical shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/10—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl

Definitions

  • the present invention relates to centrifugal separators of the type in which the centrifugal rotor is surrounded by a stationary housing into which a liquid component of the mixture to be separated is thrown from the rotor.
  • centrifugal separators of the above-noted type, it is known to provide the driving shaft of the centrifugal rotor with a pump rotor which pumps away the liquid component collected in the housing.
  • a pump has certain drawbacks, among which are that it requires a high-pumping effect and also is eroded to a great extent if the pumped liquid com ponent is a sludge.
  • air is mixed into the pumped liquid, which is normally undesirable for various reasons.
  • An object of the present invention is to provide a centrifugal separator of the type described which avoids the above-noted drawbacks.
  • the interior of the stationary housing is provided with a level control means for the liquid component, such control means being arranged to regulate a supply of superatmospheric pressure gas to the interior of the housing, and the latter is provided with a bottom outlet for discharging the liquid component and which is subjected to a counterpressure.
  • control means being arranged to regulate a supply of superatmospheric pressure gas to the interior of the housing, and the latter is provided with a bottom outlet for discharging the liquid component and which is subjected to a counterpressure.
  • superatmospheric pressure gas may be supplied to the interior of the housing to replace such gas as has leaked from the housing or has accompanied separated components discharged from the separator.
  • the separator rotor itself serves as the pump for the component discharging through the outlet at the bottom of the housing, in that the latter component as it leaves the rotor will displace gas within the housing, and the resulting compression of the gas therein forces a corresponding quantity by volume of the component through the outlet at the bottom of the housing.
  • the discharge takes place without an eroding effect, even if the component consists of sludge.
  • gas has an opportunity of separating from the component in the liquid seal formed by the component in the lower part of the housmg.
  • the invention may be used to particular advantage in connection with a nozzle centrifuge in which, in order to obtain sludge which is satisfactorily concentrated, sludge thrown from the rotor nozzles is returned to the inlet of the rotor through a pipeline leading from the bottom of the housing, the returned sludge usually being supplied directly to the vicinity of the nozzles in the rotor. ln a nozzle centrifuge having such a sludge return, the problems in regard to erosion and/or air admixture are often difficult to overcome.
  • a paring disc provides an outlet for discharging a separated component from the rotor and forms a liquid seal between the atmosphere surrounding the rotor and an atmosphere present within the rotor.
  • a communication is provided between the atmosphere within the rotor and the atmosphere surrounding the housing.
  • the centrifuge as illustrated comprises a rotor body i having a cover 2 secured to the rotor body by a threaded locking ring 3.
  • the rotor is mounted on and driven by a vertical shaft 4 and is surrounded by a stationary housing 5.
  • the bottom of the housing is sealed against the driving shaft 4 by a carbon ring 6 surrounding the shaft and urged against the rotor bottom by a spring 6a, the ring and spring being located in a guide 6b in the bottom of the housing 5.
  • the rotor 1 contains a distributor 7 and a conical disc set 8, the latter being located as usual in the separating chamber of the rotor.
  • Sludge outlet nozzles 9 are provided in the outer periphery of the rotor body.
  • a supply pipe 10 for the mixture to be separated opens into the distributor 7. Liquid separated from the mixture and discharging from the inner edge of the disc set 8 passes through openings 11 to a paring chamber 12 in the upper part of the rotor, where this liquid forms a liquid level 14 on both sides of a paring disc 13, the separated liquid being pumped by the paring disc through a discharge pipeline l5.
  • Sludge discharged from the rotor nozzles 9 collects in the lower part of housing 5 where it forms a liquid level 16, the sludge being discharged through an outlet 17 extending from the bottom of the housing. Part of the sludge discharging through the outlet 17 is directed into a pipeline 19 by means of a controllable valve 18.
  • the pipelines 10, 15 and 19 as well as the paring disc 13 are stationary, and these pipelines have respective depending portions arranged concentrically within each other at the top of the rotor.
  • the outside of pipeline 15 is hermetically sealed against the housing 5, as shown at 15a. Also, suitable seals are provided where the pipeline l9 enters the pipeline 10 and where the latter enters the pipeline 15.
  • the pipeline 19 opens into a space 20 below a conical disc 21 in the rotor, and from space 20 the returned sludge enters a number of radially arranged bent pipes 22 which lead the sludge outwardly to the vicinity of the nozzles 9.
  • a float 23 is provided in the interior of housing 5 and operates through a conventional float valve 23a to control admission of compressed air into the housing from a supply pipe 24.
  • the latter may thus be considered as a source of superatmospheric pressure gas.
  • the atmosphere in the rotor space 20 communicates with the atmosphere in the paring chamber 12 by way of the central air space 26 in the rotor.
  • the rotor space 20 also communicates with the atmosphere surrounding the housing 5 by way of a central channel 25 in the driving shaft 4, this channel opening laterally through the shaft as shown at 25a.
  • valve 18 is adjusted so that a desired part of the separated sludge is returned to the interior of the rotor in the vicinity of its nozzles 9. This adjustment creates in the outlet 17 a certain counterpressure which, in a condition of balanced operation, is maintained substantially constant. If the level 16 sinks in housing 5, the float valve 23-23a throttles the admission of compressed air from the pipe 24. This causes the pressure of the atmosphere in the interior of housing 5 to decrease, since the rate of compressed air admission from the pipe 24 will now be less than the rate at which air leaks from the interior of the housing (due to normal leakage).
  • a centrifugal separator for a mixture including a liquid component
  • combination comprising also a pipeline leading from the bottom of said housing for returning sludge from said nozzle to said inlet of the rotor.

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  • Centrifugal Separators (AREA)
US865798A 1968-10-14 1969-10-13 Centrifugal separator Expired - Lifetime US3640452A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE13806/68A SE324337B (it) 1968-10-14 1968-10-14

Publications (1)

Publication Number Publication Date
US3640452A true US3640452A (en) 1972-02-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
US865798A Expired - Lifetime US3640452A (en) 1968-10-14 1969-10-13 Centrifugal separator

Country Status (3)

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US (1) US3640452A (it)
DE (1) DE1949876C3 (it)
SE (1) SE324337B (it)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4325825A (en) * 1979-04-26 1982-04-20 Hoechst Aktiengesellschaft Separator
US4342419A (en) * 1980-10-31 1982-08-03 Beckman Instruments, Inc. Safety cover for centrifuge bucket
US4377253A (en) * 1980-02-12 1983-03-22 Syglo International S.A. Coupling assembly particularly for centrifuges
US4614598A (en) * 1980-05-23 1986-09-30 Westfalia Separator Ag Centrifugal separator drum for the clarification and separation of liquids
US4629564A (en) * 1984-03-01 1986-12-16 Alfa-Laval Separation Ab Centrifugal separator with annular sealing means arranged around the rotor outlet for separated liquid
US4759744A (en) * 1986-03-12 1988-07-26 Alfa-Laval Separation Ab Centrifugal separator with recirculation of separated sludge
US5000730A (en) * 1986-06-16 1991-03-19 Ab Kompositprodukter S.K.-F.M. Screw joint
US5199938A (en) * 1990-11-19 1993-04-06 Westfalia Separator Ag Centrifuge drum for concentrating suspended solids
US5487720A (en) * 1990-04-03 1996-01-30 Occam Marine Technologies Ltd. Particle concentrator
US5914034A (en) * 1997-06-09 1999-06-22 Inter-Citic Envirotec, Inc. Centrifugal flotation cell with rotating feed
US5928125A (en) * 1997-06-09 1999-07-27 Inter-Citic Envirotec, Inc. Centrifugal flotation cell with rotating drum
US6325751B1 (en) * 1998-02-27 2001-12-04 Alfa Laval Ab Centrifugal separator casing with reduced separated product discharge velocity
US20130029828A1 (en) * 2010-01-29 2013-01-31 Alfa Laval Corporate Ab System comprising centrifugal separator and method for controlling such a system
US20130065744A1 (en) * 2010-03-19 2013-03-14 Per Karlsson Device and method for monitoring and adjusting the radial position of an interface layer in a nozzle centrifuge
RU2573473C2 (ru) * 2011-09-08 2016-01-20 Альфа Лаваль Корпорейт Аб Центробежный сепаратор
EP4008437A1 (en) * 2020-12-07 2022-06-08 Alfa Laval Corporate AB A method of operating a centrifugal separator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE449951B (sv) * 1983-03-16 1987-06-01 Alfa Laval Ab Centrifugalseparator med central slamutmatning
SE436701B (sv) * 1983-05-27 1985-01-21 Alfa Laval Separation Ab Anordning innefattande virvelfluidistor for uppdelning av en blandning av en vetskefas och en relativt tung, vanligen fast fas
SE460707B (sv) * 1988-03-11 1989-11-13 Alfa Laval Separation Ab Centrifugalseparator med inloppsorgan innefattande pumpanordning foer ytterligare vaetska

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US958770A (en) * 1909-03-09 1910-05-24 William King Richardson Centrifugal water-purifier.
US1050622A (en) * 1911-07-31 1913-01-14 Harald De Raasloff Art of centrifugal separation.
US1723329A (en) * 1925-01-27 1929-08-06 Laval Separator Co De Apparatus and process for preventing contamination of centrifugallypurified liquids
US2526292A (en) * 1948-05-03 1950-10-17 Separator Ab Continuous production of butter from sour cream

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB995961A (en) * 1963-03-06 1965-06-23 Stamicarbon Process and installation for separating particles of different specific gravity

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US958770A (en) * 1909-03-09 1910-05-24 William King Richardson Centrifugal water-purifier.
US1050622A (en) * 1911-07-31 1913-01-14 Harald De Raasloff Art of centrifugal separation.
US1723329A (en) * 1925-01-27 1929-08-06 Laval Separator Co De Apparatus and process for preventing contamination of centrifugallypurified liquids
US2526292A (en) * 1948-05-03 1950-10-17 Separator Ab Continuous production of butter from sour cream

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4325825A (en) * 1979-04-26 1982-04-20 Hoechst Aktiengesellschaft Separator
US4377253A (en) * 1980-02-12 1983-03-22 Syglo International S.A. Coupling assembly particularly for centrifuges
US4614598A (en) * 1980-05-23 1986-09-30 Westfalia Separator Ag Centrifugal separator drum for the clarification and separation of liquids
US4342419A (en) * 1980-10-31 1982-08-03 Beckman Instruments, Inc. Safety cover for centrifuge bucket
US4629564A (en) * 1984-03-01 1986-12-16 Alfa-Laval Separation Ab Centrifugal separator with annular sealing means arranged around the rotor outlet for separated liquid
US4759744A (en) * 1986-03-12 1988-07-26 Alfa-Laval Separation Ab Centrifugal separator with recirculation of separated sludge
US5000730A (en) * 1986-06-16 1991-03-19 Ab Kompositprodukter S.K.-F.M. Screw joint
US5487720A (en) * 1990-04-03 1996-01-30 Occam Marine Technologies Ltd. Particle concentrator
US5199938A (en) * 1990-11-19 1993-04-06 Westfalia Separator Ag Centrifuge drum for concentrating suspended solids
US5928125A (en) * 1997-06-09 1999-07-27 Inter-Citic Envirotec, Inc. Centrifugal flotation cell with rotating drum
US5914034A (en) * 1997-06-09 1999-06-22 Inter-Citic Envirotec, Inc. Centrifugal flotation cell with rotating feed
US6325751B1 (en) * 1998-02-27 2001-12-04 Alfa Laval Ab Centrifugal separator casing with reduced separated product discharge velocity
US20130029828A1 (en) * 2010-01-29 2013-01-31 Alfa Laval Corporate Ab System comprising centrifugal separator and method for controlling such a system
US9186687B2 (en) * 2010-01-29 2015-11-17 Alfa Laval Corporate Ab Centrifugal separator with pressure or recirculation control or monitoring devices
US20130065744A1 (en) * 2010-03-19 2013-03-14 Per Karlsson Device and method for monitoring and adjusting the radial position of an interface layer in a nozzle centrifuge
US8702576B2 (en) * 2010-03-19 2014-04-22 Alfa Laval Corporate Ab Device and method for monitoring and adjusting the radial position of an interface layer in a nozzle centrifuge
RU2573473C2 (ru) * 2011-09-08 2016-01-20 Альфа Лаваль Корпорейт Аб Центробежный сепаратор
US9931646B2 (en) 2011-09-08 2018-04-03 Alfa Laval Corporate Ab Centrifugal separator having a forcing device to create a radial leak flow
EP4008437A1 (en) * 2020-12-07 2022-06-08 Alfa Laval Corporate AB A method of operating a centrifugal separator
WO2022122326A1 (en) * 2020-12-07 2022-06-16 Alfa Laval Corporate Ab A centrifugal separator and a method of operating a centrifugal separator

Also Published As

Publication number Publication date
DE1949876C3 (de) 1985-08-22
DE1949876A1 (de) 1970-09-24
SE324337B (it) 1970-05-25
DE1949876B2 (it) 1980-02-28

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