US3424375A - Continuously operating screenless screw-type centrifuge - Google Patents

Continuously operating screenless screw-type centrifuge Download PDF

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Publication number
US3424375A
US3424375A US673688A US3424375DA US3424375A US 3424375 A US3424375 A US 3424375A US 673688 A US673688 A US 673688A US 3424375D A US3424375D A US 3424375DA US 3424375 A US3424375 A US 3424375A
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US
United States
Prior art keywords
drum
centrifuge
screw
discharge screw
solids
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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
US673688A
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English (en)
Inventor
Fritz Maurer
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TURBO SEPARATOR AG
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TURBO SEPARATOR AG
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Filing date
Publication date
Application filed by TURBO SEPARATOR AG filed Critical TURBO SEPARATOR AG
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Publication of US3424375A publication Critical patent/US3424375A/en
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    • 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
    • B04B11/02—Continuous feeding or discharging; Control arrangements therefor
    • 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
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl

Definitions

  • the present invention relates to a continuously operating screenless screw-type centrifuge, and, more particularly, to such a centrifuge for removing abrasive solids from cooling liquids.
  • centrifuges In order to remove finely divided solids or larger solid particles from a vehicle liquid, screw-type centrifuges are generally used. These centrifuges consist essentially of a drum and of a discharge screw arranged within the drum. The drum has predominantly the shape of a hollow conical frustrum within which the discharge screw is arranged with a slight distance being provided between the screw threads and the inner wall of the drums.
  • the solidscontaining vehicle liquid forms within the drum a hollow cylinder and the solids, clue to their higher specific gravity, are accelerated against the inner wall of the drum by the action of the centrifugal force.
  • the discharge of these solid particles is then effected in the direction towards one end of the drum by the relative movement of the discharge screw with respect to the drum.
  • the distance of the screw threads from the inner wall of the drum and, in particular, the value of the difference in speed of rotation between drum and screw must be adjusted in accordance with the nature, particle size, and quantity of the solids to be removed from the vehicle liquid.
  • a screw-type centrifuge in which a coupling is arranged between a gearing and the discharge screw and which can be engaged and disengaged during the centrifuging.
  • This coupling is preferably in the form of an electromagnetic clutch which is engaged and disengaged by means of a time-switch.
  • the drive of the discharge screw is effected by a friction drive which is maintained by the solids depositing on the inner wall of the centrifuge drum between the centrifuge drum and the discharge worm.
  • the operating properties, including the acceleration of the discharge screw are therefore dependent on the nature of the solids to be separated, as well as on the thickness of the layer in which the solids particles deposit on the centrifuge drum.
  • a driving of the discharge screw only commences upon the placing in operation of the centrifuge when, after a certain period of time, solids have already deposited on the inner wall of the centrifuge drum, so that the required frictional engagement with the discharge screw has been brought about. This operational behavior is extremely unsatisfactory, especially when abrasive solid particles are encountered, as discussed above.
  • a screw-type centrifuge particularly for separating abrasive solid particles from cooling liquids for the machining industry in which the centrifuge drum and the discharge screw are coupled directly with the drive device, and the differential speed between the two rotating elements is periodically varied automatically between zero and a given predetermined difference in speeds.
  • the centrifuge drum and the discharge screw are connected with each other via a freewheel and have a common drive which can be braked periodically during operation.
  • the periodic braking may be achieved by controlled reversal of phase of an electric drive motor, the control being effected by a timing relay, or by a mechanical brake acting directly on the drive.
  • FIGURE 1 is a longitudinal section through a screwtype centrifuge in accordance with the invention
  • FIGURE 2 is a cross-section along the line IIII of FIGURE 1;
  • FIGURE 3 is a cross-section along the line III-III of FIGURE 1.
  • the reference numeral 1 refers to a centrifuge housing 1, within which a centrifuge drum 2 is arranged for rotation about a vertical axis.
  • the centrifuge drum 2 has approximately the shape of an upward widening conical frustrum with an attached cylindrical portion.
  • the upper wall of the centrifuge housing 1 bears a stationary hollow hub 3 which extends vertically downwardly into the inside of the centrifuge drum 2 and has bearings 4 and 5 supporting drum 2.
  • a main drive shaft 8 which is supported in the upper housing wall at 6 and in the drum at 7, and is fixed to a discharge screw 9 to rotate same within the centrifuge drum 2.
  • a unidirectional freewheel coupling 10 so that the two rotating elements, namely, the centrifuge drum 2 and the discharge screw 9 can be driven jointly in the same direction by an electric motor 11 via a toothed belt 12.
  • the discharge screw 9 has, toward its bottom, a funnel-shaped extension 13 the inside of which has runner blades 14 in the manner of a flow pump.
  • the centrifuge housing 1 is arranged directly over a tank 15 into which the cooling liquid from which the solids are to be removed continuously flow so that a liquid level designated 16 is continuously maintained.
  • the funnel-shaped extension 13 of the discharge screw extends into the liquid level 16 so that, upon rotation of the discharge screw 9, the liquid is conveyed into the centrifuge drum 2 by the runner blades 14.
  • the screw threads of the discharge screw 9 are borne by a spider 17 between the arms of which the cooling liquid, conveyed by the funnelshaped extension 13, is passed into the inside of the drum.
  • the operation of the centrifuge is as follows.
  • the main drive shaft 8 and the discharge screw 9 are placed in rotation via the toothed belt 12, while at the same time the centrifuge drum 2 is placed in rotation in the same direction via the unidirectional freewheel coupling 10.
  • liquid is conveyed out of the tank 15 by the runner blades 14 into the inside of the drum as shown by the upwardly extending arrows in FIGURE 1, wherein the solids of the cooling liquid deposit on the inner wall of the centrifuge drum 2 as a result of the centrifugal force and their greater specific gravity.
  • the cleaned cooling liquid itself is forced through bore holes 18 in the drum into an upward separating chamber 19 of the centrifuge drum 2 from which it is withdrawn under pressure.
  • a change in phase is now effected on the electric motor 11 which is periodically controlled by a timing relay 20 and which causes a periodic delaying or braking of the rotation of main drive shaft 8, and therefore discharge screw 9. Since the centrifuge drum 2 is connected with the drive via the freewheel coupling 10 only in one direction of rotation it is not affected by this delay in rotation, but rather rotates with practically constant speed due to its inertia.
  • the switching times of the timing relay 20 can be lengthened or shortened, depending on the degree of solids in the liquid, so that the discharge screw 9 accordingly shows a difference in speed of rotation from the rotating centrifuge drum 2 only during the corresponding time intervals.
  • spring-loaded cone valves 23 are arranged in the drum wall of the centrifuge drum 2 both below and in the separating chamber 19. At the operating speed, the valve bodies 24 of these valves are pressed against their valve seat by the centrifugal force, so that the cone valves 23 are closed during operation.
  • the strength of the valve springs 25 is so designed that at about /a the operating speed the spring force of the valve springs 25 pushes the valve bodies 24 inwardly against the action of the centrifuge force and the cone valves 23 are thereby opened.
  • the cleaned liquid present within the drum gushes under high pressure through the valve opening so that, upon the final stopping of the centrifuge, the inner spaces of the drum are free of liquid. Due to the intensive flow through these valves, a depositing of solids and a clogging of the valves is prevented.
  • a device which controls the braking frequency of the main drive shaft as a function of the quantity of solids removed or to be removed in such a manner that the frequency increases with an increase of the solids in the cooling liquid.
  • a continuously operating screw-type centrifuge for separating solids from a liquid comprising a drive shaft rotatably mounted in said housing, means to drive said drive shaft in a predetermined direction, a housing, a tank disposed below said housing to initially receive said liquid, a centrifuge drum mounted for rotation within said housing, a discharge screw mounted for rotation within said housing and extending within said drum in a spaced relationship thereto, said discharge screw being fixed to said drive shaft for rotation therewith and extending into said tank for delivering the contents thereof into said housing for separation to solids and liquids, freewheel means operatively connecting said drum and said drive shaft during rotation of said drive shaft in said predetermined direction, and braking means for periodically braking said drive shaft during operation so that the speed of rotation of the said discharge screw lags at periodic time intervals behind the speed of rotation of the said drum.
  • the centrifuge according to claim 1 further comprising at least one spring-loaded cone valve provided in the wall of said drum and adapted to be closed under the action of a predetermined centrifugal force during operation and to open automatically at a given speed of rotation below the operating speed.
  • said drive means is in the form of an electric motor; and wherein said braking means includes means for selectively reversing the phase of the electric motor, and a timing relay for controlling the frequency of reversal of said phase.

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  • Centrifugal Separators (AREA)
US673688A 1967-06-02 1967-10-09 Continuously operating screenless screw-type centrifuge Expired - Lifetime US3424375A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET0034018 1967-06-02

Publications (1)

Publication Number Publication Date
US3424375A true US3424375A (en) 1969-01-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
US673688A Expired - Lifetime US3424375A (en) 1967-06-02 1967-10-09 Continuously operating screenless screw-type centrifuge

Country Status (7)

Country Link
US (1) US3424375A (xx)
JP (1) JPS527598B1 (xx)
CH (1) CH464800A (xx)
DE (1) DE1632325B1 (xx)
FR (1) FR1584544A (xx)
GB (1) GB1197128A (xx)
SE (1) SE346225B (xx)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741465A (en) * 1971-01-20 1973-06-26 Star Cutter Co Centrifugal separator with internal scraper blades
US3861584A (en) * 1973-06-20 1975-01-21 Donaldson Co Inc Self-purging centrifuge
US4155503A (en) * 1978-06-12 1979-05-22 Sears Edward A Separator for suspended solids
US4241866A (en) * 1978-06-01 1980-12-30 Heraeus Christ Gmbh Method of gently controlling braking of a centrifuge, and braking system
US5380266A (en) * 1991-11-27 1995-01-10 Baker Hughes Incorporated Feed accelerator system including accelerator cone
US5401423A (en) * 1991-11-27 1995-03-28 Baker Hughes Incorporated Feed accelerator system including accelerator disc
US5520605A (en) * 1991-12-31 1996-05-28 Baker Hughes Incorporated Method for accelerating a liquid in a centrifuge
US5651756A (en) * 1991-11-27 1997-07-29 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US5879279A (en) * 1996-09-05 1999-03-09 U.S. Centrifuge Centrifugal separator apparatus having a vibration sensor
WO2000059640A1 (en) * 1999-04-07 2000-10-12 Alfa Laval Ab A separation device
US6537191B1 (en) * 1998-06-15 2003-03-25 Alfa Laval Ab Centrifugal separator
US20050170943A1 (en) * 2002-03-21 2005-08-04 Alfa Laval Corporate Ab Centrifugal separator
US20100144508A1 (en) * 2007-05-10 2010-06-10 Alfa Laval Corporate Ab Method and device for cleaning of a fluid in a centrifugal separator
US20150283559A1 (en) * 2014-04-04 2015-10-08 Flottweg Se Solid-bowl screw-type centrifuge having a connecting flange
CN109562394A (zh) * 2016-07-19 2019-04-02 李晙硕 离心分离容器以及移动离心分离容器内的物质的方法
US10696918B2 (en) * 2013-12-10 2020-06-30 Alfa Laval Corporate Ab Continuous purification of motor oils using a three-phase separator
US11117338B2 (en) * 2018-05-11 2021-09-14 Easyquip Pty Ltd. Waste material compactor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4743226A (en) * 1983-04-29 1988-05-10 Geosource Inc. High capacity continuous solid bowl centrifuge
DE4321964A1 (de) * 1993-07-01 1995-01-12 Kloeckner Humboldt Deutz Ag Verfahren zum Betrieb von Schneckenzentrifugen
CN109046795A (zh) * 2018-09-25 2018-12-21 张家港市蓝鸟机械有限公司 一种卧螺沉降离心机
CN116480868B (zh) * 2023-06-20 2023-08-18 常州科德水处理成套设备股份有限公司 一种水处理弯管堵头机构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US930966A (en) * 1909-05-18 1909-08-10 Ernst Jahn Centrifugal apparatus for separating purposes.
US945592A (en) * 1909-04-05 1910-01-04 John W Phillips Centrifugal separator.
US1572299A (en) * 1923-06-18 1926-02-09 Fred W Mcentire Centrifugal separator
US3092582A (en) * 1959-03-20 1963-06-04 Black Clawson Co Centrifuge

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US945592A (en) * 1909-04-05 1910-01-04 John W Phillips Centrifugal separator.
US930966A (en) * 1909-05-18 1909-08-10 Ernst Jahn Centrifugal apparatus for separating purposes.
US1572299A (en) * 1923-06-18 1926-02-09 Fred W Mcentire Centrifugal separator
US3092582A (en) * 1959-03-20 1963-06-04 Black Clawson Co Centrifuge

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741465A (en) * 1971-01-20 1973-06-26 Star Cutter Co Centrifugal separator with internal scraper blades
US3861584A (en) * 1973-06-20 1975-01-21 Donaldson Co Inc Self-purging centrifuge
US4241866A (en) * 1978-06-01 1980-12-30 Heraeus Christ Gmbh Method of gently controlling braking of a centrifuge, and braking system
US4155503A (en) * 1978-06-12 1979-05-22 Sears Edward A Separator for suspended solids
US5651756A (en) * 1991-11-27 1997-07-29 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US5380266A (en) * 1991-11-27 1995-01-10 Baker Hughes Incorporated Feed accelerator system including accelerator cone
US5401423A (en) * 1991-11-27 1995-03-28 Baker Hughes Incorporated Feed accelerator system including accelerator disc
US5527258A (en) * 1991-11-27 1996-06-18 Baker Hughes Incorporated Feed accelerator system including accelerating cone
US5658232A (en) * 1991-11-27 1997-08-19 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US6077210A (en) * 1991-12-31 2000-06-20 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US5551943A (en) * 1991-12-31 1996-09-03 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US5840006A (en) * 1991-12-31 1998-11-24 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US5520605A (en) * 1991-12-31 1996-05-28 Baker Hughes Incorporated Method for accelerating a liquid in a centrifuge
US5632714A (en) * 1991-12-31 1997-05-27 Baker Hughes Inc. Feed accelerator system including accelerating vane apparatus
US5879279A (en) * 1996-09-05 1999-03-09 U.S. Centrifuge Centrifugal separator apparatus having a vibration sensor
US6716153B2 (en) * 1998-06-15 2004-04-06 Alfa Laval Ab Centrifugal separator for separating solids from a liquid mixture centrally fed through a gear device
US6537191B1 (en) * 1998-06-15 2003-03-25 Alfa Laval Ab Centrifugal separator
US6712751B2 (en) * 1998-06-15 2004-03-30 Alfa Laval Ab Centrifugal separator for separating solids from a liquid mixture centrally fed through a gear device
US6955637B1 (en) 1999-04-07 2005-10-18 Alfa Laval Ab Separation device having a centrifugal rotor
WO2000059640A1 (en) * 1999-04-07 2000-10-12 Alfa Laval Ab A separation device
US20050170943A1 (en) * 2002-03-21 2005-08-04 Alfa Laval Corporate Ab Centrifugal separator
US7118521B2 (en) * 2002-03-21 2006-10-10 Alfa Laval Corporate Ab Centrifugal separator with conical pump inlet
US20100144508A1 (en) * 2007-05-10 2010-06-10 Alfa Laval Corporate Ab Method and device for cleaning of a fluid in a centrifugal separator
US8790233B2 (en) * 2007-05-10 2014-07-29 Alfa Laval Corporate Ab Method and device for cleaning of a fluid in a centrifugal separator
US10696918B2 (en) * 2013-12-10 2020-06-30 Alfa Laval Corporate Ab Continuous purification of motor oils using a three-phase separator
US20150283559A1 (en) * 2014-04-04 2015-10-08 Flottweg Se Solid-bowl screw-type centrifuge having a connecting flange
US9381522B2 (en) * 2014-04-04 2016-07-05 Flottweg Se Solid-bowl screw-type centrifuge having a connecting flange
CN109562394A (zh) * 2016-07-19 2019-04-02 李晙硕 离心分离容器以及移动离心分离容器内的物质的方法
CN109562394B (zh) * 2016-07-19 2021-08-17 李晙硕 离心分离容器以及移动离心分离容器内的物质的方法
US11117338B2 (en) * 2018-05-11 2021-09-14 Easyquip Pty Ltd. Waste material compactor

Also Published As

Publication number Publication date
CH464800A (de) 1968-10-31
JPS527598B1 (xx) 1977-03-03
GB1197128A (en) 1970-07-01
DE1632325B1 (de) 1970-05-27
FR1584544A (xx) 1969-12-26
SE346225B (xx) 1972-07-03

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