US3550843A - Sludge centrifuge - Google Patents

Sludge centrifuge Download PDF

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Publication number
US3550843A
US3550843A US803319*A US3550843DA US3550843A US 3550843 A US3550843 A US 3550843A US 3550843D A US3550843D A US 3550843DA US 3550843 A US3550843 A US 3550843A
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United States
Prior art keywords
chamber
liquid
valve
outlet
space
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Expired - Lifetime
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US803319*A
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English (en)
Inventor
Walter Hoffmann
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Alfa Laval AB
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Alfa Laval AB
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    • 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
    • B04B1/14—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 with periodical discharge
    • B04B1/16—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 with periodical discharge with discharging outlets controlled by the rotational speed of the bowl
    • B04B1/18—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 with periodical discharge with discharging outlets controlled by the rotational speed of the bowl controlled by the centrifugal force of an auxiliary liquid

Definitions

  • a second valve is hydraulically actuated to open this operating liquid outlet and is urged by a biasing means in the direction for closing the latter outlet, the rotor also having a chamber so located and dimensioned that a liquid substantially filling this chamber acts to urge the second valve in its closing direction with a force in addition to the force of said biasing means.
  • This invention relates to sludge centrifuges of the type in which separated sludge is discharged from the centrifugal rotor intermittently under control of a first valve actuated hydraulically by an operating liquid for which the rotor has a separate outlet adapted to be opened by hydraulic actuation of a second valve, the rotor having biasing means for urging the second valve in the direction for closing the operating liquid outlet.
  • a centrifuge of this type is disclosed in Swedish Pat. No. 125,439.
  • the closing of the second valve of this centrifuge is effected by means of biasing springs after the main portion of the operating liquid has discharged through the outlet.
  • this stage is passed relatively slowly.
  • the closing of the second valve will take place with an undesired delay.
  • a more rapid closing of the second valve is effected by subjecting it to a hydraulic actuation in the closing direction. More particularly, at the moment when the closing is to be effected, a liquid is supplied to a chamber so located in the rotor andhaving such a radial extension that liquid substantially filling the chamber is operable to give the second valve an additional actuation in the closing direction.
  • the chamber is located in the discharge path of the operating liquid which actuates the first valve. Due to the fact that the chamber is filled with liquid in this way, a closing hydraulic actuation of the second valve is obtained very rapidly and at a correct point of time.
  • the total discharge is desired when sludge deposits caked together are to be, removed from the sludge space, and the partial discharge is desired when only deposited sludge and not separating liquid is to be discharged.
  • the partial discharge allows uninterrrupted supply of separating liquid to the centrifuge, without liquid losses occurring.
  • the total discharge can be obtained by giving the chamber such a volume that it can receive all operating liquid flowing from the outlet of the first valve, without the second valve being actuated in its closing direction.
  • the closing of the second valve is obtained automatically when the liquid acting to open this valve is drained from the space where it effects the opening force, but such closing of the second valve can be accelerated by supplying additionaloperating liquid to the chamber through a separate channel at the correct moment.
  • a desired partial discharge can be obtained by supplying a limited quantity or a limited flow of operating liquid, corresponding to this partial discharge, to the chamber through the separate channel. In this way, a controlled prefilling of the chamber is effected whereby the outlet from the first valve is closed before the total content of the separating space has been discharged.
  • the chamber has a starting or minimum liquid level provided by an overflow outlet with limited outlet area and which is located, calculated radially, inside the outer part of the chamber; and the additional operating liquid, corresponding to the desired degree of partial discharge, is supplied to and builds up from this starting level.
  • the overflow outlet In order to make it possible to adapt this overflow outlet to different operational situations, it is made adjustable in the radial direction, preferably in such a way that it can be screwed radially inward or outward by actuation from the outside of the centrifuge rotor.
  • rings of solid material can be placed in the chamber the volume of these rings corresponding to the prefilling volume which, as noted above, is determined by the position of the overflow outlet.
  • FIG. 1 is an axial sectional view of the main part of the lefthand half of an embodiment of the new centrifuge
  • FIG. 2 is a similar view showing a fragment of a modified embodiment.
  • corresponding details have thesame reference numerals.
  • a rotor body l is provided with a cover 2 secured by a locking ring 3.
  • a set of conical discs 5 is provided in the separating space 4, and the liquid to be separated is supplied from above through a distributor 6.
  • the centrifuge is mounted on and driven by a spindle 7.
  • the rotor wall has sludge outlet openings 8 which are closed by a piston valve 9 when it is actuated upwardly by means of operating liquid supplied through a stationary pipe 10 to a space 11 at the underside of the valve 9.
  • a ring valve 13 is pressed upward by springs spaced around the rotor axis and of which one is shown at 12. In the upper position of valve 13, its cushions 14 (made of nylon, for example) keep outlets 15 from the space 11 closed.
  • a space 16 above the valve 13 is drained through throttled outlets 17.
  • An annular chamber 18 with throttled outlets 19 is provided in the rotor wall at the underside of the valve 13.
  • An annular chamber 20 with three different overflow outlets 21, 22 and 23 is provided in the central portion of the rotor bottom.
  • An additional stationary pipe 24 for the supply of operating liquid opens into the chamber 20, and from the chamber 20 a channel 25 leads to the space above the valve 13 and a channel 26 leads to the chamber 18.
  • a slot between the ring valve 13 and an annular ridge 18b on the rotor bottom is designated by 18a.
  • the space 16 communicates with the chamber 18 through channels 27 which pass through the ring valve 13 and the openings of which at the upper sideof the ring valve are located between the cushions l4.
  • the chamber 18 is provided with an overflow outlet 28 in the form of a pipe piece, which can be screwed radially inward or outward.
  • the liquid contained in the space 11 flows (together with the smaller quantity of liquid supplied through the channel 25) downward into the chamber 18 via the channels 27.
  • the latter chamber has such a large volume that it can receive the whole quantity of liquid passed into the chamber, without the liquid level in the chamber 18 being displaced so far inward that the pressure generated by the liquid causes closing of the valve 13.
  • the latter is closed by the springs 12 when the liquid in the space 16 has been drained through the outlets 17. In this case, there occurs a total discharge of the content of the separating space.
  • a partial discharge of the content of the separating space 4 is desired, a limited quantity or a limited flow of liquid is supplied through the pipe 24, when a sludge discharge is to be effected.
  • the liquid supply through the pipe 24 can cause the liquid level in the chamber 18 to fluctuate.
  • the arrangement according to FIG. 2 is provided in the chamber 18 with an overflow outlet 28 having a limited cross section in the form of a pipe piece which can be screwed in the radial direction. This means that operating liquid, entering from the pipe 24, fills the chamber 18 only to a level which is determined by the position of the inner opening of the pipe piece 28. Operating liquid, entering with high velocity from the space 11, now fills the chamber 18 from a level (determined by the overflow outlet 28), with the result that the valve 13 is closed after a more exact space of time than is possible in the embodiment according to FIG. 1.
  • the said space of time can, according to the desired degree of partial discharge, be adjusted by screwing the pipe piece 28 inward or outward.
  • Another possibility of attaining a desired degree of partial discharge is to change the volume of the outflow path of the liquid upstream from the chamber 18, for example, by means of insertion bodies (not shown).
  • a sludge centrifuge comprising a rotor provided with an outlet for discharge of centrifugally separated sludge, a first valve movable hydraulically to open and close said sludge outlet, the rotor having an outlet for an operating liquid by which said valve is actuated, a second valve for opening and closing said operating liquid outlet, the second valve being hydraulically actuated to open the operating liquid .outlet, means for biasing the second valve in the direction for closing the operating liquid outlet, the rotor also having a chamber so located and dimensioned that a liquid substantially filling said chamber acts to urge the second valve in said closing direction with a force in addition to the force of said biasing means, and means for substantially filling said chamber with a liquid.
  • a centrifuge according to claim 1 in which said chamber is disposed in the path of liquid flowing through said operating liquid outlet.
  • a centrifuge according to claim 1 in which said chamber has a throttled outlet.
  • a centrifuge according to claim 1 in which said chamber is disposed in the path of liquid flowing through said operating liquid outlet, and is adapted to receive all of the flow through said operating liquid outlet without said second valve being actuated in its said closing direction.
  • a centrifuge according to claim 1 in which said means for substantially filling said chamber include a separate channel in the rotor for supplying liquid to said chamber.
  • a centrifuge according to claim 1 in which said means for substantially filling said chamber include a separate channel in the rotor leading to the chamber, and means for supplying liquid to said separate channel.
  • a centrifuge according to claim 1 in which said chamber has an overflow outlet of limited outlet area and located radially between the rotor axis and the outer part of said chamber.

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  • Centrifugal Separators (AREA)
US803319*A 1968-02-29 1970-02-28 Sludge centrifuge Expired - Lifetime US3550843A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2599/68A SE321896B (es) 1968-02-29 1968-02-29

Publications (1)

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US3550843A true US3550843A (en) 1970-12-29

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ID=20260262

Family Applications (1)

Application Number Title Priority Date Filing Date
US803319*A Expired - Lifetime US3550843A (en) 1968-02-29 1970-02-28 Sludge centrifuge

Country Status (8)

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US (1) US3550843A (es)
BR (1) BR6906772D0 (es)
CH (1) CH481679A (es)
DE (1) DE1909996C2 (es)
FR (1) FR2002932A1 (es)
GB (1) GB1197276A (es)
NL (1) NL6902990A (es)
SE (1) SE321896B (es)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765599A (en) * 1970-10-02 1973-10-16 Westfalia Separator Ag Self cleaning centrifuge drum with stepwise variable closing pressure
US4083488A (en) * 1976-03-09 1978-04-11 Westfalia Separator Ag Centrifugal separator having hydraulically operated outlet valves
US4143806A (en) * 1977-08-30 1979-03-13 Mitsubishi Kakoki Kaisha Ltd. Centrifugal separator
US4410317A (en) * 1981-05-15 1983-10-18 Westfalia Separator Ag Self-discharging centrifugal drum
US4479788A (en) * 1982-11-06 1984-10-30 Westfalia Separator Ag Centrifuge with a self-emptying drum
US4505700A (en) * 1983-02-16 1985-03-19 Westfalia Separator Ag Centrifuge with a self-emptying drum
US4514183A (en) * 1982-03-11 1985-04-30 Westfalia Separator Ag Centrifuge with self-emptying drum
US4643708A (en) * 1984-09-06 1987-02-17 Alfa-Laval Separation Ab Centrifuge operating system
US4670005A (en) * 1985-03-14 1987-06-02 Westfalia Separator Ag Centrifuge with a self-emptying drum
US20040023783A1 (en) * 2001-01-19 2004-02-05 Willi Niemerg Centrifuge
US20070066476A1 (en) * 2003-07-10 2007-03-22 Westfalia Separator Ag Centrifuge comprising a separator disc stack and separator disc
US20070135289A1 (en) * 2004-10-21 2007-06-14 Wilfried Mackel Separator having a centrifugal drum and a piston slide
US9387491B2 (en) * 2013-03-06 2016-07-12 Alfa Laval Corporate Ab Centrifugal separator having a valve body provided in an outlet channel
US20190358651A1 (en) * 2016-06-14 2019-11-28 Alfa Laval Corporate Ab Centrifugal separator with dismountable bowl-hood
US10654050B1 (en) * 2019-05-21 2020-05-19 Empirical Innovations, Inc. Centrifugal separators and separation methods employing multiple pistons and facilitating intermediate material ejection

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510052A (en) * 1984-02-03 1985-04-09 Alfa-Laval Separation Ab Operating system for centrifugal separators
DE3524731C1 (de) * 1985-07-11 1986-11-27 Westfalia Separator Ag, 4740 Oelde Zentrifuge mit einer selbstentleerenden Schleudertrommel
DE4016577A1 (de) * 1989-09-14 1991-03-28 Josef Eichhammer Arbeitsgeraet
DE4436459C2 (de) * 1994-10-12 1997-04-24 Flottweg Gmbh Schleudertrommel
DE10233807B3 (de) * 2002-07-25 2004-02-12 Westfalia Separator Ag Separator mit selbstentleerender Schleudertrommel
DE102008051867A1 (de) 2007-10-17 2009-04-23 Gea Westfalia Separator Gmbh Zentrifuge und Trennteller
DE102007056575A1 (de) 2007-11-23 2009-05-28 Gea Westfalia Separator Gmbh Zentrifuge mit einem Trenntellerpaket und Trennteller
DE102008048934A1 (de) 2008-09-25 2010-04-01 Gea Westfalia Separator Gmbh Zentrifuge mit einer selbstentleerenden Schleudertrommel

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB662451A (en) * 1948-01-30 1951-12-05 Separator Ab Improvements in centrifuges
DE1003650B (de) * 1953-08-29 1957-02-28 Separator Ab Steuereinrichtung fuer Trennschleudern mit intermittierender Schlammaustragung aus der Trommel
DE963139C (de) * 1954-03-13 1957-05-02 Westfalia Separator Ag Schnellschlussventil fuer Schlammzentrifugen mit periodischer Schlammaustragung

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765599A (en) * 1970-10-02 1973-10-16 Westfalia Separator Ag Self cleaning centrifuge drum with stepwise variable closing pressure
US4083488A (en) * 1976-03-09 1978-04-11 Westfalia Separator Ag Centrifugal separator having hydraulically operated outlet valves
US4143806A (en) * 1977-08-30 1979-03-13 Mitsubishi Kakoki Kaisha Ltd. Centrifugal separator
US4410317A (en) * 1981-05-15 1983-10-18 Westfalia Separator Ag Self-discharging centrifugal drum
US4514183A (en) * 1982-03-11 1985-04-30 Westfalia Separator Ag Centrifuge with self-emptying drum
US4479788A (en) * 1982-11-06 1984-10-30 Westfalia Separator Ag Centrifuge with a self-emptying drum
US4505700A (en) * 1983-02-16 1985-03-19 Westfalia Separator Ag Centrifuge with a self-emptying drum
US4643708A (en) * 1984-09-06 1987-02-17 Alfa-Laval Separation Ab Centrifuge operating system
US4670005A (en) * 1985-03-14 1987-06-02 Westfalia Separator Ag Centrifuge with a self-emptying drum
US6827680B2 (en) * 2001-01-19 2004-12-07 Westfalia Separator Ag Centrifuge
US20040023783A1 (en) * 2001-01-19 2004-02-05 Willi Niemerg Centrifuge
US20070066476A1 (en) * 2003-07-10 2007-03-22 Westfalia Separator Ag Centrifuge comprising a separator disc stack and separator disc
US20070135289A1 (en) * 2004-10-21 2007-06-14 Wilfried Mackel Separator having a centrifugal drum and a piston slide
US7354388B2 (en) 2004-10-21 2008-04-08 Westfalia Separator Ag Separator having a centrifugal drum and a piston slide
CN1905945B (zh) * 2004-10-21 2010-06-16 威斯特伐利亚分离器股份公司 具有离心滚筒和活塞式滑阀的分离器
US9387491B2 (en) * 2013-03-06 2016-07-12 Alfa Laval Corporate Ab Centrifugal separator having a valve body provided in an outlet channel
US20190358651A1 (en) * 2016-06-14 2019-11-28 Alfa Laval Corporate Ab Centrifugal separator with dismountable bowl-hood
US10933432B2 (en) * 2016-06-14 2021-03-02 Alfa Laval Corporate Ab Centrifugal separator with bowl hood dismountable via pressure media
US10654050B1 (en) * 2019-05-21 2020-05-19 Empirical Innovations, Inc. Centrifugal separators and separation methods employing multiple pistons and facilitating intermediate material ejection
US11000859B2 (en) * 2019-05-21 2021-05-11 Empirical Innovations, Inc. Drum and ejection control arrangements for centrifugal separators and separation methods employing multiple pistons to control separate intermittent ejection of heavy and intermediate material
US20210260606A1 (en) * 2019-05-21 2021-08-26 Empirical Innovations, Inc. Centrifugal separators and separation methods providing intermediate material ejection control

Also Published As

Publication number Publication date
DE1909996A1 (de) 1970-01-08
CH481679A (de) 1969-11-30
DE1909996C2 (de) 1985-03-21
BR6906772D0 (pt) 1973-01-02
NL6902990A (es) 1969-09-02
FR2002932A1 (fr) 1969-10-31
SE321896B (es) 1970-03-16
GB1197276A (en) 1970-07-01

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