US3858794A - Sludge centrifuge - Google Patents
Sludge centrifuge Download PDFInfo
- Publication number
- US3858794A US3858794A US454002A US45400274A US3858794A US 3858794 A US3858794 A US 3858794A US 454002 A US454002 A US 454002A US 45400274 A US45400274 A US 45400274A US 3858794 A US3858794 A US 3858794A
- Authority
- US
- United States
- Prior art keywords
- outlet
- valve
- rotor
- liquid
- 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
Links
Images
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
-
- 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
-
- 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
- B04B15/00—Other accessories for centrifuges
- B04B15/06—Other accessories for centrifuges for cleaning bowls, filters, sieves, inserts, or the like
-
- 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
- B04B2001/2083—Configuration of liquid outlets
Definitions
- the centrifugal rotor has a level-maintaining outlet for clean-separated liquid, a peripheral outlet at the greatest radius of the inside of the rotor wall, and a conical screw operable in the rotor to convey separated sludge for discharge from a region of the rotor remote from said outlets.
- a valve coacting with the peripheral outlet is associated with control means operable by the action of liquid discharged from the level-maintaining outlet to maintain the valve in condition to close the peripheral outlet, the valve being operable in response to interruption of the liquid discharge from the levelmaintaining outlet to open the peripheral outlet and thereby effect removal of deposits on the conveyor screw.
- the present invention relates to a sludge centrifuge equipped with a liquid-level-maintaining outlet for clean-separated liquid as well as with a conical screw coaxial with the centrifuge rotor and feeding separated sludge to an outlet located closer to the axis of rotation of the centrifuge rotor than said liquid outlet, the cen trifuge also having an outlet which can be opened intermittently and is located at the greatest radius of the inside of the wall of the centrifuge rotor.
- a centrifuge of this kind is disclosed in the Swedish patent specification 310,624.
- a centrifuge of the above-mentioned kind is of special interest for the separation of a sludge-containing liquid which, in addition to sludge with a higher specific gravity than the liquid, contains sludge with a lower specific gravity than the liquid.
- this lighter sludge may consist of sticky substances, such as fat, which deposit on the screw and fill its threads, whereby a further running of the centrifuge is made impossible.
- the new centrifuge is characterized by a valve inserted in said outlet which can be opened intermittently, said valve being arranged to be kept closed under the action of liquid discharged from the levelmaintaining outlet.
- a first such embodiment is characterized in that the valvecontrolled outlet has a radially outer opening forming.
- a valve seat and that a double-armed lever, arranged on the outside of the centrifuge rotor, is journalled so that a valve body carried by one end of the lever is movable radially relatively to said valve seat, the other end of the lever being arranged to be actuated by liquid discharged from the level-maintaining outlet.
- a second embodiment is characterized in that the valve-controlled outlet has a radially outer opening forming a valve seat for a radially movable valve body and that a channel, provided with a drainhole, leads from the level-maintaining outlet to the radially outer end of the valve body.
- a third embodiment is characterized in that the valve-controlled outlet opens into a vortex fluidistor, located radially outside this outlet, the tangentially arranged inlet for the control liquid of the fluidistor communicating with the level-maintaining outlet.
- a fourth embodiment is characterized in that the valve-controlled outlet has an axially directed, outer opening forming a valve seat for a valve body which is axially movable in a chamber as a piston, the chamber thus having an axially inner and an axially outer end, there being a channel leading from the levelmaintaining outlet to the outer end of the chamber, and each end of the chamber being provided with a drainhole.
- FIGS. 1 through 4 are axial sectional views of parts of four different embodiments, chosen by way of example, of the rotor of the present centrifuge. Corresponding details in the different figures have the same reference numerals.
- reference numeral 1 designates a centrifuge rotor having a horizontal axis of rotation 2.
- a conventional conical screw 3 feeds sludge, deposited on the inside of the rotor, to the left to the usual outlet (not shown) which is located closer to the axis of rotation than an outlet 4 for clean-separated liquid.
- the liquid to be separated is supplied through the usual inlet (not shown).
- the outlet 4 is formed by a hole located eccentrically in a disc 5 which is inserted in the righthand end wall of the rotor and which is adjustable by being rotated.
- the distance of the liquid outlet 4 from the axis of rotation 2 can be varied in a desired manner.
- a double-armed lever 7 is journalled on a bracket on the outside of the rotor wall.
- the left-hand end of the lever carries a valve body 8, the hole 6 opening into a valve seat for the valve body 8.
- the right-hand end of the lever has the shape of a scoop 9, which catches liquid discharging from the overflow outlet 4.
- the valve 6, 8 is kept closed as long as liquid discharges through the overflow outlet 4 (i.e., as long as rotor l continues to receive a supply of the liquid to be separated).
- the liquid supply to the rotor is interrupted without the centrifuge being stopped. Liquid then ceases to act upon the scoop 9, and the valve 6, 8 opens under the pressure of the liquid 10 present in the rotor. The latter is then emptied of all liquid through the hole 6, and the fat or similar sticky, light material stuck in the threads of screw 3 is thrown from the latter by centrifugal force and hits the inside of the rotors peripheral wall, whence the screw feeds the material to the sludge outlet. After this cleaning has taken place, the supply to the rotor of the liquid to be separated is resumed, the supply rate appreciably exceeding the discharge rate which is possible through the hole 6.
- ll designates an annular chute arranged on the outside of the end wall and catching a part of the liquid discharging from the overflow outlet 4.
- the main part of the liquid from the outlet 4 flows. over the edge of the chute II.
- a channel 12 leads from this chute to the radially outer end of a radially guided valve body 13, for which the hole 6 serves as a valve seat.
- the channel 12 has a drain hole 14.
- a recess 16 is provided in the annular member 15 in which the channel 12 and chute 11 are formed.
- FIG. 3 shows a variation of the embodiment according to FIG. 2, in that the valve body in FIG. 2 has been replaced by a vortex fluidistor whose cavity 17, as seen in radial direction, has a circular shape.
- the channel 12 opens tangentially into the fluidistor, as indicated at 18, and supplies control liquid from the chute 11.
- the whirl formation in the fluidistor cavity 17 generates such a great flow resistance against discharge of liquid through the hole 6 that the outflow through the latter is small.
- the chute 11 is drained through the passage l2, l8, l4, whereupon the whirl movement in cavity 17 ceases and the flow resistance in the passage 6, 17, 14 is strongly reduced so that the centrifuge rotor l is emptied through the hole 14.
- l9 designates a valve housing secured to rotor 1 and in which there is arranged an axially movable valve body 20 provided with a labyrinth sea].
- an axial channel 21 in which a tube 22 is inserted, this tube serving as a valve seat for the valve body 20.
- the chute 11 is like the chutes 11 in FIGS. 2 and 3.
- the space 23 in which the valve body 20 moves has a liquid inlet 24 from the chute l1 and two drain holes 25 and 26, one at each end of the space 23.
- the valve 20 22 is kept closed, since the right-hand end of the valve body 20 has a greater surface area acted upon by liquid than its left-hand end.
- the valve body 20 is pressed to the right and the liquid 10 is emptied through the drain hole 25.
- screw 3 is rotated at a different speed than the rotor l, in order to convey the separated sludge to the left toward the sludge outlet.
- Those details of the centrifuge not illustrated are well known in the art, as disclosed, for example, in U.S. Pat. Nos. 3,447,742 and 3,506,187 dated June 3, 1969, and Apr. 14, 1970, respectively.
- a centrifugal rotor for receiving a sludge-containing liquid to be separated, the rotor being mounted for rotation about an axis and having a liquid-level-maintaining outlet for clean-separated liquid, the rotor also having a peripheral outlet located at the greatest radius of the inside of the rotor wall, a conical screw mounted in the rotor coaxially thereof and operable to convey separated sludge for discharge from the rotor at a region thereof remote from said outlets, a valve coacting with said peripheral outlet for opening and closing the same, and control means associated with said valve and operable by the action of liquid discharged from said levelmaintaining outlet to maintain the valve in condition to close said peripheral outlet, said valve operating to open said peripheral outlet in response to interruption of the liquid discharge from the level-maintaining outlet.
- control means including a doublearmed lever mounted on the outside of said rotor and carrying said valve on one arm of the lever, the other arm of the lever being in position to be actuated by liquid discharged from the level-maintaining outlet.
- control means include a vortex fluidistor located radially outside said peripheral outlet and into which said peripheral outlet opens, the fluidistor having a generally circular cavity and a passage leading from the levelmaintaining outlet and opening tangentially into said cavity.
Landscapes
- Centrifugal Separators (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7304026A SE371110B (da) | 1973-03-22 | 1973-03-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3858794A true US3858794A (en) | 1975-01-07 |
Family
ID=20316991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US454002A Expired - Lifetime US3858794A (en) | 1973-03-22 | 1974-03-22 | Sludge centrifuge |
Country Status (4)
Country | Link |
---|---|
US (1) | US3858794A (da) |
JP (1) | JPS5041163A (da) |
DE (1) | DE2409917A1 (da) |
SE (1) | SE371110B (da) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4190194A (en) * | 1978-07-28 | 1980-02-26 | Bird Machine Company, Inc. | Solids liquid separating centrifuge with solids classification |
US4339072A (en) * | 1979-10-20 | 1982-07-13 | Klockner-Humboldt-Deutz Ag | Centrifuge for separating solids/liquids mixtures |
US4416655A (en) * | 1981-01-19 | 1983-11-22 | The Chartwell House Group Limited | Centrifuges and centrifuge cleaning methods |
EP0182150A2 (en) * | 1984-11-15 | 1986-05-28 | Pennwalt Corporation | Centrifuge employing variable height discharge weir |
US5169377A (en) * | 1989-04-07 | 1992-12-08 | Kloeckner-Humboldt-Deutz Aktiengesellschaft | Centrifuge for the continuous separation of substances that differ in density |
WO1993005884A1 (de) * | 1991-09-16 | 1993-04-01 | Flottweg Gmbh | Zentrifuge zur kontinuierlichen trennung von stoffen unterschiedlicher dichte |
US5217428A (en) * | 1989-06-29 | 1993-06-08 | Kloeckner-Humboldt-Deutz Aktiengesellschaft | Weir for setting the liquid level in solid bowl centrifuges |
US20040058796A1 (en) * | 2000-05-05 | 2004-03-25 | Bernward Feldkamp | Solid bowl centrifuge for separating mixtures of liquids and solids |
US20050164861A1 (en) * | 2002-01-30 | 2005-07-28 | Paul Bruning | Full-jacket helix centrifuge with a weir |
US20110039680A1 (en) * | 2008-04-16 | 2011-02-17 | Alfa Laval Corporate Ab | Centrifugal separator |
US20120028782A1 (en) * | 2008-12-30 | 2012-02-02 | Alfa Laval Corporate Ab | Power rings |
EP2902112A1 (de) * | 2014-01-31 | 2015-08-05 | Flottweg SE | Auslassvorrichtung einer Vollmantelschneckenzentrifuge |
EP2331264A4 (en) * | 2008-08-15 | 2016-07-20 | Mi Llc | CENTRIFUGE |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19618249A1 (de) * | 1996-05-07 | 1997-11-13 | Deutz Ag | Schneckenzentrifuge mit Fliehkraft-Ventil |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1844917A (en) * | 1930-02-27 | 1932-02-09 | Fawcett Harold William | Centrifugal separator |
US1921181A (en) * | 1930-06-06 | 1933-08-08 | Fawcett Harold William | Centrifugal separator |
US3254805A (en) * | 1963-08-01 | 1966-06-07 | Lloyd D Barger | Adjustable liquid metering device having a fluid container subjected to intermittent internal pressures different from that of atmospheric pressure |
US3545468A (en) * | 1969-05-06 | 1970-12-08 | Bowles Eng Corp | Liquid level controller employing vortex valve |
-
1973
- 1973-03-22 SE SE7304026A patent/SE371110B/xx unknown
-
1974
- 1974-03-01 DE DE2409917A patent/DE2409917A1/de active Pending
- 1974-03-22 JP JP49032466A patent/JPS5041163A/ja active Pending
- 1974-03-22 US US454002A patent/US3858794A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1844917A (en) * | 1930-02-27 | 1932-02-09 | Fawcett Harold William | Centrifugal separator |
US1921181A (en) * | 1930-06-06 | 1933-08-08 | Fawcett Harold William | Centrifugal separator |
US3254805A (en) * | 1963-08-01 | 1966-06-07 | Lloyd D Barger | Adjustable liquid metering device having a fluid container subjected to intermittent internal pressures different from that of atmospheric pressure |
US3545468A (en) * | 1969-05-06 | 1970-12-08 | Bowles Eng Corp | Liquid level controller employing vortex valve |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4190194A (en) * | 1978-07-28 | 1980-02-26 | Bird Machine Company, Inc. | Solids liquid separating centrifuge with solids classification |
FR2437880A1 (fr) * | 1978-07-28 | 1980-04-30 | Bird Machine Co | Centrifugeuse destinee a la separation et au tri de corps solides presents dans un milieu liquide |
US4339072A (en) * | 1979-10-20 | 1982-07-13 | Klockner-Humboldt-Deutz Ag | Centrifuge for separating solids/liquids mixtures |
US4416655A (en) * | 1981-01-19 | 1983-11-22 | The Chartwell House Group Limited | Centrifuges and centrifuge cleaning methods |
EP0182150A2 (en) * | 1984-11-15 | 1986-05-28 | Pennwalt Corporation | Centrifuge employing variable height discharge weir |
EP0182150A3 (en) * | 1984-11-15 | 1987-12-23 | Pennwalt Corporation | Centrifuge employing variable height discharge weir |
US5169377A (en) * | 1989-04-07 | 1992-12-08 | Kloeckner-Humboldt-Deutz Aktiengesellschaft | Centrifuge for the continuous separation of substances that differ in density |
US5217428A (en) * | 1989-06-29 | 1993-06-08 | Kloeckner-Humboldt-Deutz Aktiengesellschaft | Weir for setting the liquid level in solid bowl centrifuges |
WO1993005884A1 (de) * | 1991-09-16 | 1993-04-01 | Flottweg Gmbh | Zentrifuge zur kontinuierlichen trennung von stoffen unterschiedlicher dichte |
US5618409A (en) * | 1991-09-16 | 1997-04-08 | Flottweg Gmbh | Centrifuge for the continuous separation of substances of different densities |
US20040058796A1 (en) * | 2000-05-05 | 2004-03-25 | Bernward Feldkamp | Solid bowl centrifuge for separating mixtures of liquids and solids |
US20050164861A1 (en) * | 2002-01-30 | 2005-07-28 | Paul Bruning | Full-jacket helix centrifuge with a weir |
US7326169B2 (en) * | 2002-01-30 | 2008-02-05 | Westfalia Separator Ag | Full-jacket helix centrifuge with a weir |
US20110039680A1 (en) * | 2008-04-16 | 2011-02-17 | Alfa Laval Corporate Ab | Centrifugal separator |
US8157716B2 (en) * | 2008-04-16 | 2012-04-17 | Alfa Laval Corporate Ab | Centrifugal separator for recovery of kinetic energy from a discharged liquid |
EP2331264A4 (en) * | 2008-08-15 | 2016-07-20 | Mi Llc | CENTRIFUGE |
US9908125B2 (en) | 2008-08-15 | 2018-03-06 | M-1 L.L.C. | Centrifuge and changeable weir inserts therefor |
US20120028782A1 (en) * | 2008-12-30 | 2012-02-02 | Alfa Laval Corporate Ab | Power rings |
US9028387B2 (en) * | 2008-12-30 | 2015-05-12 | Alfa Laval Corporate Ab | Decanter centrifuge with energy recovery structure |
EP2902112A1 (de) * | 2014-01-31 | 2015-08-05 | Flottweg SE | Auslassvorrichtung einer Vollmantelschneckenzentrifuge |
US20150217303A1 (en) * | 2014-01-31 | 2015-08-06 | Flottweg Se | Outlet device of a solid-bowl screw centrifuge |
US10293347B2 (en) * | 2014-01-31 | 2019-05-21 | Flottweg Se | Solid-bowl screw centrifuge with an outlet device having a restrictor controlled by a floating body that floats on a liquid level of the material being separated in the centrifuge to automatically adjust the outlet in dependence on a throughput of the material |
Also Published As
Publication number | Publication date |
---|---|
JPS5041163A (da) | 1975-04-15 |
SE371110B (da) | 1974-11-11 |
DE2409917A1 (de) | 1974-09-26 |
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