US3079069A - Self-opening sludge centrifuge - Google Patents

Self-opening sludge centrifuge Download PDF

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Publication number
US3079069A
US3079069A US812272A US81227259A US3079069A US 3079069 A US3079069 A US 3079069A US 812272 A US812272 A US 812272A US 81227259 A US81227259 A US 81227259A US 3079069 A US3079069 A US 3079069A
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United States
Prior art keywords
valve
slide
bowl
liner
sludge
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Expired - Lifetime
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US812272A
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Thylefors Henric Wilhelm
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Alfa Laval Holdings Amsterdam AB
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Separator 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/08—Rotary bowls
    • B04B7/12—Inserts, e.g. armouring plates

Definitions

  • the present invention relates to centrifugal separators f the type having a controllable sludge discharge system, and more particularly to such separators in which the rotating bowl has a slide-valve movable axially of the bowl so as to alternately cover and uncover sludge discharge openings in the peripheral portion of the bowl.
  • Centrifuges of this type are well known in the art, as shown, for example, in Bjornstjerna Patent No. 2,178,547, dated November 7, 1939.
  • the principal object of my invention is to provide a centrifuge of the type described which overcomes the above-noted difliculties.
  • the slide-valve is provided within the bowl with a detachable liner which serves as protection against erosion; and this liner, in turn, is provided with a generally radially directed outer sealing flange covering what would otherwise be the sealing surface of the slide-valve flange.
  • the liner is preferably secured to the slide-valve by releasable means located radially inward from the outer sealing flange of the liner, that is, at an inner region where the effect of erosion from sludge is substantially reduced or non-existent.
  • the centrifugal bowl 1 is adapted for rotation about its central vertical axis A.
  • the bowl cover 2 is locked to the bowl by means of a locking ring 3.
  • a set of conical discs, indicated at 4 rests on a distributor 5 forming a central feed passage 5:2. for the material to be separated.
  • the distributor 5 On its lower surface, the distributor 5 carries radial impeller vanes 6 for imparting. rotation to the feed material entering the separating chamber in which the discs 4 are located.
  • a slide-valve '7 is mounted in the bowl 1 for sliding movements axially of the bowl, the slide-valve surrounding the central nave 1a of the bowl.
  • the axial sliding movements of the valve 7 may be effected hydraulically by any of the arrangements disclosed in said Bjornstjerna Patent No. 2,178,547.
  • the bowl spindle 15 has an axial passage 16 for feeding hydraulic liquid to the space 17 between valve 7 and the bottom of bowl 1, and the space 17 has peripheral outlets 18 which discharge the hydraulic fluid at a lower rate than it is fed through passage 16.
  • valve 7 when the space 17 is completely filled with hydraulic fluid, the valve 7 is held in its raised position as illustrated, but when the feed through passage 16 is interrupted, the liquid drains from space 17 through outlets 18, whereby the liquid pressure in the separating chamber of the bowl forces valve 7 to its lower position. Upon resumption of the feed through passage 16, hydraulic liquid again accumulates in space 17 and lifts valve 7 to its raised position.
  • valve 7 has an annular, radiallyex-tending, sealing flange 8 which, by coaction with a sealing ring 9 secured in the bowl cover 2, serves to open and close sludge discharge openings 10 spaced along the peripheral wall of bowl 1.
  • the upper surface of slide-valve 7 is covered by a liner 11 of erosion-resistant material, such as sheet metal or plastic reinforced with fiber-glass.
  • the liner 11 At its outer edge, the liner 11 has a radially-directed flange 12 covering the flange or sealing surface 8 of the slide-valve 7.
  • the liner 11 has a shape conforming to the annular concave shape of the upper surface of slide-valve 7.
  • the circular inner edge of liner 1]; is provided with a flange 13 extending radially inward and seated on a step of valve 7, to which it is secured by relasable means in the form of a clamping ring or nut 14 screwed on the central up per portion of valve 7.
  • a rotatable centrifugal bowl of the type having a separating chamber provided at its outer periphery with an outlet for discharge of separated sludge, the outer portion of said chamber forming an annular sludge accumulating zone, the combination of a slide-valve movable in the bowl axially thereof in opposite directions and having a surface extending inwardly from said periphery toward the rotation axis of the bowl, the slide-valve also having an outer flange adjacent said outlet and forming a sealing surface operable to open and close said outlet upon sliding of the valve in opposite directions, a central distributor in the bowl for distributing feed material to said chamber and having a hollow lower portion overlying said inwardly extending surface of the valve, a
  • detachable liner on the slide-valve partially defining the tributor and defining with said distributor a feed passag and releasable means carried by the valve and engaging said inner portion of the liner for securing the liner to said valve surface.

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  • Centrifugal Separators (AREA)

Description

Feb. 26, 1963 H. w. THYLEFORS SELF-OPENING SLUDGE CENTRIFUGE Filed May 11, 1959 RM mwv my.
M 1, W. m mw ya f 3,079,069 SEL @PENING SLUDGE CENTRIEUGE Henrie Wilhelm Thyiefors, Stockholm, Sweden, assignor to Akiieholaget Separator, Stockholm, Sweden, a corporation of Sweden Filed May 11, 1959, See. No. 812,272 (Ilaians priority, application Sweden May 16, 1958 1 Claim. (Cl. 233-420) The present invention relates to centrifugal separators f the type having a controllable sludge discharge system, and more particularly to such separators in which the rotating bowl has a slide-valve movable axially of the bowl so as to alternately cover and uncover sludge discharge openings in the peripheral portion of the bowl.
Centrifuges of this type are well known in the art, as shown, for example, in Bjornstjerna Patent No. 2,178,547, dated November 7, 1939.
In centrifuges of this type, it is customary to organize the parts so that an annular sealing flange of the controllable slide-valve member disengages an 'O-ring seal to permit discharge of sludge through the bowl periphery. Under that arrangement, repeated discharge of sludge particles causes erosion of the '0-ring seal as well as of the sealing flange of the slide-valve. Erosion of the ring seal is no major problem, since it is readily replaceable; but erosion of the slide-valve flange is a serious problem due to the necessity of re-facin-g it from time to time, which is expensive and involves lost of productivity of the centrifuge while the re-facing is being effected.
It has been attempted to overcome this objection by installing on the flange of the slide-valve a packing ring which can be replaced as necessary without disassembiing the machine. With this arrangement, however, sludge is occasionally forced into the space between the slide-valve flange and its replaceable packing ring, causing an imperfect sealing when the sludge discharge is supposed to be cut off. Also, continued operation of this type of sealing arrangement causes erosion of the heads of the screws securing the packing ring to the slide-valve, thus making replacement difficult if not impossible.
The principal object of my invention is to provide a centrifuge of the type described which overcomes the above-noted difliculties.
According to the invention, the slide-valveis provided within the bowl with a detachable liner which serves as protection against erosion; and this liner, in turn, is provided with a generally radially directed outer sealing flange covering what would otherwise be the sealing surface of the slide-valve flange. The liner is preferably secured to the slide-valve by releasable means located radially inward from the outer sealing flange of the liner, that is, at an inner region where the effect of erosion from sludge is substantially reduced or non-existent. With this arrangement, those surfaces of the slide-valve which are most subject to erosion (the surface near the bowl periphery) are protected by the liner against erosion. Also, by extending the liner to the central portion of the slide-valve (at the region of the bowl axis), as in the preferred construction, not only is the slidevalve entirely protected from erosion but it is impossible for sludge to become lodged between the slide-valve and its liner. The liner can be readily replaced without any considerable interruption of the centrifuge operation, and the replacement cost is a small fraction of the cost of re-facing the slide-valve or replacing it.
For a better understanding of the invention, reference may be had to the accompanying drawing, in which the single illustration is a vertical sectional view of part of a centrifuge bowl embodying a preferred form of my invention.
3,?,@ Patented Feb. 25, 1963 In the drawing, the centrifugal bowl 1 is adapted for rotation about its central vertical axis A. The bowl cover 2 is locked to the bowl by means of a locking ring 3. A set of conical discs, indicated at 4, rests on a distributor 5 forming a central feed passage 5:2. for the material to be separated. On its lower surface, the distributor 5 carries radial impeller vanes 6 for imparting. rotation to the feed material entering the separating chamber in which the discs 4 are located.
A slide-valve '7 is mounted in the bowl 1 for sliding movements axially of the bowl, the slide-valve surrounding the central nave 1a of the bowl. The axial sliding movements of the valve 7 may be effected hydraulically by any of the arrangements disclosed in said Bjornstjerna Patent No. 2,178,547. As shown, the bowl spindle 15 has an axial passage 16 for feeding hydraulic liquid to the space 17 between valve 7 and the bottom of bowl 1, and the space 17 has peripheral outlets 18 which discharge the hydraulic fluid at a lower rate than it is fed through passage 16. Thus, when the space 17 is completely filled with hydraulic fluid, the valve 7 is held in its raised position as illustrated, but when the feed through passage 16 is interrupted, the liquid drains from space 17 through outlets 18, whereby the liquid pressure in the separating chamber of the bowl forces valve 7 to its lower position. Upon resumption of the feed through passage 16, hydraulic liquid again accumulates in space 17 and lifts valve 7 to its raised position.
At its outer portion, valve 7 has an annular, radiallyex-tending, sealing flange 8 which, by coaction with a sealing ring 9 secured in the bowl cover 2, serves to open and close sludge discharge openings 10 spaced along the peripheral wall of bowl 1.
The upper surface of slide-valve 7 is covered by a liner 11 of erosion-resistant material, such as sheet metal or plastic reinforced with fiber-glass. At its outer edge, the liner 11 has a radially-directed flange 12 covering the flange or sealing surface 8 of the slide-valve 7. The liner 11 has a shape conforming to the annular concave shape of the upper surface of slide-valve 7. The circular inner edge of liner 1]; is provided with a flange 13 extending radially inward and seated on a step of valve 7, to which it is secured by relasable means in the form of a clamping ring or nut 14 screwed on the central up per portion of valve 7.
It will be understood that when the slide-valve 7 is in its raised position, the outer flange 12 of the liner is pressed against the sealing ring 9 to effect tight closure of sludge outlets 11 Upon downward movement of valve 7 to open these outlets, the liner flange 12 eflectively protects the sealing flange 8 of the slide-valve from erosion by the sludge discharging through outlets do. The central clamping nut 14 permits ready replacement of the liner 11 and is located at a region where erosive action by the sludge is at a minimum.
I claim:
In a rotatable centrifugal bowl of the type having a separating chamber provided at its outer periphery with an outlet for discharge of separated sludge, the outer portion of said chamber forming an annular sludge accumulating zone, the combination of a slide-valve movable in the bowl axially thereof in opposite directions and having a surface extending inwardly from said periphery toward the rotation axis of the bowl, the slide-valve also having an outer flange adjacent said outlet and forming a sealing surface operable to open and close said outlet upon sliding of the valve in opposite directions, a central distributor in the bowl for distributing feed material to said chamber and having a hollow lower portion overlying said inwardly extending surface of the valve, a
detachable liner on the slide-valve partially defining the tributor and defining with said distributor a feed passag and releasable means carried by the valve and engaging said inner portion of the liner for securing the liner to said valve surface.
References (Iite'rl in the file of this patent UNITED STATES PATENTS 631,680 Staahlgren Aug. 22, 1-899 4 Gish Feb. 20, 1934 Nyrop Aug. 31, 1937 Bjornstjerna Nov. 7, 1939 Ortenblad Nov. 8, 1949 Harris Jan. 29, 1957 Krebs Q. Apr. 2, 1957 Steinacker Dec. 12, 1961 FOREIGN PATENTS Great Britain Apr. 2, 1948 Germany Nov. 18, 1935 France Aug. 23, 1950
US812272A 1958-05-16 1959-05-11 Self-opening sludge centrifuge Expired - Lifetime US3079069A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151072A (en) * 1960-06-21 1964-09-29 Braunschweigische Maschb Ansta Centrifugal apparatus
US3404833A (en) * 1966-08-20 1968-10-08 Buckau Wolf Maschf R Centrifuge
US3454226A (en) * 1965-03-26 1969-07-08 Niro Atomizer As Atomizer wheel for the atomization of suspensions of hard-wearing materials
US3741467A (en) * 1969-07-24 1973-06-26 Alfa Laval Ab Centrifugal separator
US3770190A (en) * 1971-02-25 1973-11-06 C Doyle Centrifugal countercurrent separator having bands covered with fluorocarbon sheets
US3823868A (en) * 1972-03-01 1974-07-16 M Baram Sludge ejecting centrifuge
USRE29083E (en) * 1965-03-26 1976-12-21 Aktieselskabet Niro Atomizer Atomizer wheel for the atomization of suspensions of hard-wearing materials
FR2405751A1 (en) * 1977-10-14 1979-05-11 Baram Martin ANNULAR SEAL FOR SELF-CLEANING SLUDGE CENTRIFUGE
US4636319A (en) * 1984-06-15 1987-01-13 Alfa-Laval Separation Ab Maintaining closing-liquid level in centrifuges, for operating slide valves
US20030146146A1 (en) * 2000-06-08 2003-08-07 Wilfried Mackel Centrifuge with a sieve system and method for operating the same

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US631680A (en) * 1898-07-09 1899-08-22 Karl Staahlgren Mineral-extracting machine.
US1947844A (en) * 1931-03-23 1934-02-20 Chase E Gish Bowl separator
DE622012C (en) * 1934-04-26 1935-11-18 Friedrich Kinscher Centrifugal drum with closing means moved by liquid pressure for the sludge outlet openings
US2091329A (en) * 1933-01-18 1937-08-31 Nyrop Aage Centrifugal separator
US2178547A (en) * 1936-06-26 1939-11-07 Laval Separator Co De Centrifugal separator
GB600239A (en) * 1946-05-17 1948-04-02 Harold William Fawcett Improvements in or relating to centrifugal separators
US2487364A (en) * 1943-04-22 1949-11-08 Superior Ab Automatically opening separator bowl
FR971978A (en) * 1940-11-28 1951-01-24 Bernard Moteurs Improvements made to centrifugal devices, particularly cream separators
US2779469A (en) * 1954-04-09 1957-01-29 Bruce G Harris Apparatus for recovering and cleaning the residual sand content from the tailings of gravel washing plants
US2787374A (en) * 1951-09-20 1957-04-02 Centriclone Corp Centrifugal classifier
US3012710A (en) * 1957-10-30 1961-12-12 Westfalia Separator Ag Centrifugal separator having lining of elastomer material

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US631680A (en) * 1898-07-09 1899-08-22 Karl Staahlgren Mineral-extracting machine.
US1947844A (en) * 1931-03-23 1934-02-20 Chase E Gish Bowl separator
US2091329A (en) * 1933-01-18 1937-08-31 Nyrop Aage Centrifugal separator
DE622012C (en) * 1934-04-26 1935-11-18 Friedrich Kinscher Centrifugal drum with closing means moved by liquid pressure for the sludge outlet openings
US2178547A (en) * 1936-06-26 1939-11-07 Laval Separator Co De Centrifugal separator
FR971978A (en) * 1940-11-28 1951-01-24 Bernard Moteurs Improvements made to centrifugal devices, particularly cream separators
US2487364A (en) * 1943-04-22 1949-11-08 Superior Ab Automatically opening separator bowl
GB600239A (en) * 1946-05-17 1948-04-02 Harold William Fawcett Improvements in or relating to centrifugal separators
US2787374A (en) * 1951-09-20 1957-04-02 Centriclone Corp Centrifugal classifier
US2779469A (en) * 1954-04-09 1957-01-29 Bruce G Harris Apparatus for recovering and cleaning the residual sand content from the tailings of gravel washing plants
US3012710A (en) * 1957-10-30 1961-12-12 Westfalia Separator Ag Centrifugal separator having lining of elastomer material

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151072A (en) * 1960-06-21 1964-09-29 Braunschweigische Maschb Ansta Centrifugal apparatus
USRE32064E (en) * 1965-03-26 1986-01-14 Aktieselskabet Niro Atomizer Atomizer wheel for the atomization of suspensions of hard-wearing materials
US3454226A (en) * 1965-03-26 1969-07-08 Niro Atomizer As Atomizer wheel for the atomization of suspensions of hard-wearing materials
USRE29083E (en) * 1965-03-26 1976-12-21 Aktieselskabet Niro Atomizer Atomizer wheel for the atomization of suspensions of hard-wearing materials
US3404833A (en) * 1966-08-20 1968-10-08 Buckau Wolf Maschf R Centrifuge
US3741467A (en) * 1969-07-24 1973-06-26 Alfa Laval Ab Centrifugal separator
US3770190A (en) * 1971-02-25 1973-11-06 C Doyle Centrifugal countercurrent separator having bands covered with fluorocarbon sheets
US3823868A (en) * 1972-03-01 1974-07-16 M Baram Sludge ejecting centrifuge
FR2405751A1 (en) * 1977-10-14 1979-05-11 Baram Martin ANNULAR SEAL FOR SELF-CLEANING SLUDGE CENTRIFUGE
US4211361A (en) * 1977-10-14 1980-07-08 Martin Baram Annular seal for self-cleaning sludge centrifuges
US4636319A (en) * 1984-06-15 1987-01-13 Alfa-Laval Separation Ab Maintaining closing-liquid level in centrifuges, for operating slide valves
US20030146146A1 (en) * 2000-06-08 2003-08-07 Wilfried Mackel Centrifuge with a sieve system and method for operating the same
US6969343B2 (en) * 2000-06-08 2005-11-29 Westfalia Separator Food Tec Gmbh Centrifuge with a sieve system and method for operating the same

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