US3372810A - Sieve centrifuge - Google Patents

Sieve centrifuge Download PDF

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Publication number
US3372810A
US3372810A US393533A US39353364A US3372810A US 3372810 A US3372810 A US 3372810A US 393533 A US393533 A US 393533A US 39353364 A US39353364 A US 39353364A US 3372810 A US3372810 A US 3372810A
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US
United States
Prior art keywords
feed screw
drum
sieve
centrifuge
washing
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
US393533A
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English (en)
Inventor
Kletschke Hans
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.)
Kalle GmbH and Co KG
Original Assignee
Kalle GmbH and Co KG
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 Kalle GmbH and Co KG filed Critical Kalle GmbH and Co KG
Application granted granted Critical
Publication of US3372810A publication Critical patent/US3372810A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/48—Washing granular, powdered or lumpy materials; Wet separating by mechanical classifiers
    • B03B5/56—Drum classifiers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B15/00—Other accessories for centrifuges
    • B04B15/12—Other accessories for centrifuges for drying or washing the separated solid particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering
    • B04B3/04—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering 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
    • B04B5/00—Other centrifuges
    • B04B5/12—Centrifuges in which rotors other than bowls generate centrifugal effects in stationary containers

Definitions

  • the present invention relates to a sieve centrifuge, for washing solid flowable material, including a rotatable cylindrical drum having sieve apertures in the curved periphery thereof and a relatively rotatable generally cylindrical feed screw mounted coaxially within the drum, the thread or threads of the feed screw being interrupted to provide at least one free annular space between the circumference of the feed screw and the drum, the feed screw having peripheral apertures through which wash liquid can be supplied from a passage within the screw to the annular space, and the arrangement being such that by relative rotation of the feed
  • the feed screw is interrupted to provide at least one free annular space between the feed screw and the drum, and openings are provided in the periphery of the feed screw so that, from a passage within the same, washing liquid can be supplied to the annular space.
  • the sieve drum is of conical shape in order, during operation of the centrifuge, to produce a thrust on the solid material in a direction from the narrower to the wider end of the sieve drum.
  • the axis of rotation of such a centrifuge is generally vertical, the narrow end of the drum, at which material is introduced, being uppermost.
  • Centrifuges of the foregoing type have the disadvantage that the washing liquid may be unevenly distributed so that the centrifuged material is not uniformly washed.
  • These centrifuges have, therefore, been modified in nu merous ways to remedy this shortcoming.
  • the washing liquor is introduced through nozzles located within the annular space, or baffles are provided to confine the washing liquid within such space. While these expedients improve the uniformity of the washing process, they have the disadvantage that the nozzles or baffles must have an accurately determined shape and must be mounted in a particular location on the feed screw to ensure that the washing liquor acts evenly on the material to be centrifuged.
  • the present invention provides a sieve centrifuge for washing solid flowable material, including a rotatable cylindrical drum having sieve apertures in the curved 3.
  • the centrifuge of the invention is of a simpler design than those heretofore known but still enables the centrifuged material to be washed completely evenly.
  • the feed screw sieve centrifuge of the invention has proved its value for centrifuging and washing both crystalline and fibrous materials. It is preferably adapted for use with its axis substantially horizontal which is of advantage since with such a device it is easier to observe and control the throughput of material centrifuged and the progress of the washing thereof.
  • the efficiency of the feed screw sieve centrifuge of the invention could not have been expected for a number of reasons. In the first place, the centrifuge disproves the previously held view that feed screw sieve centrifuges, in which grooves are machined into the screw flights, must be of a conical shape to ensure the transport of the centrifuged material. In the second place, it could not have been expected that the cylindrical shape of the sieve drum and of the feed screw would ensure the even action of the washing liquid without using any of the previously adopted measures.
  • the sieve centrifuge of the invention has the further advantage that it requires less washing liquor to achieve an equivalent washing effect. This constitutes a further and particularly valuable advance in the art.
  • the solid material discharged from the centrifuge contains less liquid than material obtained with known centrifuges, under comparable operating conditions.
  • the feed screw sieve centrifuge of the invention is easy to manufacture.
  • the openings for the washing liquor may merely be bores in the periphery of the feed screw, the openings advantageously being regularly distributed.
  • the single figure is a diagrammatic representation of a cylindrical feed screw sieve centrifuge, the upper portion of the drawing being a section taken on a radius of the centrifuge, and the lower portion of the drawing being a view in elevation, partly in section, showing the exterior of the feed screw.
  • the feed screw sieve centrifuge comprises a rotatable drum 1 having a cylindrical wall In with sieve apertures 1!). Inside the drum 1 there is provided a hollow cylindrical feed screw 2, rotatable relative to the drum 1, having a screw flight 2a, which flight may be formed from pieces of sheet metal attached to the core of the screw.
  • the screw flight is interrupted to provide the annular space 3, and adjacent the space 3 the openings 4 are provided in the feed screw 2.
  • the openings 4 connect a passage inside the feed screw with the space feed screw is hollow and borne in the axle bearing 9.
  • Said hollow spindle is used to convey the material to be centrifuged, in the direction of the arrow S, to the right-hand end of the feed screw whence it is deflected by means of a funnel-shaped baffle 8, attached to the interior wall of the feed screw, through the outlet openings 6, and is directed against the interior of the wall 1a.
  • the washing liquid is transported, in the direction of the arrow W, through an inlet 7 into the inside of the feed screw 2 and deflected by the funnel-shaped baffie 8a, which is attached to the interior wall of the feed screw, through the openings 4 and into the space 3.
  • the washing liquid is forced outwardly through the material which has collected in the space 3 so that it elutriates this material and is then discharged through the wall 1a of the sieve drum.
  • the feed screw rotates clockwise, viewed from the right-hand end thereof (as shown in the drawing).
  • the sieve drum 1, borne in the roller bearing 10, rotates in the same direction but at a slightly higher speed so that the relative movement between the feed screw 2 and the sieve drum 1 causes the material to travel from the right to the left.
  • the transport of the centrifuged material along the filter surface depends only upon the action of the feed screw and can be measured from the pitch of the feed screw flights and the difference between the rotational speeds of the screw flights and the sieve drum, respectively.
  • the dwell time of the centrifuged material in the separating zone 3 is generally only a fraction of a second. As a result of the interruptions in the screw flights, the dwell time in this zone is increased, in known manner. Inside the groove 3 a ring of centrifuged material builds up and the dwell time thereof can be increased depending upon the depth and width of the space 3, the pitch and number of flights of the feed screw, and the difference in speed between the drum 1 and the feed screw 2.
  • the type of product centrifuged also has a certain influence on the dwell time.
  • the dwell time in the machine may be, for example, up to about one minute.
  • a sieve centrifuge comprising a rotatable, horizontally mounted cylindrical drum having sieve apertures in the curved periphery thereof, a relatively rotatable feed screw coaXially mounted in the drum, the feed screw having a cylindrical core and at least one screw flight thereon, the flight being interrupted to provide one free annular space between the feed screw and the drum, an aperture at one end of the core for passing material to be washed from the interior of the core to the interior of the drum, a plurality of apertures in the core for passing washing fluid from the interior of the core to the free annular space, and bafile means in the core for separating a portion of the interior of the core in communication with the aperture for passing material to be washed from a portion of the interior of the drum in communication with the apertures for passing washing fluid.

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  • Centrifugal Separators (AREA)
US393533A 1963-09-03 1964-09-01 Sieve centrifuge Expired - Lifetime US3372810A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK0050717 1963-09-03

Publications (1)

Publication Number Publication Date
US3372810A true US3372810A (en) 1968-03-12

Family

ID=7225720

Family Applications (1)

Application Number Title Priority Date Filing Date
US393533A Expired - Lifetime US3372810A (en) 1963-09-03 1964-09-01 Sieve centrifuge

Country Status (9)

Country Link
US (1) US3372810A (pl)
AT (1) AT260802B (pl)
BE (1) BE652587A (pl)
CH (1) CH420992A (pl)
DK (1) DK119920B (pl)
GB (1) GB1045908A (pl)
LU (1) LU46861A1 (pl)
NL (1) NL6409768A (pl)
SE (1) SE309387B (pl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5030348A (en) * 1986-11-03 1991-07-09 Roto-Sieve Ab Arrangement for an inlet and outlet in a rotating drum sieve
US20030196459A1 (en) * 2000-07-28 2003-10-23 David Ions Laundry appliance
US20060021921A1 (en) * 2003-04-04 2006-02-02 Christian Frommann Apparatus for removing fine material from a liquid

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4806389A (en) * 1987-03-02 1989-02-21 Gte Laboratories Incorporated Method of treating a coated phosphor
CN113426585B (zh) * 2021-06-24 2022-12-23 烟台市大展纸业有限公司 一种离心式造纸副产物污液浆料回收设备及其使用方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US962052A (en) * 1909-05-01 1910-06-21 Fred H Roberts Continuous centrifugal machine.
US1804108A (en) * 1928-05-15 1931-05-05 Pardo Oscar Garcia Centrifugal separator
US2858942A (en) * 1954-05-21 1958-11-04 Union Carbide Corp Centrifugal separator
US2870912A (en) * 1954-08-11 1959-01-27 Guinard Soc Const Apparatus to separate the solid particles in a liquid solution and to dry said particles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US962052A (en) * 1909-05-01 1910-06-21 Fred H Roberts Continuous centrifugal machine.
US1804108A (en) * 1928-05-15 1931-05-05 Pardo Oscar Garcia Centrifugal separator
US2858942A (en) * 1954-05-21 1958-11-04 Union Carbide Corp Centrifugal separator
US2870912A (en) * 1954-08-11 1959-01-27 Guinard Soc Const Apparatus to separate the solid particles in a liquid solution and to dry said particles

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5030348A (en) * 1986-11-03 1991-07-09 Roto-Sieve Ab Arrangement for an inlet and outlet in a rotating drum sieve
US20030196459A1 (en) * 2000-07-28 2003-10-23 David Ions Laundry appliance
US7021089B2 (en) * 2000-07-28 2006-04-04 Dyson Limited Laundry appliance
US20060021921A1 (en) * 2003-04-04 2006-02-02 Christian Frommann Apparatus for removing fine material from a liquid
US7344637B2 (en) * 2003-04-04 2008-03-18 Hans Huber Ag Maschinen-Und Anlagenbau Apparatus for removing fine material from a liquid

Also Published As

Publication number Publication date
AT260802B (de) 1968-03-25
NL6409768A (pl) 1965-03-04
GB1045908A (en) 1966-10-19
BE652587A (pl) 1965-03-02
LU46861A1 (pl) 1966-03-01
CH420992A (de) 1966-09-15
SE309387B (pl) 1969-03-17
DK119920B (da) 1971-03-08

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