EP0220788B1 - Flüssigkeitsströmungsmischer - Google Patents

Flüssigkeitsströmungsmischer Download PDF

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Publication number
EP0220788B1
EP0220788B1 EP86202094A EP86202094A EP0220788B1 EP 0220788 B1 EP0220788 B1 EP 0220788B1 EP 86202094 A EP86202094 A EP 86202094A EP 86202094 A EP86202094 A EP 86202094A EP 0220788 B1 EP0220788 B1 EP 0220788B1
Authority
EP
European Patent Office
Prior art keywords
chamber
impeller
drive shaft
shaft
cylindrical
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
Application number
EP86202094A
Other languages
English (en)
French (fr)
Other versions
EP0220788A2 (de
EP0220788A3 (en
Inventor
Garry Hoyland
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.)
Water Research Centre
Original Assignee
Water Research Centre
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 Water Research Centre filed Critical Water Research Centre
Priority to AT86202094T priority Critical patent/ATE81031T1/de
Priority to EP86202094A priority patent/EP0220788B1/de
Priority to DE8686202094T priority patent/DE3586721D1/de
Publication of EP0220788A2 publication Critical patent/EP0220788A2/de
Publication of EP0220788A3 publication Critical patent/EP0220788A3/en
Application granted granted Critical
Publication of EP0220788B1 publication Critical patent/EP0220788B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/43—Mixing liquids with liquids; Emulsifying using driven stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1125—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis

Definitions

  • This invention relates to a liquid flow mixer.
  • US-A-4341476, FR-A-1488593 and DE-B-1093335 all disclose apparatus comprising a generally cylindrical chamber, having an inlet and an outlet, the chamber having one or more rotatable, plate-like impellers, rotatable about the axis of the chamber and means for driving the impellers in rotation.
  • the impellers extend generally axially of the chamber.
  • FR-A-1488593 describes apparatus for mixing two liquid flows which comprises a cylindrical chamber having at one end an outlet for the mixture, said chamber including at least one plate-like impeller mounted on a drive shaft and rotatable about the axis of chamber and means for driving the impeller(s) in rotation.
  • none of these documents describes an apparatus for mixing two liquid flows whereby the liquids are subjected to immediate and thorough mixing as they pass quickly through the apparatus.
  • apparatus for mixing two or more liquid flows which comprises a cylindrical chamber having at one end an outlet for the mixture, said chamber including at least one plate-like impeller mounted on a drive shaft and rotatable about the axis of chamber and means for driving the impeller(s) in rotation, said impeller(s) extending axially in the chamber (51) and radially outwardly of the drive shaft (54); characterised in that said chamber has one open end forming an outlet coaxial with said cylindrical chamber and has no axial inlet but at least two radial inlets in the cylindrical wall of the chamber, whereby at least two separate incoming liquids can enter the chamber simultaneously to impinge directly on said rotating impeller(s).
  • the liquid flows to be mixed enter the chamber substantially radially, and exit axially.
  • the apparatus is used for dewatering a solids suspension as described in EP-A-172649, the suspension is mixed with flocculant by passing both radially into the cylindrical chamber with the impellers rotating therein, the mixture exiting from the open end of the chamber.
  • the drive shaft is mounted substantially axially in the cylindrical chamber, and the or each impeller preferably extends longitudinally of the chamber and radially outwardly of the shaft to terminate close to the walls of the chamber.
  • the mixer comprises a cylindrical body 50 constituting a mixing chamber 51.
  • the chamber is open at one end 52 (the right-hand end as shown in Figure 1) to provide an axial exit for the mixed liquids.
  • the other end of chamber 51 is closed by a low clearance impeller back-plate 53.
  • Extending through back-plate 53 and axially into chamber 51 is a drive-shaft 54 on which is mounted a circular disc 90 and three plate-like impellers 55,56,57 each extending longitudinally of the chamber at 120° with respect to the other two (see Figure 2).
  • each impeller extends radially outwardly from the shaft 54, almost to the inner wall 58 of body 50.
  • Disc 90 at one end of the impellers (the left-hand end as viewed in Figure 1), protects the seal 63 from any debris that may be present in the suspension.
  • the drive shaft 54 is connected to a drive motor/gear box combination 60, passing through bearing assemblies 61,62 and a mechanical seal 63 on the back-plate 53.
  • a disc 64 is mounted coaxially on shaft 54, to throw leak fluid centrifugally outwardly through drainage holes 65.
  • Bearing assembly 61 includes a support member 70 conveniently mounted between two coaxially arranged cylindrical bodies 71,72 containing the bearing assembly 62, fling plate 64 and seal 63, as shown schematically in Figure 1.
  • first liquid inlet pipe 80 eg. for sewage sludge
  • liquid includes not only liquids per se but mixtures, eg. of liquids and solids.
  • two further liquid supply pipes 81,82 are shown (in practice, only one will normally be used). These could for example be used for flocculant or other dosant.
  • Pipe 81 passes through the wall of pipe 80 and both terminate level with inner wall 58 of body 50.
  • Pipe 82 is downstream of pipe 80 and is disposed radially of body 50, again terminating at inner wall 58 of body 50.
  • the appropriate diameter of inlet 80 is 200 mm and the maximum speed of drive shaft 54 is about 500 rpm.
  • suspension and flocculant (the latter in controlled quantity) are fed into chamber 51 whilst the impellers are rotated to cause mixing of the suspension and flocculant.
  • the mixture passes out of chamber 51 via end 52, for example to the filter plate press. It is preferred to add the flocculant to the suspension either as the latter enters the mixing chamber 51 or immediately thereafter.
  • the motor used in the mixer of Figures 1 and 2 can be an induction motor, a variable speed reluctance motor or a DC motor. Best results are obtained from the flocculant when the motor speed is changed during a pressing cycle in accordance with the flowrate and viscosity of the suspension, i.e. when the motor speed is turned to suit the particular flocculant/suspension mixture being treated.
  • the or each impeller is so designed as to create maximum mixing without the problem of fouling with debris such as fibres that may be present in the suspension.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Treatment Of Sludge (AREA)

Claims (7)

  1. Apparat zum Mischen von zwei oder mehr Flüssigkeitsströmen, bestehend aus einer zylindrischen Kammer (51), die an dem einen Ende (52) einen Auslaß für die Mischung hat, wobei die besagte Kammer (51) mindestens ein tellerähnliches Flügelrad (55,56,57) in sich schließt, das auf eine Antriebswelle (54) montiert ist und um die Achse der Kammer (51) gedreht werden kann, und Mittel (60) für den Drehantrieb des Flügelrades bzw. der Flügelräder (55,56,57), wobei das/die besagte(n) Flügelrad/-räder sich axial in die Kammer (51) und radial nach außen von der Antriebswelle (54) erstreck(t)en, dadurch gekennzeichnet, daß die besagte Kammer (51) ein offenes Ende (52) hat, das koaxial mit der besagten zylindrischen Kammer einen Auslaß bildet, und keinen axialen Einlaß hat, jedoch mindestens zwei radiale Einlässe (80,81,82) in der zylindrischen Wand der Kammer (51), wodurch mindestens zwei getrennte zuströmende Flüssigkeiten gleichzeitig in die Kammer (51) eintreten können, um direkt auf das/die besagte(n) Flügelrad/-räder (55,56,57) aufzutreffen.
  2. Apparat nach Anspruch 1, in welchem das oder jedes Flügelrad (55,56,57) sich radial von der Welle (54) nach außen erstreckt, um nahe der zylindrischen Wand (58) der Kammer (51) zu enden.
  3. Apparat nach Anspruch 2, in welchem bei Drehung der Welle (54) das bzw. jedes Flügelrad (55,56,57) im wesentlichen das gesamte Volumen der Kammer (51) durchläuft.
  4. Apparat nach Anspruch 2 oder 3, in welchem am anderen Ende der Kammer vom Auslaß (52) her die Kammer (51) im wesentlichen von einer Flügelrad-Rückplatte (53) geschlossen wird, durch welche die Antriebswelle (54) in die Kammer eintritt.
  5. Apparat nach Anspruch 4, in welchem die besagte Rückplatte (53) eine Dichtung (63) rund um die Antriebswelle in sich schließt.
  6. Apparat nach Anspruch 4 oder 5, in welchem eine kreisförmige Scheibe (90) radial auf die Antriebswelle (54) in dem an die Rückplatte (53) angrenzenden Zylinder (51) montiert ist.
  7. Apparat nach einem der vorstehenden Ansprüche, in welchem ein radialer Einlaß (81) innerhalb eines anderen (80) liegt.
EP86202094A 1985-07-15 1985-07-15 Flüssigkeitsströmungsmischer Expired EP0220788B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT86202094T ATE81031T1 (de) 1985-07-15 1985-07-15 Fluessigkeitsstroemungsmischer.
EP86202094A EP0220788B1 (de) 1985-07-15 1985-07-15 Flüssigkeitsströmungsmischer
DE8686202094T DE3586721D1 (de) 1985-07-15 1985-07-15 Fluessigkeitsstroemungsmischer.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86202094A EP0220788B1 (de) 1985-07-15 1985-07-15 Flüssigkeitsströmungsmischer

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP85305044.1 Division 1985-07-15
EP85305044A Division EP0172649A3 (de) 1984-07-26 1985-07-15 Entwässerung von Feststoffsuspensionen

Publications (3)

Publication Number Publication Date
EP0220788A2 EP0220788A2 (de) 1987-05-06
EP0220788A3 EP0220788A3 (en) 1989-04-26
EP0220788B1 true EP0220788B1 (de) 1992-09-30

Family

ID=8195826

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86202094A Expired EP0220788B1 (de) 1985-07-15 1985-07-15 Flüssigkeitsströmungsmischer

Country Status (3)

Country Link
EP (1) EP0220788B1 (de)
AT (1) ATE81031T1 (de)
DE (1) DE3586721D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6715623B2 (en) 2002-02-26 2004-04-06 Stone Container Corporation Collapsible display shelving

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE580037C (de) * 1933-07-05 Walther Reuther Vorrichtung zum Mischen von pulverfoermigem, fein- und grobkoernigem Gut
DE1093335B (de) * 1954-10-14 1960-11-24 Albert Theysohn Misch- und Knetvorrichtung fuer zaehplastische Massen
US3367126A (en) * 1966-05-19 1968-02-06 John D. Howell Floating agitator
FR1488593A (fr) * 1966-08-02 1967-07-13 Ici Ltd Appareillage pour procédés chimiques et physiques
CH584269A5 (de) * 1973-12-21 1977-01-31 Sandoz Ag
US4341476A (en) * 1977-06-03 1982-07-27 Sollich Kg Spezialmaschinenfabrik Apparatus for treating materials containing cocoa butter
FR2443872A1 (fr) * 1978-12-13 1980-07-11 Adler Sa Malaxeur, notamment pour la preparation d'une matiere composite

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6715623B2 (en) 2002-02-26 2004-04-06 Stone Container Corporation Collapsible display shelving

Also Published As

Publication number Publication date
ATE81031T1 (de) 1992-10-15
EP0220788A2 (de) 1987-05-06
DE3586721D1 (de) 1992-11-05
EP0220788A3 (en) 1989-04-26

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