EP0403757B1 - Use of a device for suspending graphite-containing solids - Google Patents

Use of a device for suspending graphite-containing solids Download PDF

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Publication number
EP0403757B1
EP0403757B1 EP90107350A EP90107350A EP0403757B1 EP 0403757 B1 EP0403757 B1 EP 0403757B1 EP 90107350 A EP90107350 A EP 90107350A EP 90107350 A EP90107350 A EP 90107350A EP 0403757 B1 EP0403757 B1 EP 0403757B1
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EP
European Patent Office
Prior art keywords
inlet
ring nozzle
carrier liquid
unit
annular nozzle
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
EP90107350A
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German (de)
French (fr)
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EP0403757A1 (en
Inventor
René Schmitter
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Lonza AG
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Lonza AG
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    • 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
    • B01F23/50—Mixing liquids with solids
    • B01F23/59—Mixing systems, i.e. flow charts or diagrams

Definitions

  • the invention relates to the use of a device with a cylindrical ring nozzle, in the upper part of which an inlet gap is provided, above which an inlet is arranged concentrically with respect to the cross section of the ring nozzle, and with a dispersion unit arranged downstream of the ring nozzle, to which an intensive mixer is connected, the Ring nozzle has a shape bent towards the dispersing unit.
  • a device for dispersing and dissolving polymer powders is known from EP-A-0 050 312.
  • This device has a straight, funnel-shaped ring nozzle, which is followed by a jet pump as a dispersing unit.
  • An inlet for the polymer powder and an inlet for carrier liquid are provided in the upper part of the ring nozzle.
  • the polymer powder entering through the central inlet hits the jet pump directly without being wetted by the carrier liquid beforehand.
  • the polymer powder and the carrier liquid are mixed and dissolved in a turbulent flow.
  • GB-A 1 493 462 describes a device for suspending substances which are swellable in water, such as e.g. Concrete, known, which has a funnel-shaped ring nozzle.
  • the inlet for the swellable substance is arranged above the funnel in the area of its circumference. For this reason, the substance is conveyed onto its wall in the upper section of the ring nozzle. This means that the substance touches the wall of the ring nozzle at a very slow speed.
  • the substance is not moistened at the point where it hits the funnel wall. Therefore, there is a risk that the ring nozzle clogs. This danger is increased by the fact that the cross section of the funnel decreases in the direction of its bend.
  • the suspension is not post-treated.
  • the invention has for its object to find a structurally simple device with which graphite-containing solid lubricants and a carrier liquid Mix to a homogeneous solid lubricant suspension.
  • the stability of the dispersion can be guaranteed over a longer period of time by the intensive mixer connected downstream of the dispersion unit.
  • Solid lubricants As a solid lubricant, those are used that to a significant extent contain graphite. Solid lubricants of this type are known, for example, from CH-PS 596 294 and CH-PS 609 728.
  • the suspension unit shown in FIG. 1 has a solid lubricant supply 1, a delivery device 2, an annular nozzle 3, a dispersing unit 4, an intensive mixer 6 and an agitator 7.
  • an inlet 8 for the solid lubricant At the upper part of the ring nozzle 3 is an inlet 8 for the solid lubricant and an inlet gap 9 for the carrier liquid arranged.
  • the inlet 8 for the solid lubricant is located above the inlet gap 9 for the carrier liquid.
  • the inlet gap for the carrier liquid 9 is provided to be adjustable. The amount and the film thickness of the carrier liquid film flowing along the walls of the ring nozzle 3 can thus be influenced.
  • the inlet for the solid lubricant 8 is via a suitable conveyor 2, e.g. a screw conveyor, fed from a storage container 1.
  • a suitable conveyor e.g. a screw conveyor
  • dispersing device 4 Commercially available devices which are able to exert a high shear force on the solid suspension can be used as the dispersing device 4.
  • an intensive mixer 6 which makes a further contribution to stabilizing the suspension.
  • a conveying device 5 e.g. Pump. This pump 5 is used to set the residence time of the suspension in the intensive mixer 6.
  • Suitable representatives of intensive mixers are e.g. Mixers with co-rotating or counter-rotating impeller shafts, agitator ball mills, jet mixers or screw mixers.
  • Another mixer 7 is connected downstream of the intensive mixer 6. This is equipped with a level control, which is able to switch the system on and off at the appropriate level.
  • the solid lubricant is fed via the conveyor 2 via the inlet 8 for the solid lubricant centrally into the upper part of the ring nozzle 3, falls down and is taken up by the carrier liquid film, which is formed by the inlet gap 9 for the carrier liquid, and then the Dispersing unit 4 supplied.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Lubricants (AREA)
  • Accessories For Mixers (AREA)

Description

Die Erfindung betrifft die Verwendung einer Vorrichtung mit einer zylindrischen Ringdüse, in deren oberen Teil ein Einlaßspalt vorgesehen ist, über dem ein Einlaß bezüglich des Querschnitts der Ringdüse konzentrisch angeordnet ist, und mit einer der Ringdüse nachgeordneten Dispergiereinheit, an die ein Intensivmischer anschließt, wobei die Ringdüse eine zur Dispergiereinheit hin gebogene Form hat.The invention relates to the use of a device with a cylindrical ring nozzle, in the upper part of which an inlet gap is provided, above which an inlet is arranged concentrically with respect to the cross section of the ring nozzle, and with a dispersion unit arranged downstream of the ring nozzle, to which an intensive mixer is connected, the Ring nozzle has a shape bent towards the dispersing unit.

Aus der EP-A 218 989 ist eine Vorrichtung zum Suspendieren von graphithaltigen Festschmierstoffen in einer Trägerflüssigkeit bekannt, bei der die Festschmierstoffe in einer Kolloidmühle und einem nachfolgenden Intensivmischer mit der Trägerflüssigkeit vermischt werden. Es hat sich jedoch bei dieser Vorrichtung herausgestellt, daß in den einzelnen Mischeinheiten, vor allen Dingen aber in der Kolloidmühle, Klumpenbildungen auftreten, so daß keine zufriedenstellende Suspension erreicht wird.From EP-A 218 989 a device for suspending graphite-containing solid lubricants in a carrier liquid is known, in which the solid lubricants are mixed with the carrier liquid in a colloid mill and a subsequent intensive mixer. With this device, however, it has been found that lumps form in the individual mixing units, but above all in the colloid mill, so that a satisfactory suspension is not achieved.

Aus der EP-A-0 050 312 ist eine Vorrichtung zum Dispergieren und Lösen von Polymerpulvern bekannt. Diese Vorrichtung weist eine gerade, trichterförmige Ringdüse auf, der als Dispergiereinheit eine Strahlpumpe nachgeordnet ist. Im oberen Teil der Ringdüse ist ein Einlaß für das Polymerpulver und ein Einlaß für Trägerflüssigkeit vorgesehen. Das durch den zentralen Einlaß eintretende Polymerpulver trifft direkt in der Strahlpumpe auf, ohne vorher von der Trägerflüssigkeit benetzt zu werden. In der Strahlpumpe werden das Polymerpulver und die Trägerflüssigkeit in einer turbulenten Strömung vermischt und aufgelöst.A device for dispersing and dissolving polymer powders is known from EP-A-0 050 312. This device has a straight, funnel-shaped ring nozzle, which is followed by a jet pump as a dispersing unit. An inlet for the polymer powder and an inlet for carrier liquid are provided in the upper part of the ring nozzle. The polymer powder entering through the central inlet hits the jet pump directly without being wetted by the carrier liquid beforehand. In In the jet pump, the polymer powder and the carrier liquid are mixed and dissolved in a turbulent flow.

Hierdurch wird erreicht, daß geringe Schwerkräfte auf die Polymerdispersion übertragen werden, und somit das scherempfindliche, hochmolekulare Polymerpulver schonend in Lösung gebracht wird.This ensures that low gravity is transferred to the polymer dispersion, and thus the shear-sensitive, high molecular weight polymer powder is gently brought into solution.

Diese Vorrichtung ist jedoch für eine Suspension von graphithaltigen Festschmierstoffen mit einer Trägerflüssigkeit ungeeignet, da für eine Suspension von graphithaltigen Festschmierstoffen hohe Scherkräfte erforderlich sind.However, this device is unsuitable for a suspension of graphite-containing solid lubricants with a carrier liquid, since high shear forces are required for a suspension of graphite-containing solid lubricants.

Aus der GB-A 1 493 462 ist eine Vorrichtung zur Suspensierung in Wasser quellbarer Substanzen, wie z.B. Betonit, bekannt, die eine trichterförmige Ringdüse aufweist. Der Einlaß für die quellbare Substanz ist oberhalb des Trichters im Bereich seines Umfangs angeordnet. Aus diesem Grund wird die Substanz im oberen Abschnitt der Ringdüse auf ihre Wand befördert. Dies bedeutet, daß die Substanz die Wand der Ringdüse mit einer sehr geringen Geschwindigkeit berührt. Außerdem wird die Substanz an der Stelle, an der er auf die Wand des Trichters auftrifft, nicht befeuchtet. Deswegen besteht die Gefahr, daß die Ringdüse verstopft. Diese Gefahr wird dadurch erhöht, daß sich der Querschnitt des Trichters in Richtung seiner Biegung verringert. Eine Nachbehandlung der Suspension erfolgt nicht.GB-A 1 493 462 describes a device for suspending substances which are swellable in water, such as e.g. Concrete, known, which has a funnel-shaped ring nozzle. The inlet for the swellable substance is arranged above the funnel in the area of its circumference. For this reason, the substance is conveyed onto its wall in the upper section of the ring nozzle. This means that the substance touches the wall of the ring nozzle at a very slow speed. In addition, the substance is not moistened at the point where it hits the funnel wall. Therefore, there is a risk that the ring nozzle clogs. This danger is increased by the fact that the cross section of the funnel decreases in the direction of its bend. The suspension is not post-treated.

Der Erfindung liegt die Aufgabe zugrunde, eine konstruktiv einfache Vorrichtung zu finden, mit der sich graphithaltige Festschmierstoffe und eine Trägerflüssigkeit zu einer homogenen Festschmierstoffsuspension vermischen lassen.The invention has for its object to find a structurally simple device with which graphite-containing solid lubricants and a carrier liquid Mix to a homogeneous solid lubricant suspension.

Diese Aufgabe wird ausgehend von dem gattungsgemäßen Stand der Technik durch die Verwendung einer Vorrichtung gelöst, wie sie in Patentanspruch 1 beschrieben ist. Vorteilhafterweise werden die in den Patentansprüche 2 bis 4 aufgeführten Vorrichtungen verwendet .This object is achieved on the basis of the generic prior art by using a device as described in claim 1. The devices listed in claims 2 to 4 are advantageously used.

Die durch den Einlaßspalt eingeführte Trägerflüssigkeit läuft an der Innenwand der Ringdüse entlang. Da die Ringdüse eine zu der Dispergiereinheit hin gebogene Form hat, trifft der zentral in die Ringdüse eingeführte graphithaltige Festschmierstoff zunächst im Bereich der Biegung auf die Innenwand der Ringdüse auf, bevor er in die Dispergiereinheit eingeführt wird. Der Festschmierstoff wird daher vor seinem Eintritt in die Dipsergiereinheit in der Trägerflüssigkeit aufgenommen und benetzt. Diese Benetzung des Festschmierstoffs mit der Trägerflüssigkeit ist wichtig, da hierdurch in der Dispergiereinheit hohe Scherkräfte auf die zu dispergierenden Komponenten einwirken.The carrier liquid introduced through the inlet gap runs along the inner wall of the ring nozzle. Since the ring nozzle has a shape bent toward the dispersing unit, the graphite-containing solid lubricant introduced centrally into the ring nozzle first hits the inner wall of the ring nozzle in the region of the bend before it is introduced into the dispersing unit. The solid lubricant is therefore absorbed and wetted in the carrier liquid before it enters the dipserging unit. This wetting of the solid lubricant with the carrier liquid is important because it causes high shear forces on the components to be dispersed in the dispersion unit.

Durch den die Dispergiereinheit nachgeschalteten Intensivmischer kann die Stabilität der Dispersion über einen längeren Zeitraum garantiert werden.The stability of the dispersion can be guaranteed over a longer period of time by the intensive mixer connected downstream of the dispersion unit.

Als Festschmierstoff werden solche eingesetzt, die zu einem wesentlichen Anteil Graphit enthalten. Solche Festschmierstoffe sind z.B. aus der CH-PS 596 294 und der CH-PS 609 728 bekannt.As a solid lubricant, those are used that to a significant extent contain graphite. Solid lubricants of this type are known, for example, from CH-PS 596 294 and CH-PS 609 728.

Als Trägerflüssigkeit wird zweckmäßig Wasser eingesetzt, dem gegebenenfalls geeignete Zusätze, wie z.B. Netzmittel, zugesetzt werden.Water is suitably used as the carrier liquid, to which suitable additives such as e.g. Wetting agents can be added.

Die mit der erfindungsgemäßen Vorrichtung nach dem erfindungsgemäßen Verfahren hergestellten Schmierstoffsuspensionen werden hauptsächlich bei der spanlosen Warmumformung von Metallen (hot metal forming) zum Schmieren der zwischen 50 bis 300°C heißen Werkzeuge, wie z.B. Dorne, Dornstangen, Walzen und/oder 800 bis 1200°C heißen Werkstücke, wie z.B. Rohre, Luppen, Bleche, eingesetzt.The lubricant suspensions produced with the device according to the invention by the method according to the invention are mainly used in the chipless hot forming of metals (hot metal forming) for the lubrication of tools heated between 50 and 300 ° C, e.g. Mandrels, mandrel bars, rollers and / or 800 to 1200 ° C hot workpieces, such as Pipes, slugs, sheets, used.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand von Zeichnungen näher erläutert. Es zeigt

Fig. 1
schematisch eine Suspendiereinheit, und
Fig. 2
schematisch eine Ringdüse.
An embodiment of the invention is explained below with reference to drawings. It shows
Fig. 1
schematically a suspension unit, and
Fig. 2
schematically a ring nozzle.

Die in Fig. 1 gezeigte Suspendiereinheit, weist eine Festschmierstoffvorlage 1, eine Fördereinrichtung 2, eine Ringdüse 3, eine Dispergiereinheit 4, einen Intensivmischer 6 und ein Rührwerk 7 auf.The suspension unit shown in FIG. 1 has a solid lubricant supply 1, a delivery device 2, an annular nozzle 3, a dispersing unit 4, an intensive mixer 6 and an agitator 7.

Die erfindungsgemäße Vorrichtung zum Suspendieren von graphithaltigen Festschmierstoffen besteht im wesentlichen aus der Ringdüse 3 und der nachgeschalteten Dispergiereinheit 4. Die Ringdüse 3 ist zylindrisch in Form eines gegen die Dispergiereinheit 4 gebogenen Rohres ausgebildet.The device according to the invention for suspending graphite-containing solid lubricants essentially consists of the ring nozzle 3 and the downstream dispersing unit 4. The ring nozzle 3 is cylindrical in the form of a tube bent against the dispersing unit 4.

Am oberen Teil der Ringdüse 3 ist ein Einlaß 8 für den Festschmierstoff sowie ein Einlaßspalt 9 für die Trägerflüssigkeit angeordnet. Der Einlaß 8 für den Festschmierstoff ist über dem Einlaßspalt 9 für die Trägerflüssigkeit angebracht.At the upper part of the ring nozzle 3 is an inlet 8 for the solid lubricant and an inlet gap 9 for the carrier liquid arranged. The inlet 8 for the solid lubricant is located above the inlet gap 9 for the carrier liquid.

Die Mündung des Einlasses 8 für den Festschmierstoff ist in der Rohrmitte zentriert, damit der Festschmierstoff zunächst ohne Berührung der Wände der Ringdüse 3 eingetragen werden kann.The mouth of the inlet 8 for the solid lubricant is centered in the middle of the tube, so that the solid lubricant can first be introduced without touching the walls of the ring nozzle 3.

Der Einlaßspalt für die Trägerflüssigkeit 9 ist verstellbar vorgesehen. Die Menge und die Filmdicke des an den Wänden der Ringdüse 3 entlang fließenden Trägerflüssigkeitfilms kann somit beeinflußt werden.The inlet gap for the carrier liquid 9 is provided to be adjustable. The amount and the film thickness of the carrier liquid film flowing along the walls of the ring nozzle 3 can thus be influenced.

Der Einlaß für den Festschmierstoff 8 wird über eine geeignete Fördereinrichtung 2, z.B. einer Förderschnecke, aus einem Vorratsbehälter 1 gespeist.The inlet for the solid lubricant 8 is via a suitable conveyor 2, e.g. a screw conveyor, fed from a storage container 1.

Als Dispergiereinrichtung 4 sind handelsübliche Einrichtungen, die eine hohe Scherkraft auf die Feststoffsuspension auszuüben in der Lage sind, einsetzbar.Commercially available devices which are able to exert a high shear force on the solid suspension can be used as the dispersing device 4.

Unmittelbar nach der Dispergiereinheit 4 ist ein Intensivmischer 6 nachgeschaltet, der einen weiteren Beitrag zur Stabilisierung der Suspension leistet. Zwischen Dispergiereinheit 4 und Intensivmischer 6 kann zusätzlich eine Fördereinrichtung 5, z.B. Pumpe, eingebaut werden. Mit dieser Pumpe 5 wird die Verweilzeit der Suspension im Intensivmischer 6 eingestellt. Geeignete Vertreter von Intensivmischern sind z.B. Mischer mit gleich- oder gegenläufigen Rührflügelwellen, Rührwerkkugelmühlen, Leitstrahlmischer oder Schneckenmischer.Immediately after the dispersing unit 4 is an intensive mixer 6, which makes a further contribution to stabilizing the suspension. Between the dispersion unit 4 and the intensive mixer 6, a conveying device 5, e.g. Pump. This pump 5 is used to set the residence time of the suspension in the intensive mixer 6. Suitable representatives of intensive mixers are e.g. Mixers with co-rotating or counter-rotating impeller shafts, agitator ball mills, jet mixers or screw mixers.

Dem Intensivmischer 6 ist ein weiteres Rührwerk 7 nachgeschaltet. Dieses ist mit einer Füllstandsregelung versehen, die in der Lage ist, bei entsprechendem Füllstand die Anlage ein- bzw. auszuschalten.Another mixer 7 is connected downstream of the intensive mixer 6. This is equipped with a level control, which is able to switch the system on and off at the appropriate level.

Zur Bildung der Suspension wird der Festschmierstoff über die Fördereinrichtung 2 über den Einlaß 8 für den Festschmierstoff zentral in den oberen Teil der Ringdüse 3 geführt, fällt herunter und wird vom Trägerflüssigkeitsfilm, der durch den Einlaßspalt 9 für die Trägerflüssigkeit gebildet wird, aufgenommen und dann der Dispergiereinheit 4 zugeführt.To form the suspension, the solid lubricant is fed via the conveyor 2 via the inlet 8 for the solid lubricant centrally into the upper part of the ring nozzle 3, falls down and is taken up by the carrier liquid film, which is formed by the inlet gap 9 for the carrier liquid, and then the Dispersing unit 4 supplied.

Claims (4)

  1. Use of a device
    - with a cylindrical annular nozzle (3), in whose upper part an inlet gap (9) is provided, above which an inlet (8) is arranged concentrically with respect to the cross-section of the annular nozzle (3), and
    - with a dispersing unit (4) arranged downstream of the annular nozzle (3), to which unit an intensive mixer (6) is connected, the annular nozzle (3) having a shape which is curved in the direction of the dispersing unit (4),
    for suspending solid lubricants containing graphite in a carrier fluid, the inlet gap (9) serving to introduce the carrier fluid and the inlet (8) serving to introduce the solid lubricant.
  2. Use according to Claim 1, the inlet gap (9) being designed to be adjustable.
  3. Use according to Claim 1 or 2, the inlet (8) being supplied from a storage container (1) via a conveyor device (2).
  4. Use according to one of the preceding Claims, an agitator (7) being arranged downstream of the intensive mixer (6).
EP90107350A 1989-06-16 1990-04-18 Use of a device for suspending graphite-containing solids Expired - Lifetime EP0403757B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2262/89 1989-06-16
CH226289 1989-06-16

Publications (2)

Publication Number Publication Date
EP0403757A1 EP0403757A1 (en) 1990-12-27
EP0403757B1 true EP0403757B1 (en) 1995-06-28

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ID=4229662

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Application Number Title Priority Date Filing Date
EP90107350A Expired - Lifetime EP0403757B1 (en) 1989-06-16 1990-04-18 Use of a device for suspending graphite-containing solids

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EP (1) EP0403757B1 (en)
JP (1) JPH0332731A (en)
CN (1) CN1025416C (en)
AR (1) AR247114A1 (en)
AT (1) ATE124291T1 (en)
BR (1) BR9002851A (en)
CA (1) CA2017758A1 (en)
DE (1) DE59009317D1 (en)
ES (1) ES2073474T3 (en)
MX (1) MX171989B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101132641B1 (en) 2010-11-02 2012-04-02 서강대학교산학협력단 Micromixing apparatus for fluid

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2403053A1 (en) * 1974-01-23 1975-07-31 Supraton Auer & Zucker FACILITY FOR THE PRODUCTION OF A SUSPENSION FROM HIGH-SWELL FABRICS
DE2945361C2 (en) * 1979-11-09 1985-09-19 Maizena Gmbh, 2000 Hamburg Plant for the continuous production of starch milk
DE3039510A1 (en) * 1980-10-20 1982-06-03 Hoechst Ag, 6000 Frankfurt DEVICE AND METHOD FOR DISPERSING AND SOLVING POLYMER POWDERS
CH665847A5 (en) * 1985-10-02 1988-06-15 Lonza Ag METHOD FOR SUSPENDING SOLID LUBRICANTS.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101132641B1 (en) 2010-11-02 2012-04-02 서강대학교산학협력단 Micromixing apparatus for fluid

Also Published As

Publication number Publication date
AR247114A1 (en) 1994-11-30
CN1025416C (en) 1994-07-13
ATE124291T1 (en) 1995-07-15
JPH0332731A (en) 1991-02-13
CN1057594A (en) 1992-01-08
MX171989B (en) 1993-11-26
ES2073474T3 (en) 1995-08-16
EP0403757A1 (en) 1990-12-27
BR9002851A (en) 1991-08-20
CA2017758A1 (en) 1990-12-16
DE59009317D1 (en) 1995-08-03

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