EP0131120B1 - Method and apparatus for spraying suspensions very finely - Google Patents

Method and apparatus for spraying suspensions very finely Download PDF

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Publication number
EP0131120B1
EP0131120B1 EP84105700A EP84105700A EP0131120B1 EP 0131120 B1 EP0131120 B1 EP 0131120B1 EP 84105700 A EP84105700 A EP 84105700A EP 84105700 A EP84105700 A EP 84105700A EP 0131120 B1 EP0131120 B1 EP 0131120B1
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EP
European Patent Office
Prior art keywords
pressurised gas
nozzle opening
nozzle
liquid
suspension
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Expired
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EP84105700A
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German (de)
French (fr)
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EP0131120A1 (en
Inventor
René Egli
Hans-Rudolf Staub
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Lonza AG
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Lonza AG
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Priority to AT84105700T priority Critical patent/ATE25598T1/en
Publication of EP0131120A1 publication Critical patent/EP0131120A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/40—Filters located upstream of the spraying outlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/52—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles
    • B05B15/522—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles using cleaning elements penetrating the discharge openings
    • B05B15/5223—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles using cleaning elements penetrating the discharge openings the cleaning element, e.g. a needle, and the discharge opening being movable relative to each other in a direction substantially parallel to the flow of liquid or other fluent material through said opening
    • B05B15/5225—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles using cleaning elements penetrating the discharge openings the cleaning element, e.g. a needle, and the discharge opening being movable relative to each other in a direction substantially parallel to the flow of liquid or other fluent material through said opening the cleaning element being located upstream of the discharge opening or being actuated upstream therefrom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
    • B05B7/0441—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber
    • B05B7/0475—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber with means for deflecting the peripheral gas flow towards the central liquid flow

Definitions

  • the invention relates to a method and a device for the finest spraying of suspensions in finely divided form, as known from EP-A-0 039 839.
  • a device for spraying disperse systems comprising a spray head with a nozzle opening, an arranged inside the spray head, which can be pushed through the nozzle opening and optionally a between the inlet for the disperse system and the nozzle insert arranged with a scraper device for the sieve insert.
  • a nozzle opening with a minimum diameter of 0.3 mm and a minimum working pressure of 20 bar must be maintained. This means that a certain throughput cannot be undercut.
  • This also means that when spraying, the disperse systems are applied as relatively thick films. It was therefore proposed in European patent application 0 039 839 to spray the disperse system through an air atomizing nozzle.
  • An air atomizer nozzle enables a much better regulation of the spray quantity and is particularly suitable for evenly distributing the smallest quantities of material.
  • the polymers due to their film-forming properties, can adversely affect the effect of the air atomizing nozzle in continuous operation due to running deposits. While the liquid nozzle is pierced by a cleaning needle in the event of blockages, the film-forming polymers can gradually build up deposits and impair the air flow and finally interrupt it.
  • the object of the present invention is to avoid these disadvantages and to propose a method and a device which enables trouble-free continuous operation when spraying polymer-containing suspensions.
  • air is expediently used as the spray gas and water is expediently used as the liquid.
  • Air is generally used primarily for reasons of economy, but it is also possible to use other gases, such as nitrogen, CO 2 , halide hydrocarbon gases or noble gases, alone or in a mixture with one another or in a mixture with air instead of air.
  • gases such as nitrogen, CO 2 , halide hydrocarbon gases or noble gases, alone or in a mixture with one another or in a mixture with air instead of air.
  • water is also used as a liquid.
  • alcohols with 1 to 8 carbon atoms, glycols, glycol ethers or glycol ether esters can also be used as the liquid alone, in a mixture with one another or in a mixture with water.
  • the liquid can also contain fractions of organic, water-soluble oils or an emulsion of oil in water.
  • the liquid can be mixed into the gas in different ways. For example, there is the possibility of evaporating the liquid and having it taken up by the gas stream, or the liquid can be injected into the gas stream.
  • Devices for example metering pumps, pressure vessels with metering, vacuum metering devices, etc., are suitable for this.
  • the compressed gas must be saturated or supersaturated with liquid.
  • oversaturation does not only mean an oversaturated state, but in a broader sense, in particular also the mist, i.e. the liquid in the form of very fine droplets, in the compressed gas.
  • Figure 1 shows an axial section through a first embodiment of the invention.
  • a stamp 4 is arranged in the housing 1, which is equipped with an inlet 2 for the suspension and at the tip of which there is a nozzle opening 3 with a diameter of 1.0 to 4.0 mm.
  • the punch 4 is arranged to be movable in the longitudinal direction and is moved by the piston 5.
  • the piston is controlled pneumatically by the compressed gas connection 11 and 12.
  • a partial flow of the compressed gas forms the compressed gas supply 8 to the air atomizing nozzle.
  • the sieve insert 6 expediently has a cylindrical shape which encloses the side surfaces of the stamp.
  • the sieve insert 6 can be attached to the piston 5.
  • the stripping device 7 is expediently designed as a hollow cylinder which straddles the outer circumference of the sieve insert and is attached to the housing 1, or the stripping device can be embodied in a bushing in the housing 1. Sealing elements can prevent media from penetrating.
  • any entrained, undesirably large particles are retained on the sieve insert.
  • the saturated or supersaturated pressurized gas is pressed through a pressurized gas supply 8, which opens into the spray nozzle 3.
  • a pressurized gas supply 8 which opens into the spray nozzle 3.
  • the saturated or supersaturated compressed gas mixes with the suspension and the suspension is sprayed as a mist.
  • the piston 5 first moves the plunger 4 attached to it in the opening direction, i. H. the punch tip is withdrawn from the nozzle opening and clears the way for the suspension. If the piston is moved in the opposite direction, the punch tip pushes back into the nozzle opening, presses out any dirt and closes the hole nozzle opening.
  • the sieve insert 6 connected to the piston 5 is stripped off during the closing process, the sieve surface being cleaned. In the end position, the entire screen surface is covered by the liner 7 or the stripping device and closes the passage for the suspension. When the piston is withdrawn, the suspension passes through the sieve insert and any excessively large particles and impurities are retained.
  • FIG. 2 shows an axial section through a second expedient embodiment of the invention.
  • a capillary 14 with a diameter of 0.4 to 0.6 mm, preferably 0.5 mm, is arranged in the piston 5, with the capillary 14 and the compressed gas supply in a spray pause via the compressed gas connection 12 8 humidified compressed gas flows into the nozzle opening 3. It is thereby achieved that the compressed gas supply 8 is protected from the flowing back suspension and kept free. Drying of suspension residues is reliably prevented and cleaning of both the fine channels of the compressed gas supply 8 and the nozzle opening 3 is achieved.
  • the device described is used for spraying suspensions which contain, in particular, graphite as a dispersion, larger proportions of polymers, such as alkylene polymers, dispersion auxiliaries and stabilizers, and a liquid, generally water, as the dispersion medium.
  • polymers such as alkylene polymers, dispersion auxiliaries and stabilizers
  • a liquid generally water
  • Such formulations are described in DE-OS-24 50 716 as high-temperature lubricants. In order to be able to use these high-temperature lubricants in non-cutting metal forming, they must be applied to workpieces and / or tools in the most uniform layer and distribution possible.
  • the minimum pressure for the suspension can be reduced close to the ambient pressure, pressures from 0.01 to 15 bar are advantageous. expediently 0.1 to 0.5 bar.
  • the pressure of the gas must be somewhat higher than the pressure in the suspension in order to prevent the suspension from flowing back into the channels of the compressed gas supply 8.

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  • Nozzles (AREA)

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum feinsten Versprühen von Suspensionen in feinstteiliger Form, wie aus der EP-A-0 039 839 bekannt.The invention relates to a method and a device for the finest spraying of suspensions in finely divided form, as known from EP-A-0 039 839.

Aus der DE-OS-27 24 931 ist eine Vorrichtung zum Versprühen von dispersen Systemen, insbesondere Suspensionen, bekannt, enthaltend einen Sprühkopf mit einer Düsenöffnung, einem im Inneren des Sprühkopfes angeordneten, durch die Düsenöffnung schiebbaren Stempel und gegebenenfalls einem zwischen dem Einlass für das disperse System und der Düsenöffnung angeordneten Siebeinsatz mit Abstreifvorrichtung für den Siebeinsatz. Um mit dieser Vorrichtung zufriedenstellend arbeiten zu können und ein gleichmässiges Spritzbild zu erhalten, muss eine Düsenöffnung mit einem minimalen Durchmesser von 0,3 mm vorgesehen und ein minimaler Arbeitsdruck von 20 bar eingehalten werden. Das bedeutet, dass ein bestimmter Durchsatz nicht unterschritten werden kann. Das heisst auch, dass beim Versprühen die dispersen Systeme als relativ dicke Filme aufgetragen werden. Es wurde deshalb in der europäischen Patentanmeldung 0 039 839 vorgeschlagen, das disperse System durch eine Luftzerstäuberdüse zu versprühen. Eine Luftzerstäuberdüse ermöglicht eine wesentlich bessere Regulierung der Sprühmenge und ist besonders geeignet, kleinste Mengen Material gleichmässig zu verteilen.From DE-OS-27 24 931 a device for spraying disperse systems, in particular suspensions, is known, comprising a spray head with a nozzle opening, an arranged inside the spray head, which can be pushed through the nozzle opening and optionally a between the inlet for the disperse system and the nozzle insert arranged with a scraper device for the sieve insert. In order to work satisfactorily with this device and to obtain a uniform spray pattern, a nozzle opening with a minimum diameter of 0.3 mm and a minimum working pressure of 20 bar must be maintained. This means that a certain throughput cannot be undercut. This also means that when spraying, the disperse systems are applied as relatively thick films. It was therefore proposed in European patent application 0 039 839 to spray the disperse system through an air atomizing nozzle. An air atomizer nozzle enables a much better regulation of the spray quantity and is particularly suitable for evenly distributing the smallest quantities of material.

Beim Versprühen von Suspensionen, enthaltend Graphit als Dispersum, grössere Anteile von Polymeren, wie Alkylenpolymerisate, Dispersionsmittel und Stabilisatoren, suspendiert in der Regel in Wasser, durch eine Luftzerstäuberdüse besteht die Gefahr, dass insbesondere das Polymer zur Filmbildung und Verharzung neigt.When spraying suspensions containing graphite as a disperse, larger proportions of polymers such as alkylene polymers, dispersants and stabilizers, usually suspended in water, through an air atomizing nozzle there is a risk that the polymer in particular tends to form films and gum.

Derartige Suspensionen sind in der DE-OS-24-50717 als Hochtemperaturschmiermittel beschrieben.Such suspensions are described in DE-OS-24-50717 as high-temperature lubricants.

Es hat sich in der Praxis herausgestellt, dass die Polymere durch ihre filmbildenden Eigenschaften im Dauerbetrieb durch laufende Ablagerungen die Luftzerstäuberdüse in ihrer Wirkung zu beeinträchtigen vermögen. Während die Flüssigkeitsdüse bei Verstopfungen durch eine Reinigungsnadel durchstossen wird, vermögen die filmbildenden Polymere nach und nach Ablagerungen aufzubauen und den Luftstrom zu beeinträchtigen und schliesslich zu unterbrechen.It has been found in practice that the polymers, due to their film-forming properties, can adversely affect the effect of the air atomizing nozzle in continuous operation due to running deposits. While the liquid nozzle is pierced by a cleaning needle in the event of blockages, the film-forming polymers can gradually build up deposits and impair the air flow and finally interrupt it.

Aufgabe vorliegender Erfindung ist es, diese Nachteile zu vermeiden und ein Verfahren und eine Vorrichtung vorzuschlagen, die einen störungsfreien Dauerbetrieb beim Versprühen von polymerhaltigen Suspensionen ermöglicht.The object of the present invention is to avoid these disadvantages and to propose a method and a device which enables trouble-free continuous operation when spraying polymer-containing suspensions.

Erfindungsgemäss wird dies durch ein Verfahren nach Anspruch 1 und eine Vorrichtung nach Anspruch 6 erreicht.According to the invention, this is achieved by a method according to claim 1 and an apparatus according to claim 6.

Nach dem Verfahren der Erfindung wird als Sprühgas zweckmässig Luft und als Flüssigkeit zweckmässig Wasser angewendet.According to the method of the invention, air is expediently used as the spray gas and water is expediently used as the liquid.

Vor allem aus Gründen der Wirtschaftlichkeit wird in der Regel Luft angewendet, es ist aber auch möglich, statt Luft andere Gase, wie Stickstoff, C02, halogenide Kohlenwasserstoffgase oder Edelgase allein oder im Gemisch untereinander oder im Gemisch mit Luft einzusetzen.Air is generally used primarily for reasons of economy, but it is also possible to use other gases, such as nitrogen, CO 2 , halide hydrocarbon gases or noble gases, alone or in a mixture with one another or in a mixture with air instead of air.

Ebenso wird aus wirtschaftlichen Erwägungen Wasser als Flüssigkeit eingesetzt. Als Flüssigkeit können aber auch Alkohole mit 1 bis 8 C-Atomen, Glykole, Glykoläther oder Glykolätherester allein, im Gemisch untereinander oder in Mischung mit Wasser eingesetzt werden. Gegebenenfalls kann die Flüssigkeit auch Anteile von organischen, wasserlöslichen Oelen oder eine Emulsion von Oel in Wasser enthalten.For economic reasons, water is also used as a liquid. However, alcohols with 1 to 8 carbon atoms, glycols, glycol ethers or glycol ether esters can also be used as the liquid alone, in a mixture with one another or in a mixture with water. If appropriate, the liquid can also contain fractions of organic, water-soluble oils or an emulsion of oil in water.

Die Flüssigkeit kann auf verschiedene Arten dem Gas zugemischt werden. Beispielsweise besteht die Möglichkeit, die Flüssigkeit zu verdampfen und durch den Gasstrom aufnehmen zu lassen oder die Flüssigkeit kann in den Gasstrom eingespritzt werden.The liquid can be mixed into the gas in different ways. For example, there is the possibility of evaporating the liquid and having it taken up by the gas stream, or the liquid can be injected into the gas stream.

Dazu bieten sich Vorrichtungen, beispielsweise Dosierpumpen, Druckgefässe mit Dosierung, Unterdruckdosierer usw., an.Devices, for example metering pumps, pressure vessels with metering, vacuum metering devices, etc., are suitable for this.

Nach dem Verfahren der Erfindung muss das Druckgas mit Flüssigkeit gesättigt oder übersättigt sein. Damit sollen auch Sättigungsgrade mit eingeschlossen sein, die nur einer annähernden Sättigung entsprechen und wie sie beispielsweise durch Volumensänderung und Temperaturschwankungen im Druckgas vorkommen können. Im vorliegenden Fall versteht man unter Uebersättigung nicht allein einen übersättigten Zustand, sondern im weiteren Sinn .insbesondere auch den Nebel, also die Flüssigkeit in Form feinster Tröpfchen, im Druckgas.According to the method of the invention, the compressed gas must be saturated or supersaturated with liquid. This should also include degrees of saturation that only correspond to an approximate saturation and how they can occur, for example, due to volume changes and temperature fluctuations in the compressed gas. In the present case, oversaturation does not only mean an oversaturated state, but in a broader sense, in particular also the mist, i.e. the liquid in the form of very fine droplets, in the compressed gas.

Die Erfindung ist nachstehend anhand der Zeichnungen in beispielhafter Weise näher erläutert. Es zeigt Abbildung 1 einen Axialschnitt durch eine erste Ausführungsform.der Erfindung. Im Gehäuse 1, das mit einem Einlass 2 für die Suspension ausgestattet ist und an dessen Spitze sich eine Düsenöffnung 3 mit einem Durchmesser von 1,0 bis 4,0 mm befindet, ist ein Stempel 4 angeordnet. Der Stempel 4 ist in Längsrichtung beweglich angeordnet und wird durch den Kolben 5 bewegt. Beispielsweise erfolgt die Steuerung des Kolbens pneumatisch durch den Druckgasanschluss 11 und 12. Ein Teilstrom des Druckgases bildet die Druckgaszuführung 8 zu der Luftzerstäuberdüse.The invention is explained below with reference to the drawings in an exemplary manner. Figure 1 shows an axial section through a first embodiment of the invention. A stamp 4 is arranged in the housing 1, which is equipped with an inlet 2 for the suspension and at the tip of which there is a nozzle opening 3 with a diameter of 1.0 to 4.0 mm. The punch 4 is arranged to be movable in the longitudinal direction and is moved by the piston 5. For example, the piston is controlled pneumatically by the compressed gas connection 11 and 12. A partial flow of the compressed gas forms the compressed gas supply 8 to the air atomizing nozzle.

Der Siebeinsatz 6 weist zweckmässig eine zylindrische, die Seitenflächen des Stempels umschliessende Form auf. Der Siebeinsatz 6 kann am Kolben 5 befestigt sein. Die Abstreifvorrichtung 7 wird zweckmässig als ein den äusseren Umfang des Siebeinsatzes bestreichender Hohlzylinder gestaltet, der am Gehäuse 1 befestigt ist oder die Abstreifvorrichtung kann in einer Laufbuchse im Gehäuse 1 ausgebildet sein. Dichtelemente können ein Durchdringen der Medien verhindern.The sieve insert 6 expediently has a cylindrical shape which encloses the side surfaces of the stamp. The sieve insert 6 can be attached to the piston 5. The stripping device 7 is expediently designed as a hollow cylinder which straddles the outer circumference of the sieve insert and is attached to the housing 1, or the stripping device can be embodied in a bushing in the housing 1. Sealing elements can prevent media from penetrating.

Werden mit der erfindungsgemässen Vorrichtung Suspensionen versprüht, so werden allenfalls mitgerissene, unerwünscht grosse Partikel am Siebeinsatz zurückgehalten.If suspensions are sprayed with the device according to the invention, any entrained, undesirably large particles are retained on the sieve insert.

Durch eine Druckgaszuführung 8, die in die Sprühdüse 3 mündet, wird das gesättigte oder übersättigte Druckgas gepresst. Vor der Düsenöffnung vermischt sich das gesättigte oder übersättigte Druckgas mit der Suspension und die Suspension wird als Nebel versprüht.The saturated or supersaturated pressurized gas is pressed through a pressurized gas supply 8, which opens into the spray nozzle 3. In front of the nozzle opening, the saturated or supersaturated compressed gas mixes with the suspension and the suspension is sprayed as a mist.

Der Kolben 5 bewegt den daran befestigten Stempel 4 zuerst in Oeffnungsrichtung, d. h. die Stempelspitze wird aus der Düsenöffnung zurückgezogen und gibt-den Weg für die Suspension frei. Wird der Kolben in entgegengesetzter Richtung bewegt, stösst die Stempelspitze wieder in die Düsenöffnung, presst allfällige Verunreinigungen heraus und schliesst die Lochdüsenöffnung. Der mit dem Kolben 5 verbundene Siebeinsatz 6 wird beim Schliessvorgang abgestreift, wobei die Sieboberfläche gereinigt wird. In der Endposition ist die ganze Sieboberfläche durch die Laufbuchse 7 oder die Abstreifvorrichtung abgedeckt und schliesst den Durchgang für die Suspension. Bei zurückgezogenem Kolben passiert die Suspension den Siebeinsatz und allfällige zu grosse Partikel und Verunreinigungen werden zurückgehalten.The piston 5 first moves the plunger 4 attached to it in the opening direction, i. H. the punch tip is withdrawn from the nozzle opening and clears the way for the suspension. If the piston is moved in the opposite direction, the punch tip pushes back into the nozzle opening, presses out any dirt and closes the hole nozzle opening. The sieve insert 6 connected to the piston 5 is stripped off during the closing process, the sieve surface being cleaned. In the end position, the entire screen surface is covered by the liner 7 or the stripping device and closes the passage for the suspension. When the piston is withdrawn, the suspension passes through the sieve insert and any excessively large particles and impurities are retained.

Die Abbildung 2 zeigt einen Axialschnitt durch eine zweite zweckmässige Ausführungsform der Erfindung. In einer Vorrichtung nach Abbildung 2 ist im Kolben 5 eine Kapillare 14 mit einem Durchmesser von 0,4 bis 0,6 mm, vorzugsweise 0,5 mm, angeordnet, wobei in einer Sprühpause über den Druckgasanschluss 12 durch die Kapillare 14 und durch die Druckgaszuführung 8 befeuchtetes Druckgas in die Düsenöffnung 3 strömt. Dadurch wird erreicht, dass die Druckgaszuführung 8 vor zurückfliessender Suspension geschützt und freigehalten wird. Ein Antrocknen von Suspensionsresten wird zuverlässig verhindert und man erreicht eine Reinigung sowohl der feinen Kanäle der Druckgaszuführung 8 als auch der Düsenöffnung 3.Figure 2 shows an axial section through a second expedient embodiment of the invention. In a device according to Figure 2, a capillary 14 with a diameter of 0.4 to 0.6 mm, preferably 0.5 mm, is arranged in the piston 5, with the capillary 14 and the compressed gas supply in a spray pause via the compressed gas connection 12 8 humidified compressed gas flows into the nozzle opening 3. It is thereby achieved that the compressed gas supply 8 is protected from the flowing back suspension and kept free. Drying of suspension residues is reliably prevented and cleaning of both the fine channels of the compressed gas supply 8 and the nozzle opening 3 is achieved.

Selbstverständlich können die Vorrichtungen auch ohne Siebeinsatz betrieben werden, damit fällt aber auch dessen reinigende Wirkung weg. Weitere Varianten von Sprühvorrichtungen sind aus der EP-PS-0 039 839 bekannt.Of course, the devices can also be operated without a sieve insert, but this also removes its cleaning effect. Further variants of spray devices are known from EP-PS-0 039 839.

Die beschriebene Vorrichtung wird zum Versprühen von Suspensionen verwendet, die insbesondere Graphit als Dispersum, grössere Anteile an Polymeren, wie Alkylenpolymerisate, Dispersionshilfsmittel und Stabilisatoren, sowie einer Flüssigkeit, in der Regel Wasser, als Dispersionsmittel enthalten. Solche Formulationen sind in der DE-OS-24 50 716 als Hochtemperaturschmiermittel beschrieben. Um diese Hochtemperaturschmiermittel bei der spanlosen Metallumformung anwenden zu können, müssen sie in möglichst gleichmässiger Schicht und Verteilung auf Werkstücke und/oder Werkzeug aufgetragen werden können.The device described is used for spraying suspensions which contain, in particular, graphite as a dispersion, larger proportions of polymers, such as alkylene polymers, dispersion auxiliaries and stabilizers, and a liquid, generally water, as the dispersion medium. Such formulations are described in DE-OS-24 50 716 as high-temperature lubricants. In order to be able to use these high-temperature lubricants in non-cutting metal forming, they must be applied to workpieces and / or tools in the most uniform layer and distribution possible.

Der minimale Druck für die Suspension kann nahe an den Umgebungsdruck abgesenkt werden, vorteilhaft sind Drücke von 0,01 bis zu 15 bar. zweckmässig 0,1 bis 0,5 bar. Der Druck des Gases muss jeweils etwas höher als der Druck in der Suspension sein, um ein Zurückfliessen der Suspension in die Kanäle der Druckgaszuführung 8 zu verhindern.The minimum pressure for the suspension can be reduced close to the ambient pressure, pressures from 0.01 to 15 bar are advantageous. expediently 0.1 to 0.5 bar. The pressure of the gas must be somewhat higher than the pressure in the suspension in order to prevent the suspension from flowing back into the channels of the compressed gas supply 8.

Durch die Steuerung des Verhältnisses Gasmenge zu Suspension und der Druckverhältnisse lassen sich mit einer Vorrichtung minimale Mengen bis hinunter zu 10 g/min Suspension als feinst verteilter Nebel, ohne Verstopfungsgefahr für längste Zeiträume, versprühen.By controlling the ratio of gas volume to suspension and the pressure ratios, minimal amounts down to 10 g / min suspension can be sprayed as a finely distributed mist with no risk of clogging for long periods of time.

Claims (7)

1. Process for the very fine spraying of suspensions by means of a pressurised gas by an air atomiser nozzle and a device comprising a spray head with nozzle opening (3), a plunger (4) arranged in the interior of the spray head and slidable through the nozzle opening and a sieve member (6) arranged between the inlet (2) for the suspension and the nozzle opening (3), with wiping device (7) for the sieve member, characterised in that the pressurised gas is saturated or supersaturated with a liquid.
2. Process according to claim 1, characterised in that air is used as pressurised gas and water as liquid.
3. Process according to claims 1 and 2, characterised in that a water-miscible solvent is used as liquid.
4. Process according to claim 3, characterised in that alcohols with 1 to 8 C-atoms, glycols, glycol ethers or glycol ether esters are used as solvent.
5. Process according to claims 1 to 4, characterised in that a mixture of water and solvent is used as liquid.
6. Device for the very fine spraying of suspensions, containing a spray head with a nozzle - mouth piece (13), constructed as air atomiser nozzle, which is equipped with a pressurised gas inlet (8), a plunger (4) arranged in the interior of the spray head and slidable in front of the nozzle opening (3) and a sieve member (6), arranged between the inlet (2) for the suspension and the nozzle opening (3), with wiping device (7) for the sieve member, characterised in that the pressurised gas inlet is equipped with a device for the saturation or supersaturation of the gas.
7. Device according to claim 6, characterised in that in the piston (5) is provided a capillary (14) with a diameter of 0.4 to 0.6 mm, preferably of 0.5 mm, whereby, in a spraying pause, moistened pressurised gas flows into the nozzle opening (3) via the pressurised gas connection (12) through the capillary (14) and through the pressurised gas guide (8).
EP84105700A 1983-07-06 1984-05-18 Method and apparatus for spraying suspensions very finely Expired EP0131120B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84105700T ATE25598T1 (en) 1983-07-06 1984-05-18 PROCESS AND DEVICE FOR THE FINEST SPRAYING OF SUSPENSIONS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH370083 1983-07-06
CH3700/83 1983-07-06

Publications (2)

Publication Number Publication Date
EP0131120A1 EP0131120A1 (en) 1985-01-16
EP0131120B1 true EP0131120B1 (en) 1987-03-04

Family

ID=4261639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84105700A Expired EP0131120B1 (en) 1983-07-06 1984-05-18 Method and apparatus for spraying suspensions very finely

Country Status (9)

Country Link
EP (1) EP0131120B1 (en)
JP (1) JPS6022956A (en)
AR (1) AR240734A1 (en)
AT (1) ATE25598T1 (en)
CA (1) CA1234401A (en)
DE (1) DE3462442D1 (en)
ES (1) ES8504498A1 (en)
YU (1) YU45190B (en)
ZA (1) ZA844449B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005019444A1 (en) * 2005-04-21 2006-10-26 Glatt Gmbh Spray nozzle for a fluidized bed device

Families Citing this family (13)

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JPS6139080U (en) * 1984-08-11 1986-03-12 ジューキ株式会社 Automatic sewing machine safety device
JPS6227994A (en) * 1985-07-31 1987-02-05 ジューキ株式会社 Pattern data input apparatus
JPS62109594A (en) * 1985-11-08 1987-05-20 蛇の目ミシン工業株式会社 Automatic formation of embroidering data of combined pattern
JPS62129088A (en) * 1985-11-29 1987-06-11 蛇の目ミシン工業株式会社 Multipattern sewing machine
JPH0667420B2 (en) * 1987-02-14 1994-08-31 ブラザー工業株式会社 Automatic sewing machine
JPH10505280A (en) * 1995-06-27 1998-05-26 フィリップス エレクトロニクス ネムローゼ フェンノートシャップ Method and apparatus for supplying a fluid to a surface
DE10042325A1 (en) * 2000-08-29 2002-03-14 Alstom Power Nv Atomizer for e.g. water, paint or fuel, includes two-chamber regulator adjusting relative pressure between liquid and gas, whilst holding gas flow sensibly constant
EP1461125A4 (en) 2001-12-13 2007-03-28 Advanced Specialized Technolog Spraying system for dispersing and disseminating fluids
DE102004029158B3 (en) * 2004-06-17 2006-01-12 Schröder Maschinenbau KG injection device
US7572107B2 (en) 2007-04-20 2009-08-11 Adapco, Inc. Ultra low volume chemical delivery system and method
CN111389607B (en) * 2018-12-27 2022-01-04 广州合成材料研究院有限公司 Cleaning-free automatic spraying workstation
CN111889276B (en) * 2020-06-23 2022-07-22 云南国钛金属股份有限公司 Device that fused salt chlorination furnace chlorine spray gun dredged
CN114917746B (en) * 2022-06-16 2023-03-28 南通恒和环保科技有限公司 Waste gas purification tower spray set and waste gas purification tower

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH612365A5 (en) * 1976-06-21 1979-07-31 Lonza Ag Device for spraying disperse systems
CH622445A5 (en) * 1977-02-24 1981-04-15 Lonza Ag Device for spraying disperse systems
DE2724931A1 (en) * 1976-06-21 1977-12-29 Lonza Ag DEVICE FOR SPRAYING DISPERSE SYSTEMS
CH647061A5 (en) * 1980-05-13 1984-12-28 Lonza Ag METHOD AND DEVICE FOR SPRAYING DISPERSE SYSTEMS.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005019444A1 (en) * 2005-04-21 2006-10-26 Glatt Gmbh Spray nozzle for a fluidized bed device
DE102005019444B4 (en) * 2005-04-21 2008-02-28 Glatt Gmbh Spray nozzle for a fluidized bed device

Also Published As

Publication number Publication date
ZA844449B (en) 1985-02-27
EP0131120A1 (en) 1985-01-16
JPS6022956A (en) 1985-02-05
JPH0450069B2 (en) 1992-08-13
AR240734A1 (en) 1990-10-31
ES534043A0 (en) 1985-04-16
YU118584A (en) 1987-06-30
YU45190B (en) 1992-05-28
DE3462442D1 (en) 1987-04-09
CA1234401A (en) 1988-03-22
ES8504498A1 (en) 1985-04-16
ATE25598T1 (en) 1987-03-15

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