EP2512737B1 - Method and device for cleaning, activating and pretreating a work piece by means of carbon dioxide snow particles - Google Patents

Method and device for cleaning, activating and pretreating a work piece by means of carbon dioxide snow particles Download PDF

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Publication number
EP2512737B1
EP2512737B1 EP10793169.3A EP10793169A EP2512737B1 EP 2512737 B1 EP2512737 B1 EP 2512737B1 EP 10793169 A EP10793169 A EP 10793169A EP 2512737 B1 EP2512737 B1 EP 2512737B1
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Prior art keywords
carbon dioxide
mixing apparatus
dioxide fluid
carrier gas
feed
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EP10793169.3A
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German (de)
French (fr)
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EP2512737A1 (en
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Andreas Michalske
David Kleinelümern
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Venjakob Maschinenbau GmbH and Co KG
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Venjakob Maschinenbau GmbH and Co KG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/003—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods using material which dissolves or changes phase after the treatment, e.g. ice, CO2

Definitions

  • the invention relates to a method and a device for cleaning, activating and pretreating workpieces by means of carbon dioxide snow particles, which are produced from a pressurized carbon dioxide fluid and at least one carrier pressure gas, wherein the carbon dioxide snow particles can be accelerated in an outlet nozzle and directed onto the workpiece.
  • a blasting method for cleaning surfaces in which in a beam line liquid carbon dioxide is supplied to a flowing carrier gas and is converted by relaxation in dry snow, and a device for producing dry ice, in particular for a blast cleaning of surfaces, comprising a feed line for carbon dioxide, a supply line for a carrier gas, a beam line for a dry snow gas mixture and a mixing region for the carbon dioxide and the carrier gas.
  • two process variants are distinguished, the so-called two-substance ring nozzle and the jet nozzle with agglomeration chamber.
  • the liquid carbon dioxide at the nozzle outlet of a first nozzle is expanded to ambient pressure.
  • the resulting carbon dioxide snow particles are made by a jacket jet, which consists of a second, the first nozzle concentric surrounding nozzle occurs, bundled from supersonic fast compressed air and accelerated.
  • the liquid carbon dioxide is the compressed air stream in a relaxation room, the so-called agglomeration chamber added.
  • the second process variant produces larger snow particles which are accelerated with the compressed air in a subsequent nozzle and lead to a significantly higher abrasiveness on the workpiece.
  • the object is achieved according to the method by the features of claim 1 and according to the device by the features of claim 4.
  • a method and a device for cleaning, activating or pretreating a workpiece by means of Carbon dioxide snow particles which are formed from a pressurized carbon dioxide fluid and at least one carrier pressure gas in a mixing device to which the carbon dioxide fluid and the carrier pressure gas are fed via separate feeders and wherein the carbon dioxide snow particles distribute and leave the mixing device via an outlet nozzle coupled to the mixing device, in the outlet nozzle accelerated and directed to the workpiece.
  • the feed device for the carbon dioxide fluid which opens into the mixing device does not precede an agglomeration chamber, nor does the feed device for the carbon dioxide fluid have an agglomeration chamber in which the liquid carbon dioxide fluid could be expanded prior to feeding into a mixing chamber, as in devices for producing carbon dioxide snow particles from the prior art ,
  • the invention has the advantages that, in the absence of an agglomeration chamber, unwanted agglomerates are not present, which in turn would lead to icing and clogging problems in the feed devices.
  • the apparatus according to the invention with the direct injection of liquid carbon dioxide fluid into the mixing device without prior relaxation of the carbon dioxide fluid and distribution in the carrier pressure gas, a particularly large amount of carbon dioxide snow particles is produced in small and solid form, which based on the projected area of the cleaning jet, a cleaning result can be achieved with very high quality.
  • further automation and acceleration in the production of carbon dioxide snow particles are achieved.
  • the device according to the invention allows considerable material savings, what in Compared to prior art blasting devices for miniaturization of the device according to the invention leads.
  • the carbon dioxide fluid is expediently fed centrically to the mixing device.
  • the feed device for the carbon dioxide fluid to project into the feed device opening into the mixing device via an edge-side boundary of the mixing device.
  • the feed device for the carbon dioxide fluid is arranged on the mixing device such that the feed end of the feed device facing the mixing device expediently ends in the center of the mixing device for the inflow of the carbon dioxide fluid into the mixing device.
  • the cleaning jet which comprises the carbon dioxide snow particles and the carrier compressed gas, is expediently set in rotation in the mixing device.
  • the rotation of the cleaning jet is achieved by a swirl insert arranged in the mixing device.
  • the effect of the swirl insert is in particular increased by the fact that it expediently extends within the mixing device from an inlet end for the carrier compressed gas to an outlet end.
  • the swirl insert is provided at an outlet end in the mixing device with a converging discharge opening and / or designed as such.
  • the feed device for the carbon dioxide fluid is expediently designed as a metering nozzle.
  • the amount and intensity of the carbon dioxide fluid supplied to the mixing device can be changed by adjusting the metering nozzle at the feed device for the carbon dioxide fluid or by using metering nozzles with different dimensions for the supply of carbon dioxide.
  • the feed end of the feed device for the carbon dioxide fluid is arranged in the direction of the outlet end of the mixing device in this.
  • the carrier compressed gas comprises at least air.
  • the mixing device and the outlet nozzle are integrally formed.
  • the mixing device is designed as a mixing chamber.
  • FIG. 1 shows a device 2 for cleaning, activating or pretreating workpieces (not shown) by means of carbon dioxide snow particles.
  • the apparatus 2 comprises a device wall 3, a mixing device 4, at the inlet end 6 of the mixing device 4 provided feeders 8 and 10 for the carbon dioxide fluid or for the carrier gas pressure and a provided at an outlet end 12 of the mixing device 4 outlet nozzle 14.
  • the Mixing device 4, the feeders 8, 10 and the outlet nozzle 14 integrally formed.
  • the feed device for the carbon dioxide fluid is provided as a separate component to the mixing device. If the feed device for the carbon dioxide fluid is formed separately, it can thus be exchanged for setting a metered quantity of the carbon dioxide fluid supplied to the mixing device and replaced by a feed device with a metering opening which is suitably dimensioned for the desired metering amount.
  • the feed device 8 for the carbon dioxide fluid has no expansion space or agglomeration chamber, but leads directly into the mixing device 4.
  • the feed device 8 for the carbon dioxide fluid ends with a feed end 16 in a central region or in the center of the mixing device 4.
  • the swirl insert 18 is arranged at the edge of the mixing device 4 and extending in the present embodiment from the inlet end 6 to the end of the spout 12 in the mixing device 4.
  • the swirl insert 18 for accelerating the mixture of carbon dioxide snow particles and carrier gas pressure similar to the formation of Outlet nozzle 14 on a converging discharge opening 20.
  • FIG. 2 shows in plan view a cross section through the device according to FIG. 1 along a plane 2-2 '.
  • the illustration of the cross section of the device 2 in the present embodiment shows radially from outside to inside the device wall 3, the swirl insert 18 as well as the discharge opening 20 of the swirl insert 18, which tapers in the direction of the outlet nozzle 14.
  • the mixing device 4 formed as a mixing chamber.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Nozzles (AREA)
  • Carbon And Carbon Compounds (AREA)

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Reinigungen, Aktivieren und Vorbehandeln von Werkstücken mittels Kohlendioxidschneepartikeln, welche aus einem unter Druck stehenden Kohlendioxidfluid und mindestens einem Trägerdruckgas erzeugt werden, wobei die Kohlendioxidschneepartikel in einer Auslassdüse beschleunigt und auf das Werkstück geleitet werden können.The invention relates to a method and a device for cleaning, activating and pretreating workpieces by means of carbon dioxide snow particles, which are produced from a pressurized carbon dioxide fluid and at least one carrier pressure gas, wherein the carbon dioxide snow particles can be accelerated in an outlet nozzle and directed onto the workpiece.

Strahlverfahren und Strahlvorrichtungen zum Reinigen, Vorbehandeln und Aktivieren von Oberflächen sind seit vielen Jahrzehnten Stand der Technik. Für die industrielle Reinigung von Werkzeugen und Formen, Maschinen und Anlagen sowie Bauteilen werden jedoch aufgrund der sich verschärfenden Umweltgesetze und des größeren Wettbewerbs seit einigen Jahren, neue, umweltfreundliche und kostengünstige Reinigungstechnologien gesucht.Blasting methods and blasting devices for cleaning, pretreating and activating surfaces have been state of the art for many decades. However, for the industrial cleaning of tools and molds, machinery and equipment as well as components, due to the tightening environmental laws and the increased competition for some years, new, environmentally friendly and cost-effective cleaning technologies are being sought.

Die Oberflächenbehandlung mit unterschiedlichen Formen von Kohlendioxid ist seit mehr als 30 Jahren in Erfindungen beschrieben. Das Strahlen mit unterschiedlichen Formen von Kohlendioxid (CO2) findet inzwischen in einigen Branchen Anwendung.The surface treatment with different forms of carbon dioxide has been described in inventions for more than 30 years. Blasting with different forms of carbon dioxide (CO2) is now used in some industries.

Aus der DE 2005 002 365 B3 ist ein Strahlverfahren zur Reinigung von Oberflächen bekannt, bei dem in einer Strahlleitung flüssiges Kohlendioxid einem strömenden Trägergas zugeführt wird und durch Entspannung in Trockenschnee umgewandelt wird, sowie eine Vorrichtung zur Erzeugung von Trockeneis, insbesondere für eine Strahlreinigung von Oberflächen, umfassend eine Speiseleitung für Kohlendioxid, eine Zuführleitung für ein Trägergas, eine Strahlleitung für ein Trockenschnee-GasGemisch und einen Mischbereich für das Kohlendioxid und das Trägergas.From the DE 2005 002 365 B3 is a blasting method for cleaning surfaces, in which in a beam line liquid carbon dioxide is supplied to a flowing carrier gas and is converted by relaxation in dry snow, and a device for producing dry ice, in particular for a blast cleaning of surfaces, comprising a feed line for carbon dioxide, a supply line for a carrier gas, a beam line for a dry snow gas mixture and a mixing region for the carbon dioxide and the carrier gas.

Beim Strahlen mit CO2-Schneestrahlen werden zwei Verfahrensvarianten unterschieden, die so genannte Zwei-Stoff-Ringdüse und die Strahldüse mit Agglomerationskammer. Bei der Zwei-Stoff-Ringdüse wird das flüssige Kohlendioxid am Düsenaustritt einer ersten Düse auf Umgebungsdruck entspannt. Die entstehenden Kohlendioxidschneepartikel werden durch einen Mantelstrahl, welcher aus einer zweiten, die erste Düse konzentrisch umgebenden Düse tritt, aus überschallschneller Druckluft gebündelt und beschleunigt.When blasting with CO2 snow jets, two process variants are distinguished, the so-called two-substance ring nozzle and the jet nozzle with agglomeration chamber. In the case of the two-substance annular nozzle, the liquid carbon dioxide at the nozzle outlet of a first nozzle is expanded to ambient pressure. The resulting carbon dioxide snow particles are made by a jacket jet, which consists of a second, the first nozzle concentric surrounding nozzle occurs, bundled from supersonic fast compressed air and accelerated.

Bei der zweiten Verfahrensvariante wird das flüssige Kohlendioxid dem Druckluftstrom in einem Entspannungsraum, der so genannten Agglomerationskammer, zudosiert. Im Vergleich zur Zwei-Stoff-Ringdüse entstehen bei der zweiten Verfahrensvariante größere Schneepartikel, welche mit der Druckluft in einer nachfolgenden Düse beschleunigt werden und zu einer deutlich höheren Abrasivität am Werkstück führen.In the second process variant, the liquid carbon dioxide is the compressed air stream in a relaxation room, the so-called agglomeration chamber added. In comparison with the two-substance annular nozzle, the second process variant produces larger snow particles which are accelerated with the compressed air in a subsequent nozzle and lead to a significantly higher abrasiveness on the workpiece.

Die Erzeugung von Kohlendioxidschneepartikeln mit den bekannten Verfahrensvarianten erfordert Strahldüsen mit einer vergleichsweise hohen Anzahl von Baugruppen. Außerdem wird bei den wenigen Strahldüsen lediglich eine vergleichsweise geringe Menge des flüssigen Kohlendioxids zur Erzeugung der Kohlendioxidschneepartikel verwendet. Der Rest des flüssigen Kohlendioxids entweicht als Kohlendioxidgas durch Verdampfung.The production of carbon dioxide snow particles with the known process variants requires jet nozzles with a comparatively high number of assemblies. In addition, only a comparatively small amount of the liquid carbon dioxide is used to produce the carbon dioxide snow particles in the few jet nozzles. The remainder of the liquid carbon dioxide escapes as carbon dioxide gas by evaporation.

Aufgabe der vorliegenden Erfindung ist es somit, ein Verfahren und eine Vorrichtung zum Reinigen, Aktivieren oder Vorbehandeln eines Werkstücks mittels Kohlendioxidschneepartikeln zur Verfügung zu stellen, womit eine besonders effiziente, automatisierte sowie besonders zügige und aufwandsarme Erzeugung der Kohlendioxidschneepartikel durchgeführt und eine besonders hohe Reinigungswirkung zu erzielt werden können.It is therefore an object of the present invention to provide a method and a device for cleaning, activating or pretreating a workpiece by means of carbon dioxide snow particles, whereby a particularly efficient, automated and particularly rapid and low-cost generation of the carbon dioxide snow particles is carried out and a particularly high cleaning effect is achieved can be.

Die Aufgabe wird verfahrensgemäß durch die Merkmale des Anspruchs 1 und vorrichtungsgemäß durch die Merkmale des Anspruchs 4 gelöst.The object is achieved according to the method by the features of claim 1 and according to the device by the features of claim 4.

Erfindungsgemäß sind ein Verfahren und eine Vorrichtung zum Reinigen, Aktivieren oder Vorbehandeln eines Werkstücks mittels Kohlendioxidschneepartikel angegeben, welche aus einem unter Druck stehenden Kohlendioxidfluid und mindestens einem Trägerdruckgas in einer Mischeinrichtung ausgebildet werden, welcher das Kohlendioxidfluid und das Trägerdruckgas über separate Zuführeinrichtungen zugeführt werden und worin sich die Kohlendioxidschneepartikel verteilen und über eine mit der Mischeinrichtung gekoppelte Auslassdüse die Mischeinrichtung verlassen, in der Auslassdüse beschleunigt und auf das Werkstück geleitet werden. Erfindungsgemäß ist der in die Mischeinrichtung mündenden Zuführeinrichtung für das Kohlendioxidfluid keine Agglomerationskammer vorgeschaltet noch weist die Zuführeinrichtung für das Kohlendioxidfluid eine Agglomerationskammer auf, worin das flüssige Kohlendioxidfluid wie bei Vorrichtungen zum Erzeugen von Kohlendioxidschneepartikeln aus dem Stand der Technik vor der Zuführung in eine Mischkammer entspannt werden könnte.According to the invention, a method and a device for cleaning, activating or pretreating a workpiece by means of Carbon dioxide snow particles, which are formed from a pressurized carbon dioxide fluid and at least one carrier pressure gas in a mixing device to which the carbon dioxide fluid and the carrier pressure gas are fed via separate feeders and wherein the carbon dioxide snow particles distribute and leave the mixing device via an outlet nozzle coupled to the mixing device, in the outlet nozzle accelerated and directed to the workpiece. According to the invention, the feed device for the carbon dioxide fluid which opens into the mixing device does not precede an agglomeration chamber, nor does the feed device for the carbon dioxide fluid have an agglomeration chamber in which the liquid carbon dioxide fluid could be expanded prior to feeding into a mixing chamber, as in devices for producing carbon dioxide snow particles from the prior art ,

Insbesondere weist die Erfindung die Vorteile auf, dass es mangels einer Agglomerationskammer gerade nicht zu unerwünschten Agglomeraten kommt, welche wiederum zu Vereisungssowie Verstopfungsproblemen in den Zuführeinrichtungen führen würden. Darüber hinaus wird bei der erfindungsgemäßen Vorrichtung mit der direkten Einspritzung von flüssigem Kohlendioxidfluid in die Mischeinrichtung ohne vorausgehender Entspannung des Kohlendioxidfluids und mit Verteilung im Trägerdruckgas eine besonders große Menge an Kohlendioxidschneepartikeln in kleiner und fester Form erzeugt, womit bezogen auf die projizierte Fläche des Reinigungsstrahls ein Reinigungsergebnis mit besonders hoher Qualität erzielt werden kann. Zudem wird mit erfindungsgemäßen Verfahren eine weitere Automatisierung und Beschleunigung in der Erzeugung von Kohlendioxidschneepartikeln erzielt. Außerdem erlaubt die erfindungsgemäße Vorrichtung erhebliche Materialeinsparungen, was im Vergleich zu Strahlvorrichtungen aus dem Stand der Technik zur Miniaturisierung der erfindungsgemäßen Vorrichtung führt.In particular, the invention has the advantages that, in the absence of an agglomeration chamber, unwanted agglomerates are not present, which in turn would lead to icing and clogging problems in the feed devices. In addition, in the apparatus according to the invention with the direct injection of liquid carbon dioxide fluid into the mixing device without prior relaxation of the carbon dioxide fluid and distribution in the carrier pressure gas, a particularly large amount of carbon dioxide snow particles is produced in small and solid form, which based on the projected area of the cleaning jet, a cleaning result can be achieved with very high quality. In addition, with methods according to the invention, further automation and acceleration in the production of carbon dioxide snow particles are achieved. In addition, the device according to the invention allows considerable material savings, what in Compared to prior art blasting devices for miniaturization of the device according to the invention leads.

Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Advantageous embodiments of the invention will become apparent from the dependent claims.

Zweckmäßigerweise wird das Kohlendioxidfluid der Mischeinrichtung zentrisch zugeführt.The carbon dioxide fluid is expediently fed centrically to the mixing device.

Weiterhin ist es zweckmäßig, dass die Zuführeinrichtung für das Kohlendioxidfluid mit dem in die Mischeinrichtung mündenden Zuführenden über eine randseitige Begrenzung der Mischeinrichtung in diese hineinragt.Furthermore, it is expedient for the feed device for the carbon dioxide fluid to project into the feed device opening into the mixing device via an edge-side boundary of the mixing device.

In vorteilhafter Weiterbildung ist die Zuführeinrichtung für das Kohlendioxidfluid dabei derart an der Mischeinrichtung angeordnet, dass das der Mischeinrichtung zugewandte Zuführende der Zuführeinrichtung für die Einströmung des Kohlendioxidfluids in die Mischeinrichtung zweckmäßigerweise im Zentrum der Mischeinrichtung endet. Um eine gleichmäßige Erzeugung und Verteilung der Kohlendioxidschneepartikel in der Mischeinrichtung zu erreichen, ist es durchaus zweckmäßig, die Zuführeinrichtung für das Kohlendioxidfluid bis ins Zentrum der Mischeinrichtung fortzuführen.In an advantageous development, the feed device for the carbon dioxide fluid is arranged on the mixing device such that the feed end of the feed device facing the mixing device expediently ends in the center of the mixing device for the inflow of the carbon dioxide fluid into the mixing device. In order to achieve a uniform production and distribution of the carbon dioxide snow particles in the mixing device, it is quite expedient to continue the feed device for the carbon dioxide fluid into the center of the mixing device.

Um das Reinigungsergebnis des Werkstücks weiter zu verbessern, wird zweckmäßigerweise der Reinigungsstrahl, welcher die Kohlendioxidschneepartikel und das Trägerdruckgas umfasst, in der Mischeinrichtung in Rotation versetzt. Die Rotation des Reinigungsstrahls wird durch einen in der Mischeinrichtung angeordneten Dralleinsatz erreicht.In order to further improve the cleaning result of the workpiece, the cleaning jet, which comprises the carbon dioxide snow particles and the carrier compressed gas, is expediently set in rotation in the mixing device. The rotation of the cleaning jet is achieved by a swirl insert arranged in the mixing device.

Die Wirkung des Dralleinsatzes wird insbesondere dadurch erhöht, dass sich dieser innerhalb der Mischeinrichtung zweckmäßigerweise von einem Eintrittsende für das Trägerdruckgas bis zu einem Austrittsende erstreckt.The effect of the swirl insert is in particular increased by the fact that it expediently extends within the mixing device from an inlet end for the carrier compressed gas to an outlet end.

Zweckmäßigerweise ist der Dralleinsatz an einem Austrittsende in der Mischeinrichtung mit einer konvergierenden Entladungsöffnung versehen und/oder als solche ausgebildet.Conveniently, the swirl insert is provided at an outlet end in the mixing device with a converging discharge opening and / or designed as such.

Um die Intensität des Reinigungsstrahls und die Verbrauchsmenge des flüssigen Kohlendioxidfluids besonders einfach zu regulieren, ist die Zuführeinrichtung für das Kohlendioxidfluid zweckmäßigerweise als Dosierdüse ausgebildet. Gemäß vorteilhafter Ausgestaltung kann die Menge und die Intensität des der Mischeinrichtung zugeführten Kohlendioxidfluids durch Einstellung der Dosierdüse an der Zuführeinrichtung für das Kohlendioxidfluid bzw. durch Verwendung von Dosierdüsen mit unterschiedlicher Dimensionierung für die Zufuhr des Kohlendioxids verändert werden.In order to regulate the intensity of the cleaning jet and the consumption amount of the liquid carbon dioxide fluid in a particularly simple manner, the feed device for the carbon dioxide fluid is expediently designed as a metering nozzle. According to an advantageous embodiment, the amount and intensity of the carbon dioxide fluid supplied to the mixing device can be changed by adjusting the metering nozzle at the feed device for the carbon dioxide fluid or by using metering nozzles with different dimensions for the supply of carbon dioxide.

Damit entfallen separate Einstellventile für die Zuführung und Dimensionierung sowie die Dosierung des flüssigen Kohlendioxidfluids in die Mischeinrichtung.This eliminates separate adjustment valves for the supply and dimensioning and the dosage of the liquid carbon dioxide fluid in the mixing device.

In vorteilhafter Ausgestaltung ist das Zuführende der Zuführeinrichtung für das Kohlendioxidfluid in Richtung auf das Austrittsende der Mischeinrichtung in dieser angeordnet.In an advantageous embodiment, the feed end of the feed device for the carbon dioxide fluid is arranged in the direction of the outlet end of the mixing device in this.

Zweckmäßigerweise umfasst das Trägerdruckgas mindestens Luft.Conveniently, the carrier compressed gas comprises at least air.

Gemäß vorteilhafter Ausgestaltung sind die Mischeinrichtung und die Auslassdüse einstückig ausgebildet. Zweckmäßigerweise ist die Mischeinrichtung als Mischkammer ausgebildet.According to an advantageous embodiment, the mixing device and the outlet nozzle are integrally formed. Conveniently, the mixing device is designed as a mixing chamber.

Im Folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnungen näher erläutert.In the following an embodiment of the invention will be explained in more detail with reference to the drawings.

Es zeigen:

Figur 1
eine Draufsicht auf einen Längsschnitt durch eine erfindungsgemäße Vorrichtung mit einer Mischeinrichtung und Zuführungen für Kohlendioxidfluid und Trägerdruckgas und
Figur 2
eine Draufsicht auf einen Querschnitt durch die Vorrichtung gemäß Figur 1.
Show it:
FIG. 1
a plan view of a longitudinal section through a device according to the invention with a mixing device and feeds for carbon dioxide fluid and carrier gas pressure and
FIG. 2
a plan view of a cross section through the device according to FIG. 1 ,

Figur 1 zeigt eine Vorrichtung 2 zum Reinigen, Aktivieren oder Vorbehandeln von Werkstücken (nicht gezeigt) mittels Kohlendioxidschneepartikel. Die Vorrichtung 2 umfasst eine Vorrichtungswand 3, eine Mischeinrichtung 4, an einem Eintrittsende 6 der Mischeinrichtung 4 vorgesehene Zuführeinrichtungen 8 und 10 für das Kohlendioxidfluid bzw. für das Trägerdruckgas sowie eine an einem Austrittsende 12 der Mischeinrichtung 4 vorgesehene Auslassdüse 14. Im vorliegenden Ausführungsbeispiel sind die Mischeinrichtung 4, die Zuführeinrichtungen 8, 10 und die Auslassdüse 14 einstückig ausgebildet. FIG. 1 shows a device 2 for cleaning, activating or pretreating workpieces (not shown) by means of carbon dioxide snow particles. The apparatus 2 comprises a device wall 3, a mixing device 4, at the inlet end 6 of the mixing device 4 provided feeders 8 and 10 for the carbon dioxide fluid or for the carrier gas pressure and a provided at an outlet end 12 of the mixing device 4 outlet nozzle 14. In the present embodiment, the Mixing device 4, the feeders 8, 10 and the outlet nozzle 14 integrally formed.

Alternativ ist die Zuführeinrichtung für das Kohlendioxidfluid als separates Bauteil zur Mischeinrichtung vorgesehen. Wenn die Zuführeinrichtung für das Kohlendioxidfluid separat ausgebildet ist, kann diese zur Einstellung einer Dosiermenge des der Mischeinrichtung zugeführten Kohlendioxidfluids somit ausgetauscht und durch eine Zuführeinrichtung mit für die gewünschte Dosiermenge geeignet dimensionierter Dosieröffnung ersetzt werden.Alternatively, the feed device for the carbon dioxide fluid is provided as a separate component to the mixing device. If the feed device for the carbon dioxide fluid is formed separately, it can thus be exchanged for setting a metered quantity of the carbon dioxide fluid supplied to the mixing device and replaced by a feed device with a metering opening which is suitably dimensioned for the desired metering amount.

Erfindungsgemäß weist die Zuführeinrichtung 8 für das Kohlendioxidfluid keinen Entspannungsraum oder Agglomerationskammer auf, sondern führt direkt in die Mischeinrichtung 4.According to the invention, the feed device 8 for the carbon dioxide fluid has no expansion space or agglomeration chamber, but leads directly into the mixing device 4.

Zur besonders gleichmäßigen Verteilung des flüssigen Kohlendioxidfluids in der Mischeinrichtung 4 endet die Zuführeinrichtung 8 für das Kohlendioxidfluid mit einem Zuführende 16 in einem zentralen Bereich bzw. im Zentrum der Mischeinrichtung 4. Zur Verbesserung des Reinigungsergebnisses wird der Reinigungsstrahl mit dem Trägerdruckgas und den Kohlendioxidschneepartikeln mit einem Dralleinsatz 18 in Rotation versetzt. Der Dralleinsatz 18 ist randseitig an der Mischeinrichtung 4 angeordnet und erstreckt sich im vorliegenden Ausführungsbeispiel vom Eintrittsende 6 bis zum Ausrittsende 12 in der Mischeinrichtung 4. Am Austrittsende 12 der Mischeinrichtung 4 weist der Dralleinsatz 18 zur Beschleunigung des Gemischs aus Kohlendioxidschneepartikeln und Trägerdruckgas ähnlich der Ausformung der Auslassdüse 14 eine konvergierende Entladungsöffnung 20 auf.For a particularly uniform distribution of the liquid carbon dioxide fluid in the mixing device 4, the feed device 8 for the carbon dioxide fluid ends with a feed end 16 in a central region or in the center of the mixing device 4. To improve the cleaning result of the cleaning jet with the carrier gas pressure and the carbon dioxide snow particles with a swirl insert 18 rotated. The swirl insert 18 is arranged at the edge of the mixing device 4 and extending in the present embodiment from the inlet end 6 to the end of the spout 12 in the mixing device 4. At the outlet end 12 of the mixing device 4, the swirl insert 18 for accelerating the mixture of carbon dioxide snow particles and carrier gas pressure similar to the formation of Outlet nozzle 14 on a converging discharge opening 20.

Figur 2 zeigt in Draufsicht einen Querschnitt durch die Vorrichtung gemäß Figur 1 entlang einer Ebene 2-2'. Die Abbildung des Querschnitts der Vorrichtung 2 im vorliegenden Ausführungsbeispiel zeigt radial von außen nach innen die Vorrichtungswand 3, den Dralleinsatz 18 sowie die sich in Richtung der Auslassdüse 14 verjüngende Entladungsöffnung 20 des Dralleinsatzes 18. Im Zentrum liegt die als Mischkammer ausgebildete Mischeinrichtung 4. FIG. 2 shows in plan view a cross section through the device according to FIG. 1 along a plane 2-2 '. The illustration of the cross section of the device 2 in the present embodiment shows radially from outside to inside the device wall 3, the swirl insert 18 as well as the discharge opening 20 of the swirl insert 18, which tapers in the direction of the outlet nozzle 14. In the center lies the mixing device 4 formed as a mixing chamber.

Zusammenfassend soll hervorgehoben werden, dass durch die erfindungsgemäße direkte Einspritzung von flüssigem Kohlendioxid in das Trägerdruckgas in der Mischeinrichtung, ohne das flüssige Kohlendioxid im Voraus in einer Agglomerationskammer zu entspannen, im Vergleich eine große Anzahl von kleinen und festen Kohlendioxidschneepartikeln erzeugt werden kann, wodurch schließlich ein besseres Reinigungsergebnis am Werkstück erzielt werden kann.In summary, it should be emphasized that by the direct injection according to the invention of liquid carbon dioxide into the carrier gas in the mixing device, without relaxing the liquid carbon dioxide in advance in an agglomeration chamber, a large number of small and solid carbon dioxide snow particles can be produced, whereby finally a better cleaning result on the workpiece can be achieved.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

22
Vorrichtungcontraption
33
Vorrichtungswandmeans wall
44
Mischeinrichtungmixing device
66
Eintrittsendeentry end
88th
erste Zuführeinrichtungfirst feeder
1010
zweite Zuführeinrichtungsecond feeder
1212
Austrittsendeexit end
1414
Auslassdüseoutlet nozzle
1616
Zuführendeafferent
1818
Dralleinsatzswirl insert
2020
Entladungsöffnungdischarge opening

Claims (14)

  1. Method for cleaning, activating or pretreating a workpiece by means of carbon dioxide snow particles, produced from a pressurized carbon dioxide fluid and at least one pressurized carrier gas, wherein the carbon dioxide fluid is fed, via a feed apparatus (8), into a mixing apparatus (4), into which the pressurized carrier gas flows, and carbon dioxide snow particles form in the mixing apparatus (4), disperse, the carbon dioxide snow particles and the carrier gas in the mixing apparatus (4) are rotated by a swirl insert (18) provided there, accelerated in an outlet nozzle and directed onto the workpiece, without the carbon dioxide fluid being expanded before being fed into the mixing apparatus (4).
  2. Method according to claim 1,
    characterized in that
    the carbon dioxide fluid is fed into the mixing apparatus (4) centrally.
  3. Method according to claim 1 or 2,
    characterized in that
    the dosing quantity of the carbon dioxide fluid fed into the mixing apparatus (4) can be altered.
  4. Device (2) for cleaning, activating or pretreating a workpiece by means of carbon dioxide snow particles with a mixing apparatus (4) for forming and dispersing the carbon dioxide snow particles in a pressurized carrier gas flowing into the mixing apparatus (4), with feed apparatuses (8, 10) opening into the mixing apparatus (4) to feed in the carbon dioxide fluid and the pressurized carrier gas, and with an outlet nozzle (14) for accelerating a mixture of carbon dioxide snow particles and pressurized carrier gas, wherein an agglomeration chamber for expanding the carbon dioxide fluid is not provided, characterized by a swirl insert (18) provided in the mixing apparatus (4).
  5. Device according to claim 4,
    characterized in that
    the swirl insert (18) inside the mixing apparatus (4) extends essentially from an entry end (6) for the pressurized carrier gas to an exit end (12) for the mixture of carbon dioxide snow particles and pressurized carrier gas.
  6. Device according to claim 4 or 5,
    characterized in that
    the swirl insert (18) forms a converging discharge opening (20) at an exit end (12) for the mixture of carbon dioxide snow particles and pressurized carrier gas.
  7. Device according to one of claims 4 to 6, characterized in that
    the feed apparatus (8) for the carbon dioxide fluid is formed as dosing nozzle.
  8. Device according to claim 7,
    characterized in that
    the dosing quantity of the carbon dioxide fluid fed into the mixing apparatus (4) can be adjusted via the feed apparatus (8).
  9. Device according to claim 8,
    characterized in that,
    for the adjustment of the dosing quantity of the carbon dioxide fluid fed into the mixing apparatus (4), the feed apparatus (8) for the carbon dioxide fluid is formed in an exchangeable manner.
  10. Device according to one of claims 4 to 9,
    characterized in that
    the feed apparatus (8) for the carbon dioxide fluid with a feed end (16) opening into the mixing apparatus (4) in the direction of an exit end (12) of the mixing apparatus (4) is arranged in the latter.
  11. Device according to one of claims 4 to 10,
    characterized in that
    the feed apparatus (8) for the carbon dioxide fluid with a feed end (16) opening into the mixing apparatus (4) is formed projecting into the latter via a boundary on the edge of the mixing apparatus (4).
  12. Device according to one of claims 4 to 11,
    characterized in that
    the pressurized carrier gas comprises at least air.
  13. Device according to one of claims 4 to 12,
    characterized in that
    the mixing apparatus (4) and the outlet nozzle (14) are formed in one piece.
  14. Device according to one of claims 4 to 13,
    characterized by
    the mixing apparatus (4) formed as mixing chamber.
EP10793169.3A 2009-12-15 2010-12-15 Method and device for cleaning, activating and pretreating a work piece by means of carbon dioxide snow particles Active EP2512737B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009058211A DE102009058211B4 (en) 2009-12-15 2009-12-15 Method and device for cleaning, activating and pretreating a workpiece by means of carbon dioxide snow particles
PCT/EP2010/007701 WO2011082795A1 (en) 2009-12-15 2010-12-15 Method and device for cleaning, activating and pretreating a work piece by means of carbon dioxide snow particles

Publications (2)

Publication Number Publication Date
EP2512737A1 EP2512737A1 (en) 2012-10-24
EP2512737B1 true EP2512737B1 (en) 2014-03-05

Family

ID=43806721

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10793169.3A Active EP2512737B1 (en) 2009-12-15 2010-12-15 Method and device for cleaning, activating and pretreating a work piece by means of carbon dioxide snow particles

Country Status (4)

Country Link
EP (1) EP2512737B1 (en)
DE (1) DE102009058211B4 (en)
ES (1) ES2458552T3 (en)
WO (1) WO2011082795A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019125443A1 (en) 2017-12-20 2019-06-27 Halliburton Energy Services, Inc. Capture and recycling methods for non-aqueous cleaning materials

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5184427A (en) * 1990-09-27 1993-02-09 James R. Becker Blast cleaning system
US5616067A (en) * 1996-01-16 1997-04-01 Ford Motor Company CO2 nozzle and method for cleaning pressure-sensitive surfaces
KR20040101948A (en) * 2004-05-31 2004-12-03 (주)케이.씨.텍 Nozzle for Injecting Sublimable Solid Particles Entrained in Gas for Cleaning Surface
DE102005002365B3 (en) 2005-01-18 2006-04-13 Air Liquide Gmbh Jet process for surface cleaning involves expanding carbon dioxide in the mixing region into carrier gas at static pressure less than 70 per cent of overall pressure
DE202005018953U1 (en) * 2005-12-02 2007-04-12 Kim Bettina Exhaust nozzle e.g. for dry ice jet plant, has depressing channel having round cross section and spiral arranged surface element which has pulled barrel
DE102006008959A1 (en) * 2006-02-23 2007-08-30 Hauni Maschinenbau Ag Cleaning drums of machines used in tobacco processing industry, employs nozzle fed with compressed air, dry ice and liquid carbon dioxide
DE102007014857A1 (en) * 2007-03-22 2008-09-25 Acp-Advanced Clean Production Gmbh Nozzle e.g. for pre-treatment and cleaning of surfaces using carbon dioxide snow, has propellant flow provided over supply nozzle and with chamber and which crosses into expanded outlet

Also Published As

Publication number Publication date
DE102009058211A1 (en) 2011-06-16
ES2458552T3 (en) 2014-05-06
WO2011082795A1 (en) 2011-07-14
DE102009058211B4 (en) 2013-09-05
EP2512737A1 (en) 2012-10-24

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