EP0204688A2 - Aerating device for liquids - Google Patents

Aerating device for liquids Download PDF

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Publication number
EP0204688A2
EP0204688A2 EP86890128A EP86890128A EP0204688A2 EP 0204688 A2 EP0204688 A2 EP 0204688A2 EP 86890128 A EP86890128 A EP 86890128A EP 86890128 A EP86890128 A EP 86890128A EP 0204688 A2 EP0204688 A2 EP 0204688A2
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EP
European Patent Office
Prior art keywords
stator
rotor
liquid
flow channels
flow
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EP86890128A
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German (de)
French (fr)
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EP0204688B1 (en
EP0204688A3 (en
EP0204688B2 (en
Inventor
Heinrich Dr. Techn. Dipl.-Ing. Ebner
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Heinrich Frings GmbH and Co KG
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Heinrich Frings GmbH and Co KG
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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
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2334—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer
    • B01F23/23342—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer the stirrer being of the centrifugal type, e.g. with a surrounding stator

Definitions

  • the invention relates to a ventilation device for liquids, consisting of an air and liquid-conveying rotor with a vertical axis of rotation and a stator surrounding the rotor, which has a closed ring of flow channels with a rectangular cross section for the liquid-air mixture, the vertical boundary surfaces of which are opposite each other an axial plane passing through the respective boundary surface in the region of the inner circumference of the stator are inclined in the direction of rotation of the rotor.
  • the ventilation air drawn in axially via a central air line with the liquid also drawn in axially by the rotor is conveyed radially outward with intimate mixing into the stator, which consists of two ring disks arranged at an axial distance from one another and out vertical guide walls inserted between these ring washers.
  • the flow channels which are delimited by the vertical guide walls and are rectangular in cross section, cause the liquid-air mixture to flow out into the liquid to be aerated, so that uniform ventilation of the liquid can be achieved in a certain area around the stator.
  • the ventilation becomes weaker because the flow velocity of the liquid-air mixture decreases. This means that the diameter of the container receiving the liquid to be aerated must not exceed a certain dimension in order to ensure a uniform ventilation of the liquid over the entire container cross-section at a given rotor output.
  • the invention is therefore based on the object of improving a ventilation device of the type described at the outset with simple means such that, with a given rotor output, uniform ventilation can also be achieved over a larger container cross section.
  • the invention achieves the stated object in that the adjacent vertical boundary surfaces of flow channels arranged directly next to one another diverge against the outer circumference of the stator, the vertical boundary surfaces of each flow channel running parallel to one another at most with a deviation of 7 °.
  • the vertical boundary surfaces of the individual flow channels run at least essentially parallel to one another, the exit velocity of the liquid-air mixture from the flow channels can be increased considerably compared to conventional stators with simple guide walls without having to increase the rotor power.
  • the higher exit velocity of the liquid-air mixture requires a correspondingly larger outlet width of the liquid-air mixture, so that even ventilation of larger container cross sections can be ensured.
  • This results in particularly advantageous design conditions because the size and shape of the rotor determine the ejection volume of air and liquid and thus the desired ventilation rate, while the formation of the flow channels of the stator is responsible for the range of the liquid-air mixture ejected.
  • the exit velocity of the liquid-air mixture ejected from the stator can be influenced by the shape of the flow channels. If the vertical boundary surfaces of the individual flow channels diverge towards the outer circumference of the stator, the exit velocity of the liquid-air mixture is correspondingly reduced compared to the entry velocity into the stator. If the exit velocity is to be increased, the flow cross section of the flow channels towards the exit end must be reduced by the vertical boundary surfaces converging towards the outer circumference of the stator. However, the angle between the vertical boundary surfaces of the individual flow channels must not exceed 7 °, unless increased eddy formation is to be accepted. In this context, it must be borne in mind that turbulent flows considerably limit the possible range of the liquid-air mixture expelled.
  • the flow channels can be designed differently.
  • the arranged washers are provided.
  • a particularly advantageous construction results, however, if the flow channels consist of U-profiles placed on an annular disc. This design not only offers advantageous manufacturing conditions with a comparatively low cost of materials, but also allows simple stator cleaning because the gusset areas between the individual U-profiles forming the flow channels are freely accessible.
  • the ventilation device shown which is arranged directly above a container base 1, essentially consists of a rotor 2, which is driven by a motor 3, and a stator 4 surrounding the rotor 2.
  • the vertical rotor shaft 5 passes through the Container bottom 1, on which the motor 3 is flanged.
  • the air to be introduced into the liquid of the container is sucked in via an air line 6 and fed axially to the rotor 2, which at the same time draws liquid from the container via an annular opening 7 of the stator 4 and conveys it with the air into the stator, as indicated by the flow arrows is.
  • the liquid-air mixture is received in flow channels 8 which, according to FIGS. 1 to 3, are formed by vertical webs 9 which are inserted between two annular disks 10 and 11.
  • the arrangement is such that adjacent webs 9 of flow channels 8 arranged directly next to one another diverge towards the outer circumference of the stator 4, so that the vertical boundary surfaces of the flow channels 8 run parallel to one another.
  • This configuration results in an exit velocity of the flow from the flow channels 8 which corresponds approximately to the entry velocity of the liquid-air mixture conveyed by the rotor 2 into the stator 4, so that the flow continues over a large radius into the container due to the comparatively high exit velocity.
  • This ensures even ventilation of containers of larger diameters if a corresponding number of flow channels ensures that the flows of adjacent flow channels do not diverge too much, especially against the region of the peripheral wall of the container.
  • a particularly simple stator construction can be obtained in that the flow channels 8 are formed by U-profiles 12 which are placed on an annular disk 13.
  • This design not only ensures simple manufacture, but also offers advantages in terms of stator cleaning because the gusset areas between adjacent flow channels are freely accessible.
  • the vertical boundary surfaces of the individual flow channels 8 can deviate from their parallel course. If, for example, the webs 9 of the individual flow channels 8 are arranged diverging towards the outer circumference of the stator 4, the flow within the flow channels 8 is slowed down. The angle ⁇ between the vertical webs 9 must not exceed 7 °, since otherwise with An increased eddy formation is to be expected, which greatly limits the range of the flow emerging from the flow channels 8.
  • the webs 9 can converge towards the outside, as is indicated in FIG. 6.
  • the angle a between the vertical webs 9 of the individual flow channels must be limited to a maximum of 7 °.
  • stator With the help of the aeration device shown, the special design of the stator enables liquid to be evenly ventilated over larger base areas, these aeration devices being particularly suitable for use in submerged vinegar fermentation, in yeast production or in wastewater treatment.
  • the invention is of course not limited to the illustrated embodiment of a ventilation device.
  • very differently constructed rotors can be used. B. is possible to suck liquid not only according to FIG. 1 on one side, but on both sides of the rotor.
  • the rotor construction can also be carried out in such a way that the air can be drawn in from below the rotor and that the motor is mounted in the container above the rotor in the form of a submersible motor of known design. Of course, any gas other than air can be drawn in and distributed in any given liquid.
  • the inclination of the flow channels 8 with respect to the radial direction is then to be determined, the number of flow channels being selected depending on the inclination of the flow channels and the container diameter.
  • adjacent webs 9 of flow channels 8 arranged directly next to one another can be formed by a common intermediate body which has a wedge-shaped shape in plan, so that in turn the vertical boundary surfaces of each flow comb run at least substantially parallel.

Abstract

1. A device for aerating liquids comprising : a rotor (2) whose rotational axis is vertical and which is disposed near the bottom of a tank and which intakes air and liquid ; and a stator (4) which extends around the rotor (2) and has a closed ring of right-angled cross-section flow ducts (8) each having an entry for the liquid-air mixture, the flow ducts (8) being inclined relatively to the radial direction in the direction of rotation of the rotor (2), characterised in that the flow ducts (8) are separated from one another by wedge-shaped gaps whose vertices are disposed between the immediately adjacent inlets, and the vertical boundary surfaces of each flow duct (8) either extend parallel to one another or converge or diverge at an angle of at most 7 degrees.

Description

Die Erfindung bezieht sich auf eine Belüftungsvorrichtung für Flüssigkeiten, bestehend aus einem Luft und Flüssigkeit förderden Rotor mit vertikaler Drehachse und aus einem den Rotor umgebenden Stator, der einen geschlossenen Kranz von im Querschnitt rechtwinkeligen Strömungskanälen für das Ftüssigkeit-Luftgemisch aufweist, deren vertikale Begrenzungsflächen jeweils gegenüber einer im Bereich des Statorinnenumfanges durch die jeweilige Begrenzungsfläche gehenden Axialebene in Rotordrehrichtung geneigt sind.The invention relates to a ventilation device for liquids, consisting of an air and liquid-conveying rotor with a vertical axis of rotation and a stator surrounding the rotor, which has a closed ring of flow channels with a rectangular cross section for the liquid-air mixture, the vertical boundary surfaces of which are opposite each other an axial plane passing through the respective boundary surface in the region of the inner circumference of the stator are inclined in the direction of rotation of the rotor.

Bei bekannten Belüftungsvorrichtungen dieser Art (AT-PS 269 038) wird die über eine zentrale Luftleitung axial angesaugte Belüftungsluft mit der ebenfalls vom Rotor axial angesaugten Flüssigkeit unter inniger Vermischung radial auswärts in den Stator gefördert, der aus zwei mit axialem Abstand voneinander angeordneten Ringscheiben und aus zwischen diesen Ringscheiben eingesetzten vertikalen Leitwänden besteht. Die durch die vertikalen Leitwände begrenzten, im Querschnitt rechtwinkeligen Strömungskanäle bewirken ein gerichtetes Ausströmen des Flüssigkeit-Luftgemisches in die zu belüftende Flüssigkeit, so daß in einem bestimmten Bereich um den Stator eine gleichmäßige Belüftung der Flüssigkeit erzielt werden kann. Mit wachsender Entfernung vom Außenumfang des Stators wird jedoch die Belüftung schwächer, weil die Strömungsgeschwindigkeit des Flüssigkeit-Luftgemisches abnimmt. Dies bedeutet, daß der Durchmesser des die zu belüftende Flüssigkeit aufnehmenden Behälters ein bestimmtes Maß nicht übersteigen darf, um bei einer vorgegebenen Rotorleistung eine gleichmäßige Belüftung der Flüssigkeit über den gesamten Behälterquerschnitt sicherzustellen.In known ventilation devices of this type (AT-PS 269 038), the ventilation air drawn in axially via a central air line with the liquid also drawn in axially by the rotor is conveyed radially outward with intimate mixing into the stator, which consists of two ring disks arranged at an axial distance from one another and out vertical guide walls inserted between these ring washers. The flow channels, which are delimited by the vertical guide walls and are rectangular in cross section, cause the liquid-air mixture to flow out into the liquid to be aerated, so that uniform ventilation of the liquid can be achieved in a certain area around the stator. With increasing distance from the outer circumference of the stator, however, the ventilation becomes weaker because the flow velocity of the liquid-air mixture decreases. This means that the diameter of the container receiving the liquid to be aerated must not exceed a certain dimension in order to ensure a uniform ventilation of the liquid over the entire container cross-section at a given rotor output.

Der Erfindung liegt somit die Aufgabe zugrunde, eine Belüftungsvorrichtung der eingangs geschilderten Art mit einfachen Mitteln so zu verbessern, daß bei einer gegebenen Rotorleistung eine gleichmäßige Belüftung auch über einen größeren Behälterquerschnitt erreicht werden kann.The invention is therefore based on the object of improving a ventilation device of the type described at the outset with simple means such that, with a given rotor output, uniform ventilation can also be achieved over a larger container cross section.

Die Erfindung löst die gestellte Aufgabe dadurch, daß die benachbarten vertikalen Begrenzungsflächen unmittelbar nebeneinander angeordneter Strömungskanäle gegen den Außenumfang des Stators divergieren, wobei die vertikalen Begrenzungsflächen jedes Strömungskanales höchstens mit einer Abweichung von 7° zueinander parallel verlaufen.The invention achieves the stated object in that the adjacent vertical boundary surfaces of flow channels arranged directly next to one another diverge against the outer circumference of the stator, the vertical boundary surfaces of each flow channel running parallel to one another at most with a deviation of 7 °.

Da zufolge dieser Maßnahmen die vertikalen Begrenzungsflächen der einzelnen Strömungskanäle zumindest im wesentlichen parallel zueinander verlaufen, kann die Austrittsgeschwindigkeit des Flüssigkeit-Luftgemisches aus den Strömungskanälen gegenüber herkömmlichen Statoren mit einfachen Leitwänden erheblich gesteigert werden, ohne die Rotorleistung vergrößern zu müssen. Die höhere Austrittsgeschwindigkeit des Flüssigkeit-Luftgemisches bedingt eine entsprechend größere Austrittsweite des Flüssigkeit Luftgemisches, so daß eine gleichmäßige Belüftung auch größerer Behälterquerschnitte sichergestellt werden kann. Dabei ergeben sich besonders vorteilhafte Konstruktionsverhältnisse, weil die Größe und Formgebung des Rotors das Auswurfvolumen von Luft und Flüssigkeit und damit die erwünschte Belüftungsrate bestimmen, während die Ausbildung der Strömungskanäle des Stators für die Reichweite des ausgestoßenen Flüssigkeit-Luftgemisches verantwortlich ist. Die Austrittsgeschwindigkeit des aus dem Stator ausgestoßenen Flüssigkeit-Luftgemisches kann über die Formgebung der Strömungskanäle beeinflußt werden. Divergieren die vertikalen Begrenzungsflächen der einzelnen Strömungskanäle gegen den Außenumfang des Stators hin, so wird die Austrittsgeschwindigkeit des Flüssigkeit-Luftgemisches gegenüber der Eintrittsgeschwindig keit in den Stator entsprechend verringert. Soll die Austrittsgeschwindigkeit gesteigert werden, so ist der Strömungsquerschnitt der Strömungskanäle gegen das Austrittsende hin zu vermindern, indem die vertikalen Begrenzungsflächen gegen den Statoraußenumfang konvergieren. Der Winkel zwischen den vertikalen Begrenzungsflächen der einzelnen Strömungskanäle darf allerdings 7° nicht übersteigen, wenn nicht eine vermehrte Wirbelbildung in Kauf genommen werden soll. In diesem Zusammenhang muß nämlich bedacht werden, daß turbulente Strömungen die mögliche Reichweite des ausgestoßenen Flüssigkeit-Luftgemisches erheblich einschränken.As a result of these measures, the vertical boundary surfaces of the individual flow channels run at least essentially parallel to one another, the exit velocity of the liquid-air mixture from the flow channels can be increased considerably compared to conventional stators with simple guide walls without having to increase the rotor power. The higher exit velocity of the liquid-air mixture requires a correspondingly larger outlet width of the liquid-air mixture, so that even ventilation of larger container cross sections can be ensured. This results in particularly advantageous design conditions because the size and shape of the rotor determine the ejection volume of air and liquid and thus the desired ventilation rate, while the formation of the flow channels of the stator is responsible for the range of the liquid-air mixture ejected. The exit velocity of the liquid-air mixture ejected from the stator can be influenced by the shape of the flow channels. If the vertical boundary surfaces of the individual flow channels diverge towards the outer circumference of the stator, the exit velocity of the liquid-air mixture is correspondingly reduced compared to the entry velocity into the stator. If the exit velocity is to be increased, the flow cross section of the flow channels towards the exit end must be reduced by the vertical boundary surfaces converging towards the outer circumference of the stator. However, the angle between the vertical boundary surfaces of the individual flow channels must not exceed 7 °, unless increased eddy formation is to be accepted. In this context, it must be borne in mind that turbulent flows considerably limit the possible range of the liquid-air mixture expelled.

Mit zunehmendem Behälterdurchmesser ist darauf zu achten, daß der Abstand zwischen den Strömungen zweier benachbarter Strömungskanäle im Bereich der Behätterumfangswand nicht zu groß wird, damit eine gleichmäßige Belüftung der Behälterflüssigkeit auch im Bereich der Umfangswand des Behälters gewährleistet werden kann.As the container diameter increases, care must be taken to ensure that the distance between the flows of two adjacent flow channels in the region of the peripheral wall of the container does not become too large, so that uniform ventilation of the container liquid can also be ensured in the region of the peripheral wall of the container.

Um auch bei größeren Behälterdurchmesser einen zulässigen Maximalabstand zwischen den Strömungen benachbarter Kanäle nicht zu überschreiten, ist folglich für eine entsprechende Anzahl von Strömungskanälen zu sorgen.In order not to exceed a permissible maximum distance between the flows of adjacent channels, even with larger container diameters, a corresponding number of flow channels must therefore be provided.

Die Strömungskanäle können unterschiedlich ausgebildet sein. So ist es beispielsweise möglich, die Strömungskanäle durch Stegbleche zu bilden, die zwischen zwei mit axialem Abstand voneinan-The flow channels can be designed differently. For example, it is possible to form the flow channels by means of web plates which are axially spaced between two

der angeordneten Ringscheiben vorgesehen sind. Eine besonders vorteilhafte Konstruktion ergibt sich allerdings, wenn die Strömungskanäle aus auf einer Ringscheibe aufgesetzten U-Profilen bestehen. Diese Ausbildung bietet nicht nur vorteilhafte Herstellungsbedingungen mit einem vergleichsweise geringen Materialaufwand, sondern erlaubt sich eine einfache Statorreinigung, weil die Zwickelbereiche zwischen den einzelnen die Strömungskanäle bildenden U-Profilen frei zugänglich sind.the arranged washers are provided. A particularly advantageous construction results, however, if the flow channels consist of U-profiles placed on an annular disc. This design not only offers advantageous manufacturing conditions with a comparatively low cost of materials, but also allows simple stator cleaning because the gusset areas between the individual U-profiles forming the flow channels are freely accessible.

In der Zeichnung ist der Erfindungsgegenstand beispielsweise dargestellt. Es zeigen:

  • Fig. 1 eine erfindungsgemäße Belüftungsvorrichtung für Flüssigkeiten in einer zum Teil aufgerissenen, schematischen Seitenansicht,
  • Fig. 2 den Stator dieser Belüftungsvorrichtung in einer zum Teil aufgerissenen Draufsicht,
  • Fig. 3 einen Schnitt durch einen Strömungskanal nach der Linie 111-111 der Fig. 2 in einem größeren Maßstab,
  • Fig. 4 eine der Fig. 3 entsprechende Darstellung einer Konstruktionsvariante eines Strömungskanales,
  • Fig. 5 einen Horizontalschnitt durch einen Stator mit nach außen divergierenden Strömungskanälen und
  • Fig. 6 eine der Fig. 5 entsprechende Darstellung eines Stators mit nach außen konvergierenden Strömungskanälen.
The subject matter of the invention is shown in the drawing, for example. Show it:
  • 1 is a ventilation device according to the invention for liquids in a partially broken, schematic side view,
  • 2 shows the stator of this ventilation device in a partially opened top view,
  • 3 shows a section through a flow channel along the line 111-111 of FIG. 2 on a larger scale,
  • 4 shows a representation of a construction variant of a flow channel corresponding to FIG. 3,
  • Fig. 5 shows a horizontal section through a stator with outwardly diverging flow channels and
  • FIG. 6 shows a representation of a stator corresponding to FIG. 5 with flow channels converging towards the outside.

Gemäß dem Ausführungsbeispiel nach Fig. 2 besteht die dargestellte, unmittelbar über einem Behälterboden 1 angeordnete Belüftungsvorrichtung im wesentlichen aus einem Rotor 2, der von einem Motor 3 her angetrieben wird, und einem den Rotor 2 umgebenden Stator 4. Die vertikale Rotorwelle 5 durchsetzt dabei den Behälterboden 1, an dem der Motor 3 angeflanscht ist. Die in die Flüssigkeit des Behälters einzutragende Luft wird über eine Luftleitung 6 angesaugt und axial dem Rotor 2 zugeführt, der über eine Ringöffnung 7 des Stators 4 zugleich Flüssigkeit aus dem Behälter ansaugt und mit der Luft in den Stator fördert, wie dies durch die Strömungspfeile angedeutet ist.According to the exemplary embodiment according to FIG. 2, the ventilation device shown, which is arranged directly above a container base 1, essentially consists of a rotor 2, which is driven by a motor 3, and a stator 4 surrounding the rotor 2. The vertical rotor shaft 5 passes through the Container bottom 1, on which the motor 3 is flanged. The air to be introduced into the liquid of the container is sucked in via an air line 6 and fed axially to the rotor 2, which at the same time draws liquid from the container via an annular opening 7 of the stator 4 and conveys it with the air into the stator, as indicated by the flow arrows is.

Im Stator 4 wird das Flüssigkeit-Luftgemisch in Strömungskanälen 8 aufgenommen, die gemäß den Fig. 1 bis 3 durch vertikale Stege 9 gebildet werden, die zwischen zwei Ringscheiben 10 und 11 eingesetzt sind. Die Anordnung ist dabei so getroffen, daß benachbarte Stege 9 unmittelbar nebeneinander angeordneter Strömungskanäle 8 gegen den Außenumfang des Stators 4 hin divergieren, so daß die vertikalen Begrenzungsflächen der Strömungskanäle 8 zueinander parallel verlaufen. Diese Ausbildung bewirkt eine annähernd der Eintrittsgeschwindigkeit des vom Rotor 2 in den Stator 4 geförderten Flüssigkeit-Luftgemisches entsprechende Austrittsgeschwindigkeit der Strömung aus den Strömungskanälen 8, so daß sich aufgrund der vergleichsweise hohen Austrittsgeschwindigkeit die Strömung über einen großen Radius in den Behälter fortsetzt. Damit wird eine gleichmäßige Belüftung auch von Behältern größerer Durchmesser sichergestellt, wenn durch eine entsprechende Anzahl an Strömungskanälen dafür gesorgt wird, daß die Strömungen benachbarter Strömungskanäle vor allem gegen den Bereich der Umfangswand des Behälters hin nicht zu stark divergieren.In the stator 4, the liquid-air mixture is received in flow channels 8 which, according to FIGS. 1 to 3, are formed by vertical webs 9 which are inserted between two annular disks 10 and 11. The arrangement is such that adjacent webs 9 of flow channels 8 arranged directly next to one another diverge towards the outer circumference of the stator 4, so that the vertical boundary surfaces of the flow channels 8 run parallel to one another. This configuration results in an exit velocity of the flow from the flow channels 8 which corresponds approximately to the entry velocity of the liquid-air mixture conveyed by the rotor 2 into the stator 4, so that the flow continues over a large radius into the container due to the comparatively high exit velocity. This ensures even ventilation of containers of larger diameters if a corresponding number of flow channels ensures that the flows of adjacent flow channels do not diverge too much, especially against the region of the peripheral wall of the container.

Wie Fig. 4 zeigt, kann eine besonders einfache Statorkonstruktion dadurch erhalten werden, daß die Strömungskanäle 8 durch U-Profile 12 gebildet werden, die auf einer Ringscheibe 13 aufgesetzt sind. Diese Ausbildung gewährleistet nicht nur eine einfache Herstellung, sondern bietet auch Vorteile hinsichtlich der Statorreinigung, weil die Zwickelbereiche zwischen benachbarten Strömungskanälen frei zugänglich sind.As shown in FIG. 4, a particularly simple stator construction can be obtained in that the flow channels 8 are formed by U-profiles 12 which are placed on an annular disk 13. This design not only ensures simple manufacture, but also offers advantages in terms of stator cleaning because the gusset areas between adjacent flow channels are freely accessible.

Um die für die Belüftung eines Flüssigkeitsbehälters mit einem bestimmten Durchmesser erforderliche Austrittsgeschwindigkeit des Flüssigkeit-Luftgemisches aus dem Stator bei einer gegebenen Rotorleistung festlegen zu können, können die vertikalen Begrenzungsflächen der einzelnen Strömungskanäle 8 von ihrem parallelen Verlauf abweichen. Werden beispielsweise die Stege 9 der einzelnen Strömungskanäle 8 gegen den Außenumfang des Stators 4 hin divergierend angeordnet, so ergibt sich eine Verlangsamung der Strömung innerhalb der Strömungskanäle 8. Der Winkel α, zwischen den vertikalen Stegen 9 darf dabei 7° nicht übersteigen, da sonst mit einer vermehrten Wirbelbildung zu rechnen ist, was die Reichweite der aus den Strömungskanälen 8 austretenden Strömung stark einengt.In order to be able to determine the exit velocity of the liquid-air mixture from the stator for a given rotor power, which is required for the ventilation of a liquid container with a certain diameter, the vertical boundary surfaces of the individual flow channels 8 can deviate from their parallel course. If, for example, the webs 9 of the individual flow channels 8 are arranged diverging towards the outer circumference of the stator 4, the flow within the flow channels 8 is slowed down. The angle α between the vertical webs 9 must not exceed 7 °, since otherwise with An increased eddy formation is to be expected, which greatly limits the range of the flow emerging from the flow channels 8.

Soll die Strömungsgeschwindigkeit im Bereich des Außenumfanges des Stators 4 gegenüber der Eintrittsgeschwindigkeit gesteigert werden, so können die Stege 9 nach außen hin konvergieren, wie dies in Fig. 6 angedeutet ist. Auch in diesem Fall ist der Winkel a zwischen den vertikalen Stegen 9 der einzelnen Strömungskanäle auf höchstens 7° zu begrenzen.If the flow speed in the area of the outer circumference of the stator 4 is to be increased compared to the entry speed, the webs 9 can converge towards the outside, as is indicated in FIG. 6. In this case too, the angle a between the vertical webs 9 of the individual flow channels must be limited to a maximum of 7 °.

Mit Hilfe der dargestellten Belüftungsvorrichtung gelingt es durch die besondere Ausbildung des Stators Flüssigkeit über größere Grundflächen gleichmäßig zu belüften, wobei sich diese Belüftungsvorrichtungen vor allem für den Einsatz bei der submersen Essiggärung, bei der Hefeherstellung oder bei der Abwasserreinigung anbieten.With the help of the aeration device shown, the special design of the stator enables liquid to be evenly ventilated over larger base areas, these aeration devices being particularly suitable for use in submerged vinegar fermentation, in yeast production or in wastewater treatment.

Die Erfindung ist selbstverständlich nicht auf das dargestellte Ausführungsbeispiel einer Belüftungsvorrichtung beschränkt. So können beispielsweise sehr unterschiedlich aufgebaute Rotoren eingesetzt werden, wobei es z. B. möglich ist, Flüssigkeit nicht nur entsprechend Fig. 1 einseitig, sondern beidseitig des Rotors anzusaugen. Die Rotorkonstruktion kann auch so ausgeführt werden, daß die Luft von unterhalb des Rotors angesaugt werden kann, und daß der Motor in Form eines Tauchmotors bekannter Ausführung im Behälter über dem Rotor montiert wird. Natürlich kann auch jedes andere Gas als Luft angesaugt und in irgend einer gegebenen Flüssigkeit verteilt werden. In Abhängigkeit von der Rotorausbildung ist dann die Neigung der Strömungskanäle 8 gegenüber der radialen Richtung festzulegen, wobei die Anzahl der Strömungskanäle in Abhängigkeit von der Neigung der Strömungskanäle und dem Behälterdurchmesser zu wählen ist. Darüber hinaus können benachbarte Stege 9 unmittelbar nebeneinander angeordneter Strömungskanäle 8 durch einen gemeinsamen Zwischenkörper gebildet werden, der in seinem Grundriß keilförmige Gestalt aufweist, damit wiederum die vertikalen Begrenzungsflächen jedes Strömungskanies zumindest im wesentlichen parallel verlaufen.The invention is of course not limited to the illustrated embodiment of a ventilation device. For example, very differently constructed rotors can be used. B. is possible to suck liquid not only according to FIG. 1 on one side, but on both sides of the rotor. The rotor construction can also be carried out in such a way that the air can be drawn in from below the rotor and that the motor is mounted in the container above the rotor in the form of a submersible motor of known design. Of course, any gas other than air can be drawn in and distributed in any given liquid. Depending on the design of the rotor, the inclination of the flow channels 8 with respect to the radial direction is then to be determined, the number of flow channels being selected depending on the inclination of the flow channels and the container diameter. In addition, adjacent webs 9 of flow channels 8 arranged directly next to one another can be formed by a common intermediate body which has a wedge-shaped shape in plan, so that in turn the vertical boundary surfaces of each flow comb run at least substantially parallel.

Claims (2)

1. Belüftungsvorrichtung für Flüssigkeiten, bestehend aus einem Luft und Flüssigkeit fördernden Rotor (2) mit vertikaler Drehachse und aus einem den Rotor (2) umgebenden Stator (4), der einen geschlossenen Kranz von im Querschnitt rechtwinkeligen Strömungskanälen (8) für das Flüssigkeit-Luftgemisch aufweist, deren vertikale Begrenzungsfläche jeweils gegenüber einer im Bereich des Statorinnenumfanges durch die jeweilige Begrenzungsfläche gehenden Axialebene in Rotordrehrichtung geneigt sind, dadurch gekennzeichnet, daß die benachbarten vertikalen Begrenzungsflächen unmittelbar nebeneinander angeordneter Strömungskanäle (8) gegen den Außenumfang des Stators (4) divergieren, wobei die vertikalen Begrenzungsflächen jedes Strömungskanales (8) höchstens mit einer Abweichung von 7° zueinander parallel verlaufen.1. Aeration device for liquids, consisting of an air and liquid-conveying rotor (2) with a vertical axis of rotation and a stator (4) surrounding the rotor (2), which has a closed ring of flow channels (8) with a rectangular cross section for the liquid. Air mixture, the vertical boundary surface of which is inclined in the direction of rotation of the rotor relative to an axial plane passing through the respective boundary surface in the area of the stator, characterized in that the adjacent vertical boundary surfaces of flow channels (8) arranged directly next to one another diverge against the outer circumference of the stator (4), whereby the vertical boundary surfaces of each flow channel (8) run parallel to one another at most with a deviation of 7 °. 2. Belüftungsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Strömungskanäle (8) durch auf einer Ringscheibe (13) aufgesetzte U-Profile (12) gebildet sind.2. Ventilation device according to claim 1, characterized in that the flow channels (8) by U-profiles (12) placed on an annular disc (13) are formed.
EP86890128A 1985-06-05 1986-05-07 Aerating device for liquids Expired - Lifetime EP0204688B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0169685A AT383108B (en) 1985-06-05 1985-06-05 VENTILATION DEVICE FOR LIQUIDS
AT1696/85 1985-06-05

Publications (4)

Publication Number Publication Date
EP0204688A2 true EP0204688A2 (en) 1986-12-10
EP0204688A3 EP0204688A3 (en) 1988-06-22
EP0204688B1 EP0204688B1 (en) 1990-01-03
EP0204688B2 EP0204688B2 (en) 1992-11-11

Family

ID=3519010

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Application Number Title Priority Date Filing Date
EP86890128A Expired - Lifetime EP0204688B2 (en) 1985-06-05 1986-05-07 Aerating device for liquids

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EP (1) EP0204688B2 (en)
JP (1) JPS6244167A (en)
CN (1) CN86103733A (en)
AT (1) AT383108B (en)
BR (1) BR8602601A (en)
DE (1) DE3616680A1 (en)
ES (1) ES8703748A1 (en)
FI (1) FI88262C (en)
IN (1) IN165315B (en)
SU (1) SU1625330A3 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4207077A1 (en) * 1991-03-07 1992-09-10 Horst Adler Compact clarification plant for complete biological purificn. of waste water - has horizontal gap above line along which post-clarification chamber base meets second partition
DE9316251U1 (en) * 1993-10-25 1994-02-10 Charatjan Manuela Device for stirring or for stirring and simultaneously gassing liquids, suspensions and heterogeneous fluids
US5356570A (en) * 1992-09-10 1994-10-18 Heinrich Frings Gmbh & Co Kg Apparatus for aerating liquids
US5358671A (en) * 1992-07-17 1994-10-25 Outokumpu Mintec Oy Aerator device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0717440Y2 (en) * 1988-05-18 1995-04-26 株式会社荏原製作所 Mixing / aeration device
DE19519553C2 (en) * 1995-05-27 1997-04-24 Michael Dipl Ing Godzik Centrifugal aerator for introducing a gas into a liquid
DE102009044168A1 (en) 2009-10-02 2011-04-07 Green Finance Ag Process and apparatus for the continuous production of alkyl esters of higher fatty acids
CN102921320A (en) * 2012-11-05 2013-02-13 无锡托普搅拌设备有限公司 Gas-liquid dispersion stirrer
PT3367809T (en) * 2015-10-19 2019-04-30 Nestle Sa Apparatus and method for aeration of a food product
JP6598345B1 (en) * 2019-04-15 2019-10-30 エム・テクニック株式会社 Stirrer

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AT269083B (en) * 1966-04-05 1969-03-10 Frings Fa Heinrich Aerating device for liquids
US3690621A (en) * 1969-03-04 1972-09-12 Itsuko Tanaka Agitator
GB2043475A (en) * 1979-02-24 1980-10-08 Uk Uglekhimichesky Instit Improvements in or relating to aeration apparatuses
US4283357A (en) * 1978-02-28 1981-08-11 Trodhjems Mek. Versted A/S Device for distribution of a gas in a liquid medium

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FR2444494A1 (en) * 1978-12-21 1980-07-18 Jeumont Schneider Aeration of waste water - by submerged, vertical flow pump into which compressed air is injected from stationary supply system
JPS5823036U (en) 1981-07-31 1983-02-14 パイオニア株式会社 tape recorder

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
AT269083B (en) * 1966-04-05 1969-03-10 Frings Fa Heinrich Aerating device for liquids
US3690621A (en) * 1969-03-04 1972-09-12 Itsuko Tanaka Agitator
US4283357A (en) * 1978-02-28 1981-08-11 Trodhjems Mek. Versted A/S Device for distribution of a gas in a liquid medium
GB2043475A (en) * 1979-02-24 1980-10-08 Uk Uglekhimichesky Instit Improvements in or relating to aeration apparatuses

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4207077A1 (en) * 1991-03-07 1992-09-10 Horst Adler Compact clarification plant for complete biological purificn. of waste water - has horizontal gap above line along which post-clarification chamber base meets second partition
US5358671A (en) * 1992-07-17 1994-10-25 Outokumpu Mintec Oy Aerator device
US5356570A (en) * 1992-09-10 1994-10-18 Heinrich Frings Gmbh & Co Kg Apparatus for aerating liquids
DE9316251U1 (en) * 1993-10-25 1994-02-10 Charatjan Manuela Device for stirring or for stirring and simultaneously gassing liquids, suspensions and heterogeneous fluids

Also Published As

Publication number Publication date
IN165315B (en) 1989-09-16
SU1625330A3 (en) 1991-01-30
BR8602601A (en) 1987-02-03
DE3616680C2 (en) 1989-05-24
JPS6244167A (en) 1987-02-26
EP0204688B1 (en) 1990-01-03
FI862145A0 (en) 1986-05-21
FI88262B (en) 1993-01-15
ES555750A0 (en) 1987-03-01
AT383108B (en) 1987-05-25
JPH0313866B2 (en) 1991-02-25
FI88262C (en) 1993-04-26
DE3616680A1 (en) 1986-12-11
EP0204688A3 (en) 1988-06-22
FI862145A (en) 1986-12-06
EP0204688B2 (en) 1992-11-11
CN86103733A (en) 1986-12-17
ATA169685A (en) 1986-10-15
ES8703748A1 (en) 1987-03-01

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