EP1211426A2 - Fan housing in particular for axial fan - Google Patents

Fan housing in particular for axial fan Download PDF

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Publication number
EP1211426A2
EP1211426A2 EP01127602A EP01127602A EP1211426A2 EP 1211426 A2 EP1211426 A2 EP 1211426A2 EP 01127602 A EP01127602 A EP 01127602A EP 01127602 A EP01127602 A EP 01127602A EP 1211426 A2 EP1211426 A2 EP 1211426A2
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EP
European Patent Office
Prior art keywords
fan housing
contour
housing according
blow
fan
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01127602A
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German (de)
French (fr)
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EP1211426B1 (en
EP1211426A3 (en
Inventor
Walter Georg Dr. Angelis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebm Papst St Georgen GmbH and Co KG
Original Assignee
Papst Motoren GmbH and Co KG
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Filing date
Publication date
Application filed by Papst Motoren GmbH and Co KG filed Critical Papst Motoren GmbH and Co KG
Publication of EP1211426A2 publication Critical patent/EP1211426A2/en
Publication of EP1211426A3 publication Critical patent/EP1211426A3/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y10S415/914—Device to control boundary layer

Definitions

  • the present invention relates to a fan housing with a flow passage a suction opening on one side and a discharge opening on the other side.
  • Fans are often used for applications in which there is a very evenly, in particular over the entire flow cross-section if possible laminar airflow arrives.
  • axial fans are used in printing machines used especially in a row next to each other to make large sheets of paper to apply an air flow from above after the printing process, so that these sheets can be placed on a pile of paper faster.
  • the highest possible fluid-mechanical surface pressure is to be created that acts on the bow, thereby the gravitational force when depositing the Supports arches and therefore those on the underside of the arch and when storing it pushes out obstructive air between the sheet to be deposited and the sheet last deposited.
  • the placement speed and placement quality have a direct influence on the Economy of a printing press, since it reduces the throughput speed of the Determine the printing press significantly. An improvement in storage and one For this reason, increasing the filing speed would have a direct increase the machine economy.
  • the present invention has for its object to provide a fan housing described, generic type with respect to the flow properties to improve the conveyed air flow, in particular in such a way that a the fan housing according to the invention is particularly suitable for the Use in printing machines described above is suitable.
  • Outflow contour means enclosing the flow cross section are designed in such a way that in an actual air flow that surrounds the fan operation, between the air flow and the surrounding, mostly still air shear layer forming a (large-scale, low-frequency) vortex formation at least is reduced.
  • the invention is based on the knowledge that there is naturally behind each fan Free jet that only forms after a certain distance with the ambient air and / or mixed with the free jet of neighboring fans.
  • This Open jets have the property that they have a relatively low degree of turbulence in the center exhibit. The blown out, moving mixes to the sides Air with the attracted, still air in a shear layer (entrainment effect). in this shear layer exists almost exclusively in large-scale, low-frequency vortex forms. These are long-lasting due to their high energy content.
  • the printed sheet is excited to vibrate at its natural frequency. Under certain circumstances, the natural frequency of the arch correlates with the vertebral detachment frequency. This mechanism prevents the filing speed from increasing and can also lead to intermittent disruptions in the filing process to lead.
  • the drawing figures show an axial fan housing 1 with an axial one Flow passage 2 with a suction opening 4 on one side and an opposite one Blow-out opening 6.
  • the suction opening 4 and the blow-out opening 6 have each have a circular outer contour. This essentially results in one annular configuration of the axial fan housing 1 (so-called wall ring).
  • Within the flow passage 2 are central holding means 8 for one Motor / fan wheel unit shown arranged, the holding means 8 via spoke-like Connecting elements 10 are connected to the outer housing ring.
  • Within the fan housing 1 is thus an annular or circular disk-shaped Flow cross section formed.
  • outflow contour means 12 enclosing its flow cross section are formed in the region of the blow-out opening 6.
  • These outflow contour means 12 consist of individual contour elements 14 which are distributed over the circumference of the blow-out opening 6 and which, starting from the edge area of the blow-out opening 6, at least partially protrude into the area of a flow shear layer which arises during operation and surrounds the actual air flow.
  • the contour elements 14 are designed in the manner of crown teeth, each with an approximately triangular contour. However, other polygonal and / or rounded contours can also be provided.
  • the contour elements 14 are fixed with a base (in the illustrated case a triangular base) at the opening edge of the blow-out opening 6 or in the region of the housing end face which surrounds it, while with their opposite tip or edge (as shown in their triangular shape) Tip) protrude axially in the direction of flow on the one hand and radially inwards or outwards on the other hand.
  • all contour elements 14 are oriented obliquely axially and radially inwards, namely at an angle ⁇ 1 to the radial plane (plane of the blow-out opening 6 or the housing end face) starting from the peripheral region of the blow-out opening 6.
  • part of the contour elements 14 are oriented obliquely axially and radially outwards at an angle ⁇ 2 .
  • contour elements 14, which protrude radially inwards at an angle ⁇ 1 and radially outwards at an angle ⁇ 2 are preferably provided in the circumferential direction.
  • angles ⁇ 1 and ⁇ 2 can be the same or different.
  • the respective angle ⁇ 1 or ⁇ 2 is in the range between 0 ° and 90 ° and - like the number, size and contour shape of the contour elements 14 - can be adapted and matched to the respective application, a combination of contour elements also being provided can differ from one another in shape and / or size and / or angular orientation.
  • FIG. 5 and 6 contain an example of a comparison of the mode of operation of a non-inventive embodiment (FIG. 5) without outflow contour means 12 and the inventive embodiment according to FIGS. 1 and 2 (FIG. 6).
  • FIG. 5 illustrates that in the case of a conventional “normal” axial fan, an outer shear layer 16a is created, which encloses an inner, undisturbed flow 18.
  • This outer shear layer 16a has a relatively large radially measured thickness d 1 and contains large-scale vortices and a large proportion of low-frequency excitation components. This leads to a relatively unstabilized air jet.
  • FIG. 5 illustrates that in the case of a conventional “normal” axial fan, an outer shear layer 16a is created, which encloses an inner, undisturbed flow 18.
  • This outer shear layer 16a has a relatively large radially measured thickness d 1 and contains large-scale vortices and a large proportion of low-frequency excitation components. This leads to a relatively
  • the invention results in a shear layer 16b with a smaller thickness d 2 and therein in a significant reduction in large-scale eddies, in a reduction in the low-frequency excitation components and thus in total in a stabilized air-free jet because the portion the undisturbed flow 18 is enlarged in relation to the entire flow cross section.
  • the invention is not based on the illustrated and described exemplary embodiments limited, but also includes all those having the same effect within the meaning of the invention Versions. Furthermore, the invention is not yet based on the claims 1 defined combination of features limited, but can also by any different combination of certain features of all of the total disclosed Individual characteristics must be defined. This means that basically everything Individual feature of claim 1 omitted or by at least one other Instead of the disclosed individual feature can be replaced. insofar is claim 1 merely as a first attempt at formulation for an invention to understand.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The housing (1) has a flow passage (2) having an intake opening (4) and an outlet opening (6). An outflow contouring mechanism (12) is arranged about the outlet opening and reduces a vortex formation within a shearing layer, generated during operation of the ventilator to surround an actual airflow and located between the airflow and surrounding air.

Description

Die vorliegende Erfindung betrifft ein Lüftergehäuse mit einem Strömungsdurchlaß mit einer einseitigen Ansaugöffnung und einer anderseitigen Ausblasöffnung.The present invention relates to a fan housing with a flow passage a suction opening on one side and a discharge opening on the other side.

Lüfter werden oftmals für Anwendungen eingesetzt, bei denen es auf eine sehr gleichmäßige, insbesondere über den ganzen Strömungsquerschnitt hinweg möglichst laminare Luftströmung ankommt. Beispielsweise werden in Druckmaschinen Axiallüfter insbesondere in einer Reihenanordnung nebeneinander verwendet, um große Papierbögen nach dem Druckvorgang von oben her mit einer Luftströmung zu beaufschlagen, damit diese Bögen schneller auf einen Papierstoß abgelegt werden können. Dabei soll ein möglichst hoher strömungsmechanischer Flächendruck hervorgerufen werden, der auf den Bogen wirkt, dadurch die Gravitationskraft bei der Ablage der Bögen unterstützt und somit die auf der Unterseite des Bogens und bei der Ablage hinderliche Luft zwischen abzulegendem und zuletzt abgelegtem Bogen herausdrückt. Die Ablagegeschwindigkeit und Ablagegüte haben direkten Einfluß auf die Wirtschaftlichkeit einer Druckmaschine, da sie die Durchlaufgeschwindigkeit der Druckmaschine maßgeblich bestimmen. Eine Verbesserung der Ablage und eine Erhöhung der Ablagegeschwindigkeit hätte aus diesem Grund einen direkten Anstieg der Maschinenwirtschaftlichkeit zur Folge.Fans are often used for applications in which there is a very evenly, in particular over the entire flow cross-section if possible laminar airflow arrives. For example, axial fans are used in printing machines used especially in a row next to each other to make large sheets of paper to apply an air flow from above after the printing process, so that these sheets can be placed on a pile of paper faster. The highest possible fluid-mechanical surface pressure is to be created that acts on the bow, thereby the gravitational force when depositing the Supports arches and therefore those on the underside of the arch and when storing it pushes out obstructive air between the sheet to be deposited and the sheet last deposited. The placement speed and placement quality have a direct influence on the Economy of a printing press, since it reduces the throughput speed of the Determine the printing press significantly. An improvement in storage and one For this reason, increasing the filing speed would have a direct increase the machine economy.

Es hat sich aber speziell bei solchen Lüfter- Anwendungen gezeigt, dass häufig der gewünschte Effekt nicht oder in noch nicht zufriedenstellendem Maße erreicht wird.However, it has been shown especially in such fan applications that the desired effect is not achieved or is not yet satisfactory.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Lüftergehäuse der eingangs beschriebenen, gattungsgemäßen Art bezüglich der Strömungseigenschaften des geförderten Luftstromes zu verbessern, und zwar insbesondere so, dass ein mit dem erfindungsgemäßen Lüftergehäuse ausgestatteter Lüfter sich besonders für den oben beschriebenen Einsatz in Druckmaschinen eignet.The present invention has for its object to provide a fan housing described, generic type with respect to the flow properties to improve the conveyed air flow, in particular in such a way that a the fan housing according to the invention is particularly suitable for the Use in printing machines described above is suitable.

Erfindungsgemäß wird dies dadurch erreicht, dass im Bereich der Ausblasöffnung deren Strömungsquerschnitt umschließende Abströmkonturmittel derart ausgebildet sind, dass in einer die im Lüfterbetrieb entstehende eigentliche Luftströmung umschließenden, sich zwischen der Luftströmung und der umgebenden, zumeist ruhenden Luft ausbildenden Scherschicht eine (großskalige, niederfrequente) Wirbelbildung zumindest reduziert wird.According to the invention, this is achieved in that in the area of the blow-out opening Outflow contour means enclosing the flow cross section are designed in such a way that in an actual air flow that surrounds the fan operation, between the air flow and the surrounding, mostly still air shear layer forming a (large-scale, low-frequency) vortex formation at least is reduced.

Die Erfindung basiert auf der Erkenntnis, dass sich hinter jedem Lüfter naturgemäß ein Freistrahl ausbildet, der sich erst nach einem bestimmten Abstand mit der Umgebungsluft und/oder mit dem Freistrahl von benachbarten Lüftern vermischt. Diese Freistrahlen besitzen die Eigenschaft, dass sie im Zentrum einen relativ niedrigen Turbulenzgrad aufweisen. Zu den Seiten hin vermischt sich die ausgeblasene, bewegte Luft mit der angezogenen, ruhenden Luft in einer Scherschicht (Entrainmenteffekt). in dieser Scherschicht existieren fast ausschließlich großskalige, niederfrequente Wirbelformen. Diese sind aufgrund ihres hohen Energiegehaltes langlebig. Bei der oben beschriebenen, bevorzugten Anwendung hat dies zur Folge, dass durch die Wirbelablösung der Druckbogen zu Schwingungen in seiner Eigenfrequenz angeregt wird. Unter Umständen korreliert sogar die Eigenfrequenz des Bogens mit der Wirbelablösefrequenz. Dieser Mechanismus verhindert eine Erhöhung der Ablagegeschwindigkeit und kann weiterhin zu zeitweilig auftretenden Störungen des Ablageprozesses führen.The invention is based on the knowledge that there is naturally behind each fan Free jet that only forms after a certain distance with the ambient air and / or mixed with the free jet of neighboring fans. This Open jets have the property that they have a relatively low degree of turbulence in the center exhibit. The blown out, moving mixes to the sides Air with the attracted, still air in a shear layer (entrainment effect). in this shear layer exists almost exclusively in large-scale, low-frequency vortex forms. These are long-lasting due to their high energy content. At the above described preferred application has the consequence that by the vertebral detachment the printed sheet is excited to vibrate at its natural frequency. Under certain circumstances, the natural frequency of the arch correlates with the vertebral detachment frequency. This mechanism prevents the filing speed from increasing and can also lead to intermittent disruptions in the filing process to lead.

Durch die erfindungsgemäßen Abströmkonturmittel, die bevorzugt kronenzackenartig um die Ausblasseite des Lüfters herum angeordnet sind, werden die großskaligen Wirbel in der Scherschicht zerschlagen bzw. deren Entstehung von vorneherein verhindert. Die Anregungsenergie der Luftströmung auf den Papierbogen bei der bevorzugten Anwendung wird somit drastisch reduziert und dadurch eine Wellenbildung auf den Bogen verhindert oder zumindest reduziert. Die wesentlichen Vorteile sind somit:

  • Stabilisierung des Luftfreistrahls
  • Reduktion der großskaligen Wirbel im Randbereich des Luftfreistrahls
  • Verminderung der niederfrequenten Anregungsbestandteile
  • Geräuschvorteile.
By means of the outflow contour means according to the invention, which are preferably arranged around the outlet side of the fan in the manner of crown teeth, the large-scale vortices in the shear layer are broken up or their formation is prevented from the outset. The excitation energy of the air flow on the paper sheet in the preferred application is thus drastically reduced, thereby preventing or at least reducing wave formation on the sheet. The main advantages are:
  • Stabilization of the air-free jet
  • Reduction of the large-scale eddies in the edge area of the air jet
  • Reduction of the low-frequency excitation components
  • Noise advantages.

Weitere vorteilhafte Ausgestaltungsmerkmale sind in den Unteransprüchen und der folgenden Beschreibung enthalten.Further advantageous design features are in the subclaims and following description included.

Anhand von zwei bevorzugten, in der Zeichnung veranschaulichten Ausführungsbeispielen soll die Erfindung genauer erläutert werden. Dabei zeigen:

Fig. 1
eine axiale Stirnansicht auf die Ausblasöffnung eines erfindungsgemäßen Lüftergehäuses in einer ersten Ausführungsform (Pfeilrichtung I gemäß Fig. 2),
Fig. 2
eine Seitenansicht in Pfeilrichtung II gemäß Fig. 1,
Fig. 3
eine Ansicht analog zu Fig. 1 einer zweiten Ausführungsform der Erfindung,
Fig. 4
eine Seitenansicht in Pfeilrichtung IV der Ausführung nach Fig. 3,
Fig. 5 u. 6
jeweils eine Halb-Seitenansicht einer nicht-erfindungsgemäßen Ausführung ohne Abströmkonturmittel (Fig. 5) und der erfindungsgemäßen Ausführung gemäß Fig. 1 und 2 (Fig. 6) zur Erläuterung der Wirkungsweise der Erfindung.
The invention will be explained in more detail with reference to two preferred exemplary embodiments illustrated in the drawing. Show:
Fig. 1
3 shows an axial end view of the blow-out opening of a fan housing according to the invention in a first embodiment (arrow direction I according to FIG. 2),
Fig. 2
2 shows a side view in the direction of arrow II according to FIG. 1,
Fig. 3
2 shows a view analogous to FIG. 1 of a second embodiment of the invention,
Fig. 4
3 shows a side view in the direction of arrow IV of the embodiment according to FIG. 3,
Fig. 5 u. 6
in each case a half side view of an embodiment not according to the invention without outflow contour means (FIG. 5) and the embodiment according to the invention according to FIGS. 1 and 2 (FIG. 6) to explain the mode of operation of the invention.

In den verschiedenen Figuren der Zeichnung sind gleiche Teile stets mit den gleichen Bezugszeichen versehen.In the different figures of the drawing, the same parts are always the same Provide reference numerals.

Die Zeichnungsfiguren zeigen ein Axiallüftergehäuse 1 mit einem axialen Strömungsdurchlaß 2 mit einer einseitigen Ansaugöffnung 4 und einer gegenüberliegenden Ausblasöffnung 6. Die Ansaugöffnung 4 und die Ausblasöffnung 6 weisen jeweils eine kreisförmige Außenkontur auf. Daraus resultiert eine im Wesentlichen ringförmige Ausgestaltung des Axiallüftergehäuses 1 (sogenannter Wandring). Innerhalb des Strömungsdurchlasses 2 sind zentrische Haltemittel 8 für eine nicht dargestellte Motor-/Lüfterradeinheit angeordnet, wobei die Haltemittel 8 über speichenartige Verbindungselemente 10 mit dem äußeren Gehäusering verbunden sind. Innerhalb des Lüftergehäuses 1 ist somit ein kreisring- beziehungsweise kreisscheibenförmiger Strömungsquerschnitt gebildet.The drawing figures show an axial fan housing 1 with an axial one Flow passage 2 with a suction opening 4 on one side and an opposite one Blow-out opening 6. The suction opening 4 and the blow-out opening 6 have each have a circular outer contour. This essentially results in one annular configuration of the axial fan housing 1 (so-called wall ring). Within the flow passage 2 are central holding means 8 for one Motor / fan wheel unit shown arranged, the holding means 8 via spoke-like Connecting elements 10 are connected to the outer housing ring. Within the fan housing 1 is thus an annular or circular disk-shaped Flow cross section formed.

Erfindungsgemäß sind im Bereich der Ausblasöffnung 6 deren Strömungsquerschnitt umschließende Abströmkonturmittel 12 ausgebildet. Diese Abströmkonturmittel 12 bestehen aus einzelnen, über den Umfang der Ausblasöffnung 6 verteilt angeordneten Konturelementen 14, die vom Randbereich der Ausblasöffnung 6 ausgehend zumindest teilweise in den Bereich einer im Betrieb entstehenden, die eigentliche Luftströmung umschließenden Strömungs- Scherschicht ragen. In den bevorzugten Ausführungsformen sind die Konturelemente 14 kronenzackenartig mit jeweils einer etwa dreieckigen Kontur ausgebildet. Es können aber auch andere mehreckige und/oder gerundete Konturen vorgesehen sein. In allen Fällen sind die Konturelemente 14 mit einer Basis (im dargestellten Fall einer Dreieck-Basis) am Öffnungsrand der Ausblasöffnung 6 oder im diese umschließenden Bereich der Gehäuse-Stirnfläche fest, während sie mit ihrer gegenüberliegenden Spitze oder Kante (wie dargestellt in ihrer Dreieck-Spitze) einerseits axial in Strömungsrichtung und andererseits schräg radial nach innen oder außen ragen. Bei der ersten Ausführungsform nach Fig. 1 und 2 sind alle Konturelemente 14 schräg axial und radial nach innen ausgerichtet, und zwar unter einem Winkel ϕ1 zur Radialebene (Ebene der Ausblasöffnung 6 bzw. der Gehäuse-Stirnfläche) ausgehend vom Umfangsbereich der Ausblasöffnung 6.According to the invention, outflow contour means 12 enclosing its flow cross section are formed in the region of the blow-out opening 6. These outflow contour means 12 consist of individual contour elements 14 which are distributed over the circumference of the blow-out opening 6 and which, starting from the edge area of the blow-out opening 6, at least partially protrude into the area of a flow shear layer which arises during operation and surrounds the actual air flow. In the preferred embodiments, the contour elements 14 are designed in the manner of crown teeth, each with an approximately triangular contour. However, other polygonal and / or rounded contours can also be provided. In all cases, the contour elements 14 are fixed with a base (in the illustrated case a triangular base) at the opening edge of the blow-out opening 6 or in the region of the housing end face which surrounds it, while with their opposite tip or edge (as shown in their triangular shape) Tip) protrude axially in the direction of flow on the one hand and radially inwards or outwards on the other hand. In the first embodiment according to FIGS. 1 and 2, all contour elements 14 are oriented obliquely axially and radially inwards, namely at an angle ϕ 1 to the radial plane (plane of the blow-out opening 6 or the housing end face) starting from the peripheral region of the blow-out opening 6.

Bei der zweiten Ausführung nach Fig. 3 und 4 sind ein Teil der Konturelemente 14 unter einem Winkel ϕ2 schräg axial und radial nach außen ausgerichtet. Wie dargestellt sind vorzugsweise in Umfangsrichtung jeweils abwechselnd im Winkel ϕ1 schräg radial nach innen ragende Konturelemente und im Winkel ϕ2 schräg radial nach außen ragende Konturelemente 14 vorgesehen. In the second embodiment according to FIGS. 3 and 4, part of the contour elements 14 are oriented obliquely axially and radially outwards at an angle ϕ 2 . As shown, contour elements 14, which protrude radially inwards at an angle ϕ 1 and radially outwards at an angle ϕ 2 , are preferably provided in the circumferential direction.

Es sei bemerkt, dass die Winkel ϕ1 und ϕ2 gleich oder ungleich sein können. Der jeweilige Winkel ϕ1 bzw. ϕ2 liegt im Bereich zwischen 0° und 90° und kann - ebenso wie die Anzahl, Größe und Konturform der Konturelemente 14 - auf den jeweiligen Anwendungsfall angepaßt und abgestimmt werden, wobei auch eine Kombination von Konturelementen vorgesehen sein kann, die sich voneinander in Form und/oder Größe und/oder Winkelausrichtung unterscheiden.It should be noted that the angles ϕ 1 and ϕ 2 can be the same or different. The respective angle ϕ 1 or ϕ 2 is in the range between 0 ° and 90 ° and - like the number, size and contour shape of the contour elements 14 - can be adapted and matched to the respective application, a combination of contour elements also being provided can differ from one another in shape and / or size and / or angular orientation.

Die Fig. 5 und 6 enthalten beispielhaft eine Gegenüberstellung der Wirkungsweise einer nicht-erfindungsgemäßen Ausführung (Fig. 5) ohne Abströmkonturmittel 12 und der erfindungsgemäßen Ausführung nach Fig. 1 und 2 (Fig. 6). In Fig. 5 ist veranschaulicht, dass bei einem herkömmlichen "normalen" Axiallüfter eine äußere Scherschicht 16a entsteht, die eine innere, ungestörte Strömung 18 umschließt. Diese äußere Scherschicht 16a weist eine relativ große radial gemessene Dicke d1 auf und enthält großskalige Wirbel und einen großen Anteil an niederfrequenten Anregungsbestandteilen. Dies führt zu einem relativ unstabilisierten Luftfreistrahl. Im Gegensatz dazu wird durch Fig. 6 deutlich, dass die Erfindung zu einer Scherschicht 16b mit geringerer Dicke d2 und darin zu einer deutlichen Reduzierung von großskaligen Wirbeln, zu einer Verminderung der niederfrequenten Anregungsbestandteile und damit insgesamt zu einem stabilisierten Luftfreistrahl führt, weil der Anteil der ungestörten Strömung 18 bezogen auf den gesamten Strömungsquerschnitt vergrößert ist.5 and 6 contain an example of a comparison of the mode of operation of a non-inventive embodiment (FIG. 5) without outflow contour means 12 and the inventive embodiment according to FIGS. 1 and 2 (FIG. 6). FIG. 5 illustrates that in the case of a conventional “normal” axial fan, an outer shear layer 16a is created, which encloses an inner, undisturbed flow 18. This outer shear layer 16a has a relatively large radially measured thickness d 1 and contains large-scale vortices and a large proportion of low-frequency excitation components. This leads to a relatively unstabilized air jet. In contrast, it is clear from FIG. 6 that the invention results in a shear layer 16b with a smaller thickness d 2 and therein in a significant reduction in large-scale eddies, in a reduction in the low-frequency excitation components and thus in total in a stabilized air-free jet because the portion the undisturbed flow 18 is enlarged in relation to the entire flow cross section.

Die Erfindung ist nicht auf die dargestellten und beschriebenen Ausführungsbeispiele beschränkt, sondern umfaßt auch alle im Sinne der Erfindung gleichwirkenden Ausführungen. Ferner ist die Erfindung bislang auch noch nicht auf die im Anspruch 1 definierte Merkmalskombination beschränkt, sondern kann auch durch jede beliebige andere Kombination von bestimmten Merkmalen aller insgesamt offenbarten Einzelmerkmalen definiert sein. Dies bedeutet, daß grundsätzlich praktisch jedes Einzelmerkmal des Anspruchs 1 weggelassen bzw. durch mindestens ein an anderer Stelle der Anmeldung offenbartes Einzelmerkmal ersetzt werden kann. Insofern ist der Anspruch 1 lediglich als ein erster Formulierungsversuch für eine Erfindung zu verstehen.The invention is not based on the illustrated and described exemplary embodiments limited, but also includes all those having the same effect within the meaning of the invention Versions. Furthermore, the invention is not yet based on the claims 1 defined combination of features limited, but can also by any different combination of certain features of all of the total disclosed Individual characteristics must be defined. This means that basically everything Individual feature of claim 1 omitted or by at least one other Instead of the disclosed individual feature can be replaced. insofar is claim 1 merely as a first attempt at formulation for an invention to understand.

Claims (7)

Lüftergehäuse (1) mit einem Strömungsdurchlaß (2) mit einer Ansaugöffnung (4) und einer Ausblasöffnung (6),
dadurch gekennzeichnet,dass im Bereich der Ausblasöffnung (6) deren Strömungsquerschnitt umschließende Abströmkonturmittel (12) derart ausgebildet sind, dass in einer die im Lüfterbetrieb entstehende eigentliche Luftströmung (18) umschließenden, sich zwischen der Luftströmung (18) und der umgebenden Luft ausbildenden Scherschicht (16) eine Wirbelbildung zumindest reduziert wird.Fan housing (1) with a flow passage (2) with a suction opening (4) and a blow-out opening (6),
characterized in that in the region of the blow-out opening (6) the outflow contour means (12) enclosing its flow cross-section are designed in such a way that in a shear layer (between the air flow (18) and the surrounding air) that surrounds the actual air flow (18) that arises during fan operation. 16) a vortex formation is at least reduced. Lüftergehäuse nach Anspruch 1,
gekennzeichnet durch eine Ausgestaltung als Axiallüftergehäuse (1), wobei die Ansaugöffnung (4) und die Ausblasöffnung (6) jeweils eine kreisförmige Außenkontur aufweisen und einander axial gegenüberliegend angeordnet sind, und wobei insbesondere innerhalb des Strömungsdurchlasses (2) Haltemittel (8) für eine Motor-Lüfterradeinheit angeordnet sind.Fan housing according to claim 1,
characterized by a design as an axial fan housing (1), the suction opening (4) and the outlet opening (6) each having a circular outer contour and being arranged axially opposite one another, and in particular within the flow passage (2) holding means (8) for a motor Fan wheel unit are arranged. Lüftergehäuse nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass die Abströmkonturmittel (12) aus einzelnen, über den Umfang der Ausblasöffnung (6) verteilt angeordneten, vom Randbereich der Ausblasöffnung (6) ausgehenden und zumindest teilweise in den Bereich der entstehenden Strömungs-Scherschicht (16b) ragenden Konturelementen (14) bestehen. Fan housing according to claim 1 or 2,
characterized in that the outflow contour means (12) consist of individual contour elements (14) which are distributed over the circumference of the blow-out opening (6) and which extend from the edge area of the blow-out opening (6) and at least partially protrude into the area of the resulting flow shear layer (16b) consist. Lüftergehäuse nach Anspruch 3,
dadurch gekennzeichnet, dass die Konturelmente (14) kronenzackenartig mit einer etwa dreieckigen Kontur ausgebildet sind.Fan housing according to claim 3,
characterized in that the contour elements (14) are formed like a crown prong with an approximately triangular contour. Lüftergehäuse nach Anspruch 3 oder 4,
dadurch gekennzeichnet, dass alle Konturelemente (14) schräg axial und radial nach innen ausgerichtet sind.Fan housing according to claim 3 or 4,
characterized in that all contour elements (14) are oriented obliquely axially and radially inwards. Lüftergehäuse nach Anspruch 3 oder 4,
dadurch gekennzeichnet, dass ein Teil der Konturelemente (14) schräg axial und radial nach außen ausgerichtet sind.Fan housing according to claim 3 or 4,
characterized in that part of the contour elements (14) are oriented obliquely axially and radially outwards. Lüftergehäuse nach Anspruch 6,
dadurch gekennzeichnet,dass in Umfangsrichtung jeweils abwechselnd schräg radial nach innen ragende Konturelmente (14) und schräg radial nach außen ragende Konturelemente (14) vorgesehen sind.Fan housing according to claim 6,
characterized in that contour elements (14) projecting obliquely radially inward and radially outwardly projecting contour elements (14) are provided alternately in the circumferential direction.
EP01127602A 2000-12-01 2001-11-20 Fan housing in particular for axial fan Expired - Lifetime EP1211426B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20020512 2000-12-01
DE20020512U 2000-12-01

Publications (3)

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EP1211426A2 true EP1211426A2 (en) 2002-06-05
EP1211426A3 EP1211426A3 (en) 2003-07-23
EP1211426B1 EP1211426B1 (en) 2006-06-07

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Application Number Title Priority Date Filing Date
EP01127602A Expired - Lifetime EP1211426B1 (en) 2000-12-01 2001-11-20 Fan housing in particular for axial fan

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US (1) US6659719B2 (en)
EP (1) EP1211426B1 (en)
AT (1) ATE329157T1 (en)
DE (2) DE20118939U1 (en)

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Also Published As

Publication number Publication date
US20020067988A1 (en) 2002-06-06
ATE329157T1 (en) 2006-06-15
EP1211426B1 (en) 2006-06-07
US6659719B2 (en) 2003-12-09
DE50110023D1 (en) 2006-07-20
EP1211426A3 (en) 2003-07-23
DE20118939U1 (en) 2002-04-25

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