EP0943808B1 - Radial fan - Google Patents

Radial fan Download PDF

Info

Publication number
EP0943808B1
EP0943808B1 EP19990105557 EP99105557A EP0943808B1 EP 0943808 B1 EP0943808 B1 EP 0943808B1 EP 19990105557 EP19990105557 EP 19990105557 EP 99105557 A EP99105557 A EP 99105557A EP 0943808 B1 EP0943808 B1 EP 0943808B1
Authority
EP
European Patent Office
Prior art keywords
casing
tab
radial fan
curvature
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19990105557
Other languages
German (de)
French (fr)
Other versions
EP0943808A3 (en
EP0943808A2 (en
Inventor
Ulrich Beerschwinger
Karlheinz Breuninger
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 Landshut GmbH
Original Assignee
Ebm Papst Landshut GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE1998111877 external-priority patent/DE19811877C2/en
Application filed by Ebm Papst Landshut GmbH filed Critical Ebm Papst Landshut GmbH
Publication of EP0943808A2 publication Critical patent/EP0943808A2/en
Publication of EP0943808A3 publication Critical patent/EP0943808A3/en
Application granted granted Critical
Publication of EP0943808B1 publication Critical patent/EP0943808B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/422—Discharge tongues
    • 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
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings

Definitions

  • the invention relates to a radial fan with high specific Performance, especially with a drum runner and a housing in which a widening, as a pressure chamber acting pressure space spiraling to an outflow opening extends, and with one on the side walls of the Housing each having a throat radius housing tongue to separate the pressure chamber beginning and pressure chamber end.
  • Radial fans of the type mentioned are used in particular Office technology, household technology and heating technology as so-called.
  • Small fans are used and naturally a relatively high power density, i. which provided Airflow is relative to the dimensions relative high. This is especially true for radial fans operating in the mentioned application area, and here in particular in the Heating technology, may only have very small dimensions, because other components the installation space of such a small fan limit. For this reason, the blowers with so-called.
  • Drum runners equipped as wheels the allow a very high energy expenditure, i. to a high airflow.
  • Such housings become predominant, especially if used as exhaust fan (Hotsider) in heaters be formed or deep-drawn from aluminum or sheet steel.
  • the two housing halves are over a flange connected to each other, wherein the beaded edge on the Outside of the housing sits.
  • blowers with a round outlet opening are equipped, the dividing plane in the plane of symmetry placed.
  • From DE 43 13 617 is a volute casing of a radial fan known, in which a housing tongue far into the fan interior protrudes into it and so the tongue area in Continuation of the spiral line extended.
  • the tongue edge is from one fan wall to the other with a curvature provided and leads due to their extension to a nozzle-like Narrowing of the outlet.
  • the invention is based on the object, a radial fan the genus to improve so that its Air capacity is increased.
  • the task is characterized by the characteristics of Main claim solved.
  • the tongue radius over the course of the curvature in the Substantially changing, can be a targeted reduction the noise emission can be achieved.
  • the tongue radius Advantageously, the largest, at the point which is the largest exposure to air. In some Cases this is the middle of the case width, but mostly the motor side of the drum rotor.
  • the distance between the outer diameter of the drum rotor and the housing tongue along the curvature over the case width is the same.
  • a special training provides that a part of the pumped medium in the area of the housing tongue back into the Pressure chamber start is performed. This can be done by variation the shortest distance between the outside diameter of the Drum rotor and the housing can be achieved, the shortest distance in the range of the curvature can, he However, also in the direction of the field of Curvature be placed so that a wedge-shaped space between the tongue and the shortest distance place becomes. Also by this measure is the noise considerably reduced.
  • Fig. 1 shows a schematic CAD representation of the housing 3 of a radial fan with a substantially circular Outflow opening 5.
  • the transition between the outflow opening and the housing interior is towards the suction side formed by a housing tongue 6.
  • this housing tongue is essentially one just barrier between pressure chamber end 4 ", i.e. the space in the housing 3 in front of the discharge opening 5 and the pressure chamber beginning 4 '.
  • the housing tongue 6 goes on its edges with a throat radius in the respective side wall over.
  • Fig. 2 is an embodiment of the radial fan according to the invention shown.
  • the radial fan has a housing 3, in which a drum rotor 2 is received.
  • the Housing forms around the drum rotor around a widening Pressure chamber 4, which is essentially spiral extends to the discharge opening 5.
  • the pressure chamber 4 is by definition in a pressure chamber end 4 "and a Pressure chamber 4 'split, the pressure chamber end 4 " the area is, which then into the discharge opening. 5 passes.
  • the Pressure chamber end 4 In the direction of the drum rotor is the Pressure chamber end 4 "from the pressure chamber beginning 4 'through a housing tongue 6 separately.
  • This housing tongue 6 extends in the illustrated inventive design in one of the discharge opening adapted curvature over the entire width B of the housing Third
  • the tongue is usually facing at its pressure chamber Edge provided with a tongue radius 8, the at Radial fans of the type described, the one RadDurchmesser in the order of about 100-150 mm have, on the order of between about 5 mm and 8 mm is located.
  • the tongue designed the tongue so that the radius of the Symmetry plane steadily reduced on both sides, taking the radius in the middle region is preferably greater than 10 mm to 15 mm and the measure of 5 mm is only in the border areas is realized and even considerably smaller can be.
  • Radial fan Another criterion for the performance of a Radial fan is the distance between the drum rotor and the tongue. It can be provided in the invention be that this distance over the housing width substantially is equal to. This requires a corresponding topographical Design of the housing inner wall.
  • the shortest distance can lie in the area of curvature, but it can also be in Running direction according to the region of the curvature 7 of the housing tongue be located.
  • a wedge-shaped space 10 between the housing tongue and the shortest distance location formed (see Fig. 3).
  • the wedge angle ⁇ can vary depending on the requirement.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Description

Die Erfindung betrifft einen Radiallüfter mit hoher spezifischer Leistung, insbesondere mit einem Trommelläufer und einem Gehäuse, in dem ein sich erweiternder, als Druckraum wirkender Druckraum sich spiralförmig zu einer Ausströmöffnung erstreckt, und mit einer an den Seitenwänden des Gehäuses jeweils einen Kehlradius aufweisenden Gehäusezunge zur Trennung von Druckraumanfang und Druckraumende.The invention relates to a radial fan with high specific Performance, especially with a drum runner and a housing in which a widening, as a pressure chamber acting pressure space spiraling to an outflow opening extends, and with one on the side walls of the Housing each having a throat radius housing tongue to separate the pressure chamber beginning and pressure chamber end.

Radiallüfter der genannten Gattung werden insbesondere in der Bürotechnik, Haushalttechnik und Heiztechnik als sogen. Kleinventilatoren eingesetzt und besitzen naturgemäß eine relativ hohe Leistungsdichte, d.h. die erbrachte Luftleistung ist im Verhältnis zu den Abmessungen relativ hoch. Dies gilt insbesondere für Radiallüfter, die in dem genannten Einsatzgebiet, und hier insbesondere in der Heiztechnik, nur sehr geringe Abmessungen besitzen dürfen, da andere Bauteile den Einbauraum eines derartigen Kleinventilators begrenzen. Aus diesem Grund werden die Gebläse mit sogen. Trommelläufern als Laufräder ausgestattet, die einen sehr hohen Energieumsatz ermöglichen, d.h. zu einer hohen Luftleistung führen. Radial fans of the type mentioned are used in particular Office technology, household technology and heating technology as so-called. Small fans are used and naturally a relatively high power density, i. which provided Airflow is relative to the dimensions relative high. This is especially true for radial fans operating in the mentioned application area, and here in particular in the Heating technology, may only have very small dimensions, because other components the installation space of such a small fan limit. For this reason, the blowers with so-called. Drum runners equipped as wheels, the allow a very high energy expenditure, i. to a high airflow.

Da, wie angeführt, in der Regel der Platzbedarf vorgegeben ist, ergeben sich insbesondere bei derartigen Aufgabengebieten die folgenden Rahmenbedingungen:

  • 1. Es ist eine möglichst hohe Luftleistungs-Kennlinie (Druck-Volumenstrom-Kennlinie) zu erzeugen;
  • 2. im geforderten Betriebspunkt soll eine derartige Konstruktion wenig Geräusch abstrahlen;
  • 3. der geforderte Betriebspunkt ist mit einer möglichst geringen Aufnahmeleistung zu erreichen und beizubehalten.
    • Since, as stated, the space required is generally given, the following framework conditions arise, in particular in the case of such task areas:
  • 1. It is necessary to generate the highest possible air-power characteristic (pressure-volumetric flow characteristic);
  • 2. in the required operating point, such a construction should emit little noise;
  • 3. the required operating point is to be achieved and maintained with the lowest possible recording power.

    • In der Regel werden hierzu die Trommelläufer mit einem im Verhältnis zu den Außenabmessungen des Gebläses relativ großen Durchmesser benutzt. Dies führt jedoch im Verhältnis zu einem sehr kleinen Druckraum d.h. dem Raum zwischen dem Rad-Außenumfang und der Gehäuse-Innenseite. Da derartige Ventilatoren zumeist mit preiswerten zweipoligen Asynchronmotoren betrieben werden, deren Drehzahl entsprechend begrenzt ist, wird durch die Größe des Laufraddurchmessers eine relativ hohe Umfangsgeschwindigkeit erreicht, die auch für einen hohen Energieumsatz erforderlich ist. Da jedoch der Druckraum wegen des Platzmangels relativ klein gehalten ist, wird das "Schluckvermögen" der Gehäusespirale sehr schnell erreicht. As a rule, the drum runners with an im Relative to the external dimensions of the fan relative used large diameter. However, this results in proportion to a very small pressure space, i. the space between the outer circumference of the wheel and the inside of the case. There Such fans mostly with cheap bipolar Asynchronous motors are operated, their speed accordingly is limited by the size of the impeller diameter reaches a relatively high peripheral speed, which is also required for high energy expenditure. However, because the pressure chamber due to the lack of space relatively is kept small, the "swallowing power" of the housing spiral reached very quickly.

    Aus diesem Grund stellen die geringen Abmessungen des Raumes für den Radiallüfter einen internen Widerstand dar mit der Folge, daß

    • der große Raddurchmesser nur unzureichend ausgenutzt werden kann,
    • der Wirkungsgrad nicht ausgeschöpft wird und die Geräuschemissionen höher werden.
    For this reason, the small dimensions of the space for the radial fan constitute an internal resistance, with the result that
    • the large wheel diameter can only be used insufficiently,
    • the efficiency is not exhausted and the noise emissions are higher.

    Vom strömungstechnischen Standpunkt wird das Optimum bei den vorgegebenen Gehäuseabmessungen durch einen kleineren Raddurchmesser erzielt, wodurch auf der anderen Seite die geforderten spezifischen Leistungen jedoch nicht erzielt werden können. Aus gerätetechnischen Gründen und unter anderem auch aus Platzgründen ist oft eine kreisförmige Austrittsöffnung erforderlich.From the fluidic point of view, the optimum is added the given housing dimensions by a smaller Wheel diameter achieved, which on the other side of the but failed to achieve the required specific services can be. For technical reasons and among other things also for reasons of space is often a circular outlet opening required.

    Derartige Gehäuse werden überwiegend, insbesondere wenn sie als Abgasgebläse (Hotsider) in Heizgeräten verwendet werden, aus Aluminium oder Stahlblech geformt bzw. tiefgezogen. Die beiden Gehäusehälften werden über eine Bördelung miteinander verbunden, wobei der Bördelrand auf der Außenseite des Gehäuses sitzt. Aus Kostengründen wird bei solchen Gebläsen, die mit einer runden Austrittsöffnung ausgestattet sind, die Trennebene in die Symmetrieebene gelegt.Such housings become predominant, especially if used as exhaust fan (Hotsider) in heaters be formed or deep-drawn from aluminum or sheet steel. The two housing halves are over a flange connected to each other, wherein the beaded edge on the Outside of the housing sits. For cost reasons is at such blowers, with a round outlet opening are equipped, the dividing plane in the plane of symmetry placed.

    Aus der DE 43 13 617 ist ein Spiralgehäuse eines Radialgebläses bekannt, bei dem eine Gehäusezunge weit in den Gebläseinnenraum hinein ragt und so den Zungenbereich in Fortsetzung der Spirallinie verlängert. Die Zungenkante ist von einer Gebläsewand zur anderen mit einer Krümmung versehen und führt infolge ihrer Verlängerung zu einer düsenartigen Verengung der Austrittsöffnung.From DE 43 13 617 is a volute casing of a radial fan known, in which a housing tongue far into the fan interior protrudes into it and so the tongue area in Continuation of the spiral line extended. The tongue edge is from one fan wall to the other with a curvature provided and leads due to their extension to a nozzle-like Narrowing of the outlet.

    Durch die Verlängerung und Verengung des Austrittsquerschnitts kommt es zu unerwünschten Strömungs/Querschnittsprofilen, weshalb Leistungsverluste und insbesondere Resonanzerscheinungen zu erwarten sind.By the extension and narrowing of the outlet cross-section it comes to undesirable flow / cross-sectional profiles, why power losses and in particular Resonance phenomena are to be expected.

    Der Erfindung liegt die Aufgabe zugrunde, einen Radiallüfter der genannten Gattung so zu verbessern, daß seine Luftleistung erhöht wird.The invention is based on the object, a radial fan the genus to improve so that its Air capacity is increased.

    Die Aufgabe wird durch die Merkmale des Hauptanspruchs gelöst.The task is characterized by the characteristics of Main claim solved.

    Durch diese Maßnahme wird erzielt, dass sich zum einen die Geräuschabstrahlung reduziert und zum anderen, dass die scharfe Trennung zwischen Druckraumende und Druckraumanfang unterbleibt, wodurch das gasförmige Fördermedium im oberen Teil des Luftaustritts an der Zunge nicht mehr so scharf umgelenkt und so die negative Auswirkung einer solchen scharfen Umlenkung auf den Wirkungsgrad vermieden wird.By this measure is achieved that on the one hand the Noise emission reduced and on the other hand that the Sharp separation between pressure chamber end and pressure chamber start is omitted, whereby the gaseous medium in upper part of the air outlet on the tongue no longer so sharply diverted and so the negative impact of such sharp deflection on the efficiency avoided becomes.

    Dadurch, daß der qualitative Verlauf der Krümmung der Gehäusezunge der Kontur der Ausströmöffnung entspricht, ist ein optimaler Austritt des Druckluftstroms gewährleistet. Da sich der Zungenradius über den Verlauf der Krümmung im wesentlichen stetig verändert, kann eine gezielte Reduzierung der Geräuschabstrahlung erzielt werden. Der Zungenradius wird vorteilhafterweise an der Stelle am größten, an der die größte Beaufschlagung mit Luft erfolgt. In manchen Fällen ist dies die Mitte der Gehäusebreite, meist jedoch die Motorseite des Trommelläufers.Due to the fact that the qualitative course of the curvature of the housing tongue corresponds to the contour of the outflow, is ensures an optimal outlet of the compressed air flow. Since the tongue radius over the course of the curvature in the Substantially changing, can be a targeted reduction the noise emission can be achieved. The tongue radius Advantageously, the largest, at the point which is the largest exposure to air. In some Cases this is the middle of the case width, but mostly the motor side of the drum rotor.

    Günstig kann sein, daß der Abstand zwischen dem Außendurchmesser des Trommelläufers und der Gehäusezunge entlang der Krümmung über die Gehäusebreite gleich ist. Durch die Festlegung eines relativ geringen Abstands kann eine gute Trennung zwischen Druckraumanfang und Druckraumende erreicht werden, die vergleichbar wirkungsvoll ist wie bei einer geraden Gehäusezunge.It may be favorable that the distance between the outer diameter of the drum rotor and the housing tongue along the curvature over the case width is the same. By the determination of a relatively small distance can be a good separation between the beginning of the pressure chamber and the end of the pressure chamber be achieved, which is as effective as at a straight housing tongue.

    Eine besondere Ausbildung sieht vor, daß ein Teil des Fördermediums im Bereich der Gehäusezunge wieder in den Druckraumanfang geführt wird. Dies kann durch Variation des kürzesten Abstands zwischen dem Außendurchmesser des Trommelläufers und dem Gehäuse erzielt werden, wobei der kürzeste Abstand im Bereich der Krümmung liegen kann, er kann jedoch auch in Laufrichtung nach den Bereich der Krümmung gelegt werden, so daß ein keilförmiger Raum zwischen der Zunge und der Stelle des kürzesten Abstands gebildet wird. Auch durch diese Maßnahme wird die Geräuschbildung erheblich reduziert. A special training provides that a part of the pumped medium in the area of the housing tongue back into the Pressure chamber start is performed. This can be done by variation the shortest distance between the outside diameter of the Drum rotor and the housing can be achieved, the shortest distance in the range of the curvature can, he However, also in the direction of the field of Curvature be placed so that a wedge-shaped space between the tongue and the shortest distance place becomes. Also by this measure is the noise considerably reduced.

    Die Erfindung wird nachfolgend anhand in der Zeichnung dargestellter Ausführungsbeispiele näher erläutert.The invention is described below with reference to the drawing illustrated embodiments explained in more detail.

    In den Figuren zeigen:

    Fig. 1
    eine CAD-Darstellung eines Radiallüfters aus' dem Stand der Technik;
    Fig. 2
    einen erfindungsgemäßen Radiallüfter in gleicher Darstellung wie in Fig. 1;
    Fig. 3
    eine schematische Draufsicht auf einen erfindungsgemäßen Radiallüfter;
    In the figures show:
    Fig. 1
    a CAD representation of a radial fan from the 'prior art;
    Fig. 2
    a radial fan according to the invention in the same representation as in Fig. 1;
    Fig. 3
    a schematic plan view of a radial fan according to the invention;

    Fig. 1 zeigt in schematischer CAD-Darstellung das Gehäuse 3 eines Radiallüfters mit einer im wesentlichen kreisrunden Ausströmöffnung 5. Der Übergang zwischen der Ausströmöffnung und dem Gehäuseinnenraum zur Saugseite hin wird durch eine Gehäusezunge 6 gebildet. In der bekannten Ausführungsform ist diese Gehäusezunge im wesentlichen eine gerade Barriere zwischen Druckraumende 4", d.h. dem Raum im Gehäuse 3 vor der Ausströmöffnung 5 und den Druckraumanfang 4'. Die Gehäusezunge 6 geht an ihren Rändern mit einen Kehlradius in die jeweilige Seitenwand über.Fig. 1 shows a schematic CAD representation of the housing 3 of a radial fan with a substantially circular Outflow opening 5. The transition between the outflow opening and the housing interior is towards the suction side formed by a housing tongue 6. In the known embodiment this housing tongue is essentially one just barrier between pressure chamber end 4 ", i.e. the space in the housing 3 in front of the discharge opening 5 and the pressure chamber beginning 4 '. The housing tongue 6 goes on its edges with a throat radius in the respective side wall over.

    In Fig. 2 ist eine erfindungsgemäße Ausgestaltung des Radiallüfters dargestellt. Der Radiallüfter weist ein Gehäuse 3 auf, in dem ein Trommelläufer 2 aufgenommen ist. Das Gehäuse bildet um den Trommelläufer herum einen sich erweiternden Druckraum 4, der sich im wesentlichen spiralförmig zur Ausströmöffnung 5 erstreckt. Der Druckraum 4 ist definitionsgemäß in ein Druckraumende 4" und einen Druckraumanfang 4' aufgeteilt, wobei das Druckraumende 4" der Bereich ist, der anschließend in die Ausströmöffnung 5 übergeht. In Laufrichtung des Trommelläufers ist das Druckraumende 4" vom Druckraumanfang 4' durch eine Gehäusezunge 6 getrennt.In Fig. 2 is an embodiment of the radial fan according to the invention shown. The radial fan has a housing 3, in which a drum rotor 2 is received. The Housing forms around the drum rotor around a widening Pressure chamber 4, which is essentially spiral extends to the discharge opening 5. The pressure chamber 4 is by definition in a pressure chamber end 4 "and a Pressure chamber 4 'split, the pressure chamber end 4 " the area is, which then into the discharge opening. 5 passes. In the direction of the drum rotor is the Pressure chamber end 4 "from the pressure chamber beginning 4 'through a housing tongue 6 separately.

    Diese Gehäusezunge 6 erstreckt sich bei der dargestellten erfindungsgemäßen Ausbildung in einer der Ausströmöffnung angepaßten Krümmung über die gesamte Breite B des Gehäuses 3.This housing tongue 6 extends in the illustrated inventive design in one of the discharge opening adapted curvature over the entire width B of the housing Third

    Die Zunge ist üblicherweise an ihrem dem Druckraum zugewandten Rand mit einem Zungenradius 8 versehen, der bei Radiallüftern der beschriebenen Gattung, die einen RadDurchmesser in einer Größenordnung von ca. 100 - 150 mm aufweisen, in einer Größenordnung zwischen ca. 5 mm und 8 mm liegt. Bei dem dargestellten Beispiel der Erfindung ist die Zunge derart gestaltet, daß sich der Radius von der Symmetrieebene zu beiden Seiten stetig verringert, wobei der Radius im Mittenbereich vorzugsweise größer als 10 mm bis 15 mm ist und das Maß von 5 mm lediglich in den Randbereichen verwirklicht ist und sogar noch erheblich kleiner sein kann. The tongue is usually facing at its pressure chamber Edge provided with a tongue radius 8, the at Radial fans of the type described, the one RadDurchmesser in the order of about 100-150 mm have, on the order of between about 5 mm and 8 mm is located. In the illustrated example of the invention designed the tongue so that the radius of the Symmetry plane steadily reduced on both sides, taking the radius in the middle region is preferably greater than 10 mm to 15 mm and the measure of 5 mm is only in the border areas is realized and even considerably smaller can be.

    Ein weiteres Kriterium für die Leistungsfähigkeit eines Radiallüfters ist der Abstand zwischen dem Trommelläufer und der Gehäusezunge. Bei der Erfindung kann es vorgesehen sein, daß dieser Abstand über die Gehäusebreite im wesentlichen gleich ist. Dies erfordert eine entsprechend topographische Gestaltung der Gehäuse-Innenwand.Another criterion for the performance of a Radial fan is the distance between the drum rotor and the tongue. It can be provided in the invention be that this distance over the housing width substantially is equal to. This requires a corresponding topographical Design of the housing inner wall.

    Entsprechend den Anforderungen kann der kürzeste Abstand im Bereich der Krümmung liegen, er kann jedoch auch in Laufrichtung nach dem Bereich der Krümmung 7 der Gehäusezunge gelegen sein. Dabei ist ein keilförmiger Raum 10 zwischen der Gehäusezunge und der Stelle des kürzesten Abstands ausgebildet (vgl. Fig. 3). Der Keilwinkel α kann dabei je nach Anforderung variieren.According to the requirements, the shortest distance can lie in the area of curvature, but it can also be in Running direction according to the region of the curvature 7 of the housing tongue be located. In this case, a wedge-shaped space 10 between the housing tongue and the shortest distance location formed (see Fig. 3). The wedge angle α can vary depending on the requirement.

    Bei einer besonders vorteilhaften Ausgestaltung kann durch die Variation der oben beschriebenen Merkmale erreicht werden, daß ein Teil des Fördermediums im Bereich der Gehäusezunge 6 wieder dem Druckraumanfang 4' zugeführt wird. Dabei wird die Trennung von Druckraumende 4" und Druckraumanfang 4' beispielsweise lediglich in den Randzonen des Gebläses verwirklicht, so daß eine undefinierte Rückströmung vermieden wird. Im mittleren axialen Bereich ist ein sanfter Übergang vom Druckraumende in den Druckraumanfang vorgesehen, so daß zum einen die Luftleistung und der Wirkungsgrad erhöht und zum anderen die Geräuschabstrahlung reduziert werden.In a particularly advantageous embodiment can by achieved the variation of the features described above be that part of the fluid in the area of the housing tongue 6 again the pressure space beginning 4 'is supplied. The separation of pressure chamber end 4 "and pressure chamber beginning 4 ', for example, only in the edge zones the blower realized, so that an undefined backflow is avoided. In the middle axial range is a smooth transition from the pressure chamber end into the pressure chamber beginning provided so that on the one hand, the air flow and the Increased efficiency and on the other hand, the noise emission be reduced.

    Claims (6)

    1. Radial fan with a high specific output, comprising a rotor drum (2) and a casing (3) in which around the rotor drum (2) an expanding air space (4) acting as a compression space extends spirally towards an exhaust port (5) having a curved contour, and a casing tab (6) separating the beginning (4') and the end (4") of the compression space provided over at least a part of the width (B) of the casing (3) with a continuous curvature (7), wherein the casing tab (6) has at each of the side walls of the casing a groove radius and the continuous curvature of the casing tab (6) corresponds in its extension to that of the contour of the exhaust port (5), and wherein the casing tab (6) has along the extension of the continuous curvature (7) a substantially continuously changing tab radius (8).
    2. Radial fan as claimed in claim 1, characterized in that the tab radius (8) has its greatest extent in the central portion of the casing width.
    3. Radial fan as claimed in one of the preceding claims, characterized in that the distance between the outer diameter of the rotor drum (2) and the casing tab (6) along the curvature (7) is substantially equal over the casing width (B).
    4. Radial fan as claimed in one of claims 1 to 3, characterized in that the shortest distance between the outer diameter of the rotor drum (2) and the casing (3) lies in the area of the curvature (7).
    5. Radial fan as claimed in one of claims 1 to 4, characterized in that the shortest distance between the outer diameter of the rotor drum (2) and the casing (3) in the direction of rotation lies after the area of the curvature (7) and the casing tab, and that a wedge-shaped space (10) is formed between the tab and the place of the shortest distance.
    6. Radial fan as claimed in one of the preceding claims, characterized in that a part of the conveyed medium in the area of the casing tab (6) is recirculated to the beginning (4') of the compression space.
    EP19990105557 1998-03-18 1999-03-18 Radial fan Expired - Lifetime EP0943808B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE1998111877 DE19811877C2 (en) 1998-03-18 1998-03-18 Radial fan
    DE19811877 1998-03-18

    Publications (3)

    Publication Number Publication Date
    EP0943808A2 EP0943808A2 (en) 1999-09-22
    EP0943808A3 EP0943808A3 (en) 2001-01-31
    EP0943808B1 true EP0943808B1 (en) 2004-06-02

    Family

    ID=7861398

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP19990105557 Expired - Lifetime EP0943808B1 (en) 1998-03-18 1999-03-18 Radial fan

    Country Status (3)

    Country Link
    EP (1) EP0943808B1 (en)
    DE (1) DE19861061C2 (en)
    ES (1) ES2221254T3 (en)

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US7988538B2 (en) 2006-10-13 2011-08-02 Black & Decker Inc. Large angle grinder

    Families Citing this family (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE102008051362A1 (en) * 2008-10-15 2010-04-22 Behr Gmbh & Co. Kg Radial blower housing

    Family Cites Families (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US1152473A (en) * 1912-11-04 1915-09-07 Advance Mfg Co Vacuum-creator.
    IT1025167B (en) * 1974-10-24 1978-08-10 Vortice Elettrosciali S P A SUCTION DEVICE PARTICULARLY FOR DOMESTIC ENVIRONMENTS
    DE8219938U1 (en) * 1982-07-13 1982-09-02 Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co KG, 7000 Stuttgart SPIRAL HOUSING FOR A RADIAL BLOWER
    DE4141590C2 (en) * 1991-12-17 1994-05-11 Hans Kohl Blower for conveying gaseous media
    DE4313617C2 (en) * 1993-04-26 1996-04-25 Kreis Truma Geraetebau Radial fan
    DE19510553A1 (en) * 1995-03-23 1996-09-26 Bosch Gmbh Robert Multi-stage radial fan

    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US7988538B2 (en) 2006-10-13 2011-08-02 Black & Decker Inc. Large angle grinder
    US8388417B2 (en) 2006-10-13 2013-03-05 Black & Decker Inc. Large angle grinder

    Also Published As

    Publication number Publication date
    DE19861061A1 (en) 1999-10-21
    DE19861061C2 (en) 2003-07-03
    EP0943808A3 (en) 2001-01-31
    ES2221254T3 (en) 2004-12-16
    EP0943808A2 (en) 1999-09-22

    Similar Documents

    Publication Publication Date Title
    EP1608875B1 (en) Radial fan wheel, fan unit, and radial fan arrangement
    DE2903369A1 (en) SMALL BLOWER WITH ELECTRIC DRIVE MOTOR
    DE2756800A1 (en) AXIAL FAN WITH AUXILIARY BLADES
    DE3932228A1 (en) TURBOVACUUM PUMP
    DE102012000376A1 (en) Axial or diagonal fan
    DE102013114609A1 (en) Radial impeller for a drum fan and fan unit with such a radial impeller
    EP2333348B1 (en) Radial ventilator housing
    DE2531323A1 (en) ELECTRIC FAN
    DE102015100215B4 (en) Side channel blower for an internal combustion engine
    WO2020015792A1 (en) Ventilator and deflector plate for a ventilator
    EP1757814A1 (en) Centrifugal compressor
    DE19710606B4 (en) Fans, in particular for radiators of internal combustion engines
    EP3592987B1 (en) Half-spiral housing
    DE102009028125A1 (en) Entry geometry for semi-axial fan wheels
    EP3088743B1 (en) Side-channel vacuum pump stage with a stripper that is slanted on the suction side
    EP0233174B1 (en) Heat exchanger system provided with a transverse-flow fan
    EP0943808B1 (en) Radial fan
    EP3256337B1 (en) Rooftop-mounted air-conditioning installation
    DE102005012815A1 (en) Radial blower housing, e.g. for automotive applications, has a flow duct whose size increases radially in a direction between the input wall and the rear side wall
    WO2000058629A1 (en) Side channel compressor
    EP2177769A2 (en) Radial fan casing
    DE19811877C2 (en) Radial fan
    EP1582750B1 (en) Casing and radial blower having a casing and an impeller
    DE102014226341A1 (en) Compressor, exhaust gas turbocharger and internal combustion engine
    DE3439780A1 (en) FAN, IN PARTICULAR PIPE FAN

    Legal Events

    Date Code Title Description
    PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

    Free format text: ORIGINAL CODE: 0009012

    AK Designated contracting states

    Kind code of ref document: A2

    Designated state(s): DE ES FR GB IT

    AX Request for extension of the european patent

    Free format text: AL;LT;LV;MK;RO;SI

    PUAL Search report despatched

    Free format text: ORIGINAL CODE: 0009013

    AK Designated contracting states

    Kind code of ref document: A3

    Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

    AX Request for extension of the european patent

    Free format text: AL;LT;LV;MK;RO;SI

    RIC1 Information provided on ipc code assigned before grant

    Free format text: 7F 04D 29/42 A, 7F 04D 29/66 B

    17P Request for examination filed

    Effective date: 20010704

    AKX Designation fees paid

    Free format text: DE ES FR GB IT

    17Q First examination report despatched

    Effective date: 20021010

    GRAP Despatch of communication of intention to grant a patent

    Free format text: ORIGINAL CODE: EPIDOSNIGR1

    GRAS Grant fee paid

    Free format text: ORIGINAL CODE: EPIDOSNIGR3

    RAP1 Party data changed (applicant data changed or rights of an application transferred)

    Owner name: EBM-PAPST LANDSHUT GMBH

    GRAA (expected) grant

    Free format text: ORIGINAL CODE: 0009210

    AK Designated contracting states

    Kind code of ref document: B1

    Designated state(s): DE ES FR GB IT

    REG Reference to a national code

    Ref country code: GB

    Ref legal event code: FG4D

    Free format text: NOT ENGLISH

    REF Corresponds to:

    Ref document number: 59909622

    Country of ref document: DE

    Date of ref document: 20040708

    Kind code of ref document: P

    GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

    Effective date: 20040915

    REG Reference to a national code

    Ref country code: ES

    Ref legal event code: FG2A

    Ref document number: 2221254

    Country of ref document: ES

    Kind code of ref document: T3

    ET Fr: translation filed
    PLBE No opposition filed within time limit

    Free format text: ORIGINAL CODE: 0009261

    STAA Information on the status of an ep patent application or granted ep patent

    Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

    26N No opposition filed

    Effective date: 20050303

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: GB

    Payment date: 20100322

    Year of fee payment: 12

    GBPC Gb: european patent ceased through non-payment of renewal fee

    Effective date: 20110318

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: GB

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20110318

    REG Reference to a national code

    Ref country code: FR

    Ref legal event code: PLFP

    Year of fee payment: 18

    REG Reference to a national code

    Ref country code: FR

    Ref legal event code: PLFP

    Year of fee payment: 19

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: FR

    Payment date: 20170322

    Year of fee payment: 19

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: ES

    Payment date: 20170315

    Year of fee payment: 19

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: DE

    Payment date: 20170526

    Year of fee payment: 19

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: IT

    Payment date: 20170323

    Year of fee payment: 19

    REG Reference to a national code

    Ref country code: DE

    Ref legal event code: R119

    Ref document number: 59909622

    Country of ref document: DE

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: DE

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20181002

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: IT

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20180318

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: FR

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20180331

    REG Reference to a national code

    Ref country code: ES

    Ref legal event code: FD2A

    Effective date: 20190911

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: ES

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20180319