EP0786597B1 - Radial blower - Google Patents

Radial blower Download PDF

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Publication number
EP0786597B1
EP0786597B1 EP97400163A EP97400163A EP0786597B1 EP 0786597 B1 EP0786597 B1 EP 0786597B1 EP 97400163 A EP97400163 A EP 97400163A EP 97400163 A EP97400163 A EP 97400163A EP 0786597 B1 EP0786597 B1 EP 0786597B1
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EP
European Patent Office
Prior art keywords
fan
fan wheel
circumference
radial
casing
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
EP97400163A
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German (de)
French (fr)
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EP0786597A1 (en
Inventor
Reinhold Hopfensperger
Rudolf Tungl
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Motoren Ventilatoren Landshut GmbH
Original Assignee
Ebm Papst Landshut GmbH
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Publication of EP0786597A1 publication Critical patent/EP0786597A1/en
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    • 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
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • 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

Definitions

  • the invention relates to a radial fan with a housing with spiral outer contour, at least one circular lateral suction port and a tangential exhaust port and a rotatably arranged in the housing and with a Electric motor coupled drum rotor fan, that between the The circumference of the fan wheel and the inner contour of the housing Pressure chamber is formed.
  • Such a radial fan is known (Prospectus: "fan” of Applicant, 1992 edition). This publication is on page 67 a radial blower with the type designation RL 108 described, its housing outside a height of 170 mm and a width of 162.5 mm. The diameter of the fan wheel is 108 mm.
  • a similar radial fan is also known from DE-A-1428055.
  • the well-known radial fan is, for example, in larger Quantities used in gas heaters on the exhaust side. Because the Devices in which these radial blowers are used, one steady evolution, especially in the direction too more compact devices, there is a need for Such radial blowers with higher air power, but unchanged Dimensions.
  • the invention is based technical problem therefore in the creation of such a radial fan. It should the new radial fan about the same fan efficiency and do not cause a higher noise. So it's supposed to be one higher specific power over a wide range of Characteristic, d. H. from 0 to about 80% of the total volume flow exhibit.
  • a radial blower with these features has the same mechanical external dimensions have a higher air flow and a comparable efficiency.
  • a radial fan has a Housing 1 with a spiral outer contour.
  • the housing 1 In the housing 1 is in front of a circular suction that Drum rotor fan 2 is arranged.
  • the Radial fan is the narrowest point x between the circumference the fan wheel 2 and the housing 1 directly to the housing tongue 3, d. H. where the semicircular arc of the housing tongue 3 in the Spiral passes.
  • Starting from the narrowest point x, is in Direction of rotation is a steadily increasing pressure chamber 4, which as a diffuser for the high speed between the Blades 5 exiting flow acts.
  • the distance between the Scope of the fan 2 and the housing 1 at the narrowest point x is to avoid unwanted noise usually at least 4 to 5% of the fan diameter.
  • Fig. 2 illustrates an embodiment of the invention Radial fan.
  • a fan with a larger Diameter If one of the above mentioned Housing dimensions of the known radial blower goes out, which should not be changed, then is the Fan diameter in this embodiment 120 mm. Because the Location of the axial center of the fan wheel, which the position of the Drive shaft and also approximately the center of the circular Einströmdüse corresponds, is not substantially changed, is the Housing spiral in the region of the exhaust opening 6 changed so that the blow-out shaft is shorter. In addition, the narrowest point is x between the periphery of the fan 2 and the housing 1 strong reduced and moved in the direction of rotation of the fan. Before is a to the exhaust opening 6 towards increasing distance in the Type of acute-angled wedge gap 7 present.
  • the embodiment of the radial fan shown in Fig. 3 differs from that in Fig. 2 in that the Housing tongue 3 below the narrowest point x further from the circumference of Fan 2 is bent away, so that the wedge-shaped gap 7 a larger Has angle.
  • Fig. 4 it is illustrated how the blade angle defines ⁇ is.
  • the blade angle ⁇ is between the line 8 from Center point to the circumference of the impeller 2 (radius) and the secant. 9 to the blade 5.
  • Fig. 5 are based on a characteristic comparison, the improved Characteristics of the radial fan according to the invention illustrated.
  • the curves consisting of solid lines are the Characteristics of the radial fan according to the invention; the dashed Lines are the characteristics of the corresponding known Radial fan.
  • d. H the static differential pressure ⁇ P in dependence from the volume flow V and on the other hand, the dependence of the speed n from the volume flow V.
  • the curves show that with the Radial fan according to the invention a higher air flow lower speeds is generated.
  • Fig. 6 shows the plan view of the suction side of the radial fan with the nozzle inlet opening.
  • the nozzle inlet opening centric to the inner circumference of the fan wheel 2, as indicated by the circle 10.
  • the circle has 10 its center at A.
  • the Radial blower according to the invention is the nozzle inlet opening offset radially relative to the inner circumference of the fan 2 arranged as illustrated by the circle 11.
  • the circle has 11 his focus at B.
  • the center B is opposite the center A in the 1st quadrant of the housing 1 after the exhaust opening 6 in the direction of rotation of the Fan wheel 2 arranged offset radially.
  • the distance between the Center points A and B is about 5 to 10% of the Impeller diameter.
  • the eccentric arrangement of the nozzle inlet opening causes a further improvement of air performance.

Description

Die Erfindung betrifft ein Radialgebläse mit einem Gehäuse mit spiralförmiger Außenkontur, wenigstens einer kreisförmigen seitlichen Ansaugöffnung und einer tangentialen Ausblasöffnung sowie einem im Gehäuse derart drehbar angeordneten und mit einem Elektromotor gekuppelten Trommelläufer-Lüfterrad, daß zwischen dem Umfang des Lüfterrades und der Innenkontur des Gehäuses ein Druckraum gebildet ist.The invention relates to a radial fan with a housing with spiral outer contour, at least one circular lateral suction port and a tangential exhaust port and a rotatably arranged in the housing and with a Electric motor coupled drum rotor fan, that between the The circumference of the fan wheel and the inner contour of the housing Pressure chamber is formed.

Ein solches Radialgebläse ist bekannt (Prospekt: "Lüfter" der Anmelderin, Ausgabe 1992). In dieser Druckschrift ist auf Seite 67 ein Radialgebläse mit der Typenbezeichnung RL 108 beschrieben, dessen Gehäuse außen eine Höhe von 170 mm und eine Breite von 162,5 mm aufweist. Der Durchmesser des Lüfterrades beträgt 108 mm.Such a radial fan is known (Prospectus: "fan" of Applicant, 1992 edition). This publication is on page 67 a radial blower with the type designation RL 108 described, its housing outside a height of 170 mm and a width of 162.5 mm. The diameter of the fan wheel is 108 mm.

Ein ähnlicher Radialgebläse ist auch aus DE-A-1428055 bekannt.A similar radial fan is also known from DE-A-1428055.

Das bekannte Radialgebläse wird beispielsweise in größeren Stückzahlen in Gasheizgeräten auf der Abgasseite verwendet. Da die Geräte, bei denen diese Radialgebläse eingesetzt werden, einer stetigen Weiterentwicklung, insbesondere in der Richtung zu kompakteren Geräten, unterworfen sind, besteht ein Bedarf an solchen Radialgebläsen mit höherer Luftleistung, aber unveränderten Abmessungen. The well-known radial fan is, for example, in larger Quantities used in gas heaters on the exhaust side. Because the Devices in which these radial blowers are used, one steady evolution, especially in the direction too more compact devices, there is a need for Such radial blowers with higher air power, but unchanged Dimensions.

Das der Erfindung zugrunde liegende technische Problem besteht deshalb in der Schaffung eines solchen Radialgebläses. Dabei soll das neue Radialgebläse etwa den gleichen Gebläsewirkungsgrad aufweisen und kein höheres Geräusch verursachen. Es soll also eine höhere spezifische Leistung über einem großen Bereich der Kennlinie, d. h. von 0 bis etwa 80 % des Gesamtvolumenstromes aufweisen.The invention is based technical problem therefore in the creation of such a radial fan. It should the new radial fan about the same fan efficiency and do not cause a higher noise. So it's supposed to be one higher specific power over a wide range of Characteristic, d. H. from 0 to about 80% of the total volume flow exhibit.

Dieses technische Problem ist erfindungsgemäß durch die Merkmale der Anspruchs 1 gelöst;

  • a) das Volumen des Druckraumes ist durch Vergrößerung des Lüfterrad-Durchmessers verkleinert,
  • b) der geringste Abstand zwischen dem Umfang des Lüfterrades und der Innenkontur des Gehäuses ist stark verkleinert,
  • c) der Ort des geringsten Abstandes zwischen dem Umfang des Lüfterrades und der Innenkontur des Gehäuses ist gegenüber der Ausblasöffnung in Drehrichtung des Lüfterrades versetzt angeordnet,
  • d) vom Ort des geringsten Abstandes zur Ausblasöffnung hin ist ein sich stetig vergrößernder Abstand zwischen dem Umfang des Lüfterrades und der Gehäuse-Innenkontur in der Art eines Keilspaltes vorhanden,
  • e) das Lüfterrad ist mit sehr flachen Schaufeln bestückt.
    • This technical problem is solved by the features of claim 1;
  • a) the volume of the pressure chamber is reduced by increasing the fan diameter,
  • b) the smallest distance between the circumference of the fan wheel and the inner contour of the housing is greatly reduced,
  • c) the location of the smallest distance between the circumference of the fan wheel and the inner contour of the housing is offset relative to the exhaust opening in the direction of rotation of the fan wheel,
  • d) there is a steadily increasing distance between the circumference of the fan wheel and the housing inner contour in the manner of a wedge gap from the location of the smallest distance to the exhaust opening,
  • e) the fan wheel is equipped with very flat blades.

    • Ein Radialgebläse mit diesen Merkmalen besitzt bei gleichen mechanischen Außenabmessungen eine höhere Luftleistung und einen vergleichbaren Wirkungsgrad. A radial blower with these features has the same mechanical external dimensions have a higher air flow and a comparable efficiency.

    Vorteilhafte Einzelheiten der Erfindung sind in den Ansprüchen 2 bis 5 enthalten. Sie ist nachstehend anhand der Figuren 1 bis 6 erläutert. Es zeigen:

    Fig. 1
    den Querschnitt des bekannten Radialgebläses,
    Fig. 2
    den Querschnitt eines Ausführungsbeispieles des erfindungsgemäßen Radialgebläses,
    Fig. 3
    eine Abänderung des Radialgebläses gemäß Fig. 2,
    Fig. 4
    die Definition des Schaufelwinkels,
    Fig. 5
    die Kennlinie eines Ausführungsbeispiels des erfindungsgemäßen Radialgebläses im Vergleich zu einem bekannten Radialgebläse und
    Fig. 6
    die Anordnung der Einströmöffnung bei einem Ausführungsbeispiel des Radialgebläses.
    Advantageous details of the invention are contained in claims 2 to 5. It is explained below with reference to Figures 1 to 6. Show it:
    Fig. 1
    the cross section of the known radial fan,
    Fig. 2
    the cross section of an embodiment of the radial fan according to the invention,
    Fig. 3
    a modification of the radial fan of FIG. 2,
    Fig. 4
    the definition of the blade angle,
    Fig. 5
    the characteristic of an embodiment of the radial blower according to the invention in comparison to a known radial fan and
    Fig. 6
    the arrangement of the inflow opening in an embodiment of the radial fan.

    Wie aus Fig. 1 zu erkennen ist, besitzt ein Radialgebläse ein Gehäuse 1 mit einer spiralförmigen Außenkontur. In dem Gehäuse 1 ist vor einer kreisförmigen Ansaugöffnung das Trommelläufer-Lüfterrad 2 angeordnet. Bei dem bekannten Radialgebläse befindet sich die engste Stelle x zwischen dem Umfang des Lüfterrades 2 und dem Gehäuse 1 direkt an der Gehäusezunge 3, d. h. dort, wo der halbkreisförmige Bogen der Gehäusezunge 3 in die Spirale übergeht. Von der engsten Stelle x ausgehend, ist in Drehrichtung ein sich stetig vergrößernder Druckraum 4 vorhanden, welcher als Diffusor für die mit hoher Geschwindigkeit zwischen den Schaufeln 5 austretenden Strömung wirkt. Der Abstand zwischen dem Umfang des Lüfterrades 2 und dem Gehäuse 1 an der engsten Stelle x beträgt zwecks Vermeidung von unerwünschten Geräuschen überlicherweise mindestens 4 bis 5 % des Lüfterrad-Durchmessers. As can be seen from Fig. 1, a radial fan has a Housing 1 with a spiral outer contour. In the housing 1 is in front of a circular suction that Drum rotor fan 2 is arranged. In the known Radial fan is the narrowest point x between the circumference the fan wheel 2 and the housing 1 directly to the housing tongue 3, d. H. where the semicircular arc of the housing tongue 3 in the Spiral passes. Starting from the narrowest point x, is in Direction of rotation is a steadily increasing pressure chamber 4, which as a diffuser for the high speed between the Blades 5 exiting flow acts. The distance between the Scope of the fan 2 and the housing 1 at the narrowest point x is to avoid unwanted noise usually at least 4 to 5% of the fan diameter.

    Fig. 2 verdeutlicht ein Ausführungsbeispiel des erfindungsgemäßen Radialgebläses. Im Vergleich zum Radialgebläse gemäß Fig. 1 besitzt das in Fig. 2 gezeigte Radialgebläse ein Lüfterrad mit größerem Durchmesser. Wenn man von den vorstehend erwähnten Gehäuseabmessungen des bekannten Radialgebläses ausgeht, welche nicht verändert werden sollen, dann beträgt der Lüfterrad-Durchmesser bei diesem Ausführungsbeispiel 120 mm. Da die Lage der Achsmitte des Lüfterrades, welche der Lage der Antriebswelle und auch in etwa dem Zentrum der kreisförmigen Einströmdüse entspricht, nicht wesentlich verändert ist, ist die Gehäusespirale im Bereich der Ausblasöffnung 6 derart verändert, daß der Ausblasschacht kürzer ist. Außerdem ist die engste Stelle x zwischen dem Umfang des Lüfterrades 2 und dem Gehäuse 1 stark verkleinert und in Drehrichtung des Lüfterrades verschoben. Davor ist ein sich zur Ausblasöffnung 6 hin vergrößernder Abstand in der Art eines spitzwinkligen Keilspaltes 7 vorhanden.Fig. 2 illustrates an embodiment of the invention Radial fan. Compared to the radial fan of FIG. 1 has the radial fan shown in Fig. 2, a fan with a larger Diameter. If one of the above mentioned Housing dimensions of the known radial blower goes out, which should not be changed, then is the Fan diameter in this embodiment 120 mm. Because the Location of the axial center of the fan wheel, which the position of the Drive shaft and also approximately the center of the circular Einströmdüse corresponds, is not substantially changed, is the Housing spiral in the region of the exhaust opening 6 changed so that the blow-out shaft is shorter. In addition, the narrowest point is x between the periphery of the fan 2 and the housing 1 strong reduced and moved in the direction of rotation of the fan. Before is a to the exhaust opening 6 towards increasing distance in the Type of acute-angled wedge gap 7 present.

    Die in Fig. 3 gezeigte Ausführungsform des Radialgebläses unterscheidet sich von derjenigen in Fig. 2 dadurch, daß die Gehäusezunge 3 unterhalb der engsten Stelle x weiter vom Umfang des Lüfterrades 2 weggebogen ist, so daß der Keilspalt 7 einen größeren Winkel aufweist.The embodiment of the radial fan shown in Fig. 3 differs from that in Fig. 2 in that the Housing tongue 3 below the narrowest point x further from the circumference of Fan 2 is bent away, so that the wedge-shaped gap 7 a larger Has angle.

    In Fig. 4 ist verdeutlicht, wie der Schaufelwinkel α definiert ist. Der Schaufelwinkel α liegt zwischen der Linie 8 vom Mittelpunkt zum Umfang des Lüfterrades 2 (Radius) und der Sekante 9 an die Schaufel 5. In Fig. 4 it is illustrated how the blade angle defines α is. The blade angle α is between the line 8 from Center point to the circumference of the impeller 2 (radius) and the secant. 9 to the blade 5.

    In Fig. 5 sind anhand eines Kennlinien-Vergleichs die verbesserten Eigenschaften des erfindungsgemäßen Radialgebläses verdeutlicht. Die aus durchgezogenen Linien bestehenden Kennlinien sind die Kennlinien des erfindungsgemäßen Radialgebläses; die strichlierten Linien sind die Kennlinien des entsprechenden bekannten Radialgebläses. Es sind einerseits die Druck-Volumen-Kennlinien gezeigt, d. h. der statische Differenzdruck ΔP in Abhängigkeit vom Volumenstrom V und andererseits die Abhängigkeit der Drehzahl n vom Volumenstrom V. Die Kennlinien zeigen, daß mit dem erfindungsgemäßen Radialgebläse eine höhere Luftleistung bei niedrigeren Drehzahlen erzeugt wird.In Fig. 5 are based on a characteristic comparison, the improved Characteristics of the radial fan according to the invention illustrated. The curves consisting of solid lines are the Characteristics of the radial fan according to the invention; the dashed Lines are the characteristics of the corresponding known Radial fan. On the one hand, there are the pressure-volume characteristics shown, d. H. the static differential pressure ΔP in dependence from the volume flow V and on the other hand, the dependence of the speed n from the volume flow V. The curves show that with the Radial fan according to the invention a higher air flow lower speeds is generated.

    Fig. 6 zeigt die Draufsicht auf die Ansaugseite des Radialgebläses mit der Düsen-Einströmöffnung. Bei dem bekannten Radialgebläse ist die Düsen-Einströmöffnung zentrisch zum Innenumfang des Lüfterrades 2 angeordnet, wie durch den Kreis 10 verdeutlicht. Der Kreis 10 hat seinen Mittelpunkt bei A. Gemäß einem Ausführungsbeispiel des erfindungsgemäßen Radialgebläses ist die Düsen-Eintrömöffnung radial gegenüber dem Innenumfang des Lüfterrades 2 versetzt angeordnet, wie durch den Kreis 11 verdeutlicht. Der Kreis 11 hat seinen Mittelpunkt bei B.Fig. 6 shows the plan view of the suction side of the radial fan with the nozzle inlet opening. In the known radial fan is the nozzle inlet opening centric to the inner circumference of the fan wheel 2, as indicated by the circle 10. The circle has 10 its center at A. According to an embodiment of the Radial blower according to the invention is the nozzle inlet opening offset radially relative to the inner circumference of the fan 2 arranged as illustrated by the circle 11. The circle has 11 his focus at B.

    Der Mittelpunkt B ist gegenüber dem Mittelpunkt A im 1. Quadranten des Gehäuses 1 nach der Ausblasöffnung 6 in Drehrichtung des Lüfterrades 2 radial versetzt angeordnet. Der Abstand zwischen den Mittelpunkten A und B beträgt etwa 5 bis 10 % des Lüfterrad-Durchmessers.The center B is opposite the center A in the 1st quadrant of the housing 1 after the exhaust opening 6 in the direction of rotation of the Fan wheel 2 arranged offset radially. The distance between the Center points A and B is about 5 to 10% of the Impeller diameter.

    Die exzentrische Anordnung der Düsen-Einströmöffnung bewirkt eine weitere Verbesserung der Luftleistung.The eccentric arrangement of the nozzle inlet opening causes a further improvement of air performance.

    Claims (4)

    1. Radial fan with a casing (1) having a spiral-shaped outer contour, at least one circular side intake port and a tangential exhaust port (6) as well as a rotor drum fan wheel (2) coupled with an electric motor and arranged rotatably in such a way that between the circumference of the fan wheel and the inner contour of the casing a compression space (4) is formed, characterized by a combination of the following features:
      the relation fan wheel diameter/height of the interior spiral of the casing is 70% - 80%
      the blade angle is between 34 and 45 degrees of angle
      the minimum distance (x) between the circumference of the fan wheel and the inner contour of the casing is between 1% - 5% of the fan wheel diameter.
    2. Radial fan as claimed in claim 1, wherein a continuously increasing distance in the manner of a wedge-shaped gap (7) between the circumference of the fan wheel (2) and the inner contour of the casing is present from the location of minimum distance (x) to the exhaust port (6), characterized in that the wedge-shaped gap (7) has a dimension of up to 30 degrees of angle.
    3. Radial fan as claimed in claim 1 or 2, characterized in that the intake port of the radial fan is arranged excentrically with respect to the inner circumference of the fan wheel (2).
    4. Radial fan as claimed in one of the preceding claims, characterized in that the location of minimum distance (x) between the circumference of the fan wheel (2) and the inner contour of the casing (1) is offset with respect to the exhaust port in the direction of rotation of the fan wheel (2).
    EP97400163A 1996-01-24 1997-01-24 Radial blower Expired - Lifetime EP0786597B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19602368A DE19602368A1 (en) 1996-01-24 1996-01-24 Radial fan
    DE19602368 1996-01-24

    Publications (2)

    Publication Number Publication Date
    EP0786597A1 EP0786597A1 (en) 1997-07-30
    EP0786597B1 true EP0786597B1 (en) 2005-03-30

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97400163A Expired - Lifetime EP0786597B1 (en) 1996-01-24 1997-01-24 Radial blower

    Country Status (3)

    Country Link
    US (1) US5813834A (en)
    EP (1) EP0786597B1 (en)
    DE (2) DE19602368A1 (en)

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    Cited By (1)

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    Publication number Priority date Publication date Assignee Title
    CN103967842A (en) * 2014-04-02 2014-08-06 华北电力大学（保定） Method for designing volute radius of centrifugal fan based on variable working conditions

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    DE19602368A1 (en) 1997-07-31
    DE59712252D1 (en) 2005-05-04
    US5813834A (en) 1998-09-29
    EP0786597A1 (en) 1997-07-30

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