EP3524823B1 - Radial fan with motor cooling - Google Patents

Radial fan with motor cooling Download PDF

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Publication number
EP3524823B1
EP3524823B1 EP19152593.0A EP19152593A EP3524823B1 EP 3524823 B1 EP3524823 B1 EP 3524823B1 EP 19152593 A EP19152593 A EP 19152593A EP 3524823 B1 EP3524823 B1 EP 3524823B1
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EP
European Patent Office
Prior art keywords
motor housing
motor
radial fan
radial
cooling air
Prior art date
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Application number
EP19152593.0A
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German (de)
French (fr)
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EP3524823A1 (en
Inventor
Dr.-Ing. Daniel WOLFRAM
Fabian Schmelz
Joachim Krafft
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DLK Ventilatoren GmbH
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DLK Ventilatoren GmbH
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Publication of EP3524823A1 publication Critical patent/EP3524823A1/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
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
    • F04D29/5853—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps heat insulation or conduction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/02—Roof ventilation
    • F24F7/025—Roof ventilation with forced air circulation by means of a built-in ventilator
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/33—Responding to malfunctions or emergencies to fire, excessive heat or smoke

Definitions

  • the present invention relates to a radial fan according to the preamble of claim 1.
  • Common radial fans, in particular flue gas fans - mostly roof fans - are generally cooled by means of cooling air supplied to their drive motor, the motors of the fans being thermally insulated from the pumped gas in a complex manner using insulating layers surrounding their motor housing. This protects the motors from overheating. Care must also be taken to prevent smoke gas from entering the motor housing and the interior of the motor. Sheet metal components can warp due to high thermal loads.
  • the document DE 85 17 964 U1 discloses a thermally protected flue gas fan.
  • the invention has for its object to propose a radial fan in which the disadvantages known from the prior art are avoided or at least greatly reduced.
  • the core of the invention is a temperature control in roof fans by air convection.
  • Air is a very good heat insulator (this is also used in residential construction, for example).
  • a number of advantages can be achieved by using the double wall system. Sheet deformations of the inner wall of the motor housing due to overheating are minimized by cooling convection air.
  • the double-walled motor housing and cooling air duct form a convection chamber during operation of the radial fan, in which negative pressure prevails during operation.
  • This has the further advantage that false air (e.g. flue gases) in the convection chamber is prevented due to the negative pressure.
  • false air e.g. flue gases
  • the ingress of smoke gases into the engine interior due to the negative pressure in the convection chamber is avoided. Additional insulation can advantageously be omitted.
  • the radial fan is designed such that the back blading is formed by means of radial blades, in particular circular arc blades, which are partially inserted through the base plate. This represents an advantageous simplification of the design and the production. It is thereby possible to optimally use the back blading on the impeller.
  • the radial fan is designed in such a way that baffles are arranged around the motor housing for controlling a targeted air flow.
  • baffles are arranged around the motor housing for controlling a targeted air flow.
  • the radial fan is designed in such a way that the guide plates are fixed with respect to the motor housing with the aid of stiffening plates. This advantageously enables the stability of the radial fan and its guide plates to be increased.
  • the radial fan can be stiffened.
  • the radial fan is designed such that the motor housing, the cooling air duct and the convection duct are designed as riveted sheet metal structures. This advantageously results in the possibility of simple and inexpensive production.
  • the radial fan is designed such that the radial blades are welded to the bottom disk of the impeller. This means, for example, using welding robots, that reliable repeatability can be achieved with a very stable design.
  • Fig. 1 shows an embodiment of a fan housing 5 for a radial fan 1, in which a cut open motor housing 2 can be seen, which in turn surrounds a cut motor 4 shown.
  • the motor 4 is attached to a motor plate 3 and penetrates the latter with its drive shaft 9 approximately in the middle.
  • the drive shaft 9 is connected to the base plate 12 of an impeller 8 via a hub.
  • the base plate 12 carries a plurality of radial blades 16, each with a (in 1 to 3 approach) penetrate the base plate 12 and above it as back blading 14 (see also Fig. 3 ) can be recognized.
  • the motor plate 3 is connected to a base plate 7 of the fan housing 5, on which the fan inlet 13 opening into the impeller 8 for the conveyed medium, e.g. B. flue gas is arranged.
  • the conveyed medium e.g. B. flue gas
  • Fig. 2 is now based on some arrows 22, 24, 26 and 28, the local flow direction of the medium of the radial fan according to the invention, z. B. flue gas is shown.
  • air this is simply referred to as "air" for simplification.
  • air drawn in by the radial fan 1 according to the invention enters the impeller 8 via the fan inlet 13 and is sucked there radially outwards into the interior of the fan housing 5 according to the arrows 26 as a result of the force generated by the radial blades 16 of the rotating impeller 8 .
  • the air flows further deflected upwards, follows the direction of the arrows 22 and finally leaves the fan housing 5 via an outlet designed as a grille opening 15 upwards.
  • the engine 4 is cooled by means of a cooling air brought up in the cooling air duct 6.
  • the cooling air flows along the directional arrows 32 into the motor housing 2 and cools around the motor 4.
  • the air flows through an annular opening around the drive shaft 9 through the motor plate 3 out of the motor housing 2 into the space between the motor plate 3 and bottom plate 12 of the impeller 8.
  • There the now slightly warmed cooling air mixes with the convection air.
  • the latter flows for cooling the motor housing 2 and the cooling air through the convection duct 10, which surrounds the cooling air duct 6 and the motor housing 2, in the direction of the arrows 30.
  • FIG. 3 To illustrate the position of the back blading 14 is in Fig. 3 in a schematic representation a front view of a section of the Fig. 2 shown, the position of the back blading in the region of the bottom disk of the impeller is shown.
  • the radial blade 16a is clearly visible on the right-hand side of Fig. 3 , where it is shown penetrating the base plate 12, wherein it appears above the base plate 12 as a back vane 14a.
  • the "large” impeller 8 which, by means of its radial blades 16, conveys the conveying air flowing in via the fan inlet 13 through the radial fan 1 and the "small” impeller, which consists of the base plate 12 and the back blading 14 and the above-mentioned.
  • the "large” impeller 8 which, by means of its radial blades 16, conveys the conveying air flowing in via the fan inlet 13 through the radial fan 1 and the "small” impeller, which consists of the base plate 12 and the back blading 14 and the above-mentioned.
  • Mixed air from convection air and cooling air in the direction of arrows 34 promotes.
  • Baffles 18 seated on the motor plate 3 take over the control of the air flow explained in more detail above, in particular in the lower region of the motor housing 2. Their position and the position of the stiffening plates 20 supporting the baffle plates 18 are shown in all three figures.
  • FIG. 3 shown components, which are already in Fig. 1 and Fig. 2nd have been described in connection with the Fig. 3 no longer mentioned, since they are easy to explain from the context.

Description

Die vorliegende Erfindung betrifft einen Radialventilator gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a radial fan according to the preamble of claim 1.

Gängige Radialventilatoren, insbesondere Rauchgasventilatoren - zumeist Dachventilatoren - werden in der Regel mittels ihrem Antriebsmotor zugeleiteter Kühlluft gekühlt, wobei die Motoren der Ventilatoren mittels deren Motorgehäuse umgebende Isolierungsschichten gegenüber dem geförderten Gas aufwändig thermisch isoliert werden. Dadurch werden die Motoren vor Überhitzung geschützt. Es ist auch dafür zu sorgen, dass ein Eindringen von Rauchgas in das Motorgehäuse sowie den Motorinnenraum verhindert wird. Blechbauteile können sich aufgrund hoher thermischer Belastung verziehen. Ein Dachventilator, als Brandgasventilator der Temperaturklasse F600 benötigt stets eine Isolierung um bzw. für den Motor. Eine solche Isolierung, sie kann eine mineralische oder keramische Basis haben, ist teuer.Common radial fans, in particular flue gas fans - mostly roof fans - are generally cooled by means of cooling air supplied to their drive motor, the motors of the fans being thermally insulated from the pumped gas in a complex manner using insulating layers surrounding their motor housing. This protects the motors from overheating. Care must also be taken to prevent smoke gas from entering the motor housing and the interior of the motor. Sheet metal components can warp due to high thermal loads. A roof fan, as a fire gas fan of temperature class F600, always requires insulation around or for the motor. Such insulation, which can have a mineral or ceramic base, is expensive.

Das Dokument DE 85 17 964 U1 offenbart einen thermisch geschützten Rauchgasventilator.The document DE 85 17 964 U1 discloses a thermally protected flue gas fan.

Der Erfindung liegt die Aufgabe zugrunde, einen Radialventilator vorzuschlagen, bei welchem die aus dem Stand der Technik bekannten Nachteile vermieden oder doch zumindest stark vermindert sind.The invention has for its object to propose a radial fan in which the disadvantages known from the prior art are avoided or at least greatly reduced.

Die Aufgabe wird gelöst mit einem Radialventilator gemäß Anspruch 1, nämlich einem Radialventilator, insbesondere Dachventilator, welcher folgende Merkmale aufweist:

  1. a) ein Motorgehäuse,
  2. b) einen auf einer am Boden des Motorgehäuses angeordneten Motorplatte montierten Motor,
  3. c) ein mit dem Motor drehfest verbundenes außerhalb des Motorgehäuses angeordneten Laufrad,
  4. d) einen in das Motorgehäuse mündenden Kühlluftkanal, wobei
  5. e) das Motorgehäuse und der Kühlluftkanal derart doppelwandig ausgebildet sind, dass ein diese ummantelnder Konvektionskanal gebildet wird, und dass
  6. f) das Laufrad eine Bodenscheibe mit einer zum Motorgehäuse zeigenden Rückenbeschaufelung aufweist, wodurch eine Einrichtung zur radialen Ableitung von Kühlluft und Konvektionsluft gebildet wird.
The object is achieved with a radial fan according to claim 1, namely a radial fan, in particular a roof fan, which has the following features:
  1. a) a motor housing,
  2. b) a motor mounted on a motor plate arranged on the bottom of the motor housing,
  3. c) an impeller which is connected in a rotationally fixed manner to the motor and is arranged outside the motor housing,
  4. d) a cooling air duct opening into the motor housing, wherein
  5. e) the motor housing and the cooling air duct are double-walled in such a way that a convection duct encasing them is formed, and that
  6. f) the impeller has a base plate with a back blading pointing towards the motor housing, as a result of which a device for the radial discharge of cooling air and convection air is formed.

Mit der erfindungsgemäßen Ausbildung des Radialventilators ist es möglich, anstatt eine herkömmliche Isolierung zu verwenden, neben der bestehenden Luftkonvektion zusätzlich die Luft in Konvektion im Doppelwandprinzip einzusetzen, um den Motor vor Überhitzung zu schützen. Im Bereich Dachventilator F400/600 ist diese Anwendung völlig neu. Es geht erfindungsgemäß im Kern um eine Temperaturregelung bei Dachventilatoren per Luftkonvektion. Die Vorteile der Luftkonvektion sind bekannt. Luft ist ein sehr guter Wärmeisolator (Dies wird sich z.B. auch im Wohnungsbau zunutze gemacht). Mit dem erfindungsgemäßen Radialventilator lassen sich durch Verwendung des Doppelwandsystems eine Reihe von Vorteilen erreichen. So werden aufgrund von Überhitzung entstehende Blechdeformierungen der Innenwand des Motorgehäuses durch kühlende Konvektionsluft minimiert. Erfindungsgemäß doppelwandig ausgebildete Motorgehäuse und Kühlluftkanal bilden im Betrieb des Radialventilators eine Konvektionskammer, in welcher im Betrieb Unterdruck herrscht. Dadurch ergibt sich der weitere Vorteil, dass Falschluft (z. B. Rauchgase) in der Konvektionskammer aufgrund des Unterdrucks verhindert wird. Es wird ein Eindringen von Rauchgasen in den Motorinnenraum durch den Unterdruck in der Konvektionskammer vermieden. Eine zusätzliche Isolierung kann vorteilhafterweise entfallen.With the design of the radial fan according to the invention, it is possible to use the air in convection in addition to the existing air convection in addition to the existing air convection in addition to the conventional double wall principle, in order to protect the motor against overheating. This application is completely new in the area of the roof fan F400 / 600. The core of the invention is a temperature control in roof fans by air convection. The advantages of air convection are well known. Air is a very good heat insulator (this is also used in residential construction, for example). With the radial fan according to the invention, a number of advantages can be achieved by using the double wall system. Sheet deformations of the inner wall of the motor housing due to overheating are minimized by cooling convection air. According to the invention, the double-walled motor housing and cooling air duct form a convection chamber during operation of the radial fan, in which negative pressure prevails during operation. This has the further advantage that false air (e.g. flue gases) in the convection chamber is prevented due to the negative pressure. The ingress of smoke gases into the engine interior due to the negative pressure in the convection chamber is avoided. Additional insulation can advantageously be omitted.

In einer vorteilhaften Ausbildung der Erfindung ist der Radialventilator derart ausgebildet, dass die Rückenbeschaufelung mittels teilweise durch die Bodenscheibe gesteckter Radialschaufeln, insbesondere Kreisbogenschaufeln gebildet wird. Dies stellt eine vorteilhafte Vereinfachung der Konstruktion sowie der Herstellung dar. Es ist dadurch eine optimale Nutzung der Rückenbeschaufelung am Laufrad möglich.In an advantageous embodiment of the invention, the radial fan is designed such that the back blading is formed by means of radial blades, in particular circular arc blades, which are partially inserted through the base plate. This represents an advantageous simplification of the design and the production. It is thereby possible to optimally use the back blading on the impeller.

In einer weiteren vorteilhaften Ausbildung der Erfindung ist der Radialventilator derart ausgebildet, dass um das Motorgehäuse herum Leitbleche zur Steuerung einer gezielten Luftführung angeordnet sind. Hierdurch lassen sich vorteilhafterweise interne Druckverluste vermindern und damit auch der Wirkungsgrad einer Radialventilator-Anordnung erhöhen. Dazu gehören eine mögliche Reduzierung von Strömungsverlusten, zum Teil auch Strömungsturbulenzen und eine dadurch mögliche Reduzierung der erforderlichen Motorleistung für den Radialventilator, was wirtschaftliche Vorteile zur Folge hat.In a further advantageous embodiment of the invention, the radial fan is designed in such a way that baffles are arranged around the motor housing for controlling a targeted air flow. This advantageously allows internal Reduce pressure losses and thus also increase the efficiency of a radial fan arrangement. This includes a possible reduction in flow losses, in some cases also flow turbulence, and a possible reduction in the motor power required for the radial fan, which has economic advantages.

In noch einer weiteren vorteilhaften Ausbildung der Erfindung ist der Radialventilator derart ausgebildet, dass die Leitbleche mit Hilfe von Versteifungsblechen gegenüber dem Motorgehäuse fixiert sind. Dies ermöglicht vorteilhafterweise eine Erhöhung der Stabilität des Radialventilators sowie seiner Leitbleche. Es lässt sich eine Versteifung des Radialventilators erreichen.In yet another advantageous embodiment of the invention, the radial fan is designed in such a way that the guide plates are fixed with respect to the motor housing with the aid of stiffening plates. This advantageously enables the stability of the radial fan and its guide plates to be increased. The radial fan can be stiffened.

In wieder einer weiteren vorteilhaften Ausbildung der Erfindung ist der Radialventilator derart ausgebildet, dass das Motorgehäuse, der Kühlluftkanal und der Konvektionskanal als vernietete Blechkonstruktion ausgebildet sind. Es ergibt sich hiermit vorteilhafterweise die Möglichkeit einer einfachen und kostengünstigen Herstellung.In yet another advantageous embodiment of the invention, the radial fan is designed such that the motor housing, the cooling air duct and the convection duct are designed as riveted sheet metal structures. This advantageously results in the possibility of simple and inexpensive production.

In noch einer weiteren vorteilhaften Ausbildung der Erfindung ist der Radialventilator derart ausgebildet, dass die Radialschaufeln mit der Bodenscheibe des Laufrads verschweißt sind. Damit lässt sich, beispielsweise über Schweißroboter ausgeführt, eine sichere Wiederholgenauigkeit bei sehr stabiler Bauweise erreichen.In yet another advantageous embodiment of the invention, the radial fan is designed such that the radial blades are welded to the bottom disk of the impeller. This means, for example, using welding robots, that reliable repeatability can be achieved with a very stable design.

Zum besseren Verständnis der Erfindung wird diese anhand eines Ausführungsbeispiels unter Zuhilfenahme einer Zeichnung im Folgenden kurz erläutert.

Fig. 1
zeigt in einer schematischen Perspektivansicht im Schnittbild ein Beispiel eines erfindungsgemäßen Radialventilators mit Angabe der Strömungssituation von Kühlluft und Konvektionsluft.
Fig. 2
zeigt in einer schematischen Perspektivansicht die Situation gemäß Fig. 1, jedoch bei nicht aufgeschnittenem Motorgehäuse.
Fig. 3
zeigt in einer schematischen Darstellung eine Frontansicht eines Ausschnitts der Fig. 2, wobei die Lage der Rückenbeschaufelung im Bereich der Bodenscheibe des Laufrads dargestellt ist.
For a better understanding of the invention, this will be briefly explained below using an exemplary embodiment with the aid of a drawing.
Fig. 1
shows in a schematic perspective view in a sectional view an example of a radial fan according to the invention with details of the flow situation of cooling air and convection air.
Fig. 2
shows the situation in a schematic perspective view Fig. 1 , but with the motor housing not cut open.
Fig. 3
shows a schematic representation of a front view of a section of FIG Fig. 2 , the position of the back blading is shown in the area of the bottom disk of the impeller.

Fig. 1 zeigt ein Ausführungsbeispiel eines Ventilatorgehäuses 5 für einen Radialventilator 1, in welchem ein aufgeschnitten dargestelltes Motorgehäuse 2 zu erkennen ist, welches wiederum einen aufgeschnitten dargestellten Motor 4 umgibt. Der Motor 4 ist auf einer Motorplatte 3 befestigt und durchdringt letztere mit seiner Antriebswelle 9 etwa mittig. Die Antriebswelle 9 ist über eine Nabe mit der Bodenscheibe 12 eines Laufrads 8 verbunden. Die Bodenscheibe 12 trägt mehrere Radialschaufeln 16, welche jeweils mit einem (in Fig. 1 bis 3 oben befindlichen) Ansatz die Bodenscheibe 12 durchdringen und darüber als Rückenbeschaufelung 14 (siehe auch Fig. 3) zu erkennen sind. Über Seitenwände 11 wird die Motorplatte 3 mit einer Grundplatte 7 des Ventilatorgehäuses 5 verbunden, auf welcher auch der in das Laufrad 8 mündende Ventilatoreinlass 13 für das geförderte Medium, z. B. Rauchgas angeordnet ist. Fig. 1 shows an embodiment of a fan housing 5 for a radial fan 1, in which a cut open motor housing 2 can be seen, which in turn surrounds a cut motor 4 shown. The motor 4 is attached to a motor plate 3 and penetrates the latter with its drive shaft 9 approximately in the middle. The drive shaft 9 is connected to the base plate 12 of an impeller 8 via a hub. The base plate 12 carries a plurality of radial blades 16, each with a (in 1 to 3 approach) penetrate the base plate 12 and above it as back blading 14 (see also Fig. 3 ) can be recognized. Via side walls 11, the motor plate 3 is connected to a base plate 7 of the fan housing 5, on which the fan inlet 13 opening into the impeller 8 for the conveyed medium, e.g. B. flue gas is arranged.

In Fig. 2 ist nun anhand einiger Pfeile 22, 24, 26 und 28 die örtliche Strömungsrichtung des Fördermediums des erfindungsgemäßen Radialventilators, z. B. Rauchgas dargestellt. Im Folgenden wird dieses zur Vereinfachung schlicht mit "Luft" bezeichnet. Gemäß den Pfeilen 28 gelangt von dem erfindungsgemäßen Radialventilator 1 angesaugte Luft über den Ventilatoreinlass 13 in das Laufrad 8 und wird dort infolge der durch die Radialschaufeln 16 des sich drehenden Laufrads 8 erzeugten Kraft gemäß den Pfeilen 26 radial nach außen in das Innere des Ventilatorgehäuses 5 gesaugt. Gemäß den Pfeilen 24 fließt die Luft nach oben abgelenkt weiter, folgt der Richtung der Pfeile 22 und verlässt schließlich das Ventilatorgehäuse 5 über einen als Gitteröffnung 15 gestalteten Ausgang nach oben.In Fig. 2 is now based on some arrows 22, 24, 26 and 28, the local flow direction of the medium of the radial fan according to the invention, z. B. flue gas is shown. In the following, this is simply referred to as "air" for simplification. According to the arrows 28, air drawn in by the radial fan 1 according to the invention enters the impeller 8 via the fan inlet 13 and is sucked there radially outwards into the interior of the fan housing 5 according to the arrows 26 as a result of the force generated by the radial blades 16 of the rotating impeller 8 . According to the arrows 24, the air flows further deflected upwards, follows the direction of the arrows 22 and finally leaves the fan housing 5 via an outlet designed as a grille opening 15 upwards.

Der Motor 4 wird mittels über einen im Kühlluftkanal 6 herangeführte Kühlluft gekühlt. Die Kühlluft strömt entlang den Richtungspfeilen 32 in das Motorengehäuse 2 und umstreicht kühlend den Motor 4. Am unteren Ende des Motorgehäuses 2 strömt die Luft durch eine um die Antriebswelle 9 liegende ringförmige Öffnung durch die Motorplatte 3 aus dem Motorengehäuse 2 in den Zwischenraum zwischen Motorplatte 3 und Bodenscheibe 12 des Laufrads 8. Dort mischt sich die nun etwas angewärmte Kühlluft mit der Konvektionsluft. Letztere strömt zur Kühlung des Motorgehäuses 2 und der Kühlluft durch den Konvektionskanal 10, welcher jeweils den Kühlluftkanal 6 und das Motorgehäuse 2 umgibt, in Richtung der Pfeile 30. Sie fließt weiter gemäß dem Pfeil 34 radial nach außen, wo sie sich mit der Förderluft mischt und über die Gitteröffnung 15 nach oben entweicht. Die Förderung der Mischluft aus Konvektionsluft und Kühlluft in Richtung der Pfeile 34 wird durch die Rückenbeschaufelung 14 unterstützt.The engine 4 is cooled by means of a cooling air brought up in the cooling air duct 6. The cooling air flows along the directional arrows 32 into the motor housing 2 and cools around the motor 4. At the lower end of the motor housing 2, the air flows through an annular opening around the drive shaft 9 through the motor plate 3 out of the motor housing 2 into the space between the motor plate 3 and bottom plate 12 of the impeller 8. There the now slightly warmed cooling air mixes with the convection air. The latter flows for cooling the motor housing 2 and the cooling air through the convection duct 10, which surrounds the cooling air duct 6 and the motor housing 2, in the direction of the arrows 30. It continues to flow radially outwards according to the arrow 34, where it mixes with the conveying air and escapes upwards through the grating opening 15. The promotion of the mixed air from convection air and cooling air in the direction of arrows 34 is supported by the back blading 14.

Zur Verdeutlichung der Lage der Rückenbeschaufelung 14 wird in Fig. 3 in einer schematischen Darstellung eine Frontansicht eines Ausschnitts der Fig. 2 gezeigt, wobei die Lage der Rückenbeschaufelung im Bereich der Bodenscheibe des Laufrads dargestellt ist. Gut zu erkennen ist die Radialschaufel 16a auf der rechten Seite von Fig. 3, wo sie die Bodenscheibe 12 durchdringend gezeigt ist, wobei sie oberhalb der Bodenscheibe 12 als Rückenschaufel 14a erscheint.To illustrate the position of the back blading 14 is in Fig. 3 in a schematic representation a front view of a section of the Fig. 2 shown, the position of the back blading in the region of the bottom disk of the impeller is shown. The radial blade 16a is clearly visible on the right-hand side of Fig. 3 , where it is shown penetrating the base plate 12, wherein it appears above the base plate 12 as a back vane 14a.

An dieser Stelle kann man gut nachvollziehen, dass hier vom Effekt her genaugenommen zwei, jeweils ein anderes Medium fördernde Laufräder vorliegen. Das "große" Laufrad 8, welches mittels seiner Radialschaufeln 16 die über den Ventilatoreinlass 13 einströmende Förderluft durch den Radialventilator 1 fördert und das "kleine" Laufrad, welches aus der Bodenscheibe 12 und der Rückenbeschaufelung 14 besteht und die o. g. Mischluft aus Konvektionsluft und Kühlluft in Richtung der Pfeile 34 fördert.At this point it is easy to understand that, strictly speaking, there are two impellers that each promote a different medium. The "large" impeller 8, which, by means of its radial blades 16, conveys the conveying air flowing in via the fan inlet 13 through the radial fan 1 and the "small" impeller, which consists of the base plate 12 and the back blading 14 and the above-mentioned. Mixed air from convection air and cooling air in the direction of arrows 34 promotes.

Auf der Motorplatte 3 sitzende Leitbleche 18 übernehmen die oben näher erläuterte Steuerung der Luftströmung insbesondere im unteren Bereich des Motorgehäuses 2. Ihre Lage und die Lage von die Leitbleche 18 stützenden Versteifungsblechen 20 ist in allen drei Figuren gezeigt.Baffles 18 seated on the motor plate 3 take over the control of the air flow explained in more detail above, in particular in the lower region of the motor housing 2. Their position and the position of the stiffening plates 20 supporting the baffle plates 18 are shown in all three figures.

Weitere in Fig. 3 gezeigte Bauteile, welche bereits in Fig. 1 und Fig . 2 beschrieben wurden, werden im Zusammenhang mit der Fig. 3 nicht mehr näher erwähnt, da sie sich unschwer aus dem Zusammenhang erklären.More in Fig. 3 shown components, which are already in Fig. 1 and Fig. 2nd have been described in connection with the Fig. 3 no longer mentioned, since they are easy to explain from the context.

BezugszeichenReference numerals

11
RadialventilatorCentrifugal fan
22nd
MotorgehäuseMotor housing
33rd
MotorplatteEngine plate
44th
Motorengine
55
VentilatorgehäuseFan housing
66
KühlluftkanalCooling air duct
77
GrundplatteBase plate
88th
LaufradWheel
99
Antriebswelledrive shaft
1010th
KonvektionskanalConvection channel
1111
SeitenwandSide wall
1212th
BodenscheibeBottom disc
1313
VentilatoreinlassFan inlet
1414
RückenbeschaufelungBack blading
14a14a
RückenschaufelBack shovel
1515
GitteröffnungLattice opening
1616
RadialschaufelRadial vane
16a16a
RadialschaufelRadial vane
1818th
LeitblechBaffle
2020
VersteifungsblechStiffening plate
2222
Pfeil Strömungsrichtung Fördermedium z. B. RauchgasArrow flow direction of pumped medium z. B. flue gas
2424th
Pfeil Strömungsrichtung Fördermedium z. B. RauchgasArrow flow direction of pumped medium z. B. flue gas
2626
Pfeil Strömungsrichtung Fördermedium z. B. RauchgasArrow flow direction of pumped medium z. B. flue gas
2828
Pfeil Strömungsrichtung Fördermedium z. B. RauchgasArrow flow direction of pumped medium z. B. flue gas
3030th
Pfeil Strömungsrichtung KonvektionsluftArrow flow direction convection air
3232
Pfeil Strömungsrichtung KühlluftArrow flow direction cooling air
3434
Pfeil Strömungsrichtung der Mischluft aus Konvektionsluft und KühlluftArrow Direction of flow of the mixed air from convection air and cooling air

Claims (6)

  1. Radial fan, in particular roof fan, which has the following features:
    a) a motor housing (2),
    b) a motor (4) mounted on a motor plate (3) arranged on the base of the motor housing (2),
    c) an impeller (8) arranged outside the motor housing (2) and connected non-rotatably to the motor (4),
    d) a cooling air duct (6) opening into the motor housing (2),
    wherein
    e) the motor housing (2) and the cooling air duct (6) are designed as double-walled in such a manner that a convection duct (10), which encases them, is formed,
    f) the impeller (8) comprises a backplate (12) with back blading (14) pointing towards the motor housing (2), thus forming a device for radially discharging cooling air and convection air.
  2. Radial fan according to claim 1, characterised in that the back blading (14) is formed by means of radial blades (16), in particular curved blades, partially pushed through the backplate (12).
  3. Radial fan according to claim 1 or 2, characterised in that baffle plates (18) are arranged around the motor housing (2) to control a targeted airflow.
  4. Radial fan according to claim 3, characterised in that the baffle plates (18) are fixed in relation to the motor housing (2) with the help of stiffening plates (20).
  5. Radial fan according to one of the preceding claims, characterised in that the motor housing (2), the cooling air duct (6) and the convection duct (10) are designed as a riveted sheet metal construction.
  6. Radial fan according to one of the preceding claims, characterised in that the radial blades (16) are welded to the backplate (12) of the impeller (8).
EP19152593.0A 2018-02-07 2019-01-18 Radial fan with motor cooling Active EP3524823B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018102733.8A DE102018102733A1 (en) 2018-02-07 2018-02-07 centrifugal fan

Publications (2)

Publication Number Publication Date
EP3524823A1 EP3524823A1 (en) 2019-08-14
EP3524823B1 true EP3524823B1 (en) 2020-07-01

Family

ID=65041679

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19152593.0A Active EP3524823B1 (en) 2018-02-07 2019-01-18 Radial fan with motor cooling

Country Status (2)

Country Link
EP (1) EP3524823B1 (en)
DE (1) DE102018102733A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11204177B2 (en) * 2020-02-20 2021-12-21 Captive-Aire Systems, Inc. Exhaust fan for a commercial kitchen
CN112814928B (en) * 2021-01-07 2022-10-11 广东华野通风设备有限公司 Independent cooling type fire-fighting smoke exhaust fan

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3117770A (en) * 1961-04-19 1964-01-14 Crom B Campbell Combination air warming and centrifugal fan unit for transmitting heated air
DE3026517C2 (en) * 1980-07-12 1983-09-15 Fa. Julius Söhnle, 7157 Murrhardt Smoke fan
DE8517964U1 (en) * 1985-06-20 1988-01-07 Leithner, Joachim, 7440 Nuertingen, De
DE8525254U1 (en) * 1985-09-04 1985-11-07 VSG Ventilatoren Systeme GmbH, 7150 Backnang Smoke fan
DE9408924U1 (en) * 1994-06-01 1994-08-04 Duechting Pumpen Maschf Gmbh Pump unit immersed in a medium for pumping liquids
DE19632527A1 (en) * 1996-08-13 1998-02-19 Hans Joachim Leithner Ventilator for hot gaseous media

Also Published As

Publication number Publication date
DE102018102733A1 (en) 2019-08-08
EP3524823A1 (en) 2019-08-14

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