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EP3524823A1 - Radial fan with motor cooling - Google Patents

Radial fan with motor cooling Download PDF

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Publication number
EP3524823A1
EP3524823A1 EP19152593.0A EP19152593A EP3524823A1 EP 3524823 A1 EP3524823 A1 EP 3524823A1 EP 19152593 A EP19152593 A EP 19152593A EP 3524823 A1 EP3524823 A1 EP 3524823A1
Authority
EP
European Patent Office
Prior art keywords
motor housing
motor
radial
cooling air
impeller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19152593.0A
Other languages
German (de)
French (fr)
Other versions
EP3524823B1 (en
Inventor
Dr.-Ing. Daniel WOLFRAM
Fabian Schmelz
Joachim Krafft
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.)
DLK Ventilatoren GmbH
Original Assignee
DLK Ventilatoren GmbH
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Publication date
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Publication of EP3524823A1 publication Critical patent/EP3524823A1/en
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Publication of EP3524823B1 publication Critical patent/EP3524823B1/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 centrifugal fan according to the preamble of claim 1.
  • the invention has for its object to propose a centrifugal fan, in which the disadvantages known from the prior art are avoided or at least greatly reduced.
  • double-walled motor housing and cooling air channel form a convection chamber during operation of the centrifugal fan, in which there is negative pressure during operation.
  • the radial fan is designed such that the back blading is formed by means of partially inserted through the bottom plate radial blades, in particular circular arc blades. This represents an advantageous simplification of the construction and the production. It is thereby possible to optimally use the back blading on the impeller.
  • the radial fan is designed such that guide plates are arranged around the motor housing for controlling a targeted air flow.
  • This can be advantageously internal Reduce pressure losses and thus increase the efficiency of a radial fan assembly. These include a possible reduction of flow losses, in part also flow turbulences and thereby a possible reduction of the required engine power for the centrifugal fan, which has economic advantages.
  • the radial fan is designed such that the baffles are fixed by means of stiffening plates relative to the motor housing. This advantageously allows an increase in the stability of the centrifugal fan and its baffles. It can achieve a stiffening of the centrifugal fan.
  • the radial fan is designed such that the motor housing, the cooling air channel and the convection channel are formed as riveted sheet metal construction. This advantageously results in the possibility of a simple and inexpensive production.
  • the radial fan is designed such that the radial blades are welded to the bottom disk of the impeller. This makes it possible to achieve a safe repeat accuracy with a very stable design, for example via welding robots.
  • Fig. 1 shows an embodiment of a fan housing 5 for a centrifugal fan 1, in which a cut-open motor housing 2 can be seen, which in turn surrounds a motor 4 shown cut open.
  • the motor 4 is mounted on a motor plate 3 and penetrates the latter with its drive shaft 9 approximately centrally.
  • the drive shaft 9 is connected via a hub with the bottom plate 12 of an impeller 8.
  • the bottom plate 12 carries a plurality of radial blades 16, each with a (in Fig. 1 to 3 above) approach the bottom plate 12 penetrate and above as back blading 14 (see also Fig. 3 ) are recognizable.
  • the motor plate 3 is connected to a base plate 7 of the fan housing 5, on which also opens out into the impeller 8 fan inlet 13 for the pumped medium, for. B. flue gas is arranged.
  • Fig. 2 is now based on some arrows 22, 24, 26 and 28, the local flow direction of the pumped medium of the radial fan according to the invention, for. B. flue gas shown. In the following, this is simply called “air” for simplicity.
  • air air sucked in by the radial fan 1 according to the invention passes through the fan inlet 13 into the impeller 8 and is sucked radially outwards into the interior of the fan housing 5 as a result of the force generated by the radial blades 16 of the rotating impeller 8 according to the arrows 26 ,
  • the air continues to flow upward deflected, follows the direction of the arrows 22 and finally leaves the fan housing 5 via an outlet designed as a grid opening 15 upwards.
  • the engine 4 is cooled by means of a cooling air introduced in the cooling air duct 6.
  • the air flows through an annular opening located around the drive shaft 9 through the motor plate 3 from the motor housing 2 into the space between the motor plate 3 and bottom plate 12 of the impeller 8.
  • the now somewhat warmed up cooling air mixes with the convection air.
  • the latter flows to cool the motor housing 2 and the cooling air through the convection channel 10, which surrounds each of the cooling air duct 6 and the motor housing 2, in the direction of the arrows 30. It flows further according to the arrow 34 radially outward, where it mixes with the conveying air and escapes above the grid opening 15 upwards.
  • the promotion of the mixed air from convection air and cooling air in the direction of the arrows 34 is supported by the back blading 14.
  • FIG. 3 To clarify the position of the back blading 14 is in Fig. 3 in a schematic representation of a front view of a section of the Fig. 2 shown, with the location of the back blading in the area of the bottom disc of the impeller is shown. Good to see is the radial blade 16a on the right side of Fig. 3 where it is shown penetrating the bottom disc 12, appearing above the bottom disc 12 as a back bucket 14a.
  • the "large” impeller 8 which conveys by means of its radial blades 16 the inflowing air via the fan inlet 13 conveying air through the centrifugal fan 1 and the "small” impeller, which consists of the bottom plate 12 and the back blading 14 and the o.
  • the "large” impeller 8 which conveys by means of its radial blades 16 the inflowing air via the fan inlet 13 conveying air through the centrifugal fan 1 and the "small” impeller, which consists of the bottom plate 12 and the back blading 14 and the o.
  • Mixed air from convection air and cooling air in the direction of arrows 34 promotes.
  • baffles 18 assume the above-explained in more detail control of the air flow, especially in the lower part of the motor housing 2. Their position and the position of the baffles 18 supporting stiffening plates 20 is shown in all three figures.
  • FIG. 3 shown components, which are already in Fig. 1 and Fig. 2 are described in connection with the Fig. 3 not mentioned any further because they are easily explained out of context.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

Radialventilator, insbesondere Dachventilator, mit einem Motorgehäuse (2), einem auf einer am Boden des Motorgehäuses (2) angeordneten Motorplatte (3) montierten Motor (4), einem mit dem Motor (4) drehfest verbundenes außerhalb des Motorgehäuses (2) angeordneten Laufrad (8) und einem in das Motorgehäuse (2) mündenden Kühlluftkanal (6), wobei das Motorgehäuse (2) und der Kühlluftkanal (6) derart doppelwandig ausgebildet sind, dass ein diese ummantelnder Konvektionskanal (10) gebildet wird und das Laufrad (8) eine Bodenscheibe (12) mit einer zum Motorgehäuse (2) zeigenden Rückenbeschaufelung (14) aufweist, wodurch eine Einrichtung zur radialen Ableitung von Kühlluft und Konvektionsluft gebildet wird.Centrifugal fan, in particular a roof fan, with a motor housing (2), a motor (4) mounted on a motor plate (3) mounted on the bottom of the motor housing (2), an impeller outside the motor housing (2) fixed in rotation with the motor (4) (8) and an opening into the motor housing (2) cooling air channel (6), wherein the motor housing (2) and the cooling air duct (6) are formed double-walled such that a convection channel this sheathing (10) is formed and the impeller (8) a bottom disc (12) having a motor housing (2) facing the back blading (14), whereby a means for the radial discharge of cooling air and convection air is formed.

Description

Die vorliegende Erfindung betrifft einen Radialventilator gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a centrifugal 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 centrifugal fans, in particular flue-gas fans - mostly roof fans - are usually cooled by their drive motor supplied cooling air, the motors of the fans by means of their motor housing surrounding insulation layers are thermally insulated from the pumped gas thermally. This protects the motors from overheating. It must also be ensured that the penetration of flue gas into the motor housing and the engine compartment is prevented. Sheet metal components may warp due to high thermal stress. A roof fan, as a fire gas fan of temperature class F600 always requires insulation around or for the motor. Such insulation, it may have a mineral or ceramic base, is expensive.

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 centrifugal 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 der Radialventilator dadurch gekennzeichnet ist, dass
  • e) das Motorgehäuse und der Kühlluftkanal derart doppelwandig ausgebildet sind, dass ein diese ummantelnder Konvektionskanal gebildet wird, und dass
  • 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 centrifugal 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 at the bottom of the motor housing,
  3. c) a rotor rotatably connected to the outside of the motor housing arranged impeller,
  4. d) a cooling air channel opening into the motor housing,
wherein the centrifugal fan is characterized in that
  • e) the motor housing and the cooling air duct are designed to be double-walled in such a way that a convection duct covering them is formed, and in that
  • f) the impeller has a bottom disc with a backshell facing the motor housing, whereby 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 ist (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 inventive design of the centrifugal fan, it is possible, instead of using a conventional insulation, in addition to the existing Luftkonvektion additionally use the air in convection in the double wall principle to protect the engine from overheating. In roof fan F400 / 600 this application is completely new. It is according to the invention in the core to a temperature control in roof fans by Luftkonvektion. The advantages of air convection are known. Air is a very good thermal insulator (this is also used in homes, for example). With the radial fan according to the invention can be achieved by using the double wall system, a number of advantages. Thus, due to overheating resulting sheet deformation of the inner wall of the motor housing are minimized by cooling convection air. According to the invention, double-walled motor housing and cooling air channel form a convection chamber during operation of the centrifugal fan, in which there is negative pressure during operation. This results in the further advantage that false air (eg flue gases) in the convection chamber is prevented due to the negative pressure. Ingress of flue gases into the engine interior due to the negative pressure in the convection chamber is avoided. Additional insulation can advantageously be dispensed with.

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 partially inserted through the bottom plate radial blades, in particular circular arc blades. This represents an advantageous simplification of the construction 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 such that guide plates are arranged around the motor housing for controlling a targeted air flow. This can be advantageously internal Reduce pressure losses and thus increase the efficiency of a radial fan assembly. These include a possible reduction of flow losses, in part also flow turbulences and thereby a possible reduction of the required engine power for the centrifugal 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 such that the baffles are fixed by means of stiffening plates relative to the motor housing. This advantageously allows an increase in the stability of the centrifugal fan and its baffles. It can achieve a stiffening of the centrifugal fan.

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 channel and the convection channel are formed as riveted sheet metal construction. This advantageously results in the possibility of a 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 makes it possible to achieve a safe repeat accuracy with a very stable design, for example via welding robots.

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 explained briefly with reference to an embodiment with the aid of a drawing below.
Fig. 1
shows in a schematic perspective view in the sectional view of an example of a radial fan according to the invention with indication of the flow situation of cooling air and convection air.
Fig. 2
shows in a schematic perspective view of the situation according to Fig. 1 , but not with cut open motor housing.
Fig. 3
shows a schematic representation of a front view of a section of Fig. 2 , wherein the position of the back blading in the region of the bottom disk of the impeller is shown.

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 centrifugal fan 1, in which a cut-open motor housing 2 can be seen, which in turn surrounds a motor 4 shown cut open. The motor 4 is mounted on a motor plate 3 and penetrates the latter with its drive shaft 9 approximately centrally. The drive shaft 9 is connected via a hub with the bottom plate 12 of an impeller 8. The bottom plate 12 carries a plurality of radial blades 16, each with a (in Fig. 1 to 3 above) approach the bottom plate 12 penetrate and above as back blading 14 (see also Fig. 3 ) are recognizable. Via side walls 11, the motor plate 3 is connected to a base plate 7 of the fan housing 5, on which also opens out into the impeller 8 fan inlet 13 for the pumped medium, for. 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 pumped medium of the radial fan according to the invention, for. B. flue gas shown. In the following, this is simply called "air" for simplicity. According to the arrows 28, air sucked in by the radial fan 1 according to the invention passes through the fan inlet 13 into the impeller 8 and is sucked radially outwards into the interior of the fan housing 5 as a result of the force generated by the radial blades 16 of the rotating impeller 8 according to the arrows 26 , According to the arrows 24, the air continues to flow upward deflected, follows the direction of the arrows 22 and finally leaves the fan housing 5 via an outlet designed as a grid 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 introduced in the cooling air duct 6. At the lower end of the motor housing 2, the air flows through an annular opening located around the drive shaft 9 through the motor plate 3 from the motor housing 2 into the space between the motor plate 3 and bottom plate 12 of the impeller 8. There, the now somewhat warmed up cooling air mixes with the convection air. The latter flows to cool the motor housing 2 and the cooling air through the convection channel 10, which surrounds each of the cooling air duct 6 and the motor housing 2, in the direction of the arrows 30. It flows further according to the arrow 34 radially outward, where it mixes with the conveying air and escapes above the grid opening 15 upwards. The promotion of the mixed air from convection air and cooling air in the direction of the 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 clarify the position of the back blading 14 is in Fig. 3 in a schematic representation of a front view of a section of the Fig. 2 shown, with the location of the back blading in the area of the bottom disc of the impeller is shown. Good to see is the radial blade 16a on the right side of Fig. 3 where it is shown penetrating the bottom disc 12, appearing above the bottom disc 12 as a back bucket 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 there are exactly two effect wheels, each conveying a different medium. The "large" impeller 8, which conveys by means of its radial blades 16 the inflowing air via the fan inlet 13 conveying air through the centrifugal fan 1 and the "small" impeller, which consists of the bottom plate 12 and the back blading 14 and the o. 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.On the motor plate 3 seated baffles 18 assume the above-explained in more detail control of the air flow, especially in the lower part of the motor housing 2. Their position and the position of the baffles 18 supporting stiffening plates 20 is 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.Further in Fig. 3 shown components, which are already in Fig. 1 and Fig. 2 are described in connection with the Fig. 3 not mentioned any further because they are easily explained out of context.

Bezugszeichenreference numeral

11
Radialventilatorcentrifugal fan
22
Motorgehäusemotor housing
33
MotorplatteMotorplatte
44
Motorengine
55
Ventilatorgehäusefan housing
66
KühlluftkanalCooling air duct
77
Grundplattebaseplate
88th
LaufradWheel
99
Antriebswelledrive shaft
1010
Konvektionskanalconvection
1111
SeitenwandSide wall
1212
Bodenscheibebottom disk
1313
Ventilatoreinlassfan inlet
1414
Rückenbeschaufelungrear blade
14a14a
Rückenschaufelrear vane
1515
Gitteröffnunggrid opening
1616
Radialschaufelradial blade
16a16a
Radialschaufelradial blade
1818
Leitblechbaffle
2020
Versteifungsblechgusset
2222
Pfeil Strömungsrichtung Fördermedium z. B. RauchgasArrow flow direction conveying medium z. B. flue gas
2424
Pfeil Strömungsrichtung Fördermedium z. B. RauchgasArrow flow direction conveying medium z. B. flue gas
2626
Pfeil Strömungsrichtung Fördermedium z. B. RauchgasArrow flow direction conveying medium z. B. flue gas
2828
Pfeil Strömungsrichtung Fördermedium z. B. RauchgasArrow flow direction conveying medium z. B. flue gas
3030
Pfeil Strömungsrichtung KonvektionsluftArrow flow direction convection air
3232
Pfeil Strömungsrichtung KühlluftArrow flow direction cooling air
3434
Pfeil Strömungsrichtung der Mischluft aus Konvektionsluft und KühlluftArrow Flow direction of the mixed air from convection air and cooling air

Claims (6)

Radialventilator, insbesondere Dachventilator, welcher folgende Merkmale aufweist: a) ein Motorgehäuse (2), b) einen auf einer am Boden des Motorgehäuses (2) angeordneten Motorplatte (3) montierten Motor (4), c) ein mit dem Motor (4) drehfest verbundenes außerhalb des Motorgehäuses (2) angeordneten Laufrad (8), d) einen in das Motorgehäuse (2) mündenden Kühlluftkanal (6), dadurch gekennzeichnet, dass e) das Motorgehäuse (2) und der Kühlluftkanal (6) derart doppelwandig ausgebildet sind, dass ein diese ummantelnder Konvektionskanal (10) gebildet wird, f) das Laufrad (8) eine Bodenscheibe (12) mit einer zum Motorgehäuse (2) zeigenden Rückenbeschaufelung (14) aufweist, wodurch eine Einrichtung zur radialen Ableitung von Kühlluft und Konvektionsluft gebildet wird. 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 at the bottom of the motor housing (2), c) an impeller (8) which is connected in a rotationally fixed manner to the motor (4) and is arranged outside the motor housing (2), d) a cooling air channel (6) opening into the motor housing (2), characterized in that e) the motor housing (2) and the cooling air duct (6) are designed to be double-walled in such a way that a convection duct (10) enveloping them is formed, f) the impeller (8) has a bottom disc (12) with a motor housing (2) facing back blading (14), whereby a means for the radial discharge of cooling air and convection air is formed. Radialventilator nach Anspruch 1, dadurch gekennzeichnet, dass die Rückenbeschaufelung (14) mittels teilweise durch die Bodenscheibe (12) gesteckter Radialschaufeln (16), insbesondere Kreisbogenschaufeln gebildet wird.Radial fan according to claim 1, characterized in that the back blading (14) by means of partially through the bottom plate (12) inserted radial blades (16), in particular circular arc blades is formed. Radialventilator nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass um das Motorgehäuse (2) herum Leitbleche (18) zur Steuerung einer gezielten Luftführung angeordnet sind.Radial fan according to claim 1 or 2, characterized in that around the motor housing (2) around baffles (18) are arranged for controlling a targeted air flow. Radialventilator nach Anspruch 3, dadurch gekennzeichnet, dass die Leitbleche (18) mit Hilfe von Versteifungsblechen (20) gegenüber dem Motorgehäuse (2) fixiert sind.Radial fan according to claim 3, characterized in that the guide plates (18) by means of stiffening plates (20) relative to the motor housing (2) are fixed. Radialventilator nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Motorgehäuse (2), der Kühlluftkanal (6) und der Konvektionskanal (10) als vernietete Blechkonstruktion ausgebildet sind.Radial fan according to one of the preceding claims, characterized in that the motor housing (2), the cooling air duct (6) and the convection duct (10) are designed as riveted sheet metal construction. Radialventilator nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Radialschaufeln (16) mit der Bodenscheibe (12) des Laufrads (8) verschweißt sind.Radial fan according to one of the preceding claims, characterized in that the radial blades (16) with the bottom disc (12) of the impeller (8) are welded.
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

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

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DE (1) DE102018102733A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112814928A (en) * 2021-01-07 2021-05-18 广东华野通风设备有限公司 Independent cooling type fire-fighting smoke exhaust fan
WO2021167692A1 (en) * 2020-02-20 2021-08-26 Captive-Aire Systems, Inc. Exhaust fan for a commercial kitchen

Citations (2)

* 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
DE8517964U1 (en) * 1985-06-20 1988-01-07 Leithner, Joachim, 7440 Nürtingen Roof fan

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Publication number Priority date Publication date Assignee Title
DE3026517C2 (en) * 1980-07-12 1983-09-15 Fa. Julius Söhnle, 7157 Murrhardt Smoke fan
DE8525254U1 (en) * 1985-09-04 1985-11-07 VSG Ventilatoren Systeme GmbH, 7150 Backnang Smoke fan
DE9408924U1 (en) * 1994-06-01 1994-08-04 Düchting Pumpen Maschinenfabrik GmbH & Co. KG, 58453 Witten 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

Patent Citations (2)

* 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
DE8517964U1 (en) * 1985-06-20 1988-01-07 Leithner, Joachim, 7440 Nürtingen Roof fan

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021167692A1 (en) * 2020-02-20 2021-08-26 Captive-Aire Systems, Inc. Exhaust fan for a commercial kitchen
US11204177B2 (en) 2020-02-20 2021-12-21 Captive-Aire Systems, Inc. Exhaust fan for a commercial kitchen
EP4107437A4 (en) * 2020-02-20 2024-02-28 Captive-Aire Systems, Inc. Exhaust fan for a commercial kitchen
CN112814928A (en) * 2021-01-07 2021-05-18 广东华野通风设备有限公司 Independent cooling type fire-fighting smoke exhaust fan

Also Published As

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DE102018102733A1 (en) 2019-08-08

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