EP0070423A1 - Cooling of the electric motor of an axial ventilator - Google Patents

Cooling of the electric motor of an axial ventilator Download PDF

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Publication number
EP0070423A1
EP0070423A1 EP82105739A EP82105739A EP0070423A1 EP 0070423 A1 EP0070423 A1 EP 0070423A1 EP 82105739 A EP82105739 A EP 82105739A EP 82105739 A EP82105739 A EP 82105739A EP 0070423 A1 EP0070423 A1 EP 0070423A1
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EP
European Patent Office
Prior art keywords
hub shell
axial
hub
indentations
electric motor
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
EP82105739A
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German (de)
French (fr)
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EP0070423B1 (en
Inventor
Heinz Laub
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.)
Maico Elektroapparate Fabrik GmbH
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Maico Elektroapparate Fabrik GmbH
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Priority to AT82105739T priority Critical patent/ATE14607T1/en
Publication of EP0070423A1 publication Critical patent/EP0070423A1/en
Application granted granted Critical
Publication of EP0070423B1 publication Critical patent/EP0070423B1/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
    • 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
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • 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
    • F04D25/12—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit being adapted for mounting in apertures
    • 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

Definitions

  • the invention relates to an axial fan according to the preamble of claim 1.
  • the cup-shaped hub of the impeller is used in axial fans of this type in order to achieve the shortest possible axial length without, as is also known, an electric motor with an external rotor on which the blades are arranged required, since external rotor motors are structurally complex and also relative need large air gaps that reduce efficiency.
  • the electric motor can be a conventional, axially short motor with a rotor (inner rotor) arranged inside the stator. It is disadvantageous, however, that the cooling of the motor is due to the cup-shaped hub of the impeller which comprises the largest part of the electric motor housing
  • the axially vented slots listed in the preamble of claim 1 are obviously arranged on the hubs of previously used wall and window fans, these venting slots beginning at the end face of the impeller hub. Although these ventilation slots improve engine cooling, it is desirable to further improve engine cooling.
  • the indentations of the hub extend between the bases of the wing blades. It has proven to be particularly expedient if the axial depth of the indentations is approximately 0.1 to 0.25 times the axial length of the impeller hub, preferably approximately 0.17 to 0.21 times the axial hub length.
  • the indentations can have different shapes and different numbers of indentations can be provided.
  • the number of indentations corresponds to the number of blades of the impeller.
  • the edges of the indentations are approximately circular in shape.
  • the axial length of the axial ventilation slots beginning at the end face or in the vicinity of the end face of the hub can expediently be several times greater than the axial depth of the axial indentations.
  • the number of these axial ventilation slots can preferably correspond to the number of indentations.
  • This axial ventilation slots can preferably extend over at least half the axial length of the hub shell, preferably about 0.5 to 0.7 times the axial length of the hub shell.
  • the width of the axial ventilation slots can be relatively small. If their number corresponds to the number of vane blades, the width of the individual axial ventilation slot can preferably suitably correspond approximately to 0.02 to 0.03 times the circumference of the impeller shell.
  • the axial fan 10 according to FIG. 1, which is designed as a window fan, has an outer housing 11, on the suction side of which pivotable closure lamellae 12 can be opened and shut off, and on the air outlet side of which an air passage grille 13 is arranged.
  • an electric motor 14 with an inner rotor is arranged in the center, the motor housing 15 of which is axially fastened to a motor holder 52 by means of bolts 16 and on the motor shaft of which is directed towards the air outlet grille 13, an impeller 17 with a cup-shaped hub 19 is fastened, which in this exemplary embodiment is five Has blades 21, which are designed identically among themselves and are arranged at equal intervals over the circumference of the hub shell 20.
  • the hub shell 20 extends axially from the flat, closed end disk 23 of the hub 19 to the vicinity of the rear end side of the motor housing 15, in this exemplary embodiment over approximately 0.85 times the length of the motor housing.
  • the hub shell 20 encompasses the motor housing 15 to form an annular gap 24 at a distance, which annular gap 24 is used for the cooling air serving to flow through the engine cooling, the open, five indentations 22 (FIGS. 3, 4) with circular edges having an open, rear end face the hub 19 flows in and leaves this annular gap through a total of five axial ventilation slots 25 of the hub shell 20, which extend parallel to the longitudinal axis of the motor.
  • the bases (feet) 26 of the wing blades 21 extend as shown in FIG.
  • the number of indentations 22 corresponds to the number of wing blades 21 and each indentation 22 projects between the bases 26 of two adjacent wing blades 21.
  • the axial depth (measured parallel to the longitudinal axis of the motor) of each indentation 22 in this exemplary embodiment corresponds approximately to 0.19 times the axial length of the hub shell 20, the longitudinal central axis of each indentation 22 parallel to the central axis of the hub passing through the center of the base 26 in the axial direction of the Hub 19 adjacent wing blade 21 passes through and the central angle related to the longitudinal central axis of the hub 19, over which each indentation 22 extends, corresponds approximately to the central angle over which the base 26 of the axially upstream vane leaf 21 extends, so that the indentations 22 in are spaced from each other.
  • the number of ventilation slots 25 corresponds to the number of indentations 22.
  • the longitudinal central axes of the ventilation slots 25 are angularly offset from the longitudinal central axes of the indentations 22, specifically by about a third of the central angle of the individual indentation 22.
  • These ventilation slots 25 can also be referred to as longitudinal slots.
  • the width of the ventilation slots 25 starting at the face plate 23 of the hub 19 is approximately 0.026 times the circumference of the hub shell 20 per slot.
  • the indentations 22 improve the cooling of the electric motor. It can be assumed that they increase the cooling air flow and also increase its turbulence. Comparative measurements on the axial fan shown in the exemplary embodiment, in which the impeller initially did not yet have the indentations of the hub shell and then these indentations were milled and the same measurements were carried out, showed that the motor temperature with free blowing out by about 6 K and with blowing out against one the wall opposite the grid 13 at a short distance dropped by approx. 19 K.
  • the open end face of the hub 19 is located opposite a tubular connecting piece 50 of the motor mount 52 at an axial distance of a few millimeters, so that here a front end of the hub shell 20 which is limited by the connecting piece 50 and the indentations 22 There is an annular gap 30 through which cooling air can flow into the gap 24.
  • This connecting piece 50 is necessary for stiffening the annular disk 54 carried by radial webs 53, the circumference of which it strives for, since the motor 14 is fastened to this annular disk 54 by means of the bolts 16.
  • the Sen nozzle 50 protrudes the rear bearing plate 51 of the motor housing 15 up to close to the washer 54, wherein the nozzle 50 comprises this bearing plate 51 at a distance.
  • the axial distance of the hub shell 2 0 from the socket 50 can preferably max. 8 mm, in particular 1 to 5 mm. The smaller it is, the shorter the axial length of the fan 10, so that the indentations 22 also make it possible to reduce this axial distance and thus to reduce the axial length of the fan by improving the engine cooling.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

1. Axial ventilator, preferably a window or wall ventilator, having an electric motor (14), on the motor shaft of which is coaxially secured a cup-shaped hub (19) of a fan wheel (17), of which the hub cover (20) encloses the electric motor housing (15) at a distance forming an annular gap (24) through which cool air can flow, the hub cover (20) extending at least over seven tenths, and preferably approximately between eight and nine tenths, of the length of the electric motor housing (15), blades (21) additionally being arranged on the periphery of the hub cover, the bases of the blades extending almost over the length of the hub cover in a diagonal direction to the geometrical generatrices of the hub cover which intersect them, and in addition axial venting slots (25) being provided in the hub cover and extending from the front disc (23) of the hub or from the vicinity of the said front disc in between the bases of the blades (21) and terminating at a distance from the rear end face of the hub cover, characterised in that the rear end face of the hub cover (20) is provided with axial recesses (22) for improving the inflow of cool air.

Description

Die Erfindung betrifft einen Axialventilator gemäß dem Oberbegriff des Anspruches 1.The invention relates to an axial fan according to the preamble of claim 1.

Die topfförmige Nabe des Flügelrades dient bei derartigen Axialventilatoren dazu, um möglichst kurze axiale Baulänge zu erzielen, ohne daß es hierzu, wie ebenfalls bekannt, eines Elektromotors mit Außenläufer, an dem die Flügelblätter angeordnet sind, bedarf, da Außenläufermotoren baulich aufwendig sind und auch relativ große Luftspalte benötigen, die den Wirkungsgrad reduzieren. Bei Axialventilatoren gemäß dem Oberbegriff des Anspruches 1 kann dagegen der Elektromotor ein üblicher, axial kurz bauender Motor mit innerhalb des Stators angeordnetem Läufer (Innenläufer) sein. Nachteilig ist jedoch, daß durch die den größten Teil des Elektromotorengehäuses umfaßende topfförmige Nabe des Flügelrades die Kühlung des MotorsThe cup-shaped hub of the impeller is used in axial fans of this type in order to achieve the shortest possible axial length without, as is also known, an electric motor with an external rotor on which the blades are arranged required, since external rotor motors are structurally complex and also relative need large air gaps that reduce efficiency. In the case of axial fans according to the preamble of claim 1, on the other hand, the electric motor can be a conventional, axially short motor with a rotor (inner rotor) arranged inside the stator. It is disadvantageous, however, that the cooling of the motor is due to the cup-shaped hub of the impeller which comprises the largest part of the electric motor housing

relativ schlecht ist, besonders auch dann, wenn der Motor im Inneren eines Außengehäuses eines Wand- oder Fensterventilators angeordnet ist. Schlechte Kühlung bedeutet hohe Motorbetriebstemperatur und reduziert so bei vorgegebenem Motorvolumen die zulässige Motorleistung und/oder verbietet den Einsatz solcher Axialventilatoren bei höheren Umgebungstemperaturen, wie sie beispielsweise in tropischen Ländern auftreten.is relatively bad, especially when the motor is arranged inside an outer housing of a wall or window fan. Poor cooling means high engine operating temperature and thus reduces the permissible engine power for a given engine volume and / or prohibits the use of such axial fans at higher ambient temperatures, such as occur in tropical countries.

Zur Verbesserung der Kühlung der Elektromotoren solcher Axialventilatoren mit topfförmiger Flügelradnabe sind an den Naben offenkundig vorbenutzter Wand- und Fensterventilatoren die im Oberbegriff des Anspruches 1 aufgeführten axialen Lüftungsschlitze angeordnet, wobei diese Lüftungsschlitze an der Stirnseite der Flügelradnabe begannen. Durch diese Lüftungsschlitze wird zwar die Motorkühlung verbessert, doch ist es wünschenswert, die Motorkühlung noch weiter zu verbessern.In order to improve the cooling of the electric motors of such axial fans with cup-shaped impeller hubs, the axially vented slots listed in the preamble of claim 1 are obviously arranged on the hubs of previously used wall and window fans, these venting slots beginning at the end face of the impeller hub. Although these ventilation slots improve engine cooling, it is desirable to further improve engine cooling.

Es ist deshalb Aufgabe der Erfindung, die Kühlung eines Axialventilators gemäß dem Oberbegriff des Anspruches 1 zu verbessern, ohne den baulichen.Aufwand zu erhöhen.It is therefore an object of the invention to improve the cooling of an axial fan according to the preamble of claim 1 without increasing the structural outlay.

Diese Aufgabe wird bei einem Axialventilator gemäß dem Oberbegriff des Anspruches 1 erfindungsgemäß dadurch gelöst, daß das rückwärtige Stirnende des Nabenmantels mit axialen Einbuchtungen versehen ist.'This object is achieved with an axial fan according to the preamble of claim 1 in that the rear end of the hub shell is provided with axial indentations.

Durch die Einbuchtungen tritt eine Verbesserung der Kühlung des Elektromotores ein, die sich bei unveränderter Auslegung des Elektromotores in einer Senkung seiner Betriebstemperatur auswirkt und/oder man kann die Motorleistungen bei unveränderten Gehäuseabmessungen erhöhen. Auch zeigte es sich bei einem untersuchten Fenster-Axialventilator, daß auch sein Wirkungsgrad durch die erfindungsgemäße Maßnahme erhöht wurde.The indentations result in an improvement in the cooling of the electric motor, which results in a reduction in its loading if the design of the electric motor remains unchanged affects the operating temperature and / or you can increase the motor power with unchanged housing dimensions. It was also found in an investigated window axial fan that its efficiency was also increased by the measure according to the invention.

Bevorzugt kann vorgesehen sein, daß die Einbuchtungen der Nabe sich zwischen die Basen der Flügelblätter hineinerstrecken. Als besonders zweckmäßig hat es sich erwiesen, wenn die axiale Tiefe der Einbuchtungen ungefähr das 0,1- bis 0,25-fache der axialen Länge der Flügelradnabe betragen, vorzugsweise ungefähr das o,17- bis 0,21-fache der axialen Nabenlänge.It can preferably be provided that the indentations of the hub extend between the bases of the wing blades. It has proven to be particularly expedient if the axial depth of the indentations is approximately 0.1 to 0.25 times the axial length of the impeller hub, preferably approximately 0.17 to 0.21 times the axial hub length.

Die Einbuchtungen können unterschiedliche Gestalt haben und es können unterschiedliche Anzahlen von Einbuchtungen vorgesehen sein. Bei einer bevorzugten Ausführungsform entspricht die Anzahl der Einbuchtungen der Anzahl der Flügelblätter des Flügelrades. Ferner ist bei einer bevorzugten Ausführungsform vorgesehen, daß die Ränder der Einbuchtungen ungefähr kreisbogenförmig gestaltet sind.The indentations can have different shapes and different numbers of indentations can be provided. In a preferred embodiment, the number of indentations corresponds to the number of blades of the impeller. Furthermore, it is provided in a preferred embodiment that the edges of the indentations are approximately circular in shape.

Die axiale Länge der an der Stirnseite oder in der Nähe der Stirnseite der Nabe beginnenden axialen Lüftungsschlitze kann zweckmäßig mehrfach größer als die axiale Tiefe der axialen Einbuchtungen sein. Die Anzahl dieser axialen Lüftungsschlitze kann vorzugsweise der Anzahl der Einbuchtungen entsprechen. Diese axialen Lüftungsschlitze können sich vorzugsweise über-mindestens die halbe axiale Länge des Nabenmantels erstrecken, vorzugsweise ungefähr über das 0,5- bis 0,7-fache der axialen Länge des Nabenmantels. Die Breite der axialen Lüftungsschlitze kann dagegen relativ gering sein. Wenn ihre Anzahl der Anzahl der Flügelblätter entspricht, kann die Breite des einzelnen axialen Lüftungsschlitzes vorzugsweise zweckmäßig ungefähr dem 0,02- bis 0,03-fachen des Umfanges des Flügelradmantels entsprechen.The axial length of the axial ventilation slots beginning at the end face or in the vicinity of the end face of the hub can expediently be several times greater than the axial depth of the axial indentations. The number of these axial ventilation slots can preferably correspond to the number of indentations. This axial ventilation slots can preferably extend over at least half the axial length of the hub shell, preferably about 0.5 to 0.7 times the axial length of the hub shell. In contrast, the width of the axial ventilation slots can be relatively small. If their number corresponds to the number of vane blades, the width of the individual axial ventilation slot can preferably suitably correspond approximately to 0.02 to 0.03 times the circumference of the impeller shell.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Es zeigen:

  • Fig. 1 einen Teillängsschnitt durch einen Fenster-Axialventilator gemäß einem Ausführungsbeispiel der Erfindung, wobei der Elektromotor nicht geschnitten dargestellt ist,
  • Fig. 2 eine teilweise gebrochene Vorderansicht des Flügelrades des Ventilators nach Fig. 1,
  • Fig. 3 eine Seitenansicht des Flügelrades nach Fig. 2, wobei jedoch nur eines der Flügelblätter dargestellt und die anderen weggelassen sind,
  • Fig. 4 einen Längsschnitt durch die Flügelradnabe des Flügelrades nach Fig. 2.
In the drawing, an embodiment of the invention is shown. Show it:
  • 1 shows a partial longitudinal section through a window axial fan according to an exemplary embodiment of the invention, the electric motor not being shown in section,
  • 2 is a partially broken front view of the impeller of the fan of FIG. 1,
  • 3 is a side view of the impeller of FIG. 2, but only one of the blades is shown and the others are omitted,
  • 4 shows a longitudinal section through the impeller hub of the impeller according to FIG. 2.

Der als Fensterventilator ausgebildete Axialventilator 10 nach Fig. 1 weist ein Außengehäuse 11 auf, an dessen Saugseite schwenkbare Verschlußlamellen 12 zum öffnen und Absperren und auf dessen Luftaustrittsseite ein Luftdurchlaßgitter 13 angeordnet sind. Im Außengehäuse 11 ist mittig ein Elektromotor 14 mit Innenläufer angeordnet, dessen Motorgehäuse 15 an einer Motorhalterung 52 mittels Bolzen 16 axial befestigt ist und auf dessen auf das Luftdurchlaßgitter 13 zu gerichtete Motorwelle ein Flügelrad 17 mit topfförmiger Nabe 19 befestigt ist, das in diesem Ausführungsbeispiel fünf Flügelblätter 21 aufweist, die unter sich gleich gestaltet und in gleichen Abständen über den Umfang des Nabenmantels 20 verteilt angeordnet sind. Der Nabenmantel 20 erstreckt sich von der ebenen, geschlossenen Stirnscheibe 23 der Nabe 19 aus axial bis in die Nähe der rückwärtigen Stirnseite des Motorgehäuses 15, und zwar in diesem Ausführungsbeispiel über etwa das 0,85-fache der Länge des Motorengehäuses. Der Nabenmantel 20 umfaßt das Motorgehäuse 15 unter Bildung eines Ringspaltes 24 im Abstand, welcher Ringspalt 24 dem Durchströmen von der Motorkühlung dienender Kühlluft dient, die vom offenen, fünf gleichgestaltete Einbuchtungen 22 (Fig. 3, 4) mit kreisbogenförmigen Rändern aufweisenden offenen, rückwärtigen Stirnende der Nabe 19 einströmt und diesen Ringspalt durch insgesamt fünf axiale Lüftungsschlitze 25 des Nabenmantels 20 wieder verläßt, die sich parallel zur Motorlängsachse erstrecken. Die Basen (Füße) 26 der Flügelblätter 21 verlaufen gemäß Fig. 3 (wo eines der Flügelblätter 21 dargestellt ist und die übrigen Flügelblätter sind zur Vereinfachung in Fig. 3 weggelassen) schräg zu den sie kreuzenden geometrischen Mantellinien des Nabenmantels 20 und diese Basis 26 des Flügelblattes reicht in Fig. 3 von der Stelle 27.bis zur Stelle 28, so daß sich diese Basis 26 nahezu über die axiale Länge des Nabenmantels 20 erstreckt.The axial fan 10 according to FIG. 1, which is designed as a window fan, has an outer housing 11, on the suction side of which pivotable closure lamellae 12 can be opened and shut off, and on the air outlet side of which an air passage grille 13 is arranged. In the outer housing 11, an electric motor 14 with an inner rotor is arranged in the center, the motor housing 15 of which is axially fastened to a motor holder 52 by means of bolts 16 and on the motor shaft of which is directed towards the air outlet grille 13, an impeller 17 with a cup-shaped hub 19 is fastened, which in this exemplary embodiment is five Has blades 21, which are designed identically among themselves and are arranged at equal intervals over the circumference of the hub shell 20. The hub shell 20 extends axially from the flat, closed end disk 23 of the hub 19 to the vicinity of the rear end side of the motor housing 15, in this exemplary embodiment over approximately 0.85 times the length of the motor housing. The hub shell 20 encompasses the motor housing 15 to form an annular gap 24 at a distance, which annular gap 24 is used for the cooling air serving to flow through the engine cooling, the open, five indentations 22 (FIGS. 3, 4) with circular edges having an open, rear end face the hub 19 flows in and leaves this annular gap through a total of five axial ventilation slots 25 of the hub shell 20, which extend parallel to the longitudinal axis of the motor. The bases (feet) 26 of the wing blades 21 extend as shown in FIG. 3 (where one of the wing blades 21 is shown and the remaining wing blades are for simplification omitted in Fig. 3) obliquely to the intersecting geometric surface lines of the hub shell 20 and this base 26 of the wing blade extends in Fig. 3 from the point 27th to the point 28, so that this base 26 extends almost over the axial length of the hub shell 20 extends.

Die Anzahl der Einbuchtungen 22 entspricht in diesem Ausführungsbeispiel der Anzahl der Flügelblätter 21 und jede Einbuchtung 22 ragt zwischen die Basen 26 von zwei einander benachbarten Flügelblättern 21 hinein. Die axiale Tiefe (gemessen parallel zur Motorlängsachse) jeder Einbuchtung 22 entspricht in diesem Ausführungsbeispiel ungefähr dem 0,19-fachen der axialen Länge des Nabenmantels 20, wobei die zur Nabenlängsmittelachse parallele Längsmittelachse jeder Einbuchtung 22 durch die Mitte der Basis 26 des in axialer Richtung der Nabe 19 benachbarten Flügelblattes 21 hindurchgeht und der auf die Längsmittelachse der Nabe 19 bezogene Zentriwinkel, über den sich jede Einbuchtung 22 erstreckt, entspricht ungefähr dem Zentriwinkel, über den sich die Basis 26 des ihr axial vorgeordneten Flügelblattes 21 erstreckt, so daß die Einbuchtungen 22 in geringen Abständen voneinander angeordnet sind. Die Anzahl der Lüftungsschlitze 25 entspricht der Anzahl der Einbuchtungen 22. Die Längsmittelachsen der Lüftungsschlitze 25 sind zu den Längsmittelachsen der Einbuchtungen 22 winkelversetzt, und zwar um etwa ein Drittel des Zentriwinkels der einzelnen Einbuchtung 22. Diese Lüftungsschlitze 25 kann man auch als Längsschlitze bezeichnen.In this exemplary embodiment, the number of indentations 22 corresponds to the number of wing blades 21 and each indentation 22 projects between the bases 26 of two adjacent wing blades 21. The axial depth (measured parallel to the longitudinal axis of the motor) of each indentation 22 in this exemplary embodiment corresponds approximately to 0.19 times the axial length of the hub shell 20, the longitudinal central axis of each indentation 22 parallel to the central axis of the hub passing through the center of the base 26 in the axial direction of the Hub 19 adjacent wing blade 21 passes through and the central angle related to the longitudinal central axis of the hub 19, over which each indentation 22 extends, corresponds approximately to the central angle over which the base 26 of the axially upstream vane leaf 21 extends, so that the indentations 22 in are spaced from each other. The number of ventilation slots 25 corresponds to the number of indentations 22. The longitudinal central axes of the ventilation slots 25 are angularly offset from the longitudinal central axes of the indentations 22, specifically by about a third of the central angle of the individual indentation 22. These ventilation slots 25 can also be referred to as longitudinal slots.

Die Breite der an der Stirnscheibe 23 der Nabe 19 beginnenden Lüftungsschlitze 25 beträgt in diesem Ausführungsbeispiel pro Schlitz ungefähr das 0,026-fache des Umfanges des Nabenmantels 20.In this exemplary embodiment, the width of the ventilation slots 25 starting at the face plate 23 of the hub 19 is approximately 0.026 times the circumference of the hub shell 20 per slot.

Die Einbuchtungen 22 verbessern die Kühlung des Elektromotores. Es ist zu vermuten, daß sie die Kühlluftströmung vergrößern und auch deren Turbulenz erhöhen. So ergaben Vergleichsmessungen an dem im Ausführungsbeispiel dargestellten Axialventilator, bei welchem das Flügelrad zunächst die Einbuchtungen des Nabenmantels noch nicht aufwies und danach diese Einbuchtungen eingefräst wurden und dieselben Messungen durchgeführt wurden, daß die Motortemperatur bei freiem Ausblasen um ca. 6 K und bei Ausblasen gegen eine dem Gitter 13 in geringem Abstand gegenüberstehende Wand um ca. 19 K sank.The indentations 22 improve the cooling of the electric motor. It can be assumed that they increase the cooling air flow and also increase its turbulence. Comparative measurements on the axial fan shown in the exemplary embodiment, in which the impeller initially did not yet have the indentations of the hub shell and then these indentations were milled and the same measurements were carried out, showed that the motor temperature with free blowing out by about 6 K and with blowing out against one the wall opposite the grid 13 at a short distance dropped by approx. 19 K.

Wie ferner aus Fig. 1 ersichtlich, befindet sich das offene Stirnende der Nabe 19 einem rohrförmigen Stutzen 50 der Motorhalterung 52 im axialen Abstand von einigen Millimetern gegenüber, so daß hier ein von dem Stutzen 50 und dem die Einbuchtungen 22 aufweisenden Stirnende des Nabenmantels 20 begrenzter Ringspalt 30 vorhanden ist, durch den Kühlluft in den Spalt 24 einströmen kann. Dieser Stutzen - 50 ist zur Versteifung der von radialen Stegen 53 getragenen Ringscheibe 54, von deren Umfang er abstrebt, notwendig, da der Motor 14 an dieser Ringscheibe 54 mittels der Bolzen 16 befestigt ist. In diesen Stutzen 50 ragt das rückwärtige Lagerschild 51 des Motorgehäuses 15 bis nahe an die Ringscheibe 54 hinein, wobei der Stutzen 50 dieses Lagerschild 51 im Abstand umfaßt. Es kann so auch Kühlluft zum Spalt 24 durch den Zwischenraum zwischen dem Lagerschild 51 und der aus der Ringscheibe 54 und dem Stutzen 50 bestehenden Motorhalterung hindurch strömen. Der axiale Abstand des Nabenmantels 20 vom Stutzen 50 kann vorzugsweise max. 8 mm, insbesondere 1 bis 5 mm betragen. Je kleiner er ist, umso kürzer kann die axiale Baulänge des Ventilators 10 sein, so daß die Einbuchtungen 22 durch die Verbesserung der Motorkühlung auch Verringerungen dieses axialen Abstandes und damit Verringerung der axialen Baulänge des Ventilators ermöglichen.As can further be seen from FIG. 1, the open end face of the hub 19 is located opposite a tubular connecting piece 50 of the motor mount 52 at an axial distance of a few millimeters, so that here a front end of the hub shell 20 which is limited by the connecting piece 50 and the indentations 22 There is an annular gap 30 through which cooling air can flow into the gap 24. This connecting piece 50 is necessary for stiffening the annular disk 54 carried by radial webs 53, the circumference of which it strives for, since the motor 14 is fastened to this annular disk 54 by means of the bolts 16. In the Sen nozzle 50 protrudes the rear bearing plate 51 of the motor housing 15 up to close to the washer 54, wherein the nozzle 50 comprises this bearing plate 51 at a distance. It can also flow cooling air to the gap 24 through the space between the bearing plate 51 and the motor holder consisting of the annular disk 54 and the nozzle 50 un g through. The axial distance of the hub shell 2 0 from the socket 50 can preferably max. 8 mm, in particular 1 to 5 mm. The smaller it is, the shorter the axial length of the fan 10, so that the indentations 22 also make it possible to reduce this axial distance and thus to reduce the axial length of the fan by improving the engine cooling.

Claims (9)

1. Axialventilator, vorzugsweise Fenster- oder Wandventilator, mit einem Elektromotor, auf dessen Motorwelle eine topfförmige Nabe eines Flügelrades koaxial befestigt ist, deren Nabenmantel das Elektromotorengehäuse unter Bildung eines von Kühlluft durchströmbaren Ringspaltes im Abstand umfaßt, wobei der'Nabenmantel sich zumindest über das 0,7-fache, vorzugsweise ungefähr das O,8- bis O,9-fache der Länge des Motorengehäuses erstreckt, und wobei ferner am Umfang des Nabenmantels Flügelblätter angeordnet sind, deren Basen sich nahezu über die Länge des Nabenmantels in zu den sie schneidenden geometrischen Mantellinien des Nabenmantels schräger Richtung erstrecken und ferner in dem Nabenmantel axiale Lüftungsschlitze vorhanden sind, die sich von der Stirnscheibe der ' Nabe oder von der Nähe dieser Stirnscheibe aus zwischen die Basen der Flügelblätter hinein erstrecken und im Abstand vor dem rückwärtigen Stirnende des Nabenmantels enden, dadurch gekennzeichnet, daß das rückwärtige Stirnende des Nabenmantels (20) mit axialen Einbuchtungen (22) versehen ist.1. Axial fan, preferably a window or wall fan, with an electric motor, on the motor shaft of which a cup-shaped hub of an impeller is coaxially fastened, the hub shell of which surrounds the electric motor housing with the formation of an annular gap through which cooling air can flow, the hub shell extending at least over the 0th , 7 times, preferably about 0, 8 to 0, 9 times the length of the motor housing, and furthermore wing blades are arranged on the circumference of the hub shell, the bases of which extend almost over the length of the hub shell to the geometrical intersecting Shell lines of the hub shell extend obliquely and there are also axial ventilation slots in the hub shell, which extend from the front disk of the 'hub or from the vicinity of this front disk between the bases of the blades and end at a distance from the rear end of the hub shell, thereby characterized that the rear forehead e of the hub shell (20) is provided with axial indentations (22). 2. Ventilator nach Anspruch 1, dadurch gekennzeichnet, daß die Ränder der Einbuchtungen (22) des Nabenmantels ungefähr kreisbogenförmigen Verlauf haben.2. Fan according to claim 1, characterized in that the edges of the indentations (22) of the hub shell have an approximately circular arc shape. 3. Ventilator nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die axiale Tiefe der Einbuchtungen (22) ungefähr dem 0,1- bis0,25-fachen, vorzugsweise ungefähr dem 0,17- bis 0,21-fachen der axialen Länge des Nabenmantels entspricht.3. Fan according to claim 1 or 2, characterized in that the axial depth of the indentations (22) about 0.1 to 0.25 times, preferably about 0.17 to 0.21 times the axial length of the Corresponds to the hub shell. 4. Ventilator nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Einbuchtungen (22) sich zwischen die Basen der Flügelblätter des Flügelrades hinein erstrecken.4. Fan according to one of the preceding claims, characterized in that the indentations (22) extend between the bases of the blades of the impeller. 5. Ventilator nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Anzahl der Einbuchtungen (22) des Nabenmantels der Anzahl seiner Flügelblätter entspricht, wobei vorzugsweise die Längsachse der einzelnen Einbuchtung durch die Mitte der Basis des ihr axial vorgeordneten Flügelblattes hindurchgeht.5. Fan according to one of the preceding claims, characterized in that the number of indentations (22) of the hub shell corresponds to the number of its blades, preferably the longitudinal axis of the individual indentation passes through the center of the base of the axially upstream blade. 6. Ventilator nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Einbuchtungen (22) im axialen Abstand vor der Umfangslinie des Nabenmantels enden, die durch die rückwärtigen Enden der Lüftungsschlitze bestimmt ist und daß die Längsmittellinien der Lüftungsschlitze (25) zu den-Längsmittellinien der Einbuchtungen winkelversetzt sind.6. Fan according to one of the preceding claims, characterized in that the indentations (22) end at an axial distance in front of the circumferential line of the hub shell, which is determined by the rear ends of the ventilation slots and that the longitudinal center lines of the ventilation slots (25) to the longitudinal center lines the indentations are angularly offset. 7. Ventilator nach Anspruch 6, dadurch gekennzeichnet, daß die Breite der axialen Längsschlitze(25)ungefähr dem 0,02- bis 0,03-fachen des Nabenmantelumfanges und ferner die Anzahl der axialen Lüftungsschlitze der Anzahl der Einbuchtungen entspricht.7. Fan according to claim 6, characterized in that the width of the axial longitudinal slots (25) approximately 0.02 to 0.03 times the circumference of the hub shell and also the number of axial ventilation slots corresponds to the number of indentations. 8. Ventilator nach Anspruch 6 oder7, dadurch gekennzeichnet, daß die Länge der Lüftungsschlitze ungefähr dem 0,5- bis 0,7-fachen der axialen Länge des Nabenmantels entspricht.8. Fan according to claim 6 or 7, characterized in that the length of the ventilation slots corresponds approximately to 0.5 to 0.7 times the axial length of the hub shell. 9. Wand- oder Fensterventilator, mit einem den Elektromotor mit Flügelrad enthaltendem Außengehäuse, in welchem eine Motorhalterung zum Halten des Elektromotores angeordnet ist, dadurch gekennzeichnet, daß die Motorhalterung einen Stutzen (50) aufweist, in den das rückwärtige Lagerschild (51) des Elektromotores hineinragt . und daß der Nabenmantel des Flügelrades diesem Stutzen (50) in kleinem Abstand von vorzugsweise max. 8 Millimetern, insbesondere im Abstand von ungefähr 1 bis 5 mm axial gegenübersteht.9. Wall or window fan, with an outer motor containing the electric motor with impeller, in which a motor holder for holding the electric motor is arranged, characterized in that the motor holder has a connecting piece (50) into which the rear bearing plate (51) of the electric motor protrudes. and that the hub shell of the impeller this nozzle (50) at a small distance of preferably max. 8 millimeters, especially at a distance of about 1 to 5 mm axially.
EP82105739A 1981-07-11 1982-06-29 Cooling of the electric motor of an axial ventilator Expired EP0070423B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82105739T ATE14607T1 (en) 1981-07-11 1982-06-29 ELECTRIC MOTOR COOLING OF AN AXIAL FAN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3127518 1981-07-11
DE19813127518 DE3127518A1 (en) 1981-07-11 1981-07-11 AXIAL FAN

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EP0070423A1 true EP0070423A1 (en) 1983-01-26
EP0070423B1 EP0070423B1 (en) 1985-07-31

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EP82105739A Expired EP0070423B1 (en) 1981-07-11 1982-06-29 Cooling of the electric motor of an axial ventilator

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EP (1) EP0070423B1 (en)
AT (1) ATE14607T1 (en)
DE (1) DE3127518A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0452518A1 (en) * 1990-03-22 1991-10-23 Siemens Aktiengesellschaft Cooling system comprising an axial fan driven by an electric motor, particularly for use in a motor vehicle
EP1015764A1 (en) * 1997-08-08 2000-07-05 Bosch Automotive Systems Corporation Axial fan with self-cooled motor
EP2381112A3 (en) * 2010-04-22 2013-01-23 Behr GmbH & Co. KG Axial ventilator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6074181A (en) * 1998-07-09 2000-06-13 Ff Seeley Nominees Pty. Ltd. Shroud for fan motor cooling
DE102009055609A1 (en) 2009-11-25 2011-05-26 Behr Gmbh & Co. Kg Fan for an internal combustion engine
DE102017203731A1 (en) 2017-03-07 2018-09-13 Mahle International Gmbh Fan with motor holder and fan

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GB813062A (en) * 1956-07-13 1959-05-06 Gunnar Frederik Byrn Ventilating fan
GB1060926A (en) * 1964-09-08 1967-03-08 Rotron Mfg Co Fan motor cooling arrangement
US3385516A (en) * 1966-03-31 1968-05-28 Gen Electric Fan construction

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FR1376180A (en) * 1962-12-21 1964-10-23 Electrolux Ab Cooling device for an electric motor-fan unit and assembly provided with said device
FR1433722A (en) * 1965-04-23 1966-04-01 Rotron Mfg Company Built-in motor fan

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB813062A (en) * 1956-07-13 1959-05-06 Gunnar Frederik Byrn Ventilating fan
GB1060926A (en) * 1964-09-08 1967-03-08 Rotron Mfg Co Fan motor cooling arrangement
US3385516A (en) * 1966-03-31 1968-05-28 Gen Electric Fan construction

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0452518A1 (en) * 1990-03-22 1991-10-23 Siemens Aktiengesellschaft Cooling system comprising an axial fan driven by an electric motor, particularly for use in a motor vehicle
EP1015764A1 (en) * 1997-08-08 2000-07-05 Bosch Automotive Systems Corporation Axial fan with self-cooled motor
EP1015764A4 (en) * 1997-08-08 2004-08-11 Bosch Automotive Systems Corp Axial fan with self-cooled motor
EP2381112A3 (en) * 2010-04-22 2013-01-23 Behr GmbH & Co. KG Axial ventilator

Also Published As

Publication number Publication date
DE3127518A1 (en) 1983-01-27
EP0070423B1 (en) 1985-07-31
DE3127518C2 (en) 1989-12-14
ATE14607T1 (en) 1985-08-15

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