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EP0561864B1 - Radial ventilator - Google Patents

Radial ventilator Download PDF

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Publication number
EP0561864B1
EP0561864B1 EP92900338A EP92900338A EP0561864B1 EP 0561864 B1 EP0561864 B1 EP 0561864B1 EP 92900338 A EP92900338 A EP 92900338A EP 92900338 A EP92900338 A EP 92900338A EP 0561864 B1 EP0561864 B1 EP 0561864B1
Authority
EP
European Patent Office
Prior art keywords
fan blades
radial
secondary air
blade ring
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.)
Expired - Lifetime
Application number
EP92900338A
Other languages
German (de)
French (fr)
Other versions
EP0561864A1 (en
Inventor
Wolfgang P. Weinhold
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.)
Weinhold Wolfgang P
Siemens AG
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE9016808U external-priority patent/DE9016808U1/en
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0561864A1 publication Critical patent/EP0561864A1/en
Application granted granted Critical
Publication of EP0561864B1 publication Critical patent/EP0561864B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
    • 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
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type
    • 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 a radial fan according to claim 1.
  • DE-A-2 150 439 describes a blower with an electric motor arranged centrally between two impeller wheels with shaft ends protruding on both sides for receiving a one-piece impeller with a radially outer radial fan blade ring and spokes designed like a propeller-like propeller between this and a shaft-side hub known; the fan wheels arranged axially one behind the other and the central electric motor are completely installed in a common spiral housing.
  • the spiral housing has air guiding devices in such a way that an air flow sucked in axially by the propeller-like propeller from the associated front air inlet opening and pressed axially to the central electric motor is at least partially diverted to the air outlet opening of the spiral housing.
  • CH-A-67 25 31 discloses a radial fan with a fan wheel with radial tandem blading and supporting blading which promotes the main air flow and has obliquely running fan blades between a radially inner hub disk and a radially outer cover ring as a limitation of the radial blading; These measures are intended to counteract flow losses in the deflection zone of the cover ring.
  • the cooling of an electric motor that drives the fan by means of a secondary air flow are not addressed and are, among other things. not possible because of the closed bottom of the fan wheel.
  • GB-A-2 060 069 discloses a radial fan wheel of a radial fan driven by an electric motor with an intermediate piece provided with openings between the remaining spokes between the shaft-side hub and the outer blade ring, the air flow sucked in axially via the electric motor being conveyed by the outer blade ring.
  • a radial fan is also known, the blade ring of which is driven by an external rotor motor, an air channel being formed on the hub base of the blade ring, such that part of the air flow conveyed by the blade ring is fed back to the main air flow as secondary air flow through the air duct and past the outer walls of the external rotor motor.
  • the driving electric motor which also cools the secondary air flow and at the same time does not significantly reduce the main air flow, can be inventively taught of claim 1 can be achieved;
  • the fan wheel which can expediently be produced as a one-piece injection-molded part, without an additional air guiding device on the housing, a secondary air stream which cools the axially downstream electric motor can be fed back to the main air stream in a simple manner.
  • a particularly advantageous air stratification in this sense of the various ventilation flows sucked in and deflected by the fan wheel according to the invention can be achieved in that the spokes in the intermediate piece between the radially inner hub on the one hand and the radially outer concentric blade ring on the other hand in a radially inner spoke Area designed as the secondary air flow through the axially downstream electric motor inner axial fan blade and in a radially outer spoke area as the secondary air flow in a return air duct via the electric motor and then feeding to the blade ring, external diagonal axial fan blades are formed and according to claim 3 is essentially axial extending cylindrical partition between the radially inner axial fan blades on the one hand and the radially outer diagonal axial fan blades on the other hand is arranged.
  • 1, 2 show a known embodiment of a radial fan with a fan wheel 2 fastened to the end of a rotor shaft 11 of an electric motor 1 and molded in one piece from plastic with a radially outer blade ring 22 and a radially inner hub 21 as well as a spoke-like intermediate piece consisting of axial fan blades 24 the hub 21 on the one hand and a support ring 23 receiving the double-flow blade ring 22 on the other.
  • Fig. 3 shows a two-flow fan wheel 3, the intermediate piece between the rotor shaft-side hub 31 on the one hand and the support ring 33 receiving the blade ring 32 on the other hand is formed according to the invention by spoke-like diagonal axial fan blades 34 which suck in a secondary air flow over or through the electric motor 1 and then radially deflect to the blade ring 32 of the fan wheel 3.
  • FIG. 4 shows a fan wheel 4 arranged in a spiral housing 5 with a suction funnel 51 and fastened on the rotor shaft 11 of an electric motor 1.
  • the fan wheel 4 which is injection-molded in one piece from plastic, has axial fan blades 44 in the radial inner region and diagonal axial fan blades 45 in the radial outer region in such a way that an essentially axially directed secondary air flow is sucked out of the suction funnel 51 by the axial fan blades 44 and pressed over or by the electric motor 1 and then via a motor capsule 52 surrounding the outer casing of the electric motor 1 and a spaced-apart motor capsule 52 as an extended part of the spiral casing 5 is conveyed back through the diagonal axial fan blades 45 in the radially outer spoke area to the blade ring 41 of the single-flow fan wheel 4.
  • a cylindrical partition wall 46 as an integral part of the injection molding is advantageously used for air separation Fan wheel 4 provided; the cylindrical partition 46 projects beyond the outer contour of the intermediate piece between the hub 41 and the blade ring 42 in the region of the transition from the axial fan blades 44 to the diagonal axial fan blades 45 by slight axial extensions, so that air short circuits between the intended guidance of the secondary air flow on the one hand and the Main air flow or the recirculated secondary air flow on the other hand can be avoided.

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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)

Abstract

In a ventilator wheel (3 or 4) driven by an electromotor (1), a secondary air flow for cooling the electromotor (1) can be obtained in spite of a very simple construction and without substantially reducing the main air flow, by designing the spokes of the ventilator wheel as diagonal-axial ventilator blades (34) that suck the secondary air flow over or through the electromotor (1), which is arranged downstream of the blades in the axial direction, and that then supply the secondary air flow to the blade ring (34). Alternatively, the spokes are designed in a radially inner area as axial ventilator blades (44) that press the secondary air flow through the electromotor (1), which is arranged downstream of the blades in the axial direction, and in a radially outer area as diagonal-axial ventilator blades (45) that suck the secondary air flow in an air return channel and that then supply the secondary air flow to the blade ring (42).

Description

Die Erfindung bezieht sich auf einen Radiallüfter gemäß Anspruch 1.The invention relates to a radial fan according to claim 1.

Durch die DE-A-2 150 439 ist ein Gebläse mit einem mittig zwischen zwei Gebläserädern angeordneten Elektromotor mit beidendseitig herausragenden Wellenenden zur Aufnahme je eines einstückigen Gebläserades mit einem radial äußeren Radiallüfter-Schaufelkranz und zwischen diesem und einer wellenseitigen Nabe wie eine propellerartige Luftschraube ausgebildeten Speichen bekannt; die axial hintereinander angeordneten Gebläseräder und der mittige Elektromotor sind vollständig in ein gemeinsames Spiralgehäuse eingebaut. Das Spiralgehäuse weist Luftleiteinrichtungen derart auf, daß ein jeweils von der propellerartigen Luftschraube aus der jeweils zugehörigen stirnseitigen Lufteintrittsöffnung axial angesaugter und axial zu dem mittigen Elektromotor gedrückter Luftstrom, zumindest teilweise, zu der Luftaustrittsöffnung des Spiralgehäuses umgeleitet wird.DE-A-2 150 439 describes a blower with an electric motor arranged centrally between two impeller wheels with shaft ends protruding on both sides for receiving a one-piece impeller with a radially outer radial fan blade ring and spokes designed like a propeller-like propeller between this and a shaft-side hub known; the fan wheels arranged axially one behind the other and the central electric motor are completely installed in a common spiral housing. The spiral housing has air guiding devices in such a way that an air flow sucked in axially by the propeller-like propeller from the associated front air inlet opening and pressed axially to the central electric motor is at least partially diverted to the air outlet opening of the spiral housing.

Durch die CH-A-67 25 31 ist ein Radiallüfter mit einem Lüfterrad mit einer radialen Tandembeschaufelung und einer in Richtung des Hauptluftstroms fördernden Stützbeschaufelung mit schräg verlaufenden Lüfterschaufeln zwischen einer radial inneren Nabenscheibe und einem radial äußeren Abdeckring als Begrenzung der Radialbeschaufelung bekannt; durch diese Maßnahmen soll Strömungsverlusten in der Umlenkzone des Abdeckringes entgegengewirkt werden. Die Kühlung eines den Lüfter antreibenden Elektromotors durch einen Nebenluftstrom werden nicht angesprochen und sind u.a. wegen des geschlossenen Bodens des Lüfterrades auch nicht möglich.CH-A-67 25 31 discloses a radial fan with a fan wheel with radial tandem blading and supporting blading which promotes the main air flow and has obliquely running fan blades between a radially inner hub disk and a radially outer cover ring as a limitation of the radial blading; These measures are intended to counteract flow losses in the deflection zone of the cover ring. The cooling of an electric motor that drives the fan by means of a secondary air flow are not addressed and are, among other things. not possible because of the closed bottom of the fan wheel.

Durch die GB-A-2 060 069 ist ein von einem Elektromotor angetriebenes Radiallüfterrad eines Radialventilators mit einem mit Durchbrechungen zwischen verbleibenden Speichen versehenen Zwischenstück zwischen wellenseitiger Nabe und äußerem Schaufelkranz bekannt, wobei der über den Elektromotor axial angesaugte Luftstrom von dem äußeren Schaufelkranz gefördet wird.GB-A-2 060 069 discloses a radial fan wheel of a radial fan driven by an electric motor with an intermediate piece provided with openings between the remaining spokes between the shaft-side hub and the outer blade ring, the air flow sucked in axially via the electric motor being conveyed by the outer blade ring.

Durch die FR-A-2 209 410, Fig.2;3 ist weiterhin ein Radialventilator bekannt, dessen Schaufelkranz von einem Außenläufermotor angetrieben wird, wobei an dem Nabenboden des Schaufelkranzes ein Luftkanal angeformt ist, derart daß ein Teil des von dem Schaufelkranz geförderten Luftstroms als Nebenluftstrom durch den Luftkanal und an den Außenwandungen des Außenlaufmotors vorbei dem Hauptluftstrom wieder zugeführt wird.From FR-A-2 209 410, Fig. 2; 3, a radial fan is also known, the blade ring of which is driven by an external rotor motor, an air channel being formed on the hub base of the blade ring, such that part of the air flow conveyed by the blade ring is fed back to the main air flow as secondary air flow through the air duct and past the outer walls of the external rotor motor.

Ein demgegenüber trotz geringen Fertigungs- und Montageaufwandes den antreibenden Elektromotor durch einen Nebenluftstrom mitkühlender und gleichzeitig den Hauptluftstrom nicht wesentlich vermindernder Radiallüfter kann erfindungsgemäß durch die Lehre des Anspruchs 1 erreicht werden; datei kann durch das zweckmäßigerweise als einstückiges Spritzgußteil herstellbare Lüfterrad ohne Zusatz-Luftleiteinrichtung am Gehäuse auf einfache Weise ein zur Kühlung des axial nachgeordneten Elektromotors kühlender Nebenluftstrom dem Hauptluftstrom wieder zugeführt werden.In contrast to this, despite the low manufacturing and assembly effort, the driving electric motor, which also cools the secondary air flow and at the same time does not significantly reduce the main air flow, can be inventively taught of claim 1 can be achieved; By means of the fan wheel, which can expediently be produced as a one-piece injection-molded part, without an additional air guiding device on the housing, a secondary air stream which cools the axially downstream electric motor can be fed back to the main air stream in a simple manner.

Eine in diesem Sinne besonders vorteilhafte Luftschichtung der durch das erfindungsgemäße Lüfterrad angesaugten und umgelenkten verschiedenen Lüftströmungen kann dadurch erreicht werden, daß gemäß Anspruch 2 die Speichen in dem Zwischenstück zwischen der radial inneren Nabe einerseits und dem radial äußeren konzentrischen Schaufelkranz andererseits in einem radial inneren Speichen-Bereich als den Nebenluftstrom durch den axial nachgeordneten Elektromotor drückende innere Axiallüfterschaufel und in einem radial äußeren Speichen-Bereich als den Nebenluftstrom in einem Rückluftkanal über den Elektromotor saugende und anschließend dem Schaufelkranz zuführende äußere Diagonal-Axiallüfterschaufeln ausgebildet sind und gemäß Anspruch 3 eine im wesentlichen sich axial erstreckende zylindrische Trennwand zwischen den radial inneren Axiallüfterschaufeln einerseits und den radial äußeren Diagonal-Axiallüfterschaufeln andererseits angeordnet ist.A particularly advantageous air stratification in this sense of the various ventilation flows sucked in and deflected by the fan wheel according to the invention can be achieved in that the spokes in the intermediate piece between the radially inner hub on the one hand and the radially outer concentric blade ring on the other hand in a radially inner spoke Area designed as the secondary air flow through the axially downstream electric motor inner axial fan blade and in a radially outer spoke area as the secondary air flow in a return air duct via the electric motor and then feeding to the blade ring, external diagonal axial fan blades are formed and according to claim 3 is essentially axial extending cylindrical partition between the radially inner axial fan blades on the one hand and the radially outer diagonal axial fan blades on the other hand is arranged.

Die Erfindung sowie weitere vorteilhafte Ausgestaltungen der Erfindung gemäß Merkmalen weiterer Unteransprüche werden im folgenden anhand schematisch dargestellter Ausführungsbeispiele in der Zeichnung näher erläutert; darin zeigen

FIG 1
in einem axialen Teilschnittbild einen bekannten Radiallüfter mit Axiallüfterschaufeln als Speichen zwischen einer radial inneren Nabe einerseits und einem radial äußeren, dazu konzentrischen Radiallüfter-Schaufelkranz andererseits,
FIG 2
eine axiale Draufsicht auf den Radiallüfter gemäß FIG 1
FIG 3
in einem ersten Teilschnittbild einen erfindungsgemäßen Radiallüfter mit Diagonal-Axiallüfterschaufeln zwischen der läuferwellenseitigen Nabe einerseits und dem Schaufelkranz andererseits,
FIG 4
einen zweiten erfindungsgemäßen Radiallüfter mit einem Zwischenstück zwischen der läuferwellenseitigen Nabe einerseits und dem Schaufelkranz andererseits, das in einem radial inneren Bereich aus den Nebenluftstrom über den Elektromotor drückenden Axiallüfter-Schaufeln und in einem radial äußeren Bereich aus den Nebenluftstrom zu dem Schaufelkranz rückführenden Diagonal-Axiallüfterschaufeln besteht.
The invention and further advantageous refinements of the invention according to the features of further subclaims are explained in more detail below with reference to schematically illustrated exemplary embodiments in the drawing; show in it
FIG. 1
in a partial axial sectional view, a known radial fan with axial fan blades as spokes between a radially inner hub on the one hand and a radially outer, concentric radial fan blade ring on the other,
FIG 2
an axial plan view of the radial fan according to FIG. 1
FIG 3
In a first partial sectional view, a radial fan according to the invention with diagonal axial fan blades between the hub on the rotor shaft side on the one hand and the blade ring on the other hand,
FIG 4
a second radial fan according to the invention with an intermediate piece between the hub on the rotor shaft side on the one hand and the blade ring on the other hand, which consists in a radially inner area of the secondary air flow via the electric motor pushing the axial fan blades and in a radially outer area of the secondary air flow returning to the blade ring diagonal axial fan blades .

Fig. 1, 2 zeigen eine bekannte Ausführung eines Radiallüfters mit auf dem Ende einer Läuferwelle 11 eines Elektromotors 1 befestigtes, einstückig aus Kunststoff gespritztes Lüfterrad 2 mit einem radial äußeren Schaufelkranz 22 und einer radial inneren Nabe 21 sowie einem aus Axiallüfterschaufeln 24 bestehenden speichenartigen Zwischenstück zwischen der Nabe 21 einerseits und einem den doppelflutigen Schaufelkranz 22 aufnehmenden Tragring 23 andererseits. Bei Rotation der Läuferwelle 11 wird ein Hauptluftstrom axial durch einen hier nicht gezeigten Ansaugtrichter eines das Lüfterrad umgebenden Spiralgehäuses angesaugt und radial zu dem Schaufelkranz 22 umgelenkt und durch die Axiallüfterschaufeln 24 gleichzeitig ein zusätzlicher, im wesentlichen axial gerichteter Kühlluftstrom über den Elektromotor 1 gedrückt.1, 2 show a known embodiment of a radial fan with a fan wheel 2 fastened to the end of a rotor shaft 11 of an electric motor 1 and molded in one piece from plastic with a radially outer blade ring 22 and a radially inner hub 21 as well as a spoke-like intermediate piece consisting of axial fan blades 24 the hub 21 on the one hand and a support ring 23 receiving the double-flow blade ring 22 on the other. When the rotor shaft 11 rotates, a main air flow is sucked in axially through a suction funnel (not shown here) of a spiral housing surrounding the fan wheel and deflected radially to the blade ring 22, and an additional, essentially axially directed cooling air flow is simultaneously pressed via the electric motor 1 by the axial fan blades 24.

Fig. 3 zeigt ein zweiflutiges Lüfterrad 3, dessen Zwischenstück zwischen der läuferwellenseitigen Nabe 31 einerseits und dem den Schaufelkranz 32 aufnehmenden Tragring 33 andererseits erfindungsgemäß durch speichenartige Diagonal-Axiallüfterschaufeln 34 gebildet wird, die einen Nebenluftstrom über bzw. durch den Elektromotor 1 ansaugen und anschließend radial zu dem Schaufelkranz 32 des Lüfterrades 3 umlenken.Fig. 3 shows a two-flow fan wheel 3, the intermediate piece between the rotor shaft-side hub 31 on the one hand and the support ring 33 receiving the blade ring 32 on the other hand is formed according to the invention by spoke-like diagonal axial fan blades 34 which suck in a secondary air flow over or through the electric motor 1 and then radially deflect to the blade ring 32 of the fan wheel 3.

Figur 4 zeigt einen in einem Spiralgehäuse 5 mit Ansaugtrichter 51 angeordnetes, auf der Läuferwelle 11 eines Elektromotor 1 befestigtes Lüfterrad 4. Das einstückig aus Kunststoff gespritzte Lüfterrad 4 weist in einem radial inneren Bereich speichenartige Axiallüfterschaufeln 44 und in einem radial äußeren Speichenbereich Diagonal-Axiallüfterschaufeln 45 derart auf, daß von den Axiallüfterschaufeln 44 ein im wesentlichen axial gerichteter Nebenluftstrom aus dem Ansaugtrichter 51 angesaugt und über bzw. durch den Elektromotor 1 gedrückt und anschließend über einen durch das Außengehäuse des Elektromotors 1 und eine in Abstand umgebende Motorkapsel 52 als verlängerter Teil des Spiralgehäuses 5 durch die Diagonal-Axiallüfterschaufeln 45 im radial äußeren Speichen-Bereich zum Schaufelkranz 41 des einflutigen Lüfterrades 4 zurückgefördert wird.FIG. 4 shows a fan wheel 4 arranged in a spiral housing 5 with a suction funnel 51 and fastened on the rotor shaft 11 of an electric motor 1. The fan wheel 4, which is injection-molded in one piece from plastic, has axial fan blades 44 in the radial inner region and diagonal axial fan blades 45 in the radial outer region in such a way that an essentially axially directed secondary air flow is sucked out of the suction funnel 51 by the axial fan blades 44 and pressed over or by the electric motor 1 and then via a motor capsule 52 surrounding the outer casing of the electric motor 1 and a spaced-apart motor capsule 52 as an extended part of the spiral casing 5 is conveyed back through the diagonal axial fan blades 45 in the radially outer spoke area to the blade ring 41 of the single-flow fan wheel 4.

In vorteilhafter Weise ist zur lufttechnischen Trennung des den Elektromotor 1 kühlenden Nebenluftstromes einerseits und des direkt vom Einführungstrichter 51 in den Schaufelkranz 42 eintretenden Hauptluftstromes bzw. des nach der Kühlung des Elektromotors 1 durch den Rückluftkanal zurückgeförderten Nebenluftstromes andererseits eine zylindrische Trennwand 46 als einstückig mitgespritzter Bestandteil des Lüfterrades 4 vorgesehen; die zylindrische Trennwand 46 überragt die Außenkontur des Zwischenstückes zwischen der Nabe 41 und dem Schaufelkranz 42 im Bereich des Überganges von den Axiallüfterschaufeln 44 zu den Diagonal-Axiallüfterschaufeln 45 um geringe axiale Erstreckungen, so daß Luft-Kurzschlüsse zwischen der vorgesehenen Führung des Nebenluftstroms einerseits und des Hauptluftstroms bzw. des rückgeführten Nebenluftstroms andererseits vermeidbar sind.In order to separate the secondary air flow cooling the electric motor 1 on the one hand and the main air flow entering the blade ring 42 directly from the introduction funnel 51 or the secondary air flow conveyed back through the return air duct after the cooling of the electric motor 1, on the other hand, a cylindrical partition wall 46 as an integral part of the injection molding is advantageously used for air separation Fan wheel 4 provided; the cylindrical partition 46 projects beyond the outer contour of the intermediate piece between the hub 41 and the blade ring 42 in the region of the transition from the axial fan blades 44 to the diagonal axial fan blades 45 by slight axial extensions, so that air short circuits between the intended guidance of the secondary air flow on the one hand and the Main air flow or the recirculated secondary air flow on the other hand can be avoided.

Claims (6)

  1. Radial fan having an impeller (3 or 4) which is driven by an internal-rotor electric motor (1), having a principal air stream, which is delivered by the internal rotor by way of a radially outer radial-fan blade ring (32 or 42), and a secondary air stream which is delivered by way of axial fan blades, designed as spokes between a hub (31 or 41) on the rotor shaft and the radial-fan blade ring (32 or 42), and is intended for cooling the internal-rotor electric motor (1), the spokes being designed as diagonal axial fan blades (34) which take in the secondary air flow via or through the axially downstream electric motor (1) and then feed it to the blade ring (32).
  2. Radial fan according to Claim 1, the spokes being designed, in a radially inner spoke region, as axial fan blades (44) which force the secondary air stream through the axially downstream electric motor (1) and, in a radially outer spoke region, as outer diagonal axial fan blades (45) which take in the secondary air stream in a return-air duct via the electric motor (1) and then feed it to the blade ring (42).
  3. Radial fan according to Claim 2, an essentially axially extending cylindrical partition wall (46) being provided between the radially inner axial fan blades (44), on the one hand, and the radially outer diagonal axial fan blades (45), on the other hand.
  4. Radial fan according to Claim 3, the cylindrical partition wall (46) being connected, as a single-piece constituent part, to the inner axial fan blades (44) and to the outer diagonal axial fan blades (45).
  5. Radial fan according to Claim 3 or 4, the cylindrical partition wall (46) projecting, by a slight axial extent, beyond the outer contour of the intermediate piece between the hub (41) and the blade ring (42), in the region of the transition from the axial fan blades (44) to the diagonal fan blades (45), with the effect of avoiding air short circuits between the principal air stream, on the one hand, and the secondary air stream, on the other hand.
  6. Radial fan according to one of Claims 1-5, the hub, the spokes, the blade ring and, if appropriate, the cylindrical partition wall each being a constituent part of a single-piece injection-moulded part, in particular of a plastic injection-moulded part.
EP92900338A 1990-12-12 1991-12-10 Radial ventilator Expired - Lifetime EP0561864B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE9016808U DE9016808U1 (en) 1990-12-12 1990-12-12 Radial fan
EP90123947 1990-12-12
DE9016808U 1990-12-12
EP90123947 1990-12-12
PCT/EP1991/002369 WO1992010682A1 (en) 1990-12-12 1991-12-10 Radial ventilator

Publications (2)

Publication Number Publication Date
EP0561864A1 EP0561864A1 (en) 1993-09-29
EP0561864B1 true EP0561864B1 (en) 1995-03-08

Family

ID=25957511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92900338A Expired - Lifetime EP0561864B1 (en) 1990-12-12 1991-12-10 Radial ventilator

Country Status (3)

Country Link
EP (1) EP0561864B1 (en)
DE (1) DE59104914D1 (en)
WO (1) WO1992010682A1 (en)

Cited By (1)

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EP0561864A1 (en) 1993-09-29
DE59104914D1 (en) 1995-04-13
WO1992010682A1 (en) 1992-06-25

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