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EP2076661B1 - Axial fan for conveying cooling air for a cooling device of a motor vehicle - Google Patents

Axial fan for conveying cooling air for a cooling device of a motor vehicle Download PDF

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Publication number
EP2076661B1
EP2076661B1 EP07818176.5A EP07818176A EP2076661B1 EP 2076661 B1 EP2076661 B1 EP 2076661B1 EP 07818176 A EP07818176 A EP 07818176A EP 2076661 B1 EP2076661 B1 EP 2076661B1
Authority
EP
European Patent Office
Prior art keywords
axial
axial fan
ring
shroud
fan according
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.)
Not-in-force
Application number
EP07818176.5A
Other languages
German (de)
French (fr)
Other versions
EP2076661A1 (en
Inventor
Uwe Blass
Ulrich Vollert
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.)
Mahle Behr GmbH and Co KG
Original Assignee
Mahle Behr GmbH and Co KG
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
Application filed by Mahle Behr GmbH and Co KG filed Critical Mahle Behr GmbH and Co KG
Publication of EP2076661A1 publication Critical patent/EP2076661A1/en
Application granted granted Critical
Publication of EP2076661B1 publication Critical patent/EP2076661B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/12—Filtering, cooling, or silencing cooling-air
    • 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
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
    • F04D29/164—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of an axial flow wheel
    • 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
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
    • F04D29/526—Details of the casing section radially opposing blade tips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • 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

Definitions

  • the invention relates to an axial fan according to the preamble of claim 1 and an axial fan with an inlet nozzle according to the preamble of the independent claim 14, known by the DE 33 04 297 C2 the applicant.
  • Axial fan for conveying cooling air for cooling devices, in particular cooling modules in motor vehicles are known, for. B. as an axial fan with free-standing blade tips, which rotate in a stationary Zargenring a fan cowl.
  • jacket fans in which a jacket is connected to the blade tips of the fan blades and rotates with the fan. Due to the circumferential jacket, blade tip losses, which arise from a flow around the blade tips as a result of the pressure differences on the pressure and suction sides of the fan blades, are avoided.
  • the fan is driven by the internal combustion engine of the motor vehicle and is mounted relative to the block of the internal combustion engine.
  • the cooling device consisting of heat exchangers, z.
  • the applicant has a cooling device with a motor-side driven and supported axial fan is known, which rotates in a motor-fixed Zargenring.
  • the fan flow ie the main flow generated by the fan, is superimposed on a bypass flow in the blade tip area.
  • the axial depth of the known cooling device is relatively large, in particular because of the fan upstream annular bypass channel for generating the bypass flow.
  • the applicant has known a so-called shell fan with an inlet nozzle, wherein the fan and the inlet nozzle fixed to the engine, that are supported on the internal combustion engine of the motor vehicle.
  • the jacket is attached to axial vanes of the fan and projects into the inlet nozzle with a forwardly extended cylindrical portion, creating a gap flow with a 180 degree deflection from the pressure side of the fan to the suction side.
  • the upstream inlet nozzle also results in a relatively large axial length.
  • the effective fan cross-section is reduced by the radially inwardly projecting inlet nozzle, whereby the delivery capacity of the fan is limited.
  • the leading edge of the jacket is set back in the direction of flow with respect to the leading edges of the fan blades (also referred to below as fan blades), ie. H. the shroud extends in the axial direction only over a part of the fan blade depth, via the downstream part.
  • a fixed guide ring is arranged in this region of the reset of the shell, which preferably has a reduced diameter relative to the shroud.
  • the fixed Zargenring is thus arranged in the flow direction in front of the shroud and radially within the shroud.
  • the Zargenring may be formed substantially cylindrical or conical with an extension in the flow direction or be provided with a bell-shaped or funnel-shaped inlet region, which is preferably arranged opposite to the L compellingeranströmkanten offset from the flow direction.
  • a deflecting element is arranged on the Zargenring in the region of the leading edge of the shroud, which generates a directed against the main flow through the axial fan gap flow.
  • the annular deflecting element is extended by an annular surface extending in the direction of flow of the main flow which forms an annular gap with the outer lateral surface of the lateral ring.
  • the formation of an effective gap flow is supported, which stabilizes the main flow in the blade tip area, ie within the shell.
  • a radially outflow of the outlet flow is favored in a sheath ring which widens in the downstream direction and a ring surface which widens in parallel. This is in an axially limited space - due to a downstream of the fan arranged engine block of the motor vehicle - of particular advantage.
  • a radial outflow can be provided on the annular surface Strömungsleitiata, preferably in the form of a radial Nachleitapparates.
  • the invention with the aforementioned embodiments thus provides only a partial sheathing of the fan blades with respect to the blade depth due to the resetting of the shell relative to the blade leading edges, wherein in the non-jacketed region, the region of the reset, the fixed Zargenring is arranged.
  • the object of the invention is also achieved by an axial fan with the features of the independent claim 13.
  • the axial fan according to the invention has a projecting, projecting into an inlet nozzle shroud, whereby the gap flow known from the prior art with a 180-degree deflection for flow stabilization is achieved.
  • the axial fan according to the invention has a freestanding front and blade tip edge, ie, a gap in the form of a gusset is left between the upstream blade tip region and the inner surface of the jacket ring.
  • the fan blades can thus be better flown in the front and outermost region, ie with lower losses, which result from a Fehlanströmung by the gap or nozzle flow.
  • the Fehlanströmung is caused by a relation to the main flow higher speed of the slit or nozzle flow, which also has a peripheral component.
  • a disadvantage of the prior art is eliminated by a free, leading blade tip edge. Nevertheless, the stabilizing effect of the nozzle flow is maintained.
  • Fig. 1 shows an axial fan 1, which is mounted on a clutch 2, preferably a fluid friction clutch against an internal combustion engine, not shown, of a motor vehicle and driven by this.
  • the axial fan 1 is part of a cooling device, which heat exchanger, not shown, for. B. may have a coolant radiator, a charge air cooler and a refrigerant condenser.
  • the axial fan 1 is flown in the direction of an arrow L of air, is preferably arranged in the flow direction behind the heat transfer, not shown, and sucks ambient air through the heat exchanger.
  • the axial fan 1 is connected via a fan shroud, not shown, for guiding the cooling air with the upstream heat exchangers.
  • the axial fan 1 has a hub 3 connected to the clutch 2 and axial blades 4 with a front edge 4 a and a trailing edge 4 b.
  • the axis of rotation of the fan is designated by a.
  • the axial blades 4 have a blade depth t which extends from the leading edge 4a to the trailing edge 4b.
  • the blades 4 have blade tips (blade tips) 4c, to which a shroud 5 with a leading edge 5a and a trailing edge 5b is attached.
  • the leading edge 5a is offset from the leading edges 4a of the fan blades 4 by an amount X1 in the flow direction L, while the trailing edge 5b is offset from the trailing edge 4b counter to the flow direction by an amount X2.
  • the axial extent I of the shroud 5 is thus smaller than the blade depth t.
  • the area of the blade tips 4c, which is in the flow direction in front of the leading edge 5a, ie the area X1 of the resetting of the leading edge 5a has a reduced diameter D1.
  • a corner region of the blade tips 4c is recessed, in which a stationary arranged guide ring 6 is arranged, wherein the guide ring 6 has a mean diameter D2, which is greater than the diameter D1, but smaller than the diameter of the leading edge 5a.
  • the guide ring 6 is formed substantially cylindrical, overlaps in the axial direction with the axial blades 4 and is slightly opposite to the leading edges 4a, d. H,. opposite to the flow direction L.
  • the guide ring 6 is preferably arranged fixed motor, ie, as well as the axial fan 1, ie between the rotating fan 1 and the fixed guide ring 6 occur no relative movements, so that a minimal gap can be realized.
  • Fig. 2 shows a fan 7, the a modification of the fan 1 according to Fig. 1 represents, wherein the same reference numerals are used for the same parts as before.
  • the fan 7 substantially corresponds to the fan 1, thus has a similar Axialbeschaufelung 4 and a similar shroud 5 on.
  • a stationary guide ring 8 is arranged, which is conical or diffuser-like in design, ie widens in the flow direction L.
  • the recessed blade tip region 4 c is adapted to the conical shape of the guide ring 8. Due to the diffuser-shaped guide ring 8, the substantially semiaxially oriented main flow of the fan 7 is taken into account, so that the flow is already given a radial component.
  • FIG. 3 shows a further embodiment of the invention, in which an axial fan 9 has a jacket 10 with a protruding, cylindrical portion 10a, which projects into a U-shaped or C-shaped inlet nozzle 11 in cross-section.
  • a jacket fan with inlet nozzle is known from the aforementioned prior art and generates a gap or nozzle flow, which is superimposed in the blade tip region of the main flow and ensures stabilization of the main flow.
  • the leading edges 4a of the fan blades 4 do not extend to the inner surface of the shell 10, whereby a gap s in the form of a gusset is formed.
  • the fan blade 4 has, in the upstream region, a free blade tip edge 12 which delimits the gusset s and can be flowed freely by the nozzle flow formed by the inlet nozzle 11. Due to the free blade tip edge 12 and the radially inwardly retracted blade leading edge 4a a Fehlanströmung is avoided by the affected with a peripheral component gap flow.
  • Fig. 4 shows a further embodiment of the invention for a fan 13, which substantially the fans 1 and 7 of the embodiments according to Fig. 1 and Fig. 2 equivalent.
  • the guide ring 14 which widens conically or bell-shaped counter to the flow direction L and thus forms an inlet funnel for the incoming air.
  • the withdrawn blade tip region 4c is adapted to this shape of the guide ring 14 accordingly.
  • Fig. 5 shows a further modification of the previous embodiment, ie for a fan 13, the shroud 5, a fixed guide ring 15 is connected upstream, which has at its air inlet region a radially inwardly extending aperture ring 15a.
  • the aperture ring 15a covers the radial gap between the guide ring 15 and the blade tip portion 4c of the axial blades 4.
  • Fig. 6 shows a further embodiment of the invention with an axial fan 16, which axial blades 4 and a shroud 5 has.
  • a guide ring 17, slightly conical and diffuser-like design, is connected upstream of the jacket ring 5 and has a leading edge 17a and an outflow edge 17b.
  • a radial gap 18 is left, to which an annular deflecting element 19 attached to the guide ring 17 is assigned.
  • FIG. 7 shows a further embodiment of the invention, which is a development of the embodiment according to Fig. 6 represents.
  • An axial fan 20 has a Axialbeschaufelung 4 with a shroud 5 and an upstream guide ring 21, on which in addition to the annular deflecting element 19 in the axial and radial direction, parallel to the shroud 5 extending annular surface 22 connects.
  • the main flow of the fan 20 is represented by three flow arrows P1, P2, P3, while a gap or nozzle flow is indicated by a fourth arrow P4.
  • annular gap 23 Between the outer surface of the jacket ring 5 and the annular surface 22 is an annular gap 23 through which air flows from the pressure side of the fan counter to the main flow direction, is deflected in the deflecting element 19 and through the radial gap 18 in the fan 20, ie the Axialbeschaufelung 4 occurs.
  • This gap or nozzle flow indicated by the arrow P4, has a stabilizing effect on the main flow in the fan.
  • the geometry of the guide ring 21 and the shroud 5 is such that a diffuser effect results, whereby the main flow P1, P2, P3 is deflected in a radial direction. This is at the cramped space in the motor vehicle in the axial direction, in particular by the downstream arranged, not shown engine block of great advantage.
  • Fig. 8 shows a development of the embodiment according to Fig. 7 , wherein the annular surface 22 is further extended in the axial and radial directions and carries flow guide elements 24, which cause a radial orientation of the fan outflow.
  • the flow guide elements 24 may be formed in the manner of a radial Nachleitapparates, as described in the earlier application of the Applicant with the official file number xy ... (Sign of the Applicant: 06-B-060).
  • Fig. 9 shows a representation of the fan flow for an axial fan according to the prior art.
  • the main flow is directed semi-axially, as indicated by parallel arrows P.
  • In the upstream blade tip region forms a vortex W, which disturbs the main flow and deteriorates the efficiency of the fan.
  • Fig. 10 shows a known from the prior art shell fan with so-called inlet nozzle, through which a nozzle flow, represented by the two outermost arrows D, is generated.
  • a nozzle flow represented by the two outermost arrows D.
  • the vortex W is eliminated by the nozzle flow D.
  • a stable flow is achieved even in the blade tip area.
  • Fig. 11 shows a further flow pattern for the axial fan 1 according to the invention according to the embodiment according to Fig. 1 ,
  • the flow through the Axialbeschaufelung 4 runs according to the arrows in the half-axial direction.
  • a nozzle flow is formed, which is indicated by the outermost arrow F.

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

Description

Die Erfindung betrifft einen Axiallüfter nach dem Oberbegriff des Patentanspruches 1 sowie einen Axiallüfter mit einer Einlaufdüse nach dem Oberbegriff des nebengeordneten Patentanspruches 14, bekannt durch die DE 33 04 297 C2 der Anmelderin.The invention relates to an axial fan according to the preamble of claim 1 and an axial fan with an inlet nozzle according to the preamble of the independent claim 14, known by the DE 33 04 297 C2 the applicant.

Axiallüfter zur Förderung von Kühlluft für Kühlvorrichtungen, insbesondere Kühlmodule in Kraftfahrzeugen, sind bekannt, z. B. als Axiallüfter mit frei stehenden Blattspitzen, welche in einem feststehenden Zargenring einer Lüfterzarge umlaufen. Bekannt sind auch so genannte Mantellüfter, bei welchen ein Mantel mit den Blattspitzen der Lüfterblätter verbunden ist und mit dem Lüfter umläuft. Durch den umlaufenden Mantel werden Blattspitzenverluste, welche aus einer Umströmung der Blattspitzen infolge der Druckunterschiede auf der Druck- und Saugseite der Lüfterblätter entstehen, vermieden. Bei größeren Kraftfahrzeugen, insbesondere bei Nutzfahrzeugen wird der Lüfter von der Brennkraftmaschine des Kraftfahrzeuges angetrieben und ist gegenüber dem Block der Brennkraftmaschine gelagert. Die Kühlvorrichtung dagegen, bestehend aus Wärmeübertragern, z. B. Kühlmittel- oder Ladeluftkühlern, ist fahrzeugseitig abgestützt, während der Motor elastisch gegenüber dem Fahrzeugrahmen gelagert ist. Daraus ergeben sich Relativbewegungen zwischen dem Lüfter und der Kühlvorrichtung bzw. einer an der Kühlvorrichtung befestigten Lüfterzarge. Die Relativbewegung zwischen den motorfesten Teilen wie z. B. der Lüfter und den fahrzeugfesten Teilen wie z. B. die Lüfterzarge oder der Lüfterzargenring werden daher durch elastische, flexible Ausgleichselemente kompensiert.Axial fan for conveying cooling air for cooling devices, in particular cooling modules in motor vehicles, are known, for. B. as an axial fan with free-standing blade tips, which rotate in a stationary Zargenring a fan cowl. Also known are so-called jacket fans, in which a jacket is connected to the blade tips of the fan blades and rotates with the fan. Due to the circumferential jacket, blade tip losses, which arise from a flow around the blade tips as a result of the pressure differences on the pressure and suction sides of the fan blades, are avoided. For larger vehicles, especially commercial vehicles, the fan is driven by the internal combustion engine of the motor vehicle and is mounted relative to the block of the internal combustion engine. The cooling device, however, consisting of heat exchangers, z. As coolant or intercoolers, is supported on the vehicle side, while the engine is mounted elastically relative to the vehicle frame. This results in relative movements between the fan and the cooling device or attached to the cooling fan shroud. The relative movement between the engine-fixed parts such. B. the fan and the vehicle-fixed parts such. As the fan cowl or fan shell ring are therefore compensated by elastic, flexible compensation elements.

Durch die DE 44 38 184 C1 der Anmelderin wurde eine Kühlvorrichtung mit einem motorseitig angetriebenen und abgestützten Axiallüfter bekannt, welcher in einem motorfesten Zargenring umläuft. Eine in Strömungsrichtung vor dem Axiallüfter angeordnete Kühlvorrichtung, bestehend aus einem Kühler mit Kühler- oder Lüfterzarge, ist über eine elastische ringförmige Lippendichtung mit dem feststehenden Zargenring verbunden. Der Lüfterströmung, d. h. der vom Lüfter erzeugten Hauptströmung ist im Blattspitzenbereich eine Bypassströmung überlagert. Die axiale Bautiefe der bekannten Kühlvorrichtung ist insbesondere wegen des dem Lüfter vorgeschalteten ringförmigen Bypasskanals zur Erzeugung der Bypassströmung relativ groß.By the DE 44 38 184 C1 the applicant has a cooling device with a motor-side driven and supported axial fan is known, which rotates in a motor-fixed Zargenring. An arranged in the flow direction in front of the axial fan cooling device, consisting of a cooler with radiator or fan cowl, is connected via a resilient annular lip seal with the stationary Zargenring. The fan flow, ie the main flow generated by the fan, is superimposed on a bypass flow in the blade tip area. The axial depth of the known cooling device is relatively large, in particular because of the fan upstream annular bypass channel for generating the bypass flow.

Durch die DE 33 04 297 C2 der Anmelderin wurde ein so genannter Mantellüfter mit einer Einlaufdüse bekannt, wobei der Lüfter und die Einlaufdüse motorfest, d. h. an der Brennkraftmaschine des Kraftfahrzeuges abgestützt sind. Der Mantel ist an Axialschaufeln des Lüfters befestigt und ragt mit einem nach vorne verlängerten, zylindrischen Bereich in die Einlaufdüse hinein, wodurch eine Spaltströmung mit einer 180-Grad-Umlenkung von der Druckseite des Lüfters zur Saugseite erzeugt wird. Wegen der vorgeschalteten Einlaufdüse ergibt sich auch hier eine relativ große axiale Baulänge. Darüber hinaus wird der wirksame Lüfterquerschnitt durch die radial nach innen ragende Einlaufdüse vermindert, wodurch die Förderleistung des Lüfters eingeschränkt wird.By the DE 33 04 297 C2 the applicant has known a so-called shell fan with an inlet nozzle, wherein the fan and the inlet nozzle fixed to the engine, that are supported on the internal combustion engine of the motor vehicle. The jacket is attached to axial vanes of the fan and projects into the inlet nozzle with a forwardly extended cylindrical portion, creating a gap flow with a 180 degree deflection from the pressure side of the fan to the suction side. Because of the upstream inlet nozzle also results in a relatively large axial length. In addition, the effective fan cross-section is reduced by the radially inwardly projecting inlet nozzle, whereby the delivery capacity of the fan is limited.

Bei heutigen Kraftfahrzeugen steht für den Einbau von Kühlvorrichtungen einschließlich Lüfter wenig Bauraum zur Verfügung, andererseits steigen die Anforderungen in Bezug auf die zu erbringende Kühlleistung und damit auch auf die Lüfterleistung.In today's motor vehicles is for the installation of cooling devices including fans little space available, on the other hand, the requirements increase in terms of the cooling performance to be provided and thus on the fan performance.

Ein ähnlicher Axiallüfter wird in US 6 027 307 offenbart.A similar axial fan will be in US Pat. No. 6,027,307 disclosed.

Es ist Aufgabe der Erfindung, einen Axiallüfter der eingangs genanten Art hinsichtlich seiner Förderleistung bei einem beschränkten Bauraum zu verbessern.It is an object of the invention to improve an axial fan of the type mentioned in terms of its capacity in a limited space.

Diese Aufgabe wird durch die Merkmale der Patentansprüche 1 gelöst.This object is solved by the features of claims 1.

Erfindungsgemäß ist die Anströmkante des Mantels gegenüber den Vorderkanten der Lüfterschaufeln (im Folgenden auch Lüfterblätter genannt) in Strömungsrichtung zurückgesetzt, d. h. der Mantelring erstreckt sich in axialer Richtung nur über einen Teil der Lüfterblatttiefe, und zwar über den stromabwärts gelegenen Teil. Vorzugsweise ist in diesem Bereich der Zurücksetzung des Mantels ein feststehender Leitring angeordnet, welcher vorzugsweise einen gegenüber dem Mantelring reduzierten Durchmesser aufweist. Der feststehende Zargenring ist somit in Strömungsrichtung vor dem Mantelring und radial innerhalb des Mantelringes angeordnet. Damit wird der Vorteil einer Strömungsstabilisierung im Blattspitzenbereich erreicht, verbunden mit einem erhöhten Wirkungsgrad und geringerer Geräuschentwicklung.According to the invention, the leading edge of the jacket is set back in the direction of flow with respect to the leading edges of the fan blades (also referred to below as fan blades), ie. H. the shroud extends in the axial direction only over a part of the fan blade depth, via the downstream part. Preferably, a fixed guide ring is arranged in this region of the reset of the shell, which preferably has a reduced diameter relative to the shroud. The fixed Zargenring is thus arranged in the flow direction in front of the shroud and radially within the shroud. Thus, the advantage of a flow stabilization in the blade tip area is achieved, combined with increased efficiency and lower noise.

Nach bevorzugten Ausführungsformen der Erfindung kann der Zargenring im Wesentlichen zylindrisch oder konisch mit einer Erweiterung in Strömungsrichtung ausgebildet oder auch mit einem glocken- oder trichterförmigen Einlaufbereich versehen sein, der vorzugsweise gegenüber den Lüfteranströmkanten entgegen der Strömungsrichtung versetzt angeordnet ist.According to preferred embodiments of the invention, the Zargenring may be formed substantially cylindrical or conical with an extension in the flow direction or be provided with a bell-shaped or funnel-shaped inlet region, which is preferably arranged opposite to the Lüfteranströmkanten offset from the flow direction.

Nach einer weiteren bevorzugten Ausführungsform ist an dem Zargenring im Bereich der Anströmkante des Mantelringes ein Umlenkelement angeordnet, welches eine entgegen der Hauptströmung durch den Axiallüfter gerichtete Spaltströmung erzeugt. Bevorzugt ist das ringförmige Umlenkelement durch eine sich in Strömungsrichtung der Hauptströmung erstreckende Ringfläche verlängert, welche mit der äußeren Mantelfläche des Mantelringes einen Ringspalt bildet. Damit wird die Ausbildung einer wirksamen Spaltströmung unterstützt, welche die Hauptströmung im Blattspitzenbereich, d. h. innerhalb des Mantels stabilisiert. Darüber hinaus wird bei einem sich in stromabwärtiger Richtung erweiternden Mantelring und einer sich parallel erweiternden Ringfläche eine radiale Abströmung der Austrittsströmung begünstigt. Dies ist bei axial beschränktem Bauraum - infolge eines stromabwärts vom Lüfter angeordneten Motorblockes des Kraftfahrzeuges - von besonderem Vorteil.According to a further preferred embodiment, a deflecting element is arranged on the Zargenring in the region of the leading edge of the shroud, which generates a directed against the main flow through the axial fan gap flow. Preferably, the annular deflecting element is extended by an annular surface extending in the direction of flow of the main flow which forms an annular gap with the outer lateral surface of the lateral ring. Thus, the formation of an effective gap flow is supported, which stabilizes the main flow in the blade tip area, ie within the shell. In addition, a radially outflow of the outlet flow is favored in a sheath ring which widens in the downstream direction and a ring surface which widens in parallel. This is in an axially limited space - due to a downstream of the fan arranged engine block of the motor vehicle - of particular advantage.

Zur weiteren Unterstützung einer radialen Abströmung können an der Ringfläche Strömungsleitelemente, vorzugsweise in Form eines radialen Nachleitapparates vorgesehen sein. Die Erfindung mit den vorgenannten Ausführungsformen sieht infolge der Zurücksetzung des Mantels gegenüber den Schaufelvorderkanten also nur eine partielle Ummantelung der Lüfterschaufeln in Bezug auf die Schaufeltiefe vor, wobei in dem nicht ummantelten Bereich, dem Bereich der Zurücksetzung, der feststehende Zargenring angeordnet ist. Dadurch werden einerseits axialer Bauraum - im Hinblick auf einen Mantellüfter mit Einlaufdüse gemäß dem Stand der Technik und andererseits eine Stabilisierung der Hauptströmung als wesentliche Vorteile erreicht.To further support a radial outflow can be provided on the annular surface Strömungsleitelemente, preferably in the form of a radial Nachleitapparates. The invention with the aforementioned embodiments thus provides only a partial sheathing of the fan blades with respect to the blade depth due to the resetting of the shell relative to the blade leading edges, wherein in the non-jacketed region, the region of the reset, the fixed Zargenring is arranged. As a result, on the one hand axial space - achieved in terms of a shell fan with inlet nozzle according to the prior art and on the other hand, a stabilization of the main flow as significant advantages.

Die Aufgabe der Erfindung wird auch durch einen Axiallüfter mit den Merkmalen des nebengeordneten Patentanspruches 13 gelöst. Der erfindungsgemäße Axiallüfter weist einen vorstehenden, in eine Einlaufdüse hineinragenden Mantelring auf, wodurch die aus dem Stand der Technik bekannte Spaltströmung mit einer 180-Grad-Umlenkung zur Strömungsstabilisierung erreicht wird. Zur Vermeidung einer Fehlanströmung weist der erfindungsgemäße Axiallüfter eine freistehende Vorder- und Blattspitzenkante auf, d. h. zwischen dem anströmseitigen Blattspitzenbereich und der Innenfläche des Mantelrings ist ein Spalt in Form eines Zwickels belassen. Die Lüfterschaufeln können somit im vorderen und äußersten Bereich besser angeströmt werden, d. h. mit geringeren Verlusten, welche sich aus einer Fehlanströmung durch die Spalt- oder Düsenströmung ergeben. Die Fehlanströmung ist verursacht durch eine gegenüber der Hauptströmung höhere Geschwindigkeit der Spalt- oder Düsenströmung, die darüber hinaus eine Umfangskomponente aufweist. Somit wird ein beim Stand der Technik vorhandener Nachteil durch eine freie, vordere Blattspitzenkante beseitigt. Dennoch wird die stabilisierende Wirkung der Düsenströmung aufrechterhalten.The object of the invention is also achieved by an axial fan with the features of the independent claim 13. The axial fan according to the invention has a projecting, projecting into an inlet nozzle shroud, whereby the gap flow known from the prior art with a 180-degree deflection for flow stabilization is achieved. To avoid a false flow, the axial fan according to the invention has a freestanding front and blade tip edge, ie, a gap in the form of a gusset is left between the upstream blade tip region and the inner surface of the jacket ring. The fan blades can thus be better flown in the front and outermost region, ie with lower losses, which result from a Fehlanströmung by the gap or nozzle flow. The Fehlanströmung is caused by a relation to the main flow higher speed of the slit or nozzle flow, which also has a peripheral component. Thus, a disadvantage of the prior art is eliminated by a free, leading blade tip edge. Nevertheless, the stabilizing effect of the nozzle flow is maintained.

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im Folgenden näher erläutert. Es zeigen

Fig. 1
ein erstes Ausführungsbeispiel der Erfindung für einen Axiallüfter mit zurückgesetztem Mantelring und feststehendem Zargenring,
Fig. 2
eine Abwandlung des Ausführungsbeispieles gemäß Fig. 1,
Fig. 3
ein weiteres Ausführungsbeispiel der Erfindung mit einem Mantellüfter und Einlaufdüse,
Fig. 4
eine Abwandlung des Ausführungsbeispieles gemäß Fig. 1,
Fig. 5
eine weitere Abwandlung des Ausführungsbeispieles gemäß Fig. 1,
Fig. 6
ein weiteres Ausführungsbeispiel der Erfindung mit einem am Leitring angeordneten ringförmigen Umlenkelement,
Fig. 7
eine Weiterbildung des Ausführungsbeispieles gemäß Fig. 6,
Fig. 8
eine Weiterbildung des Ausführungsbeispieles gemäß Fig. 7,
Fig. 9
eine Darstellung der Lüfterströmung für einen Axiallüfter nach dem Stand der Technik,
Fig. 10
eine Darstellung der Haupt- und Spaltströmung bei einem Mantellüfter mit Einlaufdüse nach dem Stand der Technik und
Fig. 11
eine Darstellung der Haupt- und Spaltströmung bei einem erfindungsgemäßem Axiallüfter.
Embodiments of the invention are illustrated in the drawings and will be explained in more detail below. Show it
Fig. 1
A first embodiment of the invention for an axial fan with reset shroud and fixed frame ring,
Fig. 2
a modification of the embodiment according to Fig. 1 .
Fig. 3
a further embodiment of the invention with a jacket fan and inlet nozzle,
Fig. 4
a modification of the embodiment according to Fig. 1 .
Fig. 5
a further modification of the embodiment according to Fig. 1 .
Fig. 6
a further embodiment of the invention with an annular deflecting element arranged on the guide ring,
Fig. 7
a development of the embodiment according to Fig. 6 .
Fig. 8
a development of the embodiment according to Fig. 7 .
Fig. 9
a representation of the fan flow for an axial fan according to the prior art,
Fig. 10
a representation of the main and gap flow in a shell fan with inlet nozzle according to the prior art and
Fig. 11
a representation of the main and gap flow in an inventive axial fan.

Fig. 1 zeigt einen Axiallüfter 1, welcher über eine Kupplung 2, vorzugsweise eine Flüssigkeitsreibungskupplung gegenüber einer nicht dargestellten Brennkraftmaschine eines Kraftfahrzeuges gelagert und von dieser angetrieben wird. Der Axiallüfter 1 ist Teil einer Kühlvorrichtung, welche nicht dargestellte Wärmeübertrager, z. B. einen Kühlmittelkühler, einen Ladeluftkühler und einen Kältemittelkondensator aufweisen kann. Der Axiallüfter 1 wird in Richtung eines Pfeiles L von Luft angeströmt, ist vorzugsweise in Strömungsrichtung hinter den nicht dargestellten Wärmeübertragem angeordnet und saugt Umgebungsluft durch die Wärmeübertrager. Der Axiallüfter 1 ist dabei über eine nicht dargestellte Lüfterzarge zur Führung der Kühlluft mit den vorgeschalteten Wärmeübertragern verbunden. Der Axiallüfter 1 weist eine mit der Kupplung 2 verbundene Nabe 3 sowie Axialschaufeln 4 mit einer Vorderkante 4a und einer Hinterkante 4b auf. Die Rotationsachse des Lüfters ist mit a bezeichnet. Die Axialschaufeln 4 weisen eine Schaufeltiefe t auf, welche sich von der Vorderkanten 4a bis zur Hinterkante 4b erstreckt. Die Schaufeln 4 weisen Schaufelspitzen (Blattspitzen) 4c auf, an welchen ein Mantelring 5 mit einer Anströmkante 5a und einer Abströmkante 5b befestigt ist. Die Anströmkante 5a ist gegenüber den Vorderkanten 4a der Lüfterschaufeln 4 um einen Betrag X1 in Strömungsrichtung L versetzt, während die Abströmkante 5b gegenüber der Hinterkante 4b entgegen der Strömungsrichtung um einen Betrag X2 versetzt ist. Die axiale Erstreckung I des Mantelringes 5 ist also kleiner als die Schaufeltiefe t. Der Bereich der Blattspitzen 4c, welcher sich in Strömungsrichtung vor der Anströmkante 5a befindet, d. h. der Bereich X1 der Zurücksetzung der Anströmkante 5a weist einen reduzierten Durchmesser D1 auf. Dadurch wird ein Eckbereich der Schaufelspitzen 4c ausgespart, in welchem ein ortfest angeordneter Leitring 6 angeordnet ist, wobei der Leitring 6 einen mittleren Durchmesser D2 aufweist, der größer als der Durchmesser D1, jedoch kleiner als der Durchmesser der Anströmkante 5a ist. Der Leitring 6 ist im Wesentlichen zylindrisch ausgebildet, überlappt sich in axialer Richtung mit den Axialschaufeln 4 und steht etwas gegenüber den Vorderkanten 4a vor, d. h,. entgegen der Strömungsrichtung L. Der Leitring 6 ist vorzugsweise motorfest angeordnet, d. h. ebenso wie der Axiallüfter 1, d. h. zwischen dem rotierenden Lüfter 1 und dem feststehenden Leitring 6 treten keine Relativbewegungen auf, sodass ein minimaler Spalt realisiert werden kann. Fig. 1 shows an axial fan 1, which is mounted on a clutch 2, preferably a fluid friction clutch against an internal combustion engine, not shown, of a motor vehicle and driven by this. The axial fan 1 is part of a cooling device, which heat exchanger, not shown, for. B. may have a coolant radiator, a charge air cooler and a refrigerant condenser. The axial fan 1 is flown in the direction of an arrow L of air, is preferably arranged in the flow direction behind the heat transfer, not shown, and sucks ambient air through the heat exchanger. The axial fan 1 is connected via a fan shroud, not shown, for guiding the cooling air with the upstream heat exchangers. The axial fan 1 has a hub 3 connected to the clutch 2 and axial blades 4 with a front edge 4 a and a trailing edge 4 b. The axis of rotation of the fan is designated by a. The axial blades 4 have a blade depth t which extends from the leading edge 4a to the trailing edge 4b. The blades 4 have blade tips (blade tips) 4c, to which a shroud 5 with a leading edge 5a and a trailing edge 5b is attached. The leading edge 5a is offset from the leading edges 4a of the fan blades 4 by an amount X1 in the flow direction L, while the trailing edge 5b is offset from the trailing edge 4b counter to the flow direction by an amount X2. The axial extent I of the shroud 5 is thus smaller than the blade depth t. The area of the blade tips 4c, which is in the flow direction in front of the leading edge 5a, ie the area X1 of the resetting of the leading edge 5a has a reduced diameter D1. As a result, a corner region of the blade tips 4c is recessed, in which a stationary arranged guide ring 6 is arranged, wherein the guide ring 6 has a mean diameter D2, which is greater than the diameter D1, but smaller than the diameter of the leading edge 5a. The guide ring 6 is formed substantially cylindrical, overlaps in the axial direction with the axial blades 4 and is slightly opposite to the leading edges 4a, d. H,. opposite to the flow direction L. The guide ring 6 is preferably arranged fixed motor, ie, as well as the axial fan 1, ie between the rotating fan 1 and the fixed guide ring 6 occur no relative movements, so that a minimal gap can be realized.

Fig. 2 zeigt einen Lüfter 7, der eine Abwandlung des Lüfters 1 gemäß Fig. 1 darstellt, wobei für gleiche Teile gleiche Bezugszahlen wie zuvor verwendet werden. Der Lüfter 7 entspricht im Wesentlichen dem Lüfter 1, weist also eine ähnliche Axialbeschaufelung 4 und einen ähnlichen Mantelring 5 auf. Im Bereich der Zurücksetzung der Anströmkante 5a ist ein ortsfester Leitring 8 angeordnet, welcher konisch bzw. diffusorartig ausgebildet ist, d. h. sich in Strömungsrichtung L erweitert. Der ausgesparte Blattspitzenbereich 4c ist an die konische Form des Leitringes 8 angepasst. Durch den diffusorartig ausgebildeten Leitring 8 wird der im Wesentlichen halbaxial ausgerichteten Hauptströmung des Lüfters 7 Rechnung getragen, sodass der Strömung bereits eine radiale Komponente mitgegeben wird. Fig. 2 shows a fan 7, the a modification of the fan 1 according to Fig. 1 represents, wherein the same reference numerals are used for the same parts as before. The fan 7 substantially corresponds to the fan 1, thus has a similar Axialbeschaufelung 4 and a similar shroud 5 on. In the region of the resetting of the leading edge 5a, a stationary guide ring 8 is arranged, which is conical or diffuser-like in design, ie widens in the flow direction L. The recessed blade tip region 4 c is adapted to the conical shape of the guide ring 8. Due to the diffuser-shaped guide ring 8, the substantially semiaxially oriented main flow of the fan 7 is taken into account, so that the flow is already given a radial component.

Fig. 3 zeigt ein weiteres Ausführungsbeispiel der Erfindung, bei welchem ein Axiallüfter 9 einen Mantel 10 mit einem vorstehenden, zylindrischen Bereich 10a aufweiset, welcher in eine im Querschnitt U- oder C-förmig ausgebildete Einlaufdüse 11 hineinragt. Ein derartiger Mantellüfter mit Einlaufdüse ist aus dem eingangs genannten Stand der Technik bekannt und erzeugt eine Spalt- oder Düsenströmung, welche sich im Blattspitzenbereich der Hauptströmung überlagert und für eine Stabilisierung der Hauptströmung sorgt. Im Unterschied zum Stand der Technik reichen die Vorderkanten 4a der Lüfterschaufeln 4 nicht bis an die Innenfläche des Mantels 10, wodurch ein Spalt s in Form eines Zwickels gebildet wird. Die Lüfterschaufel 4 weist im anströmseitigen Bereich eine freie Schaufelspitzenkante 12 auf, welche den Zwickel s begrenzt und von der durch die Einlaufdüse 11 gebildeten Düsenströmung frei anströmbar ist. Durch die freie Blattspitzenkante 12 und die radial nach innen zurückgenommene Schaufelvorderkante 4a wird eine Fehlanströmung durch die mit einer Umfangskomponente behaftete Spaltströmung vermieden. Fig. 3 shows a further embodiment of the invention, in which an axial fan 9 has a jacket 10 with a protruding, cylindrical portion 10a, which projects into a U-shaped or C-shaped inlet nozzle 11 in cross-section. Such a jacket fan with inlet nozzle is known from the aforementioned prior art and generates a gap or nozzle flow, which is superimposed in the blade tip region of the main flow and ensures stabilization of the main flow. In contrast to the prior art, the leading edges 4a of the fan blades 4 do not extend to the inner surface of the shell 10, whereby a gap s in the form of a gusset is formed. The fan blade 4 has, in the upstream region, a free blade tip edge 12 which delimits the gusset s and can be flowed freely by the nozzle flow formed by the inlet nozzle 11. Due to the free blade tip edge 12 and the radially inwardly retracted blade leading edge 4a a Fehlanströmung is avoided by the affected with a peripheral component gap flow.

Die Ausführungsbeispiele gemäß Figuren 1 und 2 einerseits sowie das Ausführungsbeispiel gemäß Fig. 3 andererseits sind durch die gemeinsame erfinderische Idee miteinander verbunden, dass die Vorderkanten der Lüfterschaufeln im Schaufelspitzenbereich frei stehen, d. h. nicht ummantelt sind. Damit wird in beiden Fällen eine Fehlanströmung vermieden.The embodiments according to Figures 1 and 2 on the one hand and the embodiment according to Fig. 3 On the other hand, are connected by the common inventive idea that the leading edges of the fan blades in the blade tip area are free, that is not sheathed. This avoids a false flow in both cases.

Fig. 4 zeigt ein weiteres Ausführungsbeispiel der Erfindung für einen Lüfter 13, welcher im Wesentlichen den Lüftern 1 und 7 der Ausführungsbeispiele gemäß Fig. 1 und Fig. 2 entspricht. Unterschiedlich ist die Ausbildung des Leitringes 14, welcher sich entgegen der Strömungsrichtung L konisch oder glockenförmig erweitert und somit einen Einlauftrichter für die einströmende Luft bildet. Der zurückgenommene Blattspitzenbereich 4c ist an diese Form des Leitringes 14 entsprechend angepasst. Fig. 4 shows a further embodiment of the invention for a fan 13, which substantially the fans 1 and 7 of the embodiments according to Fig. 1 and Fig. 2 equivalent. Different is the formation of the guide ring 14, which widens conically or bell-shaped counter to the flow direction L and thus forms an inlet funnel for the incoming air. The withdrawn blade tip region 4c is adapted to this shape of the guide ring 14 accordingly.

Fig. 5 zeigt eine weitere Abwandlung des vorherigen Ausführungsbeispieles, d. h. für einen Lüfter 13, dessen Mantelring 5 ein feststehender Leitring 15 vorgeschaltet ist, welcher an seinem Lufteintrittsbereich einen sich radial nach innen erstreckenden Blendenring 15a aufweist. Der Blendenring 15a deckt den Radialspalt zwischen Leitring 15 und dem Blattspitzenbereich 4c der Axialschaufeln 4 ab. Fig. 5 shows a further modification of the previous embodiment, ie for a fan 13, the shroud 5, a fixed guide ring 15 is connected upstream, which has at its air inlet region a radially inwardly extending aperture ring 15a. The aperture ring 15a covers the radial gap between the guide ring 15 and the blade tip portion 4c of the axial blades 4.

Fig. 6 zeigt ein weiteres Ausführungsbeispiel der Erfindung mit einem Axiallüfter 16, welcher Axialschaufeln 4 und einen Mantelring 5 aufweist. Ein Leitring 17, leicht konisch und diffusorartig ausgebildet, ist dem Mantelring 5 vorgeschaltet und weist eine Anströmkante 17a sowie eine Abströmkante 17b auf. Zwischen der Abströmkante 17b des Leitringes 17 und der Anströmkante 5a des Mantelringes 5 ist ein Radialspalt 18 belassen, dem ein ringförmiges Umlenkelement 19, befestigt an dem Leitring 17, zugeordnet ist. Durch diese Anordnung wird eine Einlaufdüse gebildet, welche eine Spalt- oder Düsenströmung ermöglicht, was im Zusammenhang mit dem nächsten Ausführungsbeispiel näher erläutert wird. Fig. 6 shows a further embodiment of the invention with an axial fan 16, which axial blades 4 and a shroud 5 has. A guide ring 17, slightly conical and diffuser-like design, is connected upstream of the jacket ring 5 and has a leading edge 17a and an outflow edge 17b. Between the trailing edge 17b of the guide ring 17 and the leading edge 5a of the shroud 5, a radial gap 18 is left, to which an annular deflecting element 19 attached to the guide ring 17 is assigned. By this arrangement, an inlet nozzle is formed, which allows a gap or nozzle flow, which will be explained in more detail in connection with the next embodiment.

Fig. 7 zeigt ein weiteres Ausführungsbeispiel der Erfindung, welches eine Weiterbildung der Ausführung gemäß Fig. 6 darstellt. Ein Axiallüfter 20 weist eine Axialbeschaufelung 4 mit einem Mantelring 5 und einem vorgeschalteten Leitring 21 auf, an welchem zusätzlich zu dem ringförmigen Umlenkelement 19 eine sich in axialer und radialer Richtung, parallel zum Mantelring 5 erstreckende Ringfläche 22 anschließt. Die Hauptströmung des Lüfters 20 ist durch drei Strömungspfeile P1, P2, P3 dargestellt, während durch einen vierten Pfeil P4 eine Spalt- oder Düsenströmung angedeutet ist. Zwischen der Außenfläche des Mantelringes 5 und der Ringfläche 22 befindet sich ein Ringspalt 23, durch welchen Luft von der Druckseite des Lüfters entgegen der Hauptströmungsrichtung strömt, im Umlenkelement 19 umgelenkt wird und durch den Radialspalt 18 in den Lüfter 20, d. h. dessen Axialbeschaufelung 4 eintritt. Diese Spalt- oder Düsenströmung, bezeichnet mit dem Pfeil P4, wirkt sich stabilisierend auf die Hauptströmung im Lüfter aus. Die Geometrie des Leitringes 21 und des Mantelringes 5 ist derart beschaffen, dass sich eine Diffusorwirkung ergibt, wodurch die Hauptströmung P1, P2, P3 in eine radiale Richtung umgelenkt wird. Dies ist bei dem in axialer Richtung beengten Bauraum im Kraftfahrzeug, insbesondere durch den stromabwärts angeordneten, nicht dargestellten Motorblock von großem Vorteil. Fig. 7 shows a further embodiment of the invention, which is a development of the embodiment according to Fig. 6 represents. An axial fan 20 has a Axialbeschaufelung 4 with a shroud 5 and an upstream guide ring 21, on which in addition to the annular deflecting element 19 in the axial and radial direction, parallel to the shroud 5 extending annular surface 22 connects. The main flow of the fan 20 is represented by three flow arrows P1, P2, P3, while a gap or nozzle flow is indicated by a fourth arrow P4. Between the outer surface of the jacket ring 5 and the annular surface 22 is an annular gap 23 through which air flows from the pressure side of the fan counter to the main flow direction, is deflected in the deflecting element 19 and through the radial gap 18 in the fan 20, ie the Axialbeschaufelung 4 occurs. This gap or nozzle flow, indicated by the arrow P4, has a stabilizing effect on the main flow in the fan. The geometry of the guide ring 21 and the shroud 5 is such that a diffuser effect results, whereby the main flow P1, P2, P3 is deflected in a radial direction. This is at the cramped space in the motor vehicle in the axial direction, in particular by the downstream arranged, not shown engine block of great advantage.

Fig. 8 zeigt eine Weiterbildung des Ausführungsbeispieles gemäß Fig. 7, wobei die Ringfläche 22 weiter in axialer und radialer Richtung verlängert ist und Strömungsleitelemente 24 trägt, welche eine radiale Ausrichtung der Lüfterabströmung bewirken. Die Strömungsleitelemente 24 können nach Art eines radialen Nachleitapparates ausgebildet sein, wie er in der älteren Anmeldung der Anmelderin mit dem amtlichen Aktenzeichen xy... (Zeichen der Anmelderin: 06-B-060) beschrieben ist. Durch dieses Ausführungsbeispiel lässt sich bei kompakter, axial beschränkter Bauweise eine relativ verlustfreie, radial gerichtete Abströmung aus dem Lüfter erreichen. Fig. 8 shows a development of the embodiment according to Fig. 7 , wherein the annular surface 22 is further extended in the axial and radial directions and carries flow guide elements 24, which cause a radial orientation of the fan outflow. The flow guide elements 24 may be formed in the manner of a radial Nachleitapparates, as described in the earlier application of the Applicant with the official file number xy ... (Sign of the Applicant: 06-B-060). With this embodiment, a relatively lossless, radially directed outflow from the fan can be achieved in a compact, axially limited construction.

Fig. 9 zeigt eine Darstellung der Lüfterströmung für einen Axiallüfter nach dem Stand der Technik. Die Hauptströmung ist halbaxial gerichtet, wie durch parallel verlaufende Pfeile P angedeutet ist. Im anströmseitigen Blattspitzenbereich bildet sich ein Wirbel W aus, welcher die Hauptströmung stört und den Wirkungsgrad des Lüfters verschlechtert. Fig. 9 shows a representation of the fan flow for an axial fan according to the prior art. The main flow is directed semi-axially, as indicated by parallel arrows P. In the upstream blade tip region forms a vortex W, which disturbs the main flow and deteriorates the efficiency of the fan.

Fig. 10 zeigt einen durch den Stand der Technik bekannten Mantellüfter mit so genannter Einlaufdüse, durch welche eine Düsenströmung, dargestellt durch die beiden äußersten Pfeile D, erzeugt wird. Im Vergleich der Figuren 9 und 10 ist erkennbar, dass der Wirbel W durch die Düsenströmung D eliminiert wird. Dadurch wird eine stabile Strömung auch im Schaufelspitzenbereich erreicht. Fig. 10 shows a known from the prior art shell fan with so-called inlet nozzle, through which a nozzle flow, represented by the two outermost arrows D, is generated. In comparison of the FIGS. 9 and 10 it can be seen that the vortex W is eliminated by the nozzle flow D. As a result, a stable flow is achieved even in the blade tip area.

Fig. 11 zeigt ein weiteres Strömungsbild für den erfindungsgemäßen Axiallüfter 1 nach dem Ausführungsbeispiel gemäß Fig. 1. Die Strömung durch die Axialbeschaufelung 4 verläuft entsprechend den Pfeilen in halbaxialer Richtung. Zwischen dem Mantelring 5 und dem feststehenden Leitring 6 bildet sich eine Düsenströmung aus, welche durch den äußersten Pfeil F angedeutet ist. Durch diese erfindungsgemäße Anordnung, verbunden mit der Düsenströmung F, wird eine Stabilisierung der Hauptströmung auch im Schaufelspitzenbereich erreicht. Fig. 11 shows a further flow pattern for the axial fan 1 according to the invention according to the embodiment according to Fig. 1 , The flow through the Axialbeschaufelung 4 runs according to the arrows in the half-axial direction. Between the casing ring 5 and the fixed guide ring 6, a nozzle flow is formed, which is indicated by the outermost arrow F. By means of this arrangement according to the invention, connected to the nozzle flow F, stabilization of the main flow is achieved even in the blade tip area.

Claims (14)

  1. An axial fan for conveying cooling air for a cooling device of a motor vehicle, wherein the axial fan is adapted to be connected to an upstream heat exchanger via a fan shroud for conveying the cooling air, wherein the axial fan comprises axial vanes (4), each having a leading edge (4a) and a trailing edge (4b) as well as a vane tip (4c), and a shroud ring (5) connected to the vane tips (4c) and having an inflow edge (5a) and an outflow edge (5b), characterised in that the inflow edge (5a) of the shroud ring (5) is recessed relative to the leading edges (4a) of the axial vanes (4) in the flow direction (L) such that the shroud ring only extends over the downstream portion of the fan vane depth in axial direction, and a stationary guide ring (6, 8, 14, 15, 17, 21) is arranged upstream of the shroud ring (5) relative to the flow direction in the recessed section (X1).
  2. The axial fan according to claim 1, characterised in that the diameter D1 of the vane tips (4c) is reduced in comparison to the diameter of the shroud ring (5) in the recessed section (X1).
  3. The axial fan according to claim 2, characterised in that the diameter D2 of the guide ring (6, 8, 14, 15, 17, 21) is smaller than the diameter of the shroud ring (5), particularly smaller than the diameter of the inflow edge (5a) of the shroud ring (5).
  4. The axial fan according to any one of claims 1 to 3, characterised in that the guide ring (6) is of essentially cylindrical shape.
  5. The axial fan according to any one of claims 1 to 3, characterised in that the guide ring (8, 17, 21) is of essentially conical shape and widens in the flow direction.
  6. The axial fan according to any one of the preceding claims, characterised in that the guide ring (14) widens conically or in the form of a bell in the air inlet section.
  7. The axial fan according to any one of the preceding claims, characterised in that the guide ring (6, 8, 14, 15, 17, 21) has an inflow edge which is arranged upstream of the leading edges (4a) of the axial vanes (4) relative to the flow direction.
  8. The axial fan according to claim 7, characterised in that an annular deflecting element, particularly in the form of a cover ring (15a), is arranged on the inflow edge of the guide ring (15).
  9. The axial fan according to any one of the preceding claims, characterised in that the outflow edge (5b) of the shroud ring (5) is offset to the front from the trailing edges (4b) of the axial vanes (4) in the flow direction.
  10. The axial fan according to any one of the preceding claims, characterised in that an annular diverting element (19) is arranged on the guide ring (17, 21), wherein the outside diameter of the annular diverting element is larger than the diameter of the inflow edge (5a) of the shroud ring (5).
  11. The axial fan according to claim 10, characterised in that the diverting element (19) is extended by an annular surface (22) that is essentially parallel to the outer surface of the shroud ring (5), leaving a radial gap (23).
  12. The axial fan according to claim 11, characterised in that flow guide elements (24), particularly in the form of a radial discharge nozzle, are arranged on the downstream end of the annular surface (22).
  13. An axial fan for conveying cooling air for a cooling device of a motor vehicle, wherein the axial fan (9) comprises axial vanes (4), each having a leading edge (4a) and a trailing edge (4b) as well as a vane tip (4c), and a shroud ring (10) connected to the vane tips (4c) and having a cylindrical section (10a) which extends beyond the leading edges (4a) of the axial vanes (4) and projects into an inlet nozzle (11), characterised in that a gap (s) remains between the shroud ring (10) and the leading edges (4a) of the axial vanes (4).
  14. The axial fan according to claim 13, characterised in that the gap (s) has the shape of an acute angle in an axial section, wherein one leg is formed by a surface line of the shroud (10) and the other leg is formed by a free edge (12) of the leading vane tip (4c).
EP07818176.5A 2006-10-04 2007-09-17 Axial fan for conveying cooling air for a cooling device of a motor vehicle Not-in-force EP2076661B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006047236.5A DE102006047236B4 (en) 2006-10-04 2006-10-04 Axial fan arranged to promote cooling air of a cooling device of a motor vehicle
PCT/EP2007/008055 WO2008040443A1 (en) 2006-10-04 2007-09-17 Axial fan for conveying cooling air for a cooling device of a motor vehicle

Publications (2)

Publication Number Publication Date
EP2076661A1 EP2076661A1 (en) 2009-07-08
EP2076661B1 true EP2076661B1 (en) 2016-11-09

Family

ID=38983488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07818176.5A Not-in-force EP2076661B1 (en) 2006-10-04 2007-09-17 Axial fan for conveying cooling air for a cooling device of a motor vehicle

Country Status (4)

Country Link
US (1) US8277180B2 (en)
EP (1) EP2076661B1 (en)
DE (1) DE102006047236B4 (en)
WO (1) WO2008040443A1 (en)

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Also Published As

Publication number Publication date
DE102006047236B4 (en) 2017-06-29
US8277180B2 (en) 2012-10-02
DE102006047236A1 (en) 2008-04-10
US20100014967A1 (en) 2010-01-21
WO2008040443A1 (en) 2008-04-10
EP2076661A1 (en) 2009-07-08

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