EP2047107B1 - Fan blade - Google Patents

Fan blade Download PDF

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Publication number
EP2047107B1
EP2047107B1 EP07788132A EP07788132A EP2047107B1 EP 2047107 B1 EP2047107 B1 EP 2047107B1 EP 07788132 A EP07788132 A EP 07788132A EP 07788132 A EP07788132 A EP 07788132A EP 2047107 B1 EP2047107 B1 EP 2047107B1
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EP
European Patent Office
Prior art keywords
insert
blade
blade body
fan
fan blade
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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.)
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Application number
EP07788132A
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German (de)
French (fr)
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EP2047107A1 (en
Inventor
Gunter Streng
Rainer Müller
Rolf Bickel
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Ebm Papst Mulfingen GmbH and Co KG
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Ebm Papst Mulfingen GmbH and Co KG
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Publication of EP2047107A1 publication Critical patent/EP2047107A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • 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
    • F04D29/38—Blades
    • F04D29/388—Blades characterised by construction

Definitions

  • the present invention relates to a fan blade according to claim 1.
  • Such a fan blade is from the EP 1 571 346 A2 known.
  • the insert consists of two plate-shaped items that are mutually perpendicular. Due to this design of the insert, the blade body must have a relatively large thickness in order to completely enclose the insert. This results in high material costs and, in addition, the centrifugal force of the rotating paddle wheel is thereby increased, which leads to an increased force load. In addition, the manufacture and pre-assembly of the two plate-shaped items is complex.
  • the present invention is based on the object to provide a fan blade, on the one hand enables a cost-effective production and assembly and practically in the shaft longitudinal direction during rotation substantially no material elongations subject.
  • the insert part is designed as a flat metal part which is adapted substantially to the shape of the blade molding and which has an uncoated planar fastening section in the fan blade root area.
  • the blade molding is inventively designed as a plastic injection molded part.
  • the attachment section does not protrude from the outer fan blade contour, but the attachment section is integrated in the blade contour.
  • the flat planar design of the attachment portion allows easy mounting of the fan blade according to the invention with simultaneous alignment. Due to the inventive design, the fan impeller according to the invention in its interior with a large proportion of the insert itself, which can be made relatively thin, z. B. It can be made of a 2 mm thick sheet steel or be made of aluminum sheet.
  • the plastic extrusion is such that a cover of the insert is achieved, however, the plastic volume can be kept low.
  • the fastening section is preferably arranged approximately centrally in the fan blade foot region and extends directly from the edge of the foot region into the blade molding.
  • the invention further relates to a fan wheel using the fan blade according to the invention.
  • a fan blade according to the invention consists of a blade body 1, which is formed from an insert part 3 and an outer blade molding part 2 which partially encloses it.
  • the insert 3 is embedded in the blade molding 2 and completely enclosed except for its uncoated mounting portion 4.
  • the blade molding 2 is preferably as Plastic injection molded part and the insert 3 is encapsulated during the injection process of the plastic injection molded part simultaneously.
  • the plastic material used is in particular a polyamide plastic or polypropylene or polybutylene terephthalate (PBT). According to the invention, it may be expedient if the insert part 3 is provided with a primer layer as adhesion promoter before the extrusion coating. As it turned out Fig.
  • the mounting portion 4 remains uncoated, so that here the metal sheet consisting of insert 3 can be attached under direct contact with a mounting flange of a hub of a fan wheel.
  • the attachment portion 4 has a bore 5, through which the required fastening screw 26 can be inserted.
  • Ausrichtaus traditions 6 are formed in the mounting portion 4, fit into the adapted projections 24 on the mounting flange 22 of the fan hub 21, see FIGS. 5 and 6 ,
  • the mounting portion 4 is flat and flat, so that the system is possible over the entire surface of the corresponding mounting flange.
  • the attachment portion 4 is arranged approximately centrally in the fan blade foot region 7 and extends directly from the edge 8 of the foot region 7 in the blade molding part 2 inside.
  • the insert 3 thus does not project beyond the edge 8 with its attachment section 4, but is integrated within the blade molding part 2.
  • the insert 3 is formed starting from the mounting portion 4 as a curved molding.
  • a curvature is present both in the direction of the longitudinal axis YY and in the direction of the transverse axis XX.
  • a corresponding curvature also has the fan blade according to the invention. Since the fastening portion 4 is flat, it is surrounded by an oppositely curved transition region 10.
  • the insert part 3 has two stiffening ribs 12 in the exemplary embodiment shown. These stiffening ribs 12 extend in the manner of a spoke from the circumference of the fastening section 4 in the direction of the longitudinal extent or the longitudinal axis YY of the blade body 1 or of the insert part. These reinforcing ribs 12 are embossed into the material of the insert part 3.
  • the insert part 3 consists of a steel sheet or an aluminum sheet with a thickness of for example 2 mm.
  • the insert part 3 has a plurality of apertures 13 formed in its surface, which may be in particular circular or elliptical in shape. Through these openings 13, the plastic material can pass during encapsulation with the plastic material of the blade molding part 2, so that a through-connection of the plastic takes place on both sides of the insertion part 3.
  • the distribution of the apertures 13 is such that the plurality of apertures 13 between the end of the stiffening ribs 12 and the foot portion 7 of the blade forming part 2 opposite end and in the direction of rotation of the fan blade or the Ventilartorschaufel in the region between the stiffening ribs 12 and the respective rear Longitudinal edge 11 of the fan blade are arranged.
  • the apertures 13 are arranged so and there that they are present in the areas and ensure a through connection of the plastic material, where the largest plastic overlap is present.
  • apertures 13 are formed in the immediate vicinity of the transition section 10.
  • the adaptation of the shape of the insert 3 and the shape of the blade body 1 is such that the boundary edges of the blade body 1 and the insert 3 in the foot region 7 coincide and the two opposite boundary edges in the longitudinal direction YY of the insert 3 and the corresponding boundary edges of the blade body 1 to each other in such a way that between these edges, starting from the foot region 7, an expanding gap region is present.
  • the gap region 14 in the region of the rear boundary edges 11, 11a in the direction of rotation is much larger than the gap region 15 of the front longitudinal edges 11b, 11c in the direction of rotation, ie, only a slight overlap of the blade molding part 2 in the front region of the blade body in the direction of rotation the insert 3 available.
  • the insert 3 has a maximum length 1, which is about 60% to 85%, preferably about 75% to 80% of the maximum length L of the blade body 1. Furthermore, the insert 3 has a maximum width b, which is 35% to 60%, preferably 38% to 53% of the maximum width B of the blade body 1.
  • An inventive fan wheel 20 consists of a hollow cylindrical hub 21, on the periphery of mounting flanges 22 are formed. At these mounting flanges 22, the fan blades according to the invention are attached.
  • the hub 21 is made of die-cast aluminum or steel and can form the rotor of a DC motor.
  • To the mounting flanges 22, the fan blades according to the invention are attached to the mounting portion 4.
  • the mounting flanges 22 may be cast on the rotor. Is the rotor, however, as in FIGS. 5 and 6 shown, made of steel, so the mounting flanges 22 are circumferentially welded to the hub 21.
  • the mounting flanges 22 may be conveniently prepared as stampings or stamped and bent parts.
  • the mounting flanges 22 may be formed as a sheet steel stamped and bent part, which consists of a central abutment portion 27, each with its longitudinal sides 28 bent stiffening webs 29.
  • the stiffening webs 29 have a substantially triangular shape, with the stiffening webs 29 tapering towards the free end of the abutment sections 27. This results in a cross-sectionally U-shaped design of the mounting flanges 22, in particular in the lower mounting area, where they are welded to the hub 21.
  • the invention is not limited to the illustrated and described embodiments, but also includes all the same in the context of the invention embodiments. Furthermore, the invention has hitherto not been limited to the feature combination defined in claim 1, but may also be defined by any other combination of specific features of all individually disclosed individual features. This means that in principle virtually every individual feature of claim 1 can be omitted or replaced by at least one individual feature disclosed elsewhere in the application. In this respect, the claim 1 is to be understood only as a first formulation attempt for an invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Power Steering Mechanism (AREA)

Abstract

The present invention relates to a fan blade for axial fans with a blade body comprising an inner inlaid part and an outer blade shaped part partially enclosing said inner inlaid part. The outer blade is made of a material of lower rigidity than the inlaid part. The inlaid part is constructed as a substantially flat metal part adapted to the shape of the blade body and in the fan blade base region has an unencapsulated smooth fixing section.

Description

Die vorliegende Erfindung betrifft eine Ventilatorschaufe gemäß Anspruch 1.The present invention relates to a fan blade according to claim 1.

Die Druckschrift US 4 636 142 A , die als nächstliegender Stand der Technik angesehen wird, offenbart die Merkmale des Oberbegriffs des Aupruchs 1.The publication US 4 636 142 A , which is considered to be the closest prior art, discloses the features of the preamble of Aupruchs 1.

Eine derartige Ventilatorschaufel ist aus der EP 1 571 346 A2 bekannt. Hierbei besteht das Einlegeteil aus zwei plattenförmigen Einzelteilen, die zueinander senkrecht angeordnet sind. Durch diese Ausbildung des Einlegeteils muss der Schaufelkörper eine relativ große Dicke aufweisen, um das Einlegeteil vollständig zu umschließen. Hierdurch entstehen hohe Materialkosten und zudem wird hierdurch die Fliehkraft des rotierenden Schaufelrades erhöht, was zu einer erhöhten Kräftebelastung führt. Zudem ist die Herstellung und Vormontage der zwei plattenförmigen Einzelteile aufwändig.Such a fan blade is from the EP 1 571 346 A2 known. Here, the insert consists of two plate-shaped items that are mutually perpendicular. Due to this design of the insert, the blade body must have a relatively large thickness in order to completely enclose the insert. This results in high material costs and, in addition, the centrifugal force of the rotating paddle wheel is thereby increased, which leads to an increased force load. In addition, the manufacture and pre-assembly of the two plate-shaped items is complex.

Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, eine Ventilatorschaufel zu schaffen, die einerseits eine kostengünstige Herstellung und Montage ermöglicht und praktisch in Schaftlängsrichtung bei Rotation im Wesentlichen keinen Materiallängungen unterliegt.The present invention is based on the object to provide a fan blade, on the one hand enables a cost-effective production and assembly and practically in the shaft longitudinal direction during rotation substantially no material elongations subject.

Erfindungsgemäß wird dies dadurch erreicht, dass das Einlegeteil als ein im Wesentlichen der Form des Schaufelformteils angepasstes flächiges Metallteil ausgebildet ist, das im Ventilatorschaufel-Fußbereich einen unbeschichteten ebenen Befestigungsabschnitt aufweist. Das Schaufelformteil ist erfindungsgemäß als Kunststoffspritzgussteil ausgebildet. Erfindungsgemäß steht der Befestigungsabschnitt nicht gegenüber der äußeren Ventilatorschaufelkontur vor, sondern der Befestigungsabschnitt ist in der Schaufelkontur integriert. Durch die ebene flächige Ausbildung des Befestigungsabschnittes wird eine leichte Montage der erfindungsgemäßen Ventilatorschaufel unter gleichzeitiger Ausrichtung ermöglicht. Durch die erfindungsgemäße Ausgestaltung besteht das erfindungsgemäße Ventilatorschaufelrad in seinem Inneren mit einem großen Anteil aus dem Einlegeteil selber, das relativ dünn ausgebildet werden kann, z. B. kann es aus einem 2 mm dicken Stahlblech bzw. aus Aluminiumblech hergestellt sein. Die Kunststoffumspritzung ist dabei derart, dass eine Abdeckung des Einlegeteils erreicht wird, jedoch das Kunststoffvolumen gering gehalten werden kann. Vorzugsweise ist der Befestigungsabschnitt etwa mittig im Ventilatorblatt-Fußbereich angeordnet und erstreckt sich unmittelbar vom Rand des Fußbereiches in das Schaufelformteil. Hierdurch ist eine sehr gleichmäßige Krafteinleitung in das Ventilatorschaufelrad möglich und die Antriebs- und Fliehkräfte werden unmittelbar von dem Einlegeteil aufgenommen, wodurch eine kräftemäßige Entlastung des Schaufelformteiles aus Kunststoff erreicht wird, so dass dieses keine Längungen im Betrieb erfährt.According to the invention, this is achieved in that the insert part is designed as a flat metal part which is adapted substantially to the shape of the blade molding and which has an uncoated planar fastening section in the fan blade root area. The blade molding is inventively designed as a plastic injection molded part. According to the invention, the attachment section does not protrude from the outer fan blade contour, but the attachment section is integrated in the blade contour. The flat planar design of the attachment portion allows easy mounting of the fan blade according to the invention with simultaneous alignment. Due to the inventive design, the fan impeller according to the invention in its interior with a large proportion of the insert itself, which can be made relatively thin, z. B. It can be made of a 2 mm thick sheet steel or be made of aluminum sheet. The plastic extrusion is such that a cover of the insert is achieved, however, the plastic volume can be kept low. The fastening section is preferably arranged approximately centrally in the fan blade foot region and extends directly from the edge of the foot region into the blade molding. As a result, a very uniform application of force in the fan blade wheel is possible and the drive and centrifugal forces are absorbed directly by the insert, whereby a kraftemäßige relief of the blade molding is made of plastic, so that this undergoes no elongation during operation.

Die Erfindung bezieht sich weiterhin auf ein Ventilatorrad unter Verwendung der erfindungsgemäßen Ventilatorschaufel.The invention further relates to a fan wheel using the fan blade according to the invention.

Vorteilhafte Ausbildungen der erfindungsgemäßen Ventilatorschaufel sind in den Unteransprüchen enthalten und an Hand der in den beiliegenden Zeichnungen dargestellten Ausführungsbeispiele wird die Erfindung näher erläutert. Es zeigen:

Fig. 1
eine Ansicht auf eine erfindungsgemäße Ventilatorschaufel,
Fig. 2
eine Ansicht auf die Ventilatorschaufel gemäß Fig. 1, jedoch in einem Längsschnitt oberhalb des Einlegeteils,
Fig. 3
das Einlegeteil gemäß Fig. 2 als Einzeldarstellung,
Fig. 4
eine Seitenansicht eines erfindungsgemäßen Einlegeteils,
Fig. 5
eine Ansicht eines erfindungsgemäßen Ventilatorrades,
Fig. 6
eine Einzelansicht eines erfindungsgemäßen Ventilatorrades gemäß Fig. 5.
Advantageous embodiments of the fan blade according to the invention are contained in the subclaims and with reference to the embodiments illustrated in the accompanying drawings, the invention is explained in more detail. Show it:
Fig. 1
a view of a fan blade according to the invention,
Fig. 2
a view of the fan blade according to Fig. 1 but in a longitudinal section above the insert,
Fig. 3
the insert according to Fig. 2 as an individual representation,
Fig. 4
a side view of an insert according to the invention,
Fig. 5
a view of a fan wheel according to the invention,
Fig. 6
a single view of a fan according to the invention according to Fig. 5 ,

Eine erfindungsgemäße Ventilatorschaufel besteht aus einem Schaufelkörper 1, der aus einem Einlegeteil 3 und einem dieses teilweise umhüllenden äußeren Schaufelformteil 2 gebildet ist. Das Einlegeteil 3 ist in dem Schaufelformteil 2 eingebettet und vollständig umschlossen bis auf seinen unbeschichteten Befestigungsabschnitt 4. Das Schaufelformteil 2 ist vorzugsweise als Kunststoffspritzteil hergestellt und das Einlegeteil 3 wird beim Spritzvorgang des Kunststoffspritzteils gleichzeitig umspritzt. Als Kunststoffmaterial wird insbesondere ein Polyamid-Kunststoff oder Polypropylen oder Polybutylenterephthalat (PBT) verwendet. Erfindungsgemäß kann es zweckmäßig sein, wenn das Einlegeteil 3 vor dem Umspritzen mit einer Primerschicht als Haftvermittler versehen ist. Wie sich aus Fig. 1 ergibt, bleibt der Befestigungsabschnitt 4 unbeschichtet, so dass hier das aus Metallblech bestehende Einlegeteil 3 unter unmittelbarer Anlage an einem Befestigungsflansch einer Nabe eines Ventilatorrades befestigt werden kann. Zur Befestigung weist der Befestigungsabschnitt 4 eine Bohrung 5 auf, durch die die erforderliche Befestigungsschraube 26 hindurchgesteckt werden kann. Weiterhin sind Ausrichtausnehmungen 6 im Befestigungsabschnitt 4 ausgebildet, in die angepasste Vorsprünge 24 am Befestigungsflansch 22 der Ventilatornabe 21 hineinpassen, siehe Fig. 5 und 6. Der Befestigungsabschnitt 4 ist eben und flächig ausgebildet, so dass die Anlage an dem entsprechenden Befestigungsflansch vollflächig möglich ist. Wie aus den Fig. 1 und 2 zu erkennen ist, ist der Befestigungsabschnitt 4 etwa mittig im Ventilatorschaufel-Fußbereich 7 angeordnet und erstreckt sich unmittelbar vom Rand 8 des Fußbereiches 7 in das Schaufelformteil 2 hinein. Das Einlegeteil 3 ragt somit mit seinem Befestigungsabschnitt 4 nicht über den Rand 8 heraus, sondern ist innerhalb des Schaufelformteiles 2 integriert. Wie insbesondere aus Fig. 4 zu erkennen ist, ist das Einlegeteil 3 ausgehend vom Befestigungsabschnitt 4 als gewölbtes Formteil ausgebildet. Hierbei ist eine Wölbung sowohl in Richtung der Längsachse Y-Y als auch in Richtung der Quer-Achse X-X vorhanden. Eine entsprechende Wölbung besitzt auch die erfindungsgemäße Ventilatorschaufel. Da der Befestigungsabschnitt 4 eben ausgebildet ist, wird dieser von einem gegensinnig gewölbten Übergangsbereich 10 umfasst. Weiterhin ist in den Fig. zu erkennen, dass das Einlegeteil 3 im dargestellten Ausführungsbeispiel zwei Versteifungsrippen 12 aufweist. Diese Versteifungsrippen 12 verlaufen speichenartig vom Umfang des Befestigungsabschnittes 4 in Richtung der Längserstreckung bzw. der Längsachse Y-Y des Schaufelkörpers 1 bzw. des Einlegeteils Diese Versteifungsrippen 12 sind in das Material des Einlegeteils 3 eingeprägt. Vorteilhafterweise besteht das Einlegeteil 3 aus einem Stahlblech bzw. einem Aluminiumblech mit einer Dicke von beispielsweise 2 mm. Weiterhin ist zu erkennen, dass das Einlegeteil 3 mehrere in seiner Fläche ausgebildete Durchbrechungen 13 aufweist, die insbesondere kreisförmig oder aber ellipsenförmig ausgebildet sein können. Durch diese Durchbrechungen 13 kann beim Umspritzen mit dem Kunststoffmaterial des Schaufelformteils 2 das Kunststoffmaterial hindurchtreten, so dass eine Durchverbindung des Kunststoffs beidseitig des Einlegeteils 3 erfolgt.A fan blade according to the invention consists of a blade body 1, which is formed from an insert part 3 and an outer blade molding part 2 which partially encloses it. The insert 3 is embedded in the blade molding 2 and completely enclosed except for its uncoated mounting portion 4. The blade molding 2 is preferably as Plastic injection molded part and the insert 3 is encapsulated during the injection process of the plastic injection molded part simultaneously. The plastic material used is in particular a polyamide plastic or polypropylene or polybutylene terephthalate (PBT). According to the invention, it may be expedient if the insert part 3 is provided with a primer layer as adhesion promoter before the extrusion coating. As it turned out Fig. 1 results, the mounting portion 4 remains uncoated, so that here the metal sheet consisting of insert 3 can be attached under direct contact with a mounting flange of a hub of a fan wheel. For attachment, the attachment portion 4 has a bore 5, through which the required fastening screw 26 can be inserted. Furthermore Ausrichtausnehmungen 6 are formed in the mounting portion 4, fit into the adapted projections 24 on the mounting flange 22 of the fan hub 21, see FIGS. 5 and 6 , The mounting portion 4 is flat and flat, so that the system is possible over the entire surface of the corresponding mounting flange. Like from the Fig. 1 and 2 can be seen, the attachment portion 4 is arranged approximately centrally in the fan blade foot region 7 and extends directly from the edge 8 of the foot region 7 in the blade molding part 2 inside. The insert 3 thus does not project beyond the edge 8 with its attachment section 4, but is integrated within the blade molding part 2. As in particular from Fig. 4 can be seen, the insert 3 is formed starting from the mounting portion 4 as a curved molding. In this case, a curvature is present both in the direction of the longitudinal axis YY and in the direction of the transverse axis XX. A corresponding curvature also has the fan blade according to the invention. Since the fastening portion 4 is flat, it is surrounded by an oppositely curved transition region 10. Furthermore, it can be seen in the figures that the insert part 3 has two stiffening ribs 12 in the exemplary embodiment shown. These stiffening ribs 12 extend in the manner of a spoke from the circumference of the fastening section 4 in the direction of the longitudinal extent or the longitudinal axis YY of the blade body 1 or of the insert part. These reinforcing ribs 12 are embossed into the material of the insert part 3. Advantageously, the insert part 3 consists of a steel sheet or an aluminum sheet with a thickness of for example 2 mm. Furthermore, it can be seen that the insert part 3 has a plurality of apertures 13 formed in its surface, which may be in particular circular or elliptical in shape. Through these openings 13, the plastic material can pass during encapsulation with the plastic material of the blade molding part 2, so that a through-connection of the plastic takes place on both sides of the insertion part 3.

Die Verteilung der Durchbrechungen 13 ist derart, dass die Mehrzahl der Durchbrechungen 13 zwischen dem Ende der Versteifungsrippen 12 und dem dem Fußabschnitt 7 des dem Schaufelformteil 2 gegenüberliegenden Ende sowie in Drehrichtung des Ventilatorschaufelrades bzw. der Ventilartorschaufel im Bereich zwischen den Versteifungsrippen 12 und der jeweiligen hinteren Längskante 11 der Ventilatorschaufel angeordnet sind. Somit sind die Durchbrechungen 13 derart und dort angeordnet, dass sie in den Bereichen vorhanden sind und eine Durchverbindung des Kunststoffmaterials gewährleisten, wo die größte Kunststoffüberlappung vorhanden ist. Auch sind Durchbrechungen 13 in der unmittelbaren Nachbarschaft des Übergangsabschnittes 10 ausgebildet. Indem die Versteifungsrippen 12 ebenfalls vollständig vom Kunststoffmaterial des Schaufelformteils 2 umschlossen sind, wird auch hier eine form- und kraftschlüssige Verbindung zwischen den beiden Körpern erreicht.The distribution of the apertures 13 is such that the plurality of apertures 13 between the end of the stiffening ribs 12 and the foot portion 7 of the blade forming part 2 opposite end and in the direction of rotation of the fan blade or the Ventilartorschaufel in the region between the stiffening ribs 12 and the respective rear Longitudinal edge 11 of the fan blade are arranged. Thus, the apertures 13 are arranged so and there that they are present in the areas and ensure a through connection of the plastic material, where the largest plastic overlap is present. Also, apertures 13 are formed in the immediate vicinity of the transition section 10. By the stiffening ribs 12 are also completely enclosed by the plastic material of the blade molding 2, a positive and non-positive connection between the two bodies is also achieved here.

In Fig. 2 ist zu erkennen, dass die Anpassung der Form des Einlegeteils 3 und der Form des Schaufelkörpers 1 derart ist, dass die Begrenzungskanten des Schaufelkörpers 1 und des Einlegeteils 3 im Fußbereich 7 aufeinanderfallen und die beiden gegenüberliegenden Begrenzungskanten in Längsrichtung Y-Y des Einlegeteils 3 sowie die entsprechenden Begrenzungskanten des Schaufelkörpers 1 derart zueinander verlaufen, dass zwischen diesen Kanten ausgehend vom Fußbereich 7 ein sich erweiternder Spaltbereich vorhanden ist. Hierbei ist der Spaltbereich 14 im Bereich der in Drehrichtung hinteren Begrenzungskanten 11, 11a sehr viel größer ausgebildet als der Spaltbereich 15 der in Drehrichtung vorderen Längskanten 11b, 11 c, d. h. im in Drehrichtung vorderen Bereich des Schaufelkörpers ist nur eine geringe Überlappung des Schaufelformteils 2 gegenüber dem Einlegeteil 3 vorhanden. Zweckmäßigerweise besitzt das Einlegeteil 3 eine maximale Länge 1, die etwa 60 % bis 85 %, vorzugsweise ca. 75 % bis 80 % der maximalen Länge L des Schaufelkörpers 1 beträgt. Weiterhin weist das Einlegeteils 3 eine maximale Breite b auf, die 35 % bis 60 %, vorzugsweise 38 % bis 53 % der maximalen Breite B des Schaufelkörpers 1 beträgt.In Fig. 2 It can be seen that the adaptation of the shape of the insert 3 and the shape of the blade body 1 is such that the boundary edges of the blade body 1 and the insert 3 in the foot region 7 coincide and the two opposite boundary edges in the longitudinal direction YY of the insert 3 and the corresponding boundary edges of the blade body 1 to each other in such a way that between these edges, starting from the foot region 7, an expanding gap region is present. In this case, the gap region 14 in the region of the rear boundary edges 11, 11a in the direction of rotation is much larger than the gap region 15 of the front longitudinal edges 11b, 11c in the direction of rotation, ie, only a slight overlap of the blade molding part 2 in the front region of the blade body in the direction of rotation the insert 3 available. Conveniently, the insert 3 has a maximum length 1, which is about 60% to 85%, preferably about 75% to 80% of the maximum length L of the blade body 1. Furthermore, the insert 3 has a maximum width b, which is 35% to 60%, preferably 38% to 53% of the maximum width B of the blade body 1.

Erfindungsgemäß wird somit eine Anpassung von Einlegeteil 3 und Schaufelformteil 2 erreicht, die zu einer optimalen Kraftverteilung innerhalb der Ventilatorschaufel führt, so dass Längenveränderungen des Ventilatorschaufelformteils 2 vermieden werden.According to the invention an adaptation of insert 3 and blade molding 2 is thus achieved, which leads to an optimal distribution of force within the fan blade, so that changes in length of the fan blade molding 2 are avoided.

Ein erfindungsgemäßes Ventilatorrad 20 besteht aus einer hohlzylindrischen Nabe 21, an deren Umfang Befestigungsflansche 22 ausgebildet sind. An diesen Befestigungsflanschen 22 sind die erfindungsgemäßen Ventilatorschaufeln befestigt. Die Nabe 21 besteht aus Aluminiumdruckguss oder aus Stahl und kann den Rotor eines Gleichstrommotors bilden. An die Befestigungsflansche 22 sind die erfindungsgemäßen Ventilatorschaufeln mit dem Befestigungsabschnitt 4 befestigt. Im Falle eines Aluminiumdruckgussrotors können die Befestigungsflansche 22 an den Rotor angegossen sein. Besteht der Rotor hingegen, wie in Fig. 5 und 6 dargestellt, aus Stahl, so sind die Befestigungsflansche 22 umfangsgemäß an die Nabe 21 angeschweißt. Die Befestigungsflansche 22 können zweckmäßigerweise als Stanzteile oder Stanzbiegeteile hergestellt sein. Auf Grund der erfindungsgemäßen Befestigung durch Anschweißen der Befestigungsflansche 22 kann die Größe und Ausrichtung der Schaufelformteile 2 beliebig variiert werden. Die Befestigungsflansche 22 können als Stahlblech-Stanzbiegeteil ausgebildet sein, das aus einem mittleren Anlageabschnitt 27 mit jeweils an seinen Längsseiten 28 umgebogenen Versteifungsstegen 29 besteht. Die Versteifungsstege 29 haben eine im Wesentlichen dreieckförmige Form, wobei die Versteifungsstege 29 zum freien Ende der Anlageabschnitte 27 spitz zulaufen. Es ergibt sich somit eine im Querschnitt U-förmige Ausbildung der Befestigungsflansche 22 insbesondere im unteren Befestigungsbereich, wo sie an die Nabe 21 angeschweißt sind.An inventive fan wheel 20 consists of a hollow cylindrical hub 21, on the periphery of mounting flanges 22 are formed. At these mounting flanges 22, the fan blades according to the invention are attached. The hub 21 is made of die-cast aluminum or steel and can form the rotor of a DC motor. To the mounting flanges 22, the fan blades according to the invention are attached to the mounting portion 4. In the case of an aluminum die cast rotor, the mounting flanges 22 may be cast on the rotor. Is the rotor, however, as in FIGS. 5 and 6 shown, made of steel, so the mounting flanges 22 are circumferentially welded to the hub 21. The mounting flanges 22 may be conveniently prepared as stampings or stamped and bent parts. Due to the attachment according to the invention by welding the mounting flanges 22, the size and orientation of the blade moldings 2 can be varied as desired. The mounting flanges 22 may be formed as a sheet steel stamped and bent part, which consists of a central abutment portion 27, each with its longitudinal sides 28 bent stiffening webs 29. The stiffening webs 29 have a substantially triangular shape, with the stiffening webs 29 tapering towards the free end of the abutment sections 27. This results in a cross-sectionally U-shaped design of the mounting flanges 22, in particular in the lower mounting area, where they are welded to the hub 21.

Die Erfindung ist nicht auf die dargestellten und beschriebenen Ausführungsbeispiele beschränkt, sondern umfaßt auch alle im Sinne der Erfindung gleichwirkenden Ausführungen. Ferner ist die Erfindung bislang auch noch nicht auf die im Anspruch 1 definierte Merkmalskombination beschränkt, sondern kann auch durch jede beliebige andere Kombination von bestimmten Merkmalen aller insgesamt offenbarten Einzelmerkmalen definiert sein. Dies bedeutet, dass grundsätzlich praktisch jedes Einzelmerkmal des Anspruchs 1 weggelassen bzw. durch mindestens ein an anderer Stelle der Anmeldung offenbartes Einzelmerkmal ersetzt werden kann. Insofern ist der Anspruch 1 lediglich als ein erster Formulierungsversuch für eine Erfindung zu verstehen.The invention is not limited to the illustrated and described embodiments, but also includes all the same in the context of the invention embodiments. Furthermore, the invention has hitherto not been limited to the feature combination defined in claim 1, but may also be defined by any other combination of specific features of all individually disclosed individual features. This means that in principle virtually every individual feature of claim 1 can be omitted or replaced by at least one individual feature disclosed elsewhere in the application. In this respect, the claim 1 is to be understood only as a first formulation attempt for an invention.

Claims (11)

  1. A fan blade for axial fans, having a blade body (1) consisting of an inner insert (3) and an outer shaped blade part (2), partially enveloping the latter, which is composed of a material less strong than that of the insert (3), wherein the insert (3) is in the form of a flat metal part, substantially adapted to the form of the blade body (1), which has an uncoated, plane securing region in the base region of the fan blade, wherein the securing portion (4) is arranged substantially centrally in the base region of the fan blade and extends directly from the edge of the base region (7) into the shaped blade part (2), characterised in that starting from the plane securing portion (4), the insert (3) has a curved contour both in the longitudinal direction of the blade body and the transverse direction of the blade body, and in that the securing portion (4) is enclosed, starting from the edge of the base region, by a transition region which is curved in an opposite direction thereto, wherein the insert (3) has a maximum length (I) of 60% to 85% of the maximum length (L) of the blade body (1) and has a maximum width (b) of 35% to 60% of the maximum width (B) of the blade body (1).
  2. A fan blade according to claim 1, characterised in that the shaped blade part (2) is in the form of a plastic injection moulded part.
  3. A fan blade according to one of claims 1 and 2, characterised in that the insert (3) has at least one stiffening rib (12) running, in a spoke-like manner, from the circumference of the securing portion (4) in the direction of the longitudinal axis (Y-Y) of the blade body (1).
  4. A fan blade according to any one of claims 1 to 3, characterised in that the insert (3) has a plurality of openings (13) formed in its surface.
  5. A fan blade according to claim 4, characterised in that the majority of the openings (13) are formed between the end of the stiffening rib (12) and the end, opposite the base portion (7), of the blade body (1), as well as in the region lying in the rotational direction of the fan blade and between the stiffening rib (12) and the longitudinal edge, lying in the rotational direction, of the blade body (1).
  6. A fan blade according to any one of claims 1 to 5, characterised in that the form of the insert (3) and the form of the blade body (1) are matched to one another such that the boundary edges of the blade body and the insert (3) coincide in the base region (7), and the two facing boundary edges (11a, 11c) in the longitudinal direction of the insert (3) and the corresponding boundary edges (11, 11b) of the blade body (1) are adapted to one another in such a manner that, starting from the base region (7), a widening gap region (14, 15) is formed between these edges.
  7. A fan blade according to any one of claims 1 to 6, characterised in that the insert (3) has a maximum length (I) of 75% to 80% of the maximum length (L) of the blade body (1).
  8. A fan blade according to any one of claims 1 to 7, characterised in that the insert (3) has a maximum width (b) of 38% to 53% of the maximum width (B) of the blade body (1).
  9. An impeller consisting of a hub (21) and of fan blades secured to mounting flanges (22) formed on the hub (21), characterised in that the fan blades are constructed according to any one of claims 1 to 8 and the mounting flanges (22) are composed of steel and are connected to the hub (21) by welding.
  10. An impeller according to claim 9, characterised in that the mounting flanges (22) are made of sheet steel and are in the form of shaped parts or shaped bent parts and are composed of a plane contact portion (27) and stiffening flanges (29) which are bent away at the two facing longitudinal sides (28) of the latter, wherein the contact portion of the mounting flanges (22) comes to rest against the securing portion (4) of the insert (3).
  11. An impeller consisting of a hub (21) and of fan blades secured to mounting flanges (22) formed on the hub (21), characterised in that the fan blades are constructed according to any one of claims 1 to 8 and both the hub (21) and the mounting flanges (22) are composed of die-cast aluminium and are integrally connected to one another.
EP07788132A 2006-08-03 2007-08-01 Fan blade Active EP2047107B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202006011898U DE202006011898U1 (en) 2006-08-03 2006-08-03 fan blade
PCT/EP2007/057963 WO2008015233A1 (en) 2006-08-03 2007-08-01 Fan blade

Publications (2)

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EP2047107A1 EP2047107A1 (en) 2009-04-15
EP2047107B1 true EP2047107B1 (en) 2011-01-12

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EP07788132A Active EP2047107B1 (en) 2006-08-03 2007-08-01 Fan blade

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US (1) US8167564B2 (en)
EP (1) EP2047107B1 (en)
CN (1) CN101473141B (en)
AT (1) ATE495368T1 (en)
DE (2) DE202006011898U1 (en)
ES (1) ES2356398T3 (en)
PT (1) PT2047107E (en)
WO (1) WO2008015233A1 (en)

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Also Published As

Publication number Publication date
PT2047107E (en) 2011-02-01
ES2356398T3 (en) 2011-04-07
EP2047107A1 (en) 2009-04-15
CN101473141A (en) 2009-07-01
ATE495368T1 (en) 2011-01-15
US8167564B2 (en) 2012-05-01
DE202006011898U1 (en) 2007-12-13
WO2008015233A1 (en) 2008-02-07
CN101473141B (en) 2012-05-23
US20090324413A1 (en) 2009-12-31
DE502007006253D1 (en) 2011-02-24

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