EP3029336A1 - Blade of a fan wheel, fan wheel and axial fan - Google Patents

Blade of a fan wheel, fan wheel and axial fan Download PDF

Info

Publication number
EP3029336A1
EP3029336A1 EP15189976.2A EP15189976A EP3029336A1 EP 3029336 A1 EP3029336 A1 EP 3029336A1 EP 15189976 A EP15189976 A EP 15189976A EP 3029336 A1 EP3029336 A1 EP 3029336A1
Authority
EP
European Patent Office
Prior art keywords
blade
projection
fan wheel
outer edge
radial outer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15189976.2A
Other languages
German (de)
French (fr)
Other versions
EP3029336B1 (en
Inventor
Daniel Gebert
Erhard Gruber
Oliver Haaf
Thorsten Pissarczyk
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.)
Ebm Papst Mulfingen GmbH and Co KG
Original Assignee
Ebm Papst Mulfingen 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
Priority claimed from DE102015100767.3A external-priority patent/DE102015100767A1/en
Application filed by Ebm Papst Mulfingen GmbH and Co KG filed Critical Ebm Papst Mulfingen GmbH and Co KG
Publication of EP3029336A1 publication Critical patent/EP3029336A1/en
Application granted granted Critical
Publication of EP3029336B1 publication Critical patent/EP3029336B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • F04D29/384—Blades characterised by form
    • 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
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/301—Cross-sectional characteristics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/303—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the leading edge of a rotor blade
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/307—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the tip of a rotor blade

Definitions

  • the invention relates to a blade of a fan wheel, a fan wheel of an axial fan and an axial fan with such a fan wheel.
  • the inflow of the air influences the noise of the Ventillatorrades in operation. Especially shortly before stalling, flow disturbances can lead to high turbulence and interaction with the blade leading edges. In addition to the unwanted noise, the turbulences also have a negative effect on the efficiency, especially in the upper pressure range.
  • the invention is therefore based on the object to provide a blade construction, a fan wheel for an axial fan and an axial fan, which show improved noise behavior, especially in the upper pressure range at the same time higher efficiency and are less susceptible to Albertanströmungen.
  • a blade for a fan wheel is first proposed to solve the problem, which has a pressure-side, radially outwardly extending blade leading edge and a radial outer edge, wherein a transition from the radially outer edge to the blade leading edge with a circumferentially extending projection relative to the adjacent, is formed radially outwardly extending blade leading edge, so that the blade edge width increases in a projection having radial outer edge portion locally limited to the projection, wherein a transition from the radially outer edge portion to a radially inner portion of the respective blade is formed fluent.
  • a fan wheel of an axial fan is proposed to solve the further object, having a plurality of blades described above.
  • the radially outer edge portion is defined as a radially outer portion of the respective blade lying portion in the extension of which the projection is formed in the circumferential direction. In the radial direction, the radial outer edge portion is bounded on the outside by the radial outer edge of the respective blade.
  • the blade edge width is defined as the blade width in the circumferential direction at an imaginary edge before, seen in the radial direction, the radial outer edge portion having the projection begins. The blade leading edges extend radially outwardly to the radially outward edge portion before passing into the projection located in the radially outer edge portion.
  • the noise is reduced in the high pressure range, especially in the gap area in an application with fan and fixed wall ring.
  • the projection on the individual blades is each nose-shaped as an extension of the radial outer edge portion and projects in the direction of rotation of the blade relative to the respective adjacent, radially outwardly extending, pressure-side blade leading edges in the circumferential direction.
  • the projection is the element which introduces the air engagement and the flow to the blade. The flow along the blade and in particular along the radially outer edge portion is significantly influenced by the projection.
  • the shape of the projection is also advantageous that it is oval in cross-section, more preferably elliptical.
  • the wider section of the oval or elliptical cross section in this case preferably points in the direction of Axialradkarmays, ie along the blade leading edges to the center.
  • the projection tapers in the circumferential direction and is substantially hemispherical in shape, so that the hemisphere head ensures the foremost flow engagement of the respective blade.
  • the projection protrudes in the circumferential direction over a length of 1-20%, in particular 1-10%, more preferably 5-10% of the blade edge width from the adjacent blade leading edge.
  • the blade edge width is measured as described above at the imaginary edge to the radially outer, the projection having region.
  • the length of the projection can then be determined in dependence thereon. Thus, it is sufficient even a small length of the projection in the circumferential direction relative to the adjacent blade edge width in order to achieve the advantageous effects.
  • the noise generation and efficiency increase are further promoted by the fact that the blades are formed in the respective radial outer edge portion in the front portion adjacent to the blade leading edges with a thickening, i. are formed thicker in the axial direction.
  • a thickening is the rear portion of the blades, which adjoins the blade trailing edges and has an unchanged standard thickness. It is thus provided that the blades in the front section have an axial thickness which is greater than an axial thickness in the rear section adjoining the blade trailing edges. The transition of the change in thickness from front section to rear section is flowing.
  • the radial outer edge portion of the fan wheel in the radial direction has a length of 5%, more preferably of 2.5% of the radius of the fan wheel. It follows that only the radial outermost region of the blades is geometrically adjusted with the thickening and the projection.
  • the extent of the thickening in the circumferential direction is also defined geometrically. It is advantageous if the axially thickened front portion has a width in the circumferential direction, which corresponds to 50%, more preferably up to 70% of the blade edge width. The thickening decreases substantially steadily from the front section towards the rear section.
  • the rear portion itself can be formed just with constant thickness.
  • the fan wheel according to the invention is provided in a further embodiment that along the axial outer edge of the respective blade in the axial direction with a predetermined angle of attack bent winglet is formed, the course passes in the circumferential direction in the projection.
  • the basic use of winglets on blades is known, but according to the invention, the winglet acts by a one-piece design with the projection and the thickening together and promotes noise reduction and efficiency.
  • the angle of attack of the winglet with respect to an adjacent plane determined by the blade surface is lower in the front section or in the region of the projection than in the rear section.
  • the invention also includes an axial fan having a stationary wall ring within which a fan wheel described above rotates.
  • the embodiments of the fan wheel according to the invention are particularly effective Positive when used with wall ring, since particularly strong turbulence occur in the gap area between wall ring and fan wheel.
  • FIG. 1 1 shows a plan view of a fan wheel 1 of an axial fan, which has a plurality of blades 2 extending radially outward from a central hub region, with respective pressure side, radially outwardly extending, curved blade leading edges 3 and blade trailing edges 10 and arcuate radial outer edges 4.
  • Each of the blades 2 is identical, so that the description for one blade is identical for all the rest.
  • transition 5 from the radial outer edges 4 to the blade leading edges 3 is formed in each case with a circumferentially extending projection 6 with respect to the adjacent, radially outwardly extending blade leading edges 3.
  • the projection 5 protrudes beyond an imaginary connecting line K of the outermost radial edge points of the geometrically unchanged blade leading edge 3.
  • FIG. 2 shows a detail view X from FIG. 1 ,
  • the radial outer edge section 7 is marked adjacent to the radial outer edge 4 of the blade 2, in the extension thereof in the circumferential direction of the projection 6 is formed.
  • the blade edge width Sb is defined as the blade width in the circumferential direction at an imaginary edge, before seen in the radial direction of the radially outer edge portion 7 having the projection 6 begins.
  • the radial outer edge portion 7 has a length L in the radial direction of 2.5% of the radius of the fan wheel.
  • the blade leading edges 3 extend radially outward to the radially outer edge portion 7 before they pass into the lying in the radially outer edge portion 7 projection 6.
  • the protruding length 6 of the projection 6 protruding beyond the adjacent blade leading edge 3 corresponds approximately to 6.5% of the blade edge width Sb.
  • the projection 6 is designed as a nose-shaped protruding extension of the radial outer edge portion 7 with a substantially hemispherical end.
  • FIG. 2 several sections AA to EE marked in the FIGS. 3a-3e are playing.
  • FIGS. 3a-3g let recognize the geometric shape of the blade 2 in the radial outer edge portion 7.
  • the projection 6 has according to FIG. 3a an elliptical cross section, which merges into the shape of the radially and circumferentially adjacent blade 2.
  • a front section 8 is determined; in a region adjoining the blade trailing edges 10, a rear section 9 is determined.
  • the areas 8, 9 merge into one another, but the axial thickness D1 in the front section 8 is greater than the axial thickness D2 in the rear section 9 Figures 3c and 3f reproduced with a thickness difference of over 20%.
  • the thickening extends circumferentially over a width Bu of 70% of the blade edge width Sb measured from the front blade edge 3.
  • FIG. 3g also shown in the radial direction is a thickening in the region of the projection 6 and the adjacent portion.
  • a winglet 11 bent in the axial direction with a predetermined angle of attack is integrally formed on the blade 2, as is shown in FIG. 3f can be seen.
  • the course of the winglet 11 merges into the projection 6 in the front section 8.
  • the angle of attack of the winglet 11 is reduced in the front section 8 and in the region of the projection 6 relative to the rear section 9.
  • FIGS. 4 and 5 Figure 12 shows graphs for demonstrating the improved noise and efficiency of the fan wheel 1 over a prior art comparative fan wheel without the features of the present invention. It is in FIG. 4 the comparison of the generated pressure difference, in FIG. 5 the comparison of the difference of the sound power level of the fan wheel according to the invention (line P) over the prior art (line O) shown. It turns out that with the inventive design of the blades 2 according to a FIG. 4 uniform pressure curve is reached, which is in accordance with FIG. 5 reflected in a reduced sound level.
  • FIG. 6 shows an example of the application of the fan wheel 1 from FIG. 1 with a wall ring 20, wherein between the wall ring 20 and the fan wheel 1, a circumferential gap 21 remains, which contributes especially to the increased noise.
  • this is with the use of the fan 1 from FIG. 1 in the in FIG. 4 and 5 shown reduced accordingly.
  • the invention is not limited in its execution to the above-mentioned preferred embodiments. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use.
  • the shape of the blades can be made variable.
  • the previously chosen orientations, e.g. "in the circumferential direction”, are then transferred accordingly to the shape of the blades.
  • an extension would not result "in the circumferential direction” but "in the direction of the radial blade outer edge”.
  • the solution according to the invention remains unchanged.

Landscapes

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

Abstract

Die Erfindung betrifft insbesondere ein Ventilatorrad eines Axialventilators, das mehrere Schaufeln mit jeweils druckseitigen, sich radial auswärts erstreckenden Schaufelvorderkanten und radialen Außenkanten aufweist, wobei ein Übergang von den radialen Außenkanten zu den Schaufelvorderkanten jeweils mit einem sich in Umfangsrichtung erstreckenden Vorsprung gegenüber den angrenzenden, sich radial auswärts erstreckenden Schaufelvorderkanten gebildet ist, wobei ein Übergang von dem radialen Außenrandabschnitt (7) zu einem radial weiter innen liegenden Bereich der jeweiligen Schaufel fließend ausgebildet ist.More particularly, the invention relates to a fan impeller of an axial fan having a plurality of blades each having pressure side, radially outwardly extending blade leading edges and radially outer edges, a transition from the radially outer edges to the blade leading edges each having a circumferentially extending projection opposite the adjacent ones outwardly extending blade leading edges, wherein a transition from the radially outer edge portion (7) to a radially inner portion of the respective blade is formed fluent.

Description

Die Erfindung betrifft eine Schaufel eines Ventilatorrades, ein Ventilatorrad eines Axialventilators sowie einen Axialventilator mit einem derartigen Ventilatorrad.The invention relates to a blade of a fan wheel, a fan wheel of an axial fan and an axial fan with such a fan wheel.

Bei Ventilatorrädern von Axialventilatoren, insbesondere bei Ausführungen mit Wandring liegt bekanntermaßen die Hauptgeräuschquelle im radialen Außenrandbereich der Schaufeln, da hier die Strömungsgeschwindigkeiten sehr hoch sind. Bei einer Ausführung mit Wandring ist zwischen den radialen Schaufelenden des Ventilatorrads und dem Wandring ein kleiner Spalt vorgesehen, in dessen Bereich es aufgrund hoher Turbulenzen ebenfalls leicht zu einer erhöhten Geräuschbildung kommt.In fan wheels of axial fans, especially in versions with wall ring is known to be the main noise source in the radial outer edge region of the blades, since the flow rates are very high. In a version with a wall ring, a small gap is provided between the radial blade ends of the fan wheel and the wall ring, in its region it is also light due to high turbulence to increased noise.

Ferner beeinflusst die Zuströmsituation der Luft die Geräuschentwicklung des Ventillatorrades im Betrieb. Insbesondere kurz vor dem Strömungsabriss können Störungen der Strömung zu hoher Turbulenz und einer Interaktion mit den Schaufelvorderkanten führen. Neben den unerwünschten Geräuschen wirken sich die Turbulenzen insbesondere im oberen Druckbereich auch negativ auf den Wirkungsgrad aus.Furthermore, the inflow of the air influences the noise of the Ventillatorrades in operation. Especially shortly before stalling, flow disturbances can lead to high turbulence and interaction with the blade leading edges. In addition to the unwanted noise, the turbulences also have a negative effect on the efficiency, especially in the upper pressure range.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Schaufelkonstruktion, ein Ventilatorrad für einen Axialventilator und einen Axialventilator bereit zu stellen, die ein verbesserter Geräuschverhalten insbesondere im oberen Druckbereich bei gleichzeitig höherer Effizienz zeigen und gegenüber Fehlanströmungen unempfindlicher sind.The invention is therefore based on the object to provide a blade construction, a fan wheel for an axial fan and an axial fan, which show improved noise behavior, especially in the upper pressure range at the same time higher efficiency and are less susceptible to Fehlanströmungen.

Diese Aufgabe wird durch die Merkmalskombinationen gemäß der Patentansprüche 1, 2 und 15 gelöst.This object is achieved by the combination of features according to claims 1, 2 and 15.

Erfindungsgemäß wird zur Lösung der Aufgabe zunächst eine Schaufel für ein Ventilatorrad vorgeschlagen, das eine druckseitige, sich radial auswärts erstreckende Schaufelvorderkante und eine radiale Außenkante aufweist, wobei ein Übergang von der radialen Außenkante zu der Schaufelvorderkante mit einem sich in Umfangsrichtung erstreckenden Vorsprung gegenüber der angrenzenden, sich radial auswärts erstreckenden Schaufelvorderkante gebildet ist, so dass sich die Schaufelrandbreite in einem den Vorsprung aufweisenden radialen Außenrandabschnitt lokal begrenzt um den Vorsprung vergrößert, wobei ein Übergang von dem radialen Außenrandabschnitt zu einem radial weiter innen liegenden Bereich der jeweiligen Schaufel fließend ausgebildet ist.According to the invention, a blade for a fan wheel is first proposed to solve the problem, which has a pressure-side, radially outwardly extending blade leading edge and a radial outer edge, wherein a transition from the radially outer edge to the blade leading edge with a circumferentially extending projection relative to the adjacent, is formed radially outwardly extending blade leading edge, so that the blade edge width increases in a projection having radial outer edge portion locally limited to the projection, wherein a transition from the radially outer edge portion to a radially inner portion of the respective blade is formed fluent.

Erfindungsgemäß wird zur Lösung der weiteren Aufgabe ein Ventilatorrad eines Axialventilators vorgeschlagen, das mehrere vorstehend beschriebene Schaufeln aufweist. Im Folgenden werden Weiterbildungen des Ventilatorrades beschrieben, die explizit auch für jede Ausbildung der Schaufeln allein, d.h. unabhängig von dem Ventilatorrad gelten, um eine Ausbildung gemäß Patentanspruch 1 weiterzubilden.According to the invention, a fan wheel of an axial fan is proposed to solve the further object, having a plurality of blades described above. Below are developments of the fan wheel described, which apply explicitly for each formation of the blades alone, ie independently of the fan wheel to develop a training according to claim 1.

Der radiale Außenrandabschnitt ist definiert als radial im Außenbereich der jeweiligen Schaufel liegender Abschnitt, in dessen Verlängerung in Umfangsrichtung der Vorsprung ausgebildet ist. In radialer Richtung wird der radiale Außenrandabschnitt außenseitig von der radialen Außenkante der jeweiligen Schaufel begrenzt. Die Schaufelrandbreite ist definiert als die Schaufelbreite in Umfangsrichtung an einem gedachten Rand, bevor in radialer Richtung gesehen der den Vorsprung aufweisende radiale Außenrandabschnitt beginnt. Die Schaufelvorderkanten erstrecken sich radial auswärts bis zum radialen Außenrandabschnitt bevor sie in den im radialen Außenrandabschnitt liegenden Vorsprung übergehen.The radially outer edge portion is defined as a radially outer portion of the respective blade lying portion in the extension of which the projection is formed in the circumferential direction. In the radial direction, the radial outer edge portion is bounded on the outside by the radial outer edge of the respective blade. The blade edge width is defined as the blade width in the circumferential direction at an imaginary edge before, seen in the radial direction, the radial outer edge portion having the projection begins. The blade leading edges extend radially outwardly to the radially outward edge portion before passing into the projection located in the radially outer edge portion.

Durch die besondere geometrische Ausgestaltung des radialen Außenrandes der Schaufeln im Übergang zu der jeweiligen Schaufelvorderkante mit einem Vorsprung, verringert sich die Geräuschbildung im hohen Druckbereich, insbesondere auch im Spaltbereich bei einer Anwendung mit Ventilatorrad und feststehendem Wandring.Due to the special geometric design of the radial outer edge of the blades in the transition to the respective blade leading edge with a projection, the noise is reduced in the high pressure range, especially in the gap area in an application with fan and fixed wall ring.

In einer vorteilhaften Ausführung ist der Vorsprung an den einzelnen Schaufeln jeweils nasenförmig als Verlängerung des radialen Außenrandabschnitts ausgebildet und steht in die Drehrichtung der Schaufel gegenüber der jeweils angrenzenden, sich radial auswärts erstreckenden, druckseitigen Schaufelvorderkanten in Umfangsrichtung hervor. Dadurch ist der Vorsprung das den Lufteingriff und die Strömung zur Schaufel einleitende Element. Die Strömung entlang der Schaufel und insbesondere entlang des radialen Außenrandabschnitts wird maßgeblich von dem Vorsprung beeinflusst.In an advantageous embodiment, the projection on the individual blades is each nose-shaped as an extension of the radial outer edge portion and projects in the direction of rotation of the blade relative to the respective adjacent, radially outwardly extending, pressure-side blade leading edges in the circumferential direction. As a result, the projection is the element which introduces the air engagement and the flow to the blade. The flow along the blade and in particular along the radially outer edge portion is significantly influenced by the projection.

Bezüglich der Form des Vorsprungs ist weiter vorteilhaft, dass er im Querschnitt oval, weiter bevorzugt elliptisch ausgebildet ist. Der breitere Abschnitt des ovalen bzw. elliptischen Querschnitts weist dabei vorzugsweise in Richtung des Axialradmittelpunktes, d.h. entlang der Schaufelvorderkanten zur Mitte. Ferner ist in einer Ausführungsvariante vorgesehen, dass sich der Vorsprung in Umfangsrichtung gesehen verjüngt und im Wesentlichen halbkugelförmig ausgebildet ist, so dass der Halbkugelkopf den vordersten Strömungseingriff der jeweiligen Schaufel gewährleistet.With respect to the shape of the projection is also advantageous that it is oval in cross-section, more preferably elliptical. The wider section of the oval or elliptical cross section in this case preferably points in the direction of Axialradmittelpunktes, ie along the blade leading edges to the center. Furthermore, it is provided in a variant embodiment that the projection tapers in the circumferential direction and is substantially hemispherical in shape, so that the hemisphere head ensures the foremost flow engagement of the respective blade.

In einer Ausführungsvariante der Erfindung ist vorgesehen, dass der Vorsprung in Umfangsrichtung über eine Länge von 1 - 20%, insbesondere 1 - 10%, weiter bevorzugt 5 - 10% der Schaufelrandbreite von der angrenzenden Schaufelvorderkante hervorsteht. Die Schaufelrandbreite wird wie oben beschrieben am gedachten Rand zum radial äußeren, den Vorsprung aufweisenden Bereich gemessen. Die Länge des Vorsprungs kann dann in Abhängigkeit hierzu bestimmt werden. Es reicht mithin bereits eine geringe Länge des Vorsprungs in Umfangsrichtung relativ zur angrenzenden Schaufelrandbreite, um die vorteilhaften Effekte zu erzielen.In an embodiment variant of the invention, it is provided that the projection protrudes in the circumferential direction over a length of 1-20%, in particular 1-10%, more preferably 5-10% of the blade edge width from the adjacent blade leading edge. The blade edge width is measured as described above at the imaginary edge to the radially outer, the projection having region. The length of the projection can then be determined in dependence thereon. Thus, it is sufficient even a small length of the projection in the circumferential direction relative to the adjacent blade edge width in order to achieve the advantageous effects.

Neben der Verwendung des Vorsprungs werden die Geräuschbildung und Effizienzsteigerung ferner dadurch begünstigt, dass die Schaufeln in dem jeweiligen radialen Außenrandabschnitt in dem an die Schaufelvorderkanten angrenzenden Vorderabschnitt mit einer Verdickung ausgebildet sind, d.h. in axialer Richtung dicker ausgebildet sind. Als Bezugsgröße zum Vergleich der Verdickung dient der Hinterabschnitt der Schaufeln, der an die Schaufelhinterkanten angrenzt und eine unveränderte Standarddicke aufweist. Es ist somit vorgesehen, dass die Schaufeln im Vorderabschnitt eine axiale Dicke aufweisen, die größer ist als eine axiale Dicke im an die Schaufelhinterkanten angrenzenden Hinterabschnitt. Der Übergang der Dickenänderung von Vorderabschnitt zu Hinterabschnitt ist dabei fließend.In addition to the use of the projection, the noise generation and efficiency increase are further promoted by the fact that the blades are formed in the respective radial outer edge portion in the front portion adjacent to the blade leading edges with a thickening, i. are formed thicker in the axial direction. As a reference for comparing the thickening is the rear portion of the blades, which adjoins the blade trailing edges and has an unchanged standard thickness. It is thus provided that the blades in the front section have an axial thickness which is greater than an axial thickness in the rear section adjoining the blade trailing edges. The transition of the change in thickness from front section to rear section is flowing.

Günstig ist ferner, wenn der radiale Außenrandabschnitt des Ventilatorrades in radialer Richtung eine Länge von 5%, weiter bevorzugt von 2,5 % des Radius des Ventilatorrades aufweist. Daraus ergibt sich, dass lediglich der radial äußerste Bereich der Schaufeln geometrisch mit der Verdickung und dem Vorsprung angepasst ist.It is also advantageous if the radial outer edge portion of the fan wheel in the radial direction has a length of 5%, more preferably of 2.5% of the radius of the fan wheel. It follows that only the radial outermost region of the blades is geometrically adjusted with the thickening and the projection.

Die Erstreckung der Verdickung in Umfangsrichtung ist ebenfalls geometrisch definiert. Dabei ist vorteilhaft, wenn der axial aufgedickte Vorderabschnitt eine Breite in Umfangsrichtung aufweist, die 50%, weiter bevorzugt bis zu 70% der Schaufelrandbreite entspricht. Die Verdickung nimmt von dem Vorderabschnitt in Richtung Hinterabschnitt im Wesentlichen stetig ab. Der Hinterabschnitt selbst kann eben mit konstanter Dicke ausgebildet sein.The extent of the thickening in the circumferential direction is also defined geometrically. It is advantageous if the axially thickened front portion has a width in the circumferential direction, which corresponds to 50%, more preferably up to 70% of the blade edge width. The thickening decreases substantially steadily from the front section towards the rear section. The rear portion itself can be formed just with constant thickness.

Bei dem erfindungsgemäßen Ventilatorrad ist in einem weiteren Ausführungsbeispiel vorgesehen, dass entlang der axialen Außenkante der jeweiligen Schaufel ein in axialer Richtung mit einem vorbestimmten Anstellwinkel gebogenes Winglet ausgebildet ist, dessen Verlauf in Umfangsrichtung in den Vorsprung übergeht. Die grundsätzliche Verwendung von Winglets an Schaufeln ist bekannt, jedoch wirkt erfindungsgemäß das Winglet durch eine einstückige Ausbildung mit dem Vorsprung und der Aufdickung zusammen und fördert die Geräuschreduzierung und Effizienzsteigerung.In the fan wheel according to the invention is provided in a further embodiment that along the axial outer edge of the respective blade in the axial direction with a predetermined angle of attack bent winglet is formed, the course passes in the circumferential direction in the projection. The basic use of winglets on blades is known, but according to the invention, the winglet acts by a one-piece design with the projection and the thickening together and promotes noise reduction and efficiency.

In einer Weiterentwicklung ist der Anstellwinkel des Winglets gegenüber einer angrenzenden, durch die Schaufeloberfläche bestimmten Ebene im Vorderabschnitt beziehungsweise im Bereich des Vorsprungs geringer als in dem Hinterabschnitt. Dadurch wird die Strömung im druckseitigen radial äußeren Bereich der Schaufelvorderkante zunächst wesentlich durch die geometrische Anpassung mittels Vorsprung und Aufdickung, im in Strömungsrichtung nachfolgenden Bereich der Schaufeln zunehmend durch das Winglet beeinflusst.In a further development, the angle of attack of the winglet with respect to an adjacent plane determined by the blade surface is lower in the front section or in the region of the projection than in the rear section. As a result, the flow in the pressure-side radially outer region of the blade leading edge is initially influenced substantially by the geometric adaptation by means of projection and thickening, in the region of the blades following in the flow direction increasingly by the winglet.

Die Erfindung umfasst auch einen Axialventilator mit einem feststehenden Wandring, innerhalb dessen ein oben beschriebenes Ventilatorrad rotiert. Die erfindungsgemäßen Ausführungen des Ventilatorades wirken sich besonders positiv bei einer Verwendung mit Wandring aus, da im Spaltbereich zwischen Wandring und Ventilatorrad besonders starke Turbulenzen auftreten.The invention also includes an axial fan having a stationary wall ring within which a fan wheel described above rotates. The embodiments of the fan wheel according to the invention are particularly effective Positive when used with wall ring, since particularly strong turbulence occur in the gap area between wall ring and fan wheel.

Sämtliche dargelegten Merkmale der einzelnen Ausführungsvarianten sind frei kombinierbar, soweit dies technisch möglich ist. Andere vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet bzw. werden nachstehend zusammen mit der Beschreibung der bevorzugten Ausführung der Erfindung anhand der Figuren näher dargestellt. Es zeigen:

Fig. 1
eine Draufsicht auf ein Ventilatorrad,
Fig. 2
eine Detailansicht X aus Figur 1,
Fig. 3a-3g
Schnittansichten des Ventilatorrades aus Figur 1,
Fig. 4
ein Diagramm zum Vergleich des erzeugten Druckunterschieds des erfindungsgemäßen Ventilatorrades gegenüber dem Stand der Technik,
Fig. 5
ein Diagramm zum Vergleich des Unterschieds des Schalleistungspegels des erfindungsgemäßen Ventilatorrades gegenüber dem Stand der Technik,
Fig. 6
einen Axialventilator mit Ventilatorrad und Wandring.
All features of the individual variants are freely combinable, as far as this is technically possible. Other advantageous developments of the invention are characterized in the subclaims or are shown in more detail below together with the description of the preferred embodiment of the invention with reference to FIGS. Show it:
Fig. 1
a top view of a fan wheel,
Fig. 2
a detailed view of X from FIG. 1 .
Fig. 3a-3g
Section views of the fan wheel off FIG. 1 .
Fig. 4
a diagram for comparing the generated pressure difference of the fan wheel according to the invention over the prior art,
Fig. 5
a diagram for comparing the difference of the sound power level of the fan wheel according to the invention over the prior art,
Fig. 6
an axial fan with fan wheel and wall ring.

Figur 1 zeigt eine Draufsicht auf ein Ventilatorrad 1 eines Axialventilators, das mehrere, sich von einem mittigen Nabenbereich radial auswärts erstreckende Schaufeln 2 mit jeweils druckseitigen, sich radial auswärts erstreckenden, geschwungen Schaufelvorderkanten 3 und Schaufelhinterkanten 10 sowie bogenförmigen radialen Außenkanten 4 aufweist. Jede der Schaufeln 2 ist identisch ausgebildet, so dass die Beschreibung für eine Schaufel identisch für alle übrigen gilt. FIG. 1 1 shows a plan view of a fan wheel 1 of an axial fan, which has a plurality of blades 2 extending radially outward from a central hub region, with respective pressure side, radially outwardly extending, curved blade leading edges 3 and blade trailing edges 10 and arcuate radial outer edges 4. Each of the blades 2 is identical, so that the description for one blade is identical for all the rest.

Der Übergang 5 von den radialen Außenkanten 4 zu den Schaufelvorderkanten 3 ist jeweils mit einem sich in Umfangsrichtung erstreckenden Vorsprung 6 gegenüber den angrenzenden, sich radial auswärts erstreckenden Schaufelvorderkanten 3 gebildet. Der Vorsprung 5 steht dabei jeweils über eine gedachte Verbindungslinie K der äußersten radialen Randpunkte der geometrisch unveränderten Schaufelvorderkante 3 hervor.The transition 5 from the radial outer edges 4 to the blade leading edges 3 is formed in each case with a circumferentially extending projection 6 with respect to the adjacent, radially outwardly extending blade leading edges 3. In this case, the projection 5 protrudes beyond an imaginary connecting line K of the outermost radial edge points of the geometrically unchanged blade leading edge 3.

Figur 2 zeigt eine Detailansicht X aus Figur 1. Im radial äußersten Bereich ist angrenzend zur radialen Außenkante 4 der Schaufel 2 der radiale Außenrandabschnitt 7 gekennzeichnet, in dessen Verlängerung in Umfangsrichtung der Vorsprung 6 ausgebildet ist. Die Schaufelrandbreite Sb wird definiert als die Schaufelbreite in Umfangsrichtung an einem gedachten Rand, bevor in radialer Richtung gesehen der den Vorsprung 6 aufweisende radiale Außenrandabschnitt 7 beginnt. Der radiale Außenrandabschnitt 7 weist dabei eine Länge L in radialer Richtung von 2,5 % des Radius des Ventilatorrades auf. FIG. 2 shows a detail view X from FIG. 1 , In the radially outermost region, the radial outer edge section 7 is marked adjacent to the radial outer edge 4 of the blade 2, in the extension thereof in the circumferential direction of the projection 6 is formed. The blade edge width Sb is defined as the blade width in the circumferential direction at an imaginary edge, before seen in the radial direction of the radially outer edge portion 7 having the projection 6 begins. The radial outer edge portion 7 has a length L in the radial direction of 2.5% of the radius of the fan wheel.

Die Schaufelvorderkanten 3 erstrecken sich radial auswärts bis zum radialen Außenrandabschnitt 7, bevor sie in den im radialen Außenrandabschnitt 7 liegenden Vorsprung 6 übergehen. Durch den Vorsprung 6 wird die Schaufelrandbreite Sb in dem den Vorsprung 6 aufweisenden radialen Außenrandabschnitt 7 lokal begrenzt um den Vorsprung 6 erweitert, so dass der radiale Außenrandabschnitt 7 eine Breite Sb zuzüglich der Länge des Vorsprungs 6 aufweist. Die gegenüber der angrenzenden Schaufelvorderkante 3 überstehende Länge des Vorsprungs 6 in Umfangsrichtung entspricht in der gezeigten Ausführung in etwa 6,5% der Schaufelrandbreite Sb. Der Vorsprung 6 ist dabei als nasenförmige vorstehende Verlängerung des radialen Außenrandabschnitts 7 mit im Wesentlichen halbkugelköpfigem Abschluss ausgebildet. In Umfangsrichtung sind in Figur 2 mehrere Schnitte A-A bis E-E eingezeichnet, die in den Figuren 3a - 3e wiedergeben sind. Ferner ist ein in Figur 2 gekennzeichneter Schnitt in Umfangsrichtung G-G in Figur 3g dargestellt.The blade leading edges 3 extend radially outward to the radially outer edge portion 7 before they pass into the lying in the radially outer edge portion 7 projection 6. By the projection 6, the blade edge width Sb in which the projection 6 having radial outer edge portion 7 locally limited by the projection 6 expands, so that the radial outer edge portion 7 has a width Sb plus the length of the projection 6. In the embodiment shown, the protruding length 6 of the projection 6 protruding beyond the adjacent blade leading edge 3 corresponds approximately to 6.5% of the blade edge width Sb. The projection 6 is designed as a nose-shaped protruding extension of the radial outer edge portion 7 with a substantially hemispherical end. In the circumferential direction are in FIG. 2 several sections AA to EE marked in the FIGS. 3a-3e are playing. Furthermore, an in FIG. 2 marked section in the circumferential direction GG in FIG. 3g shown.

Die Schnitte der Figuren 3a - 3g lassen die geometrische Form der Schaufel 2 im radialen Außenrandabschnitt 7 erkennen. Der Vorsprung 6 weist gemäß Figur 3a einen elliptischen Querschnitt auf, der fließend in die Form der sich radial und in Umfangsrichtung anschließenden Schaufel 2 übergeht.The cuts of FIGS. 3a-3g let recognize the geometric shape of the blade 2 in the radial outer edge portion 7. The projection 6 has according to FIG. 3a an elliptical cross section, which merges into the shape of the radially and circumferentially adjacent blade 2.

In einem an die Schaufelvorderkanten 3 angrenzenden Bereich ist ein Vorderabschnitt 8, in einem an die Schaufelhinterkanten 10 angrenzenden Bereich ein Hinterabschnitt 9 bestimmt. Die Bereiche 8, 9 gehen fließend ineinander über, jedoch ist die axiale Dicke D1 im Vorderabschnitt 8 größer als die axiale Dicke D2 im Hinterabschnitt 9. Beispielhaft ist dies in den Figuren 3c und 3f mit einem Dickenunterschied von über 20% wiedergegeben. Die Aufdickung erstreckt sich in Umfangsrichtung über eine Breite Bu von 70% der Schaufelrandbreite Sb gemessen von der vorderen Schaufelkante 3. Wie in Figur 3g dargestellt, erfolgt auch in radialer Richtung eine Aufdickung im Bereich des Vorsprungs 6 und dem angrenzenden Abschnitt.In a region adjoining the blade leading edges 3, a front section 8 is determined; in a region adjoining the blade trailing edges 10, a rear section 9 is determined. The areas 8, 9 merge into one another, but the axial thickness D1 in the front section 8 is greater than the axial thickness D2 in the rear section 9 Figures 3c and 3f reproduced with a thickness difference of over 20%. The thickening extends circumferentially over a width Bu of 70% of the blade edge width Sb measured from the front blade edge 3. As in FIG FIG. 3g also shown in the radial direction is a thickening in the region of the projection 6 and the adjacent portion.

Entlang der axialen Außenkante 4 der Schaufel 2 ist ein in axialer Richtung mit einem vorbestimmten Anstellwinkel gebogenes Winglet 11 einstückig an der Schaufel 2 ausgebildet, wie es beispielsweise in Figur 3f zu erkennen ist. Der Verlauf des Winglets 11 geht im Vorderabschnitt 8 in den Vorsprung 6 über. Der Anstellwinkel des Winglets 11 wird im Vorderabschnitt 8 und im Bereich des Vorsprungs 6 gegenüber dem Hinterabschnitt 9 reduziert.Along the axial outer edge 4 of the blade 2, a winglet 11 bent in the axial direction with a predetermined angle of attack is integrally formed on the blade 2, as is shown in FIG FIG. 3f can be seen. The course of the winglet 11 merges into the projection 6 in the front section 8. The angle of attack of the winglet 11 is reduced in the front section 8 and in the region of the projection 6 relative to the rear section 9.

Die Figuren 4 und 5 zeigen Diagramme zum Nachweis der verbesserten Geräuschentwicklung und gesteigerten Effizienz des Ventilatorrades 1 gegenüber einem Vergleichsventilatorrad des Stands der Technik ohne die erfindungsgemäßen Merkmale. Dabei ist in Figur 4 der Vergleich des erzeugten Druckunterschieds, in Figur 5 der Vergleich des Unterschieds des Schalleistungspegels des erfindungsgemäßen Ventilatorrades (Linie P) gegenüber dem Stand der Technik (Linie O) dargestellt. Es zeigt sich, dass mit der erfindungsgemäßen Ausführung der Schaufeln 2 ein gemäß Figur 4 gleichmäßiger Druckverlauf erreichbar ist, der sich gemäß Figur 5 in einem reduzierten Schallpegel wiederspiegelt.The FIGS. 4 and 5 Figure 12 shows graphs for demonstrating the improved noise and efficiency of the fan wheel 1 over a prior art comparative fan wheel without the features of the present invention. It is in FIG. 4 the comparison of the generated pressure difference, in FIG. 5 the comparison of the difference of the sound power level of the fan wheel according to the invention (line P) over the prior art (line O) shown. It turns out that with the inventive design of the blades 2 according to a FIG. 4 uniform pressure curve is reached, which is in accordance with FIG. 5 reflected in a reduced sound level.

Figur 6 zeigt beispielhaft die Anwendung des Ventilatorrades 1 aus Figur 1 mit einem Wandring 20, wobei zwischen Wandring 20 und Ventilatorrad 1 ein Umfangsspalt 21 verbleibt, der besonders zur erhöhten Geräuschbildung beiträgt. Diese wird jedoch mit Verwendung des Ventilatorrad 1 aus Figur 1 in der in Figur 4 und 5 gezeigten Weise entsprechend reduziert. FIG. 6 shows an example of the application of the fan wheel 1 from FIG. 1 with a wall ring 20, wherein between the wall ring 20 and the fan wheel 1, a circumferential gap 21 remains, which contributes especially to the increased noise. However, this is with the use of the fan 1 from FIG. 1 in the in FIG. 4 and 5 shown reduced accordingly.

Die Erfindung beschränkt sich in ihrer Ausführung nicht auf die vorstehend angegebenen bevorzugten Ausführungsbeispiele. Vielmehr ist eine Anzahl von Varianten denkbar, welche von der dargestellten Lösung auch bei grundsätzlich anders gearteten Ausführungen Gebrauch macht. Beispielsweise kann die Form der Schaufeln variabel gestaltet werden. Die vorstehend gewählten Ausrichtungen, wie z.B. "in Umfangsrichtung", sind dann entsprechend auf die Form der Schaufeln zu übertragen. Bei geraden radialen Außenkanten der Schaufeln ergäbe sich in dem beispielhaft genannten Fall eine Erstreckung nicht "in Umfangsrichtung", sondern "in Richtung der radialen Schaufelaußenkante". Die erfindungsgemäße Lösung bleibt jedoch unverändert.The invention is not limited in its execution to the above-mentioned preferred embodiments. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use. For example, the shape of the blades can be made variable. The previously chosen orientations, e.g. "in the circumferential direction", are then transferred accordingly to the shape of the blades. With straight radial outer edges of the blades, in the example mentioned, an extension would not result "in the circumferential direction" but "in the direction of the radial blade outer edge". However, the solution according to the invention remains unchanged.

Claims (14)

Schaufel eines Ventilatorrades mit druckseitiger, sich radial auswärts erstreckender Schaufelvorderkante (3) und radialer Außenkante (4), wobei ein Übergang (5) von der radialen Außenkante (4) zu der Schaufelvorderkante (3) mit einem sich in Umfangsrichtung erstreckenden Vorsprung (6) gegenüber der angrenzenden, sich radial auswärts erstreckenden Schaufelvorderkante (3) gebildet ist, so dass sich eine Schaufelrandbreite (Sb) in einem den Vorsprung (6) aufweisenden radialen Außenrandabschnitt (7) lokal begrenzt um den Vorsprung (6) vergrößert, wobei ein Übergang von dem radialen Außenrandabschnitt (7) zu einem radial weiter innen liegenden Bereich der jeweiligen Schaufel fließend ausgebildet ist.Blade of a fan wheel with a pressure-side, radially outwardly extending blade leading edge (3) and radial outer edge (4), wherein a transition (5) from the radial outer edge (4) to the blade leading edge (3) with a circumferentially extending projection (6) is formed opposite to the adjacent radially outwardly extending blade leading edge (3) such that a blade edge width (Sb) in a projection (6) having radial outer edge portion (7) locally limited to the projection (6) increases, wherein a transition from the radial outer edge portion (7) is formed to a radially further inner region of the respective blade flowing. Ventilatorrad eines Axialventilators, das mehrere Schaufeln (2) mit jeweils druckseitigen, sich radial auswärts erstreckenden Schaufelvorderkanten (3) und radialen Außenkanten (4) aufweist, wobei ein Übergang (5) von den radialen Außenkanten (4) zu den Schaufelvorderkanten (3) jeweils mit einem sich in Umfangsrichtung erstreckenden Vorsprung (6) gegenüber den angrenzenden, sich radial auswärts erstreckenden Schaufelvorderkanten (3) gebildet ist, so dass sich eine Schaufelrandbreite (Sb) in einem den Vorsprung (6) aufweisenden radialen Außenrandabschnitt (7) jeweils lokal begrenzt um den Vorsprung (6) vergrößert.A fan of an axial fan, the plurality of blades (2) having each pressure side, radially outwardly extending blade leading edges (3) and radial outer edges (4), wherein a transition (5) from the radial outer edges (4) to the blade leading edges (3) respectively is formed with a circumferentially extending projection (6) opposite to the adjacent, radially outwardly extending blade leading edges (3), so that a blade edge width (Sb) in one of the projection (6) having radially outer edge portion (7) each locally limited increases the projection (6). Ventilatorrad nach Anspruch 2, dadurch gekennzeichnet, dass der Vorsprung (6) jeweils nasenförmig als Verlängerung des radialen Außenrandabschnitts (7) ausgebildet ist und gegenüber der jeweils angrenzenden, sich radial auswärts erstreckenden, druckseitigen Schaufelvorderkante (3) in Umfangsrichtung hervorsteht.Fan wheel according to claim 2, characterized in that the projection (6) is in each case nose-shaped as an extension of the radial outer edge portion (7) and protrudes relative to the respective adjacent, radially outwardly extending, pressure-side blade leading edge (3) in the circumferential direction. Ventilatorrad nach einem der vorigen Ansprüche 2 - 3, dadurch gekennzeichnet, dass der Vorsprung (6) in Umfangsrichtung über eine Länge von 1 - 20%, insbesondere 1 - 10%, der Schaufelrandbreite (Sb) von der angrenzenden Schaufelvorderkante (3) hervorsteht.Fan wheel according to one of the preceding claims 2 - 3, characterized characterized in that the projection (6) in the circumferential direction over a length of 1 - 20%, in particular 1 - 10%, the blade edge width (Sb) protrudes from the adjacent blade leading edge (3). Ventilatorrad nach einem der vorigen Ansprüche 2 - 4, dadurch gekennzeichnet, dass der jeweilige radiale Außenrandabschnitt (7) der Schaufeln (2) an die jeweilige radiale Außenkante (4) angrenzt und die Schaufeln (2) in dem jeweiligen radialen Außenrandabschnitt (7) in einem an die Schaufelvorderkanten (3) angrenzenden Vorderabschnitt (8) eine axiale Dicke (D1) aufweisen, die größer ist als eine axiale Dicke (D2) in einem an Schaufelhinterkanten (10) angrenzenden Hinterabschnitt (9).Fan wheel according to one of the preceding claims 2-4, characterized in that the respective radial outer edge portion (7) of the blades (2) adjacent to the respective radial outer edge (4) and the blades (2) in the respective radial outer edge portion (7) in a front section (8) adjoining the blade leading edges (3) has an axial thickness (D1) which is greater than an axial thickness (D2) in a rear section (9) adjoining the blade trailing edge (10). Ventilatorrad nach dem vorigen Anspruch, dadurch gekennzeichnet, dass der radiale Außenrandabschnitt (7) eine Länge (L) in radialer Richtung von 5%, insbesondere 2,5 % eines Ventilatorradradius aufweist.Fan wheel according to the preceding claim, characterized in that the radial outer edge portion (7) has a length (L) in the radial direction of 5%, in particular 2.5% of a Lüfterradradius. Ventilatorrad nach einem der vorigen Ansprüche 5 - 6, dadurch gekennzeichnet, dass der Vorderabschnitt (8) mit gegenüber dem Hinterabschnitt (9) vergrößerter axialer Dicke (D1) jeweils eine Breite (Bu) in Umfangsrichtung aufweist, die 50 - 70% der Schaufelrandbreite (Sb) entspricht.Fan wheel according to one of the preceding claims 5 - 6, characterized in that the front portion (8) with respect to the rear portion (9) of increased axial thickness (D1) each having a width (Bu) in the circumferential direction, the 50-70% of the blade edge width ( Sb) corresponds. Ventilatorrad nach einem der vorigen Ansprüche 5 - 7, dadurch gekennzeichnet, dass ein Übergang der axialen Dicke (D1) von dem Vorderabschnitt (8) zu dem Hinterabschnitt (9) fließend ausgebildet ist.Fan wheel according to one of the preceding claims 5-7, characterized in that a transition of the axial thickness (D1) of the front portion (8) to the rear portion (9) is formed fluent. Ventilatorrad nach einem der vorigen Ansprüche 2 - 8, dadurch gekennzeichnet, dass der Vorsprung (6) im Querschnitt oval ausgebildet ist.Fan wheel according to one of the preceding claims 2-8, characterized in that the projection (6) is oval in cross-section. Ventilatorrad nach einem der vorigen Ansprüche 2 - 9 dadurch gekennzeichnet, dass der Vorsprung (6) im Querschnitt elliptisch ausgebildet ist.Fan wheel according to one of the preceding claims 2 - 9 characterized characterized in that the projection (6) is elliptical in cross-section. Ventilatorrad nach einem der vorigen Ansprüche 2 - 10, dadurch gekennzeichnet, dass der Vorsprung (6) sich in Umfangsrichtung gesehen verjüngt und im Wesentlichen halbkugelförmig ausgebildet ist.Fan wheel according to one of the preceding claims 2-10, characterized in that the projection (6) tapers in the circumferential direction and is formed substantially hemispherical. Ventilatorrad nach einem der vorigen Ansprüche 2 - 11, dadurch gekennzeichnet, dass entlang der axialen Außenkante (4) der jeweiligen Schaufel (2) ein in axialer Richtung mit einem vorbestimmten Anstellwinkel gebogenes Winglet (11) ausgebildet ist, dessen Verlauf in den Vorsprung (6) übergeht.Fan wheel according to one of the preceding claims 2 - 11, characterized in that along the axial outer edge (4) of the respective blade (2) in the axial direction with a predetermined angle of attack bent winglet (11) is formed, whose course in the projection (6 ) passes over. Ventilatorrad nach dem vorigen Anspruch, dadurch gekennzeichnet, dass der Anstellwinkel im Vorderabschnitt (8) und/oder im Bereich des Vorsprungs (6) geringer ist als in dem Hinterabschnitt (9).Fan wheel according to the preceding claim, characterized in that the angle of attack in the front portion (8) and / or in the region of the projection (6) is less than in the rear portion (9). Axialventilator mit einem feststehenden Wandring (20) und einem innerhalb des Wandrings (20) rotierbaren Ventilatorrad (1) gemäß einem der vorigen Ansprüche 2 bis 13.Axial fan having a stationary wall ring (20) and a fan wheel (1) rotatable within the wall ring (20) according to one of the preceding claims 2 to 13.
EP15189976.2A 2014-12-03 2015-10-15 Blade of a fan wheel, fan wheel and axial fan Active EP3029336B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014117795 2014-12-03
DE102015100767.3A DE102015100767A1 (en) 2014-12-03 2015-01-20 Blade of a fan wheel, fan wheel and axial fan

Publications (2)

Publication Number Publication Date
EP3029336A1 true EP3029336A1 (en) 2016-06-08
EP3029336B1 EP3029336B1 (en) 2018-02-28

Family

ID=54325482

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15189976.2A Active EP3029336B1 (en) 2014-12-03 2015-10-15 Blade of a fan wheel, fan wheel and axial fan

Country Status (1)

Country Link
EP (1) EP3029336B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106837867A (en) * 2016-12-07 2017-06-13 浙江理工大学 Axial flow blower 3 d impeller with leaf vein texture and splitterr vanes
EP3705727A1 (en) * 2019-03-04 2020-09-09 ebm-papst Mulfingen GmbH & Co. KG Fan wheel of an axial fan

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11371517B2 (en) 2019-12-10 2022-06-28 Regal Beloit America, Inc. Hub inlet surface for an electric motor assembly
USD952830S1 (en) 2019-12-10 2022-05-24 Regal Beloit America, Inc. Fan shroud
USD938011S1 (en) 2019-12-10 2021-12-07 Regal Beloit America, Inc. Fan blade
USD938010S1 (en) 2019-12-10 2021-12-07 Regal Beloit America, Inc. Fan hub
US11555508B2 (en) 2019-12-10 2023-01-17 Regal Beloit America, Inc. Fan shroud for an electric motor assembly
USD938009S1 (en) 2019-12-10 2021-12-07 Regal Beloit America, Inc. Fan hub
US11859634B2 (en) 2019-12-10 2024-01-02 Regal Beloit America, Inc. Fan hub configuration for an electric motor assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3294315A (en) * 1964-09-28 1966-12-27 Buffalo Forge Co Fan construction
JPH01118000A (en) * 1987-10-30 1989-05-10 Matsushita Electric Ind Co Ltd Mixed flow fan
US5181830A (en) * 1991-11-21 1993-01-26 Chou Rudy S Blade for axial flow fan
JPH1144432A (en) * 1997-07-24 1999-02-16 Hitachi Ltd Air conditioner
JP2013213420A (en) * 2012-04-02 2013-10-17 Panasonic Corp Fan and outside unit using the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3294315A (en) * 1964-09-28 1966-12-27 Buffalo Forge Co Fan construction
JPH01118000A (en) * 1987-10-30 1989-05-10 Matsushita Electric Ind Co Ltd Mixed flow fan
US5181830A (en) * 1991-11-21 1993-01-26 Chou Rudy S Blade for axial flow fan
JPH1144432A (en) * 1997-07-24 1999-02-16 Hitachi Ltd Air conditioner
JP2013213420A (en) * 2012-04-02 2013-10-17 Panasonic Corp Fan and outside unit using the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106837867A (en) * 2016-12-07 2017-06-13 浙江理工大学 Axial flow blower 3 d impeller with leaf vein texture and splitterr vanes
CN106837867B (en) * 2016-12-07 2023-05-30 浙江理工大学 Axial flow fan ternary impeller with vein structure and splitter blades
EP3705727A1 (en) * 2019-03-04 2020-09-09 ebm-papst Mulfingen GmbH & Co. KG Fan wheel of an axial fan

Also Published As

Publication number Publication date
EP3029336B1 (en) 2018-02-28

Similar Documents

Publication Publication Date Title
EP3029336B1 (en) Blade of a fan wheel, fan wheel and axial fan
EP2646695B1 (en) Axial fan
WO2017041967A1 (en) Flow-conducting grille for arranging on a fan
EP3298284B1 (en) Flat flow-conducting grille
DE202015100241U1 (en) Blade of a fan wheel, fan wheel and axial fan
EP3705727A1 (en) Fan wheel of an axial fan
EP2746534B1 (en) Stator and/or rotor stage of a turbomachine and corresponding gas turbine
WO2016009037A1 (en) Wind-turbine rotor blade, rotor blade trailing edge, method for producing a wind-turbine rotor blade, and wind turbine
DE102021105225A1 (en) Fan and fan blades
EP3702620A1 (en) Axial fan with noise reducing fan impeller vanes having bores
EP3256732B1 (en) Impeller for a ventilator and ventilator
EP1500814A1 (en) Wind turbine rotor blade with wing tip
EP2827003B1 (en) Gas turbine compressor guide vane assembly
EP3571416B1 (en) Shrouded centrifugal fan impeller with a periodically and asymmetrically shaped shroud
EP3312427B1 (en) Ventilator with ventilator wheel and guide wheel
WO2019030205A1 (en) Rotor blade of a wind turbine rotor, wind turbine and method for improving the efficiency of a wind turbine rotor
DE102014219058A1 (en) Radial compressor impeller and associated centrifugal compressor
DE202019101209U1 (en) Fan wheel of an axial fan
DE202009009188U1 (en) Rotor blade for a Darrieus rotor
EP4283135A1 (en) Outlet flow guide device and fan with outlet flow guide device
EP2937525A1 (en) Aircraft engine
DE102022113141A1 (en) Diverting device and fan with diverting device
DE102022113142A1 (en) Diverting device and fan with diverting device
DE202015102578U1 (en) Eben Strömungsleitgitter
DE102020203966A1 (en) Compressors for a gas turbine and a gas turbine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

17P Request for examination filed

Effective date: 20161025

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20171019

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 974482

Country of ref document: AT

Kind code of ref document: T

Effective date: 20180315

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502015003188

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20180228

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180528

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180528

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180529

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 4

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502015003188

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20181129

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20181031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181015

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181031

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181031

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181015

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180228

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20151015

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180628

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 974482

Country of ref document: AT

Kind code of ref document: T

Effective date: 20201015

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201015

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230525

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20231025

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20231031

Year of fee payment: 9

Ref country code: FR

Payment date: 20231023

Year of fee payment: 9

Ref country code: DE

Payment date: 20231018

Year of fee payment: 9