EP3504443B1 - Axiallüfter mit optimierter schaufelverdrehung in der nähe zur laufradnabe - Google Patents

Axiallüfter mit optimierter schaufelverdrehung in der nähe zur laufradnabe Download PDF

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Publication number
EP3504443B1
EP3504443B1 EP17758042.0A EP17758042A EP3504443B1 EP 3504443 B1 EP3504443 B1 EP 3504443B1 EP 17758042 A EP17758042 A EP 17758042A EP 3504443 B1 EP3504443 B1 EP 3504443B1
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Prior art keywords
blade
axial flow
flow fan
angle
tip
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French (fr)
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EP3504443A1 (de
EP3504443C0 (de
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Jens Dybdahl
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Dacs AS
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Dacs AS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • 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

Definitions

  • the invention relates to an axial flow fan with an improved wing design.
  • Axial flow fans are well known in the art and many different designs have been proposed and manufactured in order to improve the performance of the fan, in particular with respect to generation of noise and improved power efficiency. It is an object of the present invention to provide an improved fan design to improve the efficiency of the fan.
  • an axial flow fan according to claim 1. It comprises a hub rotatable about an axis; an annular shroud extending concentric with said axis in a radial distance from said hub; a plurality of fan blades connected at a root end to said hub and having a free tip end extending radially towards said shroud, and a fan driver coupled to said hub and arranged for driving the rotation of said hub around the axis.
  • WO 2015/090318 also discloses an example of an axial flow fan with a number of the wings designed for reducing the power consumption by gradually angling the wings.
  • the chord angle in WO 2015/090318 is significantly steeper than the chord angle obtained with the above axial flow fan, which has shown to introduce an improved efficiency of 15% in terms of improved energy efficiency.
  • the angle ⁇ root deviates less than 1 ° from the curve defined by the equation within the root area.
  • substantially meant a deviation of up to 5°.
  • the angle ⁇ middle deviates less than 4° from the curve defined by the equation within the middle area.
  • the angle ⁇ middle deviates less than 3° from the curve defined by the equation within the middle area.
  • the angle ⁇ middle deviates less than 2° from the curve defined by the equation within the middle area.
  • the angle ⁇ middle deviates less than 1° from the curve defined by the equation within the middle area.
  • substantially meant a deviation of up to 5°.
  • the angle ⁇ tip deviates less than 4° from the curve defined by the equation within the tip area.
  • the angle ⁇ tip deviates less than 3° from the curve defined by the equation within the tip area.
  • the angle ⁇ tip deviates less than 2° from the curve defined by the equation within the tip area.
  • the angle ⁇ tip deviates less than 1° from the curve defined by the equation within the tip area.
  • R is in the range of 500 to 900 millimetres, such as 600 to 800 millimetres, or such as 650 to 750 millimetres.
  • the inner radius of the annular shroud is in the range of 600 to 1500 millimetres, such as 700 to 1300 millimetres, or such as 800 to 900 millimetres. The inner radius of the annular shroud is normally smaller than R.
  • the radius ( R hub ) of the hub is in the range of 50 to 150 millimetres, such as 60 to 120 millimetres, or such as 70 to 80 millimetres.
  • the fan may further comprise a diffuser arranged concentric with said axis at a downstream position of the annular shroud.
  • the diffuser has a conical shape with a diffusion angle in the range of 2 to 15° to the axisof rotation of the rotor, preferably in the range of 6 to 10°.
  • the fan may also further comprise an inlet part provided with a bellmouth arranged concentric with said axis at an upstream position of the annular shroud.
  • the hub comprises a seating part allowing the blades to be arranged in a plurality of blade pitch angles, and blade locking part for locking the blade pitch angle of the at least one blade into a specific blade pitch angle, wherein said locking part is designed to lock said blade into one specific blade pitch angle only.
  • the blades each comprises a recess cooperating with a corresponding pin of the locking part.
  • FIG. 1 An axial flow fan 1 according to an embodiment of the invention is shown in figures 1 and 2 , where figure 1 shows a perspective view of an axial flow fan 1 and figure 2 shows a longitudinal schematic cross-section of an axial flow fan 1.
  • the fan 1 comprises a hub 3 where to a plurality of fan blades 2 are connected at the root end 11 of the blades 2.
  • the free tip end 7 of the blades 2 extend radially towards the shroud 6 as shown in figure 2 .
  • the fan 1 in figure 1 has three blades 2, but may as well be equipped with any convenient number of blades 2. It is generally preferred that the rotor 5 of the fan comprises from 3 to 6 blades.
  • the fan has a fan driver (not shown) coupled to the hub 3 and arranged for driving the rotation of the hub 3 around the axis 4 shown in figure 2 .
  • the fan driver may be arranged in the hub 3 or next to the hub 3 and be connected thereto by means of a drive arrangement, e.g. a belt drive (not shown).
  • the hub 3 and the blades 2 form a rotor 5, which is rotated about an axis 4 (see figure 2 ) by means of the fan driver, e.g. a motor.
  • the rotor 5 is arranged inside the cylindrical shroud 6 which is concentric arranged about the axis 4 so there is a clearance between the tip 7 of the blades 2 and the shroud 6.
  • the rotation of the rotor 5 drives a flow of air axially through the fan 1 in the direction of the arrow A as shown in figure 2 .
  • the flow path through the fan 1 is illustrated by streamlines 8 indicated in figure 2 .
  • the shroud 6 is preceded by an inlet part 9 arranged upstream of the shroud, i.e. in the direction against the driven flow A, where the inlet part 9 also is concentric with the axis 4 and comprises a bellmouth to smoothen the flow at the inlet part 9 in order to avoid separation of the flow.
  • the passage of the air flow through the rotor 5 causes a pressure increase which is further increased by regained part of the kinetic energy present in of the air flow immediately after the rotor due to the axial velocity component by means of a diffuser 10 arranged downstream of the shroud 6 and concentric with the axis 4.
  • the diffuser 10 has a conical shape with an diffusion angle of 8.5° to the centre line, i.e. to the axis 4 of rotation of the rotor 5.
  • the blades 2 are attached by their root end 11 to the hub 3, preferably in a manner discussed later.
  • a cross section of a fan blade 2 is shown in figure 4 with indication of the leading edge 12 of the blade 2 as well as the trailing edge 13 of the blade 2.
  • the chord line 14 is extending between the leading edge 12 and the trailing edge 13, and the length of the chord of the blade 2 is defined by the distance between the leading edge 12 and the trailing edge 13.
  • the blade 2 is moved in the direction indicated as M on figure 4 due to the rotation of the rotor 5 of the fan 1 during operation thereof.
  • the angle ⁇ between the chord line 14 and the direction of movement M is indicated on figure 4 together with the direction A of the incoming air flow.
  • the direction A is depicted as being perpendicular to the direction M of movement which is generally the case for an axial flow fan 1.
  • Figure 5 shows a blade 2 according to the invention connected to by the root end 11 to a hub 3.
  • a number of cross sectional cut from the first cross sectional cut A-A starts at the root end 11 to the last cross sectional cut 40-40 at the tip end 7 of the blade 2 are marked in figure 5 .
  • the cross sectional cuts are evenly distributed over the length of the blade 2.
  • Figure 6 shows selected examples of the cross sectional cuts of the blade 2 shown in figure 5 .
  • the angle ⁇ between the chord line 14 and the direction of movement M are listed in the cross sectional cuts in figure 6 along with a value of the chord length.
  • Table 1 lists the values for the chord length, the angle ⁇ between the chord line 14 and the direction of movement M, the radial distance r at the different cross sectional cuts of the blade 2 shown in figure 5 .
  • Table 1 Cut r/R r ⁇ Chord ⁇ Eq. 1 Dev. Eq. 1 ⁇ Eq. 2 Dev. Eq. 2 Dev. Eq. 3 ⁇ Eq.
  • the first column of the table is the cross-sectional cut as seen in figure 5
  • the next four columns provide the parameters of the blade 2 as found by standard design tools
  • the last six columns are the chord angles ⁇ found by means of Eq. 1, Eq. 2 and Eq. 3, and the respective deviations between the calculated angles using Eq. 1, Eq. 2 and Eq. 3 and the measured angle.
  • the assembly in figure 1 also show a seating part 16 of the hub 3, three blades 2 and three locking parts 18 for an axial flow fan according to an aspect of the present invention.
  • the blades 2 are at the root end 11 equipped with a projection 15 that allows the individual blade 2 to be seated in a blade seating opening 17 of the seating part 16 at any pitch angle of the blade 2 as desired, the projections 15 being rotatable in the U-shaped seating openings 17.
  • the blade root protections 15 being equipped with a recess (not visible) designed for cooperating with a pin 20 having a rectangular cross-section, the pin 20 being extending from the body of a locking part 18 which is suited to the inserted into the blade seating opening 17 when the blade root projection 15 is in place so as to lock the pitch angle of the blade 2 to a specific blade pitch angle defined by the locking part 18.
  • FIG 7 is shown three different locking parts 18a, 18b, 18c where the pin 20a, 20b, 20c are arranged at different positions to define different pitch angles of the blade 2.
  • the locking parts 18a, 18b, 18c are provided with side tracks 19 to accommodate the edges of the blade seating opening 17 of the seating part 16 of the hub 3.

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

Claims (15)

  1. Axiallüfter (1), umfassend:
    - eine Nabe (3), die um eine Achse (4) drehbar ist;
    - eine ringförmige Ummantelung (6), die sich konzentrisch zu der Achse (4) in einem radialen Abstand von der Nabe (3) erstreckt;
    - eine Vielzahl von Lüfterschaufeln (2), die an einem Wurzelende (11) mit der Nabe (3) verbunden ist und ein freies Spitzenende (7) hat, das sich radial in Richtung der Ummantelung (6) erstreckt, und
    - einen Lüfterantrieb, der mit der Nabe gekoppelt und so angeordnet ist, dass er die Drehung der Nabe um die Achse antreibt,
    wobei, wenn R der radiale Abstand von der Achse (4) zum freien Spitzenende (7) der Schaufel und r der radiale Abstand von der Achse (4) ist, der Winkel θ zwischen einer Rotationsebene der Schaufeln und der Sehne jeder Schaufel an der radialen Position von r/R = 0,34 im Bereich von 20° bis 40° liegt, wobei der Axiallüfter dadurch gekennzeichnet ist, dass die Vielzahl von Lüfterschaufeln (2) jeweils einen Wurzelbereich umfasst, der sich von einer radialen Position von r/R = 0,17 zu einer radialen Position von r/R = 0,34 erstreckt, wobei der Wurzelbereich einen Wurzelwinkel ΔθWurzel hat, der sich zwischen der Sehne der Schaufel an einer beliebigen radialen Position im Wurzelbereich und der Sehne an der radialen Position von r/R = 0,34 erstreckt, wobei ΔθWurzel einer Kurve folgt, die definiert ist als: Δ θ Wurzel = arctan 0.375 ⋅ R r + 0.85 π − 31,9 ° ,
    Figure imgb0010
     und wobei der Winkel ΔθWurzel weniger als 1° von der durch die Gleichung definierten Kurve innerhalb des Wurzelbereichs abweicht.
  2. Axiallüfter nach Anspruch 1, wobei die Vielzahl von Lüfterschaufeln jeweils einen mittleren Bereich umfasst, der sich von der radialen Position von r/R=0,34 bis zur radialen Position von r/R=0,72 erstreckt, wobei der mittlere Bereich einen mittleren Winkel ΔθMitte hat, der sich zwischen der Sehne der Schaufel an einer beliebigen radialen Position im mittleren Bereich und der Sehne an der radialen Position von r/R=0,72 erstreckt, wobei ΔθMitte einer Kurve folgt, die definiert ist als: Δ θ Mitte = arctan 0.7 ⋅ R r − 0.1 π − 15.6 ° .
    Figure imgb0011
  3. Axiallüfter nach Anspruch 1 oder 2, wobei die Vielzahl von Lüfterschaufeln jeweils einen Spitzenbereich umfasst, der sich von der radialen Position von r/R=0,72 bis zur Spitze des freien Spitzenendes bei r/R=1 erstreckt, wobei der Spitzenbereich einen Spitzenwinkel ΔθSpitze hat, der sich zwischen der Sehne der Schaufel an einer beliebigen radialen Position im Spitzenbereich und der Sehne an der radialen Position von r/R=1 erstreckt, wobei ΔθSpitze einer Kurve folgt, die definiert ist als: Δ θ Spitze = arctan 0.2 ⋅ R r + 0.6 π − 14.3 ° .
    Figure imgb0012
  4. Axiallüfter nach einem der vorhergehenden Ansprüche, wobei der Winkel θ zwischen einer Rotationsebene der Schaufeln und der Sehen der Schaufel an der radialen Position von r/R=0,34 im Bereich von 25 bis 35° liegt.
  5. Axiallüfter nach einem der vorhergehenden Ansprüche, wobei:
    der Winkel ΔθMitte weniger als 4°, bevorzugt weniger als 3°, noch bevorzugter weniger als 2°, sogar noch bevorzugter weniger als 1° von der durch die Gleichung definierten Kurve im mittleren Bereich abweicht; und/oder
    der Winkel ΔθSpitze weniger als 4°, bevorzugt weniger als 3°, noch bevorzugter weniger als 2°, sogar noch bevorzugter weniger als 1° von der durch die Gleichung definierten Kurve innerhalb des Spitzenbereichs abweicht.
  6. Axiallüfter nach einem der vorhergehenden Ansprüche, wobei R im Bereich von 500 bis 900 Millimetern liegt.
  7. Axiallüfter nach einem der vorhergehenden Ansprüche, wobei die Sehne im Wurzelbereich von der Nabe aus in Richtung der radialen Position von r/R=0,34 zunimmt, bis zur radialen Position von r/R=0,40 abflacht und in Richtung der Spitze der Schaufel bei der radialen Position von r/R=1 abnimmt.
  8. Axiallüfter nach einem der vorhergehenden Ansprüche, wobei der Innenradius der ringförmigen Ummantelung im Bereich von 600 bis 1500 mm liegt.
  9. Axiallüfter nach einem der vorhergehenden Ansprüche, wobei der Radius (RNabe ) der Nabe im Bereich von 50 bis 150 Millimetern liegt.
  10. Axiallüfter nach einem der vorhergehenden Ansprüche, umfassend einen Diffusor (10), der konzentrisch zu der Achse (4) an einer stromabwärts gelegenen Position der ringförmigen Ummantelung (6) angeordnet ist.
  11. Axiallüfter nach Anspruch 10, wobei der Diffusor (10) eine konische Form mit einem Diffusionswinkel im Bereich von 2 bis 15° zur Achse (4) der Rotation des Rotors, vorzugsweise im Bereich von 6 bis 10°, hat.
  12. Axiallüfter nach einem der vorhergehenden Ansprüche, umfassend einen Einlassteil (9), der mit einer Glocke versehen ist, die konzentrisch zur Achse (4) an einer stromaufwärts gelegenen Position der ringförmigen Ummantelung (6) angeordnet ist.
  13. Axiallüfter nach einem der vorhergehenden Ansprüche, wobei die Nabe (3) umfasst
    - ein Aufnahmeteil (16), das es erlaubt, die Schaufeln (2) in einer Vielzahl von Schaufelanstellwinkeln anzuordnen, und
    - ein Schaufelverriegelungsteil (18) zum Verriegeln des Schaufelanstellwinkels der mindestens einen Schaufel (2) in einem bestimmten Schaufelanstellwinkel,
    wobei das Verriegelungsteil (18, 18a, 18b, 18c) so ausgelegt ist, dass es die Schaufel (2) nur in einem bestimmten Schaufelanstellwinkel verriegelt.
  14. Axiallüfter nach Anspruch 13, umfassend ein Verriegelungsteil (18, 18a, 18b, 18c) für jede der Schaufeln (2).
  15. Axiallüfter nach Anspruch 13 oder 14, wobei die Schaufeln (2) jeweils eine Ausnehmung umfassen, die mit einem entsprechenden Stift (20, 20a, 20b, 20c) des Verriegelungsteils (18, 18a, 18b, 18c) zusammenwirkt.
EP17758042.0A 2016-08-25 2017-08-22 Axiallüfter mit optimierter schaufelverdrehung in der nähe zur laufradnabe Active EP3504443B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201670645A DK179200B1 (en) 2016-08-25 2016-08-25 Improved wing for an axial flow fan
PCT/DK2017/050272 WO2018036598A1 (en) 2016-08-25 2017-08-22 Axial flow fan with optimised blade twist close to the impeller hub

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EP3504443A1 EP3504443A1 (de) 2019-07-03
EP3504443C0 EP3504443C0 (de) 2023-07-19
EP3504443B1 true EP3504443B1 (de) 2023-07-19

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DK (1) DK179200B1 (de)
ES (1) ES2951073T3 (de)
WO (1) WO2018036598A1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018229081A1 (fr) * 2017-06-12 2018-12-20 Valeo Systemes Thermiques Ventilateur de vehicule automobile

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2027745A (en) * 1933-09-13 1936-01-14 Jeffrey Mfg Co Ventilator
US4569632A (en) * 1983-11-08 1986-02-11 Airflow Research And Manufacturing Corp. Back-skewed fan
US6065937A (en) * 1998-02-03 2000-05-23 Siemens Canada Limited High efficiency, axial flow fan for use in an automotive cooling system
KR100332539B1 (ko) * 1998-12-31 2002-04-13 신영주 축류팬
US7249931B2 (en) * 2002-03-30 2007-07-31 University Of Central Florida Research Foundation, Inc. High efficiency air conditioner condenser fan with performance enhancements
BRPI0711849B1 (pt) * 2006-05-31 2019-09-10 Bosch Gmbh Robert conjunto de ventilador axial e ventilador axial
WO2015090318A1 (en) * 2013-12-17 2015-06-25 Dacs A/S Axial flow fan with blades twisted according to a blade pitch ratio that decreases (quasi) linearly with the radial position

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018229081A1 (fr) * 2017-06-12 2018-12-20 Valeo Systemes Thermiques Ventilateur de vehicule automobile

Also Published As

Publication number Publication date
EP3504443A1 (de) 2019-07-03
DK201670645A1 (en) 2018-01-29
EP3504443C0 (de) 2023-07-19
WO2018036598A1 (en) 2018-03-01
DK179200B1 (en) 2018-01-29
ES2951073T3 (es) 2023-10-17

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