EP1669610A1 - Axiallüfter - Google Patents

Axiallüfter Download PDF

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Publication number
EP1669610A1
EP1669610A1 EP04106529A EP04106529A EP1669610A1 EP 1669610 A1 EP1669610 A1 EP 1669610A1 EP 04106529 A EP04106529 A EP 04106529A EP 04106529 A EP04106529 A EP 04106529A EP 1669610 A1 EP1669610 A1 EP 1669610A1
Authority
EP
European Patent Office
Prior art keywords
blade
fan
section
blades
leading edge
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.)
Withdrawn
Application number
EP04106529A
Other languages
English (en)
French (fr)
Inventor
Tolga Dogan
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.)
Faz Elektrik Motor Makina Sanayi ve Ticaret AS
Original Assignee
Faz Elektrik Motor Makina Sanayi ve Ticaret AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Faz Elektrik Motor Makina Sanayi ve Ticaret AS filed Critical Faz Elektrik Motor Makina Sanayi ve Ticaret AS
Priority to EP04106529A priority Critical patent/EP1669610A1/de
Publication of EP1669610A1 publication Critical patent/EP1669610A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • 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
    • F04D29/386—Skewed blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud

Definitions

  • the present invention relates to a multiple sweep fan for producing gas flow in the direction of center of rotation.
  • the term multiple sweep indicates a number of different sections along the leading edge and optionally the trailing edge of blades of the fan.
  • the fan is particularly designed as a back skewed or front skewed low noise axial fan.
  • An object of the present invention is to provide a backward or forward skewed low noise fan having enhanced flow rates.
  • Another object of the present invention is to provide and axial fan having reduced operational costs.
  • Yet another object of the present invention is to provide a fan which would require less motor power for outputting the same amount of physical flow and thereby to reduce the size, weight and cost of the electric motor used in especially in an HVAC system.
  • the present invention accomplishes above mentioned objects and provides a low noise axial fan having improved performance properties through use of novel design multiple sweep blades in the fans.
  • Each blade of a fan proposed by the present invention is divided into multiple sections along its leading and optionally trailing edges.
  • the leading edge on the first section which is closest to the hub of a blade is defined by a concave arc while the leading edges on the second and the subsequent sections are defined by convex arcs.
  • the trailing edge on the first section of a blade is defined by a concave arc while the trailing edges on the other sections are defined by convex arcs.
  • the radius and the center of these arcs determine the performance parameters of multiple sweep fans.
  • the center of the arc which forms the leading edge of the blade stands in the upstream locations for the first section which is closest to the hub, whereas the center of the arc which forms the leading edge of the blade stands in the downstream locations for the second and each subsequent sections, if there is any.
  • the leading edge of a blade resembles the leading edge of an eagle wing in the attack position.
  • Upper projection of an eagle wing shows a concave arc on the proximity of the eagle's body and a sharp convex arc between the second end of the concave arc and the wing tip.
  • the axial flow fan (10) comprises a set of blades (11) placed at symmetric angular locations around a central hub (20).
  • the blades (11) are conventionally secured at their root end (21) to the hub which is generally driven by a rotating shaft or which comprises a motor located within a part of said hub (20).
  • the leading edge of a blade is neither defined by a straight line nor by one or more circular arcs of the same type as typically encountered in classical back or forward skewed fans. Instead, the leading edge of a blade is typically divided in a number of sections (s1, s2, s3....S n ).
  • the first section s1 is defined in the form of a concave arc whereas the second the third sweep sections (s2, s3) are defined in the form of convex arcs.
  • the outer ends (22) of the blades (11) in the preferred embodiment are secured in a conventional manner by means of an outer stiffening ring (26).
  • the blades (11) according to the present invention have varying pitch with respect to the rotation plane of the fan (10). While the preferred embodiment of the present invention has a constant variation pitch, the pitch of a blade may decrease in constant or variable ratios from the hub (20) to the outer ring (26) as a function of the radius. Similarly, the chord length (t) of a blade changes as a function of the radial distance from the hub.
  • the outer ends (22) of the blades (11) are secured to a ring (13) continuously along their full transversal dimension.
  • the leading edge of a blade according to the present invention forms a concave arc on its first sweep section starting immediately around the perimeter of the hub and extending in the radial direction.
  • the center of this concave arc defining the first weep sections s1 is marked as C1 located at a point of (R1, ⁇ 1) in the angular coordinates as shown in Fig. 1.
  • the leading edge forms a convex arc on the second sweep section which starts immediately at the end of the first sweep section s1 and extends in the radial direction.
  • the center of this convex arc of the second sweep section is marked as C2 which is defined at a point of (R2, 02) as shown in Fig. 1.
  • the example shown in the figures have a third sweep section which having a center marked as (R3, 03) in the same figure 1 and ending at the outer stiffening ring (26). It is an essential part of the present invention that center point of an arc forming the leading edge of at least one section is located in the lower part of the quadratic plane while center point of another arc forming the leading edge of at least one other section is located in the upper part of the quadratic plane when the center of the transversal dimension at the root of a blade is located on the x-axis.
  • the blades (11) have maximum pitch ( ⁇ ) at their root ends at which they are fixed to the hub (20). Apart from that, the leading edges of the blades increasingly protrude towards front at the inner parts whereas the trailing edges of the blades protrude towards rear as shown in Fig 3-b.
  • the distance k1 on the front of the fan and the distance (k-k1-k2) on the rear of the fan denote the maximum protrusion amounts marked in the vicinity of the hub respectively on the leading edges and on the trailing edges.
  • Angular deflections shown in Fig 5-b and 5-c help to understand the slight protrusions which become more apparent towards the inner parts of the fan.
  • the projection k1 of Fig. 3-b will be apparent upon examination of ⁇ 1 and ⁇ 2 of Fig. 5-c and 5-b respectively. These angular deflections are found to accord the eagle wing like shape of the blades on the x-y plane and correspond to a higher elevation in the inner parts of a wing. It is also found that these help to maintain a uniform flow in the downstream area, which is of utmost importance in HVAC systems.
  • the leading edges of the blades when looked at the side view Fig. 3-b of the fan (10), do not form a flat plane and protrude (k1) towards the upstream area more in the central regions so as to form an elliptic spheroid on their front. Likewise, the trailing edges also protrude (k-k1-k2) towards the downstream area.
  • Fig. 6-a shows five equally spaced stations between Da and Di to illustrate the variation in the chord length and twist angle (attack angle) of a blade.
  • Fig. 6-b. shows that the twist angle ( ⁇ ) with respect to the plane of rotation decreases along the radial direction.
  • chord length (t) and twist angle ( ⁇ ) are very important two parameters determining the performance characteristics of an axial fan. Since the principle underlying the present invention relates to performance enhancement through use of different sections defined by the circular characteristics of the leading edges and optionally the trailing edges of blades of a fan, no more explanation with regard to the transversal dimension or the twist angle will be given here.
  • F(y) is the function which defines the leading edge of a blade
  • x is the coordinate in the horizontal plane
  • r i is the radius of the hub
  • r a is radius of the stiffening ring (26)
  • A, B, C, D, E are constant coefficients.
  • the hub (20), blades (11) and ring (26) according to the present invention are preferably made out of a single, integral unit molded from a plastic material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP04106529A 2004-12-13 2004-12-13 Axiallüfter Withdrawn EP1669610A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04106529A EP1669610A1 (de) 2004-12-13 2004-12-13 Axiallüfter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04106529A EP1669610A1 (de) 2004-12-13 2004-12-13 Axiallüfter

Publications (1)

Publication Number Publication Date
EP1669610A1 true EP1669610A1 (de) 2006-06-14

Family

ID=34930046

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04106529A Withdrawn EP1669610A1 (de) 2004-12-13 2004-12-13 Axiallüfter

Country Status (1)

Country Link
EP (1) EP1669610A1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103161755A (zh) * 2011-12-16 2013-06-19 利雅路热能设备(上海)有限公司 工业用风扇叶轮
JP2014066187A (ja) * 2012-09-26 2014-04-17 Panasonic Corp 扇風機
WO2015146013A1 (ja) * 2014-03-25 2015-10-01 パナソニックＩｐマネジメント株式会社 扇風機用のプロペラファン、扇風機
WO2016142255A1 (de) * 2015-03-11 2016-09-15 Voith Patent Gmbh Axiallaufrad und ventilator mit einem solchen axiallaufrad
CN106762823A (zh) * 2016-12-28 2017-05-31 东莞市卓奇电子科技有限公司 多流道轴流风聚焦叶轮
CN107477022A (zh) * 2017-08-25 2017-12-15 佛山市南海九洲普惠风机有限公司 一种梯形扭曲风叶
WO2019090243A1 (en) 2017-11-06 2019-05-09 Isaacs Hydropermutation Technologies, Inc. Machine and process for filterless wet removal of particles from and humidification of air
WO2022113631A1 (ja) * 2020-11-27 2022-06-02 株式会社デンソー ファン装置
CN114962325A (zh) * 2022-06-20 2022-08-30 太仓欣华盈电子有限公司 一种高效能扇叶及离心风扇

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737077A (en) * 1986-09-12 1988-04-12 Aciers Et Outillage Peugeot Profiled blade of a fan and its application in motor-driven ventilating devices
US5961289A (en) * 1995-11-22 1999-10-05 Deutsche Forshungsanstalt Fur Luft-Und Raumfahrt E.V. Cooling axial flow fan with reduced noise levels caused by swept laminar and/or asymmetrically staggered blades
EP0947704A2 (de) * 1998-03-30 1999-10-06 GATE S.p.A. Axiallüfter, insbesondere für Kraftfahrzeuge
US6368061B1 (en) * 1999-11-30 2002-04-09 Siemens Automotive, Inc. High efficiency and low weight axial flow fan
US20030012656A1 (en) * 2001-06-12 2003-01-16 Kyung Seok Cho Axial flow fan

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737077A (en) * 1986-09-12 1988-04-12 Aciers Et Outillage Peugeot Profiled blade of a fan and its application in motor-driven ventilating devices
US5961289A (en) * 1995-11-22 1999-10-05 Deutsche Forshungsanstalt Fur Luft-Und Raumfahrt E.V. Cooling axial flow fan with reduced noise levels caused by swept laminar and/or asymmetrically staggered blades
EP0947704A2 (de) * 1998-03-30 1999-10-06 GATE S.p.A. Axiallüfter, insbesondere für Kraftfahrzeuge
US6368061B1 (en) * 1999-11-30 2002-04-09 Siemens Automotive, Inc. High efficiency and low weight axial flow fan
US20030012656A1 (en) * 2001-06-12 2003-01-16 Kyung Seok Cho Axial flow fan

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103161755B (zh) * 2011-12-16 2017-03-08 利雅路热能设备(上海)有限公司 工业用风扇叶轮
CN103161755A (zh) * 2011-12-16 2013-06-19 利雅路热能设备(上海)有限公司 工业用风扇叶轮
JP2014066187A (ja) * 2012-09-26 2014-04-17 Panasonic Corp 扇風機
WO2015146013A1 (ja) * 2014-03-25 2015-10-01 パナソニックＩｐマネジメント株式会社 扇風機用のプロペラファン、扇風機
JP2015183605A (ja) * 2014-03-25 2015-10-22 パナソニックＩｐマネジメント株式会社 扇風機用のプロペラファン
CN106133330A (zh) * 2014-03-25 2016-11-16 松下知识产权经营株式会社 电风扇用的螺旋桨风扇、电风扇
CN106133330B (zh) * 2014-03-25 2018-12-28 松下知识产权经营株式会社 电风扇用的螺旋桨风扇、电风扇
US10670044B2 (en) 2015-03-11 2020-06-02 Voith Patent Gmbh Axial impeller and fan having such an axial impeller
WO2016142255A1 (de) * 2015-03-11 2016-09-15 Voith Patent Gmbh Axiallaufrad und ventilator mit einem solchen axiallaufrad
CN106762823A (zh) * 2016-12-28 2017-05-31 东莞市卓奇电子科技有限公司 多流道轴流风聚焦叶轮
CN107477022A (zh) * 2017-08-25 2017-12-15 佛山市南海九洲普惠风机有限公司 一种梯形扭曲风叶
WO2019090243A1 (en) 2017-11-06 2019-05-09 Isaacs Hydropermutation Technologies, Inc. Machine and process for filterless wet removal of particles from and humidification of air
EP3707388A4 (de) * 2017-11-06 2021-08-04 Isaacs Hydropermutation Technologies, Inc. Maschine und verfahren zum filterlosen nassentfernung von partikeln aus und zur befeuchtung von luft
US11143195B2 (en) 2017-11-06 2021-10-12 Isaacs Hydropermutation Technologies, Inc. Machine and process for filterless wet removal of particles from and humidification of air
WO2022113631A1 (ja) * 2020-11-27 2022-06-02 株式会社デンソー ファン装置
CN114962325A (zh) * 2022-06-20 2022-08-30 太仓欣华盈电子有限公司 一种高效能扇叶及离心风扇

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