EP2242932B1 - Meridionaler lüfter - Google Patents

Meridionaler lüfter Download PDF

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Publication number
EP2242932B1
EP2242932B1 EP09701751.1A EP09701751A EP2242932B1 EP 2242932 B1 EP2242932 B1 EP 2242932B1 EP 09701751 A EP09701751 A EP 09701751A EP 2242932 B1 EP2242932 B1 EP 2242932B1
Authority
EP
European Patent Office
Prior art keywords
fan
tip
blade
fan according
flange
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.)
Active
Application number
EP09701751.1A
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English (en)
French (fr)
Other versions
EP2242932A1 (de
Inventor
Anthony Geoffrey Sheard
Allessandro Corsini
Franco Rispoli
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.)
Howden Axial Fans AB
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Howden Axial Fans AB
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Publication date
Application filed by Howden Axial Fans AB filed Critical Howden Axial Fans AB
Publication of EP2242932A1 publication Critical patent/EP2242932A1/de
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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
    • 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
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps

Definitions

  • the present invention relates to meridional fans, particularly but not exclusively, to axial flow fans for large scale air ventilation and/or heating purposes in industrial buildings, industrial air conditioning units, underground railway systems and similar large infrastructures.
  • Such fans are typically located in a duct system and it is desirable for efficiency purposes for the area swept by the fan blades to be located in a cylindrical ring part of the duct system with a minimal clearance between the tips of the fan blades and the surface of the cylindrical ring.
  • the outer surface of the tips of the fan blades have a contour in the form of an arc corresponding to the circle swept by the fan blades.
  • the fan aerodynamic work input establishes a higher pressure downstream of the fan than upstream.
  • the pressure rise is obtained by means of aerodynamic forces at play when the air flows about the rotor blades.
  • Owing to the design of the blade a pressure difference is established between the blade pressure surface or side and its suction surface or side. The result of this pressure difference means that air tends to spill back over the tip of the fan from the high pressure to the low-pressure side. This air movement reduces the efficiency of the fan and also increases the noise generated by the fan.
  • a known method for reducing the amount of flow back air is to keep the gap between the fan tips and the cylindrical ring to a minimum and also to extend the length of the gap by incorporating on the tip of each blade an extending flange which increases the length of the gap in the direction of the leakage flow and thereby increases the resistance to flow back through the gap.
  • the present invention seeks to provide an improved form of a fan blade tip which increases the efficiency of the fan and at the same time reduces the noise generated by the fan.
  • the fan tips have, in the past, been made as a uniform as possible, but it has now, surprisingly, been discovered that a non uniform profile for certain sections of the blade tip can be advantageous in increasing the efficiency of the fan, reducing the power required to drive the fan at a given speed and pressure, and at the same time reducing the noise generated by the fan.
  • the uniform profile of the known conventional blade tips lead to the generation of tight vortices at the blade tip and it is believed that these vortices, when they reach a critical state suddenly expand very rapidly, to the extent of provoking vortex bursting or collapse, which generates a great deal of turbulence. This adverse effect is amplified if the vortices impinge on an adjacent fan blade at which point they burst on impact.
  • GB 2050530 (Papst) (D3) discloses an axial fan for impelling air through a duct and has a plurality of fan blades with peripheral blade tips having a leading edge, a trailing edge and a tip outer surface defining a leakage path between the tip and the duct ring.
  • the tip has a flange extending in the axial direction, but the whole tenor of the specification is that this is on the upstream side and it is entirely fortuitous that, for manufacturing reasons, certain embodiments have the tip extending onto the downstream high-pressure side as well. However there is no disclosure or teaching in the specification that it is important that the tip flange and hence the leakage path should extend into the high-pressure side.
  • FR 2753495 (Valeo) (D2) discloses a fan rotatable in a duct and in the leakage path between the outer tips of the fan blades and the duct provides means in the form of protuberances to minimise the width of the leakage path. There is no teaching of the desirability of having the leakage path on the high-pressure side nor the advantages of having a non-uniform leading edge.
  • a meridional fan adapted to be rotatably mounted in a duct ring of circular cross section for impelling air through the duct, and having a plurality of fan blades with peripheral blade tips having a width defining an arc with a circumferential extent describing, in operation, a circular path adjacent the duct ring, the blade tips each having a leading edge, a trailing edge and a tip outer surface, a leakage path being formed between the tip outer surface and the duct ring, at least one of the edges and/or the outer surface having a non-uniform profile for influencing the flow of air through the flow leakage path, characterised in that the or each tip has a flange extending in the axial direction on the downstream, high pressure side of the fan, which increases the length of the leakage flow path and wherein the leading edge of the flange has a non-uniform profile so that the circumferential axial extent of the leading edge of the flange varies along the width of the blade
  • the leading edge of the flange has an undulating profile.
  • the trailing edge of the blade tip includes a stepped shoulder extending at least partially across the width of the blade tip.
  • the stepped shoulder consists of a plurality of stepped recesses spaced across the width of the blade tip. These stepped recesses preferably are regularly spaced, but may be irregularly spaced.
  • Figure 3 illustrates a schematic cross-section through the axis of the fan and cylindrical ring 3 illustrating the peripheral flange 5 with its non-uniform leading edge 6.
  • the flange extends axially downstream on the high pressure side of the fan blade.
  • the effect of the high pressure on the blade pressure side means that air tends to spill backwards at the periphery of the fan tips through the gap between the fan tip 4 and the cylindrical ring 3 as illustrated by the arrow 7.
  • the gap thus forms a leakage flow path for air to flow from the high pressure, downstream side of the blade back to the upstream low pressure side and it is desirable to reduce this flow to a minimum.
  • the maximum pressure on the downside of the fan occurs in the boundary layer adjacent the fan face.
  • Figure 4 illustrates a scrap view of a fan blade 2 and its tip 4 in the direction of the arrow B in which the outer surface 8 of the tip has a non uniform profile in the circumferential direction formed by undulations. These undulations may be regular or irregular in size.
  • Figure 6 illustrates an alternative embodiment of a rear view of the blade tip in which a continuous stepped shoulder 9 is provided across the full width of the fan blade.
  • the peripherally extending flange 5 has a non-uniform dimension in the circumferential direction formed by a gradual curving of the leading edge 6.
  • the variation in the circumferential extent of the flange may be formed in a stepped manner with regular or irregularly spaced steps.

Landscapes

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

Claims (9)

  1. Meridionaler Lüfter ausgebildet, um drehbar in einem Kanalring (3) mit einem kreisförmigen Querschnitt befestigt zu werden zum Treiben von Luft durch den Kanal, und aufweisend eine Vielzahl von Lüfterblättern (2) mit peripheren Blattspitzen (4), die eine Breite aufweisen, die einen Bogen mit einer Umfangserstreckung definiert, die im Betrieb einen kreisförmigen Weg angrenzend an den Kanalring (3) beschreibt, wobei jede der Blattspitzen (4) eine Vorderkante (6), eine Hinterkante (9) und eine Spitzenaußenfläche (8) aufweist, wobei ein Kriechweg zwischen der Spitzenaußenfläche (8) und dem Kanalring (3) gebildet wird, wobei zumindest eines von der Kante (6) und/oder der Spitzenaußenfläche (8) ein ungleichmäßiges Profil aufweist zum Beeinflussen des Luftstroms durch den Strömungskriechweg, dadurch gekennzeichnet, dass:
    die oder jede Spitze (4) einen Flansch (5) aufweist, der sich in axialer Richtung auf der stromabwärts gelegenen Hochdruckseite des Lüfters erstreckt und der die Länge des Kriechströmungsweges erhöht, und wobei die Vorderkante (6) des Flansches (5) ein ungleichmäßiges Profil aufweist, sodass die umlaufende axiale Erstreckung der Vorderkante (6) des Flansches (5) entlang der Breite der Blattspitze variiert.
  2. Lüfter nach Anspruch 1, wobei die Vorderkante (6) des Flansches ein wellenförmiges Profil aufweist.
  3. Lüfter nach Anspruch 1 oder 2, wobei die Hinterkante der Lüfterspitze eine abgestufte Schulter (9) aufweist, die sich zumindest teilweise über die Breite der Blattspitze (3) erstreckt.
  4. Lüfter nach Anspruch 3, wobei die abgestufte Schulter (9) eine Vielzahl von abgestuften Ausnehmungen umfasst, die über die Breite der Blattspitze verteilt sind.
  5. Lüfter nach Anspruch 5, wobei die abgestuften Ausnehmungen (9) regelmäßig über die Breite der Blattspitze verteilt sind.
  6. Lüfter nach einem der vorhergehenden Ansprüche, wobei die äußere Spitzenfläche (8) ein ungleichmäßiges Profil in der umlaufenden Richtung aufweist.
  7. Lüfter nach einem der vorhergehenden Ansprüche, wobei die äußere Spitzenfläche (8) ein ungleichmäßiges Profil in der axialen Richtung aufweist.
  8. Lüfter nach Anspruch 6 oder 7, wobei das ungleichmäßige Profil von Wellen oder von Nuten (10) oder einer Mischung davon gebildet wird.
  9. Lüfter nach Anspruch 9, wobei die Wellen und/oder Nuten (10) sich teilweise oder vollständig entlang der axialen Erstreckung der äußeren Fläche erstrecken.
EP09701751.1A 2008-01-14 2009-01-13 Meridionaler lüfter Active EP2242932B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0800582A GB2452104B (en) 2008-01-14 2008-01-14 A meridional fan
PCT/GB2009/000088 WO2009090376A1 (en) 2008-01-14 2009-01-13 A meridional fan

Publications (2)

Publication Number Publication Date
EP2242932A1 EP2242932A1 (de) 2010-10-27
EP2242932B1 true EP2242932B1 (de) 2017-07-12

Family

ID=39144868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09701751.1A Active EP2242932B1 (de) 2008-01-14 2009-01-13 Meridionaler lüfter

Country Status (4)

Country Link
EP (1) EP2242932B1 (de)
ES (1) ES2636989T3 (de)
GB (1) GB2452104B (de)
WO (1) WO2009090376A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10422349B2 (en) 2014-07-08 2019-09-24 Daikin Industries, Ltd. Propeller fan and blower unit

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI443262B (zh) * 2010-12-29 2014-07-01 Delta Electronics Inc 風扇及其葉輪
EP2530330B1 (de) * 2011-06-01 2016-05-25 MTU Aero Engines AG Laufschaufel für einen Verdichter einer Turbomaschine, Verdichter sowie Turbomaschine
CN108087330A (zh) * 2017-11-27 2018-05-29 珠海格力电器股份有限公司 叶片结构及具有其的空调器
CN119146090A (zh) * 2024-10-29 2024-12-17 珠海格力电器股份有限公司 轴流风机叶片及具有其的轴流风机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030095864A1 (en) * 2001-11-19 2003-05-22 Borislav Ivanovic Fan with reduced noise

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5115210A (en) * 1974-07-02 1976-02-06 Rotoron Inc Zatsuongenshono fuan
DE3017226A1 (de) * 1979-05-12 1980-11-20 Papst Motoren Kg Ventilatorlaufrad
DE3234011A1 (de) * 1982-09-14 1984-03-15 Braun Ag, 6000 Frankfurt Axialluefter
JPS59185898A (ja) * 1983-04-08 1984-10-22 Aisin Seiki Co Ltd フアンブレ−ド
SU1339308A1 (ru) * 1986-04-14 1987-09-23 Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт По Оборудованию Для Кондиционирования Воздуха И Вентиляции Рабоча лопатка осевого вентил тора
JPH01106998A (ja) * 1987-10-20 1989-04-24 Seiko Electronic Components Ltd 軸流送風機のフアン形状
FR2753495B1 (fr) * 1996-09-19 1998-11-13 Valeo Thermique Moteur Sa Ventilateur, en particulier pour appareil de refroidissement et/ou chauffage et/ou climatisation de vehicule automobile
JPH10148199A (ja) * 1996-11-18 1998-06-02 Mitsubishi Heavy Ind Ltd 軸流ファン装置
DE10352253A1 (de) * 2003-11-08 2005-06-09 Alstom Technology Ltd Verdichterlaufschaufel
US20060034697A1 (en) * 2004-08-12 2006-02-16 Cheng-Kang Chen Propeller structure of a fan

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030095864A1 (en) * 2001-11-19 2003-05-22 Borislav Ivanovic Fan with reduced noise

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10422349B2 (en) 2014-07-08 2019-09-24 Daikin Industries, Ltd. Propeller fan and blower unit

Also Published As

Publication number Publication date
EP2242932A1 (de) 2010-10-27
GB0800582D0 (en) 2008-02-20
ES2636989T3 (es) 2017-10-10
GB2452104A (en) 2009-02-25
WO2009090376A1 (en) 2009-07-23
GB2452104B (en) 2009-07-22

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