GB2466125A - A Fan Blade with Holes - Google Patents

A Fan Blade with Holes Download PDF

Info

Publication number
GB2466125A
GB2466125A GB0921650A GB0921650A GB2466125A GB 2466125 A GB2466125 A GB 2466125A GB 0921650 A GB0921650 A GB 0921650A GB 0921650 A GB0921650 A GB 0921650A GB 2466125 A GB2466125 A GB 2466125A
Authority
GB
United Kingdom
Prior art keywords
blade
edge portion
holes
pressure balance
back 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Withdrawn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
GB0921650A
Other versions
GB0921650D0 (en
Inventor
Da Zhang
Yuqi Chen
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.)
Zhongshan Broad Ocean Motor Co Ltd
Original Assignee
Zhongshan Broad Ocean Motor Co Ltd
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 CNA2008101870340A external-priority patent/CN101440822A/en
Application filed by Zhongshan Broad Ocean Motor Co Ltd filed Critical Zhongshan Broad Ocean Motor Co Ltd
Publication of GB0921650D0 publication Critical patent/GB0921650D0/en
Publication of GB2466125A publication Critical patent/GB2466125A/en
Withdrawn legal-status Critical Current

Links

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
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • 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
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/388—Blades characterised by construction
    • 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
    • F04D29/682—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps by fluid extraction
    • 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
    • F04D29/684—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps by fluid injection
    • 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
    • F05D2240/304—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 trailing edge of a rotor blade

Landscapes

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

Abstract

A blade for an axial fan (fig.3) or a centrifugal fan (fig.4), the blade includes: a front edge portion 1, a back edge portion 2, and multiple pressure balance holes 3; the front edge portion operates to blow air from the outside of the blade, the back edge portion operates to blow air to the outside of the blade, and the pressure balance hole is disposed on the back edge portion. The pressure balance holes are adapted to balance pressure and reduce pressure difference between the front side and the back side of the blade, eliminating backflow phenomenon caused by separation of boundary layer airflow at the back edge portion on a windward side 4 of the blade and thus reducing power consumption and noise, and preventing dust from settling on the back edge portion on the windward side of the blade. Preferably the holes are formed in an array and the hole can be of an shape even forming a net structure.

Description

FAN BLADES
[0001] FIELD OF THE NVENTION
The invention relates to a blade for an axial fan and a blade for a centrifugal fan.
BACKGROUND OF THE DWENTION
[0002] As shown in FIG. 1, a conventional blade for an axial fan comprises a front edge portion and a back edge portion. The front edge portion operates to blow air from the outside of the blade, and the back edge portion operates to blow air to the outside of the blade. However, there are several problems with the blade: as the blade rotates, the airflow at the back edge portion is affected with increase of rotary kinetic energy, as a result, separation of boundary layer airflow causes a backflow phenomena when the airflow is discharged from the back edge portion, which increases power consumption and noise, and a great deal of dust is settled on the back edge portion on a windward side of the blade.
[0003] As for a conventional blade for a centrifugal fan, the same problems as above exist.
SUMMARY OF THE INVENTION
[0004] In view of the above-described problem, it is one objective of the invention to provide a conventional blade for an axial fan that is capable of eliminating a backflow phenomena caused by separation of boundary layer airflow, reducing power consumption and noise, and preventing dust from being settled on a back edge portion on a windward side of the blade.
[0005] It is another objective of the invention to provide a conventional blade for a centrifugal fan that is capable of eliminating a backflow phenomena caused by separation of boundary layer airflow, reducing power consumption and noise, and preventing dust from being settled on a back edge portion on a windward side of the blade.
[0006] To achieve the above objectives, in accordance with one embodiment of the invention, provided is a blade for an axial fan, comprising a front edge portion, a back edge portion, and multiple pressure balance holes. The front edge portion operates to blow air from the outside of the blade, the back edge portion operates to blow air to the outside of the blade, and the pressure balance hole is disposed on the back edge portion.
[0007] In a class of this embodiment, the pressure balance holes are distributed in an array, uniformly or randomly.
[0008] In a class of this embodiment, the pressure balance holes are straight through holes or inclined through holes.
[0009] In a class of this embodiment, the pressure balance holes form a hole net whereby adjusting pressure on both side of the blade.
[0010] In a class of this embodiment, a diameter of the pressure balance hole ranges from 0.1 mmto 100 mm.
[0011] In a class of this embodiment, the pressure balance hole is a circular hole or a non-circular hole.
[0012] In accordance with another embodiment of the invention, provided is a blade for a centrifugal fan, comprising a front edge portion, a back edge portion, and multiple pressure balance holes. The front edge portion operates to blow air from the outside of the blade, the back edge portion operates to blow air to the outside of the blade, and the pressure balance hole is disposed on the back edge portion.
[0013] In a class of this embodiment, the pressure balance holes are distributed in an array, uniformly or randomly.
[0014] In a class of this embodiment, the pressure balance holes are straight through holes or inclined through holes.
[0015] In a class of this embodiment, the pressure balance holes form a hole net whereby adjusting pressure on both side of the blade.
[0016] In a class of this embodiment, a diameter of the pressure balance hole ranges from 0.1 mmto 100 mm.
[0017] In a class of this embodiment, the pressure balance hole is a circular hole or a non-circular hole.
[0018] Advantages of the blade for an axial fan of the invention comprise: 1) the pressure balance holes disposed on the back edge portion are capable of balancing pressure and reducing pressure difference between a front side and a back side of the blade; 2) the pressure balance holes are capable of eliminating a backflow phenomena caused by separation of boundary layer airflow at the back edge portion on a windward side of the blade and thus reducing power consumption and noise; 3) the pressure balance holes are capable of preventing dust from being settled on a back edge portion on a windward side of the blade.
[0019] Advantages of the blade for a centrifugal fan of the invention comprise: 1) the pressure balance holes disposed on the back edge portion are capable of balancing pressure and reducing pressure difference between a front side and a back side of the blade; 2) the pressure balance holes are capable of eliminating a backflow phenomena caused by separation of boundary layer airflow at the back edge portion on a windward side of the blade and thus reducing power consumption and noise; 3) the pressure balance holes are capable of preventing dust from being settled on a back edge portion on a windward side of the blade.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The invention is described hereinafter with reference to accompanying drawings, in which: [0021] FIG. 1 is a schematic view of an axial fan in the prior art; [0022] FIG. 2 is a schematic view of a blade for an axial fan of an exemplary embodiment of the invention; [0023] FIG. 3 illustrates an application of an axial fan of an exemplary embodiment of the invention; [0024] FIG. 4 is a schematic view of a centrifugal fan of another exemplary embodiment of the invention; and [0025] FIG. 5 is a schematic view of a blade for a centrifugal fan of another exemplary embodiment of the invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0026] As shown in FIGS. 2 and 3, a blade for an axial fan of the invention comprises a front edge portion 1, a back edge portion 2, and multiple pressure balance holes 3. The front edge portion 1 operates to blow air from the outside of the blade, the back edge portion 2 operates to blow air to the outside of the blade, and the pressure balance hole 3 is disposed on the back edge portion 2.
[0027] The pressure balance holes 3 are distributed in an affay, uniformly or randomly.
[0028] In this embodiment, the pressure balance holes 3 are circular holes, non-circular holes, straight through holes or inclined through holes, and a diameter of each of the pressure balance holes 3 ranges from 0.1 mm to 100 mm.
[0029] The pressure balance holes 3 form a hole net whereby adjusting pressure on both side of the blade.
[0030] The pressure balance holes 3 are capable of balancing pressure and reducing pressure difference between a front side and a back side of the blade, eliminating a backflow phenomena caused by separation of boundary layer airflow at the back edge portion 2 on a windward side 4 of the blade and thus reducing power consumption and noise, and preventing dust from being settled on the back edge portion 2 on the windward side 4 of the blade.
[0031] As shown in FIGS. 4 and 5, a blade for a centrifugal fan of the invention comprises a front edge portion 1, a back edge portion 2, and multiple pressure balance holes 3. The front edge portion 1 operates to blow air from the outside of the blade, the back edge portion 2 operates to blow air to the outside of the blade, and the pressure balance hole 3 is disposed on the back edge portion 2.
[0032] The pressure balance holes 3 are distributed in an affay, uniformly or randomly.
[0033] In this embodiment, the pressure balance holes 3 are circular holes, non-circular holes, straight through holes or inclined through holes, and a diameter of each of the pressure balance holes 3 ranges from 0.1 mm to 100 mm.
[0034] The pressure balance holes 3 form a hole net whereby adjusting pressure on both side of the blade.
[0035] The pressure balance holes 3 are capable of balancing pressure and reducing pressure difference between a front side and a back side of the blade, eliminating a backflow phenomena caused by separation of boundary layer airflow at the back edge portion 2 on a windward side 4 of the blade and thus reducing power consumption and noise, and preventing dust from being settled on the back edge portion 2 on the windward side 4 of the blade.
[0036] While particular embodiments of the invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects, and therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention.

Claims (10)

  1. FAN BLADESClaims: 1. A blade for an axial fan, comprising a front edge portion(1); a back edge portion(2); and multiple pressure balance holes (3); wherein said front edge portion (1) operates to blow air from the outside of the blade; said back edge portion (2) operates to blow air to the outside of the blade; and said pressure balance hole (3) is disposed on said back edge portion.
  2. 2. The blade of claim 1, wherein said pressure balance holes (3) are distributed in an anay, uniformly or randomly.
  3. 3. The blade of claim 1 or claim 2, wherein said pressure balance holes (3) are circular holes, non-circular holes, straight through holes or inclined through holes.
  4. 4. The blade of claim 3, wherein said pressure balance holes (3) form a hole net whereby adjusting pressure on both side of the blade.
  5. 5. The blade of claim 3, wherein a diameter of said pressure balance hole (3) ranges from 0.1 mm to 100 mm, wherein said pressure balance hole (3) is a circular hole or a non-circular hole.
  6. 6. A blade for a centrifugal fan, comprising a front edge portion (1); a back edge portion (2); and multiple pressure balance holes (3); wherein said front edge portion (1) operates to blow air from the outside of the blade; said back edge portion (2) operates to blow air to the outside of the blade; and said pressure balance hole (3) is disposed on said back edge portion.
  7. 7. The blade of claim 6, wherein said pressure balance holes (3) are distributed in an affay, uniformly or randomly.
  8. 8. The blade of claim 6 or claim 7, wherein said pressure balance holes (3) are circular holes, non-circular holes, straight through holes or inclined through holes.
  9. 9. The blade of claim 8, wherein said pressure balance holes (3) form a hole net whereby adjusting pressure on both side of the blade.
  10. 10. The blade of claim 8, wherein a diameter of said pressure balance hole (3) ranges from 0.1 mm to 100 mm, wherein said pressure balance hole (3) is a circular hole or a non-circular hole.
GB0921650A 2008-12-11 2009-12-11 A Fan Blade with Holes Withdrawn GB2466125A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2008101870340A CN101440822A (en) 2008-11-28 2008-12-11 Axial-flow fan and fan blade of centrifugal fan

Publications (2)

Publication Number Publication Date
GB0921650D0 GB0921650D0 (en) 2010-01-27
GB2466125A true GB2466125A (en) 2010-06-16

Family

ID=41667265

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0921650A Withdrawn GB2466125A (en) 2008-12-11 2009-12-11 A Fan Blade with Holes

Country Status (5)

Country Link
CA (1) CA2687806A1 (en)
DE (1) DE102009044824A1 (en)
FR (1) FR2939851A1 (en)
GB (1) GB2466125A (en)
WO (1) WO2010066140A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2507307A (en) * 2012-10-25 2014-04-30 Anglia Ruskin University Impeller

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2983193B1 (en) 2011-11-30 2014-05-09 Snecma Propulsion Solide PROCESS FOR MANUFACTURING A PIECE OF MATERIAL CMC
CN106593950B (en) * 2017-01-20 2023-01-03 美的集团股份有限公司 Blade, centrifugal fan impeller, centrifugal fan and range hood
CN106930977A (en) * 2017-03-17 2017-07-07 中国大唐集团科技工程有限公司 A kind of direct-cooled noise reduction axial flow blower
KR20220146705A (en) 2020-03-10 2022-11-01 에베엠-펩스트 물핑겐 게엠베하 운트 코. 카게 Fan and fan blades
DE102022113142A1 (en) 2022-05-24 2023-11-30 Ebm-Papst Mulfingen Gmbh & Co. Kg Diverting device and fan with diverting device
EP4283135A1 (en) 2022-05-24 2023-11-29 ebm-papst Mulfingen GmbH & Co. KG Outlet flow guide device and fan with outlet flow guide device
DE102022113141A1 (en) 2022-05-24 2023-11-30 Ebm-Papst Mulfingen Gmbh & Co. Kg Diverting device and fan with diverting device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2128787C1 (en) * 1993-11-19 1999-04-10 Вейнберг Вениамин Яковлевич Fan device
US20040187691A1 (en) * 2002-08-30 2004-09-30 Tai-Ching Lee Fan blade
US6994522B1 (en) * 2002-07-17 2006-02-07 Chang Chin-Chih Fan blade
US20060201721A1 (en) * 2005-03-09 2006-09-14 New Scientific R&D Institute Inc. Rotary propeller
CN201037475Y (en) * 2007-05-08 2008-03-19 金家宝工业有限公司 Fan blade structure
CN201043531Y (en) * 2007-04-27 2008-04-02 上海水产大学 Novel fan for freezing device
CN201236843Y (en) * 2008-04-28 2009-05-13 上海陈立实业有限公司 Face structure of axial fan blade

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DE4214753A1 (en) * 1992-05-04 1993-11-11 Asea Brown Boveri Radial compressor impeller with axially spaced shroud disc - has series of holes across blade ends to give stable flow under part load conditions
JPH1037895A (en) * 1996-07-25 1998-02-13 Hitachi Ltd Air-conditioning fan
JPH1061594A (en) * 1996-08-14 1998-03-03 Nishiei Tekkosho:Kk Structure of impeller and pump
JPH11280696A (en) * 1998-03-27 1999-10-15 Sanyo Electric Co Ltd Propeller fan
FR2851857B1 (en) * 2003-02-27 2014-05-23 Valeo Equip Electr Moteur IMPROVED VENTILATION DEVICE FOR ROTATING ELECTRICAL MACHINE
JP2007303714A (en) * 2006-05-10 2007-11-22 Matsushita Electric Ind Co Ltd Air blower for air conditioner
CN101440822A (en) * 2008-11-28 2009-05-27 中山大洋电机股份有限公司 Axial-flow fan and fan blade of centrifugal fan

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2128787C1 (en) * 1993-11-19 1999-04-10 Вейнберг Вениамин Яковлевич Fan device
US6994522B1 (en) * 2002-07-17 2006-02-07 Chang Chin-Chih Fan blade
US20040187691A1 (en) * 2002-08-30 2004-09-30 Tai-Ching Lee Fan blade
US20060201721A1 (en) * 2005-03-09 2006-09-14 New Scientific R&D Institute Inc. Rotary propeller
CN201043531Y (en) * 2007-04-27 2008-04-02 上海水产大学 Novel fan for freezing device
CN201037475Y (en) * 2007-05-08 2008-03-19 金家宝工业有限公司 Fan blade structure
CN201236843Y (en) * 2008-04-28 2009-05-13 上海陈立实业有限公司 Face structure of axial fan blade

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2507307A (en) * 2012-10-25 2014-04-30 Anglia Ruskin University Impeller
GB2507307B (en) * 2012-10-25 2020-04-29 Anglia Ruskin Univ Impeller

Also Published As

Publication number Publication date
FR2939851A1 (en) 2010-06-18
DE102009044824A1 (en) 2010-06-17
GB0921650D0 (en) 2010-01-27
WO2010066140A1 (en) 2010-06-17
CA2687806A1 (en) 2010-06-11

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