EP0785362B1 - Cross flow fan impeller - Google Patents

Cross flow fan impeller Download PDF

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Publication number
EP0785362B1
EP0785362B1 EP96307582A EP96307582A EP0785362B1 EP 0785362 B1 EP0785362 B1 EP 0785362B1 EP 96307582 A EP96307582 A EP 96307582A EP 96307582 A EP96307582 A EP 96307582A EP 0785362 B1 EP0785362 B1 EP 0785362B1
Authority
EP
European Patent Office
Prior art keywords
flow fan
cross flow
blades
fan impeller
blade
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.)
Expired - Lifetime
Application number
EP96307582A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0785362A1 (en
Inventor
Yoshihashi Makoto
Ootsuta Katsuhisa
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0785362A1 publication Critical patent/EP0785362A1/en
Application granted granted Critical
Publication of EP0785362B1 publication Critical patent/EP0785362B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D29/66—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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
    • F04D17/04—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal of transverse-flow type
    • 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
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type

Definitions

  • the present invention relates to a cross flow fan, especially, to a cross flow fan impeller, where rotational noise of the impeller is reduced in a low frequency band of the noise.
  • a plurality of outlet nozzles 7 are provided in a lower front panel of a casing 6, a plurality of inlet ports 8 are provided in an upper front panel of the casing 6, and a heat exchanger 9 is provided behind the inlet ports 8 inside of the casing 6.
  • a cross flow fan impeller 4 is located between a back panel of the casing 6 and the heat exchanger 9 inside of the casing 6. Air is led through the inlet ports 8. The temperature of the air is changed by the heat exchanger 9 to cool or warm. The air is sent to the outlet nozzles 7 by rotation of the cross flow fan impeller 4 and the air is thus blown into the interior of a room through the outlet nozzles 7.
  • the cross flow fan impeller 4 includes a plurality of division plates 3, which are perpendicular to a rotational axis of the impeller, and a plurality of blades 1 as shown in Fig. 8.
  • the blades 1 are provided at periodic intervals between each pair of division plates 3.
  • the impeller 4 makes a noise, which corresponds to a number of blades.
  • the noise corresponding to the number of blades is called the noise "NZ", hereinafter.
  • the blades 1 are provided aperiodically, that is, provided at random intervals. This type of cross flow fan impeller is disclosed in Japanese Unexamined Patent Publication No. SHO 60-17296.
  • DE-A-2 322 734 discloses a cross flow fan with equally spaced blades which have a skew angle.
  • US-A-5 266 007 discloses a cross flow fan in accordance with the pre-characterising part of claim 1.
  • Fig. 9 shows a result of frequency analysis of rotational noise of a known cross flow fan impeller, where the blades are provided periodically.
  • Fig. 10 shows a result of frequency analysis of rotational noise of a known cross flow fan impeller where the blades are provided aperiodically, as disclosed in Japanese Unexamined Patent Publication No. SHO 60-17296.
  • the noise "NZ" can be reduced in the cross flow fan impeller where the blades are provided aperiodically, as disclosed in Japanese Unexamined Patent Publication No. SHO 60-17296.
  • another problem is raised that noise of low frequency, less than 600Hz, is generated as shown in Fig. 10.
  • Fig. 10 is a simulation result of frequency analysis of rotational noise of a cross flow fan impeller, where the blades are provided at random intervals based on the following equation.
  • ⁇ k ⁇ k 0 + d ⁇ ⁇ ( rnd( ⁇ ) - ⁇ /2) where,
  • Fig. 11 shows the locating angle ⁇ k which indicates the location of the k-th blade.
  • An object of the present invention is to provide an improved cross flow fan impeller, whereby the noise "NZ” can be reduced and the noise "N” in the low frequency band (lower than 600 Hz) can be also reduced.
  • a cross flow fan impeller includes a plurality of division plates being perpendicular to a rotational axis of the impeller and a plurality of blades provided between each pair of the plurality of division plates.
  • Fig. 1 shows a first embodiment of a cross flow fan impeller 4 according to the present invention.
  • a plurality of blades 1 including a reference blade 2 and a plurality of division plates 3 are provided in the impeller 4 of the first embodiment.
  • Each of the blades 1 is located with a locating angle ⁇ k away from the reference blade 2 based on the following equation.
  • ⁇ k ⁇ k 0 + ⁇ ⁇ d ⁇ ⁇ Sin( ⁇ ⁇ d ⁇ ⁇ k) where,
  • ⁇ k 0 2 ⁇ ⁇ k/35.
  • the blades 1 are respectively located in positions obtained by the above equation (2).
  • Fig. 12 explains the above equation (2).
  • ⁇ ⁇ d ⁇ ⁇ Sin( ⁇ ⁇ d ⁇ ⁇ k) shows displacement from ⁇ k 0, that is, the locating angle in the case of providing blades at equal intervals.
  • Fig. 2 shows an air conditioner including the cross flow fan impeller 4 of Embodiment 1 of the present invention.
  • a casing 6, an outlet 7, a plurality of inlet ports 8, a heat exchanger 9, and a stabilizer 10 are provided in an internal unit 5 of the air conditioner.
  • Fig. 3 is a sine curve showing the variation location of the blades 1 according to Embodiment 1 of the invention, the points A through D corresponding to the 0° , 90° , 180° , and 270° positions, as indicated in Fig. 1.
  • the location of the blades 1 is varied cyclically.
  • the noise "NZ” is modulated as shown in Fig. 4. A peak level of the noise “NZ” is dispersed and the noise level is thus decreased.
  • the noise level of the noise "N” generated by the impeller itself is decreased because there is still correlation among the blades.
  • ⁇ the cyclic coefficient
  • NZ the noise "NZ" is further modulated and it is effective to locate the plurality of blades cyclically.
  • ⁇ the cyclic coefficient
  • ⁇ the locating angle displacement coefficient
  • each location of the plurality of blades is determined by the equation (2) as in Embodiment 1, and the locating angle ⁇ k further includes a skew angle ⁇ ' as shown in Fig. 5. It is well-known that providing each blade with the skew angle ⁇ ' reduces the noise "NZ". To the configuration of Embodiment 1, the above feature is added, that is, each blade is provided with the skew angle ⁇ '. The noise "NZ" is reduced further more than the cross flow fan impeller only including the feature of Embodiment 1.
  • the cyclic coefficient ⁇ is a natural number greater than 2 in the cross flow fan impeller of Embodiment 5.
  • the noise "NZ" is further modulated and it is effective to locate the plurality of blades cyclically.
  • the cyclic coefficient ⁇ is a natural even number greater than 2 in the cross flow fan impeller of Embodiment 5.
  • the impeller is thus well-balanced mechanically.
  • the locating angle displacement coefficient ⁇ is a rational number and 0 ⁇ 1 in the cross flow fan impeller of Embodiment 5. Accordingly, the interval between each pair of adjacent blades does not become the same and none of the plurality of blades touches the next blade.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP96307582A 1996-01-18 1996-10-18 Cross flow fan impeller Expired - Lifetime EP0785362B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP644796 1996-01-18
JP00644796A JP3484854B2 (ja) 1996-01-18 1996-01-18 貫流送風羽根車
JP6447/96 1996-01-18

Publications (2)

Publication Number Publication Date
EP0785362A1 EP0785362A1 (en) 1997-07-23
EP0785362B1 true EP0785362B1 (en) 2002-12-11

Family

ID=11638682

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96307582A Expired - Lifetime EP0785362B1 (en) 1996-01-18 1996-10-18 Cross flow fan impeller

Country Status (8)

Country Link
EP (1) EP0785362B1 (ko)
JP (1) JP3484854B2 (ko)
KR (1) KR100216104B1 (ko)
CN (1) CN1076448C (ko)
AU (1) AU680173B1 (ko)
DE (1) DE69625322T2 (ko)
ES (1) ES2191080T3 (ko)
HK (1) HK1000496A1 (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9995316B2 (en) 2014-03-11 2018-06-12 Revcor, Inc. Blower assembly and method

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW377393B (en) * 1998-03-30 1999-12-21 Sanyo Electric Co Air coondition
KR100315518B1 (ko) * 1999-09-10 2001-11-30 윤종용 공기 조화기의 횡류 팬
JP4075264B2 (ja) * 2000-01-28 2008-04-16 セイコーエプソン株式会社 軸流ファン、遠心力ファン、およびこれらを用いた電子機器
WO2004029463A1 (ja) * 2002-09-24 2004-04-08 Toshiba Carrier Corporation 横流ファンおよびそれを備えた空気調和機
CN100501170C (zh) * 2006-09-11 2009-06-17 广东科龙电器股份有限公司 一种贯流风扇叶轮
US8881396B2 (en) 2011-02-07 2014-11-11 Revcor, Inc. Method of manufacturing a fan assembly
EP2696078B1 (de) * 2012-08-09 2019-10-02 MTU Aero Engines AG Beschaufelter Rotor für eine Turbomaschine und zugehöriges Montageverfahren
JP6601994B2 (ja) * 2013-09-06 2019-11-06 日立ジョンソンコントロールズ空調株式会社 空気調和機の室内機及びこれを用いた空気調和機
JP5804044B2 (ja) 2013-12-27 2015-11-04 ダイキン工業株式会社 多翼ファン
CN104132004B (zh) * 2014-08-04 2016-08-24 绿田机械股份有限公司 一种柴油机用的冷却风扇
CN104153905B (zh) * 2014-08-04 2016-08-17 绿田机械股份有限公司 一种风冷斜置式柴油机
CN105020176A (zh) * 2015-08-20 2015-11-04 珠海格力电器股份有限公司 风叶、离心通风机
CN106837859B (zh) * 2017-02-13 2019-11-29 美的集团股份有限公司 风机叶轮和离心风机
CN110206753B (zh) * 2018-06-29 2024-07-09 华帝股份有限公司 一种用于吸油烟机的离心风轮
CN108916078A (zh) * 2018-07-16 2018-11-30 大连碧蓝节能环保科技有限公司 螺旋叶片离心风机
US11274677B2 (en) 2018-10-25 2022-03-15 Revcor, Inc. Blower assembly

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2322734A1 (de) * 1973-05-05 1974-11-21 Buderus Eisenwerk Geblaese
JPS6017296A (ja) * 1983-07-08 1985-01-29 Matsushita Electric Ind Co Ltd 横断流送風機の羽根車
JP3349722B2 (ja) * 1992-08-25 2002-11-25 東芝キヤリア株式会社 空気調和機の室内ユニットおよびその梱包方法
US5266007A (en) * 1993-03-01 1993-11-30 Carrier Corporation Impeller for transverse fan
KR970009834B1 (ko) * 1994-02-08 1997-06-18 엘지전자 주식회사 횡류팬의 임펠러
DE4421604C1 (de) * 1994-06-21 1995-04-13 Siemens Ag Seitenkanalverdichter
JPH0890397A (ja) * 1994-09-21 1996-04-09 Kawasaki Steel Corp 鋼板の微小欠陥検出用砥石掛け構造

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9995316B2 (en) 2014-03-11 2018-06-12 Revcor, Inc. Blower assembly and method

Also Published As

Publication number Publication date
KR970059509A (ko) 1997-08-12
HK1000496A1 (en) 2003-04-25
KR100216104B1 (ko) 1999-08-16
JPH09195979A (ja) 1997-07-29
CN1164619A (zh) 1997-11-12
ES2191080T3 (es) 2003-09-01
EP0785362A1 (en) 1997-07-23
JP3484854B2 (ja) 2004-01-06
DE69625322T2 (de) 2003-10-16
DE69625322D1 (de) 2003-01-23
CN1076448C (zh) 2001-12-19
AU680173B1 (en) 1997-07-17

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