EP2607714B1 - Propeller Fan and Heat Source Unit including same - Google Patents

Propeller Fan and Heat Source Unit including same Download PDF

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Publication number
EP2607714B1
EP2607714B1 EP12198822.4A EP12198822A EP2607714B1 EP 2607714 B1 EP2607714 B1 EP 2607714B1 EP 12198822 A EP12198822 A EP 12198822A EP 2607714 B1 EP2607714 B1 EP 2607714B1
Authority
EP
European Patent Office
Prior art keywords
blades
propeller fan
fan
recess portions
lengths
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
EP12198822.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2607714A2 (en
EP2607714A3 (en
Inventor
Yoshiki Tabata
Mitsuyoshi Ishijima
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.)
Toshiba Carrier Corp
Original Assignee
Toshiba Carrier 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 Toshiba Carrier Corp filed Critical Toshiba Carrier Corp
Publication of EP2607714A2 publication Critical patent/EP2607714A2/en
Publication of EP2607714A3 publication Critical patent/EP2607714A3/en
Application granted granted Critical
Publication of EP2607714B1 publication Critical patent/EP2607714B1/en
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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
    • F04D29/26—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
    • F04D29/327—Rotors specially for elastic fluids for axial flow pumps for axial flow fans with non identical 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
    • F04D29/66—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
    • 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

Definitions

  • the present invention relates to a propeller fan and a heat source unit provided with the propeller fan.
  • a propeller fan has been used as a fan of a variety of heat source units such as an outdoor unit of an air conditioner, a heat source machine for a water heater with a heat pump, and an outdoor unit of a refrigerating (freezing) machine.
  • a known example of such a conventional propeller fan is described in Patent Document 1 (Japanese Patent Laid-Open No. 2005-140081 ). Further examples are given in Patent Document 2 (Japanese Patent Laid-Open No. 2002-054596 ), Patent Document 3 (Japanese Patent Laid-Open No. 2003- 343489 ), and Patent Document 4 ( US 4,089,618 ).
  • the conventional propeller is formed with substantially circular-arc shaped recesses at a blade rear edge portion as air blow-out portion during the rotation of the fan, and the circular-arc shaped recesses are recessed in direction opposite to the direction of air flowing from the blade front edge to the blade rear edge, thereby suppressing the generation of the trailing vortices from the blades to reduce noise which will be generated at the time of blowing air.
  • Such a conventional propeller fan however, has arc-shaped recess portions which have the same shape and size in a plurality of blades, and accordingly, peak frequencies of blade pitch sound generated by trailing vortices of the respective blades are in consonance with each other, which unfortunately does not effectively reduce the blowing air noise, thus being inconvenient.
  • the present invention was conceived in consideration of the above conventional circumstances, and an object thereof is to provide a propeller fan capable of improving the reduction in blowing (or blown) air noise and also provide a heat source unit including such propeller fan.
  • a propeller fan having a plurality of blades fixed to a hub on a rotation axis of the fan, wherein each of the blades has a recess portion formed in a blade rear edge section as air blow-out portion during rotation of the fan, the recess portions of the respective blades being recessed in a direction opposite to the direction of air flow along the blade from the front edge to the rear edge and being different in size.
  • the recess portions of the blades are formed such that perpendicular lines drawn from line segments joining inner endpoints and outer endpoints of the blade rear edge sections to deepest points of the recess portions are different from each other in lengths thereof.
  • the recess portions are formed such that a length of the line segments "a" and lengths of the perpendicular lines "b" of the blades satisfy relationship of "0.1a ⁇ b ⁇ 0.5a” and the lengths "b" in the blades are different from each other.
  • a number of the blades is three, and the lengths of the perpendicular lines b1, b2 and b3 of the blades are determined so as to satisfy: "b1 ⁇ b2 ⁇ b3", “0.1a ⁇ b1 ⁇ 0.35a”, “0.15a ⁇ b2 ⁇ 0.4a”, and "0.2a ⁇ b3 ⁇ 0.5a.”
  • a heat source unit comprising: a unit housing; a propeller fan of the structures mentioned above and housed in the unit housing; an outdoor heat exchanger housed in the unit housing through which the propeller fan blows air; and a fan motor mounted to the unit housing for driving the propeller fan.
  • the heat source unit as outdoor unit of an air conditioner for example, provided with the above propeller fan can attain the same or like effects as mentioned above.
  • Fig. 1 is a front view illustrating a propeller fan according to a first embodiment
  • Fig. 2 is a perspective view thereof.
  • a propeller fan 1 is entirely made of plastic compounded of glass fiber and ASG (Acrylonitrile Styrene Glass) resin, for example, and three blades 4, 5 and 6 having similar shapes are circumferentially installed at substantially regular intervals to a hub 3 on a fan rotation shaft 2 (i.e., rotation axis of a fan motor, not shown), as illustrated in Figs. 1 and 2 .
  • Each of the blades 4, 5 and 6 has substantially arc-shaped (arcuate) blade rear edge recess portions 4b, 5b and 6b, respectively, in blade rear edge sections 4a, 5a and 6a (the term "rear edge” is used herein in the fan rotating direction as shown with a black arrow in Fig. 1 ).
  • the portions 4b, 5b and 6b are recessed in direction opposite to air flow denoted by a white arrow in Fig. 1 .
  • the arcuate recess portions 4b, 5b and 6b formed to the respective blades are different from each other in size. Specifically, if perpendicular lines b1, b2 and b3 are drawn from line segments "a" joining inner endpoints P and outer endpoints Q to deepest points 4R, 5R and 6R of the respective recess portions 4b, 5b and 6b, the lengths of these perpendicular lines b1, b2 and b3 (depths of the recess portions 4b to 6b) are not smaller than 0.1a and not greater than 0.5a (0.1a ⁇ b1, b2, b3 ⁇ 0.5a), and "b1 ⁇ b2 ⁇ b3".
  • the recess portions 4b, 5b and 6b are formed so that the lengths of the perpendiculars b1, b2 and b3 and the length of line segments "a" satisfy the following relationship: "0.1a ⁇ b1 ⁇ 0.35a”, “0.15a ⁇ b2 ⁇ 0.4a”, and "0.2a ⁇ b3 ⁇ 0.5a". Further, the line segments "a" in the blades 4, 5 and 6 have the same length.
  • the peak frequencies and phases of blade sound generated by trailing vortices from the blades 4, 5 and 6 during the rotation of the fan can be shifted to suppress consonance, and thereby the reduction in blowing (blown) air noise can be improved.
  • Fig. 4 shows experimental data on air blowing performance of the propeller fan 1 illustrated in Fig. 1 .
  • test models #1 to #6 were prepared, which test models each include its own propeller fan 1 of a required size, such as a diameter of 420 mm.
  • test models #1 to #6 were then operated at 800 rpm with an amount of air being 2080 m 3 /h, and a blown air noise value (dB(A)) was measured at a position being 1 m (1 meter) apart from each fan in the air blowing direction.
  • a three-bladed propeller fan that is a conventional model, was also prepared.
  • the three recess portions 4b to 6b of the fan were the same in depth (b1, b2, b3 : 0.2a), shape, and size.
  • the model was operated under the same condition as that of the first embodiment and a blown air noise value (dB(A)) and the like were also shown in Fig. 4 as conventional fan in the table.
  • Fig. 5 shows the values of air noise blown from the propeller fan 1 of the present embodiment and the conventional model shown in Fig. 4
  • a curve Na represents the one of the present embodiment
  • a substantially straight line Nb represents the conventional model fan.
  • Fig. 5 also shows relationship between dimension ratios of the perpendiculars b1, b2, and b3 (b1 : b2 : b3) denoting the depths of the recess portions 4b, 5b, and 6b, respectively, and the noise values dB(A) during the rotation of the fans.
  • a smallest value of blown air noise, 46 dB was given when a dimension ratio of the perpendiculars b1, b2, and b3 was "0.2a : 0.23a : 0.26a.”
  • the test model #3 whose b1 was 0.2a, b2 was 0.23a, and b3 was 0.26a, resulted in the smallest value of blown air noise.
  • the conventional model fan resulted in a constant noise value of about 47.2 dB(A).
  • the blown air noise does not become greater than about 46.9 dB(A), and hence, the noise is smaller than the noise value Nb, about 47.2 dB(A), of the conventional model denoted by the substantially straight line shown in Fig. 5 .
  • an input power of the motor is also smaller than that of the conventional model as illustrated in Fig. 4 , thereby also improving the motor efficiency. Accordingly, it is considered to be preferable that the range of the perpendicular lines is set as mentioned above.
  • Fig. 6 is a schematic cross-sectional view illustrating an outdoor unit 11 of an air conditioner as a heat source unit according to the present second embodiment provided with the propeller fan of the structure mentioned above.
  • the outdoor unit 11 of the air conditioner has an outdoor heat exchanger 13 having a planar L-shape, the propeller fan 1 according to the first embodiment, a compressor 14, a four-way valve 15 and a controller 16 such as an inverter in a unit housing 12.
  • reference numeral 17 denotes a partition plate separating a space inside the outdoor unit 1 into a space for the propeller fan 1 and the outdoor heat exchanger 13, and a space for the compressor 14.
  • Reference numeral 18 denotes a support member supporting a fan motor 19 that drives the propeller fan 1.
  • the outdoor unit 11 includes the propeller fan 1, which can improve the reduction in noise of the blown air as described with reference to the above first embodiment, the outdoor unit 11 can achieve the improved reduction in the blown air noise.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
EP12198822.4A 2011-12-21 2012-12-21 Propeller Fan and Heat Source Unit including same Active EP2607714B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011280216A JP2013130125A (ja) 2011-12-21 2011-12-21 プロペラファンおよびこれを用いた熱源ユニット

Publications (3)

Publication Number Publication Date
EP2607714A2 EP2607714A2 (en) 2013-06-26
EP2607714A3 EP2607714A3 (en) 2014-08-13
EP2607714B1 true EP2607714B1 (en) 2020-07-08

Family

ID=47520782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12198822.4A Active EP2607714B1 (en) 2011-12-21 2012-12-21 Propeller Fan and Heat Source Unit including same

Country Status (4)

Country Link
EP (1) EP2607714B1 (ja)
JP (1) JP2013130125A (ja)
CN (1) CN203098387U (ja)
DK (1) DK2607714T3 (ja)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2711558B1 (en) * 2012-09-24 2020-07-08 Samsung Electronics Co., Ltd. Propeller fan
JP5980180B2 (ja) 2013-08-08 2016-08-31 三菱電機株式会社 軸流ファン、及び、その軸流ファンを有する空気調和機
KR102479815B1 (ko) * 2015-11-30 2022-12-23 삼성전자주식회사 송풍팬 및 이를 구비하는 공기 조화기
CN106766045B (zh) * 2016-11-15 2019-12-10 广东美的制冷设备有限公司 送风组件和空调器
CN106766046A (zh) * 2016-11-15 2017-05-31 广东美的制冷设备有限公司 送风组件和空调器
WO2018216164A1 (ja) * 2017-05-25 2018-11-29 三菱電機株式会社 プロペラファン及び冷凍サイクル装置
CN107023513A (zh) * 2017-06-16 2017-08-08 广东美的制冷设备有限公司 轴流风轮及空调器
CN107178512A (zh) * 2017-07-27 2017-09-19 张兴军 螺旋桨式风扇及成型用模具
TWI658214B (zh) 2017-08-25 2019-05-01 宏碁股份有限公司 散熱扇葉與散熱風扇
CN109578331B (zh) * 2017-09-29 2021-10-22 宏碁股份有限公司 散热扇叶与散热风扇
CN109028350B (zh) * 2018-07-25 2021-03-12 深圳市中航楼宇科技有限公司 一种环保型空调制冷用室外气流排放装置及排放方法

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JPS5115210A (en) * 1974-07-02 1976-02-06 Rotoron Inc Zatsuongenshono fuan
JP2002054596A (ja) * 2000-08-10 2002-02-20 Japan Servo Co Ltd 軸流フアン
JP2003065295A (ja) * 2001-08-29 2003-03-05 Toshiba Kyaria Kk 軸流送風機
JP4003541B2 (ja) * 2002-05-30 2007-11-07 三菱電機株式会社 送風機
JP4467952B2 (ja) * 2003-11-10 2010-05-26 東芝キヤリア株式会社 プロペラファン、これを用いた空気調和機用室外ユニット
DE102009028125A1 (de) * 2009-07-30 2011-02-03 Robert Bosch Gmbh Eintrittsgeometrie für halbaxiale Lüfterräder

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
DK2607714T3 (da) 2020-08-10
EP2607714A2 (en) 2013-06-26
CN203098387U (zh) 2013-07-31
JP2013130125A (ja) 2013-07-04
EP2607714A3 (en) 2014-08-13

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