EP2131041B1 - Sirocco fan and air conditioner - Google Patents

Sirocco fan and air conditioner Download PDF

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Publication number
EP2131041B1
EP2131041B1 EP08722746.8A EP08722746A EP2131041B1 EP 2131041 B1 EP2131041 B1 EP 2131041B1 EP 08722746 A EP08722746 A EP 08722746A EP 2131041 B1 EP2131041 B1 EP 2131041B1
Authority
EP
European Patent Office
Prior art keywords
sirocco fan
blade
air
fan
revolutions
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
EP08722746.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2131041A4 (en
EP2131041A1 (en
Inventor
Hiroki Okazawa
Ryouji Abe
Hiroshi Tsutsumi
Takahiro Yamatani
Kazunobu Nishimiya
Yukihiko Kawanori
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
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Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP2131041A1 publication Critical patent/EP2131041A1/en
Publication of EP2131041A4 publication Critical patent/EP2131041A4/en
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Publication of EP2131041B1 publication Critical patent/EP2131041B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/007—Ventilation with forced flow
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F24F1/0022—Centrifugal or radial fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
    • F24F1/0047—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
    • F24F1/0057—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in or on a wall
    • 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
    • F05D2250/00—Geometry
    • F05D2250/70—Shape

Definitions

  • the present invention relates to a sirocco fan, more particularly a sirocco fan in which a noise is reduced and an air-blowing characteristic is improved, and to an air-conditioning apparatus provided with the same.
  • sirocco fans are often used.
  • the sirocco fan is composed of a whorl-shaped scroll and a large number of proclinated blades rotatably disposed in the scroll and arranged in a cylindrical manner.
  • the air-conditioning apparatus provided with such a sirocco fan, for example, the sirocco fan of a window-type air conditioner that is disclosed in a patent document 1 exists.
  • the blade is formed to have a blade exit angle of from 125 to 137 degrees, a blade inlet angle of from 58 to 63 degrees, a solidity of from 0.75 to 0.85, an inner/outer diameter ratio of from 0.82 to 0.86, and a maximum warp position of from 0.3 to 0.4, the maximum warp position being defined as a ratio of the most warped position to a blade length in Reference Document 1.
  • the blade By forming the blade to have a configuration as described above, it is specified that a noise of the sirocco fan is not increased even when a rotation speed is increased with an air-blowing amount being preserved.
  • Patent Document 1 Japanese Unexamined Patent Application Publication No. 2001-323895 (Claim 1, Fig. 1 through Fig. 3 )
  • EP 1 632 725 A1 discloses an air conditioner.
  • an object of the present invention is to provide a sirocco fan capable of obtaining a large air-blowing amount at a time of a predetermined noise occurrence, in other words, capable of reducing a noise value and a number of revolutions when obtaining a predetermined air-blowing amount, and an air-conditioning apparatus provided with the same.
  • a blade shape of a sirocco fan when a fan diameter is defined as D, a maximum camber height is defined as H, a blade chord length is defined as L, a radius of a front edge of an inner circumferential side of the blade is defined as R, a blade inlet angle is defined as ⁇ 1 , and a blade exit angle is defined as ⁇ 2 , by making 0.18 ⁇ H/L ⁇ 0.26, R/L ⁇ 0.11, 100° ⁇ ⁇ 1 ⁇ 130°, and 26° ⁇ ⁇ 2 ⁇ 32°, an air-blowing amount at the time of a predetermined noise occurrence can be increased and in the case of an air-conditioning apparatus, the COP can be improved.
  • 1 sirocco fan 2 fan motor, 3 heat exchanger, 4 suction inlet, 5 blowing-out exit, 6 scroll, 7 rotation shaft, 8 blade, 9 warped line, 9a inner circumferential end, 9b outer circumferential end, 10 indoor unit, 11 straight line (blade chord length L), 12 perpendicular line, 13 inner circumferential tangent, 14 warped line tangent, 15 outer circumferential tangent, 16 warped line tangent, 100 conventional sirocco fan, D fan-diameter, H maximum camber height, L blade chord length, R radius of a front edge, ⁇ incidence angle, ⁇ 1 blade inlet angle, ⁇ 2 blade exit angle.
  • Fig. 1 is a schematic plan view (a) and a schematic side elevation (b) illustrating an inner constitution of an indoor unit of an air-conditioning apparatus provided with a sirocco fan of a first embodiment of the present invention.
  • the indoor unit 10 constitutes an indoor air-conditioning apparatus, and is provided with a pair of sirocco fans 1, a fan motor 2 that simultaneously rotationally drives these sirocco fans 1, and a heat exchanger 3 that performs heat-exchanging operation with air that is blown out from the sirocco fans 1.
  • the sirocco fan 1 is provided with a whorl-shaped scroll 6, and a large number of blades that are rotatably disposed in the scroll 6 and arranged in a cylindrical manner.
  • a reference numeral 4 denotes a suction inlet of the air
  • a reference numeral 5 denotes a blowing outlet for cold air or warm air
  • a reference numeral 7 denotes a rotation shaft of the fan motor 2.
  • the aforementioned indoor unit 10 is provided with a refrigerating circuit for a refrigerant, which is constituted by a compressor, a condenser, an expansion valve, and an evaporator, all of which being not shown, and is configured so as to perform cooling heating operations in a room, or the like.
  • a refrigerating circuit for a refrigerant which is constituted by a compressor, a condenser, an expansion valve, and an evaporator, all of which being not shown, and is configured so as to perform cooling heating operations in a room, or the like.
  • the sirocco fan 1 is configured to have a fan-diameter D of 160 mm, a width of 190 mm, the number of the blades of 40, and the heat exchanger 3 is provided with a heat transmission pipe of 12 steps, and an array pitch thereof is 12.7 mm and a step pitch thereof is 20.4 mm, a length in an axial direction of the heat transmission pipe is 700 mm, and a draft resistance ⁇ P1 is 23.1 V 1.3 [Pa] (V: velocity[m/s]).
  • the indoor unit 10 is configured to have a depth of 680 mm, a height of 210 mm, and a width of 960 mm.
  • the air in the room is sucked in from the suction inlet 4 of the indoor unit 10, and is further sucked in from a suction inlet of the scroll 6 in an axial direction.
  • the air to which a dynamic pressure and a static pressure is applied by a cylindrical blade array that is rotating in the scroll 6 by means of the fan motor 2 is blown out from a blowing outlet that opens to an air trunk in the indoor unit 10 to be heat-exchanged with the heat exchanger 3 installed in the air trunk, then blown out from the blowing outlet 5 into the room while being turned into cool or warm air.
  • Fig. 2 is an explanatory view of parameters indicating a blade shape of the sirocco fan.
  • Fig. 3 is a view illustrating a blade shape of the sirocco fan in the first embodiment.
  • Fig. 4 is a comparative view illustrating a conventional blade shape by superimposing Fig. 3 .
  • An air-blowing amount of the sirocco fan 1 at a predetermined noise value is decided by relations of parameters D, L, H, ⁇ 1 , ⁇ 1 , and R of the sirocco fan 1, where a fan-diameter is defined as D, a blade chord length is defined as L, a maximum camber height is defined as H, a radius of a front edge of an inner circumferential side of the blade is defined as R, a blade inlet angle is defined as ⁇ 1 , and a blade exit angle is defined as ⁇ 2 , respectively.
  • a fan-diameter D and the radius R of the front edge of an inner circumferential side of the blade illustrations are omitted.
  • the fan-diameter D is a diameter of an outer circumferential circle of the blade 8 of the sirocco fan 1.
  • the blade chord length L is a length of a straight line 11 that connects an inner circumferential end 9a and an outer circumferential end 9b of a warped line 9 of the blade 8.
  • the maximum camber height H is a maximum length of a perpendicular line 12 for the warped line 9 of the blade 8 from the straight line 11.
  • the blade inlet angle ⁇ 1 is an angle formed by an inner circumferential tangent 13 and a warped line tangent 14 at the inner circumferential end 9a of the warped line 9 of the blade 8.
  • the blade exit angle ⁇ 2 is an angle formed by an outer circumferential tangent 15 and a warped line tangent 16 at the outer circumferential end 9b of the warped line 9 of the blade 8.
  • An incidence angle ⁇ is an angle formed by the camber line tangent 14 and an inflow direction of airflow at the inner circumferential end 9a of the warped line 9 of the blade 8.
  • the radius R of the front edge at the inner circumferential side of the blade is a radius of a circular arc portion formed at the front edge of the blade 8.
  • the sirocco fan 100 has a shortcoming such that the air-blowing amount is small at a time of a predetermined noise occurrence compared with that of the sirocco fan 1. This is because the air-blowing amount becomes small at the time of a predetermined noise occurrence because H/L is small, R/L is large, angles of ⁇ 1 and P 2 are inappropriate, and so forth.
  • the sirocco fan 100 is mounted on the indoor unit 10, performance of the heat exchanger 3 is reduced, loads of the compressor being increased, and the COP being lowered.
  • the warp of the blade increases and the airflow is peeled off from a blade surface at a negative pressure surface side, so that a stall occurs to cause an increase in the noise value and the number of revolutions.
  • the warp of the blade is reduced and a lifting power of the blade is lowered to cause an increase in the noise value and the number of revolutions.
  • ⁇ 1 is greater than 130°, an area of an inflow portion between the blades is reduced to cause an increase in the noise value and the number of revolutions.
  • ⁇ 2 is smaller than 100°, the incidence angle ⁇ of the blade is increased to bring about the stall to cause an increase in the noise value and the number of revolutions.
  • the warp of the blade is reduced and the lifting power is reduced to cause an increase in the noise value and the number of revolutions.
  • the ⁇ 2 is smaller than 26°, an area of an outflow portion between the blades is reduced to cause an increase in the velocity of the airflow at the outflow portion between the blades. Since the airflow between the blades of the sirocco fan is in a stall state to some extent, when the velocity at the outflow portion between the blades is increased, a re-adhesion of the flow that has stalled in the vicinity of the front edge occurs in the vicinity of the rear edge. When the re-adhesion occurs, a fluctuation in the static pressure on a blade surface is increased to cause an increase in the noise.
  • a sirocco fan 1X is defined in such a way that the negative pressure surface side of the front edge is almost linearly cut off as illustrated in Fig. 5 .
  • the front edge of the sirocco fan 1 has a shape composed of a semicircular arc.
  • Figs. 6 and 7 a relative velocity distribution of the airflow inside of the fan in the vicinity of a main plate at 1100 rpm is shown.
  • Table 11 the static pressure of the fan under a single operation is shown (1100 rpm, and the air-blowing amount 8 m 3 /min).
  • the velocity distribution in the vicinity of the front edge at the negative pressure surface side of the sirocco fan 1X is greater. This is because, primarily, the velocity of the blowing air on the negative pressure surface side of the front edge where the a wind easily blows is increased by cutting off the negative pressure surface side, and the number of revolutions and the noise value are reduced as shown in Table 10.
  • the highest static pressure can be obtained at the same number of revolutions and air-blowing amount by the sirocco fan 1X in which the negative pressure surface side of the front edge is cut off, and an effect appears that the wind is easier to blow by cutting off the negative pressure surface side of the front edge.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
EP08722746.8A 2007-03-27 2008-03-25 Sirocco fan and air conditioner Active EP2131041B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007081120 2007-03-27
PCT/JP2008/055483 WO2008123212A1 (ja) 2007-03-27 2008-03-25 シロッコファン及び空気調和装置

Publications (3)

Publication Number Publication Date
EP2131041A1 EP2131041A1 (en) 2009-12-09
EP2131041A4 EP2131041A4 (en) 2013-11-13
EP2131041B1 true EP2131041B1 (en) 2018-08-22

Family

ID=39830707

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08722746.8A Active EP2131041B1 (en) 2007-03-27 2008-03-25 Sirocco fan and air conditioner

Country Status (9)

Country Link
EP (1) EP2131041B1 (ja)
JP (1) JP5235867B2 (ja)
KR (1) KR101122802B1 (ja)
CN (1) CN101595309B (ja)
AU (1) AU2008236113B2 (ja)
ES (1) ES2689721T3 (ja)
HK (1) HK1135161A1 (ja)
TW (1) TW200916662A (ja)
WO (1) WO2008123212A1 (ja)

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DE102008034905A1 (de) * 2008-07-26 2010-01-28 Ltg Aktiengesellschaft Lufttechnische Einrichtung
WO2010125645A1 (ja) * 2009-04-28 2010-11-04 三菱電機株式会社 プロペラファン
US10323853B2 (en) 2013-07-31 2019-06-18 Broan-Nutone Llc Ventilation system and method
JP5783214B2 (ja) * 2013-09-30 2015-09-24 ダイキン工業株式会社 遠心送風機及びこれを備えた空気調和機
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
CN104165158B (zh) * 2014-08-06 2016-09-21 宁波方太厨具有限公司 一种吸油烟机的离心风机
CN106704259A (zh) * 2015-08-03 2017-05-24 江森自控楼宇设备科技(无锡)有限公司 叶片
JP5886463B1 (ja) * 2015-08-07 2016-03-16 伸和コントロールズ株式会社 空気調和装置及びその運転方法
CN105201907B (zh) * 2015-09-22 2017-10-13 宁波奥克斯空调有限公司 一种西洛克风叶及其设计方法
KR101799154B1 (ko) * 2015-10-01 2017-11-17 엘지전자 주식회사 원심팬
US20170342992A1 (en) * 2016-05-24 2017-11-30 Regal Beloit America, Inc. Low Noise High Efficiency Centrifugal Blower
KR102677252B1 (ko) * 2017-01-18 2024-06-24 삼성전자주식회사 팬 어셈블리 및 이를 갖는 세탁기
CN110360150B (zh) * 2019-07-08 2020-08-21 珠海格力电器股份有限公司 风轮、离心风机及空调器室内机
JP7394614B2 (ja) * 2019-12-18 2023-12-08 サンデン株式会社 遠心送風機
CN111734675B (zh) * 2020-06-16 2021-12-03 泛仕达机电股份有限公司 一种后向离心风轮及离心风机

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JP2827613B2 (ja) * 1991-10-07 1998-11-25 松下電器産業株式会社 羽根曲面計算作図装置
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Also Published As

Publication number Publication date
EP2131041A4 (en) 2013-11-13
KR20090086640A (ko) 2009-08-13
CN101595309A (zh) 2009-12-02
WO2008123212A1 (ja) 2008-10-16
HK1135161A1 (en) 2010-05-28
JPWO2008123212A1 (ja) 2010-07-15
TW200916662A (en) 2009-04-16
ES2689721T3 (es) 2018-11-15
AU2008236113B2 (en) 2010-11-18
KR101122802B1 (ko) 2012-03-22
AU2008236113A1 (en) 2008-10-16
CN101595309B (zh) 2011-07-13
JP5235867B2 (ja) 2013-07-10
TWI352779B (ja) 2011-11-21
EP2131041A1 (en) 2009-12-09

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