EP2280176A1 - Querstromlüfter und klimaanlage damit - Google Patents

Querstromlüfter und klimaanlage damit Download PDF

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Publication number
EP2280176A1
EP2280176A1 EP09742709A EP09742709A EP2280176A1 EP 2280176 A1 EP2280176 A1 EP 2280176A1 EP 09742709 A EP09742709 A EP 09742709A EP 09742709 A EP09742709 A EP 09742709A EP 2280176 A1 EP2280176 A1 EP 2280176A1
Authority
EP
European Patent Office
Prior art keywords
blade
impeller
pressure surface
notches
negative pressure
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.)
Granted
Application number
EP09742709A
Other languages
English (en)
French (fr)
Other versions
EP2280176B1 (de
EP2280176A4 (de
Inventor
Hironobu Teraoka
Shimei Tei
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.)
Daikin Industries Ltd
Original Assignee
Daikin Industries 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
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of EP2280176A1 publication Critical patent/EP2280176A1/de
Publication of EP2280176A4 publication Critical patent/EP2280176A4/de
Application granted granted Critical
Publication of EP2280176B1 publication Critical patent/EP2280176B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/06—Helico-centrifugal pumps
    • 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
    • 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
    • F24F1/0025—Cross-flow or tangential 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
    • F24F1/0057—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in or on a wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers

Definitions

  • the present invention relates to a crossflow fan and an air conditioner having the crossflow fan.
  • Crossflow fans are known as air blowers as used in an indoor unit of a wall-mounted air conditioner.
  • Fig. 14 shows one example of a crossflow fan.
  • a crossflow fan 104 is a type of fan through which air flow crosses transversely, and includes an impeller 141 formed by a number of blades 142.
  • the blades 142 are forward-swept blades, in each of which the outer edge is located on the leading side from the inner edge with respect to the rotation direction Z1.
  • cooled or heated air flow X that is, conditioned air flow
  • an indoor unit 1 of the air conditioner transversely passes through the impeller 141, in a plane perpendicular to the rotation axis Z of the impeller 141.
  • FIGs. 15(a) and 15(b) are perspective views showing an impeller blade of such a crossflow fan. As shown in Figs. 15(a) and 15(b) , a plurality of notches 242b are formed at predetermined intervals at an outer edge 242a of a plate-like blade 242. A straight section 242c is formed between each adjacent pair of the notches 242b. As shown in Fig.
  • each notch 242b extends in a direction substantially perpendicular to the sides of the blade 242.
  • the notches 242b which are formed in the blade 242 as described above, reduce trailing vortices (not shown) generated at an outlet region M of a crossflow fan 204. In other words, a simple modification to the shape of the blade 242 effectively reduces the noise of the crossflow fan 204.
  • Patent Document 1 Japanese Laid-Open Patent Publication No. 2006-125390
  • a crossflow fan includes an impeller having a plurality of support plates located on a rotation axis of the impeller and a plurality of plate-like blades provided at peripheral portions of the support plates.
  • the blades extend parallel to the rotation axis.
  • Each blade is inclined such that its outer edge is located on the leading side of its inner edge with respect to the rotation direction of the impeller.
  • One of the faces of each blade that is on the leading side of the rotation direction of the impeller forms a positive pressure surface.
  • the face on the trailing side of the rotation direction forms a negative pressure surface.
  • a plurality of notches are formed at the outer edge of each blade. The notches are arranged at predetermined intervals along the rotation axis of the impeller. At least one of a positive pressure corner and a negative pressure corner, which connect the bottom of each notch with the positive pressure surface and the negative pressure surface, respectively, is rounded.
  • the predetermined intervals may be the same intervals or may vary according to the position in the longitudinal direction of the blade.
  • the negative pressure corner which connects the bottom of each notch with the negative pressure surface, may be rounded.
  • the positive pressure corner which connects the bottom of each notch with the positive pressure surface, may be rounded.
  • a crossflow fan includes an impeller having a plurality of support plates located on a rotation axis of the impeller and a plurality of plate-like blades provided at peripheral portions of the support plates.
  • the blades extend parallel to the rotation axis.
  • Each blade is inclined such that its outer edge is located on the leading side of its inner edge with respect to the rotation direction of the impeller.
  • One of the faces of each blade that is on the leading side of the rotation direction of the impeller forms a positive pressure surface.
  • the face on the trailing side of the rotation direction forms a negative pressure surface.
  • a plurality of notches are formed at the outer edge of each blade. The notches are arranged at predetermined intervals along the rotation axis of the impeller.
  • the bottom of each notch is formed as a smooth curved surface that protrudes as a whole outward of the impeller.
  • the predetermined intervals may be the same intervals or may vary according to the position in the longitudinal direction of the blade.
  • the notches are preferably V-shaped as viewed from the negative pressure surface and the pressure surface of the blade,
  • the present invention also provides an air conditioner having a crossflow fan having the above described configuration.
  • the notches are formed in the outer edge of the blade, noise is effectively reduced with a simple structure.
  • At least one of the positive pressure corner and negative pressure corner, which connects the bottom of the notch with the positive pressure surface and the negative pressure surface, respectively, is rounded. Therefore, air that flows into the notches from the outer side of the blade is allowed to flow smoothly into the impeller along the negative pressure surface and the positive pressure surface. This reduces the collision loss generated when air flows in from outside of the blade. As a result, required increased power output from the electric motor driving the crossflow fan caused by the formation of the notches in the blades can be reduced.
  • an air conditioner includes a wall-mounted indoor unit 1.
  • the indoor unit 1 includes a main casing 2, a heat exchanger 3 arranged in the main casing 2, and a crossflow fan 4.
  • the crossflow fan 4 has an impeller 41 having plate-like blades 42.
  • the impeller 41 is driven by an electric motor (not shown) to compress and send air from an inlet region N to an outlet region M.
  • Air inlet ports 21 are provided in upper and front face of the main casing 2.
  • An air outlet port 22 is provided in a lower face of the main casing 2.
  • vertical flaps 23 and a horizontal flap 24 for adjusting the direction of air discharged from the air outlet port 22 are provided.
  • a guide portion 25 is formed in the main casing 2 at a position in the vicinity of the outlet region M of the crossflow fan 4.
  • the guide portion 25 defines the passage of air discharged by the crossflow fan 4.
  • a backflow preventing tongue 26 is formed at the air outlet port 22.
  • the backflow preventing tongue 26 separates the outlet region M and the inlet region N from each other, thereby preventing discharged air from flowing back.
  • the heat exchanger 3 is located between the air inlet port 21 and the impeller 41, and formed by a front heat exchanging section 3a and a back heat exchanging section 3b.
  • the front heat exchanging section 3a is located in the main casing 2 near the front face.
  • the back heat exchanging section 3b is continuously formed at the top of the front heat exchanging section 3a, and is located in the main casing 2 near the back face.
  • the impeller 41 of the crossflow fan 4 is formed by a great number of the blades 42, circular support plates 43, and an input shaft 44.
  • the support plates 43 support the blades 42 and are located on the rotation axis A1 of the impeller 41.
  • the input shaft 44 is connected to the electric motor and extends along the rotation axis A1.
  • the support plates 43 are arranged parallel to each other at predetermined intervals along the rotation axis A1 of the impeller 41, or the longitudinal direction of the blades 42.
  • the blades 42 are fixed to peripheral portions 43a of the support plates 43 and arranged between adjacent two support plates 43 to extend parallel to the rotation axis A1.
  • each blade 42 will be described with reference to Figs. 3 and 4 .
  • the blades 42 are forward-swept. That is, each blade 42 is inclined such that the outer edge 42a is located on the leading side of the inner edge 42d with respect to a rotation direction Z1 of the impeller 41.
  • the face of each blade 42 that is located on the leading side of the rotation direction Z1 forms a positive pressure surface 42p, and a face located on the trailing side forms a negative pressure surface 42q.
  • the blade 42 is also curved such that the outer edge 42a is located on the leading side of the inner edge 42d with respect to the rotation direction Z1 of the impeller 41.
  • Notches 42b are formed at the outer edge 42a of the blade 42.
  • the notches 42b are arranged at predetermined intervals along the rotation axis A1 of the impeller 41.
  • the notches 42b are V-shaped when viewed from the negative pressure surface 42q and the positive pressure surface 42p of the blade 42.
  • a basic shape section 42c is formed between each adjacent pair of the notches 42b.
  • the basic shape sections 42c form the curved basic shape of the blade 42.
  • the width of the space between adjacent notches 42b may be constant or may vary. For example, as shown in Figs. 3 and 4 , each end 6a of the blade 42 with respect to the rotation axis A1 is close to the corresponding support plate 43.
  • the flow velocity of air flow X at each end 6a is greater than that in a center 6b of the blade 42 in the rotation axis A1.
  • the space between notches 42b at each end 6a of the blade 42 is greater than the space between notches 42b at the center 6b of the blade 42. This ensures a sufficient pressure receiving area at each end 6a of the blade 42.
  • the notches 42b may have the same size, but may have different sizes depending on position on the rotation axis A1. In the present embodiment, notches 42b at each end 6a of the blade 42 in the rotation axis A1 have a smaller size than notches 42b at the center 6b of the blade 42. This ensures a sufficient pressure receiving area at each end 6a of the blade 42.
  • the notches 42b formed at the outer edge 42a of the blade 42 at predetermined intervals, and the basic shape sections 42c are each formed between adjacent notches 42b as shown in Fig. 4 . This reduces trailing vortices (not shown) generated at the outlet region M of the crossflow fan 4, so that noise is reduced with a simple structure.
  • the notches 42b are V-shaped when viewed from the negative pressure surface 42q and the positive pressure surface 42p of the blade 42. Thus, compared to a case where notches 42b have rectangular shapes, the pressure receiving area of the blade 42 is enlarged.
  • Fig. 5 is a cross-sectional view of the blade 42 taken along line 5-5 of Fig. 4
  • Fig. 6 is a perspective view showing a cross section of a notch 42b.
  • the bottom 42y of the notch 42b is connected to the negative pressure surface 42q at a negative pressure corner 42m, and connected to the positive pressure surface 42p at a positive pressure corner 42n.
  • the negative pressure corner 42m and the positive pressure corner 42n are both rounded.
  • each notch 42b which extends perpendicularly to the negative pressure surface 42q of the blade 42, and the negative pressure surface 42q are smoothly connected to each other by the negative pressure corner 42m.
  • the bottom 42y of each notch 42b, which extends perpendicularly to the positive pressure surface 42p of the blade 42, and the positive pressure surface 42p are smoothly connected to each other by the positive pressure corner 42n. Therefore, the length of the bottom 42y, which extends perpendicularly to the positive pressure surface 42p and the negative pressure surface 42q, is less than that of the bottom 242y of the prior art notch 242b (see Fig. 16 ).
  • the negative pressure corner 42m and the positive pressure corner 42n are rounded to form smooth and curved surfaces. This allows the air flow X that flows into the notches 42b from outside of the blade 42 to flow smoothly along the negative pressure surface 42q and into the impeller 41. As a result, the collision loss generated when the air flow X flows from outside of the blade 42 into the notches 42b is reduced.
  • the crossflow fan 4 according to the present embodiment has the following advantages.
  • the air conditioner of the present embodiment has the crossflow fan 4, which achieves the advantages (1) and (2).
  • the air conditioner therefore achieves the same advantages as the advantages (1) and (2).
  • the negative pressure corner 42m and the positive pressure corner 42n are both rounded. Instead, only one of the negative pressure corner 42m and the positive pressure corner 42n may be rounded.
  • Fig. 8 illustrates a configuration in which only the negative pressure corner 42m is rounded.
  • Fig. 9 illustrates a configuration in which only the positive pressure corner 42n is rounded. Even with these configurations, the increase in power output required from the electric motor driving the crossflow fan 4 caused by the formation of the notches in the blades 42 can be reduced.
  • the bottom 42y of the notch 42b may be formed as a smooth curved surface that protrudes outward as a whole.
  • This structure allows the air flow X that flows into the notches 42b from outside of the blade 42 to flow smoothly along the negative pressure surface 42q or the positive pressure surface 42p and into the impeller 41. This further reduces the collision loss generated when air flows into the notches 42b from outside of the blade 42. As a result, required increased power output from the electric motor driving the crossflow fan can be reduced.
  • the notches 42b are V-shaped when viewed from the negative pressure surface 42q and the positive pressure surface 42p of the blade 42.
  • this configuration may be changed.
  • notches 42b may have a rectangular shape as viewed from the negative pressure surface 42q and the positive pressure surface 42p of the blade 42.
  • a cross sectional view taken along line 5-5 of Fig. 12 is the same as Fig. 5 .
  • the notches 42b are rectangular, the increase of the power output of the electric motor driving the crossflow fan 4 caused by the formation of the notches in the blades 42 can be reduced, as long as at least one of the negative pressure corner 42m and the positive pressure corner 42n is rounded.
  • the bottom 42y of the notch 42b may be formed as a smooth curved surface that protrudes as a whole outward of the impeller 41.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
EP09742709.0A 2008-05-09 2009-04-30 Querstromlüfter und klimaanlage damit Active EP2280176B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008123449A JP4371171B2 (ja) 2008-05-09 2008-05-09 クロスフローファン及びこれを備えた空気調和機
PCT/JP2009/058448 WO2009136585A1 (ja) 2008-05-09 2009-04-30 クロスフローファン及びこれを備えた空気調和機

Publications (3)

Publication Number Publication Date
EP2280176A1 true EP2280176A1 (de) 2011-02-02
EP2280176A4 EP2280176A4 (de) 2016-10-26
EP2280176B1 EP2280176B1 (de) 2020-01-22

Family

ID=41264640

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09742709.0A Active EP2280176B1 (de) 2008-05-09 2009-04-30 Querstromlüfter und klimaanlage damit

Country Status (8)

Country Link
US (1) US20110033306A1 (de)
EP (1) EP2280176B1 (de)
JP (1) JP4371171B2 (de)
KR (1) KR101233538B1 (de)
CN (1) CN101999044B (de)
AU (1) AU2009245176B2 (de)
ES (1) ES2784543T3 (de)
WO (1) WO2009136585A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2672080A3 (de) * 2012-06-08 2017-07-19 General Electric Company Aerodynamisches Element eines Turbinenmotors

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6044165B2 (ja) * 2012-08-09 2016-12-14 ダイキン工業株式会社 多翼ファン及びこれを備える空気調和機の室内機
JP5747888B2 (ja) * 2012-09-28 2015-07-15 ダイキン工業株式会社 送風機
US9651057B2 (en) * 2013-12-19 2017-05-16 Regal Beloit America, Inc. Blower assembly including a noise attenuating impeller and method for assembling the same

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US3403893A (en) * 1967-12-05 1968-10-01 Gen Electric Axial flow compressor blades
JPH03210094A (ja) * 1990-01-11 1991-09-13 Matsushita Electric Ind Co Ltd クロスフローファン
NL9301910A (nl) * 1993-11-04 1995-06-01 Stork Prod Eng Windturbine.
JP3127850B2 (ja) * 1997-02-13 2001-01-29 ダイキン工業株式会社 プロペラファン用羽根車
JPH10252689A (ja) * 1997-03-17 1998-09-22 Mitsubishi Electric Corp クロスフローファン及びクロスフローファン搭載空気調和機
JP3092554B2 (ja) * 1997-09-30 2000-09-25 ダイキン工業株式会社 遠心送風機及びその製造方法並びに該遠心送風機を備えた空気調和機
JPH11141494A (ja) * 1997-11-10 1999-05-25 Daikin Ind Ltd 多翼送風機の羽根車構造
JP4432865B2 (ja) 2004-09-30 2010-03-17 ダイキン工業株式会社 送風機の羽根車およびそれを用いた空気調和機
JP4873845B2 (ja) * 2004-10-01 2012-02-08 三菱電機株式会社 空気調和機
JP3995010B2 (ja) * 2005-09-28 2007-10-24 ダイキン工業株式会社 多翼送風機の羽根車及びその製造方法
JP4973249B2 (ja) * 2006-03-31 2012-07-11 ダイキン工業株式会社 多翼ファン
JP4918650B2 (ja) * 2006-06-23 2012-04-18 ダイキン工業株式会社 多翼ファン
JP4433093B2 (ja) * 2008-05-09 2010-03-17 ダイキン工業株式会社 クロスフローファン及びこれを備えた空気調和機
CN102341601B (zh) * 2009-03-10 2014-07-23 大金工业株式会社 横流风扇和具有该横流风扇的空调机

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2672080A3 (de) * 2012-06-08 2017-07-19 General Electric Company Aerodynamisches Element eines Turbinenmotors

Also Published As

Publication number Publication date
ES2784543T3 (es) 2020-09-28
CN101999044B (zh) 2012-10-17
KR101233538B1 (ko) 2013-02-14
CN101999044A (zh) 2011-03-30
EP2280176B1 (de) 2020-01-22
AU2009245176B2 (en) 2011-08-11
JP2009270530A (ja) 2009-11-19
KR20100135831A (ko) 2010-12-27
US20110033306A1 (en) 2011-02-10
WO2009136585A1 (ja) 2009-11-12
JP4371171B2 (ja) 2009-11-25
EP2280176A4 (de) 2016-10-26
AU2009245176A1 (en) 2009-11-12

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