EP3486495A1 - Multiblade centrifugal fan - Google Patents

Multiblade centrifugal fan Download PDF

Info

Publication number
EP3486495A1
EP3486495A1 EP18187588.1A EP18187588A EP3486495A1 EP 3486495 A1 EP3486495 A1 EP 3486495A1 EP 18187588 A EP18187588 A EP 18187588A EP 3486495 A1 EP3486495 A1 EP 3486495A1
Authority
EP
European Patent Office
Prior art keywords
pressure side
side connection
impeller
blade
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.)
Withdrawn
Application number
EP18187588.1A
Other languages
German (de)
English (en)
French (fr)
Inventor
Akihiro Shigeta
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.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management 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
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Publication of EP3486495A1 publication Critical patent/EP3486495A1/en
Withdrawn legal-status Critical Current

Links

Images

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
    • 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
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
    • F04D29/162—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of a centrifugal flow wheel
    • 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
    • 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
    • F05D2240/307—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 tip of a rotor blade

Definitions

  • the present invention relates to a sirocco fan which is a multiblade centrifugal fan used in an air conditioner or the like for example.
  • a multiblade centrifugal fan of this kind includes a scroll casing 101 and an impeller 102, as illustrated in FIG. 10 , FIG. 11 and FIG. 12 (for example, see Japanese Patent No. 4736748 ).
  • the multiblade centrifugal fan includes a scroll casing 101 including an air outlet 103 and a bellmouth 104 serving as an air inlet; and a multiblade centrifugal impeller 102 disposed inside the scroll casing 101, including many blades 107 annularly arranged from a main plate 106 integrated with a bearing 105, and blowing off air sucked from an inlet 108 formed at an end in a rotation axis direction facing the bellmouth 104 into a centrifugal direction from between the blades 107 (W in the figure).
  • a holding ring 109 for holding the blades 107 is provided on an axial end part on an outer periphery of the impeller 102, and on an axial outer end of the holding ring 109, a cylindrical body 110 is integrally extended so as to reach substantially the same position as an exit side end edge 104a of the bellmouth 104 or a position to mutually overlap with the exit side end edge 104a, and an outer peripheral surface of the cylindrical body 110 is extended in a circular arc shape so that a diameter of the outer peripheral surface is gradually enlarged from the outer peripheral surface at the axial outer end of the holding ring 109.
  • an axial end part 107a of the blade 107 is a roughly flat shape as illustrated in FIG. 12 , and there is a problem that, when the circulating flow W' flows in from the axial end part of the blade 107 and returns between the blades 107, the air flow separates at a corner of the axial end part of the blade 107 and noise increases.
  • a multiblade centrifugal fan of the present invention is configured such that, in the multiblade centrifugal fan including: an impeller including a main plate, a plurality of blades disposed on an outer periphery of the main plate radially with respect to a center axis of the main plate, and a holding ring to fix an outer periphery of the plurality of blades on a side opposite to a part where the blades and the main plate are joined; and a scroll casing disposed to surround the impeller, the scroll casing including an air outlet, and a bellmouth serving as an air inlet, each of the blades is stretched in a direction from the main plate to the holding ring and includes a suction surface having a negative pressure when the impeller is rotated, a pressure surface having a positive pressure when the impeller is rotated, a blade side part being an axial end part of the impeller, at least one negative pressure side connection surface configured between the suction surface and the blade side part, and
  • connection part is formed at an obtuse angle compared to a roughly right-angled square shape, and separation of an air flow colliding with the blade side part is reduced.
  • the air flow which collides with the blade side part and separates sticks again to the connection surface and flows into the suction surface and the pressure surface along the negative pressure side connection surface or the positive pressure side connection surface.
  • the multiblade centrifugal fan of the present invention suppresses a disturbance of a circulating flow in which part of the air flow blown off in the centrifugal direction from the impeller passes through a gap between the bellmouth and the holding ring and is sucked again from the blade side part to between the blades, and noise due to the circulating flow can be reduced.
  • a first invention is configured such that, in the multiblade centrifugal fan including: an impeller including a main plate, a plurality of blades disposed on an outer periphery of the main plate radially with respect to a center axis of the main plate, and a holding ring to fix an outer periphery of the plurality of blades on a side opposite to a part where the blades and the main plate are joined; and a scroll casing disposed to surround the impeller, the scroll casing including an air outlet, and a bellmouth serving as an air inlet, each of the blades is stretched in a direction from the main plate to the holding ring and includes a suction surface having a negative pressure when the impeller is rotated, a pressure surface having a positive pressure when the impeller is rotated, a blade side part being an axial end part of the impeller, at least one negative pressure side connection surface configured between the suction surface and the blade side part, and at least one positive pressure side connection surface configured between the pressure surface and the blade side part
  • connection part is formed at an obtuse angle compared to a roughly right-angled square shape, and separation of an air flow colliding with the blade side part is reduced.
  • the air flow which collides with the blade side part and separates sticks again to the connection surface and flows into the suction surface and the pressure surface along the negative pressure side connection surface or the positive pressure side connection surface.
  • a second invention is that at least one of the negative pressure side connection surface and the positive pressure side connection surface is in an arc shape in the cross-sectional view in which the blade is cut in the center axis direction of the impeller at the arbitrary position.
  • At least one of the negative pressure side connection surface and the positive pressure side connection surface be in the arc shape in the cross-sectional view in which the blade is cut in the center axis direction of the impeller at the arbitrary position, the separation of the air flow colliding with the blade side part is reduced, compared to a polygon with sides.
  • the separation of the air flow increases.
  • a third invention is that, for the arc shape of the negative pressure side connection surface or the positive pressure side connection surface, a curvature is reduced from an inner periphery of the impeller to the outer periphery.
  • FIG. 1 illustrates a perspective view of the multiblade centrifugal fan in a first embodiment of the present invention.
  • FIG. 2 illustrates an A-A' cross section of the multiblade centrifugal fan in the first embodiment of the present invention.
  • FIG. 3 illustrates a B-B' cross section of the multiblade centrifugal fan in the first embodiment of the present invention.
  • FIG. 4 illustrates a perspective view of the impeller of the multiblade centrifugal fan in the first embodiment of the present invention.
  • the multiblade centrifugal fan includes an impeller 1 and a scroll casing 2.
  • the impeller 1 includes a main plate 3, a bearing 4 disposed at a substantially center of the main plate 3 and integrated with the main plate 3, a plurality of blades 5 disposed on the outer periphery of the main plate 3 radially with respect to the center axis of the main plate 3 so as to be tilted forward to a rotation direction M, and a holding ring 6 which fixes the outer periphery of the plurality of blades 5 on a side opposite to a part where the blades 5 and the main plate 3 are joined.
  • a rotating shaft of a fan motor (not illustrated) is pivoted.
  • the scroll casing 2 includes an air outlet 7, a bellmouth 8 serving as an air inlet, and a tongue part 9 in a circular arc shape disposed at a position at which a gap between the outer periphery of the impeller 1 and the inner periphery of the scroll casing 2 is minimum.
  • FIG. 5 illustrates a perspective view of the blade of the multiblade centrifugal fan in the first embodiment of the present invention.
  • FIG. 6 illustrates a C-C' cross section of the blade in the first embodiment of the present invention.
  • the blade 5 is stretched in an axial direction between the main plate 3 and the holding ring 6, and includes: a suction surface 5a where the pressure of the air becomes low in the case where the impeller 1 is rotated in a rotating direction M; a pressure surface 5b where the pressure of the air becomes high in the case that the impeller 1 is rotated in the rotating direction M; a blade side part 5c to be an axial end part of the impeller 1; a negative pressure side connection surface 5d including the suction surface 5a and the blade side part 5c; a positive pressure side connection surface 5e including the pressure surface 5b and the blade side part 5c; a first negative pressure side connection part 5f to be a connection part of the blade side part 5c and the negative pressure side connection surface 5d: a second negative pressure side connection part 5g to be a connection part of the suction surface 5a and the negative pressure side connection surface 5d; a first positive pressure side connection part 5h to be a connection part of the blade side part 5c and the positive pressure side
  • the negative pressure side connection surface 5d and the positive pressure side connection surface 5e are formed in the arc shape on a C-C' cross section such that an angle formed by a line connecting the first negative pressure side connection part with the second negative pressure side connection part and the substantially center line in the C-C' cross-sectional view, and an angle formed by a line connecting the first positive pressure side connection part with the second positive pressure side connection part and the substantially center line in the C-C' cross-sectional view become smaller than 90°.
  • the air is blown by the series of flow, and in the multiblade centrifugal fan like the one of the present embodiment in particular, the air jetted to the outer periphery of the impeller 1 at a high speed is converted to the pressure when the speed is lowered as the gap between the impeller 1 and the scroll casing 2 is enlarged from the tongue part 9, and compatibility of a high air volume and a static pressure is realized.
  • the negative pressure side connection surface 5d and the positive pressure side connection surface 5e are configured in the arc shape on the C-C' cross section such that the angle formed by the line connecting the first negative pressure side connection part with the second negative pressure side connection part and the substantially center line in the cross-sectional view in which the blade 5 is cut in the center axis direction of the impeller 1 at the arbitrary position, and the angle formed by the line connecting the first positive pressure side connection part with the second positive pressure side connection part and the substantially center line in the cross-sectional view in which the blade 5 is cut in the center axis direction of the impeller 1 at the arbitrary position become smaller than 90°, the respective connection parts 5f, 5g, 5h and 5i are formed at an obtuse angle compared to a roughly right-angled square shape, and the separation of the air flow colliding with the blade side part 5c is reduced.
  • the air flow which collides with the blade side part 5c and separates sticks again to the negative pressure side connection surface 5d and the positive pressure side connection surface 5e, and flows into the suction surface 5a and the pressure surface 5b along a wall surface as it is.
  • the negative pressure side connection surface 5d and the positive pressure side connection surface 5e are configured in the arc shape such that the angle formed by the line connecting the first negative pressure side connection part with the second negative pressure side connection part and the substantially center line in the cross-sectional view in which the blade 5 is cut in the center axis direction of the impeller 1 at the arbitrary position, and the angle formed by the line connecting the first positive pressure side connection part with the second positive pressure side connection part and the substantially center line in the cross-sectional view in which the blade 5 is cut in the center axis direction of the impeller 1 at the arbitrary position become smaller than 90°, the separation of the air flow colliding with the blade side part 5c is reduced, and the air flow which collides with the blade side part 5c and separates sticks again to the negative pressure side connection surface 5d and the positive pressure side connection surface 5e, and flows into the suction surface 5a and the pressure surface 5b along a wall surface as it is.
  • FIG. 7 illustrates a comparison diagram of the curvature on the cross section of the blade in the first embodiment of the present invention.
  • both of the negative pressure side connection surface 5d and the positive pressure side connection surface 5e are formed in the arc shape on the axial cross section of the blade 5 such that the angle formed by the line connecting the first negative pressure side connection part with the second negative pressure side connection part and the substantially center line in the cross-sectional view in which the blade 5 is cut in the center axis direction of the impeller 1 at the arbitrary position, and the angle formed by the line connecting the first positive pressure side connection part with the second positive pressure side connection part and the substantially center line in the cross-sectional view in which the blade 5 is cut in the center axis direction of the impeller 1 at the arbitrary position become smaller than 90°; however, a similar effect can be obtained with either one.
  • FIG. 8 illustrates a diagram of a polygonal shape of the cross section of the blade in the first embodiment of the present invention.
  • shapes of the negative pressure side connection surface 5d and the positive pressure side connection surface 5e are in the arc shape in the cross-sectional view in which the blade 5 is cut in the center axis direction of the impeller 1 at the arbitrary position; however, the similar effect can be obtained even in the case of the polygonal shape such as a two-side shape as illustrated in FIG. 8 .
  • the separation of the circulating flow W' on the negative pressure side connection surface 5d and the positive pressure side connection surface 5e can be suppressed to be small and the noise due to the circulating flow W' can be suppressed.
  • FIG. 9 illustrates a perspective view of the connection part of the blade and the holding ring in the first embodiment of the present invention.
  • connection part of the blade 5 and the holding ring 6 in the present embodiment by configuring a groove part 10 such that the angle formed with the substantially center line in the cross-sectional view in which the blade 5 is cut in the center axis direction of the impeller 1 at the arbitrary position becomes smaller than 90° for at least either one of the side of the suction surface 5a and the side of the pressure surface 5b, the separation of the circulating flow W' at the connection part of the holding ring 6 and the blade 5 is suppressed, and the noise of the multiblade centrifugal fan can be reduced further.
  • the multiblade centrifugal fan according to the present invention suppresses the separation at the blade side part of the circulating flow in which part of the air flow jetted from the impeller outer periphery flows in from between the blades, and is applicable for purposes of an air conditioner, an air cleaner, a drier and a car air conditioner or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP18187588.1A 2017-11-15 2018-08-06 Multiblade centrifugal fan Withdrawn EP3486495A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2017219619A JP6887073B2 (ja) 2017-11-15 2017-11-15 多翼遠心ファン

Publications (1)

Publication Number Publication Date
EP3486495A1 true EP3486495A1 (en) 2019-05-22

Family

ID=63165300

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18187588.1A Withdrawn EP3486495A1 (en) 2017-11-15 2018-08-06 Multiblade centrifugal fan

Country Status (3)

Country Link
EP (1) EP3486495A1 (ja)
JP (1) JP6887073B2 (ja)
CN (1) CN109779967A (ja)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006125229A (ja) * 2004-10-27 2006-05-18 Matsushita Electric Ind Co Ltd シロッコファン
JP4736748B2 (ja) 2005-11-25 2011-07-27 ダイキン工業株式会社 多翼遠心送風機
JP2012140881A (ja) * 2010-12-28 2012-07-26 Daikin Industries Ltd 多翼送風機

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4945859B2 (ja) * 2001-07-19 2012-06-06 ダイキン工業株式会社 遠心送風機の羽根車及びそれを備えた遠心送風機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006125229A (ja) * 2004-10-27 2006-05-18 Matsushita Electric Ind Co Ltd シロッコファン
JP4736748B2 (ja) 2005-11-25 2011-07-27 ダイキン工業株式会社 多翼遠心送風機
JP2012140881A (ja) * 2010-12-28 2012-07-26 Daikin Industries Ltd 多翼送風機

Also Published As

Publication number Publication date
CN109779967A (zh) 2019-05-21
JP2019090368A (ja) 2019-06-13
JP6887073B2 (ja) 2021-06-16

Similar Documents

Publication Publication Date Title
US10584718B2 (en) Impeller and blower
CN111133201B (zh) 螺旋桨式风扇以及轴流式鼓风机
EP3505769A1 (en) Multiblade centrifugal fan
EP3048308A1 (en) Centrifugal fan
EP3196477A1 (en) Centrifugal impeller and centrifugal compressor
JP2014173580A (ja) 送風装置
EP3486495A1 (en) Multiblade centrifugal fan
KR101799154B1 (ko) 원심팬
US20180149158A1 (en) Centrifugal blower
US10859092B2 (en) Impeller and rotating machine
US10844863B2 (en) Centrifugal rotary machine
WO2018179112A1 (ja) コンプレッサのスクロール形状及び過給機
JP2012052431A (ja) 遠心送風機
US20200309149A1 (en) Rotating machinery
JP4904643B2 (ja) 遠心送風機
JP6588999B2 (ja) 遠心式ファン
JP2009013923A (ja) 遠心式送風機
JP2020020338A (ja) 送風機
JP6486459B2 (ja) 遠心送風機
JP6330738B2 (ja) 遠心送風機及びこれを用いた空気調和機
JP2017160807A (ja) 送風機
JP7466707B2 (ja) 遠心送風機
JPH08135596A (ja) 遠心送風機用羽根車
JP6589000B2 (ja) 遠心式ファン
JP6294910B2 (ja) 遠心式ファン

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

17P Request for examination filed

Effective date: 20191122

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

17Q First examination report despatched

Effective date: 20200316

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20200709