EP2295817A2 - Gebläserotor und Gebläse damit - Google Patents

Gebläserotor und Gebläse damit Download PDF

Info

Publication number
EP2295817A2
EP2295817A2 EP10174481A EP10174481A EP2295817A2 EP 2295817 A2 EP2295817 A2 EP 2295817A2 EP 10174481 A EP10174481 A EP 10174481A EP 10174481 A EP10174481 A EP 10174481A EP 2295817 A2 EP2295817 A2 EP 2295817A2
Authority
EP
European Patent Office
Prior art keywords
shroud
air
blowing fan
fan
hub
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Withdrawn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
EP10174481A
Other languages
English (en)
French (fr)
Other versions
EP2295817A3 (de
Inventor
Sachie Tsujikawa
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 Corp
Original Assignee
Panasonic 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 Panasonic Corp filed Critical Panasonic Corp
Publication of EP2295817A2 publication Critical patent/EP2295817A2/de
Publication of EP2295817A3 publication Critical patent/EP2295817A3/de
Withdrawn legal-status Critical Current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
    • 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
    • F04D29/288—Part of the wheel having an ejecting effect, e.g. being bladeless diffuser
    • 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
    • F05D2240/304—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 blowing fan for blowing air in a centrifugal direction, and it also relates to a blower using the same blowing fan.
  • FIG. 12 shows a perspective view of the conventional centrifugal fan disclosed in Patent Literature 1.
  • Fig. 13 shows a partial top view of the conventional centrifugal fan.
  • arrow marks "R" indicate the rotating direction of the centrifugal fan.
  • Centrifugal fan 20 shown in Fig. 12 includes hub-plate 21, annular shroud 22 confronting hub-plate 21, multiple blades 23 placed between hub-plate 21 and shroud 22.
  • Hub-plate 21 is formed of circular outer section 21a and center hole 21b to which a rotary shaft of a motor (not shown) is rigidly mounted.
  • Shroud 22 is formed of circular outer section 22a and center opening 22b.
  • Each one of blades 23 has a three-dimensional shape, and its leading edge 24 formed at an inside end of blade 23 is directed closer to the rotating direction than its tailing edge 25 formed at an outside end of blade 23.
  • Centrifugal fan 20 is driven by the motor, and the spin of fan 20 allows sucking air from opening 22b of shroud 22.
  • the sucked air is guided along blade 23 from leading edge 24 to tailing edge 25, and then the air is blown off outside fan 20.
  • Fig. 13 shows a top view of a part of centrifugal fan 20 viewed from shroud 22.
  • the rotation center is marked with "C”.
  • Tailing edge 25 of blade 23 is formed of hub-side tailing edge 25a and shroud-side tailing edge 25b. Edge 25a is directed closer to the rotating direction than edge 25b. In other words, tailing edge 25 slants relative to the rotary shaft.
  • Fan 20 sucks air from opening 22b of shroud 22 and changes an airflow direction approx. at a right angle, and blows off the air to the outside. If blade 23 forms other shapes than the foregoing three-dimensional shape, the air running through fan 20 chiefly runs closer along hub plate 21. However, the foregoing shape of blade 23, i.e.
  • hub-side tailing edge 25a is directed closer to the rotating direction than shroud-side tailing edge 25b, allows guiding the sucked air from hub plate 21 toward shroud 22 while the air travels from leading edge 24 to tailing edge 25.
  • the foregoing shape of blade 23 thus allows air-speed distribution at tailing edge 25 to be uniformed, where tailing edge 25 works as a blow-off section of fan 20.
  • Leading edge 24 of blade 23 is formed of hub-side leading edge 24a and shroud-side leading edge 24b. As shown in Fig. 13 , entrance angle "Bh" at hub-side leading edge 24a is greater than entrance angle "Bs" at shroud-side leading edge 24b. In other words, the entrance angle of blade 23 tapers from hub plate 21. to shroud 22. An exit angle of tailing edge 25 of blade 23 gradually varies from hub plate 21 to shroud 22. To be more specific, blade 23 of conventional centrifugal fan 20 has a three-dimensional shape where the entrance angle and the exit angle gradually vary from hub plate 21 to shroud 22, and the thickness of blade 23 also gradually varies. This structure allows the air-speed distribution of the blown-off air to be uniformed, so that fan 20 can reduce its noises with the performance maintained.
  • Blade 23 of fan 20 is regularly made of sheet metal, so that blade 23 is thin. It is thus difficult to form the thin blade into the foregoing three-dimensional shape. The gradual variation in thickness among others is the most difficult work. To achieve the foregoing three-dimensional shape, use of two sheets of metal will increase the cost and make it difficult to keep balance during the rotation of the fan. If blade 23 is made of resin instead of sheet metal, the three-dimensional shape can be actually achieved; however, it increases the manufacturing cost. In order to obtain the uniform air-speed distribution, use of the blade in three-dimensional shape will thus increase the manufacturing cost, although the uniform air-speed distribution results in lower noises while the performance of centrifugal fan 20 can be maintained.
  • the present invention aims to provide an inexpensive blowing fan that can achieve uniform air-speed distribution, which results in lower noises while the performance of the blowing fan can be maintained.
  • the blowing fan of the present invention comprises the following structural elements:
  • Fig. 1 shows a perspective view of a blowing fan in accordance with the embodiment of the present invention.
  • Fig. 2 shows a top view of the blowing fan with a shroud removed.
  • Fig. 3 shows a sectional view of the blowing fan.
  • Fig. 4 shows a sectional view of another blowing fan in accordance with the embodiment of the present invention.
  • Fig. 5 shows a sectional view of still another blowing fan in accordance with the embodiment of the present invention.
  • the shroud is mounted to the blowing fan, and the placement of the blades is schematically illustrated.
  • Figs. 3 - 5 show sectional views of the blowing fan including its rotary shaft.
  • Fig. 6A shows a top view of a blower employing the blowing fan in accordance with the embodiment.
  • Fig. 6B shows a sectional view cut along line 6B - 6B in Fig. 6A .
  • Blower 50 includes blowing fan 1 and motor 6, which drives blowing fan 1, in an air duct formed by fan-casing 5 shaped like the shell of a snail. Motor 6 drives blowing fan 1, then air is sucked through sucking port 8 of casing 5 before the air is blown off from blow-off port 9.
  • Blower 50 of this kind can be mounted in, e.g. an air-circulation duct of a washing dryer or a clothes dryer, thereby blowing the air for drying wet clothes.
  • a heater or a dehumidifier can be mounted in the air-circulation duct when necessary.
  • blowing fan 1 includes hub 4, shroud 2 confronting hub 4, and multiple blades 3 placed between hub 4 and shroud 2.
  • Hub 4 is shaped like a disc, and its center section is bowed toward shroud 2.
  • Shroud 2 forms an annular shape having an opening at its center.
  • Hub 4 has hole 4a at its center, and as shown in Fig. 6B , rotary shaft 6a of motor 6 is rigidly mounted into hole 4a with screws 7. Rotation of motor 6 counter-clockwise prompts hub 4, shroud 2, and blades 3 to rotate counter-clockwise in unison, so that the air is sucked from sucking port 8 of casing 5 into the opening of shroud 2. The rotation of blades 3 allows blowing the sucked air in a radial direction toward tailing edges 3a of blades 3, and the air is then blown off from blow-off port 9.
  • tailing edge 3a of each one of blades 3 is provided with notch 30 at a place closer to shroud 2, so that space 11a is formed between blade 3 and shroud 2.
  • This structure is referred to as a first structure hereinafter.
  • Tongue 10 is defined as a space having the narrowest width between casing 5 and fan 1. As a result, an air-speed distribution in fan casing 5 can be uniformed.
  • Space 11a formed by notch 30 can be obtained with ease at a low cost when blade 3 is made of sheet metal. Space 11a allows lowering the maximum air speed in fan-casing 5, so that the BPF noises can be reduced. Space 11a is formed at a place where blade-function is least expected, so that the formation of space 11a little affects the blowing performance of blowing fan 1. As a result, the performance of blower 50 can be maintained while its noises can be reduced. In a case where blades 3 are made of resin, the presence of space 11a formed by notch 30 allows eliminating an undercut shape, namely, blowing fan 1 can be manufactured at a lower cost.
  • FIG. 4 Another structure where a space is formed between blade 3 and shroud 2 is demonstrated hereinafter.
  • This structure is referred to as a second structure.
  • the rim of shroud 2 is flared such that an exit of the air expands relative to slope 2b of shroud 2, thereby forming rim 2a and space 11b.
  • This structure allows the air to flow into space 11b formed between blade 3 and shroud 2, so that an advantage similar to the previous case, where notch 30 forms space 11a, can be obtained.
  • Still another structure where a space is formed between blade 3 and shroud 2 is demonstrated hereinafter.
  • This structure is referred to as a third structure.
  • tailing edge 3a of blade 3 is provided with notch 30 at a place closer to shroud 2, and the rim of shroud 2 is flared such that an exit of the air expands relative to slope 2b of shroud 2, thereby forming rim 2a and space 11c.
  • the third structure combines the first and the second structures. This structure can obtain a greater advantage than the first or the second structure.
  • the third structure particularly effects a greater reduction in the noises. This particular point is detailed later.
  • blowing fan 1 discussed above and blower 50 employing fan 1 is demonstrated hereinafter.
  • the air flowing into the opening of shroud 2 flows between each one of blades 3, and the air then changes its direction approx. at right angle.
  • the air flowing closer to hub 4 changes the direction at a smaller curvature, so that the air flows smooth like a curve and incurs a little reduction in the air speed as well as a relatively little loss in the air duct.
  • This smooth flow of the air as discussed above invites little breakaway phenomenon of air on blade 3.
  • the air flowing closer to shroud 2 changes the direction at a greater curvature, so that the flow of air is curved sharply and incurs a great reduction in the air speed as well as a greater loss in the air duct.
  • the air flow thus invites disturbance, so that breakaway phenomenon of air on the upper side of blade 3 occurs, and the air spirals at some sections. As a result, noises tend to be generated.
  • blowing fan 1 in accordance with the embodiment the air flowing closer to shroud 2 has a smaller air-speed vector directing outside.
  • a space is formed between tailing edge 3a of blade 3 and shroud 2 for the air to flow through this space, so that the air-speed along the outer periphery of fan 1 can be reduced with the aid of this feature.
  • the sizes of spaces 11a, 11b, and 11c are defined this way: not greater than 10% relative to the chord of blade direction (vertical direction in Fig. 3 ), and not greater than 50% relative to the thrust direction (lateral direction in Fig. 3 ). If the sizes of spaces 11a, 11b, and 11c are greater than the foregoing limits, the spaces in fact can produce the advantage in the BPF noise; however, the performance of blowing fan 1 may be lowered. To maintain the performance of fan 1 with the spaces greater than the limits, the rpm of blowing fan 1 should increase, which obliges blowing fan 1 to work at lower efficiency.
  • Fig. 7A schematically illustrates flows of air in fan casing 5 at shroud 2 side.
  • Fig. 7B schematically illustrates flows of air in fan casing 5 at hub 4 side.
  • the air-speed vector of the air flowing toward the outer periphery is smaller at shroud 2 side than at hub 4 side, so that the air at shroud 2 side flows along the circular direction as indicated by arrow marks "A".
  • the airflow has a greater component flowing along the circular direction, the BPF noises are produced.
  • blowing fan 1 in accordance with this embodiment obtains the maximum air-speed of 44 m/sec. Since a sound pressure of pressure pulsation sound is proportionate to airflow speed to the sixth power - airflow speed to the eighth power, the reduction in the max. air-speed from 47 m/sec to 44 m/sec thus effects an great advantage in noise reduction.
  • FIG. 9 illustrates noise characteristics of the blowing fan with the second structure.
  • Fig. 10 illustrates noise characteristics of the' blowing fan with the first structure.
  • Fig. 11 illustrates noise characteristics of the blowing fan with the third structure.
  • Fig. 8 is drawn for a comparison purpose and it illustrates noise characteristics of the blowing fan having no space between the blade and the shroud.
  • Each blowing fan shown in Fig. 8 - Fig. 11 has 28 blades, 5400 rpm.
  • blowing fan shown in Fig. 8 i.e. the fan has no notch 30, spaces 11a, 11b, 11c or rim 2a, incurs noises at 2520 Hz, i.e. BPF, with 28 dB as shown in a circle in Fig. 8 .
  • blowing fan 1 shown in Fig. 9 i.e. fan 1 with the second structure where rim 2a is formed on shroud 2 and space 11b is formed at blade 3, incurs noises at 2520 Hz (BPF) with 26 dB as shown in a circle shown in Fig. 9 .
  • BPF 2520 Hz

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP10174481A 2009-09-11 2010-08-30 Gebläserotor und Gebläse damit Withdrawn EP2295817A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009210072A JP4894900B2 (ja) 2009-09-11 2009-09-11 送風ファンおよびこれを用いた送風機

Publications (2)

Publication Number Publication Date
EP2295817A2 true EP2295817A2 (de) 2011-03-16
EP2295817A3 EP2295817A3 (de) 2012-03-14

Family

ID=43216151

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10174481A Withdrawn EP2295817A3 (de) 2009-09-11 2010-08-30 Gebläserotor und Gebläse damit

Country Status (4)

Country Link
EP (1) EP2295817A3 (de)
JP (1) JP4894900B2 (de)
CN (2) CN201851371U (de)
TW (1) TWI418709B (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140131750A (ko) * 2013-05-06 2014-11-14 엘지전자 주식회사 원심팬
KR101677030B1 (ko) 2013-05-10 2016-11-17 엘지전자 주식회사 원심팬
US9995311B2 (en) 2013-05-10 2018-06-12 Lg Electronics Inc. Centrifugal fan
JP2016121580A (ja) * 2014-12-24 2016-07-07 ダイキン工業株式会社 遠心型送風機
CN106015090B (zh) * 2016-06-27 2019-03-15 珠海格力电器股份有限公司 一种离心风叶、离心风机及空调设备
CN109958655A (zh) * 2019-04-01 2019-07-02 青岛海尔智能技术研发有限公司 一种离心风机及电器
CN111905540B (zh) * 2020-07-13 2022-05-13 上海盛通时代印刷有限公司 一种印刷工艺中处理废气的方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06118993A (ja) * 1992-10-08 1994-04-28 Kokusai Electric Co Ltd 有声／無声判定回路
JP2007170331A (ja) 2005-12-26 2007-07-05 Daikin Ind Ltd ターボファン及びこれを用いた空気調和機の室内ユニット

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS562498A (en) * 1979-06-18 1981-01-12 Matsushita Electric Ind Co Ltd Electric fan
DE8909594U1 (de) * 1989-08-10 1989-10-05 Metronic Electronic Gmbh, 7210 Rottweil, De
JP3018545B2 (ja) * 1991-04-11 2000-03-13 松下電器産業株式会社 電動送風機
JPH06108993A (ja) * 1992-09-30 1994-04-19 Matsushita Electric Ind Co Ltd 電動送風機のインペラ
EP1455094A1 (de) * 2003-03-04 2004-09-08 Ziehl-Abegg AG Radiallüfterrad
KR100629328B1 (ko) * 2004-02-03 2006-09-29 엘지전자 주식회사 청소기의 송풍장치
TWM287571U (en) * 2005-09-22 2006-02-11 Delta Electronics Inc Centrifugal fan

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06118993A (ja) * 1992-10-08 1994-04-28 Kokusai Electric Co Ltd 有声／無声判定回路
JP2007170331A (ja) 2005-12-26 2007-07-05 Daikin Ind Ltd ターボファン及びこれを用いた空気調和機の室内ユニット

Also Published As

Publication number Publication date
CN102022349A (zh) 2011-04-20
EP2295817A3 (de) 2012-03-14
TWI418709B (zh) 2013-12-11
TW201109532A (en) 2011-03-16
JP2011058442A (ja) 2011-03-24
JP4894900B2 (ja) 2012-03-14
CN201851371U (zh) 2011-06-01

Similar Documents

Publication Publication Date Title
EP2295817A2 (de) Gebläserotor und Gebläse damit
US9157452B2 (en) Radial fan wheel, fan unit and radial fan arrangement
EP1979623B1 (de) Verbessertes laufrad und gebläse
JP5230805B2 (ja) 多翼送風機
JP5783214B2 (ja) 遠心送風機及びこれを備えた空気調和機
EP3085962B1 (de) Bidirektionale axiallüftervorrichtung
JP4867596B2 (ja) 電動送風機およびこれを用いた電気掃除機
JP2008121589A5 (de)
JP6078945B2 (ja) 遠心送風機
JP6611676B2 (ja) 送風機および冷凍サイクル装置の室外機
JP4712714B2 (ja) 遠心式多翼ファン
JP5136604B2 (ja) スクロール付遠心送風機
JPH0448959B2 (de)
KR20090041467A (ko) 송풍팬
JPH01193099A (ja) 遠心送風機の羽根車
JP4872997B2 (ja) 送風機及び該送風機を備えた空気調和機
EP1726832B1 (de) Lüfter und dessen Schaufel
JP6138343B2 (ja) 遠心送風機
JP6771589B2 (ja) 遠心送風機
JP4915791B2 (ja) 遠心式多翼送風機
KR100459191B1 (ko) 터보팬
KR101626488B1 (ko) 원심팬
JPS6122177Y2 (de)
JP2024015654A (ja) 軸流ファン
JPH10196590A (ja) 空気調和機等の送風機

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: A2

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 SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME RS

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

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 SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME RS

RIC1 Information provided on ipc code assigned before grant

Ipc: F04D 29/30 20060101ALI20120208BHEP

Ipc: F04D 29/28 20060101AFI20120208BHEP

17P Request for examination filed

Effective date: 20120913

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20140509

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20140920