EP1790264A2 - Gebläseaggregat für einen Staubsauger - Google Patents

Gebläseaggregat für einen Staubsauger Download PDF

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Publication number
EP1790264A2
EP1790264A2 EP06291181A EP06291181A EP1790264A2 EP 1790264 A2 EP1790264 A2 EP 1790264A2 EP 06291181 A EP06291181 A EP 06291181A EP 06291181 A EP06291181 A EP 06291181A EP 1790264 A2 EP1790264 A2 EP 1790264A2
Authority
EP
European Patent Office
Prior art keywords
diffuser
impeller
entrance
fan assembly
area
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Withdrawn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
EP06291181A
Other languages
English (en)
French (fr)
Inventor
Hyun-Jun Oh
Seung-Gee Hong
Hwa-Gyu Song
Sung-Cheol Lee
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.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Gwangju Electronics 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 Samsung Gwangju Electronics Co Ltd filed Critical Samsung Gwangju Electronics Co Ltd
Publication of EP1790264A2 publication Critical patent/EP1790264A2/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/22—Mountings for motor fan assemblies
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L5/00—Structural features of suction cleaners
    • A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
    • A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F04D29/444—Bladed diffusers
    • 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
    • F04D29/663—Sound attenuation
    • 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
    • F05D2250/50—Inlet or outlet
    • F05D2250/52—Outlet

Definitions

  • the present invention relates to a vacuum cleaner. More particularly, the present invention relates to a fan assembly for a vacuum cleaner.
  • a vacuum cleaner is an apparatus that sucks contaminants with air by suction force, and then, separates and collects contaminants from the sucked air using a contaminants collecting apparatus.
  • An example of the vacuum cleaner is shown in Fig. 1.
  • the vacuum cleaner 1 includes a suction brush 2, an extension pipe assembly 3, and a main body 4.
  • the suction brush 2 is provided with a suction port (not shown) at a bottom surface thereof, and sucks contaminants from a cleaning surface.
  • the extension pipe assembly 3 connects the suction brush 2 with the main body 4 so as to form a pathway through which sucked contaminants are moved.
  • the main body 4 has a contaminant collecting apparatus 6 and a fan assembly 7.
  • the contaminant collecting apparatus 6 separates contaminants from sucked air and collects the separated contaminants.
  • the contaminant collecting apparatus 6 may be implemented by any of a general dust bag or a cyclone dust collecting apparatus or so on.
  • the fan assembly 7 generates the suction force for sucking air and contaminants.
  • the fan assembly 7 includes a motor 9, an impeller (not shown), and a diffuser 8.
  • the impeller is mounted on a rotation shaft of the motor 9.
  • the motor 9 rotates the impeller to generate suction force, sucking air and contaminants.
  • the diffuser 8 guides air being discharged from the impeller to the motor 9 so that the air cools the motor 9 and then is discharged outside through an outlet 5 of the main body 4.
  • the fan assembly 7 generates a loud noise because the impeller rotates at high speed inside the diffuser 8.
  • the impeller has a plurality of blades so that peak noises are generated at BPF (Blade Passing Frequency) and at integer multiply frequencies of the BPF.
  • BPF noises are referred to as BPF noises.
  • the BPF presents the number of blades passing per second measured in cycles per second (Hz).
  • BPF noises do not greatly affect the whole noise level of the vacuum cleaner, but they cause users to feel ill because they are high frequency noises with strong tones.
  • An aspect of the present invention is to provide a fan assembly for a vacuum cleaner to reduce noise, especially BPF noises, generated by an impeller.
  • the above aspect and/or other feature of the present invention can substantially be achieved by providing a fan assembly for a vacuum cleaner, which includes a motor; an impeller having a plurality of impeller blades, the impeller being rotated by the motor to suck air; and a diffuser disposed to wrap around an outer circumference of the impeller, the diffuser having a plurality of diffuser blades arranged in a predetermined interval. A ratio of an exit area of the diffuser to an entrance area of the diffuser is determined to reduce noise generated when the impeller rotates.
  • the ratio of an exit area of the diffuser to an entrance area of the diffuser satisfies a follow formula: 0.51 ⁇ DI DO ⁇ 0.62 where DI is the entrance area of the diffuser, and DO is the exit area of the diffuser.
  • the diffuser is formed to satisfy the formula by controlling the number of the diffuser blades or an inclined angle of each entrance of the plurality of diffuser blades.
  • the fan assembly for the vacuum cleaner according to an embodiment of the present invention as described above can reduce the BPF noises while minimizing the decrease of suction force.
  • the fan assembly for the vacuum cleaner it is easy to control a ratio of the diffuser exit area to the diffuser entrance area by controlling the number of the diffuser blades or an inclined angle of an entrance of the diffuser blade.
  • Fig. I is a view illustrating a conventional vacuum cleaner
  • Fig. 2 is a sectional view illustrating a fan assembly for a vacuum cleaner according to an embodiment of the present invention
  • Fig. 3 is a perspective view illustrating an impeller of the fan assembly in Fig. 2;
  • Fig. 4 is a perspective view illustrating a diffuser of the fan assembly in Fig. 2;
  • Fig. 5 is a plain view illustrating the diffuser of Fig. 4;
  • Fig. 6 is a partial perspective view illustrating a diffusing channel of the diffuser of Fig. 5;
  • Fig. 7 is a partial plain view for explaining changes of a sectional area of an entrance of a diffusing channel according to changes of an inclined angle of an entrance of a diffuser blade;
  • Fig. 8 is a graph illustrating a relationship between suction force of a fan assembly and ratios of a diffuser exit area to a diffuser entrance area;
  • Fig. 9 is a graph illustrating a relationship between BPF noises and ratios of a diffuser exit area to a diffuser entrance area.
  • a fan assembly 40 for a vacuum cleaner includes a motor 10, an impeller 20, and a diffuser 30.
  • the motor 10 rotates the impeller 20, and any of various types of motors, which are generally used in vacuum cleaners, may be used as the motor 10.
  • the motor 10, in general, has a rotation speed range of 30,000 ⁇ 36,000 rpm, and a capacity range of 1,000 ⁇ 2,000W.
  • the impeller 20 is rotated by the motor 10 so as to generate suction force sucking air, and includes an upper plate 22, a lower plate 21, and a plurality of impeller blades 23.
  • the upper plate 22 is formed in a substantially disk shape, and an air inlet 25 is formed at a center of the upper plate 22.
  • the lower plate 21 is formed a disk shape corresponding to the upper plate 22 and a center of the lower plate 21 is fixed to a motor shaft 11.
  • the plurality of impeller blades 23 is radially arranged at a predetermined interval between the upper plate 22 and the lower plate 21. Each of the plurality of impeller blades 23 is bent with a predetermined curvature. Therefore, air entering through the air inlet 25 is discharged outside the impeller 20 through a plurality of air channels formed by the plurality of impeller blades 23.
  • the diffuser 30 guides air discharged from the impeller 20 to the motor 10.
  • the diffuser 30 includes a diffuser plate 32, a plurality of diffuser blades 31, and a plurality of guiding blades 33.
  • the diffuser plate 32 is formed in a substantially disk shape and is disposed between the impeller 20 and the motor 10.
  • the diffuser plate 32 has on a center thereof a boring hole 34 through which the motor shaft 11 passes.
  • the plurality of diffuser blades 31 is disposed on an upper surface of the diffuser plate 32 to wrap around the impeller 20. In other words, the diffuser blades 31 are radially disposed at a predetermined interval on an outer circumference of the diffuser plate 32.
  • a space between neighboring diffuser blades 31 forms a diffusing channel 36.
  • An impeller-side end 3 1b of each of the diffuser blades 31 forms an entrance of the diffusing channel 36.
  • Each of the plurality of diffuser blades 31 is bent with a predetermined curvature as shown in Fig. 5.
  • the plurality of guiding blades 33 is radially disposed at a predetermined interval on an under surface of the diffuser plate 32. A space between neighboring 2 guiding blades 33 forms a guiding channel 37.
  • the plurality of guiding blades 33 is formed to guide air entered from the plurality of diffusing channels 36 to the motor 10.
  • a plurality of openings 35 is formed at each outer end of the diffusing channels 36 on the diffuser plate 32 to fluidly communicate the diffusing channels 36 and the guiding channels 37.
  • Each of the openings 35 covered by an upper cover 15 forms an exit of each of the diffusing channels 36. Therefore, air passing through each of the diffusing channels 36 flows to each of the guiding channels 37 through the plurality of openings 35, and then, is guided to the motor 10.
  • the upper cover 15 covers upper sides of both of the impeller 20 and the diffuser 30 to form a space in which the impeller 20 rotates.
  • the upper cover 15 prevents air discharged from the impeller 20 from leaking out a top end of the diffuser 30.
  • the inventors have determined that noise, especially BPF noises, generated by the impeller 20 rotating inside the plurality of diffuser blades 31 may be decreased while minimizing a decrease of suction force of the fan assembly 40 if the diffuser 30 has a ratio of a diffuser exit area to a diffuser entrance area within a predetermined range. Then, the inventors have, through experimentation, determined the predetermined range of the ratio of the diffuser exit area to the diffuser entrance area that can decrease the BPF noises of the impeller 20 while minimizing the decrease of suction force of the fan assembly 40.
  • the diffuser exit area means an exit area of the diffuser 30, and the diffuser entrance area means an entrance area of the diffuser 30.
  • the diffuser entrance area is computed by multiplying an entrance cross sectional area of one diffusing channel 36 by the number of the diffuser blades 31.
  • the entrance cross sectional area of one diffusing channel 36 is computed by multiplying a height H of the diffuser blade 31 by a length B of a vertical line from an entrance end 31b of the diffuser blade 31 to next diffuser blade 31'.
  • the entrance cross sectional area of one diffusing channel 36 is computed by Formula 1:
  • CI is the entrance cross sectional area of one diffusing channel 36
  • B is a length of a vertical line from an entrance end of the diffuser blade 31 to next diffuser blade 31'
  • H is a height of the diffuser blade 31.
  • DI is the diffuser entrance area
  • CI is the entrance cross sectional area of one diffusing channel 36
  • N is the number of the diffuser blades 31.
  • the diffuser exit area is computed by multiplying an opening area forming an exit of the diffusing channel 36 by the number of the diffuser blades 31. Referring Fig. 5 and 7, the opening 35 of the diffusing channel 36 is formed at an outer circumference of the diffuser plate 32 forming a bottom surface of the diffusing channel 36.
  • DO is the diffuser exit area
  • CO is the opening area of the diffusing channel 36
  • N is the number of the diffuser blades 31.
  • the ratio of the diffuser exit area to the diffuser entrance area is defined as Formula 4:
  • R is the ratio of the diffuser exit area to the diffuser entrance area
  • DI is the diffuser entrance area
  • DO is the diffuser exit area
  • the inventors have measured the changes of suction force and BPF noises corresponding to the changes of the ratio of the diffuser exit area to the diffuser entrance area of the fan assembly 40 for the vacuum cleaner. The results are shown in Table 1, and Figs. 8 and 9.
  • a motor 10 of the fan assembly 40 has a capacity of 1800W, and operates approximately at 31,000 rpm, 230 V, and 50 Hz.
  • a maximum height is 17.4mm
  • a minimum height is 8mm
  • an inner diameter namely, a diameter of the air inlet 25 is 35mm
  • an outer diameter is 109.6mm (see Fig. 3).
  • a height is 23.5mm
  • a height of the diffuser blade 31 is 10mm
  • an outer diameter is 130mm (see Fig. 4).
  • a curve shown in Fig. 8, and four straight lines 1,2,3, and 4 shown in Fig. 9 illustrate the data of Table 1.
  • straight lines 1,2,3, and 4 indicate a first, a second, a third, and a total BPF noise, respectively.
  • a maximum suction force of the fan assembly according to this embodiment is approximately 675W.
  • the diffuser area ratio is 0.51
  • the suction force is approximately 600W.
  • the diffuser area ratio is approximately 0.51 and over.
  • a first, a second, a third, and a total BPF noise 1,2,3, and 4 decrease.
  • a first, a second, a third, and a total BPF noise 1, 2, 3, and 4 increase.
  • the diffuser area ratio is approximately 0.62 and below.
  • the diffuser 30 is formed to have a range of the diffuser area ratio of 0.51 ⁇ 0.62.
  • any one or both of the diffuser exit area and the diffuser entrance area as described above may be controlled so that the diffuser 30 has the substantially same size as the conventional diffuser and the diffuser area ratio may come within the range described above.
  • the diffuser exit area may be constant and the diffuser entrance area is controlled so that the ratio of the diffuser exit area to the diffuser entrance area is controlled.
  • below methods can be used.
  • controlling of the number of the diffuser blades 31 causes the diffuser entrance area to be controlled.
  • the number of the diffuser blades 31 increases, a gap between neighboring 2 diffuser blades 31 narrows thereby the diffuser area ratio decreasing.
  • the diffuser entrance area with respect to the diffuser exit area decreases so that the diffuser area ratio decreases.
  • a gap between neighboring 2 diffuser blades 31 widens thereby the diffuser area ratio increasing.
  • controlling of an inclined angle ⁇ of the entrance of the diffuser blade 31 causes the diffuser entrance area to be controlled.
  • the inclined angle ⁇ of the entrance of the diffuser blade 31 means an angle that an entrance end of the diffuser blade 31 is inclined. Accordingly, the maximum inclined angle of the entrance of the diffuser blade 31 is 90°.
  • the diffuser entrance area is minimum.
  • the inclined angle ⁇ of the entrance of the diffuser blade 31 decreases, the diffuser entrance area increases.
  • the diffuser entrance area is defined as an area of a section 38 of the diffusing channel 36 at a point P where a top end 31a of the diffuser blade 31 meets the inclined entrance end 3 1 b of the diffuser blade 31 (see Fig. 6).
  • Fig. 7 is a plain view for explaining changes of gap dimension between neighboring 2 diffuser blades 31 and 31' corresponding to changes of the inclined angle ⁇ of the entrance of the diffuser blade 31.
  • P is a first point where the top end 31a of the diffuser blade 31 meets the inclined entrance end 31b of the diffuser blade 31 when the inclined angle of the entrance of the diffuser blade is ⁇ as shown in Fig. 6,
  • B is the gap dimension between the 2 diffuser blades 31 and 31' of this case.
  • P 1 is a second point where the top end 31a of the diffuser blade 31 meets the inclined entrance end 31b of the diffuser blade 31 when the inclined angle of the entrance of the diffuser blade 31 is more than ⁇
  • B 1 is the gap dimension between the 2 diffuser blades 31 and 31' of this case.
  • P2 is a third point where the top end 31a of the diffuser blade 31 meets the inclined entrance end 31b of the diffuser blade 31 when the inclined angle of the entrance of the diffuser blade 31 is less than ⁇
  • B2 is the gap dimension between the 2 diffuser blades 31 and 31' of this case.
  • the impeller 20 fixed on the motor shaft 11 Upon rotating the motor 10, the impeller 20 fixed on the motor shaft 11 is rotated. As the impeller 20 rotates, air is sucked in through the air inlet 25, and then, is discharged to the diffuser 30 through the exit of the impeller 20.
  • the air discharged from the impeller 20 is entered into each entrance of the plurality of diffusing channels 36, and then, passes through each of the diffusing channels 36 thereby being discharged to each of the guiding channels 37 through the opening 35 that is an exit of the diffusing channel 36.
  • the ratio of the diffuser exit area to the diffuser entrance area is a range of 0.51 ⁇ 0.62 so that the BPF noises generated by impeller rotation are minimized.
  • the air entered into the guiding channels 37 passes through the motor 10, and then, is discharged outside the main body through an air outlet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP06291181A 2005-11-28 2006-07-20 Gebläseaggregat für einen Staubsauger Withdrawn EP1790264A2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020050114158A KR100721305B1 (ko) 2005-11-28 2005-11-28 진공청소기용 팬 조립체

Publications (1)

Publication Number Publication Date
EP1790264A2 true EP1790264A2 (de) 2007-05-30

Family

ID=37781992

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06291181A Withdrawn EP1790264A2 (de) 2005-11-28 2006-07-20 Gebläseaggregat für einen Staubsauger

Country Status (5)

Country Link
US (1) US20070122277A1 (de)
EP (1) EP1790264A2 (de)
KR (1) KR100721305B1 (de)
CN (1) CN1975175A (de)
AU (1) AU2006203064A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101822505A (zh) * 2009-03-03 2010-09-08 戴森技术有限公司 清洁器械
US9456728B2 (en) 2011-10-13 2016-10-04 Aktiebolaget Electrolux Vacuum cleaner
JP2021055627A (ja) * 2019-09-30 2021-04-08 ダイキン工業株式会社 ターボファン

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JP2011117442A (ja) * 2009-10-28 2011-06-16 Kokuyo Co Ltd 送風機
US20110265285A1 (en) * 2010-04-30 2011-11-03 Morgan Charles J Upright vacuum with reduced noise
US8528166B2 (en) 2010-04-30 2013-09-10 Techtronic Floor Care Technology Limited Upright vacuum with floating head
CN101846087B (zh) * 2010-05-11 2011-09-14 东元总合科技（杭州）有限公司 离心风扇及设有该离心风扇的密闭式电机
JP5544318B2 (ja) * 2011-03-01 2014-07-09 日立アプライアンス株式会社 電動送風機及びそれを搭載した電気掃除機
DE112012003045B4 (de) * 2011-07-07 2024-01-04 Makita Corporation Kraftwerkzeug
FR2979814B1 (fr) * 2011-09-12 2013-08-23 Seb Sa Aspirateur comportant un silencieux et un diffuseur d'air
CN103126611A (zh) * 2011-11-30 2013-06-05 乐金电子(天津)电器有限公司 减小噪音的吸尘器风扇扩散器结构
CN103321922B (zh) * 2012-03-22 2016-11-23 德昌电机(深圳)有限公司 风机及具有该风机的真空吸尘器和干手机
US11073165B2 (en) 2013-12-23 2021-07-27 Fisher & Paykel Healthcare Limited Blower for breathing apparatus
US20160369819A1 (en) * 2014-07-31 2016-12-22 Gentherm Incorporated Air mover inlet interface and cover
JP2016112523A (ja) * 2014-12-16 2016-06-23 株式会社マキタ 送風作業機
CN106468286A (zh) * 2015-08-19 2017-03-01 德昌电机(深圳)有限公司 风机及其扩散器
CN106468288A (zh) * 2015-08-21 2017-03-01 德昌电机(深圳)有限公司 扩散器、气流产生装置及吸尘器、干手机、吹风机
CN107061320B (zh) * 2017-03-13 2019-04-02 美的集团股份有限公司 电风机和具有其的吸尘器
KR102382057B1 (ko) 2017-08-09 2022-04-04 삼성전자주식회사 흡입 모터 및 이를 구비한 진공청소기
CN108397389A (zh) * 2018-03-15 2018-08-14 潘晓江 一种真空泵及其多级真空泵
JP7365987B2 (ja) * 2020-09-30 2023-10-20 日立グローバルライフソリューションズ株式会社 送風機およびこれを備えた洗濯機

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101822505A (zh) * 2009-03-03 2010-09-08 戴森技术有限公司 清洁器械
WO2010100447A1 (en) * 2009-03-03 2010-09-10 Dyson Technology Limited Cleaning appliance
US8397344B2 (en) 2009-03-03 2013-03-19 Dyson Technology Limited Cleaning appliance
US9456728B2 (en) 2011-10-13 2016-10-04 Aktiebolaget Electrolux Vacuum cleaner
JP2021055627A (ja) * 2019-09-30 2021-04-08 ダイキン工業株式会社 ターボファン
WO2021065674A1 (ja) * 2019-09-30 2021-04-08 ダイキン工業株式会社 ターボファン

Also Published As

Publication number Publication date
KR100721305B1 (ko) 2007-05-28
CN1975175A (zh) 2007-06-06
US20070122277A1 (en) 2007-05-31
AU2006203064A1 (en) 2007-06-14

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