WO1997019629A1 - Ventilateur pour un aspirateur - Google Patents

Ventilateur pour un aspirateur Download PDF

Info

Publication number
WO1997019629A1
WO1997019629A1 PCT/DK1996/000486 DK9600486W WO9719629A1 WO 1997019629 A1 WO1997019629 A1 WO 1997019629A1 DK 9600486 W DK9600486 W DK 9600486W WO 9719629 A1 WO9719629 A1 WO 9719629A1
Authority
WO
WIPO (PCT)
Prior art keywords
blower
diffuser
blower wheel
flow
vacuum cleaner
Prior art date
Application number
PCT/DK1996/000486
Other languages
English (en)
Inventor
Tommy Andersen
Original Assignee
Nilfisk A/S
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 Nilfisk A/S filed Critical Nilfisk A/S
Priority to AU76911/96A priority Critical patent/AU7691196A/en
Publication of WO1997019629A1 publication Critical patent/WO1997019629A1/fr

Links

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
    • F04D29/40—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
    • 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
    • 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
    • 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

  • blowers for use m suction cleaners such as vacuum cleaners, and which are herein designated blowers for a vacuum cleaner, comprising a blower wheel and a motor arranged for rotating the blower wheel about its axis of symmetry, and a diffuser extending radially beyond the outer periphery of the blower wheel, and wherein the diffuser has guide surfaces that form diffuser flow passages which define the flow direction for the air conveyed through the diffuser from the blower wheel, which flow direction being anywhere m the diffuser flow passage definable by velocity components m the radial, axial and tangential directions, respectively, relative to the axis of rotation of the blower.
  • blowers for vacuum cleaners are known today i.a. from EP-A1-467 557 wherein the blower wheel conventionally serves to accelerate the air velocity to a maximum velocity and thus kinetic energy at the periphery of the blower wheel, and wherein a diffuser is provided beyond the periphery of the blower wheel, which diffuser extends substantially perpendicular to the axis of rotation of the blower wheel, and subsequently serves to convert the kinetic energy of the air (velocity energy) at the inlet openings of the diffuser to potential energy (gas pressure) at the outlet openings of the diffuser by the flow of air flowing through diffuser flow passages having evenly increasing cross sectional areas.
  • the blower wheel conventionally serves to accelerate the air velocity to a maximum velocity and thus kinetic energy at the periphery of the blower wheel
  • a diffuser is provided beyond the periphery of the blower wheel, which diffuser extends substantially perpendicular to the axis of rotation of the blower wheel, and subsequently serves to convert the kinetic
  • the diffuser is an important unit as it enables the conversion of kinetic energy into potential energy to take place without substantial flow losses compared to blower constructions where no diffusers are used but exclusively guide passages without or with only a small diffuser performance. Since the performance of the diffuser flow passages is increased, ceteris paribus, as the length of the diffuser flow passages increases relative to the difference in area of the inlet and outlet openings, it is obvious that the person skilled in the art may, according to given installation conditions, choose to give priority to a large blower wheel diameter or relatively long diffuser flow passages. Most often this choice will, ceteris paribus, be in favour of the blower wheel with the result that today the diffusers m blowers for a vacuum cleaner have relatively low performances, typically below 50 ⁇ .
  • the vacuum cleaner blower is provided in accordance with the features described m the characterising portion of claim 1 whereby the diffuser flow passages formed by the guide surfaces are caused to deflect in such a manner that they convey the flow of air in such a manner that the velocity component of the flow in the axial direction relative to the velocity component m the radial direction at the outlet opening exceeds the velocity at the inlet opening.
  • the diffuser flow passages formed by the guide surfaces are caused to deflect in such a manner that they convey the flow of air in such a manner that the velocity component of the flow in the axial direction relative to the velocity component m the radial direction at the outlet opening exceeds the velocity at the inlet opening.
  • the guide surfaces which constitute each of the diffuser flow passages are provided in such a manner that the radial velocity component of the flow substantially equals zero at the outlet opening of the diffuser flow passages.
  • the diffuser flow passages may in a simple manner be caused to debouch into a chamber below the blower wheel without necessitating that the outer diameter of the vacuum cleaner blower has to be substantially larger than the outer diameter of the diffuser.
  • the diffuser may be provided m an extremely production-friendly manner of a plastics material in an injection-moulding process.
  • the vacuum cleaner blower is provided in such a manner that the guide surfaces which form each of the diffuser flow passages are so provided that the velocity components of the flow at the inlet opening substantially correspond to the velocity components of the flow at the periphery of the blower wheel.
  • the performance may also be increased by the diffuser flow passages between the inlet opening and the outlet opening being m the form of continuously extending passage deflections.
  • the advantages of the invention are significant in connection with blowers for a vacuum cleaner which are operated by blower wheels that rotate with a speed of rotation which is relatively low for blowers for a vacuum cleaner but wherein the blower wheel has a relatively large outer diameter due to the relatively low speed of rotation.
  • blower wheels that comprise to substantially disc-shaped guide surfaces which are spaced apart by means of blower blades, and wherein the guide surfaces have an outer diameter which forms the periphery of the blower wheel and said diameter exceeding 140 mm and being less than 160 mm, and that the distance between the disc-shaped guide surfaces at the periphery of the blower wheel exceeds 2, 5 mm and is less than 4 mm, preferably 3 mm.
  • the distance between the guide surfaces which delimit the diffuser flow passages in the same direction as the disc-shaped guide surfaces of the blower wheel substantially equals the distance between the disc-shaped guide surfaces of the blower wheel .
  • the inlet openings of the diffuser flow passages are arranged at a distance from the periphery of the blower wheel which exceeds 5 mm.
  • the noise which may be generated m the area between the guide surfaces which form the diffuser flow passages and the blower wheel may be reduced without significantly influencing the efficiency of the blower.
  • Figure 1 is a sectional view through a vacuum cleaner blower according to the invention.
  • Figure 2 is a side view of a preferred embodiment of a diffuser element for the vacuum cleaner blower according to Figure 1.
  • Figure 3 is a top plan view of the diffuser element according to Figure 2.
  • Figure 4 is a side view of a preferred embodiment of a blower wheel for the vacuum cleaner blower according to Figure 1.
  • Figure 5 is a top plan view of the blower wheel according to Figure 4.
  • FIG. 1 illustrates a preferred embodiment of a vacuum cleaner blower 1 according to the invention.
  • the vacuum cleaner blower has a motor 2 which is an electro ⁇ motor with a commutator 4 herein which is powered in a conventional manner with current from a number of coals 5 of which only one is illustrated herein.
  • the motor 2 comprises an armature 6 which may rotate about a shaft 13.
  • electro-motors of this type for blowers for a vacuum cleaner operate within the range of from 18000 rpm to 28000 rpm.
  • the present invention is particularly suitable for use in connection with motors that operate within this interval, but of course it may also lend itself for use in connection with other types of motors, such as motors which may operate at an rpm which is outside the range defined above.
  • blower housing is arranged having a suction opening 9 which, in a known manner in e.g. a vacuum cleaner, debouches in the dust collecting chamber of the vacuum cleaner.
  • a suction opening 9 which, in a known manner in e.g. a vacuum cleaner, debouches in the dust collecting chamber of the vacuum cleaner.
  • the present invention being m principle suitable for any type of vacuum cleaner, this is not exemplified m the drawings.
  • a blower wheel 7 is mounted as will be described in further detail with reference to Figures 4 and 5 but which serves to draw in air via the suction opening 9 and to accelerate this air to obtain maximum velocity at the periphery of the blower wheel 7.
  • blower housing 3 is provided m a manner known per se with a diffuser 8 arranged around the blower wheel 7, which diffuser will be subject to more detailed description with reference to Figures 2 and 3 but having in a known manner a number of diffuser passages 14 which each has an inlet opening opposite the periphery of the blower wheel 7, and an outlet opening which debouches in a chamber 10 arranged m the blower housing 3 whereby the diffuser passages 14 are caused to convey the air flung from the blower wheel 7 at high velocity into the chamber 10 of the blower housing 3.
  • the individual diffuser passages 14 have a cross sectional area which is smallest at the inlet opening and largest at the outlet opening which means that the air which flows into the passage at high velocity (kinetic energy) is caused to flow out of the passage at a relatively lower velocity (kinetic energy) but at an increased gas pressure (potential energy) .
  • an elevated gas pressure is generated in the gas chamber 14 compared to the suction opening 9 whereby the air is allowed to be pressed out of the chamber 14 substantially without any loss and further on through the suction cleaner.
  • the air is drawn via passages 11 through the motor 2 and thus cools the latter following which it conveyed away from the motor 2 via passages 12.
  • the invention lends itself for use in connection with e.g. wet suction machines wherein it is desired to eliminate the risk that the motor is flushed by humid air or fluid, which is why they are provided with a separate cooling blower for cooling the motor, and thus m this situation it is possible that the flow of air from the chamber 10 avoids the motor 2 completely.
  • the diffuser 8 will now be described m detail with reference to Figures 2 and 3 which illustrate the diffuser 8 seen from the side and from the top from that side to which the blower wheel is arranged m Figure 1, respectively.
  • the diffuser 8 has a central opening for receiving the shaft 13 of the motor 2 as shown in Figure 1.
  • it has a partition wall 16 serving to divide the blower housing 3 into two chambers, viz. a first chamber in which the blower wheel is arranged as shown m Figure 1 and the chamber 14.
  • the periphery of the diffuser 8 is provided with diffuser flow passages 14, since here the diffuser is provided with a number of guide surfaces 1 / which extend in the area between the lower guide surface 18 and the blower housing 3, whereby the diffuser flow passages 14 are substantially separated from each other whereby the guide surfaces 17 and 18 of the diffuser 8 form the diffuser flow passages 14 in combination with the blower housing 3.
  • the diffuser 8 in combination with the blower housing 3 form the diffuser flow passages 14 extending at the periphery of the blower wheel 7 substantially m the plane of the blower wheel 7 outwards relative to the axis of rotation or symmetry of the blower wheel, which is defined by the shaft 13 on the motor 2.
  • the diffuser flow passages 14 convey the air in such direction and at such velocity which may m essence be defined by a radial and tangential velocity component, the axial velocity component being extremely small or zero.
  • the diffuser flow passages 14 are so designed that the air is conveyed into the chamber 10 at such velocity and m such direction which are primarily defined by an axial and a tangential component of direction, the radial component of velocity at the outlet being extremely small or zero.
  • the diffuser flow passages 14 are deflected into a three-dimensional passage deflection that consists of smooth continuously extending surfaces 17,18 for flow considerations, said surfaces having no abrupt bends which may result m flow losses.
  • this three-dimensional shape of the passage enables use of a blower wheel 7 with a relatively large outer diameter compared to known constructions without necessitating that the blower housing 3 should have a correspondingly increased diameter m order to make room for the known diffuser passages which provide only a diffuser effect. Moreover it is possible to let the diffuser flow passages 14 convey the air to the chamber 10 substantially without losses.
  • blower wheel 7 illustrates the blower wheel 7 seen from the suction opening 9.
  • the blower wheel 7 has a central mounting site 19 for attachment of the blower wheel 7 to the shaft 13 of the motor (2) as shown m Figure 1.
  • the blower wheel has a lower unit 20 which is preferably made in an injection moulding process, m particular a plastics injection moulding process wherein, of course, the lower unit is made of plastics .
  • the lower unit 20 on the blower wheel 7 may thus be made with a very high degree of freedom, thus allowing blower blades 21 to be arranged in a simple manner and which extend in a conventional manner m radii originating in the suction opening end extending to the periphery of the blower wheel 7.
  • a cover plate 22 is subsequently attached in selected receiving points 23, which cover plate is preferably made of metal.
  • the cover plate 22 will hereby brace the relatively flexible lower unit 20 which will, as stated above, be made of plastics. In this way maximum advantage is taken of the properties of the plastics and the metal to form a light but strong blower wheel 7. This advantage is further supported by the preferred embodiment shown wherein the cover plate 22 is made as a conical surface which will thereby further brace the lower unit 20.
  • blower wheel 7 as well as diffuser 8 are configured to be optimum from a flow point of view, and therefore the preferred embodiment shown in Figures 1 through 5 will be described in further detail m the following with regard to the design of the blower wheel 7 and the diffuser 8.
  • the inlet opening 9 on the blower wheel 7 has a diameter of 43 mm and an outer diameter of 150 mm.
  • the outlet angle of the blower blades 21 at the outer periphery of the blower wheel 7 is 30° in the embodiment shown relative to the tangent at the same point on the periphery.
  • the passage height on the diffuser flow passages 14 equals or slightly exceeds the distance between the cover plate 22 and the lower unit 20 in the blower wheel, i.e. about 3 mm.
  • the diffuser passages 14 will be optimum at an inlet angle of 15° relative to the corresponding tangent direction.
  • the embodiment shown is optimum since, despite the lower rpm, the large outer diameter of the blower wheel 7 results m a large peripheral velocity for the air leaving the blower wheel and is urged into the diffuser, and thus in a high gas pressure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L'invention concerne un ventilateur (1) pour un aspirateur, ayant une roue (7) de ventilateur, un moteur (2) prévu pour tourner la roue (7) autour de son axe de symétrie (13) et un diffuseur (8) s'étendant radialement au-delà de la périphérie externe de la roue (7) du ventilateur, où le diffuseur (8) a des surfaces de guidage (17, 18) qui forment des passages de diffusion (14) définissant la direction du flux de l'air transporté à travers le diffuseur (8) depuis la roue (7) du ventilateur, ladite direction du flux étant définie n'importe où dans le passage (14) du diffuseur par les composantes de vitesse, respectivement dans les directions radiale, axiale et tangentielle, par rapport à l'axe de rotation (13) du ventilateur (7). Les passages (14) du diffuseur selon l'invention sont formés par les surfaces de guidage (17, 18) réalisées de manière à diriger le flux d'air pour que la composante de vitesse du flux dans la direction axiale, par rapport à la composante de vitesse dans la direction radiale, soit plus élevée à l'ouverture de sortie du passage (14) du diffuseur qu'à l'ouverture d'entrée. Ceci permet, pour un appareil de dimensions données, d'avoir un diffuseur plus efficace, tout en permettant à la roue du ventilateur d'avoir une périphérie externe relativement importante.
PCT/DK1996/000486 1995-11-24 1996-11-22 Ventilateur pour un aspirateur WO1997019629A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU76911/96A AU7691196A (en) 1995-11-24 1996-11-22 A blower for a vacuum cleaner

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK1327/95 1995-11-24
DK132795 1995-11-24

Publications (1)

Publication Number Publication Date
WO1997019629A1 true WO1997019629A1 (fr) 1997-06-05

Family

ID=8103618

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1996/000486 WO1997019629A1 (fr) 1995-11-24 1996-11-22 Ventilateur pour un aspirateur

Country Status (2)

Country Link
AU (1) AU7691196A (fr)
WO (1) WO1997019629A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0890745A2 (fr) * 1997-07-11 1999-01-13 Hitachi, Ltd. Soufflante entraínée par moteur et procédé de fabrication de la roue pour soufflante entrainée par moteur
EP1079114A1 (fr) * 1998-05-13 2001-02-28 Matsushita Electric Industrial Co., Ltd. Soufflante electrique et aspirateur comportant ladite soufflante
WO2002006676A1 (fr) * 2000-07-14 2002-01-24 Pratt & Whitney Canada Corp. Diffuseur a buse integree
EP1400699A2 (fr) * 2002-09-20 2004-03-24 Matsushita Electric Industrial Co., Ltd. Soufflante électrique et aspirateur muni d'une telle soufflante
EP1627590A2 (fr) * 2004-08-13 2006-02-22 LG Electronics, Inc. Soufflante centrifuge et aspirateur comportant une telle soufflante centrifuge
US20120138058A1 (en) * 2009-08-11 2012-06-07 Timothy Tsun-Fai Fu Single stage, axial symmetric blower and portable ventilator
EP3133295A1 (fr) * 2015-08-21 2017-02-22 Johnson Electric S.A. Diffuseur, appareil de génération d'écoulement d'air et dispositif électrique
EP3133294A1 (fr) * 2015-08-19 2017-02-22 Johnson Electric S.A. Ventilateur, diffuseur et aspirateur l'utilisant
EP2378132A4 (fr) * 2009-02-06 2018-01-17 Panasonic Corporation Soufflante electrique et aspirateur electrique le mettant en oeuvre
EP3462039A4 (fr) * 2017-03-13 2019-06-12 Midea Group Co., Ltd. Ventilateur électrique et aspirateur comprenant celui-ci
US11998690B2 (en) 2020-11-03 2024-06-04 Resmed Motor Technologies Inc. Single stage, axial symmetric blower and portable ventilator

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791772A (en) * 1970-10-03 1974-02-12 Philips Corp Vacuum cleaner fan assembly
EP0467557A1 (fr) * 1990-07-20 1992-01-22 Hitachi, Ltd. Soufflante d'aspirateur avec roue de ventilateur
EP0556895A1 (fr) * 1992-02-17 1993-08-25 Koninklijke Philips Electronics N.V. Dispositif de déplacement d'un milieu gazeux ou liquide et aspirateur muni d'un tel dispositif

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791772A (en) * 1970-10-03 1974-02-12 Philips Corp Vacuum cleaner fan assembly
EP0467557A1 (fr) * 1990-07-20 1992-01-22 Hitachi, Ltd. Soufflante d'aspirateur avec roue de ventilateur
EP0556895A1 (fr) * 1992-02-17 1993-08-25 Koninklijke Philips Electronics N.V. Dispositif de déplacement d'un milieu gazeux ou liquide et aspirateur muni d'un tel dispositif

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0890745A2 (fr) * 1997-07-11 1999-01-13 Hitachi, Ltd. Soufflante entraínée par moteur et procédé de fabrication de la roue pour soufflante entrainée par moteur
EP0890745A3 (fr) * 1997-07-11 1999-02-03 Hitachi, Ltd. Soufflante entraínée par moteur et procédé de fabrication de la roue pour soufflante entrainée par moteur
EP1079114A1 (fr) * 1998-05-13 2001-02-28 Matsushita Electric Industrial Co., Ltd. Soufflante electrique et aspirateur comportant ladite soufflante
EP1079114A4 (fr) * 1998-05-13 2005-04-13 Matsushita Electric Ind Co Ltd Soufflante electrique et aspirateur comportant ladite soufflante
WO2002006676A1 (fr) * 2000-07-14 2002-01-24 Pratt & Whitney Canada Corp. Diffuseur a buse integree
EP1400699A2 (fr) * 2002-09-20 2004-03-24 Matsushita Electric Industrial Co., Ltd. Soufflante électrique et aspirateur muni d'une telle soufflante
EP1400699A3 (fr) * 2002-09-20 2005-10-05 Matsushita Electric Industrial Co., Ltd. Soufflante électrique et aspirateur muni d'une telle soufflante
CN1311167C (zh) * 2002-09-20 2007-04-18 松下电器产业株式会社 电动风机及使用该风机的电动吸尘器
US7416384B2 (en) 2002-09-20 2008-08-26 Matsushita Electric Industrial Co., Ltd. Electric blower and vacuum cleaner using same
EP1627590A2 (fr) * 2004-08-13 2006-02-22 LG Electronics, Inc. Soufflante centrifuge et aspirateur comportant une telle soufflante centrifuge
EP1627590A3 (fr) * 2004-08-13 2006-06-21 LG Electronics, Inc. Soufflante centrifuge et aspirateur comportant une telle soufflante centrifuge
EP2378132A4 (fr) * 2009-02-06 2018-01-17 Panasonic Corporation Soufflante electrique et aspirateur electrique le mettant en oeuvre
EP2464404A1 (fr) * 2009-08-11 2012-06-20 ResMed Motor Technologies Inc. Ventilateur à symétrie axiale, à un seul étage, et ventilateur portable
EP2464404A4 (fr) * 2009-08-11 2014-08-13 Resmed Motor Technologies Inc Ventilateur à symétrie axiale, à un seul étage, et ventilateur portable
EP4059553A1 (fr) * 2009-08-11 2022-09-21 ResMed Motor Technologies Inc. Système de ventilateur modulaire
CN114099876A (zh) * 2009-08-11 2022-03-01 瑞思迈发动机及马达技术股份有限公司 单级轴对称鼓风机和便携式通风机
US9861774B2 (en) 2009-08-11 2018-01-09 Resmed Motor Technologies Inc. Single stage, axial symmetric blower and portable ventilator
US20120138058A1 (en) * 2009-08-11 2012-06-07 Timothy Tsun-Fai Fu Single stage, axial symmetric blower and portable ventilator
US10874810B2 (en) 2009-08-11 2020-12-29 Resmed Motor Technologies Inc. Single stage, axial symmetric blower and portable ventilator
US10598189B2 (en) 2015-08-19 2020-03-24 Johnson Electric International AG Fan, diffuser, and vacuum cleaner having the same
EP3133294A1 (fr) * 2015-08-19 2017-02-22 Johnson Electric S.A. Ventilateur, diffuseur et aspirateur l'utilisant
US10605264B2 (en) 2015-08-21 2020-03-31 Johnson Electric International AG Diffuser, airflow generating apparatus, and electrical device
EP3133295A1 (fr) * 2015-08-21 2017-02-22 Johnson Electric S.A. Diffuseur, appareil de génération d'écoulement d'air et dispositif électrique
EP3462039A4 (fr) * 2017-03-13 2019-06-12 Midea Group Co., Ltd. Ventilateur électrique et aspirateur comprenant celui-ci
US11116367B2 (en) 2017-03-13 2021-09-14 Midea Group Co., Ltd. Electric fan and vacuum cleaner having same
US11998690B2 (en) 2020-11-03 2024-06-04 Resmed Motor Technologies Inc. Single stage, axial symmetric blower and portable ventilator

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Publication number Publication date
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