EP2000070B1 - Motor blower and electric vacuum cleaner using same - Google Patents

Motor blower and electric vacuum cleaner using same Download PDF

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Publication number
EP2000070B1
EP2000070B1 EP08251979A EP08251979A EP2000070B1 EP 2000070 B1 EP2000070 B1 EP 2000070B1 EP 08251979 A EP08251979 A EP 08251979A EP 08251979 A EP08251979 A EP 08251979A EP 2000070 B1 EP2000070 B1 EP 2000070B1
Authority
EP
European Patent Office
Prior art keywords
blower
motor
diffuser
side plate
vacuum cleaner
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.)
Ceased
Application number
EP08251979A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2000070A3 (en
EP2000070A2 (en
Inventor
Go c/o Intellectual Property Division Oshikiri
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.)
Toshiba Corp
Toshiba Lifestyle Products and Services Corp
Original Assignee
Toshiba Corp
Toshiba Consumer Electronics Holdings Corp
Toshiba Home Appliances 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 Toshiba Corp, Toshiba Consumer Electronics Holdings Corp, Toshiba Home Appliances Corp filed Critical Toshiba Corp
Publication of EP2000070A2 publication Critical patent/EP2000070A2/en
Publication of EP2000070A3 publication Critical patent/EP2000070A3/en
Application granted granted Critical
Publication of EP2000070B1 publication Critical patent/EP2000070B1/en
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
    • 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
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • 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
    • F04D29/26—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
    • 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
    • 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
    • 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
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes

Definitions

  • the present invention relates to a motor blower (electric motor-driven blower or motor fan) having an improved blower blade shape and an electric vacuum cleaner using the motor blower.
  • an electric vacuum cleaner includes a motor blower and a dust collecting means both being accommodated in a vacuum cleaner body.
  • the electric vacuum cleaner sucks dust accumulated on a surface to be swept together with air by sucking force of the electric motor blower, and the sucked air and the dust are separated at the dust collecting means.
  • the separated dust is accumulated in the dust collecting means, and the clean air from which the dust is separated is then discharged outside the cleaner body.
  • the motor blower includes an electric motor and a blower member rotated by the electric motor.
  • a centrifugal type blower is used as such blower member, and the motor blower is provided with a diffuser for uniformly regulating a flow of the air discharged from the centrifugal blower.
  • the motor blower used for the electric vacuum cleaner has been demanded to reduce noise for protecting user from undesired noise.
  • centrifugal blower 51 As one countermeasure for reducing the noise, there has been proposed a centrifugal blower 51, as shown in Fig. 11 , in which a blower blade 52 is configured to have an outer diameter smaller than that of a blower plate 53.
  • the centrifugal blower of this type is excellent in audibility under normal operating conditions.
  • the blower blade has the same outer diameter as that of the blower plate, there has been posed a problem such that the proposed centrifugal blower 51 generates undesired noises in an operating conditions of low rate and high frequency region.
  • Patent Document 1 Japanese Patent Application, Laid-open Publication No. 2002-115698 .
  • the present invention has been made in consideration of the circumstances encountered in the prior art as mentioned above, and an object of the present invention is to provide a motor blower and an electric vacuum cleaner using the motor blower capable of suppressing or reducing a generation of abnormal noise even if the vacuum cleaner is operated under conditions of low airflow rate and high frequency region.
  • the present invention provides a motor blower which comprises a motor blower comprising an electric motor having a rotating shaft; a centrifugal blower having a plurality of blower blades separately disposed between a pair of opposing plates, the centrifugal blower being attached to the rotating shaft of the electric motor, and the pair of opposing plates comprising a front side plate on an air inlet side and a rear side plate, wherein the front side plate and the rear side plate have equal diameters; and a diffuser having a plurality of first diffuser blades each of which is positioned at an outer peripheral portion of the centrifugal blower so as to oppose to air outlet ports (35) formed to a circumferential surface of the centrifugal blower, characterized in that each of the blower blades has a radially outward end which is formed to linearly incline from one side end portion of the blower blade located radially inwards of an outer edge of the front side plate toward another side end portion thereof located radially inwards
  • an electric vacuum cleaner comprising a vacuum cleaner body and a motor blower accommodated in the vacuum cleaner body, the motor blower having a structure mentioned above.
  • a motor blower capable of suppressing or reducing a generation of abnormal noise during the operation thereof.
  • an electric vacuum cleaner provided with such a motor blower to thereby suppress or reduce the generation of abnormal noise even if the cleaner is operated under the conditions of low airflow rate and high frequency region.
  • FIG. 1 is a side view, partially in section, showing a structure of a motor blower according to the present invention.
  • the motor blower 1 includes a centrifugal blower or fan 2 formed of metal, an electric motor 4 for rotating the centrifugal blower 2 through a rotating shaft 3, and a case 5 for accommodating the centrifugal blower 2 and the electric motor 4 together with associated members, if any.
  • the case 5 includes a blower cover 6 for covering the centrifugal blower 2, and a motor housing 7 for accommodating the electric motor 4.
  • the motor housing 7 has a bottomed structure having a bottom portion formed by a rear plate 11, and the blower cover side of the motor housing 7 is opened as an opening 12 through which the electric motor 4 is accommodated in the motor housing 7.
  • a central portion of the rear plate 11 provided to a rear surface side of the motor housing 7 in an axial direction is protruded rearward in a shape of a cylinder so as to form a bearing-storage portion 12b in which a bearing 12a is accommodated.
  • a frame 8 is attached to the opening 12 of the motor housing 7 by means of screws 14 so as to be normal to the rotation shaft 3 of the motor 4.
  • the frame 8 has a bridge-shaped structure having a plurality of element extending radially from the rotation shaft 3 of the motor.
  • An inner peripheral side lower end portion of the blower cover 6 is integrated with the motor housing 7 to thereby form the motor blower case 5.
  • inner peripheral portions of the motor housing 7, the frame 8 and the blower cover 6 may be set so as to have the same dimension.
  • the flame 8 is forwardly protruded at its almost central portion in a shape of cylinder so as to form a bearing-storage portion 13b having an opening as a through hole, not shown, through which the rotation shaft 3 penetrates.
  • the bearing 13a is accommodated into the bearing-storage portion 13b.
  • the centrifugal blower 2 and the diffuser 21 are covered with the blower cover 6.
  • the blower cover 6 is provided, at a central portion of a front surface thereof, with an inlet opening 6a opposing to an air-inlet port 31 of the centrifugal blower 2, while at an entire rear surface of the blower cover 6 is formed with a rear opening portion, not shown, so as to provide a substantially cylindrical shape in its entire configuration.
  • the motor 4 is composed of a stator 15 fixed to the motor housing and a rotor 16 provided inside of this stator 15. Both end portions of the rotation shaft 3 of the rotor 16 are rotatably supported by bearings 12a and 13a.
  • a blowout nozzle, not shown, as an exhaust port, is opened at a peripheral surface close to the rear surface of the motor housing 7 directed in a radial direction.
  • the diffuser 21 is fixed to a suction front side of the frame 8.
  • the diffuser 21 includes: a circular plate 22 having a substantially disc shape; a through hole 23 formed at a center of the circular plate 22 through which the rotation shaft 3 penetrates; screw holes 24a and 24b for inserting screws to fix the diffuser 21 to the frame 8; a plurality of circular-arc-shaped blades 25 provided in a vertical direction at a portion close to an outer peripheral portion of the diffuser 21 so that the plurality of blades 25 are positioned at an outer peripheral portion of the blower 2; and a plurality of circular-arc-shaped blades 26 provided in a vertical direction at a rear surface of the circular plate 22, each of the plurality of blades 26 are formed in a spiral shape.
  • the diffuser 21 is inserted into an outer peripheral portion of the bearing storage portion 13b formed to the frame 8 so as to oppose to the frame 8, and the diffuser 21 is then fixed to the frame 8 by the means of screws.
  • the centrifugal blower 2 includes a front side plate 32 provided to a side of an air inlet portion 31, and a plurality of blower blades 34.
  • the blower blades 34 are provided to a portion between the front side plate 32 on the air suction port 31 side and a rear side plate 33 having the same diameter as that of the front side plate 32 and disposed so as to oppose thereto.
  • the blower blade 34 is provided with a plurality of mount projections 34a.
  • the mount projections 34a are inserted into the mount holes 32a and 33a, and then the mount projections 34a are caulked. As a result, each of the blower blades 34 is fixed in a state that the blower blade 34 is sandwiched between the front side plate 32 and the rear side plate 33.
  • the air inlet port 31 is formed at a central portion of the front side plate 32, while an air outlet port 35 is formed at a portion between the and outer peripheral end portions 32b and 33b of the front side plate 32 and the rear side plate 33.
  • one side end portion 34b1 is positioned at an inner side (blower axial center side) of an outer peripheral edge portion 32b of the front side plate 32, while the other side end portion 34b2 is positioned at an inner side of an outer peripheral edge portion 33b of the rear side plate 33. That is, the front end portion 34b of the blower blade 34 is linearly inclined from one side end portion 34b 1 to the other side end portion 34b2 so that the other side end portion 34b2 is positioned at a portion deviated from one side end portion 34b1 to the blower axial center side.
  • d ⁇ 1 d ⁇ 2 , d ⁇ 1 > d ⁇ 3 , d ⁇ 3 > d ⁇ 4
  • the shape of the front end portion 34b of the blower blade 34 is not limited to a straight-line shape as disclosed in the present embodiment.
  • There can be also adopted other shapes such as a curved-line shape, a shape combined a curved-line shape with a straight-line shape, a shape combined a straight-line shape with another straight-line shape as far as the combined shape constitutes an almost linear line shape.
  • the centrifugal blower 2 when the rotation shaft 3 is rotated, the centrifugal blower 2 is also rotated to thereby suck the air.
  • the sucked air passes from the air inlet opening 6a formed to a front surface side of the blower cover 6, and blown out from the air outlet portion 35 through the centrifugal blower 2.
  • the air passes through portions between the circular-arc shaped blades 25 along an inner peripheral surface of the blower cover 6 and flows so as to spread in an axial direction. Further, in a rear surface of the circular plate portion 22, this air passes through portions between the circular-arc- shaped blades 26 toward the center of the diffuser 21 in an eddy current shape.
  • the air blown out from the air outlet port 35 of the centrifugal blower 2 is uniformly rectified and then introduced to the motor 4 by the diffuser 21. After the air introduced to the motor 4 cools the motor 4, the air is discharged outside of the motor housing 7.
  • a noise level of the motor blower of this embodiment can be lowered in comparison with that of the conventional motor blower in which an outer diameter of the blower blade is set to the same as that of the blower plate, and an operation of the motor blower of this embodiment can be performed in a calm and quiet manner.
  • the noise level of the motor blower of this embodiment can be lowered in comparison with that of the conventional motor blower in which the outer diameter of the blower blade is set to the same as that of the blower plate, and the operation of the motor blower of this embodiment can be also performed in a calm and quiet manner.
  • the front end portion 34b of the blower blade 34 is formed so as to linearly incline from the one side end portion 34b 1 to the other side end portion 34b2, there can be provided a motor blower capable of reducing a generation of abnormal noise even under operational conditions of low airflow rate and high frequency region, whereby the motor blower can be manufactured at a low cost with excellent mass- productivity.
  • the motor blower of the present embodiment it becomes possible to suppress or reduce generation of abnormal noise even if the cleaner is operated under the conditions of the low airflow rate and the high frequency region.
  • the motor blower 1 of the present invention is assembled into a cleaner body 42 of a vacuum cleaner 41.
  • a windward side of the motor blower 1 is provided with a dust collecting means 43 including a centrifugal type dust collecting portion 43a and a pleat-shaped dust collecting filter 43b.
  • a hose 44, an extension pipe 45 and a nozzle 46 are connected to the windward side of the dust collecting means 43 assembled in the cleaner body 42.
  • the vacuum cleaner 41 into which the motor blower 1 is assembled can suppress or reduce a generation of abnormal noise even under operational conditions of the low airflow rate and the high frequency region, i.e., even if a cross sectional area of an air flow path is narrowed due to the dust accumulated in the dust collecting means 43, the vacuum cleaner 41 can be operated in a calm and quiet manner. Further, the vacuum cleaner 41 can be calmly operated with a low noise level even if an voltage is changed.
  • a generation of abnormal noise can be suppressed or reduced even if the cleaner is operated under conditions of the low airflow rate and the high frequency region.
  • Noise levels at times of the low airflow rate and the maximum airflow rate were measured by using the motor blower (Example) according to the present invention such as shown in Fig. 1 .
  • the measured values were compared with those of the conventional motor blower (Comparative Example) such as shown in Fig. 11 .
  • the noise value of the motor blower of Example is 89.5 dB (A), while that of the motor blower of Comparative Example is 91.8 dB (A).
  • the noise value of the motor blower of Example is 88.3 dB (A), while that of the motor blower of the Comparative Example is 90.8 dB (A).
  • the noise value of the motor blower of Example is 96.1 dB (A), while that of the motor blower of the Comparative Example is 94.5 dB (A).
  • the noise value of the motor blower of the Example is 87.6 dB (A), while that of the motor blower of the Comparative Example is 88.2 dB (A).
  • the noise value of the motor blower of the Example is 89.6 dB (A), while that of the motor blower of the Comparative Example is 89.6 dB (A).
  • the noise value of the motor blower of the Example is 92.0 dB (A), while that of the motor blower of the Comparative Example is 91.6 dB (A).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Electric Suction Cleaners (AREA)
EP08251979A 2007-06-07 2008-06-06 Motor blower and electric vacuum cleaner using same Ceased EP2000070B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007151937A JP2008303793A (ja) 2007-06-07 2007-06-07 電動送風機、これを用いた電気掃除機

Publications (3)

Publication Number Publication Date
EP2000070A2 EP2000070A2 (en) 2008-12-10
EP2000070A3 EP2000070A3 (en) 2009-10-14
EP2000070B1 true EP2000070B1 (en) 2012-02-01

Family

ID=39711952

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08251979A Ceased EP2000070B1 (en) 2007-06-07 2008-06-06 Motor blower and electric vacuum cleaner using same

Country Status (5)

Country Link
EP (1) EP2000070B1 (ru)
JP (1) JP2008303793A (ru)
KR (1) KR20080108021A (ru)
CN (1) CN101319682A (ru)
RU (1) RU2388400C2 (ru)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9089248B2 (en) * 2009-02-16 2015-07-28 Samsung Electronics Co., Ltd. Fan motor apparatus having diffuser unit for vacuum cleaner
JP5316192B2 (ja) * 2009-04-16 2013-10-16 パナソニック株式会社 電動送風機およびこれを用いた電気掃除機。
DE102012211250A1 (de) * 2012-06-29 2014-01-02 BSH Bosch und Siemens Hausgeräte GmbH Staubsaugergebläse und Staubsauger mit einem Staubsaugergebläse
EP3318167B1 (en) * 2015-06-30 2022-04-27 Samsung Electronics Co., Ltd. Cleaner
JP2017012731A (ja) 2015-06-30 2017-01-19 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． 電気掃除機
CN105065323A (zh) * 2015-07-23 2015-11-18 韦江华 一种具有密封结构的动叶轮
US10448797B2 (en) 2016-10-19 2019-10-22 Tti (Macao Commercial Offshore) Limited Vacuum cleaner
PL442240A1 (pl) * 2022-09-09 2024-03-11 Wróblewski Andrzej Przedsiębiorstwo Techniczno-Handlowe Energowent Wentylator promieniowy

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7015615A (ru) * 1970-10-24 1972-04-26
JPS52112507U (ru) * 1976-02-24 1977-08-26
JP2002115698A (ja) 2000-10-10 2002-04-19 Matsushita Electric Ind Co Ltd 電動送風機及びそれを用いた電気掃除機
KR100629328B1 (ko) * 2004-02-03 2006-09-29 엘지전자 주식회사 청소기의 송풍장치
JP2006161803A (ja) * 2004-12-09 2006-06-22 Samsung Kwangju Electronics Co Ltd 掃除機用インペラーおよびこれを有するモータ組立体

Also Published As

Publication number Publication date
EP2000070A3 (en) 2009-10-14
CN101319682A (zh) 2008-12-10
EP2000070A2 (en) 2008-12-10
KR20080108021A (ko) 2008-12-11
RU2008122877A (ru) 2009-12-20
RU2388400C2 (ru) 2010-05-10
JP2008303793A (ja) 2008-12-18

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