EP0467557B2 - Blower assembly with impeller for vacuum cleaner - Google Patents

Blower assembly with impeller for vacuum cleaner Download PDF

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Publication number
EP0467557B2
EP0467557B2 EP91306038A EP91306038A EP0467557B2 EP 0467557 B2 EP0467557 B2 EP 0467557B2 EP 91306038 A EP91306038 A EP 91306038A EP 91306038 A EP91306038 A EP 91306038A EP 0467557 B2 EP0467557 B2 EP 0467557B2
Authority
EP
European Patent Office
Prior art keywords
impeller
vanes
shroud plate
casing
flange
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.)
Expired - Lifetime
Application number
EP91306038A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0467557A1 (en
EP0467557B1 (en
Inventor
Yukiji Iwase
Shigenori Sato
Masao Sunagawa
Hisanori Toyoshima
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.)
Hitachi Ltd
Original Assignee
Hitachi 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=16259788&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0467557(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to EP94101775A priority Critical patent/EP0602007B1/en
Publication of EP0467557A1 publication Critical patent/EP0467557A1/en
Application granted granted Critical
Publication of EP0467557B1 publication Critical patent/EP0467557B1/en
Publication of EP0467557B2 publication Critical patent/EP0467557B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • A47L9/02—Nozzles
    • A47L9/08—Nozzles with means adapted for blowing

Definitions

  • This invention relates to vacuum cleaner blower assemblies and to vacuum cleaners, having an impeller and a blower motor driving the impeller.
  • JP-A-59-74396 discloses an impeller for an electric blower in which a shroud plate is defined in the vicinity of the inlet of an impeller by a continuous curve, as viewed in an axial plane, having a large curvature as compared to the inner diameter of the impeller.
  • This design can reduce exhaust noise, but is liable to relatively increase the sound transmitted through walls in the vacuum cleaner, due to vibrations transmitted to the walls.
  • JP-A-59-74396 also, a covering portion of the blower casing is disposed substantially perpendicularly to the shroud plate of the impeller in the vicinity of the inlet of the impeller. Consequently, when the axial direction of the incoming air flow changes to the radial direction in the inlet region of the impeller, the flow breaks away on the side of the shroud, causing a large loss. Since the aerodynamic condition of the flow is bad in the inlet section of the impeller, noise proportional to the product of the number of vanes and the rotational speed of the impeller tends to increase.
  • the length of overlap between the impeller inlet and the blower casing is determined by the thickness of the shroud plate of the impeller, the length of a sealing portion is limited to as small as 1 mm; thus, it is difficult to decrease the leakage flow rate between the shroud plate and the casing.
  • the leak flow is substantially perpendicular to the main flow at the inlet of the impeller, break-away of the flow is promoted.
  • the shroud plate is curved as viewed in the axial plane, the hub plate opposite the shroud plate and the shroud plate tend to be deformed during the fixing of the shroud plate and the vanes together, creating deviation of the impeller from the desired shape. Further, a gap tends to appear at the end surface of the vane inside the impeller, increasing leakage and loss.
  • the object of the present invention is at least partly to avoid the disadvantages described above, and to improve the air flow efficiency through the blower of a vacuum cleaner.
  • a vacuum cleaner blower assembly as set out in claim 1.
  • a vacuum cleaner as set out in claim 2
  • a vacuum cleaner as set out in claim 6.
  • the shroud plate of the impeller is frusto-conical in shape at its region adjacent the impeller vanes.
  • Embodiments of impellers and vacuum cleaner blowers of the invention will now be described. They may be fitted in conventional vacuum cleaners. Examples of vacuum cleaners in which they may be mounted are shown in European Patent Applications 91303152.2 and 91303496.3.
  • the electric vacuum cleaner blower shown in Fig. 1 and 2 is composed of a blower portion 80 and a motor portion 81. Disposed inside a housing 81a of the motor portion 81 are a rotor 83 secured to a rotating shaft 82 and a stator 85 including coils 84a and 84b.
  • the housing 81 a has a bearing-retaining portion 81b formed at the centre of its end wall, and a bearing 86a for rotatably supporting one end of the rotating shaft 82 is disposed in the bearing-retaining portion 81b.
  • the housing 81a also has exhaust ports 81c in its peripheral surface.
  • the housing 81a has an end bracket 87 at the opposite end, and this end bracket 87 connects the blower portion 80 and the motor 81 together.
  • the end bracket 87 has a bearing retaining portion 87a at its centre and a flat portion 87b around its circumference.
  • the flat portion 87b is formed with suction ports 88 through which the air from the blower 80 is sent into the motor 81 to cool it.
  • Disposed in the bearing-retaining portion 87a is a bearing 86b for rotatably supporting the other end of the rotating shaft 82.
  • the end bracket 87 carries a diffuser 89, and on the upstream side of the diffuser, a centrifugal impeller 90 is secured to the rotating shaft 82 by means of a nut 91.
  • the centrifugal impeller 90 and the diffuser 89 are covered by a blower casing 92 pressure-fitted to the circumference of the end bracket 87.
  • the blower casing 92 has a suction port 93 formed in its central portion to provide an inlet to the central inlet region of the impeller.
  • the diffuser 89 is composed of a plurality of diffuser vanes 94 arranged radially outside the circumference of the centrifugal impeller 90.
  • a plural-ity of return guide vanes 95 are arranged on the back of a wall 89a lying adjacent the impeller 90 and supporting the diffuser vanes 94.
  • the wall 89a has a rounded outer peripheral edge to smooth the air flow from the diffuser vanes 94 to the return guide vanes 95, and in conjunction with the wall 89a and the end bracket 87, the return guide vanes 95 define a return guide passage through which the air flow is guided to the suction ports 88.
  • Fig. 2 shows the configuration of the centrifugal impeller 90 and the diffuser region in more detail.
  • the impeller 90 is composed of a plurality of vanes 96, a shroud plate 97 and hub plate 98.
  • Each vane 96 has on each edge three protrusions which are fitted in holes formed in the shroud plate 97 and the hub plate 98 and then caulked or upset, so that these components are rigidly and tightly secured together at these connection points.
  • the vanes 96 are curved as they extend outwardly, but for convenience this is not indicated in Fig. 2.
  • the outer diameter portion of the shroud plate 97 is frusto-conical, i.e. straight as seen in the axial plane, radially outwardly of the innermost point of connection 99 to the vanes 96. Inwardly of the point 99, the shroud plate 97 is shaped as to define a rounded portion 97a ending in an upwardly turned flange 97b whose end portion is at about 20° to the impeller axis.
  • the radius of curvature of the rounded portion 87a is 0,7 times the vane inlet width.
  • the blower casing 92 is shaped to provide an inwardly bent flange 92a, and a leakage gap 100 is left between the flange 92a and the flange 97b of the impeller 90. As seen in Fig. 2, the flanges 92a and 97b overlap axially (see also Figs. 4 and 5), with the flange 92a radially inside.
  • the leak flow Since the direction of the leak flow is parallel to the axis and in this region the main flow is also parallel to the axis, the leak flow does not have bad influence on the main flow, and since the radius of curvature of the rounded portion 97a of the shroud plate is large, the main flow breaks away from the shroud plate 97 at most only slightly.
  • the shroud plate 97 is straight from its outer circumference to the innermost point of connection 99 as viewed in the axial plane, and there is only a small difference in height of the vane 96 between its inlet and outlet. Therefore, although the vane 96 is curved in the circumferential direction in a conventional manner, the force applied in caulking each protrusion of the vane 96 does not vary from one caulking point to another. Accordingly, the deformation of the shroud plate 97 and of the hub plate 98 is minimized even under the force applied to each caulking point. Consequently, hardly any gaps arise between the vanes 96, shroud plate 97 and hub plate 98, and leak flow between the pressure side and suction pressure side of the vane 96 is suppressed. Further, since any face deflection of the shroud plate 97 and of the hub plate 98 is small, unbalance hardly arises; thus, noise based on a frequency corresponding to the rotational speed decreases.
  • the shroud plate 97 is straight in its outer diameter portion, as viewed in the axial plane, and has a rounded portion 97a inwardly from the innermost point of connection 99, as in Fig. 2.
  • the shroud plate 97 in this case is provided with a cylindrical portion 97b extending axially from the end of the rounded portion 97a.
  • the blower casing 101 has an inwardly bent flange 101a at its inner diameter region, so that the gap 100 is left between the flange 101 and the cylindrical portion 97b of the impeller 90. Since the length of the gap 100 is much larger than the thickness of the shroud plate 97, the friction loss of the leak flow can be made very large, the leak flow can be reduced remarkably, and the efficiency of the electric blower can be improved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Electric Suction Cleaners (AREA)
EP91306038A 1990-07-20 1991-07-03 Blower assembly with impeller for vacuum cleaner Expired - Lifetime EP0467557B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94101775A EP0602007B1 (en) 1990-07-20 1991-07-03 Vacuum cleaner having an impeller and diffuser

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP190540/90 1990-07-20
JP2190540A JP2852106B2 (ja) 1990-07-20 1990-07-20 電気掃除機及び電動送風機
JP19054090 1990-07-20

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP94101775A Division EP0602007B1 (en) 1990-07-20 1991-07-03 Vacuum cleaner having an impeller and diffuser
EP94101775.8 Division-Into 1994-02-07

Publications (3)

Publication Number Publication Date
EP0467557A1 EP0467557A1 (en) 1992-01-22
EP0467557B1 EP0467557B1 (en) 1994-12-14
EP0467557B2 true EP0467557B2 (en) 2001-09-26

Family

ID=16259788

Family Applications (2)

Application Number Title Priority Date Filing Date
EP91306038A Expired - Lifetime EP0467557B2 (en) 1990-07-20 1991-07-03 Blower assembly with impeller for vacuum cleaner
EP94101775A Expired - Lifetime EP0602007B1 (en) 1990-07-20 1991-07-03 Vacuum cleaner having an impeller and diffuser

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP94101775A Expired - Lifetime EP0602007B1 (en) 1990-07-20 1991-07-03 Vacuum cleaner having an impeller and diffuser

Country Status (4)

Country Link
EP (2) EP0467557B2 (ja)
JP (1) JP2852106B2 (ja)
KR (1) KR0180742B1 (ja)
DE (2) DE69127832T2 (ja)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100409173B1 (ko) * 1995-06-26 2004-03-26 가부시끼가이샤 히다치 세이사꾸쇼 전기청소기
AU7691196A (en) * 1995-11-24 1997-06-19 Nilfisk A/S A blower for a vacuum cleaner
DE19605742A1 (de) * 1996-02-16 1997-08-21 Vorwerk Co Interholding Elektromotor mit einem Gebläserad
DE19606146A1 (de) * 1996-02-20 1997-08-21 Vorwerk Co Interholding Schnellaufender Elektromotor
WO1997037423A2 (de) * 1996-03-29 1997-10-09 AEG Hausgeräte GmbH Strömungsmaschine, insbesondere für ein haushaltsgerät
DE19733687B4 (de) * 1996-08-12 2005-04-21 Samsung Kwangju Electronics Co., Ltd. Motorgebläse für ein Reinigungsgerät
JP3840299B2 (ja) 1996-12-27 2006-11-01 日本テトラパック株式会社 パッケージ製造装置の折り線形成装置
DE19717154A1 (de) 1997-04-23 1998-10-29 Bosch Siemens Hausgeraete Gebläseanordnung
AU761926B2 (en) * 1998-09-11 2003-06-12 Peter John King Fluid pumps
DE19855905B4 (de) * 1998-12-03 2013-02-21 BSH Bosch und Siemens Hausgeräte GmbH Gebläseanordnung
CN1124417C (zh) * 1999-04-20 2003-10-15 三洋电机株式会社 电动送风机以及使用它的电动吸尘器
KR100437018B1 (ko) * 2001-08-29 2004-06-23 엘지전자 주식회사 진공 청소기용 원심 송풍기
KR20030048918A (ko) * 2001-12-13 2003-06-25 주식회사 엘지이아이 진공청소기용 원심송풍기
GB0203147D0 (en) * 2002-02-11 2002-03-27 Dyson Ltd An exhaust assembly
GB0613796D0 (en) * 2006-07-12 2006-08-23 Johnson Electric Sa Blower
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
DE102017215261B4 (de) 2017-08-31 2020-12-24 BSH Hausgeräte GmbH Gebläse für ein elektrogerät
WO2023108921A1 (zh) * 2021-12-16 2023-06-22 广东威灵电机制造有限公司 风机及其清洁设备

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT1967B (ja) * 1899-12-23 1900-08-25 Richard Arnold
FR2076426A5 (ja) * 1970-01-14 1971-10-15 Cit Alcatel
US4012166A (en) * 1974-12-04 1977-03-15 Deere & Company Supersonic shock wave compressor diffuser with circular arc channels
JPS5349313A (en) * 1976-10-18 1978-05-04 Matsushita Electric Ind Co Ltd Motor fan for vacuum cleaners
DE3204113A1 (de) * 1982-02-06 1983-08-11 Henschel Gerätebau GmbH, 3035 Hodenhagen Turbine fuer einen auto- oder campinghandstaubsauger
JPS58134698U (ja) * 1982-03-05 1983-09-10 日産自動車株式会社 可変デイフユ−ザ
US4547927A (en) * 1983-12-08 1985-10-22 Shop-Vac Corporation Compact vacuum cleaner
JPS60173398A (ja) * 1984-02-16 1985-09-06 Matsushita Electric Ind Co Ltd 送風機
US4735555A (en) * 1985-10-01 1988-04-05 Rexair, Inc. Air blower assembly for vacuum cleaner
US4797072A (en) * 1987-06-19 1989-01-10 Shop-Vac Corporation Portable electric blower
JPH02156920A (ja) * 1988-12-09 1990-06-15 Hitachi Ltd 電気掃除機

Also Published As

Publication number Publication date
KR920002084A (ko) 1992-02-28
EP0602007B1 (en) 1997-10-01
DE69127832D1 (de) 1997-11-06
EP0467557A1 (en) 1992-01-22
EP0602007A2 (en) 1994-06-15
JPH0481600A (ja) 1992-03-16
EP0602007A3 (en) 1994-12-28
EP0467557B1 (en) 1994-12-14
DE69105845D1 (de) 1995-01-26
DE69127832T2 (de) 1998-04-30
KR0180742B1 (ko) 1999-02-01
DE69105845T2 (de) 1995-04-27
JP2852106B2 (ja) 1999-01-27

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