EP2441962B1 - Impeller, and electric blower and electric cleaner provided with impeller - Google Patents

Impeller, and electric blower and electric cleaner provided with impeller Download PDF

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Publication number
EP2441962B1
EP2441962B1 EP11791190.9A EP11791190A EP2441962B1 EP 2441962 B1 EP2441962 B1 EP 2441962B1 EP 11791190 A EP11791190 A EP 11791190A EP 2441962 B1 EP2441962 B1 EP 2441962B1
Authority
EP
European Patent Office
Prior art keywords
inducer
impeller
section
shroud
vane sections
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.)
Not-in-force
Application number
EP11791190.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2441962A1 (en
EP2441962A4 (en
Inventor
Teppei Hidekuma
Tsuyoshi Nishimura
Kazuhisa Morishita
Hiroyuki Kayama
Kazushige Nakamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Original Assignee
Panasonic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Corp filed Critical Panasonic Corp
Publication of EP2441962A1 publication Critical patent/EP2441962A1/en
Publication of EP2441962A4 publication Critical patent/EP2441962A4/en
Application granted granted Critical
Publication of EP2441962B1 publication Critical patent/EP2441962B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
    • F04D29/285—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors the compressor wheel comprising a pair of rotatable bladed hub portions axially aligned and clamped together
    • 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

Definitions

  • the present invention relates to an impeller and an electric blower, an electric vacuum cleaner equipped with the same impeller.
  • Blowing performance suction performance of an electric blower used in an electric vacuum cleaner has been tried to improve specifically with respect to the impeller of the blower.
  • a structure formed of a front shroud, a rear shroud, multiple blades, and an inducer having multiple vane sections has been proposed (e.g. refer to Patent Literature 1).
  • Fig. 11 is a partially cut-away perspective view for illustrating a structure of the conventional impeller discussed above.
  • impeller 321 includes rear shroud 322, front shroud 323, sheet metal blades 324, and resinous inducer 325.
  • Rear shroud 322 is made of sheet metal.
  • Front shroud 323 is disposed separately from rear shroud 322 with a space therebetween and having suction port 323a at its center.
  • Multiple sheet metal blades 324 are held by and between rear shroud 322 and front shroud 323.
  • Inducer 325 made of resin is disposed correspondingly to suction port 323a.
  • Resinous inducer 325 includes conical hub 325b and vane sections 325a formed on hub 325b. Vane sections 325a have a three-dimensional curve for rectifying the air flowing from suction port 323a to sheet metal blades 324.
  • Fig. 12A is a plan view illustrating the movement of a mold during the molding of resinous inducer 325 of the conventional impeller 321.
  • Fig. 12B is a lateral view illustrating this movement.
  • resinous inducer 325 is formed through a resin molding process using laterally-sliding mold 331 that slides radially toward the outer circumference of vane section 325a.
  • the mold includes laterally-sliding mold 331, upward-sliding mold 332, and downward-sliding mold 333.
  • Molds 331 in equal numbers to that of vanes of vane sections 325a are prepared.
  • Upward-sliding mold 332 in equal numbers to that of vanes of vane sections 325a are prepared.
  • Downward-sliding mold 333 in equal numbers to that of vanes of vane sections 325a are prepared.
  • vane sections 325a of resinous inducer 325 in numbers of six and metal sheet blades 324 in numbers of also six are ideal quantities for improving the blowing (sucking) efficiency of impeller 321 of the conventional electric blower.
  • a numbers over the six for vane sections 325a as well as for metal sheet blades 324 can sometimes gain the better blowing efficiency depending on an air volume and an rpm.
  • a high frequency tone which is a kind of noises generated by the electric blower, is generated conspicuously at the frequency of a product of multiplying the number of vanes (numbers of vane sections 325a and the number of metal sheet blades 324) of impeller 321 by the rpm.
  • the frequency of the high frequency tone generated by the electric blower is audible frequency band to users, so that the tone sounds harshly and sometimes makes the users unpleasant.
  • the method of molding resinous inducer 325 of impeller 321 of the conventional electric blower finds it difficult to mold inducer 325 having 6 or more than 6 vanes, and in a case where an end face of front shroud 323 side of a vane section 325a overlaps, viewed from the top or the side, with an end face of metal sheet blade 324 of the adjacent vane section 325a, the molding becomes also difficult.
  • Patent Literature 2 describes a motor-driven blower which improves the air quantity and vacuum degree by installing an inducer for smoothly feeding air into an impeller, lower than the height of the shroud of the impeller, on the inner peripheral part of the impeller.
  • An impeller consists of a plurality of blades and shroud nipping the blades, and an impeller back plate.
  • the height of the inducer is set lower than the height of the impeller shroud.
  • the bottom surface of the inducer is closely attached on the impeller back plate, and the inducer and the impeller are simultaneously fixed on the rotary shaft of a motor.
  • the invention is defined by the subject-matter of independent claim 1.
  • the dependent claims are directed to advantageous embodiments.
  • an impeller for an electric blower where vanes of an inducer of this impeller can be multiplied with ease and improving the blowing efficiency as well as lowering the noise
  • the present invention also aims to provide the electric blower and an electric vacuum cleaner both equipped with this impeller.
  • the impeller includes a front shroud having a first opening at its center section, a rear shroud disposed separately from the front shroud with a space therebetween, multiple blades held by and between the front and rear shrouds and extending from a center section toward an outer circumference of the rear shroud, and an inducer disposed at the center section of the rear shroud.
  • the inducer includes an upper inducer disposed at the front shroud side and a lower inducer disposed at the rear shroud side.
  • the impeller of the present invention allows the inducer to be equipped with multiple vane sections with ease and improving the blowing efficiency and lowering the noises.
  • impeller 1 in accordance with the first embodiment of the present invention and also electric blower 100 equipped with impeller 1.
  • Fig. 1 is a sectional view partially illustrating a structure of electric blower 100 equipped with impeller 1 in accordance with the first embodiment of the present invention.
  • Fig. 2 is a partially cut-away perspective view illustrating a structure of impeller 1 in accordance with the first embodiment of the present invention.
  • Fig. 3 is an exploded perspective view illustrating a structure of impeller 1 in accordance with the first embodiment of the present invention.
  • Fig. 4 is a sectional view illustrating a structure of impeller 1 in accordance with the first embodiment of the present invention.
  • electric blower 100 includes impeller 1, air guide 2, fan case 3, motor 4, and bracket 6 disposed on a counter-load side.
  • Impeller 1 generates an air current (suction air).
  • Air guide 2 is disposed confronting an outer rim of impeller 1 for rectifying the air current supplied from impeller 1.
  • Fan case 3 accommodates impeller 1 and air guide 2 therein.
  • Motor 4 drives impeller 1.
  • Bracket 6 disposed at counter-load side is placed on the outer wall of motor 4, and fan case 3 is mounted to bracket 6 hermetically.
  • Impeller 1 is supported by shaft 5 of motor 4.
  • Counter-load side bracket 6 includes exhausting opening 7 for exhausting the air sucked by impeller 1.
  • impeller 1 includes front shroud 20, rear shroud 21, multiple blades 22, and inducer 23.
  • Front shroud 20 includes a first opening, i.e. suction port 20a, at its center section.
  • Rear shroud 21 is disposed separately from front shroud 20 with a space therebetween.
  • Multiple blades 22 are held by and between front shroud 20 and rear shroud 21, and extend from the center section toward the outer circumference (rim) of rear shroud 21.
  • Inducer 23 is disposed at the center section of rear shroud 21, and is held by and between front shroud 20 and rear shroud 21.
  • Each one of blades 22 has multiple mating protrusions 22a and 22b respectively on its faces to be brought into contact with front shroud 20 and rear shroud 21.
  • Front shroud 20 and rear shroud 21 have multiple mating slits 20b and 21a for receiving mating protrusions 22a and 22b respectively.
  • Mating protrusions 22a and 22b are inserted into slits 20b and 21a respectively, and they are crimped together, whereby each blade 22 can be mounted to front shroud 20 and rear shroud 21.
  • Inducer 23 is split into upper inducer 24 and lower inducer 27 with a plane in parallel to rear shroud 21, namely, the plane vertical relative to shaft 5 of motor 4.
  • Upper inducer 24 stays on front shroud 20 side
  • lower inducer 27 stays on rear shroud 21 side.
  • Inducer 23 is formed this way: end face P1 on front shroud 20 side of a vane section of inducer 23 overlaps with end face P2 on blade 22 side of an adjacent vane section of the same inducer 23, and this overlap is viewed from a top or a lateral view. In other words, this form is difficult for a conventional molding method to mold.
  • upper inducer 24 includes ring section 25 having second opening 25a at the center and multiple first vane sections 26 extending from ring section 25 toward the outer circumference (rim) of inducer 23.
  • Lower inducer 27 includes base section 28, multiple second vane sections 29, and shaft section 30.
  • Base section 28 is mounted to rear shroud 21 and forms a conical shape.
  • Second vane sections 29 extend from the center section of base section 28 toward the outer rim thereof.
  • Shaft section 30 extends from the center section of base section 28 toward upper inducer 24, and fits into ring section 25.
  • lower inducer 27 and rear shroud 21 have third opening 27a and fourth opening 21b at their centers for receiving shaft 5 of motor 4 respectively.
  • Shaft 5 of motor 4 is fit into and supported by third opening 27a and fourth opening 21b, whereby impeller 1 can be driven by motor 4.
  • projection 30a is formed on shaft section 30 of lower inducer 27 at base section 28 side.
  • Recess 25b is formed on ring section 25 of upper inducer 24 at lower inducer 27 side, and recess 25b mates with projection 30a.
  • Upper inducer 24 is thus positioned relative to and mounted to lower inducer 27 by using projection 30a and recess 25b.
  • Upper inducer 24 and lower inducer 27 form inducer 23. and ring section 25 of upper inducer 24 fits into shaft section 30 of lower inducer 27, whereby upper inducer 24 is positioned relative to and mounted to lower inducer 27. This simple structure allows holding upper inducer 24 and lower inducer 27 together more firmly.
  • First vane sections 26 of upper inducer 24 and second vane sections 29 of lower inducer 27 form the vane sections of inducer 23.
  • ring section 25 of upper inducer 24 and shaft section 30 of lower inducer 27 are formed such that plane P3 on outer wall of ring 25 forming the same plane of plane P4 of base section 28 of lower inducer 27 at front shroud 20 side when upper inducer 24 is mounted to lower inducer 27.
  • the number of first vane sections 26 of upper inducer 24, the number of second vane sections 29 of lower inducer 27, and the number of blades 22 are determined nine (9) respectively considering the air volume of electric blower 100 and the rpm of impeller 1.
  • Front shroud 20, rear shroud 21 and blades 22 are made of metal, and inducer 23 is made of resin.
  • Fig. 5A is a plan view illustrating a structure of a mold for lower inducer 27 of impeller 1 in accordance with the first embodiment of the present invention.
  • Fig. 5B is a lateral view of this mold structure.
  • Fig. 6A is a plan view illustrating a structure of a mold for upper inducer 24 of impeller 1 in accordance with the first embodiment of the present invention.
  • Fig. 6B is a lateral view of this mold structure.
  • the mold of lower inducer 27 has angular intervals of 40 degrees, and includes sliding molds 31 disposed in nine directions, core 32 for molding lower inducer 27 from the top, and cavity 33 for molding lower inducer 27 from the bottom.
  • Inducer 23 has this structure therein: end face P1 on a vane section of inducer 23 at front shroud 20 side overlaps with end face P2 on an adjacent vane section of the same inducer 23 at blade 22 side, and this overlap is viewed from the top face or the lateral face.
  • inducer 23 is split into upper inducer 24 and lower inducer 27, the mold structure discussed above allows molding this inducer 23.
  • the mold for upper inducer 24 includes core 42 for molding upper inducer 24 from the top and cavity 43 for molding upper inducer 24 from the bottom.
  • inducer 23 As discussed previously, it is difficult for inducer 23 with a conventional structure and a conventional molding method to have multiple vane sections.
  • inducer 23 is held by and between front shroud 20 and rear shroud 21, inducer 23 can be held firmly with this simple structure. Inducer 23 can have multiple vane sections with ease as discussed above. Use of impeller 1 in accordance with this first embodiment allows electric blower 100 to improve the blowing efficiency and lower the noises.
  • Impeller 51 in accordance with the second embodiment of the present invention is demonstrated hereinafter.
  • Fig. 7 is a sectional view illustrating a structure of impeller 51.
  • groove section 34 is provided on a perimeter of front shroud 20 at a position where first vane section 26 is brought into contact with second vane section 29.
  • Groove section 34 has a shape similar to an end face of the first vane section 26 and the second vane section 29 which are brought into contact with each other at groove section 34 of front shroud 20, and groove section 34 has a width almost equal to that of this end face.
  • This structure i.e. groove section 34, allows front shroud 20 to hold inducer 23 more firmly.
  • Groove section 34 also allows correcting warp or deformation produced during the molding of inducer 23 by internal stress.
  • impeller 51 in accordance with the second embodiment allows inducer 23 to have multiple vane sections with ease. Electric blower 100 can thus improve the blowing efficiency and lower the noises.
  • Impeller 52 in accordance with the third embodiment of the present invention is demonstrated hereinafter.
  • Impeller 52 in accordance with the third embodiment of the present invention is demonstrated hereinafter with reference to Fig. 8 which is a sectional view illustrating a structure of impeller 52. Similar elements to those of impeller 1 and impeller 51 discussed in embodiments 1 and 2 have the same reference marks, and the descriptions thereof are omitted here.
  • second vane section 29 includes projection 29a extending from an end face, contacting with front shroud 20, toward front shroud 20.
  • Front shroud 20 includes hole 20c at a place corresponding to projection 29a for receiving projection 29a.
  • Inducer 23 is rigidly mounted to front shroud 20 by inserting projection 29a of second vane section 29 into hole 20c of front shroud 20 and welding them together.
  • projection 29a is formed on second vane section 29; however, the present invention is not limited to this structure.
  • projection 29a can be formed on first vane section 26, or it can be formed on both first vane section 26 and second vane section 29.
  • Impeller 53 in accordance with the fourth embodiment of the present invention is demonstrated hereinafter.
  • Impeller 53 in accordance with the fourth embodiment of the present invention is demonstrated hereinafter with reference to Fig. 9 which is a sectional view illustrating a structure around the center of impeller 53.
  • tab 30b is formed around the end face of shaft section 30 of lower inducer 27 at front shroud 20 side, and tab 30b is received like a stopper on ring section 25 of upper inducer 24 at front shroud 20 side.
  • This structure allows upper inducer 24 to hold lower inducer 24 more firmly along the shaft direction, so that inducer 23 can be equipped with multiple vane sections with ease.
  • use of impeller 53 in accordance with the fourth embodiment allows electric blower 100 to improve the blowing efficiency and lower the noises.
  • Electric vacuum cleaner 200 in accordance with the fifth embodiment of the present invention is demonstrated hereinafter.
  • Electric vacuum cleaner 200 in accordance with the fifth embodiment of the present invention is demonstrated hereinafter with reference to Fig. 10 which schematically shows vacuum cleaner 200. Similar elements to those used in embodiments 1 - 4 have the same reference marks, and the descriptions thereof are omitted here.
  • cleaner 200 includes main body 201, intake tool 202 for sucking dust from a target surface for cleaning, hose 203 of which first end is hooked up to main body 201, extension tube 204 of which first end is connected to hose 203 and the other end is connected to intake tool 202.
  • Manual operation section 205 is provided to an end section on hose 203 at extension tube 204 side.
  • Main body 201 includes one of impellers 1, 51, 52, 53 demonstrated in embodiments 1 - 4, electric blower 100 for generating suction air, and dust collector 206 placed on upstream side of blower 100 for collecting dust.
  • a user holds manual operation section 205 and starts the operation of cleaner 200, and then electric blower generates suction air for producing suction force.
  • the user moves intake tool 202 on the target face, then dust together with the air can be sucked from the target face through intake tool 202.
  • the dust and air sucked flow into dust collector 206 through extension tube 204 and hose 203, and dust collector 206 separates the dust from the air, and only the dust is collected in dust collector 206.
  • the air separated from dust is sucked by electric blower 100 and passes through blower 100 and main body 201 before it is discharged outside main body 201.
  • electric vacuum cleaner 200 in accordance with the fifth embodiment includes electric blower 100 equipped with one of impeller 1, 51, 52, or 53 demonstrated in embodiments 1 - 4, cleaner 200 achieves high suction performance and low noises.
  • Use of electric vacuum cleaner 200 in accordance with the fifth embodiment allows the users to carry out a clean-up efficiently.
  • the impeller of the present invention is not limited to the structure of impeller 1, 51, 52, or 53 demonstrated in the previous embodiments.
  • the number of first vane sections 26, the number of second vane sections 29, the number of blades 22 are set 9 (nine) respectively in embodiments 1 - 4.
  • the impeller of the present invention is not limited to this structure. Those numbers can be set appropriately for the air volume of the electric blower and the rpm of the impeller.
  • the impeller of the present invention allows the inducer to be equipped with multiple vane sections with ease. So that an electric blower or an electric vacuum cleaner equipped with this impeller can improve the suction performance and lower the noises.
  • the impeller allows the electric vacuum cleaner to increase the sucking power and lower the noises.
  • the present invention is thus useful for household electric appliances and industrial devices using an electric blower.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP11791190.9A 2010-06-29 2011-05-12 Impeller, and electric blower and electric cleaner provided with impeller Not-in-force EP2441962B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010147074A JP2012012937A (ja) 2010-06-29 2010-06-29 インペラ、及びそれを備えた電動送風機及び電気掃除機
PCT/JP2011/002643 WO2012001861A1 (ja) 2010-06-29 2011-05-12 インペラ、ならびに、それを備えた電動送風機および電気掃除機

Publications (3)

Publication Number Publication Date
EP2441962A1 EP2441962A1 (en) 2012-04-18
EP2441962A4 EP2441962A4 (en) 2013-01-02
EP2441962B1 true EP2441962B1 (en) 2014-11-12

Family

ID=45401611

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11791190.9A Not-in-force EP2441962B1 (en) 2010-06-29 2011-05-12 Impeller, and electric blower and electric cleaner provided with impeller

Country Status (5)

Country Link
EP (1) EP2441962B1 (ja)
JP (1) JP2012012937A (ja)
CN (1) CN102510954A (ja)
TW (1) TW201200091A (ja)
WO (1) WO2012001861A1 (ja)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130110440A (ko) * 2012-03-29 2013-10-10 삼성전기주식회사 임펠러 및 이를 포함한 진공청소기 모터 어셈블리
JP6091072B2 (ja) * 2012-04-02 2017-03-08 本田技研工業株式会社 回転体及びインペラ
JP6203867B2 (ja) * 2013-12-27 2017-09-27 本田技研工業株式会社 インペラ
JP7145588B2 (ja) * 2017-06-14 2022-10-03 日立グローバルライフソリューションズ株式会社 電動送風機及びそれを備えた電気掃除機
CN107664139A (zh) * 2017-09-28 2018-02-06 镇江三联泵业机械成套设备有限公司 便于拆卸叶片的叶轮
CN109586492B (zh) * 2017-09-29 2024-10-01 广东朗科智能电气有限公司 吸尘器电机
CN109578299A (zh) * 2017-09-29 2019-04-05 广东朗科智能电气有限公司 吸尘器电机及其风机结构和风轮
CN109586426A (zh) * 2017-09-29 2019-04-05 广东朗科智能电气有限公司 吸尘器电机及其电机定子
TWI696440B (zh) * 2018-01-29 2020-06-21 王勝豊 清潔裝置
SI25978A (sl) * 2020-03-05 2021-09-30 HYLA, Proizvodnja, razvoj in trgovina d.o.o Separator za sesalnik

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JPH0178287U (ja) * 1987-11-13 1989-05-25
JPH03138493A (ja) * 1989-10-20 1991-06-12 Matsushita Electric Ind Co Ltd 電動送風機
DE4109646A1 (de) * 1991-03-23 1992-09-24 Bosch Gmbh Robert Laufrad fuer einen radialluefter
JP3617103B2 (ja) * 1995-03-08 2005-02-02 松下電器産業株式会社 電動送風機
JPH0998918A (ja) * 1995-10-03 1997-04-15 Hitachi Ltd 電気掃除機
JP3629787B2 (ja) * 1995-12-25 2005-03-16 松下電器産業株式会社 電動送風機
JP3796974B2 (ja) 1998-07-31 2006-07-12 松下電器産業株式会社 電動送風機
JP4140086B2 (ja) * 1998-07-17 2008-08-27 松下電器産業株式会社 電動送風機
JP4428044B2 (ja) * 2003-03-24 2010-03-10 株式会社日立プラントテクノロジー 羽根車の製作方法、及び羽根車
TWI278573B (en) * 2004-10-07 2007-04-11 Sunonwealth Electr Mach Ind Co Impeller assembly
JP2007244563A (ja) * 2006-03-15 2007-09-27 Matsushita Electric Ind Co Ltd 電動送風機およびそれを用いた電気掃除機
GB0613796D0 (en) * 2006-07-12 2006-08-23 Johnson Electric Sa Blower

Also Published As

Publication number Publication date
WO2012001861A1 (ja) 2012-01-05
JP2012012937A (ja) 2012-01-19
EP2441962A1 (en) 2012-04-18
EP2441962A4 (en) 2013-01-02
TW201200091A (en) 2012-01-01
CN102510954A (zh) 2012-06-20

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Inventor name: NAKAMURA, KAZUSHIGE

Inventor name: NISHIMURA, TSUYOSHI

Inventor name: KAYAMA, HIROYUKI

Inventor name: MORISHITA, KAZUHISA

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