EP1627590A2 - Zentrifugalgebläse und Staubsauger umfassend ein solches Zentrifugalgebläse - Google Patents

Zentrifugalgebläse und Staubsauger umfassend ein solches Zentrifugalgebläse Download PDF

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Publication number
EP1627590A2
EP1627590A2 EP05291656A EP05291656A EP1627590A2 EP 1627590 A2 EP1627590 A2 EP 1627590A2 EP 05291656 A EP05291656 A EP 05291656A EP 05291656 A EP05291656 A EP 05291656A EP 1627590 A2 EP1627590 A2 EP 1627590A2
Authority
EP
European Patent Office
Prior art keywords
diffuser
partition plate
air
driving motor
impeller
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.)
Granted
Application number
EP05291656A
Other languages
English (en)
French (fr)
Other versions
EP1627590B1 (de
EP1627590A3 (de
Inventor
Ki-Dong Kim
Kwang-Woon Ahn
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP1627590A2 publication Critical patent/EP1627590A2/de
Publication of EP1627590A3 publication Critical patent/EP1627590A3/de
Application granted granted Critical
Publication of EP1627590B1 publication Critical patent/EP1627590B1/de
Expired - Fee Related 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
    • 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
    • A47L9/22—Mountings for motor fan assemblies

Definitions

  • the present invention relates to a centrifugal fan of a vacuum cleaner and, more particularly, to a centrifugal fan capable of enhancing a suction force and efficiency by reducing flow resistance of air forcibly sent from an impeller.
  • Figure 1 is a sectional view of a centrifugal fan in accordance with a conventional art.
  • the conventional centrifugal fan includes an impeller casing 104 having a suction opening 102 formed at its front side, a motor housing 108 connected with the impeller casing 104 and having a discharge hole 106 for discharging air, a driving motor 110 installed in the motor housing 108 and generating a rotational force, an impeller 116 rotatably disposed at the impeller casing 104 and connected with the driving motor 110 by a rotational shaft 112 to generate an air blowing force, and a guide vane 130 disposed at a rear side of the impeller 116, increasing a static pressure of air sent from the impeller 116 and guiding air sent from the impeller 116 toward the discharge hole 106 through the driving motor 110.
  • the impeller 116 includes a hub 118 fixed at the rotational shaft 112 by a holder 140 and a plurality of blades 120 connected at equal intervals in a circumferential direction at an outer circumferential surface of the hub 118 and sending air in a radial direction.
  • the guide vane 130 includes defusers 132 formed at an outer circumferential surface of the blade 120 of the impeller 116 with a certain interval from an end portion of the blade 120, a partition plate 134 fixed at an inner circumferential surface of the impeller casing 104 on which the diffusers 132 are formed, and a rear vane 136 formed at a lower surface of the partition plate 134 and guiding air discharged from the defusers 132 so as to pass through the driving motor 110.
  • the conventional centrifugal fan operates as follows.
  • the impeller 116 When the rotational shaft 112 is rotated as the driving motor 110 is driven, the impeller 116 is rotated to suck air through the suction opening 102.
  • the air sucked through the suction opening 102 is sent in the radial direction by the blades 120 of the impeller 116 to pass through the diffusers 132, a static pressure of the air being increased while passing through the diffusers 132, bent perpendicularly and is guided to pass through the motor by the rear vane 136 formed at the rear side of the partition plate 134.
  • Air which has cooled the driving motor 110 while passing therethrough is discharged externally through the discharge hole 106 formed at the motor housing 108.
  • the air flow resistance generated as the air flow introduced into the rear vane 136 is sharply changed perpendicularly causes an impact with noise and a pressure loss.
  • the channel resistance generated in the diffuser 132 and the rear vane 136 causes degradation of efficiency by rapidly changing the speed energy of air to pressure energy, and increases a pressure loss of air.
  • an object of the present invention is to provide a centrifugal fan capable of reducing a pressure loss and enhancing a suction force and efficiency by reducing air flow resistance by making air pass through a diffuser slopingly downward, and a vacuum cleaner having the centrifugal fan.
  • a centrifugal fan including: a driving motor for generating a rotational force; an impeller connected with the driving motor by a rotational shaft and generating an air blowing force; a diffuser disposed at an outer circumferential surface of the impeller and increasing a constant pressure of air sent from the impeller; a partition plate installed inside an impeller casing; and a rear vane formed at a lower surface of the partition plate and guiding air discharged from the diffuser so as to pass through the driving motor.
  • the diffuser is formed such that each blade is sloped downward from an inlet towards an outlet. Namely, two adjacent diffuser blades form an air flow path therebetween with each diffuser blade having are relatively greater width at an air inlet portion compared to the width at an air outlet portion.
  • the partition plate has an outer edge portion, on which the diffuser is formed, that slopes downward from an inner portion toward an outer circumferential edge thereof.
  • the partition plate also has a lower surface that slopes downward from an outer circumferential edge toward an inner portion thereof.
  • a vacuum cleaner including a cleaner body having a centrifugal fan for generating a suction force and a dust collection filter for collecting dust, and a suction nozzle for sucking dust
  • the centrifugal fan includes: a driving motor for generating a rotational force; an impeller connected with the driving motor by a rotational shaft and generating an air blowing force; a diffuser disposed at an outer circumferential surface of the impeller and increasing a constant pressure of air sent from the impeller; a partition plate fixed at an inner circumferential surface of an impeller casing; and a rear vane formed at a lower surface of the partition plate and guiding air discharged from the diffuser so as to pass through the driving motor, wherein the diffuser is formed to be sloped downward from the inlet to the outlet.
  • Figure 3 is a perspective view of a vacuum cleaner in accordance with the present invention
  • Figure 4 is a sectional view of a main body of the vacuum cleaner in accordance with the present invention
  • Figure 5 is a sectional view of a centrifugal fan in accordance with the present invention.
  • a cleaner in accordance with the present invention includes a cleaner body 14 having a dust collection filter 10 and a centrifugal fan 12, an extension pipe 18 connected with the cleaner body 14 by a suction hose 16, and a suction nozzle 20 mounted at an end portion of the extension pipe 18 and sucking dust and debris from the floor.
  • the cleaner body 14 includes a first chamber 24 having a connection part 22 formed at a front side thereof to which the suction hose 16 is connected and a dust collection filter 10 installed therein, and a second chamber 26 having the centrifugal fan 12 installed therein.
  • a filter 28 is mounted at a suction side of the second chamber 26 and an exhaust hole 30 is formed to externally discharge air discharged from the centrifugal fan 12.
  • the centrifugal fan 12 includes an impeller casing 52 having a suction opening 50 formed at its front side, a motor housing 56 mounted at a lower side of the impeller casing 52 and having a discharge hole 54 for discharging air, a driving motor 58 installed in the motor housing 56 and generating a rotational force, an impeller 62 rotatably disposed at the impeller casing 52 and connected with the driving motor by a rotational shaft 60 to generate an air blowing force, and a guide vane 68 rotatably disposed at a rear side of the impeller 62, increasing a static pressure of air sent from the impeller 62, and guiding air sent from the impeller 62 so as to pass through the driving motor 58 to the discharge hole 54.
  • the driving motor 58 includes a stator 70 fixed on an inner circumferential surface of the motor housing 56, to which power is applied, and a rotor 72 disposed at an inner circumferential surface of the stator 70, rotated by an electromagnetic force when power is applied to the stator 70.
  • the rotational shaft 60 is fixed at the rotor 72.
  • the impeller 62 includes a hub 64 fixed at the rotational shaft 60 by a holder 74 and a plurality of blades 66 connected at an outer circumferential surface of the hub 64 at equal intervals and sending air in a radial direction.
  • Figure 6 is a perspective view of a guide vane of the centrifugal fan in accordance with the present invention
  • Figure 7 is a sectional view of the guide vane of the centrifugal fan in accordance with the present invention
  • Figure 8 is a side view of the guide vane of the centrifugal fan in accordance with the present invention
  • Figure 9 is a top view of the guide vane of the centrifugal fan in accordance with the present invention
  • Figure 10 is a bottom view of the guide vane of the centrifugal fan in accordance with the present invention.
  • the guide vane 68 includes a diffuser 80 disposed at an outer circumferential surface of the blade 66 of the impeller 62 with a certain interval from an end of the blade 66, and increasing a constant pressure of air sent from the impeller 62; the partition plate 82 fixed at the impeller casing 52, and a rear vane 84 formed at a lower surface of the partition plate 82 and guiding air discharged from the diffuser 80 so as to pass through the driving motor 58.
  • the diffuser 80 includes a plurality of diffuser blades 80a disposed to overlap with a certain interval therebetween at the edge portion of the upper surface of the partition plate 82 in a circumferential direction, and a passage 86 is formed between the diffuser blades 80a to allow air to pass therethrough.
  • a passage 86 an area of an outlet portion through which air is discharged to the rear vane 84 is larger than an area of an inlet portion to which air sent from the impeller 62 is introduced, whereby air can spread to increase its static pressure and reduce air flow rate.
  • the diffuser blades 80a of the diffuser 80 have a curved form in the same direction as a rotation direction of the impeller 62, and has a lower slope from an inlet to an outlet. Namely, the portion of the partition plate 82 on which the diffuser 80 is formed to be sloped downward from an outer circumferential edge toward an inner portion thereof. Accordingly, because the diffuser 80 is formed on the sloped surface 88 of the partition plate 82, the diffuser 80 slopes downward from the inlet to the outlet.
  • the diffuser blades 80a of the diffuser 80 are sloped from the inner portion to the outer circumferential edge, air passing through the passages 86 between the diffuser blades 80a is discharged to be sloped at a certain angle downward as indicated by an arrow 'P', whereby air flow resistance can be reduced.
  • the rear vane 84 includes a plurality of vane blades 86a formed in a spiral form in an outward direction at a lower surface of the partition plate 82 and guides air whose constant pressure has been increased while having passed through the diffuser 80 to the driving motor 58.
  • the rear vane 84 has a height which is increased from its edge to the center.
  • the lower surface of the partition plate 82 has a slope surface 90 sloped at a certain angle from an outer side to the inner side, on which the rear vane 86 is formed, so that the height of the rear vane 86 is gradually increased from its edge to the center of the partition plate 82.
  • the centrifugal fan in accordance with the present invention operates as follows.
  • the rotor 72 When power is applied to the driving motor, the rotor 72 is rotated according to interaction of the rotor 72 and the stator 70, and accordingly, the rotational shaft 60 connected with the rotor 72 is rotated to rotate the impeller 62. Then, air is sucked through the suction opening 50, and the sucked air is sent in a radial direction by the blades 66, passes through the passage 86 between diffuser blades 80a, during which its static pressure is increased.
  • the diffuser 80 is formed to be sloped downward from the inner portion toward the outer circumferential edge thereof, air which has passed through the passages 86 is discharged slopingly downward as indicated by the arrow 'P', and thus, its flow resistance can be reduced.
  • air guided by the rear vane 84 performs the cooling operation on the driving motor 58 while passing between the stator 70 and the rotor 72 of the driving motor 58 and then externally discharged through the discharge hole 54 formed at the motor housing 56.
  • the centrifugal fan and the cleaner having the centrifugal fan have the following advantages.
  • the diffuser is formed to be sloped downward from the inlet to the outlet, air can be discharged slopingly in the downward direction, and also, because the rear vane is formed to have a slope, air can flow slopingly downward, the air flow resistance can be reduced and a pressure loss can be reduced, and accordingly, a suction force and efficiency of the fan can be enhanced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • General Engineering & Computer Science (AREA)
EP20050291656 2004-08-13 2005-08-03 Zentrifugalgebläse für einen Staubsauger Expired - Fee Related EP1627590B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020040063904A KR20060015073A (ko) 2004-08-13 2004-08-13 진공청소기용 원심송풍기

Publications (3)

Publication Number Publication Date
EP1627590A2 true EP1627590A2 (de) 2006-02-22
EP1627590A3 EP1627590A3 (de) 2006-06-21
EP1627590B1 EP1627590B1 (de) 2009-10-14

Family

ID=36076664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050291656 Expired - Fee Related EP1627590B1 (de) 2004-08-13 2005-08-03 Zentrifugalgebläse für einen Staubsauger

Country Status (4)

Country Link
EP (1) EP1627590B1 (de)
KR (1) KR20060015073A (de)
CN (1) CN1734102A (de)
DE (1) DE602005017103D1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8152488B2 (en) 2006-07-12 2012-04-10 Johnson Electric S.A. Blower
CN106122104A (zh) * 2015-05-08 2016-11-16 松下知识产权经营株式会社 电动送风机的导气部件、电动送风机及电吸尘器

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101152062B (zh) * 2006-09-25 2010-09-29 财团法人工业技术研究院 自走式清洁装置
KR101975337B1 (ko) * 2012-02-09 2019-05-07 엘지전자 주식회사 진공 흡입 유닛 및 이를 구비하는 진공청소기
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
CN106958538B (zh) * 2017-05-11 2019-12-31 美的集团股份有限公司 离心风机及具有其的吸尘器
CN112610525B (zh) * 2020-12-09 2023-04-07 江苏美的清洁电器股份有限公司 用于吸尘器的风机以及吸尘器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59170495A (ja) * 1983-03-18 1984-09-26 Matsushita Electric Ind Co Ltd 電動送風機
US4679990A (en) * 1984-12-28 1987-07-14 Matsushita Electric Industrial Co., Ltd. Electric blower
EP0385298A2 (de) * 1989-03-01 1990-09-05 Hitachi, Ltd. Elektrogebläse mit Abluftrückführkanal
WO1997019629A1 (en) * 1995-11-24 1997-06-05 Nilfisk A/S A blower for a vacuum cleaner
DE19605742A1 (de) * 1996-02-16 1997-08-21 Vorwerk Co Interholding Elektromotor mit einem Gebläserad
EP1334685A2 (de) * 2002-02-07 2003-08-13 Johnson Electric S.A. Gebläsemotor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59170495A (ja) * 1983-03-18 1984-09-26 Matsushita Electric Ind Co Ltd 電動送風機
US4679990A (en) * 1984-12-28 1987-07-14 Matsushita Electric Industrial Co., Ltd. Electric blower
EP0385298A2 (de) * 1989-03-01 1990-09-05 Hitachi, Ltd. Elektrogebläse mit Abluftrückführkanal
WO1997019629A1 (en) * 1995-11-24 1997-06-05 Nilfisk A/S A blower for a vacuum cleaner
DE19605742A1 (de) * 1996-02-16 1997-08-21 Vorwerk Co Interholding Elektromotor mit einem Gebläserad
EP1334685A2 (de) * 2002-02-07 2003-08-13 Johnson Electric S.A. Gebläsemotor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 025 (M-355), 2 February 1985 (1985-02-02) -& JP 59 170495 A (MATSUSHITA DENKI SANGYO KK), 26 September 1984 (1984-09-26) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8152488B2 (en) 2006-07-12 2012-04-10 Johnson Electric S.A. Blower
CN106122104A (zh) * 2015-05-08 2016-11-16 松下知识产权经营株式会社 电动送风机的导气部件、电动送风机及电吸尘器
CN106122104B (zh) * 2015-05-08 2019-06-21 松下知识产权经营株式会社 电动送风机的导气部件、电动送风机及电吸尘器

Also Published As

Publication number Publication date
KR20060015073A (ko) 2006-02-16
EP1627590B1 (de) 2009-10-14
EP1627590A3 (de) 2006-06-21
CN1734102A (zh) 2006-02-15
DE602005017103D1 (de) 2009-11-26

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