US20060280596A1 - Blower and cleaner including the same - Google Patents

Blower and cleaner including the same Download PDF

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Publication number
US20060280596A1
US20060280596A1 US11/331,053 US33105306A US2006280596A1 US 20060280596 A1 US20060280596 A1 US 20060280596A1 US 33105306 A US33105306 A US 33105306A US 2006280596 A1 US2006280596 A1 US 2006280596A1
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US
United States
Prior art keywords
diffuser
blades
impeller
blade
diffuser blades
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.)
Abandoned
Application number
US11/331,053
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English (en)
Inventor
Dong Kim
Seon Na
Byoung Lee
Jae Joo
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.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co 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
Priority claimed from KR1020050049762A external-priority patent/KR100634792B1/ko
Priority claimed from KR1020050062379A external-priority patent/KR20070007631A/ko
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Assigned to SAMSUNG ELECTRONICS CO., LTD. reassignment SAMSUNG ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JOO, JAE MAN, KIM, DONG WON, LEE, BYOUNG IN, NA, SEON UK
Publication of US20060280596A1 publication Critical patent/US20060280596A1/en
Abandoned legal-status Critical Current

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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
    • F04D29/66—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
    • 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
    • A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
    • 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
    • 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

  • the present invention relates to a blower, and, more particularly, to a blower designed to reduce noise generated between impeller blades and diffuser blades positioned around the impeller blades upon rotation of an impeller, and a cleaner including the same.
  • blowers are used for generating air flow or raising a pressure, and are classified into a centrifugal type, a mixed flow type, an axial flow type, and the like.
  • the centrifugal blower refers to a blower in which an impeller including a plurality of circumferentially arranged blades sucks air from an outside into the blower, and discharges it radially from the blower while being rotated by a motor.
  • a diffuser is located at an outlet of the impeller, and acts to convert dynamic pressure of fluid into static pressure thereof.
  • FIG. 1 is a plan view illustrating an impeller and a diffuser of a conventional centrifugal blower used for the vacuum cleaner.
  • a fan guide 3 is positioned around an outer periphery of an impeller 2 including a plurality of impeller blades 1 , and is provided with a diffuser 5 including a plurality of diffuser blades 4 .
  • the blower is designed to minimize a distance G between the impeller and the diffuser in consideration of efficiency and performance of the blower.
  • the impeller blades 1 when the impeller 2 rotates at a high speed to generate a high suction force, the impeller blades 1 periodically face diffuser blades 4 , generating severe Blade Passage Frequency (BPF) noise.
  • BPF Blade Passage Frequency
  • Noise generated from the vacuum cleaner includes the BPF noise as mentioned above, noise caused by vibration of the motor, aeroacoustic noise from an air suction side, and the like.
  • BPF noise As mentioned above, noise caused by vibration of the motor, aeroacoustic noise from an air suction side, and the like.
  • severe BPF noise is generated at a specific frequency, it causes severe displeasure to a user or other persons surrounding the vacuum cleaner.
  • a blower which includes a diffuser not having blades, and a three-dimensional impeller designed to compensate reduction in performance due to the diffuser not having the blades.
  • a blower is disclosed in Korean Patent Application Laid-open Publication No. 1998-59321.
  • a blower including an impeller including a plurality of impeller blades and being rotated by a motor, and a diffuser including a plurality of diffuser blades and being located around an outer periphery of the impeller, wherein the plurality of diffuser blades are non-uniformly spaced from each other in a circumferential direction so as to reduce noise caused by interaction between the plurality of impeller blades and the plurality of diffuser blades upon rotation of the impeller.
  • the plurality of diffuser blades may be arranged such that a central angle defined between a pair of adjacent diffuser blades is different from other central angles defined between other pairs of adjacent diffuser blades.
  • x 0 n/2
  • y 0 360/n
  • n the number of diffuser blades
  • a, b, and c are constants.
  • the number of diffuser blades may be determined to have no common divisor except for 1 with respect to the number of the impeller blades.
  • the impeller and the diffuser may be arranged to have non-uniform distances between the impeller blades and the diffuser blades in order to strengthen noise reduction effect.
  • At least one of the impeller blades may be further spaced at a distal end thereof by a predetermined distance from an associated diffuser blade adjacent to the distal end of the impeller blade, in comparison to distances between other impeller blades and their associated diffuser blades.
  • At least one of the diffuser blades may be further spaced at a distal end thereof by a predetermined distance from an associated impeller blade adjacent to the distal end of the diffuser blade, in comparison to distances between other diffuser blades and their associated impeller blades.
  • a cleaner including a blower including an impeller including a plurality of impeller blades and being rotated by a motor, and a diffuser including a plurality of diffuser blades and being located around an outer periphery of the impeller to generate suction force for intake of foreign substances, wherein first ends of the respective diffuser blades adjacent to the impeller are non-uniformly spaced from each other in a circumferential direction so as to allow variation in period of the impeller blades passing the diffuser blades upon rotation of the impeller.
  • the plurality of diffuser blades are arranged such that a central angle defined between a pair of adjacent diffuser blades is different from a central angle defined between another pair of adjacent diffuser blades, and as for a specific reference for the arrangement of the diffuser blades, the above equation may be applied.
  • FIG. 1 is a plan view illustrating an impeller and a diffuser of a conventional centrifugal blower used for a vacuum cleaner;
  • FIG. 2 is a view illustrating a cleaner in accordance with the present invention
  • FIG. 3 is a cross-sectional view illustrating the construction of a body of the cleaner
  • FIG. 4 is a cross-sectional view illustrating the construction of a blower in accordance with a first embodiment of the present invention
  • FIG. 5 is a perspective view illustrating an impeller and a fan guide of the blower
  • FIG. 6 is a view illustrating an example of irregular disposition of diffuser blades in the blower in a circumferential direction
  • FIG. 7 is a plan view illustrating an impeller and a diffuser in a blower in accordance with a second embodiment of the present invention.
  • FIG. 8 is a plan view illustrating an impeller and a diffuser in a blower in accordance with a third embodiment of the present invention.
  • FIG. 2 is a view illustrating an appearance of a cleaner in accordance with the present invention
  • FIG. 3 is a cross-sectional view illustrating the construction of a body of the cleaner.
  • the cleaner of the present invention includes a suction unit 10 to suck dust or foreign substances via suction force, and a body 20 which includes a filter to collect the dust sucked through the suction unit, and a blower 30 to generate the suction force.
  • the cleaner further includes a connection hose 11 and a connection pipe 12 arranged to transfer the suction force generated by the blower 30 to the suction unit 10 between the body 20 and the suction unit 10 , and a handle 13 between the connection hose 11 and the connection pipe 12 .
  • the handle 12 has a controller (not shown) integrally provided therein so as to allow easy operation by a user.
  • the connection hose 11 is made from a stretchable ribbed pipe.
  • the connection hose 11 is connected at one end to the body 20 , and at the other end to the handle 13 .
  • the connection pipe 12 is connected at one end to the suction unit 10 , and at the other end to the handle 13 so that an operator can freely move the cleaner to clean floor.
  • the body 20 is partitioned into a dust collecting compartment 20 a in which the filtering unit is positioned, and a suction compartment 20 b in which the blower 30 is positioned.
  • the dust collecting compartment 20 a is provided with a dust bag 22 to collect the dust, and a filter 23 to filter fine dust which is not filtered by the dust bag 22 .
  • the suction compartment 20 b is provided with the blower 30 to generate the suction force for intake of the foreign substances.
  • FIG. 4 is a cross-sectional view illustrating the construction of a blower in accordance with a first embodiment of the invention
  • FIG. 5 is a perspective view illustrating an impeller and a fan guide of the blower.
  • the blower 30 includes an impeller cover 31 which has a suction port 31 a formed on an upper surface, and a motor case 32 coupled to a lower side of the impeller cover 31 , which defines an outer appearance of the blower 30 .
  • the impeller 40 includes a plurality of impeller blades 41 to suck air through the suction port 31 a.
  • Each of the impeller blades 41 is curved circumferentially between an upper plate 42 and a lower plate 43 of the impeller 40 such that air sucked through the suction port 31 a is discharged via the blower 30 in a radial direction.
  • the blower 30 includes a plurality of diffuser blades 61 around an upper periphery of the fan guide 50 , and acts to raise a pressure of the air passing through the impeller 40 .
  • the diffuser 60 is positioned around the impeller 40 while being separated a predetermined distance from the impeller 40 .
  • the fan guide 50 is formed at a lower surface with a return channel 51 which guides air passing through the diffuser 60 towards a motor 33 .
  • the motor 33 is positioned within the motor case 32 , and connected to the impeller 40 via a rotational shaft 34 to rotate the impeller 40 .
  • the motor case 32 has an air vent 35 formed at one side, through which air passing through the motor 33 is discharged to an outside of the motor case 32 .
  • the impeller 40 is rotated by the motor 33 to suck air through the suction port 31 a and to discharge the air in the radial direction.
  • the discharged air is raised in pressure while passing through the diffuser 60 .
  • the air is guided towards a lower side of the fan guide 50 , and is induced towards the motor 33 through the return channel 51 .
  • the induced air cools the motor 33 while passing through the motor 33 , and is finally discharged through the discharge port 35 of the motor case 32 .
  • the plurality of impeller blades 41 When the impeller 40 rotates at a high speed in order to generate a high suction force, the plurality of impeller blades 41 periodically faces the diffuser blades 61 with a narrow distance therebetween, and generates strong BPF noise. This noise is harsh to the ear.
  • noise generated between the impeller blades 41 and the diffuser blades 61 is modulated by constituting the impeller 40 and the diffuser 60 such that the plurality of diffuser blades are non-uniformly arranged in the circumferential direction so as to provide non-uniform interaction between the impeller blades 41 and the diffuser blades 61 , thereby reducing the noise.
  • FIG. 6 is a view illustrating an example of the arrangement of the diffuser blades in the blower in which the diffuser blades are non-uniformly arranged in the circumferential direction.
  • a circumferential distance between two points significantly changes according to a central angle defined between the points.
  • the plurality of diffuser blades 61 can be non-uniformly arranged by defining a central angle ⁇ 1 between a pair of adjacent diffuser blades (for example, 61 a and 61 b ) to be different from a central angle ⁇ 2 defined between another pair of adjacent diffuser blades (for example, 61 f and 61 g ).
  • the term “central angle between the pair of adjacent diffuser blades” means the central angle formed by a pair of first end (A and B or F and C) of the diffuser blades adjacent to the impeller 40 .
  • y is a central angle defined between a diffuser blade located at an xth position from the reference blade 61 a and a diffuser blade located at an x- 1 th position from the reference blade 61 a.
  • x 0 n/2
  • y 0 360/n
  • n the number of diffuser blades
  • a, b, and c are constants.
  • the central angle between the pair of adjacent diffuser blades can be determined by Equation 1, and even if the number of the diffuser blades is changed due to the design, appropriate central angles corresponding to the changed number of diffuser blades can be easily obtained by Equation 1.
  • Equation 2 the central angle between the pair of adjacent diffuser blades can be obtained using the following Equation 2.
  • x 0 n/2
  • n the number of diffuser blades
  • a, b, and c are constants.
  • y y 0 + a ⁇ ⁇ e - ( x / x 0 ) ⁇ ⁇ sin ⁇ ( 2 ⁇ ⁇ ⁇ ⁇ x b + c ) [ Equation ⁇ ⁇ 2 ]
  • the central angle between the pair of adjacent diffuser blades can be suitably determined by Equation 2.
  • the number of diffuser blades 61 is determined to have no common divisor except for 1 with respect to the number of the impeller blades 41 .
  • interaction between the diffuser blades 61 and the impeller blades 41 is minimized upon rotation of the impeller 40 , reducing the BPF noise.
  • FIG. 6 shows the case where the number of diffuser blades 61 is 11, and the number of impeller blades 41 is 9.
  • blower and the vacuum cleaner of the invention are designed to reduce noise by arranging the impeller and the diffuser to have non-uniform distances between the impeller blades and the diffuser blades as well as by arranging the diffuser blades to be non-uniformly spaced from each other in the circumferential direction as described above.
  • FIG. 7 is a plan view illustrating an impeller and a diffuser in a blower in accordance with a second embodiment of the present invention
  • FIG. 8 is a plan view illustrating an impeller and a diffuser in a blower in accordance with a third embodiment of the present invention.
  • the embodiments shown in FIGS. 7 and 8 are modifications of the embodiment shown in FIG. 6 .
  • At least one impeller blade 41 a of the impeller blades may be further spaced at a distal end thereof by a predetermined distance d 1 from an associated diffuser blade adjacent to the distal end of the impeller blade 41 a, in comparison to distances between other impeller blades 41 and their associated diffuser blades 61 .
  • d 1 a predetermined distance from an associated diffuser blade adjacent to the distal end of the impeller blade 41 a
  • At least one diffuser blade 61 c, 61 f or 61 j of the diffuser blades may be further spaced at a distal end thereof by a predetermined distance d 2 from an associated impeller blade adjacent to the distal end of the diffuser blade 61 c, 61 f or 61 j, in comparison to distances between other diffuser blades 61 and their associated impeller blades 41 .
  • a distance d 1 or d 2 acts to change a passage period of the impeller blades 41 with respect to the diffuser blades 61 , and thus reduces noise caused by the interaction between the impeller blades 41 and the diffuser blades 61 .
  • the distance between the impeller 40 and the diffuser 60 is significantly increased, the performance of the blower can be deteriorated.
  • one of the advantageous effects of the invention is that the impeller blades and the diffuser blades are arranged to have irregular interaction therebetween in the blower, thereby reducing BPF noise from the blower.
  • the diffuser can be easily applied to products such as a vacuum cleaner, thereby enhancing quality of the products.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Electric Suction Cleaners (AREA)
US11/331,053 2005-06-10 2006-01-13 Blower and cleaner including the same Abandoned US20060280596A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020050049762A KR100634792B1 (ko) 2005-06-10 2005-06-10 송풍기와 이를 구비하는 청소기
KR2005-49762 2005-06-10
KR2005-62379 2005-07-11
KR1020050062379A KR20070007631A (ko) 2005-07-11 2005-07-11 송풍기와 이를 구비하는 청소기

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US20060280596A1 true US20060280596A1 (en) 2006-12-14

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US11/331,053 Abandoned US20060280596A1 (en) 2005-06-10 2006-01-13 Blower and cleaner including the same

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US (1) US20060280596A1 (fr)
EP (1) EP1731070A1 (fr)
JP (1) JP2006342792A (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7845900B2 (en) 2007-07-12 2010-12-07 Abb Turbo Systems Ag Diffuser for centrifugal compressor
US20110265285A1 (en) * 2010-04-30 2011-11-03 Morgan Charles J Upright vacuum with reduced noise
US20130017079A1 (en) * 2011-07-14 2013-01-17 Jonathan Armstrong Debris blowing and/or vacuum appliance
WO2012135835A3 (fr) * 2011-04-01 2013-03-14 Envision Strategies Group, Inc. Procédé et appareil pour faire varier indépendamment le flux d'air et la génération de bruit d'un ventilateur
CN103154527A (zh) * 2011-01-05 2013-06-12 松下电器产业株式会社 电动鼓风机和具有该电动鼓风机的电动吸尘器
US8528166B2 (en) 2010-04-30 2013-09-10 Techtronic Floor Care Technology Limited Upright vacuum with floating head
US20150173577A1 (en) * 2013-12-24 2015-06-25 Samsung Electronics Co., Ltd. Cleaning device
US20170108012A1 (en) * 2015-10-14 2017-04-20 Lenovo (Beijing) Limited Fan and method of manufacturing a fan
US9810239B2 (en) 2014-07-31 2017-11-07 Nidec Corporation Electric blower
US20180142700A1 (en) * 2015-04-28 2018-05-24 Ziehl-Abegg Se Diagonal or radial fan having a guide device
US20190063464A1 (en) * 2017-08-31 2019-02-28 Ford Global Technologies, Llc Engine cooling fans with uneven blade spacing
US10448797B2 (en) 2016-10-19 2019-10-22 Tti (Macao Commercial Offshore) Limited Vacuum cleaner
US20230121923A1 (en) * 2020-01-14 2023-04-20 Ziehl-Abegg Se Support module for a fan and fan having a corresponding support module

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008025440A (ja) * 2006-07-20 2008-02-07 Toshiba Corp 電動送風機
WO2014021116A1 (fr) * 2012-08-01 2014-02-06 株式会社マキタ Dispositif de nettoyage portatif et dispositif électrique
US9777746B2 (en) * 2013-09-03 2017-10-03 Dresser-Rand Company Motor cooling system manifold
EP3207846B1 (fr) * 2016-02-19 2019-01-09 Nilfisk A/S Carter de moteur avec silencieux destiné à un dispositif de nettoyage par aspiration
KR102171454B1 (ko) * 2019-07-10 2020-10-29 엘지전자 주식회사 팬모터 및 그 제조방법

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US6139275A (en) * 1998-07-28 2000-10-31 Kabushiki Kaisha Toshiba Impeller for use in cooling dynamoelectric machine

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KR100629328B1 (ko) * 2004-02-03 2006-09-29 엘지전자 주식회사 청소기의 송풍장치

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US3006603A (en) * 1954-08-25 1961-10-31 Gen Electric Turbo-machine blade spacing with modulated pitch
US3873231A (en) * 1972-08-11 1975-03-25 Allis Chalmers Centrifugal pump diffuser
US4474534A (en) * 1982-05-17 1984-10-02 General Dynamics Corp. Axial flow fan
US6139275A (en) * 1998-07-28 2000-10-31 Kabushiki Kaisha Toshiba Impeller for use in cooling dynamoelectric machine

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7845900B2 (en) 2007-07-12 2010-12-07 Abb Turbo Systems Ag Diffuser for centrifugal compressor
US9717382B2 (en) 2010-04-30 2017-08-01 Techtronic Floor Care Technology Limited Upright vacuum with floating head
US20110265285A1 (en) * 2010-04-30 2011-11-03 Morgan Charles J Upright vacuum with reduced noise
US8528166B2 (en) 2010-04-30 2013-09-10 Techtronic Floor Care Technology Limited Upright vacuum with floating head
US8839485B2 (en) 2010-04-30 2014-09-23 Techtronic Floor Care Technology Limited Upright vacuum with floating head
CN103154527A (zh) * 2011-01-05 2013-06-12 松下电器产业株式会社 电动鼓风机和具有该电动鼓风机的电动吸尘器
US8499412B2 (en) 2011-01-05 2013-08-06 Panasonic Corporation Electric blower and electric cleaner with same
WO2012135835A3 (fr) * 2011-04-01 2013-03-14 Envision Strategies Group, Inc. Procédé et appareil pour faire varier indépendamment le flux d'air et la génération de bruit d'un ventilateur
US10100846B2 (en) 2011-04-01 2018-10-16 Envision Strategy Group, Inc. Method and apparatus for independently varying airflow and noise generation of a fan
US20130017079A1 (en) * 2011-07-14 2013-01-17 Jonathan Armstrong Debris blowing and/or vacuum appliance
US20150173577A1 (en) * 2013-12-24 2015-06-25 Samsung Electronics Co., Ltd. Cleaning device
US10470633B2 (en) * 2013-12-24 2019-11-12 Samsung Electronics Co., Ltd. Cleaning device
US9757000B2 (en) * 2013-12-24 2017-09-12 Samsung Electronics Co., Ltd. Cleaning device
US20170332861A1 (en) * 2013-12-24 2017-11-23 Samsung Electronics Co., Ltd. Cleaning device
WO2015099350A1 (fr) * 2013-12-24 2015-07-02 Samsung Electronics Co., Ltd. Dispositif de nettoyage
US9810239B2 (en) 2014-07-31 2017-11-07 Nidec Corporation Electric blower
US20180142700A1 (en) * 2015-04-28 2018-05-24 Ziehl-Abegg Se Diagonal or radial fan having a guide device
US10724539B2 (en) * 2015-04-28 2020-07-28 Ziehl-Abegg Se Diagonal or radial fan having a guide device
US20170108012A1 (en) * 2015-10-14 2017-04-20 Lenovo (Beijing) Limited Fan and method of manufacturing a fan
US10570929B2 (en) * 2015-10-14 2020-02-25 Lenovo (Beijing) Limited Fan and method of manufacturing a fan
US10448797B2 (en) 2016-10-19 2019-10-22 Tti (Macao Commercial Offshore) Limited Vacuum cleaner
US20190063464A1 (en) * 2017-08-31 2019-02-28 Ford Global Technologies, Llc Engine cooling fans with uneven blade spacing
US20230121923A1 (en) * 2020-01-14 2023-04-20 Ziehl-Abegg Se Support module for a fan and fan having a corresponding support module

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JP2006342792A (ja) 2006-12-21
EP1731070A1 (fr) 2006-12-13

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