WO2004004535A1 - Dispositif de diminution du bruit pour aspirateur - Google Patents

Dispositif de diminution du bruit pour aspirateur Download PDF

Info

Publication number
WO2004004535A1
WO2004004535A1 PCT/SE2003/001154 SE0301154W WO2004004535A1 WO 2004004535 A1 WO2004004535 A1 WO 2004004535A1 SE 0301154 W SE0301154 W SE 0301154W WO 2004004535 A1 WO2004004535 A1 WO 2004004535A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
vacuum cleaner
outlet
airflow
cleaner according
Prior art date
Application number
PCT/SE2003/001154
Other languages
English (en)
Inventor
Göran Nilsson
Tommy Andersson
Original Assignee
Aktiebolaget Electrolux
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 Aktiebolaget Electrolux filed Critical Aktiebolaget Electrolux
Priority to DE60321803T priority Critical patent/DE60321803D1/de
Priority to AU2003245215A priority patent/AU2003245215A1/en
Priority to EP03738842A priority patent/EP1551269B1/fr
Publication of WO2004004535A1 publication Critical patent/WO2004004535A1/fr

Links

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

Definitions

  • the present invention relates to a vacuum cleaner comprising at least one dust collector and one flow generator.
  • the dust collector comprises means for collecting particles transported by an airflow that flows into the collector via a first inlet and out of the collector via a first outlet.
  • the flow generator comprises a second inlet through which the air flow from the first outlet flows into the flow generator and a second outlet through which the air flows out of the flow generator, which also comprises an electric motor assembly, a motor cover and a motor housing.
  • Vacuum cleaners are characterised by their properties to suck up particles. Improved suction performance is, among other ways, achieved by increasing the suction power of the vacuum cleaner.
  • a natural way of increasing the power is to increase the power of the electric motor that is installed in the vacuum cleanser.
  • increased motor power creates problems with electrical interference such as electromagnetic fields and harmonics.
  • Efficiency is also considered when selecting the electric motor.
  • the motor assembly does normally not only comprise a motor but also a rotating fan part and a motor enclosure.
  • the rotating fan part forces the air to move and thereby generates the air flow, while the enclosure forces the air sucked in by the fan part to pass the motor assembly in a preferred way and then to flow out of the motor assembly through one or many outlets.
  • the properties of the enclosure results in, amongst other Itangs, that the air will cool the electric motor and that the air velocity inside the motor assembly assumes required levels.
  • the efficiency is here defined as the proportion of the electric power that results in a suction effect of the motor assembly.
  • Vacuum cleansers have mainly three noise sources.
  • the predominant noise source is the electric motor in the motor-fan assembly, which generates the airflow.
  • the motor itself radiates in a broad noise spectrum.
  • the air turbulence generated by aerodynamic imperfections along the air's flow path, also generates noise. Turbulence means that the air has varying velocity and direction in different parts of the same cross section. Particularly at higher air velocities (unit rn/s) and airflows (unit liter/s), there is a risk for turbulence.
  • a third noise generator is vibrating surfaces coming into contact with air. When much air with high velocity collides with the walls, they start to vibrate and generate noise. If the wall vibrates at its resonance frequency, the noise will be amplified to a higher degree.
  • the development efforts to reduce the noise levels are ongoing.
  • the unit for noise is dB and each dB of noise reduction achieved is a big step forward. Already two to three dB of noise reduction is noticeable for the user.
  • measures can be applied, such as the nozzle, the hose, the dust collector and the flow generator (the compartment of the vacuum cleaner where, amongst other things, the motor-fan assembly is situated).
  • the invention is mainly aimed at noise reducing measures in the flow generator.
  • the flow generator comprises a motor-fan assembly, suspensions, noise reducing material, air absorbing material and air channels. By working at improving the cooperation between these parts, noise reduction can be achieved.
  • the suspensions reduce the vibration levels and the noise reducing materials screen off noise created within the flow generator.
  • the air turbulence is reduced, i.e. laminar flow is created, by means of letting the airflow through air-penetrable materials.
  • the material increases the cross sectional area through which the air passes, which means decreased air velocity. Besides, the material decreases the suction power of the vacuum cleaner.
  • the ducts in the flow generator are aerodynamically shaped in order to achieve a more laminar flow. By giving the ducts a large cross sectional area, the velocity of the airflow is also reduced.
  • the problem with present solutions is that efforts to screen off noise from the motor- fan assembly have not been sufficient. Besides, the airflow in present solutions creates rather substantial vibrations in the materials of the vacuum cleaner. Furthermore, the turbulence is rather high due to the velocity of the airflow. The intention of the present invention is therefore to achieve a flow generator that generates less noise.
  • the present invention relates to lowering the vacuum cleaner's noise generating properties by means of changing the air's flow path in the flow generator. That is achieved by letting the flow generator comprise at least a third outlet through which mainly the whole airflow from the second inlet flows, the third outlet essentially being covered by an air-penetrable material through which mainly the whole airflow from the third outlet flows.
  • Fig.l shows an exploded view of a flow generator and a dust collector in accordance with the invention.
  • Fig. 2 shows a perspective view of the dust collector in accordance with fig. 1.
  • Fig. 3 shows a perspective view of the front suspension of the flow generator in accordance with fig. 1.
  • Fig. 4 shows a front view of the front suspension in accordance with fig. 3.
  • Fig.5 shows an exploded view of the motor-fan assembly, the rubber bushing and the diffuser of the flow generator in accordance with fig. 1.
  • Fig. 6 shows a perspective view of the flow generator's motor cover in accordance with fig. 1.
  • Fig. 7 shows a side view of the motor cover in accordance with fig. 6.
  • Fig. 8 shows a front view of the motor cover in accordance with fig. 6.
  • Fig. 9 shows a cross section of the motor cover in accordance with fig. 6.
  • Fig. 10 shows a perspective view of the absorbent in the flow generator in accordance with fig. 1.
  • Fig. 11 shows a perspective view of the flow generator's motor housing in accordance with fig. 1.
  • Fig. 12 shows the airflow through a cross section of the flow generator in accordance with fig. 1.
  • FIGS. 1-10 show an example of an embodiment of a flow generator in accordance with the invention.
  • the example of the embodiment shall not be interpreted as a limitation of the invention but its only purpose is to concretely shed light on a type of flow generator, which achieves the objective of the application.
  • the aim is to clarify the thought behind the invention.
  • Fig. 1 shows an exploded view of a dust collector 10 and a flow generator including its parts.
  • the parts comprise a motor-fan assembly 11, a rear rubber bushing 12 and a diffuser 13.
  • the flow generator comprise a motor cover 20, two outer rubber bushings 25, an absorbent 28 and in addition a front suspension 30 and a motor housing 40.
  • Fig. 2 shows further detail of the dust collector.
  • the collector in the embodiment example is intended to be used primarily together with a vacuum cleaner bag.
  • the air is flowing into the collector via the vacuum cleaner hose connected to a first inlet in a cover part (not shown), which, placed over the aperture 14, encloses the interior 15 of the dust collector.
  • the cover part and the dust collector shall co-operate in order to seal the interior in the best possible way. The tightness is important to achieve high suction power.
  • the air flowing into the interior passes through the vacuum cleaner bag (not shown) and subsequently flows out through a first outlet 16.
  • the bag can be replaced or complemented by a cyclone separator for collection of particles.
  • the outlet is covered by a star-shaped grid 17, which acts as a protection against unintended contact and directs the airflow out through the outlet.
  • a catastrophe filter (not shown), which collects the particles if for instance the bag should break.
  • the intention with the front suspension 30 in fig. 3 - 4 is to carry the front part of the motor-fan assembly 11 and the motor cover 20 at the dust collector 10 and the motor housing 40.
  • the suspension has rings 31 embodied at the front (the side directed towards the dust collector). These co-operate with the back of the dust collector (not shown), against which the suspension rests. Thereby the first outlet 16 is sealed against the second inlet 32 formed by the suspension, exiting in towards the flow generator so that no air chooses to flow in an alternative route than into the motor-fan assembly.
  • the intention with the holes 33 is to facilitate to arrange the motor housing 40 at the dust collector 10 by means of trough-going screws/bolts.
  • Fig. 4 shows the back of the suspension, towards which the motor-fan assembly 11 rests. The side is shaped 35 so that no air can escape other than through the assembly.
  • Four guide parts 34 integrated into one piece with the suspension 30 supports the assembly against the motor cover's 20 inner side when the flow generator is assembled.
  • the front suspension 30, placed between the motor cover 20 and the dust collector 10 seals so that no air escapes out of the cover that way.
  • the suspension placed between the motor housing 40 and the dust collector, seals so that no air escapes out of the housing that way.
  • the front suspension 30 is intended to serve as an elastic suspension of the motor-fan assembly 11 and the motor cover 20, which vibrate during operation. By means of the suspension, vibration propagation to other parts is avoided.
  • the suspension is, in order to achieve an elastic, compact and suitable solution, made from foamed PUR (Polyurethane) with air-bubbles.
  • PUR Polyurethane
  • PUR is a soft integral foam that combines softness with shape stability. It is chock absorbing and wear resistant. By puncturing some of the air-bubbles, the PUR in this form can absorb some water.
  • PUR which has good stability properties, increased suspension thickness can be achieved without supporting arrangements.
  • Fig. 5 shows an exploded view of the motor-fan assembly including accompanying rear rubber bushing 12 and diffuser 13.
  • the motor-fan assembly comprises an electric motor and rotating fan blades.
  • An enclosing cover has an aperture 18, in through which the air from the second inlet 32 in the suspension 30 flows.
  • the airflow through the vacuum cleaner is generated by the motor-driven fan blades.
  • the air flows through the entire assembly and passes on its way at the same time the motor. Subsequently the air flows out through apertures (not shown) in the rear, narrower part of the assembly.
  • the blades 19 of the diffuser cover the apertures in the rear part of the assembly. The air thereby passes straight through the diffuser and out at the rear side.
  • the diffuser consists of a cloth made of foam plastic.
  • the cloth is very air permeable and does basically not create any pressure drop.
  • the rear rubber bushing made of synthetic rubber (EPDM, TPE), is, when the assembly in the cover is arranged in the in the rear part of the assembly, also located at the inside of the motor cover. Thus vibration propagation from the assembly to the cover is avoided.
  • Fig. 6 - 9 show the motor cover 20.
  • the shape of the cover comprises an essential part of the invention.
  • the cover encloses the motor-fan assembly 11 and is, together with the assembly, sealed by the front suspension 30.
  • the cover's front rectangular edge 21 co-operates with the guide parts 34 of the suspension to elastically fasten the front part of the assembly. By means of its rectangular shape, it can also co-operate with standard types of dust collectors 10.
  • the shape of the assembly implies that it is guided into the cover by means of grooves 22 in the cover.
  • the rear part 23 of the cover is narrowing.
  • Fig. 7 shows the underside of the cover.
  • a flange at the cover's underside i.e. a protrusion in the cover, by means of which an even edge 26 at the cover's underside is achieved.
  • an even edge is meant that if a plane disc is placed on the flange, then the plane disc shall essentially be in contact with principally the entire U-shaped edge.
  • the flange protrudes somewhat, whereby a clearance of a few millimetres is created between the disc and the edge 21, over which the disc protrudes. Possibly the disc is parallel with the edge 21.
  • the main purpose of the edge is to enable the absorbent 28 (described below) to seal the entire aperture.
  • the flange encloses a bigger aperture consisting of a third outlet 27 out of the motor cover 20.
  • Fig. 8 shows a frontal view of the motor cover and fig. 9 a vertical cross section of the motor cover 20, depicted in fig. 6, the cross section placed in the middle of the cover.
  • the motor cover 20 When the motor cover 20 is placed in the motor housing 40, it is partly enclosed by the absorbent 28, see fig. 1 and 10.
  • the absorbent thereby fills the entire space between the edges 26 of the flange and the inside of the motor housing.
  • the absorbent sees to, by its location, that air, flowing out of the motor cover through the third outlet 27, will be forced to pass through the absorbent in a special way.
  • the absorbent is made of polyester and in original condition approximately 15 mm thick. When compressed in the motor housing it is 10 - 12 mm thick.
  • the absorbent does not have the same air permeation as the diffuser 13. The important thing is that it is sufficiently tight to reduce the air velocity and filter away noise.
  • Suitable absorbent specification is 450 grams per square metre. The airflow including results are described below in further detail.
  • a larger outlet 41 over which an outer absorbent (42 in fig. 11) is placed.
  • Fig. 12 shows a vertical cross section of the flow generator with most parts shown, such as the motor-fan assembly 11, the front suspension 30, the motor cover 20 and the motor housing 40. Furthermore a cross section of the vacuum cleaner chassis 43 is shown, in which the flow generator is arranged. The rear 12 and the outer 25 rubber bushings with accompanying brackets 24 and the diffuser 13 are missing. The airflow is illustrated by means of two arrows 44.
  • the flow paths and results as regards flow properties and noise generation are presented below:
  • the noise sources are air turbulence, vibrations in walls and directly radiated noise from the electric motor.
  • the airflow generated by the motor-fan assembly 11 begins in the vacuum cleaner nozzle and continues via the vacuum cleaner hose into the dust collector 10.
  • a cyclone separator or a vacuum cleaner bag collects the particles brought in by the airflow via the hose. Since the interior is tight when the lid is closed, no air leaks out from the interior in the ideal case. Consequently the air does not lose any energy.
  • the particle-free air flows out of the interior via the first outlet 16 and the grid 17.
  • the catastrophe filter placed before the outlet, catches some of the particles that have passed the dust collector.
  • the filter might also assist in creating laminar airflow, which is somewhat turbulent after passing through the collector 10.
  • the dust collector walls may possibly vibrate due to the airflow.
  • the air, including some noise, then flows in through the inlet 18 into the motor-fan assembly 11.
  • the front suspension 30 makes sure that no air leaks out other ways.
  • the air passes between the rotating fan blades in the assembly and then passes the electric motor. Thus the motor gets cooled.
  • the rotating fan blades add the energy that causes the air to flow.
  • the air flowing out of the assembly via outlets in its rear part is turbulent.
  • the turbulence implies that the vacuum cleaner loses suction power.
  • the air also transports the noise radiating from the assembly's motor and the fan blades.
  • the relatively laminar air from the third outlet 27 penetrates into the absorbent 28. Due to the fact that the absorbent covers the entire second outlet 27, all air will pass through the absorbent. Because the absorbent fills the entire space between the edges 26 of the flange and the inner wall of the motor housing 40, the airflow will bend 90 degrees and move in the right direction, upwards and inwards in fig. 12. Once outside the edges of the flange, where there is a free duct, the air flows out from the absorbent. The flow path of the air and the relatively large cross sectional area of the flow duct through the absorbent (the air flows in many directions) means that the inner wall of the motor housing does not vibrate due to the air flowing out of the second outlet and further lamination of the airflow.
  • the air flowing out the absorbent 28 has lower velocity, less turbulence and transports less noise than with previous solutions.
  • the absorbent implies loss of suction power.
  • An air duct with a large cross sectional area has been created in the space between the motor cover 20 and the motor housing 40.
  • the absorbent 28 is located along the inner walls of the motor housing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electric Suction Cleaners (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)

Abstract

La présente invention concerne un aspirateur comportant au moins un collecteur de poussière et un générateur de flux. Ce collecteur de poussière comprend un dispositif de collecte de particules transportées par un flux d'air (44) qui s'écoule dans le collecteur via un premier orifice d'entrée et qui en sort via un premier orifice de sortie. Ce générateur de flux comporte un second orifice d'entrée (32), à travers lequel le flux d'air allant du premier orifice de sortie s'écoule dans le générateur de flux, et un second orifice de sortie (41) à travers lequel l'air s'écoule hors du générateur de flux, ledit générateur de flux possédant aussi un dispositif de ventilateur à moteur électrique (11), un capot de moteur (20) et un logement de moteur (40). Le générateur de flux est pourvu d'au moins un troisième orifice de sortie (27) à travers lequel s'écoule principalement la globalité du flux d'air provenant du second orifice d'entrée, le troisième orifice de sortie (27) étant essentiellement recouvert par une matière hermétique (28), à travers laquelle s'écoule principalement la globalité du flux d'air provenant du troisième orifice de sortie (27).
PCT/SE2003/001154 2002-07-04 2003-07-02 Dispositif de diminution du bruit pour aspirateur WO2004004535A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE60321803T DE60321803D1 (de) 2002-07-04 2003-07-02 Lärmdämpfungsanordnung für einen staubsauger
AU2003245215A AU2003245215A1 (en) 2002-07-04 2003-07-02 Noise reduction arrangement for a vacuum cleaner
EP03738842A EP1551269B1 (fr) 2002-07-04 2003-07-02 Dispositif de diminution du bruit pour aspirateur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0202109-5 2002-07-04
SE0202109A SE0202109D0 (sv) 2002-07-04 2002-07-04 Ljuddämpande anordning för dammsugare

Publications (1)

Publication Number Publication Date
WO2004004535A1 true WO2004004535A1 (fr) 2004-01-15

Family

ID=20288448

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2003/001154 WO2004004535A1 (fr) 2002-07-04 2003-07-02 Dispositif de diminution du bruit pour aspirateur

Country Status (6)

Country Link
EP (1) EP1551269B1 (fr)
AT (1) ATE398959T1 (fr)
AU (1) AU2003245215A1 (fr)
DE (1) DE60321803D1 (fr)
SE (1) SE0202109D0 (fr)
WO (1) WO2004004535A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2877560A1 (fr) * 2004-11-05 2006-05-12 Samsung Kwangju Electronics Co Appareil d'echappement d'ensemble de moteur et aspirateur pourvu de celui-ci
WO2007045981A1 (fr) * 2005-10-21 2007-04-26 Massimiliano Pineschi Dispositif d'aspiration
CN101427894B (zh) * 2007-11-07 2012-04-18 乐金电子(天津)电器有限公司 吸尘器电机的减震降低噪音连接结构
FR2979814A1 (fr) * 2011-09-12 2013-03-15 Seb Sa Aspirateur comportant un silencieux et un diffuseur d'air
EP2907436A1 (fr) * 2014-02-18 2015-08-19 KingClean Electric Co., Ltd. Dispositif de réduction de bruit pour aspirateur
US9402517B2 (en) 2012-10-09 2016-08-02 Koninklijke Philips N.V. Exhaust grille
CN106821142A (zh) * 2015-10-30 2017-06-13 德国福维克控股公司 有隔音件的清洁设备
WO2018028740A1 (fr) * 2016-08-08 2018-02-15 Carcoustics Techconsult Gmbh Capsule insonorisante d'un bloc moteur de soufflerie d'un aspirateur, ainsi qu'aspirateur
US11033163B2 (en) * 2017-09-05 2021-06-15 Nidec Corporation Motor module and vacuum cleaner
US11452411B2 (en) 2016-02-19 2022-09-27 Samsung Electronics Co., Ltd. Robot cleaner

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011007206A1 (de) * 2011-04-12 2012-10-18 BSH Bosch und Siemens Hausgeräte GmbH Motoranordnung für ein elektromotorisch angetriebenes Haushaltsgerät
DE102011007209A1 (de) * 2011-04-12 2012-10-18 BSH Bosch und Siemens Hausgeräte GmbH Konzept zum geräuscharmen Filtern eines Abluftstroms

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0528451A1 (fr) * 1991-07-26 1993-02-24 Daewoo Electronics Co., Ltd. Aspirateur

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0528451A1 (fr) * 1991-07-26 1993-02-24 Daewoo Electronics Co., Ltd. Aspirateur

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2877560A1 (fr) * 2004-11-05 2006-05-12 Samsung Kwangju Electronics Co Appareil d'echappement d'ensemble de moteur et aspirateur pourvu de celui-ci
WO2007045981A1 (fr) * 2005-10-21 2007-04-26 Massimiliano Pineschi Dispositif d'aspiration
CN101427894B (zh) * 2007-11-07 2012-04-18 乐金电子(天津)电器有限公司 吸尘器电机的减震降低噪音连接结构
FR2979814A1 (fr) * 2011-09-12 2013-03-15 Seb Sa Aspirateur comportant un silencieux et un diffuseur d'air
US9402517B2 (en) 2012-10-09 2016-08-02 Koninklijke Philips N.V. Exhaust grille
EP2907436A1 (fr) * 2014-02-18 2015-08-19 KingClean Electric Co., Ltd. Dispositif de réduction de bruit pour aspirateur
CN106821142A (zh) * 2015-10-30 2017-06-13 德国福维克控股公司 有隔音件的清洁设备
CN106821142B (zh) * 2015-10-30 2021-06-22 德国福维克控股公司 有隔音件的清洁设备
US11452411B2 (en) 2016-02-19 2022-09-27 Samsung Electronics Co., Ltd. Robot cleaner
WO2018028740A1 (fr) * 2016-08-08 2018-02-15 Carcoustics Techconsult Gmbh Capsule insonorisante d'un bloc moteur de soufflerie d'un aspirateur, ainsi qu'aspirateur
CN109715021A (zh) * 2016-08-08 2019-05-03 卡库堤克斯科技咨询有限公司 用于容纳吸尘器的鼓风机马达单元的降低噪音的罩壳以及吸尘器
US11033163B2 (en) * 2017-09-05 2021-06-15 Nidec Corporation Motor module and vacuum cleaner

Also Published As

Publication number Publication date
EP1551269B1 (fr) 2008-06-25
EP1551269A1 (fr) 2005-07-13
DE60321803D1 (de) 2008-08-07
ATE398959T1 (de) 2008-07-15
AU2003245215A1 (en) 2004-01-23
SE0202109D0 (sv) 2002-07-04

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