WO2001074025A9 - A silencer for an air flow generator - Google Patents
A silencer for an air flow generator Download PDFInfo
- Publication number
- WO2001074025A9 WO2001074025A9 PCT/DK2001/000201 DK0100201W WO0174025A9 WO 2001074025 A9 WO2001074025 A9 WO 2001074025A9 DK 0100201 W DK0100201 W DK 0100201W WO 0174025 A9 WO0174025 A9 WO 0174025A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- air flow
- air
- silencer
- housing
- flow
- Prior art date
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
- A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
Definitions
- the present invention relates to a silencer according to the preamble of claim 1, comprising a motor housing that delimits a volume which extends at least radially around the air flow generator, said housing having a wall member extending in a generally axial direction and that is provided with at least one air inlet flow passage and at least one air outlet flow passage.
- the invention further relates to a method of reducing noise emission according to the preamble of claim 10.
- WO-A-97/134 3 discloses a silencer for a vacuum cleaner of the above mentioned kind where the air flow generator is enclosed in a housing with an air inlet and an air outlet. The housing and the outlet is provided with sound absorbing foamed plastics material.
- EP-A-0 099 466 Another solution to the noise reduction problem is known from EP-A-0 099 466, in which a vacuxun cleaner is disclosed.
- This vacuum cleaner is provided with sound absorbing foam material around the motor housing and around the inlet and outlet passages that are lined with sound absorbing material.
- the outlet passages in this vacuum cleaner are designed with several changes in cross-section areas and with bends in order to provide changes in the acoustical properties that lead to reflections of the noise.
- the vacuum cleaner is moreover with a damper in front of the air inlet.
- a silencer according to the initially mentioned kind, wherein at least one of said flow passages includes at least one folded elongated flow channel that is integrally formed in the wall member of the motor housing.
- a silencer By a silencer according to the invention, it is reahsed that the noise emission from air flow generators can be controlled by creating a relatively large volume around the air flow generator where this volume communicates with the outside through a long slim air flow channel.
- This principle of noise reduction is obtained by applying the principle of a Helmholz resonator. According to this principle, the system acts as a damping system where the air of the volume acts as a spring and the air in the channel as a mass.
- the length and cross-section area of the channel and the size of the volume of the housing can be chosen in accordance with the actual noise reduction requirements.
- noise at frequencies somewhat above the resonance frequency of the system is reduced without the use of sound absorbing foam material. It is no longer advantageous to reduce the volume of the motor housing in order to have a closely fitting sound absorption and/or to fill it with sound absorbing materials.
- the resonance frequency of the system is lowered by providing a relatively large volume of the housing comprising a relatively long and narrow channel.
- a plane wave condition is of preference.
- the plane wave condition can be obtained in the channel by the provision of ribs that are dividing the channel into a plurality of channels with smaller cross section dimensions.
- the invention contrary to the designs of the prior art silencers it is of preference to provide the channels with substantially the same opening through the system in order to keep the air velocity constant and hence the pressure loss low.
- a relatively long and compact channel is provided compared to the volume of the housing.
- This allows for a compact design of the silencer by integrating it into the motor housing, this in turn means that a compact design of the appliance in which the silencer is to be used can be obtained; just as an efficient means of noise reduction is obtainable having the same or even a superior silencing effect compared to the silencers known in the art.
- a silencer according to the invention a relatively simple structure is obtained that is easy and inexpensive to manufacture.
- the elongated flow channel exhibits successive duct portions with altering flow directions, and air flow bending portions between said portions. This allows for a particular compact arrangement of the channel in the wall member and a compact design of the housing.
- the successive duct portions have a gradual increase in radial position in the motor housing.
- a particular long yet compact channel is created by arranging the duct portions in annular or semi-annular configurations outside each other.
- the air flow bending portions is a 180° bend including an end wall that is generally orthogonal to the flow directions of two successive duct portions and that a connecting passage is provided between the two successive duct portions.
- a further noise reducing effect is obtained, since a wave of noise coming towards the end wall of the bend is reflected back into the duct portion. This can produce an interfering wave diminishing the noise transmitted into the successive duct portion.
- this additional noise reducing effect is particularly significant.
- sharp bends in air flow passages do not necessarily result in a noise increase and pressure loss providing that the air velocity is kept low.
- the wall member of the motor housing comprises a number of concentric shells with annular or semi-annular interior spaces between said shells defining the ducts.
- a particularly simple design of the housing is provided which is easy and inexpensive to manufacture since all the components can be produced by injection moulding.
- each of the duct portions is having an annular-shaped cross-section.
- the housing can be formed by the use of concentric cylindrical wall member components that can easily be produced e.g. in a plastic material by injection moulding.
- the at least one flow channel constitutes the air outlet flow passage of the housing.
- the silencer is required at the outlet.
- the invention could be used for other purposes such as a hair dryer, a cooker hood or other appliances making use of air flow generation.
- the air outlet flow passage is provided with a filter upstream the flow channel at the beginning of the outlet passage.
- a filter upstream the flow channel at the beginning of the outlet passage.
- fig. 1 shows a schematical, principle view explaining the general principle of the noise reduction in a silencer according to the invention by applying the principle of a Helmholz resonator
- fig. 2 is a graphic representation of the noise reduction characteristics of such resonator
- fig. 3 is a schematic representation of a silencer according to the invention
- fig. 3a is a detail thereof
- fig. 4 is a cross section view of an embodiment of a silencer according to the invention.
- the principle of a Helmholz resonator is used for silencing an air flow generator consisting of a motor with a blower in a vacuum cleaner.
- the housing 1 defines a volume N around the air flow generator 2.
- the air flow generator comprises a motor 2a and a blower 2b.
- An air inlet 4 and an air outlet 3 is provided in the housing.
- utility air such as air for cooling the motor, is sucked in through the inlet and through the air flow generator 2 and into the volume V.
- This constant air flow of a relatively high speed creates noise in the housing volume V.
- this silencing principle is adapted for use as a silencer in a vacuum cleaner, such as shown in a principle view in fig. 3.
- the channel 3 is bend or folded around the wall of the housing 1 whereby the same effect is obtained with regard to the long, narrow channel 3.
- the channel or channels 3 comprise a successive duct portions 3a and 3b that communicates with each other through a bend portion 3c of the channel(s) 3. In the bend 3c, the flow direction is reversed.
- the duct portions 3a, 3b are created by providing the housing 1 with a wall member having a multiple wall structure with wall sections la, lb, lc and an end wall section Id.
- FIG 4 is shown an air flow generator installation for a vacuum cleaner having a silencer according to the invention.
- the channel 3 is formed in the wall structure la, lb, lc of the housing 1.
- the channel 3 has in this embodiment a serpentine-like shape in a radial cross section view.
- the channel 3 in this embodiment is formed by three concentric shells la, lb, lc defining the interior duct passages 3a and 3b.
- the shells la-lc are formed in such a way that flow communication passages at the bends 3c are formed.
- the duct portions 3a and 3b are in this embodiment annular in shape with an increase in diameter for each subsequent duct portion 3b. In the embodiment shown, three shells are present whereby two duct portions are created, however, if appropriate any number of shells can be used, e.g. to provide a longer channel.
- the duct portions 3a, 3b are not annular in shape but rather semi-circular. More general, it is by the invention realised that several designs of the outlet channel geometry can be created without departing from the scope of the invention as defined in the accompanying claims.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Duct Arrangements (AREA)
- Exhaust Silencers (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Exhaust Gas After Treatment (AREA)
- Motor Or Generator Cooling System (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Electric Suction Cleaners (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01915117A EP1266501B1 (en) | 2000-03-24 | 2001-03-23 | A silencer for an air flow generator |
DE60105272T DE60105272T2 (en) | 2000-03-24 | 2001-03-23 | A SILENCER FOR AN AIRFLOW GENERATOR |
AU4231701A AU4231701A (en) | 2000-03-24 | 2001-03-23 | A silencer for an air flow generator |
AU2001242317A AU2001242317B2 (en) | 2000-03-24 | 2001-03-23 | A silencer for an air flow generator |
AT01915117T ATE275311T1 (en) | 2000-03-24 | 2001-03-23 | A SILENCER FOR AN AIRFLOW GENERATOR |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA200000509 | 2000-03-24 | ||
DKPA200000509 | 2000-03-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001074025A1 WO2001074025A1 (en) | 2001-10-04 |
WO2001074025A9 true WO2001074025A9 (en) | 2001-12-20 |
Family
ID=8159379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DK2001/000201 WO2001074025A1 (en) | 2000-03-24 | 2001-03-23 | A silencer for an air flow generator |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1266501B1 (en) |
AT (1) | ATE275311T1 (en) |
AU (2) | AU4231701A (en) |
DE (1) | DE60105272T2 (en) |
DK (1) | DK1266501T3 (en) |
ES (1) | ES2227159T3 (en) |
WO (1) | WO2001074025A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7475449B2 (en) | 2003-12-24 | 2009-01-13 | Daewoo Electronics Corporation | Vacuum cleaner |
KR100555205B1 (en) * | 2003-12-31 | 2006-03-03 | 삼성광주전자 주식회사 | Vacuum cleaner |
US7721384B2 (en) * | 2005-08-25 | 2010-05-25 | Shop-Vac Corporation | Pneumatic cleaner |
CN104519779B (en) * | 2012-07-04 | 2016-09-14 | 力奇有限公司 | The muffler system of the vacuum motor in vacuum cleaner |
CN108366704A (en) * | 2015-12-04 | 2018-08-03 | 伊莱克斯公司 | Vacuum cleaner |
FR3046046B1 (en) | 2015-12-23 | 2017-12-22 | Seb Sa | GEOMETRY OF AERAULIC CIRCUIT FOR A HAND VACUUM |
US10309302B2 (en) | 2016-03-09 | 2019-06-04 | Kohler Co. | Noise suppression system |
DE102017206360B4 (en) * | 2017-04-13 | 2022-05-19 | Conti Temic Microelectronic Gmbh | Housing for a pneumatic control unit and pneumatic control unit |
DE102018126736A1 (en) * | 2018-10-26 | 2020-04-30 | Miele & Cie. Kg | Blower capsule device for reducing noise for a blower, blower system with a blower capsule device, and method for manufacturing a blower system |
EP4233660A1 (en) * | 2022-02-23 | 2023-08-30 | Versuni Holding B.V. | Noise reduction in a vacuum cleaner unit |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7514249U (en) * | 1975-05-02 | 1976-04-08 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Soundproof device for vacuum cleaners |
JPS5235475A (en) * | 1975-09-16 | 1977-03-18 | Tokyo Electric Co Ltd | Electric cleaner |
US4280245A (en) * | 1980-02-19 | 1981-07-28 | Shop-Vac Corporation | Sound dome for electric vacuum cleaner |
DE3225258C2 (en) * | 1982-07-06 | 1985-11-28 | Guido Oberdorfer Wap-Maschinen, 7919 Bellenberg | Vacuum cleaner |
DE3904392A1 (en) * | 1989-02-14 | 1990-08-16 | Mauz & Pfeiffer Progress | VACUUM CLEANER |
JPH0549561A (en) * | 1991-08-22 | 1993-03-02 | Matsushita Electric Ind Co Ltd | Cleaner |
US5353469A (en) * | 1992-07-01 | 1994-10-11 | National Super Service Company | Wet/dry vacuum cleaner with noise reducing housing structure |
AU707268B2 (en) * | 1995-10-10 | 1999-07-08 | Nilfisk A/S | A silencer for a suction cleaner |
KR100190684B1 (en) * | 1996-05-17 | 1999-06-01 | 전주범 | Muffler chamber system of vacuum cleaner |
-
2001
- 2001-03-23 AU AU4231701A patent/AU4231701A/en active Pending
- 2001-03-23 DK DK01915117T patent/DK1266501T3/en active
- 2001-03-23 EP EP01915117A patent/EP1266501B1/en not_active Expired - Lifetime
- 2001-03-23 AT AT01915117T patent/ATE275311T1/en not_active IP Right Cessation
- 2001-03-23 AU AU2001242317A patent/AU2001242317B2/en not_active Ceased
- 2001-03-23 WO PCT/DK2001/000201 patent/WO2001074025A1/en active IP Right Grant
- 2001-03-23 ES ES01915117T patent/ES2227159T3/en not_active Expired - Lifetime
- 2001-03-23 DE DE60105272T patent/DE60105272T2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2227159T3 (en) | 2005-04-01 |
WO2001074025A1 (en) | 2001-10-04 |
DK1266501T3 (en) | 2004-09-20 |
DE60105272D1 (en) | 2004-10-07 |
DE60105272T2 (en) | 2005-09-15 |
EP1266501B1 (en) | 2004-09-01 |
ATE275311T1 (en) | 2004-09-15 |
EP1266501A1 (en) | 2002-12-18 |
AU2001242317B2 (en) | 2004-11-11 |
AU4231701A (en) | 2001-10-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6009705A (en) | Noise attenuator for an induction system or an exhaust system | |
US6158546A (en) | Straight through muffler with conically-ended output passage | |
EP1266501B1 (en) | A silencer for an air flow generator | |
US6094774A (en) | Silencer for a suction cleaner | |
US4150732A (en) | Resonant cavity devices for reducing noise within a duct in the presence of a gaseous fluid | |
US6415887B1 (en) | Refractive wave muffler | |
JP4437265B2 (en) | Air introduction assembly with integrated mass airflow sensor and broadband silencer | |
AU2001242317A1 (en) | A silencer for an air flow generator | |
US20080023265A1 (en) | Combination Silencer | |
US20020029927A1 (en) | Air intake device comprising a duct section provided with openings | |
WO2002005697A1 (en) | A suction apparatus with noise reducion means | |
AU2001270480A1 (en) | A Suction Apparatus with Noise Reduction Means | |
GB2045860A (en) | Silencers for internal combustion engines | |
EP0704617A1 (en) | Acoustic absorber | |
CN213282700U (en) | Drying device of electronic toilet | |
CN115111201A (en) | Wind-guiding circle reaches axial fan including it | |
CN112460071B (en) | Noise-reduction volute tongue, volute, fan and range hood | |
CN212835735U (en) | Air outlet structure of electronic toilet bowl drying device and drying device | |
CN117242515A (en) | Noise reduction for air flow equipment | |
EP1680578A1 (en) | Muffler for vehicle | |
RU185888U1 (en) | HAIR DRYER | |
CN111520229A (en) | Acoustic wave resonator | |
CN216950913U (en) | Centrifugal fan and air conditioner | |
CN220124610U (en) | Noise reduction device and dust collector | |
CN220655481U (en) | Noise reduction device and dust collector |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ CZ DE DE DK DK DM DZ EE EE ES FI FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
AK | Designated states |
Kind code of ref document: C2 Designated state(s): AE AG AL AM AT AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ CZ DE DE DK DK DM DZ EE EE ES FI FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: C2 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
COP | Corrected version of pamphlet |
Free format text: INTERNATIONAL SEARCH REPORT, ADDED, (3 PAGES) |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2001242317 Country of ref document: AU |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2001915117 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2001915117 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 2001915117 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: JP |
|
WWG | Wipo information: grant in national office |
Ref document number: 2001242317 Country of ref document: AU |