FI75415C - LJUDDAEMPARE. - Google Patents
LJUDDAEMPARE. Download PDFInfo
- Publication number
- FI75415C FI75415C FI831586A FI831586A FI75415C FI 75415 C FI75415 C FI 75415C FI 831586 A FI831586 A FI 831586A FI 831586 A FI831586 A FI 831586A FI 75415 C FI75415 C FI 75415C
- Authority
- FI
- Finland
- Prior art keywords
- intermediate part
- silencer according
- covered
- intact
- air flow
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Exhaust Silencers (AREA)
- Duct Arrangements (AREA)
- Building Environments (AREA)
Description
1 75415 Äänenvaimennin1 75415 Silencer
Keksinnön kohteena on äänenvaimennin, joka on tarkoitettu tuuletuskanavia tai tuuletusi aitteita varten ja muodostuu yhdestä tai useista kanavan ilmavirtaan tai 1 aitevaippaan sovitetuista, seinää verhoavista tai Ilmavirran huuhtelemiseksi äänisuojuksiksi sovitetuista huokoisista elementeistä, jotka toimivat resistiivisinä ääntä absorboivina eliminä, jolloin yhden tai useamman huokoisen elementin ilmavirran virtaustietä pitkin olevalla pinnalla on sekä ehjän arkkimaisen aineen peittämiä alueita että vapaita tai reiällisen aineen peittämiä aiuei ta.The invention relates to a silencer for ventilation ducts or ventilation devices and consisting of one or more porous elements arranged in the duct airflow or 1 enclosure, wall cladding or airflow elements flushed to sound airflow, acting as resistive the surface along has both areas covered by an intact sheet-like substance and free or areas covered by a perforated substance.
Tällaisilla aiemmin tunnetuilla vaimentimi11 a ei yleensä ole täysin tyydyttävää pientääjuusvaimennusta. Toisenlaiset ää-nenvaimentimet, esim. kaivovaimentimet, jotka tarjoavat paremman pientaajuusvaimennuksen, ovat tunnettuja, mutta ensin mainittua tyyppiä olevat äänenvaimentlmet ovat useista muista syistä usein edullisempia.Such previously known attenuators generally do not have a completely satisfactory low frequency attenuation. Other types of mufflers, e.g. well mufflers, which provide better low frequency attenuation are known, but mufflers of the former type are often more advantageous for a number of other reasons.
Keksinnön tarkoituksena on sen tähden saada aikaan pientaajuusvaimennuksen suhteen entistä parempi, alussa mainittua tyyppiä oleva äänenvaimennin, jonka suurtaajuusvaimennus siitä huolimatta huolehtii tuuletusi aitoksissa esiintyvistä tar-peista.The object of the invention is therefore to provide an even better silencer of the type mentioned at the beginning with regard to low-frequency attenuation, the high-frequency attenuation of which nevertheless takes care of the needs of your ventilation in real rooms.
Toivottu tulos saavutetaan antamalla äänenvaimentimel1 e patenttivaatimuksesta 1 esille käyvät tunnusmerkit.The desired result is achieved by providing the muffler with the features of claim 1.
Keksinnön kahta suoritusmuotoa selitetään seuraavassa lähemmin viitaten oheiseen piirustukseen.Two embodiments of the invention will be explained in more detail below with reference to the accompanying drawing.
Kuvio 1 esittää äänenvaimenninta, joka on tarkoitettu poikkileikkaukseltaan suorakulmaiseen tuuletuskanavaan.Figure 1 shows a silencer intended for a ventilation duct with a rectangular cross-section.
Kuvio 2 esittää kuvion 1 mukaiseen äänenvaimentimeen kuuluvaa ääni suojusta.Fig. 2 shows a sound shield belonging to the muffler according to Fig. 1.
2 754152 75415
Kuviossa 1 esitetty äänenvaimennin muodostuu kuudesta ääni-suojaksi sovitetusta huokoisesta elementistä 1 ja 2 vaipassa, joka muodostuu tavallisesta, poikkileikkaukseltaan suorakulmaisesta tuuletuskanavasta. Vaippa on siis tavallisesti tehty teräsievystä. Ääni suojusten huokoinen aine on sopivasti mineraalivillaa.The muffler shown in Fig. 1 consists of six porous elements 1 and 2 arranged for sound protection in a jacket consisting of a conventional ventilation duct with a rectangular cross-section. The sheath is thus usually made of steel wire. The porous material of the sound shields is suitably mineral wool.
Kuviossa 1 esitetyssä suoritusmuodossa äänenvaimennin koostuu kolmesta äänisuojusrivistä, jotka kukin käsittävät kaksi päätä vasten sijoitettua ääni suojusta. Rivit on suunnattu ilmavirran 1äpivirtaussuuntaa pitkin. Äänisuojuksia 2 huuhte-lee ilmavirta, kun taas äänisuojukset 1 on sijoitettu kanavan vastakkaisten seinien viereen, ja ilmavirta pyyhkäisee niitä vain toiselta puolelta.In the embodiment shown in Figure 1, the muffler consists of three rows of sound shields, each comprising two sound shields placed against one end. The rows are oriented along the air flow direction 1. The sound shields 2 are flushed by the air flow, while the sound shields 1 are placed next to the opposite walls of the duct, and the air flow only sweeps them from one side.
Äänisuojuksen rakenne käy lähemmin selville kuviosta 2. Kunkin äänisuojuksen ylävirta- ja alavirtapäät 4, 5 voivat olla oleellisesti ehjän arkkiaineen, edullisesti levyn, ympäröimät, joka ulottuu kappaleen matkaa äänisuojuksen sivupintoja pitkin ilmavirran virtausrataa pitkin. Näissä sivupinnoissa on niiden oleellisen ehjän aineen 6 peittämien osien välissä vä-liosa 7, joka on vapaa tai (ei esitetty kuviossa 2) peitetty revitetyllä aineella.The structure of the sound shield is explained in more detail in Figure 2. The upstream and downstream ends 4, 5 of each sound shield may be surrounded by a substantially intact sheet material, preferably a plate, extending the distance of the body along the side surfaces of the sound shield. These side surfaces have a spacer 7 between their parts covered by a substantially intact substance 6, which is free or (not shown in Fig. 2) covered with torn material.
Tällainen rei'itetty aine voi olla rei'itettyä levyä, vetome-tallia tai sen tapaista, jossa on ainakin 20 % vapaata pinta-alaa.Such a perforated material may be a perforated plate, a tensile metal or the like having at least 20% free surface area.
Oleellisen ehjä aine 6 ulottuu sopivasti n. 2/3:n yli huokoisen elementin ulottuvuudesta L ilmavirran virtaussuunnassa tai äänen leviämisen suunnassa. Tällöin välissä oleva osa 7 on pääasiassa keskiöity pituudelle L.The substantially intact material 6 suitably extends over about 2/3 of the dimension L of the porous element in the direction of air flow or in the direction of sound propagation. In this case, the intermediate part 7 is mainly centered on the length L.
Edelleen on sopivaa, että ulottuvuus L valitaan suunnilleen 1/4 sen pientääjuuden aallonpituudesta, joka on tarkoitus vaimentaa voimakkaammin kuin mitä vaimennin itsessään mahdol-1istaa.It is further suitable that the dimension L is selected to be approximately 1/4 of the wavelength of the low frequency which is to be attenuated more strongly than the attenuator itself allows.
3 75415 Äänisuojus muodostuu kuvion 2 mukaisesti huokoisesta elementistä, joka muodostuu suorasta, suuntaissärmiön muotoisesta kappaleesta, jonka molemmissa päissä on ehjä levy 6, joka peittää elementin päädyn ja on taivutettu tämän reunojen ympäri sekä ulottuu jonkin verran ilmavirran pyyhkäisemiä elementin sivuja pitkin. Elementtien näillä sivuilla sijaitsevat levyjen 6 osat on esitetty tasaisina, jolloin niiden pääte-reunat välissä olevaa vapaata elementin osaa 7 vasten on suunnattu oleellisen suorassa kulmassa levyjen pitkiä reunoja vastaan elementin sivuja pitkin.3,75415 As shown in Figure 2, the sound shield consists of a porous element consisting of a straight, parallelepiped-shaped body with an intact plate 6 at each end covering the end of the element and bent around its edges and extending somewhat along the air-swept sides of the element. The parts of the plates 6 on these sides of the elements are shown flat, whereby their end edges against the free element part 7 of the element are directed at a substantially right angle against the long edges of the plates along the sides of the element.
Yllä parin suoritusmuodon avulla selitetty äänenvaimennin tarjoaa resistiivisen ja reaktiivisen vaimennuksen yhdistelmän mainitun osittaisen ympäröinnin ansiosta oleellisen ehjällä arkkimaisei 1 a aineella 6. Tästä on seurauksena oleellisesti parantunut pientaajuusvaimennus ilman suurtaajuusvai-mennuksen epäedullisen suurta pienennystä.The muffler described above by means of a pair of embodiments provides a combination of resistive and reactive attenuation due to said partial enclosure with a substantially intact sheet material 1a. This results in substantially improved low frequency attenuation without an unfavorably large reduction in high frequency attenuation.
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8203030A SE450656B (en) | 1982-05-14 | 1982-05-14 | Muffler for ventilation ducts or ventilation equipment |
SE8203030 | 1982-05-14 |
Publications (4)
Publication Number | Publication Date |
---|---|
FI831586A0 FI831586A0 (en) | 1983-05-09 |
FI831586L FI831586L (en) | 1983-11-15 |
FI75415B FI75415B (en) | 1988-02-29 |
FI75415C true FI75415C (en) | 1988-06-09 |
Family
ID=20346812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI831586A FI75415C (en) | 1982-05-14 | 1983-05-09 | LJUDDAEMPARE. |
Country Status (7)
Country | Link |
---|---|
DE (1) | DE3317273A1 (en) |
DK (1) | DK159669C (en) |
FI (1) | FI75415C (en) |
FR (1) | FR2526860B1 (en) |
GB (1) | GB2122256B (en) |
NO (1) | NO162931C (en) |
SE (1) | SE450656B (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3934756A1 (en) * | 1989-10-18 | 1991-04-25 | Kuehnle Kopp Kausch Ag | Noise damper for axial-flow fan - has adjacent sound absorbing chamber behind diffuser core and/or jacket transversely to flow direction |
FI91995C (en) * | 1990-11-20 | 1994-09-12 | Valmet Paper Machinery Inc | Absorptive silencer, especially for air ducts in paper mills |
EP0558472B1 (en) * | 1990-11-21 | 1998-04-08 | Sound Attenuators Limited | Improvements in attenuators |
GB2267731A (en) * | 1992-06-10 | 1993-12-15 | Lancaster Glass Fibre | Sound absorber insert for an exhaust silencer. |
SE9604664L (en) | 1996-12-19 | 1998-01-19 | Flaekt Ab | Device and method of noise reduction in a gaseous medium transport system and use of the device in a ship exhaust system |
US5801342A (en) * | 1997-01-27 | 1998-09-01 | Lindab Ab | Double-walled structure and method and arrangement for producing the same |
US6062270A (en) * | 1997-01-27 | 2000-05-16 | Lindab Ab | Double-walled structure in a ventilation duct system |
EP0897083A3 (en) * | 1997-08-14 | 2000-03-29 | Müller-BBM GmbH | Ultrasonic sound attenuator |
SE511627C2 (en) * | 1997-11-03 | 1999-11-01 | Stifab Farex Ab | Muffler baffle for rectangular vents |
SE511628C2 (en) * | 1997-11-10 | 1999-11-01 | Stifab Farex Ab | Silencer with baffles for rectangular ventilation ducts |
US6073723A (en) * | 1998-06-05 | 2000-06-13 | Gallo; Anthony | Acoustic damping material |
SE521395C2 (en) * | 1998-07-10 | 2003-10-28 | Lindab Ab | Double-wall construction in a ventilation duct system and use of a sheet metal strip |
US6543575B1 (en) | 2000-06-14 | 2003-04-08 | Lindab Ab | Double-walled structure and connection arrangement |
FI122523B (en) | 2008-04-30 | 2012-03-15 | Metso Paper Inc | Low-frequency silencer, a method for manufacturing a low-frequency silencer, and a system for low-frequency silencers, for example, in air-conditioning ducts for paper mills |
WO2014076355A1 (en) | 2012-11-15 | 2014-05-22 | Wärtsilä Finland Oy | An exhaust gas noise attenuator unit for internal combustion piston engine |
GB2519749B (en) * | 2013-10-24 | 2015-08-05 | Bentley Motors Ltd | Tyre cavity noise absorber |
GB2528950A (en) | 2014-08-06 | 2016-02-10 | Aaf Ltd | Sound suppression apparatus |
EP3610205A1 (en) * | 2017-04-14 | 2020-02-19 | Fraunhofer Gesellschaft zur Förderung der Angewand | Splitter sound attenuator assembly comprising sound-absorbing end faces |
JP6851404B2 (en) * | 2018-01-31 | 2021-03-31 | 富士フイルム株式会社 | Silent ventilation structure |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2019416B2 (en) * | 1970-04-22 | 1972-04-20 | Isoliertechnik Horst Grassmann, 6000 Frankfurt | SILENCER FOR STREAMING GASES |
GB1423986A (en) * | 1972-02-21 | 1976-02-04 | Colchester Woods | Sound attenuating units for ventilating openings |
US3776364A (en) * | 1972-04-28 | 1973-12-04 | Donaldson Co Inc | Noise reduction apparatus and method |
GB1432206A (en) * | 1973-06-29 | 1976-04-14 | Caterpillar Tractor Co | Sound attenuating engine enclosures for vehicles |
DE2513946C2 (en) * | 1975-03-29 | 1981-11-26 | Gebrüder Trox, GmbH, 4133 Neukirchen-Vluyn | Splitter silencer |
DE2630056A1 (en) * | 1975-07-30 | 1977-02-17 | Industrial Acoustics Co | SILENCER |
GB1570074A (en) * | 1977-07-13 | 1980-06-25 | British Gas Corp | Ventilators |
US4287962A (en) * | 1977-11-14 | 1981-09-08 | Industrial Acoustics Company | Packless silencer |
DE3202078A1 (en) * | 1982-01-23 | 1983-08-04 | IT - Isoliertechnik und Schallschutz GmbH, 4830 Gütersloh | Silencer |
-
1982
- 1982-05-14 SE SE8203030A patent/SE450656B/en not_active IP Right Cessation
-
1983
- 1983-05-03 GB GB08312060A patent/GB2122256B/en not_active Expired
- 1983-05-09 FR FR8307681A patent/FR2526860B1/en not_active Expired
- 1983-05-09 FI FI831586A patent/FI75415C/en not_active IP Right Cessation
- 1983-05-11 DE DE19833317273 patent/DE3317273A1/en active Granted
- 1983-05-13 NO NO831722A patent/NO162931C/en not_active IP Right Cessation
- 1983-05-13 DK DK214483A patent/DK159669C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE3317273C2 (en) | 1991-04-11 |
FI75415B (en) | 1988-02-29 |
GB2122256A (en) | 1984-01-11 |
DK159669B (en) | 1990-11-12 |
DE3317273A1 (en) | 1983-11-17 |
NO162931B (en) | 1989-11-27 |
SE450656B (en) | 1987-07-13 |
DK159669C (en) | 1991-04-15 |
FR2526860A1 (en) | 1983-11-18 |
NO162931C (en) | 1990-03-07 |
FI831586A0 (en) | 1983-05-09 |
DK214483A (en) | 1983-11-15 |
SE8203030L (en) | 1983-11-15 |
GB2122256B (en) | 1985-11-13 |
DK214483D0 (en) | 1983-05-13 |
NO831722L (en) | 1983-11-15 |
FI831586L (en) | 1983-11-15 |
GB8312060D0 (en) | 1983-06-08 |
FR2526860B1 (en) | 1989-06-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MA | Patent expired |
Owner name: AB BAHCO VENTILATION |