NO162931B - MUFFLER. - Google Patents
MUFFLER. Download PDFInfo
- Publication number
- NO162931B NO162931B NO831722A NO831722A NO162931B NO 162931 B NO162931 B NO 162931B NO 831722 A NO831722 A NO 831722A NO 831722 A NO831722 A NO 831722A NO 162931 B NO162931 B NO 162931B
- Authority
- NO
- Norway
- Prior art keywords
- covered
- intermediate part
- air flow
- silencer according
- aforementioned
- Prior art date
Links
- 230000003584 silencer Effects 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 238000009423 ventilation Methods 0.000 claims description 8
- 239000006096 absorbing agent Substances 0.000 claims description 4
- 238000013016 damping Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 2
- 230000002745 absorbent Effects 0.000 claims 1
- 239000002250 absorbent Substances 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 239000011490 mineral wool Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
Denne oppfinnelse vedrører en lyddemper som er innrettet for ventilasjonskanaler eller ventilasjonsapparater og består av ett eller flere i luftstrømmen i en kanal eller et apparathus anbragte, vegginnkledende eller som av luftstrømmen omspylte baf-fler anordnede porøse elementer av f.eks. mineralull som tjener som resistiv lydabsorbent. This invention relates to a silencer which is designed for ventilation ducts or ventilation devices and consists of one or more porous elements arranged in the air flow in a duct or an appliance housing, wall covering or as baffles swept around by the air flow, of e.g. mineral wool that serves as a resistive sound absorber.
Tidligere kjente dempere av denne art har en i alminnelig-het ikke helt tilfredsstillende lav frekvensdempning. Lyddempere av andre typer, f.eks. membranabsorbenter som byr på bedre lavfrekvensdempning, er kjent, men lyddempere av den førstnevnte art er av flere grunner ofte å foretrekke. Previously known attenuators of this type generally have a not entirely satisfactory low-frequency attenuation. Silencers of other types, e.g. membrane absorbers that offer better low-frequency damping are known, but silencers of the former kind are often preferable for several reasons.
Hensikten med oppfinnelsen er derfor å tilveiebringe en med henseende på lavfrekvensdempning forbedret lyddemper av den inn-ledningsvis nevnte art, hvis høyfrekvensdempning tilgodeser et i ventilasjonsinstallasjoner foreliggende behov. The purpose of the invention is therefore to provide an improved silencer of the type mentioned at the outset with respect to low-frequency attenuation, whose high-frequency attenuation meets a need present in ventilation installations.
Det ønskede resultat fås ved at lyddemperen gis de karakte-ristiske trekk som fremgår av det etterfølgende patentkrav 1. The desired result is obtained by giving the muffler the characteristic features that appear in the following patent claim 1.
To utførelsesformer av oppfinnelsen skal beskrives nærmere Two embodiments of the invention will be described in more detail
i det følgende under henvisning til den medfølgende tegning, hvor: Fig. 1 viser en lyddemper som er innrettet for en ventilasjonskanal med rektangulært kanaltverrsnitt, Fig. 2 viser en i lyddemperen inngående baffel eller patron, in the following with reference to the accompanying drawing, where: Fig. 1 shows a silencer which is designed for a ventilation duct with a rectangular duct cross-section, Fig. 2 shows a baffle or cartridge included in the silencer,
og and
Fig. 3 viser en ytterligere lyddemper som er innrettet for en ventilasjonskanal med sirkulært kanaltverrsnitt. Fig. 3 shows a further silencer which is designed for a ventilation duct with a circular duct cross-section.
Den på fig. 1 viste lyddemper består av seks i form av baf-fler eller lydskjermer anordnede porøse elementer 1 og 2 i et hus som utgjøres av en vanlig ventilasjonskanal med rektangulært tverrsnitt. Huset er således vanligvis utført av stålplate. Skjermenes porøse materiale utgjøres hensiktsmessig av mineralull. The one in fig. The silencer shown in 1 consists of six porous elements 1 and 2 arranged in the form of baffles or sound screens in a housing which consists of a normal ventilation duct with a rectangular cross-section. The house is therefore usually made of sheet steel. The screens' porous material is suitably made up of mineral wool.
I den på fig. 1 viste utførelsesform er lyddemperen sammen-satt av tre rader skjermer omfattende hver og én to ende mot ende stilte skjermer. Radene er orientert langsmed luftstrøm-mens gjennomstrømningsretning. Skjermene 2 er omspylt av luft-strømmen mens skjermene 1 er plassert inntil hverandre ved motstående kanalvegger og omspyles av luftstrømmen bare på én side. In the one in fig. In the embodiment shown in 1, the silencer is composed of three rows of screens each comprising two end-to-end screens. The rows are oriented along the airflow direction. The screens 2 are flushed by the air flow, while the screens 1 are placed next to each other at opposite channel walls and are flushed by the air flow only on one side.
Oppbygningen av en skjerm fremgår nærmere fra fig. 2. Hver skjerm har sine oppstrøms- og nedstrømsender 4, 5 som er omsluttet av i det vesentlige ugjennombrutt arkmateriale 6, fortrinns-vis plater som strekker seg et stykke langsmed skjermens side-flate langs luftstrømmens strømningsvegg. Disse sideflater har mellom sine i det vesentlige ugjennombrutt materiale 6 dekkede partier et mellomparti 7 som er fritt eller (ikke vist på fig. The structure of a screen can be seen in more detail from fig. 2. Each screen has its upstream and downstream ends 4, 5 which are enclosed by essentially unbroken sheet material 6, preferably plates which extend a distance along the side surface of the screen along the flow wall of the air stream. These side surfaces have between their essentially unbroken material 6 covered parts an intermediate part 7 which is free or (not shown in fig.
2) dekket med et gjennombrutt materiale. 2) covered with an openwork material.
Sådant gjennombrutt materiale kan utgjøres av perforert plate, strekkmetall eller lignende med minst 20% fritt areal. Such perforated material can consist of perforated plate, expanded metal or the like with at least 20% free area.
Det i det vesentlige ugjennombrutte materiale 6 strekker seg hensiktsmessig over ca. 2/3 av det porøse elements utstrekning L i luftstrømmens strømningsretning eller lydutbredelsens utbredelsesretning. Her er det mellomliggende parti 7 hovedsakelig sentrert på strekningen L. The essentially unbroken material 6 appropriately extends over approx. 2/3 of the porous element's extent L in the flow direction of the air stream or the direction of propagation of the sound propagation. Here, the intermediate part 7 is mainly centered on the stretch L.
Det er videre hensiktsmessig at strekningen L velges til omtrent 1/4 av bølgelengden for den lavfrekvens som ønskes å få dempet kraftigere enn hva absorbenten i seg selv muliggjør. It is also appropriate that the length L is chosen to be approximately 1/4 of the wavelength for the low frequency that is desired to be attenuated more strongly than the absorber itself enables.
Skjermen er ifølge fig. 2 bygget opp av et porøst element The screen is according to fig. 2 built up of a porous element
i form av et rett, parallellepipedisk legeme som i hver ende har en ugjennombrutt plate 6 som dekker elementets gavl eller ende og er brettet rundt dennes kanter og strekker seg et stykke langsmed elementets sider som bestrykes av luftstrømmen. De på disse elementsider beliggende partier av platene 6 er vist plane og utført med sine avsluttende kanter mot det mellomliggende frie parti 7 av elementet orientert i det vesentlige i rett vin-kel på platenes lengdekanter langsmed elementsiden. in the form of a straight, parallelepiped body which at each end has an unbroken plate 6 which covers the gable or end of the element and is folded around its edges and extends for a distance along the sides of the element which are coated by the air flow. The parts of the plates 6 located on these element sides are shown flat and made with their terminating edges towards the intermediate free part 7 of the element oriented essentially at right angles to the longitudinal edges of the plates along the element side.
Fig. 3 viser en lyddemper med et ytre, ugjennombrutt, sy-lindermantelformet hus 8, f.eks. av plate, og et sentralt med huset koaksialt og gjennombrutt rør 9 som utgjør passasjen for luftstrømmen. Mellomrommet mellom huset 8 og røret 9 er utfylt av det i dette tilfelle sylindermantelformede og bare veggbekle-dende porøse element 3. Fig. 3 shows a silencer with an outer, unbroken, cylindrical shell-shaped housing 8, e.g. of plate, and a central coaxial with the housing and perforated tube 9 which forms the passage for the air flow. The space between the housing 8 and the pipe 9 is filled by the porous element 3, which in this case is cylinder-mantle-shaped and only covers the wall.
Det ovenfor i redegjørelsen for den første utførelsesform ifølge fig. 1 og 2 beskrevne mellomparti 7, utgjøres i dette tilfelle av det gjennombrutte partiet av røret 9. Dette gjennombrutte parti kan være avgrenset f.eks. ved at røret forøvrig, dvs. oppstrøms-og nedstrømspartiet 7 er ugjennombrutt eller ved at røret i hele sin lengde er utført gjennombrutt, men oppstrøms-og nedstrømspartiet 7 har sine vegger avskjermet med i det vesentlige ugjennombrutt materiale, såsom i røret 9 innskutte stus-ser eller ender av tilsluttende kanaler. The above in the explanation of the first embodiment according to fig. 1 and 2 described intermediate part 7, is in this case constituted by the broken-through part of the pipe 9. This broken-through part can be delimited, e.g. by the fact that the pipe otherwise, i.e. the upstream and downstream part 7, is unbroken or by the fact that the pipe is made through through its entire length, but the upstream and downstream part 7 have their walls shielded with essentially unbroken material, such as plugs cut into the pipe 9 see or end of connecting channels.
Den ovenfor ved hjelp av et par utførelsesformer beskrevne lyddemper gir, takket være den angitte partielle inneslutningen ved hjelp av det i det vesentlige ugjennombrutte arkformede materiale 6, en kombinasjon av resistiv og reaktiv dempning. Resul-tatet derav er vesentlig forbedret lavfrekvensdempning uten util-børlig stor reduksjon av høyfrekvensdempningen. The silencer described above by means of a couple of embodiments provides, thanks to the stated partial containment by means of the essentially unbroken sheet-shaped material 6, a combination of resistive and reactive damping. The result is significantly improved low-frequency attenuation without an unduly large reduction in high-frequency attenuation.
Claims (6)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8203030A SE450656B (en) | 1982-05-14 | 1982-05-14 | Muffler for ventilation ducts or ventilation equipment |
Publications (3)
Publication Number | Publication Date |
---|---|
NO831722L NO831722L (en) | 1983-11-15 |
NO162931B true NO162931B (en) | 1989-11-27 |
NO162931C NO162931C (en) | 1990-03-07 |
Family
ID=20346812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO831722A NO162931C (en) | 1982-05-14 | 1983-05-13 | MUFFLER. |
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. |
SE506618C2 (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 |
CN110770511A (en) * | 2017-04-14 | 2020-02-07 | 弗劳恩霍夫应用研究促进协会 | Split muffler assembly with sound absorbing end sides |
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 FI FI831586A patent/FI75415C/en not_active IP Right Cessation
- 1983-05-09 FR FR8307681A patent/FR2526860B1/en not_active Expired
- 1983-05-11 DE DE19833317273 patent/DE3317273A1/en active Granted
- 1983-05-13 DK DK214483A patent/DK159669C/en not_active IP Right Cessation
- 1983-05-13 NO NO831722A patent/NO162931C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
NO831722L (en) | 1983-11-15 |
NO162931C (en) | 1990-03-07 |
GB2122256A (en) | 1984-01-11 |
SE450656B (en) | 1987-07-13 |
FI75415B (en) | 1988-02-29 |
DE3317273C2 (en) | 1991-04-11 |
DK214483A (en) | 1983-11-15 |
FI75415C (en) | 1988-06-09 |
DK159669B (en) | 1990-11-12 |
GB2122256B (en) | 1985-11-13 |
FI831586L (en) | 1983-11-15 |
FR2526860A1 (en) | 1983-11-18 |
DE3317273A1 (en) | 1983-11-17 |
SE8203030L (en) | 1983-11-15 |
FI831586A0 (en) | 1983-05-09 |
DK214483D0 (en) | 1983-05-13 |
FR2526860B1 (en) | 1989-06-16 |
DK159669C (en) | 1991-04-15 |
GB8312060D0 (en) | 1983-06-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MK1K | Patent expired |
Free format text: EXPIRED IN MAY 2003 |