SE450656B - Muffler for ventilation ducts or ventilation equipment - Google Patents

Muffler for ventilation ducts or ventilation equipment

Info

Publication number
SE450656B
SE450656B SE8203030A SE8203030A SE450656B SE 450656 B SE450656 B SE 450656B SE 8203030 A SE8203030 A SE 8203030A SE 8203030 A SE8203030 A SE 8203030A SE 450656 B SE450656 B SE 450656B
Authority
SE
Sweden
Prior art keywords
air flow
intermediate portion
covered
muffler according
unbroken
Prior art date
Application number
SE8203030A
Other languages
Swedish (sv)
Other versions
SE8203030L (en
Inventor
B I Persson
Original Assignee
Bahco Ventilation Ab
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 Bahco Ventilation Ab filed Critical Bahco Ventilation Ab
Priority to SE8203030A priority Critical patent/SE450656B/en
Priority to GB08312060A priority patent/GB2122256B/en
Priority to FI831586A priority patent/FI75415C/en
Priority to FR8307681A priority patent/FR2526860B1/en
Priority to DE19833317273 priority patent/DE3317273A1/en
Priority to NO831722A priority patent/NO162931C/en
Priority to DK214483A priority patent/DK159669C/en
Publication of SE8203030L publication Critical patent/SE8203030L/en
Publication of SE450656B publication Critical patent/SE450656B/en

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

15 ZÜ 25 30 35 450 656 2 ningsrikining. Bafflarna 2 är omspolade av luftflödel medan bafflarna 1 är placerade intill varandra motstående kanal- väggar och bestrukna av luftflödet endast på en sida. 15 ZÜ 25 30 35 450 656 2 ningsrikining. The baffles 2 are flushed by air flow while the baffles 1 are placed next to each other opposite channel walls and coated by the air flow only on one side.

Uppbyggnaden av cn baffel 2 Framgår närmare av Fig. 2.The construction of cn baffle 2 is shown in more detail in Fig. 2.

Varje baffel har sina uppströms- och nedströmsändar 4, 5 om- slutna av väsentligen ogenombrutet arkmaterial 6, företrädes- vís plåt, som sträcker sig ett stycke utmed baffelns sidoytor längs luftflödets strömningsväg. Dessa sidoytor uppvisar mel- lan sina av väsentligen ogenombrutet material 6 täckta par- tier ett mellanparti 7, vilket är Fritt eller (ej visat i fig. 2) täckt av ett genombrutet material. _Sådant genombrutet material kan utgöras av perforderad plåt, slräckmetall eller liknande med minst 20 % Fri area.Each baffle has its upstream and downstream ends 4, 5 enclosed by substantially unbroken sheet material 6, preferably sheet metal, which extends a distance along the side surfaces of the baffle along the flow path of the air flow. These side surfaces have an intermediate portion 7 between their portions covered by substantially unbroken material 6, which is Free or (not shown in Fig. 2) covered by a pierced material. Such perforated material may consist of perforated sheet metal, extinguishing metal or the like with at least 20% Free area.

Det väsentligen ogenombrutna materialet 6 sträcker sig lämpligen över ca 2/3 av det porösa elementets utsträckning L i luftflödets strümningsríktning eller ljudutbredningens rikt- ning. Härvid är det mellanliggande partiet 7 i huvudsak cent- rerat på sträckan L.The substantially unbroken material 6 suitably extends over about 2/3 of the extent L of the porous element in the direction of flow of the air flow or the direction of sound propagation. In this case, the intermediate portion 7 is mainly centered on the section L.

Det är vidare lämpligt att utsträckningen L väljes omkring 1/4 av våglängden för den lågfrekvens som avses bli kraftigare dämpad än vad absorbenten i sig möjliggör.It is furthermore suitable that the extent L is chosen about 1/4 of the wavelength for the low frequency which is intended to be more strongly attenuated than the absorber itself allows.

Baffeln är enligt Fig. Z uppbyggd av ett poröst ele- ment i form av en rak, parallellepipedisk kropp som i vardera änden har en ogenombruten plåt 6 som täcker elementets gavel och är knäckt kring dennas kanter samt sträcker sig ett stycke utmed elementets av luftflödel bestrukna sidor. De på dessa elmeentsídor belägna partierna av plåtarna 6 är visade plana och utförda med sina avslutande kanter motdet mellanliggande Fria partiet 7 av elementet orienterade i väsentligen rät vin- kel mot plåtarnas långkanter utmed elementsidorna.According to Fig. Z, the baffle is built up of a porous element in the form of a straight, parallelepipedic body which at each end has an unbroken plate 6 which covers the end of the element and is broken around its edges and extends a distance along the element of air flow coated pages. The portions of the plates 6 located on these element sides are shown flat and made with their terminating edges opposite the intermediate Free portion 7 of the element oriented at a substantially right angle to the long edges of the plates along the element sides.

Den ovan beskrivna ljuddämparen erbjuder, tack vare den angivna partiella inneslutningen medelst det väsentligen ogenom- brutna arkformíga materialet 6, en kombination av resístiv och reaktiv dämpning. Resulialn! härav är en väsnnlligt för- bättrad Iäqfrckvensdämpnjnq utan ogynnsamt stor reducernng av högfrekvensdämpningen.The muffler described above offers, thanks to the indicated partial containment by means of the substantially unbroken sheet-like material 6, a combination of resistive and reactive attenuation. Resulialn! This results in a significantly improved frequency attenuation without an unfavorably large reduction in the high frequency attenuation.

Claims (6)

'VH 10 15 20 25 30 450 656 3 PATENTKRAV'VH 10 15 20 25 30 450 656 3 PATENT CLAIMS 1. Ljuddämpare avsedd att erbjuda förbättrad lågfrekvens- dämpning och inrättad för ventilationskanaier eller ventila- tionsapparater samt bestående av ett eller flera i luftflö- det i en kanal eller ett apparathölje anbringade och såsom av luftflödet omspolade bafflar anordnade porösa element (2), tjänande som resistiva ljudabsorbenter, varvid ett eller flera av de porösa elementen (2) på sina utmed luftflödets strömningsbanor förlöpande ytor uppvisar såväl av ogenom- brutet, arkformigt material (6) täckta partier som antingen Fria eller av genombrutet material täckta partier (7), k ä n n e t e c k n a d av att var och en av de nämnda ytorna i strömníngsriktningen är uppdelade i tre partier (6, 7), nämligen ett mellanparti (7), som är fritt eller täckt av det genombrutna materialet, och två till mellanpartiet (7) direkt anslutande ändpartier (6), vilka tillsammans med ele- mentets ändytor är täckta av det ogenombrulna materialet och inrättade för åstadkommande av även en för nämnda förbättrade lågfrekvensdämpning verksam reaktiv dämpning.Muffler intended to provide improved low-frequency attenuation and designed for ventilation ducts or ventilation devices and consisting of one or more porous elements (2) arranged in the air flow in a duct or an apparatus housing and arranged as baffles flushed by the air flow, serving as resistive sound absorbers, one or more of the porous elements (2) on their surfaces extending along the airflow flow paths having portions covered by unbroken, sheet-like material (6) as well as either Free or perforated material covered parts (7), characterized in that each of the said surfaces in the direction of flow is divided into three portions (6, 7), namely an intermediate portion (7), which is free or covered by the pierced material, and two end portions directly adjoining the intermediate portion (7) (6), which together with the end surfaces of the element are covered by the unbroken material and arranged to provide also a for said for improved low frequency attenuation effective reactive attenuation. 2. Ljuddämpare enligt patentkravet 1, k ä n n e t e ck- n a d av att mellanpartíet (7) är täckt av perforerad plåt, sträckmetall eller liknande med minst 20 % fri area.A muffler according to claim 1, characterized in that the intermediate portion (7) is covered by perforated sheet, expanded metal or the like with at least 20% free area. 3. Ljuddämpare enligt patentkravet 1 eller 2, k ärn n e- t e c k n a d över c:a 2/3 av det porösa elementets (2) utsträckning av att det ogenombrutna materialet (6) sträcker sig (L) i luftflödets strömningsriktningeller ljudutbredningens riktning och att det mellanliggande partiet (7) är i huvudsak centrerat i Förhållande till det porösa elementets (2) nämnda utsträckning (L). k ä n n e t e c k-A muffler according to claim 1 or 2, characterized in about 2/3 of the extent of the porous element (2) that the unbroken material (6) extends (L) in the direction of flow of the air flow or the direction of sound propagation and that the intermediate portion (7) is substantially centered in relation to the said extent of the porous element (2) (L). k ä n n e t e c k- 4. Ljuddämpare enligt patentkravet 3, n a d av att det porösa elementels (2) nämnda utsträckning (L) utgör omkring 1/4 av våglängden för den lågfrekvens som avses bli kraftigare dampad än vad absorbenten i sig möjlig- gör.A muffler according to claim 3, characterized in that said extent (L) of the porous element (2) constitutes about 1/4 of the wavelength of the low frequency which is intended to be more strongly steamed than the absorber itself allows. 5. Ljuddämpare enligl något av palenlkraven 1 - 4, av att k ä n n e t e 0 k n a d det ogenombrulna materialet (6) i vardera änden av respektive porösa elemenl (2) utgöres av en plät, som täcker elementets (2) gavelände och är knäckt 450 656 4 kring två mntstående av dennas kanter, fiir att sträcka sig även utmed elementets av luftflödet bestrukna båda sidor.A muffler according to any one of claims 1 to 4, in that the known unbroken material (6) at each end of the respective porous elements (2) consists of a plate which covers the end of the element (2) and is cracked 450 656 4 around two mintstands of its edges, to extend also along both sides of the element coated by the air flow. 6. _ Ljuddämpare enligt patentkravet 5, k ä n n e t e c k- n a d av att vardera gaveländens plåt (6) utmed den av luft- flödet bestrukna sidan är plan och väsentligen rätvinkligt avslutad mot det nämnda mellanliggande partiet (7).A muffler according to claim 5, characterized in that each plate end plate (6) along the side coated by the air flow is flat and substantially perpendicularly terminated towards said intermediate portion (7).
SE8203030A 1982-05-14 1982-05-14 Muffler for ventilation ducts or ventilation equipment SE450656B (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
SE8203030A SE450656B (en) 1982-05-14 1982-05-14 Muffler for ventilation ducts or ventilation equipment
GB08312060A GB2122256B (en) 1982-05-14 1983-05-03 Silencing in ventilation ducts
FI831586A FI75415C (en) 1982-05-14 1983-05-09 LJUDDAEMPARE.
FR8307681A FR2526860B1 (en) 1982-05-14 1983-05-09 NOISE ABSORBER
DE19833317273 DE3317273A1 (en) 1982-05-14 1983-05-11 MUFFLER
NO831722A NO162931C (en) 1982-05-14 1983-05-13 MUFFLER.
DK214483A DK159669C (en) 1982-05-14 1983-05-13 MUFFLER

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 (2)

Publication Number Publication Date
SE8203030L SE8203030L (en) 1983-11-15
SE450656B true SE450656B (en) 1987-07-13

Family

ID=20346812

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8203030A SE450656B (en) 1982-05-14 1982-05-14 Muffler for ventilation ducts or ventilation equipment

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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0916906A2 (en) * 1997-11-10 1999-05-19 Stifab Farex AB A sound absorber for ventilation ducts
EP0921358A2 (en) * 1997-11-03 1999-06-09 Stifab Farex AB A baffel for sound absorbers

Families Citing this family (17)

* Cited by examiner, † Cited by third party
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
US6062270A (en) * 1997-01-27 2000-05-16 Lindab Ab Double-walled structure in a ventilation duct system
US5801342A (en) * 1997-01-27 1998-09-01 Lindab Ab Double-walled structure and method and arrangement for producing the same
EP0897083A3 (en) * 1997-08-14 2000-03-29 Müller-BBM GmbH Ultrasonic sound attenuator
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
WO2018188762A1 (en) * 2017-04-14 2018-10-18 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. 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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0921358A2 (en) * 1997-11-03 1999-06-09 Stifab Farex AB A baffel for sound absorbers
EP0921358A3 (en) * 1997-11-03 1999-06-23 Stifab Farex AB A baffel for sound absorbers
EP0916906A2 (en) * 1997-11-10 1999-05-19 Stifab Farex AB A sound absorber for ventilation ducts
EP0916906A3 (en) * 1997-11-10 1999-06-23 Stifab Farex AB A sound absorber for ventilation ducts

Also Published As

Publication number Publication date
NO162931B (en) 1989-11-27
FR2526860B1 (en) 1989-06-16
DK159669C (en) 1991-04-15
NO831722L (en) 1983-11-15
GB2122256A (en) 1984-01-11
DK214483A (en) 1983-11-15
DK214483D0 (en) 1983-05-13
DE3317273A1 (en) 1983-11-17
DE3317273C2 (en) 1991-04-11
FI75415B (en) 1988-02-29
DK159669B (en) 1990-11-12
GB2122256B (en) 1985-11-13
FI831586L (en) 1983-11-15
GB8312060D0 (en) 1983-06-08
NO162931C (en) 1990-03-07
FI75415C (en) 1988-06-09
SE8203030L (en) 1983-11-15
FI831586A0 (en) 1983-05-09
FR2526860A1 (en) 1983-11-18

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