SE8203030L - LJUDDEMPARE - Google Patents

LJUDDEMPARE

Info

Publication number
SE8203030L
SE8203030L SE8203030A SE8203030A SE8203030L SE 8203030 L SE8203030 L SE 8203030L SE 8203030 A SE8203030 A SE 8203030A SE 8203030 A SE8203030 A SE 8203030A SE 8203030 L SE8203030 L SE 8203030L
Authority
SE
Sweden
Prior art keywords
sections
covered
sheet metal
sound
length
Prior art date
Application number
SE8203030A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE450656B (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 DK214483A priority patent/DK159669C/en
Priority to NO831722A priority patent/NO162931C/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)

Abstract

Each of the sections of sound- absorbing material, e.g. mineral wool, forming a wall covering and/or a baffle extending in the direction of air flow in a rectangular or circular duct (Figs. 1 and 3) is covered by unperforated material 6, e.g. sheet metal, at its upstream and downstream end regions 4 and 5 and an intermediate portion 7 is uncovered or covered by expanded or perforated sheet metal with an aperture area of at least 20%. The sections of material may each have a length L equal to one quarter of the wave length of the sound frequency to be most silenced. <IMAGE>
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
DK214483A DK159669C (en) 1982-05-14 1983-05-13 MUFFLER
NO831722A NO162931C (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 true SE8203030L (en) 1983-11-15
SE450656B 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)

Families Citing this family (19)

* 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
WO1992009988A1 (en) * 1990-11-21 1992-06-11 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
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

Also Published As

Publication number Publication date
NO162931B (en) 1989-11-27
SE450656B (en) 1987-07-13
DK159669C (en) 1991-04-15
FI75415B (en) 1988-02-29
DK214483D0 (en) 1983-05-13
GB2122256B (en) 1985-11-13
DK159669B (en) 1990-11-12
FI831586L (en) 1983-11-15
FI831586A0 (en) 1983-05-09
FR2526860B1 (en) 1989-06-16
DE3317273A1 (en) 1983-11-17
DK214483A (en) 1983-11-15
NO831722L (en) 1983-11-15
FR2526860A1 (en) 1983-11-18
DE3317273C2 (en) 1991-04-11
GB2122256A (en) 1984-01-11
GB8312060D0 (en) 1983-06-08
NO162931C (en) 1990-03-07
FI75415C (en) 1988-06-09

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