SE8406282L - MUTOR FOR REDUCING CHANNEL-AIR AIR - Google Patents

MUTOR FOR REDUCING CHANNEL-AIR AIR

Info

Publication number
SE8406282L
SE8406282L SE8406282A SE8406282A SE8406282L SE 8406282 L SE8406282 L SE 8406282L SE 8406282 A SE8406282 A SE 8406282A SE 8406282 A SE8406282 A SE 8406282A SE 8406282 L SE8406282 L SE 8406282L
Authority
SE
Sweden
Prior art keywords
air
passageway
casing
absorbing material
sound
Prior art date
Application number
SE8406282A
Other languages
Swedish (sv)
Other versions
SE8406282D0 (en
SE447413B (en
Inventor
N-A Nilsson
Original Assignee
Viak 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 Viak Ab filed Critical Viak Ab
Priority to SE8406282A priority Critical patent/SE447413B/en
Publication of SE8406282D0 publication Critical patent/SE8406282D0/en
Priority to EP86900679A priority patent/EP0261105A1/en
Priority to PCT/SE1985/000540 priority patent/WO1987003948A1/en
Publication of SE8406282L publication Critical patent/SE8406282L/en
Publication of SE447413B publication Critical patent/SE447413B/en
Priority to NO88880116A priority patent/NO880116L/en
Priority to FI881922A priority patent/FI881922A/en

Links

Classifications

    • 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
    • F16L55/0336—Noise absorbers by means of sound-absorbing materials

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Exhaust Silencers (AREA)
  • Pipe Accessories (AREA)
  • Duct Arrangements (AREA)

Abstract

A device for reducing duct-carried air-borne sound comprises a casing (1) enclosing a duct and a certain volume of sound absorbing material (2) attached in said casing in such a manner, that at least partially a free longitudinal passageway (3) is formed, which is enclosed by a surface constituting the internal defining surface, or corresponding surface, for the sound absorbing material. Sound attenuation is required preferably in the frequency ranges 50-500 c.p.s. For this purpose, either a greater thickness of the absorbent material or a greater total length of the attenuator is required. A solution now proposed implies that the defining surface is assembled of at least three surfaces, which are convex toward the passageway and so abut each other, that the cross-section of the passageway (3) has star shape with at least three points.
SE8406282A 1984-12-11 1984-12-11 Noise muffler for reducing conduit borne air noise SE447413B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
SE8406282A SE447413B (en) 1984-12-11 1984-12-11 Noise muffler for reducing conduit borne air noise
EP86900679A EP0261105A1 (en) 1984-12-11 1985-12-20 Device for reducing duct-carried air-borne sound
PCT/SE1985/000540 WO1987003948A1 (en) 1984-12-11 1985-12-20 Device for reducing duct-carried air-borne sound
NO88880116A NO880116L (en) 1984-12-11 1988-01-12 DEVICE FOR REDUCTION OF CHANNELABLE AIR SOUND.
FI881922A FI881922A (en) 1984-12-11 1988-04-22 LJUDDAEMPARE FOER REDUCERING AV KANALBURET LUFTLJUD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8406282A SE447413B (en) 1984-12-11 1984-12-11 Noise muffler for reducing conduit borne air noise
PCT/SE1985/000540 WO1987003948A1 (en) 1984-12-11 1985-12-20 Device for reducing duct-carried air-borne sound

Publications (3)

Publication Number Publication Date
SE8406282D0 SE8406282D0 (en) 1984-12-11
SE8406282L true SE8406282L (en) 1986-06-12
SE447413B SE447413B (en) 1986-11-10

Family

ID=26658834

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8406282A SE447413B (en) 1984-12-11 1984-12-11 Noise muffler for reducing conduit borne air noise

Country Status (5)

Country Link
EP (1) EP0261105A1 (en)
FI (1) FI881922A (en)
NO (1) NO880116L (en)
SE (1) SE447413B (en)
WO (1) WO1987003948A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI91995C (en) * 1990-11-20 1994-09-12 Valmet Paper Machinery Inc Absorptive silencer, especially for air ducts in paper mills
EP0754901B1 (en) * 1995-07-21 2000-02-23 Robert Alan Gladden Noise attenuators, their manufacture, and their use for noise attenuation in ducts
FI124494B (en) 2010-05-12 2014-09-30 Jeven Oy Damping section for ventilation duct silencer and ventilation duct silencer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2620169A1 (en) * 1976-05-07 1977-11-10 Gruenzweig Hartmann Glasfaser Sound damper for ventilation pipes - has parallel rigid pipe sections made from mineral fibres with plastic-rubber dispersion forming abrasive resistant coat

Also Published As

Publication number Publication date
FI881922A0 (en) 1988-04-22
SE8406282D0 (en) 1984-12-11
FI881922A (en) 1988-04-22
WO1987003948A1 (en) 1987-07-02
NO880116D0 (en) 1988-01-12
NO880116L (en) 1988-01-12
EP0261105A1 (en) 1988-03-30
SE447413B (en) 1986-11-10

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