Absorptive sound attenuator, in particular for air ducts in pape

Details Absorptive sound attenuator, in particular for air ducts in pape Absorptive sound attenuator, in particular for air ducts in pape

1991-11-22

1993-11-09

Gellner, Michael L.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181252, F01N 104

Patent

active

052605230

ABSTRACT:
An absorptive sound attenuator, which is intended particularly for intake and/or exhaust air ducts in paper mills. The sound attenuator comprises a box-like duct housing (10), in whose interior there is an inner tube (19), which is provided with through perforations (19a) and which forms the air duct (20). Around the inner tube is placed sound absorbing material (21, 22). The inner tube (19) defines the air duct (20) in its interior, the sound being absorbed in the area of the air duct (20). In order to facilitate cleaning and/or replacing of the sound attenuator components and the absorption material (21,22,26) in the duct housing (10) the absorptive sound attenuator is provided with openable outer walls (13a,13b,14a,14b,13A,13B). When these walls are open, the absorption material (21,22,26) can be removed and/or replaced from outside the inner tube (19).

REFERENCES:
patent: 3949830 (1976-04-01), Muehlbauer et al.
patent: 4034826 (1977-07-01), Andrews

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