Silencer with a plurality of resonance chambers

Abstract

The invention relates to a sound absorber mounted on or in a component, wherein a sound which is to be absorbed is propagated. The silencer comprises a hollow body, which communicates with the component or forms a component part of the component. A plurality of Helmholtz resonators which operate in a parallel manner are arranged behind each other in the axial direction of the hollow body in at least one axial part of the hollow body.

1 . A sound absorber on or in a component ( 7 ), in which a sound to be damped disperses, with a hollow body ( 8 ), which communicates with the component ( 7 ) or forms an element of the component ( 7 ), whereby at least in one axial section ( 9 ) of the hollow body ( 8 ), multiple, parallel acting Helmholtz resonators ( 10 ) are arranged one after another in an axial direction of the hollow body ( 8 ).  
     
     
         2 . The sound absorber according to  claim 1 ,  
       characterized in that 
 in the at least one axial section ( 9 ) of the hollow body ( 8 ), multiple, parallel acting Helmholtz resonators ( 10 ) are arranged side by side in a circumferential direction of the hollow body ( 8 ).  
 
     
     
         3 . The sound absorber according to  claim 2 ,  
       characterized in that 
 in the at least one axial section ( 9 ) of the hollow body ( 8 ) in a zone ( 14 ) extending in an axial direction and in a circumferential direction of the hollow body ( 8 ), multiple, parallel acting Helmholtz resonators ( 10 ) are arranged in the axial direction of the hollow body ( 8 ) one after another and side by side in the circumferential direction of the hollow body ( 8 ).  
 
     
     
         4 . The sound absorber according to  claim 3 ,  
       characterized in that 
 the zone ( 14 ) encloses the hollow body ( 8 ) completely in the circumferential direction.  
 
     
     
         5 . The sound absorber according to  claim 3 ,  
       characterized in that 
 two or more zones ( 14 ) are distributed on the hollow body ( 8 ).  
 
     
     
         6 . The sound absorber according to one of claims  1  through  5 ,  
       characterized in that 
 adjacent Helmholtz resonators ( 10 ) border one another.  
 
     
     
         7 . The sound absorber according to  claim 6 ,  
       characterized in that 
 Helmholtz resonators ( 10 ) bordering one another have common walls or wall sections ( 10 ).  
 
     
     
         8 . The sound absorber according to one of claims  1  through  7 ,  
       characterized in that 
 the cross sections of the Helmholtz resonators ( 10 ) are smaller than the cross section of the hollow body ( 8 ).  
 
     
     
         9 . The sound absorber according to one of claims  1  through  8 ,  
       characterized in that 
 each Helmholtz resonator ( 10 ) has a hollow chamber ( 11 ), which communicates with an interior ( 13 ) of the hollow body ( 8 ) via a separate connection opening ( 12 ).  
 
     
     
         10 . The sound absorber according to  claim 9 ,  
       characterized in that 
 a distance ( 17 ) between Helmholtz resonators ( 10 ) adjacent to the connection openings ( 12 ) is smaller than a wavelength or half a wavelength of a frequency to be damped or smaller than a middle wave length or half a middle wavelength of a frequency band to be damped.  
 
     
     
         11 . The sound absorber according to one of claims  1  through  10 ,  
       characterized in that 
 each Helmholtz resonator ( 10 ) has a hollow chamber ( 11 ), whereby the hollow chambers ( 11 ) of multiple Helmholtz resonators ( 10 ) are closed radially outward with a common cover.  
 
     
     
         12 . The sound absorber accordion one of claims  1  through  11 ,  
       characterized in that 
 at least some of the Helmholtz resonators ( 10 ) differ from one another in by having different lengths and/or cross sections and/or geometries and/or orientations of their hollow chambers ( 11 ) and/or their connection openings.  
 
     
     
         13 . The sound absorber according to one of claims  1  through  12 ,  
       characterized in that 
 at least some of the Helmholtz resonators ( 10 ) are arranged parallel to one another.  
 
     
     
         14 . The sound absorber according to one of claims  1  through  13 ,  
       characterized in that 
 at least some of the Helmholtz resonators ( 10 ) are arranged radially to a longitudinal axis ( 15 ) of the hollow body ( 8 ).  
 
     
     
         15 . The sound absorber according to one of claims  1  through  14 ,  
       characterized in that 
 at least some of the Helmholtz resonators are formed on the hollow body ( 8 ), such that a common block containing the hollow chambers ( 11 ) of these Helmholtz resonators ( 10 ) is bordered radially outward by a common cover and radially inward by a common wall section of the hollow body ( 8 ) containing the connection openings ( 12 ) of these Helmholtz resonators ( 10 ).  
 
     
     
         16 . The sound absorber according to  claim 15 ,  
       characterized in that 
 the block has a honeycomb structure.  
 
     
     
         17 . The sound absorber according to one of claims  1  through  16 ,  
       characterized in that 
 the hollow body ( 8 ) forms a housing or a housing element of the component ( 7 ).  
 
     
     
         18 . The sound absorber according to one of claims  1  through  17 ,  
       characterized in that 
 the sound absorber ( 1 ) is formed as an attaching part for attachment to the component ( 7 ) or as a mounting part for installation in the component ( 7 ) or as an integrated element of the component ( 7 ).  
 
     
     
         19 . The sound absorber according to one of claims  1  through  18 ,  
       characterized in that 
 the component ( 7 ) forms an element of a fresh air tract ( 4 ) or an exhaust tract of an internal combustion engine ( 2 ).  
 
     
     
         20 . The sound absorber according to  claim 19 ,  
       characterized in that 
 the sound absorber ( 1 ) is arranged in the fresh air tract ( 4 ) downstream of an air filter ( 5 ) and upstream of an exhaust turbocharger ( 3 ) of the internal combustion engine.  
 
     
     
         21 . The sound absorber according to  claim 19  or  20 ,  
       characterized in that 
 the component is formed by a line ( 7 ) or an air filter or an air accumulator.  
 
     
     
         22 . A use of a sound absorber ( 1 ) according to one of claims  1  through  21  on or in an apparatus, which is operated by a combustion engine or with an electric engine or with compressed air.  
     
     
         23 . The use according to  claim 22 ,  
       characterized in that 
 the apparatus is formed as a motor vehicle or a washing machine or a dish washer or a clothes dryer or a hair dryer or a vacuum cleaner or an exhaust air blower or an air intake assembly or a compressed-air-or electrical motor-operated tool.  
 
     
     
         24 . The use of a sound absorber ( 1 ) according to one of claims  1  through  21  for damping sound in the range of relatively high frequencies, for example, from approximately 900 Hz.