Soundproofing panel

Abstract

The invention relates to a soundproofing panel comprising an “exciter” wall for putting into contact with a fluid in which there is a source of noise, and a “receiver” wall for putting into contact with a fluid in which it is desired to attenuate noise, the panel including between said two walls an intermediate element. In the panel, the intermediate element is held on at least a portion of its outline by means of at least one flexible element disposed between the intermediate wall and the receiver wall.

What is claimed is:  
     
         1 . A soundproofing panel comprising an “exciter” wall for putting into contact with a fluid containing a source of noise and a “receiver” wall for putting into contact with a fluid in which the noise is to be attenuated, the panel further comprising at least one intermediate element between said walls and the intermediate element comprises over at least a portion of its outline at least one element providing elastic coupling between the intermediate element and only the receiver wall.  
     
     
         2 . A panel according to  claim 1 , wherein the element(s) is/are situated only over the outline of the intermediate element or over at least a portion of said outline.  
     
     
         3 . A panel according to  claim 1 , wherein the intermediate element is constituted by a rigid or semi-rigid intermediate plate interposed between said layers of sound-absorbing material, the assembly constituted by the intermediate plate and the two layers of sound-absorbing material being sandwiched between said two walls.  
     
     
         4 . A panel according to  claim 1 , wherein at least one flexible element is a suspension stud made of flexible material, in particular of elastomer material.  
     
     
         5 . A panel according to  claim 4 , including a plurality of suspension studs distributed along the periphery of the intermediate sheet.  
     
     
         6 . A panel according to  claim 3 , wherein at least one flexible element is a strip of flexible material, in particular of elastomer material.  
     
     
         7 . A panel according to  claim 1 , including a rigid frame secured to receiver wall and wherein at least one flexible element is disposed between the frame and the intermediate element.  
     
     
         8 . A panel according to  claim 7 , wherein at least one said flexible element is interposed between the frame and the intermediate element.  
     
     
         9 . A panel according to  claim 7 , wherein at least one said flexible element is fixed between the inner outline of an opening in the frame and the periphery of the intermediate element.  
     
     
         10 . A panel according to  claim 3 , including a rigid frame secured to the intermediate sheet, and wherein at least one said flexible element is fixed between the frame and the receiver wall.  
     
     
         11 . A panel according to  claim 7 , wherein at least one flexible element is a flexible wall made up of one or more segments.  
     
     
         12 . A panel according to  claim 7 , wherein the rigid frame is a cellular array of the honeycomb type presenting an array of cells, in particular hexagonal cells, sandwiched between two rigid plates.  
     
     
         13 . A panel according to  claim 7 , wherein the rigid frame defines an internal cavity which is filled at least in part with soundproofing material.  
     
     
         14 . A panel according to  claim 7 , wherein the rigid frame presents one or more openings, and wherein the panel includes an intermediate element covering at least the outer outline of the rigid frame.  
     
     
         15 . A panel according to  claim 7 , wherein the rigid frame presents a plurality of openings, and wherein the panel comprises a plurality of intermediate elements, each covering one or more openings of the rigid frame.  
     
     
         16 . A panel according to  claim 14 , wherein at least one said opening is filled with sound-absorbing material.