Sound absorber and sound absorbing device

Abstract

A sound absorber according to the present invention comprises: a tubular porous sheath with a non-circular cylindrical cross-section; a circular cylindrical soft fiber sound absorbent disposed inside the porous sheath in partial contact or non-contact with the porous sheath with the longitudinal direction thereof aligned with the longitudinal direction of the porous sheath; and a bar-like core with a non-circular cylindrical cross-section disposed inside the soft fiber sound absorbent in a partial contact or non-contact with the soft fiber sound absorbent with the longitudinal direction thereof aligned with the longitudinal direction of the soft fiber sound absorbent. A sound absorbing device according to the present invention comprises a plurality of the sound absorbers arranged side by side at specific intervals in two or more rows in a staggered configuration. Alternately, a plurality of sound absorbers having a generally isosceles trapezoidal cross-section are arranged in a row with the upper and lower bases of the isosceles trapezoidal cross-sectional shape thereof exposed to the outside alternately.

1 . A sound absorber, comprising: 
 a tubular porous sheath with a non-circular cylindrical cross-section;    a circular cylindrical soft fiber sound absorbent disposed inside the porous sheath in partial contact or non-contact with the porous sheath with the longitudinal direction thereof aligned with the longitudinal direction of the porous sheath; and    a tubular core with a non-circular cylindrical cross-section or a bar-like core with a non-circular cross-section disposed inside the soft fiber sound absorbent in a partial contact or non-contact with the soft fiber sound absorbent with the longitudinal direction thereof aligned with the longitudinal direction of the soft fiber sound absorbent.    
   
   
       2 . The sound absorber of  claim 1 , wherein the core functions as a sound wave reflector for blocking passage of sound waves and as a support for ensuring mechanical strength.  
   
   
       3 . The sound absorber of  claim 1 , further comprising outer caps for supporting longitudinal ends of the porous sheath, the soft fiber sound absorbent, and the core.  
   
   
       4 . The sound absorber of  claim 1 , wherein the porous sheath has a generally polygonal cross-section.  
   
   
       5 . The sound absorber of  claim 4 , wherein the porous sheath has a generally polygonal cross-section with sides having sawtooth-shaped projections and depressions.  
   
   
       6 . The sound absorber of  claim 4 , wherein the porous sheath has a generally rectangular cross-section.  
   
   
       7 . The sound absorber of  claim 4 , wherein the porous sheath has a generally triangular cross-section.  
   
   
       8 . The sound absorber of  claim 4 , wherein the porous sheath has a generally isosceles trapezoidal cross-section.  
   
   
       9 . The sound absorber of  claim 4 , wherein the porous sheath has a star-shaped cross-section with at least five projections.  
   
   
       10 . The sound absorber of  claim 1 , wherein the core has a generally polygonal cross-section.  
   
   
       11 . The sound absorber of  claim 10 , wherein the core has a star-shaped cross-section with at least three projections arranged circumferentially.  
   
   
       12 . The sound absorber of  claim 10 , wherein the core has a generally rectangular cross-section.  
   
   
       13 . The sound absorber of  claim 10 , wherein the core has a generally cross-shaped cross-section.  
   
   
       14 . The sound absorber of  claim 10 , wherein the core has a cross-section like that of a spline shaft with at least three rectangular tooth-like projections arranged circumferentially.  
   
   
       15 . The sound absorber of  claim 10 , wherein the core has a cross-section like that of a spline shaft with at least three trapezoidal tooth-like projections arranged circumferentially.  
   
   
       16 . The sound absorber of  claim 15 , wherein the trapezoidal tooth-like projections are wider at the top than at the base.  
   
   
       17 . A sound absorbing device, comprising a plurality of sound absorbers according to  claim 1  arranged side by side at specific intervals in two or more rows in a staggered configuration.  
   
   
       18 . A sound absorbing device, comprising a plurality of sound absorbers according to  claim 8  arranged in a row with the upper and lower bases of the isosceles trapezoidal cross-sectional shape thereof exposed to the outside alternately and parallel to each other.  
   
   
       19 . A sound absorbing device, comprising a plurality of sound absorbers according to  claim 4  arranged side by side at specific intervals in two or more rows in a staggered configuration.  
   
   
       20 . A sound absorbing device, comprising a plurality of sound absorbers according to  claim 10  arranged side by side at specific intervals in two or more rows in a staggered configuration.