Acoustic muffler for a refrigeration compressor

Abstract

The acoustic muffler comprises a hollow body ( 10 ) defining at least one muffler chamber ( 11 ) which carries a gas inlet duct ( 20 ) and a gas outlet duct ( 30 ), at least one of the parts defined by the hollow body ( 10 ), by the gas inlet duct ( 20 ) and by the gas outlet duct ( 30 ) defining a gas passage (P) provided with at least one impurity filter ( 40 ) presenting a mesh surface ( 41 ) larger than that defined by the contour of the cross-section of said gas passage (P) and projecting to at least one of the sides of said cross-section.

1 . An acoustic muffler for a refrigeration compressor, comprising:
 a hollow body defining at least one muffler chamber which carries a gas inlet duct having an inlet opening external to the muffler chamber;   an outlet opening in the interior of the muffler chamber;   a gas outlet duct presenting an inlet opening in the interior of the muffler chamber; and   an outlet opening external to said muffler chamber, at least one of the parts defined by the hollow body, by the gas inlet duct and by the gas outlet duct defining a gas passage provided with an impurity filter in the form of a mesh, wherein at least one impurity filter presents a mesh surface larger than that defined by the contour of the cross-section of said gas passage and projecting to at least one of the sides of said cross-section.   
   
   
       2 . An acoustic muffler, as set forth in  claim 1 , wherein the mesh surface of the impurity filter projects to one of the sides of the cross-section of the gas passage, towards the refrigerant gas flow. 
   
   
       3 . An acoustic muffler, as set forth in  claim 2 , wherein the mesh surface of the impurity filter presents a tubular shape having an end with a contour coinciding with that of the cross-section of the gas passage, and a closed opposite end. 
   
   
       4 . An acoustic muffler, as set forth in  claim 3 , wherein the opposite end of the impurity filter is defined by a mesh portion in the form of a substantially spherical cap. 
   
   
       5 . An acoustic muffler, as set forth in  claim 1 , wherein the gas inlet duct comprises at least one impurity filter provided adjacent to the inlet opening of said gas inlet duct. 
   
   
       6 . An acoustic muffler, as set forth in  claim 1 , wherein the gas outlet duct comprises at least one impurity filter provided adjacent to the inlet opening of said gas outlet duct. 
   
   
       7 . An acoustic muffler, as set forth in  claim 1 , wherein the mesh surface is made of metallic material. 
   
   
       8 . An acoustic muffler, as set forth in  claim 1 , wherein it comprises a fixation means securing at least one impurity filter in the respective gas passage. 
   
   
       9 . An acoustic muffler, as set forth in  claim 8 , wherein the fixation means comprises at least one retaining projection provided in one of the parts of gas inlet duct and gas outlet duct, to be seated on an adjacent portion of the end of the impurity filter. 
   
   
       10 . An acoustic muffler, as set forth in  claim 9 , wherein the retaining projection is plastically deformable at the end of the impurity filter. 
   
   
       11 . An acoustic muffler, as set forth in  claim 10 , wherein the retaining projection is thermically deformable.