Air-conditioning silencing device

Abstract

An air-conditioning silencing device provided in a pipe of an air-conditioning refrigerant including a CO2 includes a muffler body having a cylindrical body having no joint in a circumferential direction, and a pair of lid bodies airtightly welded to both axial ends of the cylindrical body so as to close an opening at both axial ends of the cylindrical body.

What is claimed is: 
     
         1 . An air-conditioning silencing device provided in a pipe for an air-conditioning refrigerant containing carbon dioxide (CO2), the air-conditioning silencing device comprising a muffler body including:
 a cylindrical body having no seam in a circumferential direction; and   a pair of lid bodies airtightly welded to both axial ends of the cylindrical body so as to close openings at both the axial ends of the cylindrical body.   
     
     
         2 . The air-conditioning silencing device according to  claim 1 , wherein the cylindrical body has a wall thickness of more than 4 mm. 
     
     
         3 . The air-conditioning silencing device according to  claim 1 , wherein the muffler body further includes a punching separator disposed in an internal space of the cylindrical body to axially divide the internal space and formed with a plurality of through holes. 
     
     
         4 . The air-conditioning silencing device according to  claim 1 , further comprising:
 an inlet pipe that leads the refrigerant to the muffler body; and   an outlet pipe that leads the refrigerant downstream from the muffler body, wherein   the inlet pipe and the outlet pipe are joined to the muffler body by brazing.   
     
     
         5 . The air-conditioning silencing device according to  claim 1 , wherein the cylindrical body has a cylindrical shape with a constant outside diameter.