System for attenuating pulsation in the gas discharge of a refrigeration compressor

Abstract

The attenuation system is applied to a compressor which comprises: a cylinder ( 2 ) having an end closed by a valve plate ( 4 ) provided with a discharge orifice ( 4 a ) and defining, with the cylinder ( 2 ), a compression chamber ( 6 ), a cylinder cover ( 5 ) being seated against the valve plate ( 4 ) and defining a discharge chamber ( 7 ), which communicates with the exterior of the compressor through a discharge tube ( 8 ). The attenuation system comprises: at least one intermediary chamber ( 10 ) defined in the interior of the discharge chamber ( 7 ), in order to receive, from the discharge orifice ( 4 a ), the whole discharge flow coming from the compression chamber ( 6 ); and at least one 4 a connecting tube ( 20 ) mounted in the interior 4 b of the discharge chamber ( 7 ), having a first end ( 21 ) open to the interior of the intermediary chamber ( 10 ) and a second end ( 22 ) open to the interior of the discharge chamber ( 7 ).

1 . A system for attenuating pulsation in the gas discharge of a refrigeration compressor of the type which comprises: a cylinder block ( 1 ) defining a cylinder ( 2 ); a valve plate ( 4 ) closing an end of the cylinder ( 2 ) and provided with a discharge orifice ( 4   a ) and defining, with the cylinder ( 2 ), a compression chamber ( 6 ); a cylinder cover ( 5 ) seated against a face of the valve plate ( 4 ) opposite to that turned to the compression chamber ( 6 ) and defining a discharge chamber ( 7 ); a discharge tube ( 8 ) to communicate the discharge chamber ( 7 ) with the exterior of the compressor, characterized in that it comprises:
 at least one intermediary chamber ( 10 ) defined in the interior of the discharge chamber ( 7 ), so as to receive, from the discharge orifice ( 4   a ), the whole discharge flow coming from the compression chamber ( 6 );   at least one connecting tube ( 20 ) mounted in the interior of the discharge chamber ( 7 ), having a first end ( 21 ) open to the interior of the intermediary chamber ( 10 ) and a second end ( 22 ) open to the interior of the discharge chamber ( 7 ), said connecting tube ( 20 ) projecting, by a certain extension, to the interior of at least one of the intermediary chamber ( 10 ) and discharge chamber ( 7 ).   
     
     
         2 . The system, as set forth in  claim 1 , characterized in that the first and second ends ( 21 ,  22 ) of the connecting tube ( 20 ) are eccentrically disposed in the intermediary chamber ( 10 ) and discharge chamber ( 7 ). 
     
     
         3 . The system, as set forth in  claim 2 , characterized in that the connecting tube ( 20 ) presents, between its first end and its second end ( 21 ,  22 ), an extension calculated as a function of the main pulsation mode of the gas under compression to be attenuated. 
     
     
         4 . The system, as set forth in  claim 3 , characterized in that the first end ( 21 ) of the connecting tube ( 20 ) projects to the interior of the intermediary chamber ( 10 ), by a determined extension previously calculated as a function of the pulsation mode to be attenuated. 
     
     
         5 . The system, as set forth in  claim 1 , characterized in that the connecting tube ( 20 ) presents a spiral development, from its first end ( 21 ) and which extends at least along the extension of the connecting tube ( 20 ) which is internal to the discharge chamber ( 7 ). 
     
     
         6 . The system, as set forth in  claim 1 , characterized in that the connecting tube ( 20 ) is formed in a single piece with the intermediary chamber ( 10 ). 
     
     
         7 . The system, as set forth in  claim 1 , characterized in that at least one of the parts of intermediary chamber ( 10 ) and connecting tube ( 20 ) is provided in an acoustic insulating material. 
     
     
         8 . The system, as set forth in  claim 1 , characterized in that the second end ( 22 ) of the connecting tube ( 20 ) is disposed spaced from the open end of the discharge tube ( 8 ). 
     
     
         9 . The system, as set forth in  claim 1 , characterized in that the intermediary chamber ( 10 ) is hermetically attached to the valve plate ( 4 ). 
     
     
         10 . The system, as set forth in  claim 9 , characterized in that the intermediary chamber ( 10 ) is a hollow body having an opening whose contour is defined by a peripheral edge ( 10   a ) to be seated and affixed against the valve plate ( 4 ). 
     
     
         11 . The system, as set forth in  claim 10 , characterized in that the hollow body is rigid.