Refrigeration compressor with internal cooling system

Abstract

A refrigeration compressor includes an internal cooling system. The compressor includes a compressor shell ( 1 ), inside of which are disposed a compression cylinder ( 2, 3 ), a piston that performs an alternating movement inside the cylinder, an oil accumulation region ( 5 ) in the lower part of the compressor shell, and piston drive means having a rotary shaft ( 4 ) oriented substantially vertically, with an upper end mounted to a piston drive cam ( 7 ). The compressor has a system for collecting the oil coming from the shaft ( 4 ), and expelled by the cam ( 7 ), in the upper part of the shell ( 1 ). This accumulated oil is drained over the compression cylinder ( 2, 3 ), so as to cool it, thus increasing the efficiency of the compressor.

1 . A refrigeration compressor comprising an inner cooling system, said compressor comprising a compressor shell, inside of which are included:
 a compression cylinder comprising a cylinder body ( 3 ) and a cylinder head ( 2 ),   a piston ( 12 ) that performs an alternating movement inside the cylinder,   an oil accumulation region ( 5 ) in the lower part of the compressor shell,   piston drive means that drive the alternating movement of the piston inside the cylinder,   oil pumping means for pumping oil from the oil accumulation region ( 5 ) over the piston drive means, wherein the compressor shell ( 1 ) comprises an oil sump ( 8 ) located in its an internal upper portion, the oil sump comprising an oil drain ( 9 ) directed on the surface of the cylinder.   
     
     
         2 . The refrigeration compressor according to  claim 1 , wherein the oil sump ( 8 ) extends around the entire inner circumference of the compressor shell ( 1 ). 
     
     
         3 . The refrigeration compressor according to  claim 1 , wherein the oil drain ( 9 ) of the oil sump is directed to spill oil onto the cylinder body ( 2 ). 
     
     
         4 . The refrigeration compressor according to  claim 1 , wherein the compressor shell ( 1 ) comprises a cover ( 6 ), and the oil sump ( 8 ) is formed in the region of the cover. 
     
     
         5 . The refrigeration compressor according to  claim 4 , wherein the oil sump is formed integrally with the cover ( 6 ). 
     
     
         6 . The refrigeration compressor according to  claim 1 , wherein the oil sump ( 8 ) is formed integrally with the compressor shell ( 1 ). 
     
     
         7 . The refrigeration compressor according to  claim 1 , wherein the oil sump is formed by stamping during the production process of a part of the compressor shell ( 1 ). 
     
     
         8 . The refrigeration compressor according to  claim 1 , wherein the oil sump is built as an additional part which is coupled to a part of the compressor shell. 
     
     
         9 . The refrigeration compressor according to  claim 1 , wherein the piston drive means comprises a rotary shaft ( 4 ) oriented substantially vertically, which has an upper end mounted to a piston drive cam ( 7 ), through which the oil pumped over the piston drive means is expelled. 
     
     
         10 . The refrigeration compressor according to  claim 1 , wherein the oil sump comprises an oil collection region ( 11 ), in which at least a portion of the oil is collected which is expelled by the piston drive means. 
     
     
         11 . The refrigeration compressor according to  claim 10 , wherein the oil collection region ( 11 ) has a geometry that allows the run-off of the oil collected for draining ( 9 ) the oil sump ( 8 ). 
     
     
         12 . The refrigeration compressor according to  claim 1 , further comprising an oil cooling device disposed in the oil sump ( 8 ). 
     
     
         13 . The refrigeration compressor according to  claim 2 , wherein the oil drain ( 9 ) of the oil sump is directed to spill oil onto the cylinder body ( 2 ). 
     
     
         14 . The refrigeration compressor according to  claim 2 , wherein the compressor shell ( 1 ) comprises a cover ( 6 ), and the oil sump ( 8 ) is formed in the region of the cover. 
     
     
         15 . The refrigeration compressor according to  claim 14 , wherein the oil sump is formed integrally with the cover ( 6 ). 
     
     
         16 . The refrigeration compressor according to  claim 3 , wherein the compressor shell ( 1 ) comprises a cover ( 6 ), and the oil sump ( 8 ) is formed in the region of the cover. 
     
     
         17 . The refrigeration compressor according to  claim 16 , wherein the oil sump is formed integrally with the cover ( 6 ). 
     
     
         18 . The refrigeration compressor according to  claim 2 , wherein the oil sump ( 8 ) is formed integrally with the compressor shell ( 1 ). 
     
     
         19 . The refrigeration compressor according to  claim 2 , wherein the piston drive means comprises a rotary shaft ( 4 ) oriented substantially vertically, which has an upper end mounted to a piston drive cam ( 7 ), through which the oil pumped over the piston drive means is expelled. 
     
     
         20 . The refrigeration compressor according to  claim 3 , wherein the piston drive means comprises a rotary shaft ( 4 ) oriented substantially vertically, which has an upper end mounted to a piston drive cam ( 7 ), through which the oil pumped over the piston drive means is expelled.