Multi-cylinder frigorific compressor with external delivery manifold

Abstract

A multi-cylinder reciprocating compressor, especially suitable for carbon dioxide frigorific circuits, wherein the high-pressure chambers of the heads are connected via an external manifold, comprising a high-pressure cock which, in co-operation with the casing, defines a channel which environmental air flows through to remove heat.

1 . A multi-cylinder reciprocating compressor, comprising a casing ( 1 ), which develops along a horizontal longitudinal axis and is made accessible via at least one end cover, internally to which an electric motor is coaxially accommodated and drives a crankshaft into rotation which, by way of respective connecting rods, drives two or more pistons, slidingly coupled internally to their respective cylinders, the latter being defined in said casing ( 1 ) and closed above by a respective hollow head ( 2 ) which hermetically gives onto a corresponding opening defined above on the body of said casing ( 1 ); the following component parts being defined internally to said head ( 2 ):
 a suction chamber ( 21 );   a delivery chamber ( 22 );   
       and the following component parts being defined internally to said casing ( 1 ):
 a low-pressure fluid suction duct, which connects said suction chamber ( 21 ) to the external world via a low-pressure cock ( 5 ) placed on the outer lateral surface of said casing ( 1 ); 
 a lower lubricating oil collection area; 
 
       characterized in that on one of the outer walls of the delivery chambers ( 22 ) of at least two of said heads ( 2 ) there are defined respective exhaust openings through which said delivery chambers ( 22 ) of said heads ( 2 ) are hermetically connected to each other via a manifold ( 3 ); said manifold ( 3 ) being at least partially not in contact with said casing ( 1 ) and defining a channel with the latter, which environmental air flows through and consequently removes heat; said manifold ( 3 ) comprising at least one high-pressure cock ( 4 ) and one safety overpressure valve ( 31 ). 
     
     
         2 . The compressor according to the previous claim characterized in that it comprises a plurality of said manifolds ( 3 ) which connect two or more heads ( 2 ) respectively, each manifold ( 3 ) comprising a respective high-pressure cock ( 4 ). 
     
     
         3 . The compressor according to any of the previous claims characterized in that it comprises a transparent porthole in correspondence with said lower lubricating oil collection area. 
     
     
         4 . The compressor according to any of the previous claims characterized in that it is a semi-hermetic compressor. 
     
     
         5 . The compressor according to the previous  claim 4  characterized in that said casing ( 1 ) is hermetically closed by two end covers.