Reciprocating compressor for a cooling device

Abstract

A reciprocating compressor for a cooling device provided with a closed circuit (C) having a main branch (M), in which a first flow rate (X) of circulating coolant enters in the compressor, and a first economizer branch, or secondary branch (E), in which a second flow rate (X1) of coolant circulates under a pressure different from the pressure of the first flow rate (X) of coolant, the compressor being provided with a cylinder and a piston reciprocatingly moving in the cylinder, between a top dead center (S) and a bottom dead center (I), and having a suction duct for the entrance of the first flow rate of coolant, and a port obtained in the wall of the cylinder for the entrance of the second flow rate of coolant, in such a way that the piston exposes at least in part the first inlet port, at least during its inlet stroke, and covers the port at least during its compression stroke, wherein the first inlet port has a slit shape with the main dimension substantially transverse to the axis (A) of the cylinder.

1 . A reciprocating compressor for a cooling device provided with a closed circuit (C) having a main branch (M), in which a first flow rate (X) of coolant circulates and enters said compressor, a first economizer branch, or secondary branch (E), in which a second flow rate (X 1 ) of fluid circulates under a pressure different from the pressure of said first flow rate (X) of coolant, and an additional economizer branch, or secondary branch (F), in which an additional flow rate (X 2 ) of said coolant circulates, said compressor being provided with a cylinder and a piston reciprocatingly moving in said at least one cylinder, between a top dead center (S) and a bottom dead center (I), and comprising a suction duct for the entrance of said first flow rate of coolant, and a port obtained in the wall of said cylinder for the entrance of said second flow rate of coolant, so that said piston exposes at least in part said first inlet port, at least during its inlet stroke, and covers said port, at least during its compression stroke, wherein said first inlet port has a slit shape with the main dimension (L) substantially transverse to the axis (A) of said cylinder and is arranged at the bottom dead center of said piston, said compressor further comprising a second port obtained in the wall of said cylinder for the entrance of said additional flow rate (X 2 ) of coolant in said compressor, wherein said second port has a slit shape with the main dimension (L) substantially transverse to the axis (A) of said cylinder and is arranged at a distance (D) from said bottom dead center centre greater than the distance (d) at which said first port is positioned, so that said piston exposes said second inlet port, at least during its inlet stroke, and covers said second port, at least during its compression stroke. 
     
     
         2 . The compressor according to  claim 1 , wherein said first port has a lower side substantially flush with the bottom dead center of said piston. 
     
     
         3 . The compressor according to  claim 1 , wherein said first port and/or said at least ono second port has/have a substantially rectangular shape, lying on the inner cylindrical surface of said cylinder. 
     
     
         4 . The compressor according to  claim 3 , wherein the ratio between the height (H) and length (L) dimensions of said first port and/or said second port is smaller than 0.5. 
     
     
         5 . The compressor according to  claim 1 , wherein the lower side of said second port is flush with the upper side of said first port. 
     
     
         6 . The compressor according to  claim 1 , wherein said first inlet port and/or said second inlet port comprises/comprise a functionally-combined non-return valve. 
     
     
         7 . The compressor according to  claim 6 , wherein said non-return valve is of deformable reed type. 
     
     
         8 . The compressor according to  claim 7 , wherein said non-return valve is housed in the wall of said cylinder. 
     
     
         9 . The compressor according to  claim 4 , wherein the ratio between the height (H) and length (L) dimensions of said first port and/or said second port is smaller than 0.2.