Vapor compression refrigerating systems

Abstract

A vapor compression refrigerating system includes a compressor, a radiator connected to the compressor via a first tube, a first pressure reducing mechanism connected to the radiator via a second tube, and a separator connected to the first pressure reducing mechanism via a third tube and the compressor via a fourth tube. The separator includes an oil separator which is configured to separate an oil from the refrigerant, and a liquid and gas separator formed integral with the oil separator. The liquid and gas separator is configured to separate a liquid portion and a gas portion from the refrigerant, and the separator is further configured to transmit the oil and the gas portion to the compressor via the fourth tube. The system also includes a second pressure reducing mechanism connected to the separator via a fifth tube, and an evaporator connected to the second pressure reducing mechanism via a sixth tube and operationally coupled to the compressor via a seventh tube. The second pressure reducing mechanism is configured to receive the liquid portion from the separator.

1 . A vapor compression refrigerating system comprising: 
 a compressor configured to compress a refrigerant;    a radiator connected to the compressor via a first tube, wherein the radiator is configured to receive the refrigerant from the compressor and to radiate the refrigerant;    a first pressure reducing mechanism connected to the radiator via a second tube, wherein the first pressure reducing mechanism is configured to receive the refrigerant from the radiator and to reduce a pressure of the refrigerant;    a separator connected to the first pressure reducing mechanism via a third tube and the compressor via a fourth tube, wherein the separator is configured to receive the refrigerant from the first pressure reducing mechanism, and the separator comprises: 
 an oil separator which is configured to separate an oil from the refrigerant; and  
 a liquid and gas separator formed integral with the oil separator, wherein the liquid and gas separator is configured to separate a liquid portion and a gas portion from the refrigerant, and the separator is further configured to transmit the oil and the gas portion to the compressor via the fourth tube;  
   a second pressure reducing mechanism connected to the separator via a fifth tube, wherein the second pressure reducing mechanism is configured to receive the liquid portion from the separator and to reduce a pressure of the liquid portion; and    an evaporator connected to the second pressure reducing mechanism via a sixth tube and operationally coupled to the compressor via at least a seventh tube, wherein the evaporator is configured to receive the liquid portion from the second pressure reducing mechanism and to evaporate the liquid portion.    
   
   
       2 . The vapor compression refrigerating system of  claim 1 , wherein the evaporator is connected to the compressor via the separator, and the evaporator is configured to receive the liquid portion from the second pressure reducing mechanism and to evaporate the liquid portion into an evaporated portion and to transmit the evaporated portion to the separator, wherein the system further comprises means for exchanging heat between the liquid portion and evaporated portion.  
   
   
       3 . The vapor compression refrigerating system of  claim 1 , wherein the oil separator comprises at least one of a centrifugal oil separator and a collision oil separator.  
   
   
       4 . The vapor compression refrigerating system of  claim 1 , wherein the first pressure reducing mechanism is configured to control a pressure of the refrigerant at an exit side of the first pressure reducing mechanism to be less than or equal to a critical pressure.  
   
   
       5 . The vapor compression refrigerating system of  claim 1 , wherein at least one of the first pressure reducing mechanism and the second pressure reducing mechanism comprises a mechanical expansion valve which changes a degree of expansion in response to at least one of a temperature and a pressure of the refrigerant.  
   
   
       6 . The vapor compression refrigerating system of  claim 1 , wherein at least one of the first pressure reducing mechanism and the second pressure reducing mechanism comprises an electronic expansion valve which changes an opening degree of a valve by an electric signal in response to at least one of a temperature and a pressure of the refrigerant.  
   
   
       7 . The vapor compression refrigerating system of  claim 1 , wherein the refrigerant comprises carbon dioxide.  
   
   
       8 . An air conditioning system comprising a vapor compression refrigerating system, wherein the vapor compression refrigerating system comprises: 
 a compressor configured to compress a refrigerant;    a radiator connected to the compressor via a first tube, wherein the radiator is configured to receive the refrigerant from the compressor and to radiate the refrigerant;    a first pressure reducing mechanism connected to the radiator via a second tube, wherein the first pressure reducing mechanism is configured to receive the refrigerant from the radiator and to reduce a pressure of the refrigerant;    a separator connected to the first pressure reducing mechanism via a third tube and the compressor via a fourth tube, wherein the separator is configured to receive the refrigerant from the first pressure reducing mechanism, and the separator comprises: 
 an oil separator which is configured to separate an oil from the refrigerant; and  
 a liquid and gas separator formed integral with the oil separator, wherein the liquid and gas separator is configured to separate a liquid portion and a gas portion from the refrigerant, and the separator is further configured to transmit the oil and the gas portion to the compressor via the fourth tube;  
   a second pressure reducing mechanism connected to the separator via a fifth tube, wherein the second pressure reducing mechanism is configured to receive the liquid portion from the separator and to reduce a pressure of the liquid portion; and    an evaporator connected to the second pressure reducing mechanism via a sixth tube and operationally coupled to the compressor via at least a seventh tube, wherein the evaporator is configured to receive the liquid portion from the second pressure reducing mechanism and to evaporate the liquid portion.    
   
   
       9 . A vehicle comprising an air conditioning system, wherein the air conditioning system comprises a vapor compression refrigerating system, and the vapor compression refrigerating system comprises: 
 a compressor configured to compress a refrigerant;    a radiator connected to the compressor via a first tube, wherein the radiator is configured to receive the refrigerant from the compressor and to radiate the refrigerant;    a first pressure reducing mechanism connected to the radiator via a second tube, wherein the first pressure reducing mechanism is configured to receive the refrigerant from the radiator and to reduce a pressure of the refrigerant;    a separator connected to the first pressure reducing mechanism via a third tube and the compressor via a fourth tube, wherein the separator is configured to receive the refrigerant from the first pressure reducing mechanism, and the separator comprises: 
 an oil separator which is configured to separate an oil from the refrigerant; and  
 a liquid and gas separator formed integral with the oil separator, wherein the liquid and gas separator is configured to separate a liquid portion and a gas portion from the refrigerant, and the separator is lurer configured to transmit the oil and the gas portion to the compressor via the fourth tube;  
   a second pressure reducing mechanism connected to the separator via a fifth tube, wherein the second pressure reducing mechanism is configured to receive the liquid portion from the separator and to reduce a pressure of the liquid portion; and    an evaporator connected to the second pressure reducing mechanism via a sixth tube and operationally coupled to the compressor via at least a seventh tube, wherein the evaporator is configured to receive the liquid portion from the second pressure reducing mechanism and to evaporate the liquid portion.