Vehicle cooling system

Abstract

A cooling system includes a compressor that circulates refrigerant; a condenser that condenses the refrigerant; an expansion valve that reduces a pressure of the refrigerant that has been condensed by the condenser; an evaporator that vaporizes the refrigerant that has been reduced in pressure by the expansion valve; a refrigerant passage through which the refrigerant flows from an outlet of the condenser toward an inlet of the expansion valve, and that includes a passage forming portion that forms part of the refrigerant passage; a second passage that is connected in parallel with the passage forming portion; a cooling portion that is provided in the second passage and cools a heat source using the refrigerant; and an expansion valve that is arranged upstream of the cooling portion in the second passage.

1 . A cooling system that cools a heat source, comprising:
 a compressor that circulates refrigerant;   a condenser that condenses the refrigerant;   a first pressure reducer that reduces a pressure of the refrigerant that has been condensed by the condenser;   an evaporator that vaporizes the refrigerant that has been reduced in pressure by the first pressure reducer;   a first passage through which the refrigerant flows from an outlet of the condenser toward an inlet of the first pressure reducer, and that includes a passage forming portion that forms part of the first passage;   a second passage that is connected in parallel with the passage forming portion;   a cooling portion that is provided in the second passage and cools the heat source using the refrigerant from the condenser;   a second pressure reducer that is arranged upstream of the cooling portion in the second passage; and   another condenser arranged in the first passage, wherein the passage forming portion is provided between the condenser and the other condenser.   
     
     
         2 . The cooling system according to  claim 1 , further comprising a flow control valve that is arranged in the passage forming portion and regulates a flowrate of the refrigerant that flows through the passage forming portion and a flowrate of the refrigerant that flows through the second passage. 
     
     
         3 . (canceled) 
     
     
         4 . The cooling system according to  claim 1 , wherein the condenser has a greater heat releasing capability to release heat from the refrigerant than the other condenser does. 
     
     
         5 . The cooling system according to  claim 1 , further comprising a pressure increasing device that increases a pressure of the refrigerant that flows from the cooling portion toward the other condenser. 
     
     
         6 . The cooling system according to  claim 5 , further comprising another cooling portion that is provided in a path for the refrigerant that flows from the pressure increasing device toward the other condenser, and that cools another heat source that is different from the heat source, using the refrigerant.