Cooling device

Abstract

A cooling device capable of improving constancy of the ability of a coolant to cool a heat source is provided. A cooling device-cooling an HV device includes a heat exchanger performing heat exchange between the coolant and air-conditioning air; a cooling unit connected in parallel with the heat exchanger and cooling the HV device using the coolant; an expansion valve provided on a downstream side of the heat exchanger and being regulated in opening degree in accordance with a temperature of the coolant between the heat exchanger and the expansion valve and regulating pressure of the coolant flowing through the heat exchanger; and an expansion valve provided on a downstream side of the cooling unit and being regulated in opening degree in accordance with a temperature of the coolant between the cooling unit and the expansion valve and regulating the pressure of the coolant flowing through the cooling unit.

1 . A cooling device cooling a heat source, said cooling device comprising:
 a compressor compressing a coolant;   a first heat exchanger performing heat exchange between said coolant and outside air;   a decompressor decompressing said coolant;   a second heat exchanger performing heat exchange between said coolant and air-conditioning air;   a cooling unit connected in parallel with said second heat exchanger and cooling said heat source using said coolant;   a first pressure regulating valve disposed on a downstream side of said second heat exchanger and regulating pressure of said coolant flowing through said second heat exchanger; and   a second pressure regulating valve disposed on a downstream side of said cooling unit and regulating the pressure of said coolant flowing through said cooling unit,   said first pressure regulating valve being regulated in opening degree in accordance with a temperature of said coolant between said decompressor and said first pressure regulating valve, and   said second pressure regulating valve being regulated in opening degree in accordance with the temperature of said coolant between said decompressor and said second pressure regulating valve.   
     
     
         2 . The cooling device according to  claim 1 , wherein
 said first pressure regulating valve is increased in valve opening degree when the temperature of said coolant between said decompressor and said first pressure regulating valve is higher than a set value, and decreased in valve opening degree when the temperature of said coolant between said decompressor and said first pressure regulating valve is lower than the set value, and   said second pressure regulating valve is increased in valve opening degree when the temperature of said coolant between said decompressor and said second pressure regulating valve is higher than a set value, and decreased in valve opening degree when the temperature of said coolant between said decompressor and said second pressure regulating valve is lower than the set value.   
     
     
         3 . The cooling device according to  claim 1 , comprising a gas-liquid separator separating the coolant to be sucked into said compressor into gas and liquid. 
     
     
         4 . The cooling device according to  claim 1 , wherein said decompressor includes a first flow rate control valve regulating a flow rate of said coolant flowing into said second heat exchanger, and a second flow rate control valve regulating the flow rate of said coolant flowing into said cooling unit. 
     
     
         5 . The cooling device according to  claim 4 , wherein
 said first flow rate control valve is regulated in opening degree in accordance with a degree of superheat of said coolant on an outlet side of said second heat exchanger, and   said second flow rate control valve is regulated in opening degree in accordance with the degree of superheat of said coolant on an outlet side of said cooling unit.   
     
     
         6 . The cooling device according to  claim 5 , wherein
 said first flow rate control valve is increased in valve opening degree when the degree of superheat of said coolant on the outlet side of said second heat exchanger is higher than a set value, and decreased in valve opening degree when the degree of superheat of said coolant on the outlet side of said second heat exchanger is lower than the set value, and   said second flow rate control valve is increased in valve opening degree when the degree of superheat of said coolant on the outlet side of said cooling unit is higher than a set value, and decreased in valve opening degree when the degree of superheat of said coolant on the outlet side of said cooling unit is lower than the set value.