Thermal management system for vehicle

Abstract

A thermal management system for a vehicle includes a base circuit in which a compressor, a condenser, an expansion valve, and an evaporator are provided in order and in which a refrigerant is circulated, a recirculation circuit branched from a discharge portion of the compressor in the base circuit and joined to an inlet portion of the compressor so that the refrigerant discharged from the compressor is recirculated to an inlet of the compressor, and an adjusting valve positioned at the discharge portion where the recirculation circuit is branched from the base circuit or positioned at the inlet portion where the recirculation circuit is joined to the base circuit, the adjusting valve configured to adjust a flow rate of the refrigerant that flows to the recirculation circuit.

What is claimed is: 
     
         1 . A thermal management system for a vehicle, the thermal management system comprising:
 a base circuit in which a compressor, a condenser, an expansion valve, and an evaporator are provided in order, wherein a refrigerant is circulated in the base circuit;   a recirculation circuit branched from a discharge portion of the compressor in the base circuit and joined to the compressor or an inlet portion of the compressor so that the refrigerant discharged from the compressor is recirculated to an inlet of the compressor; and   an adjusting valve positioned at the discharge portion where the recirculation circuit is branched from the base circuit or positioned at the inlet portion where the recirculation circuit is joined to the base circuit, the adjusting valve configured to adjust a flow rate of the refrigerant that flows to the recirculation circuit.   
     
     
         2 . The thermal management system of  claim 1 , further including an ejector positioned at the inlet portion where the recirculation circuit is joined to the base circuit, the ejector configured to perform suction of the refrigerant in the base circuit by use of flowing of the refrigerant in the recirculation circuit. 
     
     
         3 . The thermal management system of  claim 1 , wherein the compressor is a two-stage compressor in which the refrigerant in a gaseous state is additionally injected into an intermediate portion of compressor and the refrigerant in the gaseous state is mixed, and
 the recirculation circuit is connected to the compressor so that the refrigerant is additionally injected into the intermediate portion of the compressor.   
     
     
         4 . The thermal management system of  claim 1 , wherein the base circuit has a flash tank which is provided between the condenser and the evaporator, and the thermal management system further includes a flash circuit branched from the flash tank of the base circuit and joined to the recirculation circuit so that the refrigerant in a gaseous state separated in the flash tank flows to the recirculation circuit. 
     
     
         5 . The thermal management system of  claim 4 , wherein the expansion valve includes a first expansion valve positioned at an upstream point of the flash tank and a second expansion valve positioned at a downstream point of the flash tank. 
     
     
         6 . The thermal management system of  claim 4 , further including a shutoff valve provided in the flash circuit between the flash tank and the recirculation circuit, the shutoff valve configured to adjust the flow rate of the refrigerant that flows to the flash circuit. 
     
     
         7 . The thermal management system of  claim 1 , wherein the base circuit has a heat-exchanger which is provided between the condenser and the evaporator, and the thermal management system further includes a heat-exchanging circuit branched from an upstream point of the heat-exchanger in the base circuit and joined to the recirculation circuit via the heat-exchanger. 
     
     
         8 . The thermal management system of  claim 7 , wherein the expansion valve includes a first expansion valve positioned at a downstream point of the heat-exchanger in the base circuit and a second expansion valve positioned at an upstream point of the heat-exchanger in the heat-exchanging circuit. 
     
     
         9 . The thermal management system of  claim 1 , wherein a gas-liquid separator is provided between the evaporator and the compressor so that the refrigerant in a gaseous state is supplied to the compressor.