Cooling system for vehicle equipped with refrigerant circuit operable as heat pump circuit for AC operation and operating as heat pump circuit for heating operation

摘要

The present invention relates to a vehicle cooling system (1), and a refrigerant circuit (2) operable as a cooling circuit (2.1) for AC operation and a heat pump circuit (2.2) for heating operation. , Evaporator (3), refrigerant compressor (4), heat exchanger as refrigerant condenser or gas cooler for refrigerant circuit (2.1) or heat pump evaporator for heat pump circuit (2.2) (5), a first expansion mechanism (6.1) assigned to the expander (3), and a second expansion mechanism (6) assigned to the function of the heat exchanger (5) as a heat pump evaporator. .2) and an internal heat exchanger (8) having a high pressure section (8.1) and a low pressure section (8.2), the low pressure section being fluidly connected to a downstream refrigerant compressor (4). , Is provided. In the present invention, the high pressure section (8.1) of the internal heat exchanger (8) is located in the refrigerant circuit section (2.4) connecting the second expansion mechanism (6.2) to the heat exchanger (5). To be done. [Selection diagram] Figure 1