Patent ID: 8181480

Claim:
A refrigeration device comprising: a compression mechanism configured to compress a refrigerant; a radiator connected to a refrigerant discharge side of said compression mechanism; a first expansion mechanism connected to an exit side of said radiator; a second expansion mechanism connected to a refrigerant outflow side of said first expansion mechanism; an evaporator connected to the refrigerant outflow side of said second expansion mechanism and to a refrigerant intake side of said compression mechanism; a first internal heat exchanger configured to cause heat to be exchanged between refrigerant flowing in a first refrigerant pipe and refrigerant flowing in a second refrigerant pipe, the first refrigerant pipe connecting the exit side of said radiator and an inflow side of said first expansion mechanism, and the second refrigerant pipe connecting the exit side of said evaporator and the refrigerant inflow side of said compression mechanism; a branch pipe branching from a third refrigerant pipe and merging with said second refrigerant pipe, said third refrigerant pipe connecting the exit side of said radiator and a refrigerant inflow side of said second expansion mechanism; a third expansion mechanism provided in said branch pipe; a second internal heat exchanger configured to cause heat to be exchanged between refrigerant flowing out from said first expansion mechanism and refrigerant flowing out from said third expansion mechanism; and a liquid receiver arranged between the refrigerant outflow side of said first expansion mechanism and an inflow port for refrigerant flowing through said first refrigerant pipe of said second internal heat exchanger, said branch pipe merging with said second refrigerant pipe so that refrigerant flowing out from said third expansion mechanism and undergoing heat exchange in said second internal heat exchanger merges with refrigerant flowing through said second refrigerant pipe before flowing into said first internal heat exchanger.