Refrigeration cycle device
In a refrigeration cycle device, in an operation mode in which a refrigerant does not flows into a cooling evaporator, a throttle opening degree characteristic of a heat absorption valve disposed upstream of a heat absorption evaporator is set to cause the refrigerant on the outlet side of the heat absorption evaporator to be in a gas-liquid two-phase state.
1. A refrigeration cycle device for an air conditioner, comprising:
a compressor that compresses and discharges a refrigerant mixed with a refrigerator oil;
a heating unit that heats a ventilation air by using a heat of the refrigerant discharged from the compressor as a heat source;
a branch passage that branches a flow of a high-pressure refrigerant flowing out from the heating unit;
a cooling valve that reduces a pressure of the refrigerant flowing out from one refrigerant outflow port of the branch passage;
a cooling evaporator that evaporates the refrigerant by heat exchange between the refrigerant reduced in pressure by the cooling valve and the ventilation air;
a heat absorption valve that reduces a pressure of the refrigerant flowing out from another refrigerant outflow port of the branch passage;
a heat absorption evaporator that evaporates the refrigerant by heat exchange between the refrigerant reduced in pressure by the heat absorption valve and a heat source fluid; and
circuit switching valves that switch between a refrigerant circuit allowing the refrigerant to flow into the cooling evaporator and a refrigerant circuit preventing the refrigerant from flowing into the cooling evaporator, wherein
the heat absorption valve adjusts a throttle opening degree to cause a heat-absorption refrigerant on an outlet side of the heat absorption evaporator to be in a gas-liquid two-phase state when the circuit switching valves are switched to the refrigerant circuit that prevents the refrigerant from flowing into the cooling evaporator and a predetermined condition is satisfied.
2. The refrigeration cycle device according to claim 1 , wherein at least one of the cooling valve and the heat absorption valve is a thermal expansion valve that changes the throttle opening degree by a mechanical mechanism.
3. The refrigeration cycle device according to claim 1 , wherein the heating unit includes an interior condenser that heats the ventilation air by radiating the heat of the refrigerant discharged by the compressor to the ventilation air.
4. The refrigeration cycle device according to claim 3 , wherein the heating unit includes an exterior heating unit that radiates the heat of the refrigerant discharged by the compressor to the outside air.