Refrigeration cycle device

1. A refrigeration cycle device comprising:

a compressor configured to compress a low-pressure refrigerant drawn from a suction port such that the low-pressure refrigerant becomes a high-pressure refrigerant and to discharge the high-pressure refrigerant from a discharge port, the compressor having an intermediate pressure port through which an intermediate-pressure refrigerant in a cycle flows into the compressor and joins the refrigerant in a compression process;

a heater device configured to heat a heat exchange target fluid using the high-pressure refrigerant discharged from the discharge port of the compressor as a heat source;

a high-stage side decompressor configured to decompress the high-pressure refrigerant flowing out of the heater device such that the high-pressure refrigerant becomes the intermediate-pressure refrigerant;

a gas-liquid separator configured to

separate the intermediate-pressure refrigerant decompressed at the high-stage side decompressor into a gas refrigerant and a liquid refrigerant and

allow the gas-refrigerant to flow to the intermediate pressure port of the compressor;

a refrigerant branch portion configured to divide a flow of the liquid refrigerant separated by the gas-liquid separator into one flow and another flow;

a first decompressor configured to decompress the liquid refrigerant of the one flow such that the liquid refrigerant becomes the low-pressure refrigerant;

a first evaporator configured to

evaporate the low-pressure refrigerant decompressed by the first decompressor by allowing the low-pressure refrigerant to absorb heat of the heat exchange target fluid and

allow the evaporated refrigerant to flow to the suction port of the compressor;

a second decompressor configured to decompress the liquid refrigerant of the other flow such that the liquid refrigerant becomes the low-pressure refrigerant; and

a second evaporator configured to

evaporate the low-pressure refrigerant decompressed by the second decompressor by allowing the low-pressure refrigerant to absorb heat of an external heat source and

allow the evaporated refrigerant to flow to the suction port of the compressor, wherein

in a cooling mode for cooling the heat exchange target fluid, a refrigerant circuit is switched such that the low-pressure refrigerant flows from the refrigerant branch portion into the first evaporator, and

in a heating mode for heating the heat exchange target fluid, the refrigerant circuit is switched such that the low-pressure refrigerant flows from the refrigerant branch portion into the second evaporator.

2. The refrigeration cycle device according to claim 1 , wherein

the external heat source is an outside air.

3. The refrigeration cycle device according to claim 2 , further comprising:

a third evaporator connected to the refrigerant branch portion in parallel with the second evaporator, wherein

the third evaporator is configured to

evaporate the liquid refrigerant of the other flow by allowing the liquid refrigerant to absorb heat of a heat generating device configured to generate heat during operation and

allow the evaporated refrigerant to flow to the suction port of the compressor, and

in the heating mode, the refrigerant circuit is switched such that the low-pressure refrigerant flows from the refrigerant branch portion into at least one of the second evaporator or the third evaporator.

4. The refrigeration cycle device according to claim 1 , wherein

the external heat source is a heat generating device configured to generate heat during operation.

5. The refrigeration cycle device according to claim 1 , wherein

the second evaporator constitutes a part of a heat medium circuit in which a heat medium circulates,

the heat medium circuit includes a heat exchanger configured to exchange heat between the heat medium and the external heat source,

the heat exchanger is configured to allow the heat medium to absorb the heat of the external heat source in the heating mode,

the second evaporator is configured to allow the refrigerant flowing through the second evaporator to absorb heat of the heat medium.

6. The refrigeration cycle device according to claim 1 , wherein

the heater device is configured to supply heat for heating the heat exchange target fluid by causing the high-pressure refrigerant discharged from the discharge port of the compressor to release heat of the high-pressure refrigerant in the heating mode.

7. The refrigeration cycle device according to claim 6 , wherein

the heater device includes

a heat medium passage through which the heat medium flows,

a medium-refrigerant heat exchanger configured to exchange heat between the high-pressure refrigerant discharged from the discharge port of the compressor and the heat medium flowing through the heat medium passage, and

a heater core configured to exchange heat between the heat medium and the heat exchange target fluid in the heating mode.

8. The refrigeration cycle device according to claim 6 , wherein

the heater device includes

a heat medium passage through which the heat medium flows,

a medium-refrigerant heat exchanger configured to exchange heat between the high-pressure refrigerant discharged from the discharge port of the compressor and the heat medium flowing through the heat medium passage, and

a radiator configured to release excess heat of the heat medium to an outside air in the cooling mode.

9. The refrigeration cycle device according to claim 1 , wherein a refrigerant flow rate proportion is a proportion of a flow rate of the refrigerant drawn into the compressor from the suction port in a flow rate of the refrigerant discharged from the discharge port of the compressor, the refrigeration cycle device further comprises: a controller configured to control the first decompressor and the second compressor such that the refrigerant flow rate proportion in the heating mode is smaller than the refrigerant flow rate proportion in the cooling mode.