Refrigeration cycle device

A refrigeration cycle device comprising:

• a compressor configured to compress and discharge a refrigerant;
• an upstream branch portion configured to branch a flow of the refrigerant discharged from the compressor;
• a heating portion configured to heat a heating target by using one refrigerant branched at the upstream branch portion as a heat source;
• at least one decompression portion configured to decompress the refrigerant flowing out from the heating portion;
• a bypass passage configured to guide another refrigerant branched at the upstream branch portion toward a suction port side of the compressor;
• a bypass flow adjustment portion configured to adjust a flow rate of the refrigerant flowing through the bypass passage;
• a first heat exchanger including a mixing portion in which a bypass side refrigerant flowing out from the bypass flow adjustment portion is mixed with a decompression-portion side refrigerant flowing out from the at least one decompression portion, the first heat exchanger being configured to exchange heat among the bypass side refrigerant, the decompression-portion side refrigerant and a heat exchange target fluid;
• and
• a heat medium circuit that circulates the heat exchange target fluid, wherein
• the mixing portion mixes the bypass side refrigerant and the decompression-portion side refrigerant to have a mixed refrigerant in which the bypass side refrigerant and the decompression-portion side refrigerant are homogeneously mixed, and to cause the mixed refrigerant to flow out to the suction port side of the compressor,
• the heat medium circuit is provided with a second heat exchanger configured to exchange heat between the heat exchange target fluid and a heat generating device that generates heat during operation,
• the heat medium circuit includes a heat medium bypass passage through which the heat exchange target fluid flowing out from the second heat exchanger flows while bypassing the first heat exchanger, and a heat medium circuit switching valve configured to switch a circuit configuration of the heat medium circuit, and
• the heat medium circuit switching valve is configured to be switched to (i) a first circuit in which the heat exchange target fluid flowing out from the second heat exchanger flows into the first heat exchanger when a temperature of the heat exchange target fluid flowing into the second heat exchanger is higher than a temperature of the refrigerant flowing out of the first heat exchanger, or to (ii) a second circuit in which the heat exchange target fluid flowing out from the second heat exchanger flows into the heat medium bypass passage when the temperature of the heat exchange target fluid flowing into the second heat exchanger is lower than the temperature of the refrigerant flowing out of the first heat exchanger.