Heat source unit and air-conditioning device

An air conditioner configured to perform a cooling operation, a heating operation, and a simultaneous cooling and heating operation, said air conditioner comprising a heat source unit, wherein

• the heat source unit is connected to a first flow path switching unit and a second flow path switching unit through a liquid connection pipe, a high and low pressure gas connection pipe, and a low pressure gas connection pipe,
• the first flow path switching unit corresponds to a first utilization unit, the second flow path switching unit corresponds to a second utilization unit,
• the heat source unit comprises:
• a compressor configured to compress a refrigerant;
• a first heat exchange section configured to exchange heat between the refrigerant and air;
• a second heat exchange section configured to exchange heat between the refrigerant and the air;
• a liquid line connected to a liquid end of the first heat exchange section and a liquid end of the second heat exchange section, the liquid line being provided with a receiver configured to accumulate the refrigerant;
• a first switching valve configured to switch between a first state where the first switching valve brings a discharge side of the compressor and the high and low pressure gas connection pipe into communication with each other and a second state where the first switching valve brings the high and low pressure gas connection pipe and a suction side of the compressor into communication with each other;
• a second switching valve configured to switch between a third state where the second switching valve brings the discharge side of the compressor and a gas end of the first heat exchange section into communication with each other and a fourth state where the second switching valve brings the suction side of the compressor and the gas end of the first heat exchange section into communication with each other;
• a refrigerant flow path provided with the second heat exchange section, the refrigerant flow path having two ends respectively connected to the discharge side of the compressor and a portion of the liquid line upstream of the receiver;
• and
• the second heat exchange section is configured to function as a radiator during the heating operation, wherein the heating operation is an operation in which, in response to one utilization unit in an operating state, the one utilization unit in the operating state performs a heating action, and in response to a plurality of utilization units in an operating state, all of the plurality of utilization units in the operating state perform a heating action.