JPWO2022003933A5 - - Google Patents

Claims (5)

A cold heat source unit of a refrigeration cycle device configured to be connected to a load device,
a coolant channel that is connected to the load device to form a circulation channel in which coolant circulates;
a compressor arranged in the refrigerant flow path;
an oil separator arranged on the discharge port side of the compressor in the refrigerant flow path;
an oil return path returning refrigerating machine oil from the oil separator to the compressor;
a flow regulating device arranged in the oil return path and configured to be able to adjust the flow rate of the fluid flowing through the oil return path;
a temperature sensor arranged downstream of the flow rate adjusting device in the oil return path;
A control device that controls the opening of the flow rate adjusting device according to the output of the temperature sensor ,
The flow rate adjusting device is configured to be able to change the degree of opening,
When the difference between the temperature detected by the temperature sensor and the ambient temperature is smaller than the judgment value, the control device increases the degree of opening of the flow rate adjusting device within a variable range, and then the difference becomes the judgment value. A cold source unit that determines whether it is less than 2. The cold source unit of claim 1, wherein the flow regulator comprises an electronic expansion valve. The cold heat source unit according to claim 1 , wherein the control device issues a warning that the oil return path is clogged when the degree of opening of the flow regulating device reaches an upper limit value. The cold heat source unit according to claim 1, wherein the refrigerant is carbon dioxide. A refrigeration cycle apparatus comprising the cold heat source unit according to any one of claims 1 to 4 and the load device.