| 摘要 |
<p>An object of the present invention is to enable the refrigerant level in a liquid receiver to be stably controlled even when the high-pressure-side refrigerant is in a subcritical state in a refrigeration device that comprises a refrigerant circuit in which a compressor, a radiator, a first expansion valve, a liquid receiver, a second expansion valve, and an evaporator are connected in sequence. The refrigeration device (1, 101) of the present invention is provided with a compression mechanism (11), a radiator (13), a first expansion mechanism (15), a liquid receiver (16), a second expansion mechanism (17, 33a, 33b), an evaporator (31, 31a, 31b), a temperature detector (22), a first pressure storing unit (23a), and a second pressure determining unit (23b), a pressure detector (21), and a control unit (23c). The first pressure storing unit stores an upper limit and lower limit of the first pressure. The second pressure determining unit determines an upper limit and lower limit of a high pressure based on an upper limit and lower limit of an intermediate pressure and on a temperature in a vicinity of an exit of the radiator. The control unit controls the first expansion mechanism and the second expansion mechanism so that a pressure detected by the pressure detector will be equal to or less than the upper limit and equal to or greater than the lower limit of the high pressure.</p> |
