Patent ID: 9689589
Date: 2017-06-27
CPC Classifications: F25B

Claim:
1. A refrigeration apparatus comprising: a refrigerant circuit configured by connecting at least two heat-source units in parallel with usage units, the usage units having a usage-side heat exchanger and a usage-side motor-operated valve, the heat-source units having at least a first heat-source unit and a second heat-source unit, the first heat-source unit having a first compressor, a first heat-source-side heat exchanger, a first high-pressure receiver, a first detecting element arranged and configured to detect a predetermined pre-flooding state of refrigerant in the first high-pressure receiver, a first bypass channel arranged and configured to return refrigerant positioned at a top part in the first high-pressure receiver to an intake side of the first compressor, and a first motor-operated valve provided on the first bypass channel, the second heat-source unit having a second compressor, a second heat-source-side heat exchanger, a second high-pressure receiver, a second detecting element arranged and configured to detect a predetermined pre-flooding state of refrigerant in the second high-pressure receiver, a second bypass channel arranged and configured to return refrigerant positioned at a top part in the second high-pressure receiver to an intake side of the second compressor, and a second motor-operated valve provided on the second bypass channel, and a controller being provided to perform excess refrigerant distribution control in which an opening degree of the first motor-operated valve is controlled so as to be greater than an opening degree of the second motor-operated valve when the second detecting element detects the predetermined pre-flooding state of refrigerant in the second high-pressure receiver, and the opening degree of the second motor-operated valve is controlled so as to be greater than the opening degree of the first motor-operated valve when the first detecting element detects the predetermined pre-flooding state of refrigerant in the first high-pressure receiver, when the excess refrigerant distribution control is performed, the controller does not close the first motor-operated valve even when the first detecting element detects the predetermined pre-flooding state of refrigerant in the first high-pressure receiver, and does not close the second motor-operated valve even when the second detecting element detects the predetermined pre-flooding state of refrigerant in the second high-pressure receiver.