Refrigeration cycle device

Abstract

A refrigeration cycle device according to an embodiment includes a main circuit, a check valve, and a control unit. The main circuit connects a compressor, a first heat exchanger, an expansion device, and a second heat exchanger in a loop to allow a refrigerant to flow thereto. A downstream side in a flow direction of the refrigerant is defined as a first side and an upstream side in the flow direction of the refrigerant is defined as a second side. The check valve is provided in the main circuit on the first side of the compressor. The control unit controls execution of a pressure reduction operation when a predetermined condition is satisfied and an operation of the compressor is stopped. The pressure reduction operation is an operation of reducing a first pressure of the main circuit on the first side of the check valve.

What is claimed is: 
     
         1 . A refrigeration cycle device, comprising:
 a main circuit that connects a compressor, a first heat exchanger, an expansion device, and a second heat exchanger in a loop to allow a refrigerant to flow thereto;   a check valve provided in the main circuit on a first side of the compressor when a downstream side in a flow direction of the refrigerant is defined as the first side and an upstream side in the flow direction of the refrigerant is defined as a second side; and   a control unit configured to control execution of a pressure reduction operation of reducing a first pressure of the main circuit on the first side of the check valve when a predetermined condition is satisfied and an operation of the compressor is stopped.   
     
     
         2 . The refrigeration cycle device according to  claim 1 , wherein
 the predetermined condition is a condition in which a drive current of the compressor exceeds a first predetermined value.   
     
     
         3 . The refrigeration cycle device according to  claim 1 , wherein
 the predetermined condition is a condition in which the first pressure exceeds a second predetermined value.   
     
     
         4 . The refrigeration cycle device according to  claim 1 , wherein
 the predetermined condition is a condition in which an outside air temperature exceeds a third predetermined value during a cooling operation of the refrigeration cycle device.   
     
     
         5 . The refrigeration cycle device according to  claim 1 , further comprising:
 a bypass circuit that connects a first position of the main circuit on the first side of the check valve and a second position of the main circuit on the second side of the compressor; and   a bypass circuit opening-closing device provided in the bypass circuit, wherein   the pressure reduction operation is an operation of opening the bypass circuit opening-closing device.   
     
     
         6 . The refrigeration cycle device according to  claim 5 , wherein
 the expansion device includes a first expansion device and a second expansion device positioned on the first side of the first expansion device,   the first position is a position between the first heat exchanger and the second expansion device, and   the second position is a position between the second heat exchanger and the compressor.   
     
     
         7 . The refrigeration cycle device according to  claim 5 , wherein
 the bypass circuit is a subcooling circuit.   
     
     
         8 . The refrigeration cycle device according to  claim 1 , further comprising a fan causing outdoor air to flow through the first heat exchanger, wherein
 the pressure reduction operation is an operation of operating the fan.   
     
     
         9 . The refrigeration cycle device according to  claim 1 , wherein
 a plurality of outdoor units each including the compressor, the check valve, and one of the first heat exchanger and the second heat exchanger are connected in parallel to an indoor unit including the other of the first heat exchanger and the second heat exchanger.