Refrigeration device

Abstract

An object is to, upon occurrence of a disproportionation reaction of a refrigerant, suppress impacts of the disproportionation reaction in a refrigeration cycle. A refrigeration device of the present disclosure includes a compressor, a heat source-side heat exchanger, a use-side heat exchanger, an expansion mechanism, a switching valve that switches between a heating operation state in which the use-side heat exchanger is caused to operate as a condenser and a cooling operation state in which the heat source-side heat exchanger is caused to operate as a condenser, and a control device. A working medium containing an ethylene-based fluoroolefin is used as a refrigerant. Upon detecting, in the heating operation state, that pressure of the working medium in a high pressure part including the compressor and the condenser has increased to a threshold value or higher, the control device controls the switching valve so as to switch operation from the heating operation state to the cooling operation state.

1 . A refrigeration device comprising: a compressor, a heat source-side heat exchanger, a use-side heat exchanger, an expansion mechanism, a switching valve that switches between a heating operation state in which the use-side heat exchanger is caused to operate as a condenser and a cooling operation state in which the heat source-side heat exchanger is caused to operate as a condenser, and a control device, wherein
 a working medium containing an ethylene-based fluoroolefin is used as a refrigerant, and   upon detecting, in the heating operation state, that pressure of the working medium in a high pressure part including the compressor and the condenser has increased to a threshold value or higher, the control device controls the switching valve so as to switch operation from the heating operation state to the cooling operation state.   
     
     
         2 . The refrigeration device according to  claim 1 , wherein
 the expansion mechanism includes an expansion valve positioned at an exit of the condenser, and   upon detecting that the pressure of the working medium in the high pressure part including the compressor and the condenser has increased to the threshold value or higher, the control device causes the expansion valve to operate in a closing direction to a first opening degree, and subsequently, when the pressure increase of the working medium in the high pressure part has stopped, causes the expansion valve to operate in the closing direction to a second opening degree.   
     
     
         3 . The refrigeration device according to  claim 1 , wherein
 a discharge pipe through which the compressor discharges compressed refrigerant is provided with pressure releasing means for releasing pressure when the pressure of the discharge pipe is equal to or higher than a set pressure value.