Refrigeration cycle device

Abstract

The refrigeration cycle device includes a control device controlling a compressor of a refrigeration cycle circuit allowing circulation of a working medium containing ethylene-based fluoroolefin as a refrigerant component. The compressor includes: a sealed container constituting a fluidic pathway for the working medium; and a compression mechanism and an electric motor inside the sealed container. The control device includes: a drive circuit driving the electric motor; a state detection circuit detecting a state of at least one of the compressor or the drive circuit; a temperature measurement circuit measuring an internal temperature of the sealed container; and a control circuit controlling the drive circuit. The control circuit (stops operation of the drive circuit during a state where an abnormality of at least one of the compressor or the drive circuit has been detected based on the state and the internal temperature has exceeded a predetermined temperature.

1 . A refrigeration cycle device comprising:
 a refrigeration cycle circuit including a compressor, a condenser, an expansion valve and an evaporator, and allowing circulation of a working medium; and   a control device configured to control the compressor of the refrigeration cycle circuit,   the working medium containing ethylene-based fluoroolefin as a refrigerant component,   the compressor including
 a sealed container constituting a fluidic pathway for the working medium, 
 a compression mechanism positioned inside the sealed container to compress the working medium, and 
 an electric motor positioned inside the sealed container to operate the compression mechanism, 
   the control device including
 a drive circuit configured to drive the electric motor, 
 a state detection circuit configured to detect a state of at least one of the compressor or the drive circuit, 
 a temperature measurement circuit configured to measure an internal temperature of the sealed container of the compressor, and 
 a control circuit configured to control the drive circuit, and 
   the control circuit being configured to stop operation of the drive circuit during a state where an abnormality of at least one of the compressor or the drive circuit has been detected based on the state detected by the state detection circuit and the internal temperature measured by the temperature measurement circuit has exceeded a predetermined temperature.   
     
     
         2 . The refrigeration cycle device according to  claim 1 , wherein the control circuit is configured to:
 in response to detection of the abnormality, stop the operation of the drive circuit;   subsequent to stop of the operation of the drive circuit, determine whether or not the internal temperature measured by the temperature measurement circuit exceeds the predetermined temperature; and   when the internal temperature measured by the temperature measurement circuit exceeds the predetermined temperature, continues the stop of the operation of the drive circuit, and when the internal temperature measured by the temperature measurement circuit is equal to or lower than the predetermined temperature, restart the operation of the drive circuit.   
     
     
         3 . The refrigeration cycle device according to  claim 2 , wherein the control circuit is configured to:
 count a number of times of detection of the abnormality; and   when the number of times of detection exceeds a predetermined number of times corresponding to the abnormality, stop the operation of the drive circuit.   
     
     
         4 . The refrigeration cycle device according to  claim 1   3 , wherein:
 the state includes a current value of a current flowing through the drive circuit;   the abnormality includes an electric abnormality of the drive circuit; and   the control circuit is configured to detect the electric abnormality in response to a situation where the current value of the current flowing through the drive circuit detected by the state detection circuit exceeds a predetermined current value.   
     
     
         5 . The refrigeration cycle device according to  claim 1 , wherein:
 the state includes at least one of a phase current of the compressor or a rotational frequency of the electric motor of the compressor;   the abnormality includes an abnormality relating to layer short of the compressor; and   the control circuit is configured to detect the abnormality relating to the layer short of the compressor in response to at least one of imbalance of the phase current of the compressor or a deviation of the rotational frequency of the electric motor of the compressor.   
     
     
         6 . The refrigeration cycle device according to  claim 1 , wherein the predetermined temperature is lower than a safety temperature of the working medium and is lower than a heatproof temperature of the electric motor of the compressor. 
     
     
         7 . The refrigeration cycle device according to  claim 1 , wherein
 the ethylene-based fluoroolefin contains ethylene-based fluoroolefin likely to undergo a disproportionation reaction.   
     
     
         8 . The refrigeration cycle device according to  claim 1 , wherein
 the ethylene-based fluoroolefin is 1,1,2-trifluoroethylene, trans-1,2-difluoroethylene, cis-1,2-difluoroethylene, 1,1-difluoroethylene, tetrafluoroethylene, or monofluoroethylene.   
     
     
         9 . The refrigeration cycle device according to  claim 1 , wherein
 the working medium contains difluoromethane as the refrigerant component.   
     
     
         10 . The refrigeration cycle device according to  claim 1 , wherein the working medium further contains a saturated hydrocarbon. 
     
     
         11 . The refrigeration cycle device according to  claim 1 , wherein
 the working medium contains a haloalkane with 1 or 2 carbon atoms as a disproportionation inhibitor for suppressing a disproportionation reaction of the ethylene-based fluoroolefin.   
     
     
         12 . The refrigeration cycle device according to  claim 10 , wherein
 the saturated hydrocarbon contains n-propane.