Refrigeration cycle apparatus

Abstract

A refrigeration cycle apparatus includes: a refrigerant circuit including a compressor, a first heat exchanger, a first decompressing apparatus, a second heat exchanger, and an accumulator; and a heating unit. In the refrigerant circuit, refrigerant circulates in order of the compressor, the first heat exchanger, the first decompressing apparatus, the second heat exchanger, and the accumulator. The heating unit is configured to heat the refrigerant that returns from the accumulator to the compressor, using the refrigerant that has passed through the first heat exchanger. Preferably, the heating unit includes a third heat exchanger configured to perform heat exchange between the refrigerant running toward the first decompressing apparatus after having passed through the first heat exchanger and the refrigerant running toward the compressor after having passed through the accumulator.

1 . A refrigeration cycle apparatus, comprising:
 a refrigerant circuit including a compressor, a first heat exchanger, a first decompressing apparatus, a second heat exchanger, and an accumulator; and   a heating unit, wherein   in the refrigerant circuit, refrigerant circulates in order of the compressor, the first heat exchanger, the first decompressing apparatus, the second heat exchanger, and the accumulator, and   the heating unit is configured to heat the refrigerant that returns from the accumulator to the compressor, using the refrigerant that has passed through the first heat exchanger,   the refrigeration cycle apparatus further comprises a branch flow path configured to branch from a branch portion in a flow path running toward the first decompressing apparatus after having passed through the first heat exchanger, and merge into the refrigerant circuit at a merge portion downstream of the branch portion, in the refrigerant circuit,   the heating unit includes
 a second decompressing apparatus configured to decompress the refrigerant flowing through the branch flow path, and 
 a third heat exchanger configured to perform heat exchange between the refrigerant flowing through the branch flow path and running from the branch portion toward the second decompressing apparatus and the refrigerant running toward the compressor after having passed through the accumulator in the refrigerant circuit, 
   the merge portion is arranged in a flow path running from the second heat exchanger toward the accumulator in the refrigerant circuit.   
     
     
         2 . (canceled) 
     
     
         3 . (canceled) 
     
     
         4 . (canceled) 
     
     
         5 . (canceled) 
     
     
         6 . The refrigeration cycle apparatus according to  claim 1 , wherein
 the second decompressing apparatus is an expansion valve configured to have a variable opening degree, and   the refrigeration cycle apparatus further comprises
 a sensor arranged on a suction side or a discharge side of the compressor and configured to sense a state of the refrigerant, and 
 a controller configured to control the opening degree of the second decompressing apparatus in accordance with an output of the sensor. 
   
     
     
         7 . (canceled)