Heat source unit of refrigeration system and refrigeration system

Abstract

A heat source circuit ( 12 ) includes: a first gas port ( 31 ) constantly communicating with a discharge side of a compressor ( 14 ); a second gas port ( 32 ) constantly communicating with a suction side of the compressor ( 14 ); a third gas port ( 33 ) selectively communicating with one of a first gas line ( 25 ) and a second gas line ( 26 ); a liquid port ( 34 ) constantly communicating with a liquid inlet/outlet end of a heat-source heat exchanger ( 15 ); a first switching mechanism ( 17 ) which switches a state of communication of a gas inlet/outlet end of the heat-source heat exchanger ( 15 ); and a second switching mechanism ( 18 ) which switches a state of communication of a third gas line ( 27 ).

1 . A heat source unit of a refrigeration system comprising: a heat source circuit ( 12 ) including a compressor ( 14 ) and a heat-source heat exchanger ( 15 ) connected to each other, wherein
 the heat source circuit ( 12 ) includes   a first gas port ( 31 ) which is provided at an end of a first gas line ( 25 ) constantly communicating with a discharge side of the compressor ( 14 ),   a second gas port ( 32 ) which is provided at an end of a second gas line ( 26 ) constantly communicating with a suction side of the compressor ( 14 ),   a third gas port ( 33 ) which is provided at an end of a third gas line ( 27 ) selectively communicating with one of the first gas line ( 25 ) and the second gas line ( 26 ),   a liquid port ( 34 ) which is provided at an end of a liquid line ( 28 ) constantly communicating with a liquid inlet/outlet end of the heat-source heat exchanger ( 15 ),   a first switching mechanism ( 17 ) which switches a gas inlet/outlet end of the heat-source heat exchanger ( 15 ) into communication with the discharge side of the compressor ( 14 ) or communication with the suction side of the compressor ( 14 ), and   a second switching mechanism ( 18 ) which switches the third gas line ( 27 ) into communication with the first gas line ( 25 ) or communication with the second gas line ( 26 ).   
     
     
         2 . A refrigeration system comprising:
 the heat source unit ( 10 ) of the refrigeration system ( 5 ) of  claim 1 ; and   a heat using unit ( 7 ) having a heat-using circuit ( 8 ) including a decompression mechanism ( 41 ) and a heat-using heat exchanger ( 40 ) connected to each other to be arranged in this order from a liquid inlet/outlet end of the heat-using circuit ( 8 ), wherein   a refrigerant circuit ( 9 ) is constituted by connecting the third gas port ( 33 ) of the heat source circuit ( 12 ) of the heat source unit ( 10 ) and a gas inlet/outlet end of the heat-using circuit ( 8 ), and connecting the liquid port ( 34 ) of the heat source circuit ( 12 ) and the liquid inlet/outlet end of the heat-using circuit ( 8 ), the refrigerant circuit ( 9 ) performing a vapor compression refrigeration cycle.   
     
     
         3 . The refrigeration system of  claim 2 , further comprising:
 an auxiliary unit ( 50 ) having an auxiliary heat exchanger ( 52 ), a first connection port ( 56 ) constantly communicating with a liquid inlet/outlet end of the auxiliary heat exchanger ( 52 ), a second connection port ( 57 ) and a third connection port ( 58 ) with which a gas inlet/outlet end of the auxiliary heat exchanger ( 52 ) selectively communicates, and an auxiliary switching mechanism ( 54 ) which switches the gas inlet/outlet end of the auxiliary heat exchanger ( 52 ) into communication with the second connection port ( 57 ) or communication with the third connection port ( 58 ), wherein   in the refrigerant circuit ( 9 ), the first connection port ( 56 ) is connected to the liquid port ( 34 ) of the heat source circuit ( 12 ), the second connection port ( 57 ) is connected to the first gas port ( 31 ) of the heat source circuit ( 12 ), and the third connection port ( 58 ) is connected to the second gas port ( 32 ) of the heat source circuit ( 12 ).   
     
     
         4 . The refrigeration system of  claim 2  or  3 , wherein
 a plurality of heat using units ( 7 ) are provided, and 
 in the refrigerant circuit ( 9 ), a plurality of heat-using circuits ( 8 ) connected to the heat source circuit ( 12 ) are parallel to each other. 
 
     
     
         5 . The refrigeration system of  claim 4 , further comprising:
 switching units ( 60 ) corresponding to the plurality of the heat using units ( 7 ), respectively, each of which including operation state switching mechanisms ( 63 ,  64 ) which switch a gas inlet/outlet end of the heat-using circuit ( 8 ) of the heat using unit ( 7 ) into communication with the second gas port ( 32 ) or communication with the third gas port ( 33 ).