Refrigeration apparatus

Abstract

In a refrigeration apparatus ( 1 ) for which refrigerant containing a compound represented by a molecular formula of C 3 H m F n (note that m=1-5, n=1-5, and m+n=6) is used, a compressor including a first compression mechanism ( 20 A) and a second compression mechanism ( 20 B) inside a casing ( 11 ) is used in order to reduce or prevent decomposition of refrigerant due to an increase in discharge temperature of a compressor ( 10 ) performing a compression phase of refrigerant in a refrigeration cycle.

1 . A refrigeration apparatus in which refrigerant of a refrigerant circuit ( 2 ) is single component refrigerant containing refrigerant represented by a molecular formula: C 3 H m F n  where “m” and “n” are integers equal to or greater than 1 and equal to or less than 5, and a relationship represented by an expression m+n=6 is satisfied, and having a single double bond in a molecular structure, or refrigerant mixture containing the refrigerant, the refrigeration apparatus, comprising:
 a compressor ( 10 ) for performing a compression phase of refrigerant, 
 wherein the compressor ( 10 ) includes a first compression mechanism ( 20 A) and a second compression mechanism ( 20 B) inside a casing ( 11 ). 
 
     
     
         2 . The refrigeration apparatus of  claim 1 , wherein
 the first compression mechanism ( 20 A) of the compressor ( 10 ) is a lower-stage compression mechanism ( 20 L), and the second compression mechanism ( 20 B) is a higher-stage compression mechanism ( 20 H); and   both of the compression mechanisms ( 20 A,  20 B) serve as a two-stage compression mechanism ( 20 L,  20 H) for compressing refrigerant at two stages.   
     
     
         3 . The refrigeration apparatus of  claim 1 , wherein
 the compression mechanism ( 20 A,  20 B) is a swing piston type compression mechanism which includes a cylinder ( 21 L,  21 H) having a cylinder chamber ( 25 ), and a swing piston ( 28 ) orbiting along an inner circumferential surface of the cylinder ( 21 L,  21 H); in which a blade ( 28   b ) outwardly protruding in a radial direction is formed in the swing piston ( 28 ); and in which support members ( 29 ) for holding the blade ( 28   b ) so as to move the blade ( 28   b ) back and forth are rotatably held by the cylinder ( 21 L,  21 H).   
     
     
         4 . The refrigeration apparatus of  claim 1 , wherein
 the refrigerant represented by the molecular formula: C 3 H m F n , where “m” and “n” are the integers equal to or greater than 1 and equal to or less than 5, and the relationship represented by the expression m+n=6 is satisfied, and having the single double bond in the molecular structure is 2,3,3,3-tetrafluoro-1-propene.   
     
     
         5 . The refrigeration apparatus of  claim 1 , wherein
 the refrigerant of the refrigerant circuit ( 2 ) is refrigerant mixture further containing difluoromethane.   
     
     
         6 . The refrigeration apparatus of  claim 1 , wherein
 the refrigerant of the refrigerant circuit ( 2 ) is refrigerant mixture further containing pentafluoroethane.