Refrigeration system

Abstract

A refrigeration system includes a compression mechanism, a radiator, an expansion mechanism, an evaporator and a π-type silencer 20 . The π-type silencer includes a first silencing space, a second silencing space and a first communication path. The first communication path allows the first silencing space and the second silencing space to be communicated. Additionally, the π-type silencer is incorporated in at least one of a section between a refrigerant discharge side of the compression mechanism and an inlet side of the radiator, and a section between an outlet side of the evaporator and a refrigerant suction side of the compression mechanism.

1 . A refrigeration system filled with carbon dioxide as a refrigerant, the refrigeration system comprising:
 a compression mechanism configured to compress the refrigerant;   a radiator configured to radiate heat from the refrigerant that is discharged from the compression mechanism;   an expansion mechanism configured to depressurize the refrigerant that flows out from the radiator;   an evaporator configured to evaporate the refrigerant that flows out from the expansion mechanism; and   a π-type silencer that includes a first silencing space, a second silencing space and a first communication path that allows the first silencing space and the second silencing space to be communicated,   the π-type silencer being incorporated in at least one of
 a section between a refrigerant discharge side of the compression mechanism and an inlet side of the radiator, and 
 a section between an outlet side of the evaporator and a refrigerant suction side of the compression mechanism. 
   
     
     
         2 . The refrigeration system according to  claim 1 , wherein
 the compression mechanism is a rotary compression mechanism, and   a length of the first communication path is longer than S 1 /2(1/V 1 +1/V 2 )(c/πN min ) 2  (where S 1  is a cross-sectional area of the first communication path, V 1  is a volume of the first silencing space, V 2  is a volume of the second silencing space, c is a speed of N min  sound in the refrigerant, π is pi, and is a minimum number of rotations of the rotary compression mechanism).   
     
     
         3 . The refrigeration system according to  claim 1 , wherein
 a length of the first communication path is shorter than c/2f t  (where c is a speed of sound in the refrigerant and f t  is a target reduction highest frequency).   
     
     
         4 . The refrigeration system according to  claim 1 , wherein
 the first silencing space is a space inside an oil separator or an accumulator.   
     
     
         5 . The refrigeration system according to  claim 1 , wherein
 the π-type silencer further includes a third silencing space and a second communication path that allows the second silencing space and the third silencing space to be communicated.   
     
     
         6 . The refrigeration system according to  claim 2 , wherein
 the length of the first communication path is shorter than c/2f t  (where c f t  is a target reduction highest frequency).   
     
     
         7 . The refrigeration system according to  claim 6 , wherein
 the first silencing space is a space inside an oil separator or an accumulator.   
     
     
         8 . The refrigeration system according to  claim 7 , wherein
 the π-type silencer further includes a third silencing space and a second communication path that allows the second silencing space and the third silencing space to be communicated.   
     
     
         9 . The refrigeration system according to  claim 6 , wherein
 the π-type silencer further includes a third silencing space and a second communication path that allows the second silencing space and the third silencing space to be communicated.   
     
     
         10 . The refrigeration system according to  claim 2 , wherein
 the first silencing space is a space inside an oil separator or an accumulator.   
     
     
         11 . The refrigeration system according to  claim 10 , wherein
 the π-type silencer further includes a third silencing space and a second communication path that allows the second silencing space and the third silencing space to be communicated.   
     
     
         12 . The refrigeration system according to  claim 2 , wherein
 the π-type silencer further includes a third silencing space and a second communication path that allows the second silencing space and the third silencing space to be communicated.   
     
     
         13 . The refrigeration system according to  claim 3 , wherein
 the first silencing space is a space inside an oil separator or an accumulator.   
     
     
         14 . The refrigeration system according to  claim 13 , wherein
 the π-type silencer further includes a third silencing space and a second communication path that allows the second silencing space and the third silencing space to be communicated.   
     
     
         15 . The refrigeration system according to  claim 3 , wherein
 the π-type silencer further includes a third silencing space and a second communication path that allows the second silencing space and the third silencing space to be communicated.   
     
     
         16 . The refrigeration system according to  claim 4 , wherein
 the π-type silencer further includes a third silencing space and a second communication path that allows the second silencing space and the third silencing space to be communicated.