Refrigeration system

Abstract

A refrigeration system includes a refrigerant circuit including a chilling expansion valve, a chilling heat exchanger, a compressor ( 11 ) and an outdoor heat exchanger connected in this order to operate a vapor compression refrigeration cycle. A suction pressure sensor ( 25 ) is mounted to a suction pipe ( 61 ) of the compressor ( 11 ) through a heat taking pipe ( 90 ). The heat taking pipe ( 90 ) is joined through a heat transfer member ( 91 ) to a discharge pipe ( 64 ) of the compressor ( 11 ). The length of the heat taking pipe ( 90 ) is set to a predetermined minimum length increasing with decreasing evaporation temperature in the chilling heat exchanger or a longer length.

1 . A refrigeration system including a refrigerant circuit ( 10 ) in which an evaporator ( 16 ,  17 ), a compression mechanism ( 11 ), a condenser ( 13 ) and an expansion mechanism ( 15   a ,  15   b ) are connected in this order and further including a suction pressure sensor ( 25 ) for measuring the suction pressure of the compression mechanism ( 11 ), the suction pressure sensor ( 25 ) being connected to a suction pipe ( 61 ) of the compression mechanism ( 11 ) through a heat taking pipe ( 90 ) for making the temperature of a connecting part ( 25   b ) of the suction pressure sensor ( 25 ) higher than the temperature of the suction pipe ( 61 ). 
   
   
       2 . The refrigeration system of  claim 1 , wherein the heat taking pipe ( 90 ) is formed with a length with which the connecting part ( 25   b ) of the suction pressure sensor ( 25 ) reaches a higher temperature than the suction pipe ( 61 ) owing to the ambient temperature. 
   
   
       3 . The refrigeration system of  claim 2 , wherein the minimum length of the heat taking pipe ( 90 ) is set to a predetermined length increasing as the evaporation temperature in the evaporator ( 16 ,  17 ) decreases. 
   
   
       4 . The refrigeration system of  claim 1 , wherein the heat taking pipe ( 90 ) is attached through a heat transfer member ( 91 ) to a high-pressure side pipe ( 64 ) of the refrigerant circuit ( 10 ). 
   
   
       5 . The refrigeration system of  claim 4 , wherein the high-pressure side pipe ( 64 ) is a discharge pipe ( 64 ) of the compression mechanism ( 11 ).