Outdoor unit of refrigeration system

Abstract

In an outdoor unit, first through third intermediate heat exchangers and an outdoor heat exchanger are disposed to stand along an air inlet of an outdoor casing, and the outdoor heat exchanger is located above the first through third intermediate heat exchangers.

1 . An outdoor unit of a refrigeration system, the outdoor unit comprising:
 a multistage compressor including a plurality of serially connected compression mechanisms in which refrigerant discharged from a low-stage one of the compression mechanisms is sucked and compressed in a high-stage one of the compression mechanisms;   an intermediate heat exchanger located between adjacent two of the compression mechanisms and configured to cause refrigerant flowing from the low-stage compression mechanism to the high-stage compression mechanism to exchange heat with outdoor air to be cooled;   an outdoor heat exchanger configured to cause refrigerant discharged from the highest-stage compression mechanism to exchange heat with outdoor air; and   a casing having a side surface in which an air suction port is provided and an upper surface in which an air outlet is provided, and housing the compression mechanisms, the intermediate heat exchanger, and the outdoor heat exchanger, wherein   the intermediate heat exchanger and the outdoor heat exchanger are disposed to stand along the suction port of the casing, and the outdoor heat exchanger is located above all the intermediate heat exchanger.   
     
     
         2 . The outdoor unit of  claim 1 , wherein
 the multistage compressor includes three or more compression mechanisms,   the intermediate heat exchanger comprises a plurality of intermediate heat exchangers, and   the highest-stage intermediate heat exchanger is located above the other intermediate heat exchangers and below the outdoor heat exchanger.   
     
     
         3 . The outdoor unit of  claim 2 , wherein
 the intermediate heat exchangers are stacked from the bottom in the order of increasing pressure of inflow refrigerant.   
     
     
         4 . The outdoor unit of  claim 1 , wherein
 the intermediate heat exchanger includes a plurality of flat tubes which are arranged in an up and down direction with their side surfaces facing one another and each of which includes a plurality of fluid passage extending in a tube length direction, and also includes a plurality of fins dividing space between adjacent ones of the flat tubes into a plurality of air passages in which air flows.   
     
     
         5 . The outdoor unit of  claim 4 , wherein
 the outdoor heat exchangers includes a plurality of flat tubes which are arranged in the up and down direction with their side surfaces facing one another, and each of which includes a plurality of fluid passage extending in a tube length direction, and also includes a plurality of fins dividing space between adjacent ones of the flat tubes into a plurality of air passages in which air flows.