Refrigerated air freight container

Abstract

An electrically powered air freight container ( 1 ) includes an insulated housing ( 2 ) and a refrigeration unit ( 3 ). The refrigeration unit ( 3 ) is powered by a voltage and frequency converter which receives electrical power at one voltage and frequency and converts that power to a voltage and frequency which is appropriate to power the refrigeration unit ( 3 ).

1 . A refrigerated air freight container which includes: 
 an insulated housing having an interior region;    a refrigerator unit which is mounted on the housing for refrigerating the interior region of the housing, which refrigerator unit includes: 
 an electrically powered compressor which operates at a given power supply voltage and frequency; 
 evaporator means; and  
 condenser means,  
 
   the refrigerated air freight container further including a voltage and frequency converter which receives electrical power at a first voltage and frequency and converts that electrical power to a second voltage and frequency which is the given power supply voltage and frequency of the compressor.    
     
     
         2 . A refrigerated air freight container as claimed in  claim 1  wherein the first voltage which is received by the voltage converter may be within a range of voltages.  
     
     
         3 . A refrigerated air freight container as claimed in  claim 2  wherein the range of voltages includes 240 volts and 115 volts.  
     
     
         4 . A refrigerated air freight container as claimed in any one of the preceding claims wherein the first frequency which is received by the voltage converter may be within a range of frequencies.  
     
     
         5 . A refrigerated air freight container as claimed in any one of the preceding claims wherein the second voltage and frequency may be direct current.  
     
     
         6 . A refrigerated air freight container as claimed in any one of the preceding claims wherein the refrigerator unit is removably mounted on the housing.