Refrigeration unit for refrigerated vehicle

Abstract

A sub-engine ( 30 ), a compressor ( 40 ) driven by the sub-engine ( 30 ), and a refrigeration circuit ( 70 ) connected to the compressor ( 40 ) and operable in a vapor compression refrigeration cycle are provided, and the interior of a refrigerator ( 13 ) of a refrigerated vehicle ( 10 ) is cooled. A rotational speed control unit ( 91 ) for linearly controlling fluctuations in the rotational speed of the sub-engine ( 30 ) such that the refrigeration capacity grows or declines in response to a refrigeration load is provided. A battery ( 51 ) for storing electric power and an electric generator ( 50 ) for generating electric power by the rotational drive of the refrigerating engine ( 30 ) to store the generated electric power in the battery ( 51 ) are provided. A fan motor ( 7 a ) for the refrigeration circuit ( 70 ) is selectively connectable to the electric generator ( 50 ) and the battery ( 51 ) such that power is fed from one of the electric generator ( 50 ) and the battery ( 51 ) to the fan motor ( 7 a ).

1 . A refrigerated vehicle refrigeration unit for cooling the interior of a refrigerator ( 13 ) of a refrigerated vehicle ( 10 ), the refrigeration unit including: a refrigerating engine ( 30 ); a compressor ( 40 ) driven by the refrigerating engine ( 30 ); and a refrigeration circuit ( 70 ) connected to the compressor ( 40 ) and operable in a vapor compression refrigeration cycle, wherein
 the refrigerated vehicle refrigeration unit comprises a rotational speed controller ( 91 ) for linearly controlling fluctuations in a rotational speed of the refrigerating engine ( 30 ) such that a refrigeration capacity grows or declines in response to a refrigeration load.   
     
     
         2 . A refrigerated vehicle refrigeration unit for cooling the interior of a refrigerator ( 13 ) of a refrigerated vehicle ( 10 ), the refrigeration unit including: a refrigerating engine ( 30 ); a compressor ( 40 ) driven by the refrigerating engine ( 30 ); and a refrigeration circuit ( 70 ) connected to the compressor ( 40 ) and operable in a vapor compression refrigeration cycle, wherein
 the refrigerated vehicle refrigeration unit comprises a battery ( 51 ) for storing electric power; and an electric generator ( 50 ) for generating electric power by the rotational drive of the refrigerating engine ( 30 ) to store the generated electric power in the battery ( 51 ) and rotating by the electric power of the battery ( 51 ) to develop torque, and   the refrigerating engine ( 30 ) is disconnectably connected to the compressor ( 40 ), and the electric generator ( 50 ) is connected to the compressor ( 40 ).   
     
     
         3 . The refrigerated vehicle refrigeration unit of  claim 1  further comprising:
 a battery ( 51 ) for storing electric power; and   an electric generator ( 50 ) for generating electric power by the rotational drive of the refrigerating engine ( 30 ) to store the generated electric power in the battery ( 51 ),   wherein a fan motor ( 7   a ) for the refrigeration circuit ( 70 ) is selectively connectable to the electric generator ( 50 ) and the battery ( 51 ) such that power is fed from at least one of the electric generator ( 50 ) and the battery ( 51 ) to the fan motor ( 7   a ).   
     
     
         4 . The refrigerated vehicle refrigeration unit of  claim 1  further comprising:
 a battery ( 51 ) for storing electric power; and   an electric generator ( 50 ) for generating electric power by the rotational drive of the refrigerating engine ( 30 ) to store the generated electric power in the battery ( 51 ) and rotating by the electric power of the battery ( 51 ) to develop torque,   wherein the refrigerating engine ( 30 ) is disconnectably connected to the compressor ( 40 ), and the electric generator ( 50 ) is disconnectably connected to the compressor ( 40 ).   
     
     
         5 . The refrigerated vehicle refrigeration unit of  claim 1  or  2 , wherein
 the compressor ( 40 ) comprises a plurality of compressors ( 40 ), and the plurality of compressors ( 40 ) are connected in parallel and connected to the refrigeration circuit ( 70 ).   
     
     
         6 . The refrigerated vehicle refrigeration unit of  claim 1  or  2  further comprising
 an auxiliary motor ( 60 ) disconnectably connected to the compressor ( 40 ) and driven by electric power of an external power source.   
     
     
         7 . The refrigerated vehicle refrigeration unit of  claim 2  or  3 , wherein
 the electric generator ( 50 ) is selectively connectable to an external power source and the battery ( 51 ).