| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a refrigerating device for containers which suppresses damages of a compressor and a refrigerator oil while suppressing degradation of efficiency. <P>SOLUTION: The refrigerating device for containers includes a branching path (23) provided with a supercooling expansion valve (48), and a supercooling heat exchanger (44). The refrigerating device for containers includes a main expansion valve control part (83), a supercooling expansion valve control part (84), and a protection control part (85). When a temperature of a discharge refrigerant of the compressor (30) becomes higher than a predetermined allowable upper limit, the protection control part (85) forcibly increases an opening of the main expansion valve (32) in place of the main expansion valve control part (83) if a cooling capability required in an evaporator (33) is in a state where a higher capability than a predetermined value is required and an intake refrigerant of the compressor (30) is not in a predetermined wet state, and meanwhile, forcibly increases an opening of the supercooling expansion valve (48) in place of the supercooling expansion valve control part (84) if the cooling capability is not in a state where no higher capability is required and if the cooling capability is in a state where a higher capability is required and the intake refrigerant of the compressor (30) is in the predetermined wet state. <P>COPYRIGHT: (C)2012,JPO&INPIT |
