To provide a refrigeration cycle capable of securing reliability of a compressor by suppressing the rise of a discharge temperature of the compressor at the time of an overload even when it comes into a state of an overload where the discharge temperature of the compressor surpasses a predetermined reference value because of the change in an environmental temperature and the like.
A refrigeration device has a configuration in which a capillary tube 3 and a control valve 4 which is connected in parallel to the capillary tube are used as a diaphragm device, and the control valve is driven by a shape memory alloy spring, and also a refrigeration cycle is configured by using a constant speed compressor 1. Thereby, the refrigeration device can be provided in which the rise in a discharge temperature of the compressor at the time of an overload can be suppressed with a low cost configuration without using an expensive diaphragm amount variable type electric expansion valve and a capacity variable compressor and the like, reliability of the compressor can be secured, and an operation with high cycle efficiency is possible at the time of a normal operation.
KAWABE YOSHIKAZU
MARUMOTO KAZUHIKO
Daisuke Nagano
Kentaro Fujii