To provide a refrigerating cycle capable of exerting an excellent refrigerating effect even during long-term use.
This refrigerating cycle includes at least a compressor 100, a condenser 300, an expansion valve 400, an evaporator 500, and a pipe 600 that connects them, and circulates fluid including a refrigerant and a refrigerator oil. A driving shaft 13 of the compressor 100 is formed by iron series material, and a specified sliding portion is formed at a contact part between the driving shaft 13 with an insertion portion of an oblique plate 17. The fluid is brought into contact with rubber material including sulfur, a specified sliding portion, and a corrosion preventing agent. The corrosion preventing agent is placed at positions excepting sliding portions 14, 21a, 21b, a generation Gibbs energy value during reaction for combining Fe/corrosion preventing agent with sulfur is negative, and an absolute valve of the generation Gibbs energy value of the corrosion preventing agent is smaller than an absolute valve of the generation Gibbs energy value of Fe.
KATO TAKAYUKI
SAITO ATSUSHI
INOUE MASAKI
SATO HIROAKI
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