COOLING DEVICE

To provide a cooling device capable of securely protecting a heat exchanger disposed in a low-pressure system from pressure change of refrigerant gas with high responsiveness.SOLUTION: A cooling device 1 includes: a compressor C for compressing refrigerant gas sucked from a low-pressure system; a cooler 3 for cooling refrigerant gas compressed by the compressor C and discharged to a high-pressure system; an expander E for expanding the refrigerant gas cooled by the cooler 3; and a heat exchanger 5 for cooling a cooling target by using the refrigerant gas expanded by the expander E and discharged to the low-pressure system. The cooling device also includes at least: a sealed container 6 in which the refrigerant is sealed; a low-pressure connection passage 6b for connecting the sealed container 6 and the low-pressure system; and a low-pressure on-off valve 9 for opening/closing the low-pressure connection passage 6b. The low-pressure connection passage 6b is connected to the low-pressure system on the upstream side of the heat exchanger 5.SELECTED DRAWING: Figure 1 【課題】低圧系統に配置される熱交換器を、冷媒ガスの圧力変化に対し応答性高く且つ確実に保護することができる冷却装置を提供する。【解決手段】低圧系統から吸入される冷媒ガスを圧縮する圧縮機Ｃと、圧縮機Ｃにより圧縮され高圧系統に吐出される冷媒ガスを冷却する冷却器３と、冷却器３により冷却された冷媒ガスを膨張させる膨張機Ｅと、膨張機Ｅにより膨張され低圧系統に吐出される冷媒ガスで冷却対象物を冷却する熱交換器５と、を備えた冷却装置１であって、冷媒ガスが密閉される密閉容器６と、密閉容器６と低圧系統とを接続する低圧接続路６ｂと、低圧接続路６ｂを開閉する低圧開閉弁９と、を少なくとも備え、低圧接続路６ｂは、熱交換器５よりも上流側で低圧系統と接続されている。【選択図】図１