AIR REFRIGERANT TYPE REFRIGERATING APPARATUS AND DEFROSTING METHOD FOR THE SAME

PROBLEM TO BE SOLVED: To provide an air refrigerant type refrigerating apparatus capable of shortening stop time of the apparatus by reducing an amount of water accumulating in a cold recovering heat exchanger, and a defrosting method for the same.SOLUTION: An air refrigerant type refrigerating apparatus 1 includes a compressor 11, a primary cooler 20, a cold recovering heat exchanger 30, a defrost device 40, and an expander 13. The cold recovering heat exchanger has a low pressure side flow passage 33 through which air fed from a cooled chamber 60 flows, and a high pressure side flow passage 31 through which air fed from the primary cooler flows. The air refrigerant type refrigerating apparatus further includes a first circulation flow passage 78 branched from a first flow passage 71 connecting the primary cooler and the high pressure side flow passage of the cold recovering heat exchanger and forming a circulation passage together with the high pressure side flow passage, a second circulation flow passage 80 branched from a third flow passage 73 connecting the cooled chamber and the low pressure side flow passage of the cold recovering heat exchanger and forming a circulation passage together with the low pressure side flow passage, and a heated air feeding section 50 for heating the air in the first circulation flow passage and the second circulation flow passage and feeding the heated air into the first circulation flow passage and the high pressure side flow passage and into the second circulation flow passage and the low pressure side flow passage. 【課題】冷熱回収熱交換器に溜まる水の量を低減して装置の停止時間を短縮可能な空気冷媒式冷凍装置及びそのデフロスト方法を提供する。【解決手段】空気冷媒式冷凍装置１は、圧縮機１１と一次冷却器２０と冷熱回収熱交換器３０と霜除去器４０と膨張機１３を備える。冷熱回収熱交換器は、被冷却室６０から送出される空気が流れる低圧側流路３３と、一次冷却器から送出される空気が流れる高圧側流路３１を有する。一次冷却器と冷熱回収熱交換器の高圧側流路とを繋ぐ第１流路７１から分岐して高圧側流路ともに循環路を形成する第１循環流路７８と、被冷却室と冷熱回収熱交換器の低圧側流路を繋ぐ第３流路７３から分岐して低圧側流路ともに循環路を形成する第２循環流路８０と、第１循環流路及び第２循環流路内の空気を加熱し、加熱された空気を、第１循環流路と高圧側流路内、及び第２循環流路と低圧側流路内に送出するための加熱空気送出部５０とが設けられる。【選択図】図１