Introduction:
    Yu Jiang cold ventilator is divided into DL type (preservative), DD (cold keeping), DJ (refrigeration), using various heat exchange copper tube imported from Germany, Japan and domestically produced,  the heat exchanger copper tubes of high efficiency are internally threaded and the wind guide wing is made of water permeable corrosion- resistant thin aluminum foils in parallel vein pairs, that expand the mechanical tube to tightly link the copper tubes and aluminum pieces together in order to maximize heat transfer efficiency, compact structure, small volume, light weight, high efficiency of heat exchange, easy cleaning and maintenance, combined with effective uranium ventilator to increase the wind quantity, wind area, wind blowing speed, reduce noise, make uniform temperature in cold storage, quickly achieve high efficiency of preservation, cold keeping, freezing, high speed freezing speed.