The vacuum freeze dryer is designed for the transformation and upgrading of the existing conventional vacuum drying and oven, which is mainly composed of refrigeration system and vacuum system. The working principle of the vacuum freeze-drying machine is to freeze the wet material to the eutectic point temperature to make the water in the material become solid ice. Then, in a higher vacuum environment, the ice is directly sublimated into water vapor by heating the material, and then the water vapor is condensed by the water vapor condenser in the vacuum system, so as to achieve the purpose of dehydration and drying. The vacuum freeze-drying machine has the advantages of fast drying speed, 3-10 times shorter drying time and low energy consumption, which is only 20% - 30% of the energy consumption of ordinary dryers. It can carry out rapid drying, and there is no oxygen in the vacuum drying chamber. The drying quality is comparable to the quality of original ecological fresh materials. It can recover organic solvents, which is conducive to reducing production costs and environmental protection,

It is especially suitable for materials containing organic solvent that can not be dried by ordinary dryers. The vertical open door structure can realize in-situ freeze-drying of materials. The control system takes PLC as the core and uses touch screen as man-machine interface to record multi-channel temperature data in the process of freeze-drying in real time and browse in the form of curve. The man-machine interface is clear and intuitive, and the shelf temperature control curve can be preset, The host computer has USB interface, which can upload the freeze-dried data to the computer in real time and realize the functions of saving, browsing and printing,

It can reduce the possibility of the material being oxidized and deteriorated, eliminate the bacteria in the material and ensure the quality; At the same time, the original shape of the material can be well preserved. The vacuum freeze dryer is a process of drying the material in low temperature and vacuum state, and largely maintains the color, aroma, taste, shape and nutritional components of the dried material. The vacuum freeze-drying machine can be used for drying fruits and vegetables, meat and poultry, aquatic products, condiments, convenience foods and famous specialty products. It can maintain the original color, aroma, taste, shape and freshness of food, and has good rehydration. The finished products are easy to store and transport, and the cost is reduced, The preservation period was extended.