Vacuum freeze dryer Vacuum freeze dryer is a device that converts liquid or semi-solid substances into dry products through freezing and vacuum drying technology. 1. Principle of vacuum freeze dryer The drying principle of the vacuum freeze dryer is to evaporate liquid or semi-solid substances in a frozen state through a drying process in a vacuum state, and transform the substances into dry products. This process mainly involves three key factors: freezing, vacuum, and heating. Among them, the purpose of freezing is to freeze the substance to a low temperature state; the purpose of vacuum is to extract the air around the substance to create a vacuum state; the purpose of heating is to heat the substance through a heater to evaporate the water. 2. Structure of vacuum freeze dryer The vacuum freeze-drying machine is mainly composed of cooling system, vacuum system, heating system, temperature control system, electrical control system and other parts. Among them, the cooling system mainly consists of refrigerators, condensers and other parts to freeze the material; the vacuum system mainly consists of vacuum pumps, adsorption tanks and other parts to extract the air around the material; the heating system mainly consists of heaters, heating plates and other parts , to heat up the material; the temperature control system monitors and controls the temperature of the material through a temperature sensor; the electrical control system regulates and controls each part through the controller.3. Application of vacuum freeze dryer Vacuum freeze dryers are widely used in food, biological products, pharmaceuticals, chemical and other industries. In the food industry, vacuum freeze dryers are used to make various dried fruits, vegetables, meats and other dried foods, as well as coffee, tea and other beverages. In the biological products industry, vacuum freeze dryers are used to produce various enzymes, antibodies, vaccines and other biological products. In the pharmaceutical industry, vacuum freeze-drying machines are used to produce various medicines, vaccines, etc. In the chemical industry, vacuum freeze dryers are used to produce various chemical raw materials, additives, etc. 4. Future Development Trend of Vacuum Freeze Dryer With the advancement of science and technology, vacuum freeze dryers are also constantly developing and improving. In the future, vacuum freeze-drying machines will be more intelligent and automated, and will also receive greater improvements in energy utilization, drying efficiency and other aspects. At the same time, the application of vacuum freeze-drying machines in medicine, agriculture, environmental protection and other fields will also be more widely expanded.