Overview of the structural characteristics of vacuum freeze dryer

The basic principle of freeze drying is based on the three-state change of water. Water has solid, liquid and gaseous states, and the three states can be converted and coexist. The moisture in the pre-frozen material is directly removed by ice sublimation into water vapor without being melted by ice, thereby achieving the purpose of freeze-drying.

    The lyophilized product has a sponge shape, no shrinkage, excellent rehydration, and very little water content. After storage, it can be stored and transported at room temperature for a long time. Since vacuum freeze-drying has unparalleled advantages in other drying methods, it has become more and more popular since its inception, and has become increasingly popular in medicine, biological products and food.

    The energy required for the cooling and opening of the food is transmitted to the shelf through the heat exchange medium and then to the food. The shelf is made of special hollow splint, which has high strength and good sealing. The shelf assembly is installed in the freeze-drying box through the bracket, and a plate layer is set as the heat radiation compensation plate on the uppermost layer to ensure that the space of the food in the box is in the same temperature environment, and the sides and the back of the shelf are both Set the rails to prevent the food tray or food from coming off the shelf.

    The cylinder automatic locking device is adopted. Ensure the degree of vacuum required during the internal pressure of the cabinet. When the vacuum pump is working, the thousand-box butterfly room is opened, and the air and water vapor in the vacuum drying chamber are taken up by the water catcher to enter the vacuum pump, and the vacuum pump exhaust port is discharged from the system, and the oil mist trap is installed at the exhaust port of the vacuum pump. To prevent the smoke in the exhaust gas from polluting the indoor environment. In order to prevent water vapor from entering the pump, the system is equipped with a gas ballast valve, and the gas ballast valve is opened during the drying process.