Vacuum freeze dryers are classified from the structure

Bell jar type freeze dryer: The freeze-drying chamber and the cold trap are separate upper and lower structures, and the freeze-drying chamber has no pre-freezing function. This type of freeze dryer requires manual operation when the material is transferred to the drying process after pre-freezing. Most of the experimental freeze dryers are of the bell jar type with simple structure and low cost. Most of the freeze-drying chambers use a transparent plexiglass cover, which is convenient for observing the freeze-drying of materials.

In-situ freeze-drying machine: The freeze-drying chamber and the cold trap are two independent chambers. The shelf in the freeze-drying chamber has a refrigeration function. After the material is placed in the freeze-drying chamber, the pre-freezing and drying process of the material does not require manual operation. . The production process of this type of freeze-drying machine is complicated and the manufacturing cost is high, but the in-situ freeze-drying machine is the development direction of the freeze-drying machine and is an ideal choice for the exploration of the freeze-drying process, especially for medicine, biological products and other special products. Freeze-dried.

a, ordinary type b, multi-manifold type c, gland type