Explain the working principle of the lower freeze dryer

Freeze dryer is also known as freeze dryer. Freeze dryer is a kind of equipment which freezes the water containing material into solid state first, then sublimates the water from solid state to gas state, so as to remove water and keep the material. Freeze dryer is also known as freeze dryer. Freeze dryer is a kind of equipment which freezes the water containing material into solid state first, then sublimates the water from solid state to gas state, so as to remove water and keep the material.

Freeze dryer is composed of refrigeration system, vacuum system, heating system and electrical instrument control system. The main components are drying box, condenser, refrigeration unit, vacuum pump, heating / cooling installation, etc. freezing and drying editing is a technology to stop boring by applying the principle of sublimation, which is to quickly freeze the dry materials at low temperature and then in the appropriate vacuum environment.

The process of directly sublimating frozen water molecules into water vapor escaping. The product of freezing and drying is called lyophilized. The process is called freeze drying, and the material is always in low temperature (frozen state) before drying. At the same time, ice crystals are dispersed in the substance. The sublimation process does not cause condensation due to dehydration, and prevents the reaction of bubbles and oxygenation caused by water vapor.

The dry substance is porous and has no change in volume. It is easy to dissolve in water. To avoid the physical and chemical and biological denaturation of dry materials on a large scale. The working principle of the editor's freezing dryer is to freeze the dry objects below the three-phase temperature, and then sublimate the solid water (ice) in the articles into steam directly under the vacuum condition, and then sweep away the articles to make them dry.

After pre disposal, the materials are sent to the quick freezing bin for freezing, and then sent to the drying bin for sublimation and dehydration, and then packaged in the post disposal workshop. The vacuum system establishes a low pressure condition for the sublimation drying chamber, the heating system provides sublimation latent heat to the materials, and the refrigeration system provides the cooling capacity required for the cold well and the drying chamber. The equipment adopts high-efficiency radiation heating, material heating average; high-efficiency water-cooling trap, and can complete rapid defrosting.