Vacuum dryer, belonging to a transmission type drying and upcoming condenser, vacuum pump and conduction type dryer supporting form vacuum dryer. The vacuum dryer has low drying temperature, drying rate, energy saving, anti pollution equipment closed features. Most of the conductive dryer can be designed into vacuum dryer. Vacuum dryer in biological products, medicines, drinks and heat sensitive materials, oxygen sensitive material, solvent recovery, and so dry until the unique role.

With the continuous development of industrial technology, the majority of the closed and close to the closed type of ambient pressure drying equipment is designed into a vacuum dryer. A wide variety of different structure. The classification method is not the same.
According to the operation mode classification, divided into intermittent and continuous; classification according to the state of the materials in the drying process, divided into static type. Turning type, stirring type and vibration type; according to the drying mechanism, can be divided into evaporation and sublimation. Because of the vacuum dryer with lower temperature get higher drying rate, in the low temperature drying heat sensitive material can also be dry oxygen sensitive material or combustion hazard of materials for organic solvent or toxic gases material contained in a dry. Solvent can be easily recovered, the drying into very low moisture, and can be used with low moisture content of materials further drying, vacuum drying technology has been developed greatly. Thus becoming one of the main types of drying equipment.

There are about twenty kinds of vacuum drying machine used in industry. Although vacuum dryer has a variety of forms, but there are two points in common law, one is the vacuum drying is dominated by heat conduction, mostly dry was no air solid separation system. Two most of the drying machine is equipped with heating jacket, the structure design and processing quality requirements are very high. In addition, vacuum drying process for the high value-added materials.