Vacuum Pump in Vacuum Drying Equipment

Vacuum drying equipment: Vacuum dryer consists of three parts: drying cabinet, condenser and condensate collector, condensation system and vacuum pump. The wet material is placed in shallow dish and placed on the shelf of the drying cabinet. The heating steam is introduced by the vapor population. It passes through the sandwich shelf. The condensate water flows out from the lower outlet of the drying box through the condensate tube to the condensate collector. The condensation system is closely connected with the valve and the vacuum pump through the pipeline to form a complete closed system, so that the drying operation can be carried out continuously.

Vacuum pumps are the key equipment in the selection of vacuum drying equipment in various industries. Different materials can choose different vacuum pumps. Many people confuse vacuum drying with vacuum oven, thinking that they can achieve the effect of drying. In fact, vacuum drying is different from oven.

Vacuum dryer: Using the principle of reducing boiling point of vacuum water, drying materials by conduction heating.

Oven: The drying effect can be achieved by convection and conduction heating through the circulation of hot air.

For some materials, both types of equipment can be dried. But for some materials, vacuum dryer or oven can only be used.

Such as: thermal sensitive materials, or solvent recovery, the choice of vacuum dryer.

Vacuum freeze-drying is based on sublimation principle. Material is frozen rapidly at low temperature and then discharged directly from solid to gaseous in vacuum. All the processes are completed in the machine at one time. So freezing and then putting into the oven can not replace vacuum freeze-drying.

Different materials have different guaranteed temperature, so the design of vacuum system is different. It is better to inform the professional vacuum pump manufacturer of the conditions you require.

The main characteristics of vacuum drying are as follows:

(1) Vacuum drying is suitable for heat-sensitive materials, oxidizable materials at high temperature, or materials with valuable or toxic or combustible exhaust gas.

(2) The vacuum and heating temperature range used in the drying process is large, and the versatility is good.

(3) Low drying temperature, no overheating, easy evaporation of water, short drying time.

Vacuum drying characteristics:

The process of vacuum drying chamber is to place the drying materials in a sealed drying chamber and heat the drying materials continuously while vacuuming them with a vacuum system, so that the moisture in the materials can diffuse to the surface through pressure difference or concentration difference. The water molecules can obtain enough kinetic energy on the surface of the materials and escape to the low-pressure space of the vacuum chamber after overcoming the mutual attraction of the molecules. Vacuum pump pumping process.

In the vacuum drying process, the pressure in the drying chamber is always lower than the atmospheric pressure, the number of gas molecules is small, the density is low, the oxygen content is low, so it can dry materials which are easy to oxidize and deteriorate, inflammable and explosive dangerous goods, etc. It can play a certain role in disinfection and sterilization of drugs, food and biological products. It can reduce the chance of material contamination or inhibit the growth of some bacteria.

It is predicted that with the development of vacuum pump technology, the proportion of China’s export vacuum dryer equipment in total output will increase from 5% to 10% in the next few years, and the export market will also expand to Europe and the United States. Gradually shorten the gap between domestic large-scale vacuum dryer equipment manufacturing and international level. The progress of vacuum dryer technology will reverse the current export situation of domestic drying equipment.

SV Rotary Vane Vacuum Pump