The four-ring lyophilization experimental lyophilizer is correctly configured with filters

Four-ring lyophilization experimental lyophilizer is a device that realizes cold drying technology, which is a relatively complex structure of the machine, which involves refrigeration, vacuum, thermal engineering, machinery, fluid, electrical control and pressure vessel and other fields of knowledge
.

The equipment has the characteristics of small size, light weight, many functions, stable performance, high system accuracy, and multi-purpose of one machine, and can adapt to the experiment
of a variety of materials.

The refrigeration system of the lyophilizer belongs to compression refrigeration, which is composed of
four basic components such as refrigeration compressor, condenser, evaporator and expansion valve.

They are connected with pipes to form a closed system in which refrigerant circulates continuously, changes in state and exchanges
heat with compressed air and cooling media.

The compressed air from the gas source contains a large amount of liquid water, solid dust of different particle sizes, oil pollution, oil vapor, etc
.

If these impurities are allowed to enter the lyophilizer directly, it will worsen
the working condition of the lyophilizer.

For example, oil pollution will contaminate the heat exchange copper pipe in the precooler and evaporator, affecting heat exchange; Liquid water increases the workload of the lyophilizer, and solid impurities easily clog drainage holes
.

Therefore, it is generally required to install a pre-filter upstream of the air intake of the lyophilizer for impurity filtration and oil-water separation to avoid the occurrence
of the above situation.

The filtration accuracy of the pre-filter for solid impurities is not very high, generally 10 ~ 25μ can be, but the separation efficiency of liquid water and oil pollution is higher
.

Whether the rear filter of the four-ring lyophilization experimental lyophilizer is installed should be determined
by the user's quality requirements for compressed air.

For general power gas, it is equipped
with a main pipe filter with high precision.

When the gas requirements are higher, the corresponding oil mist filter or activated carbon filter should be configured
.