Medical freeze dryer is composed of refrigeration system, vacuum system, heating system, electrical instrument control system. The main components are drying box, condenser, refrigeration unit, vacuum pump heating / cooling device, etc.
The product is lyophilized in a drying box. The shelf inside the drying box is made of stainless steel. There are media ducts in it to cool or heat the product. A vacuum sensor is installed at the back of the drying box. It is transformed into a telecommunication signal. A sealing rubber ring is inlaid around the door of the box. Vacuum silicone grease can be applied to ensure the sealing of the box before use.
The condenser is best to be wound cylindrical, with several sets of air-conditioning coils wound around the stainless steel cylinder. Its working temperature is lower than the temperature of the product in the drying box, and the lowest can be -550C. The water vapor sublimated from the product can be sufficient. The ground is condensed on the inner surface of the stainless steel cylinder that is in contact with the cold coil, so that the lyophilization process can be carried out smoothly. The biggest advantage of the smooth cylindrical structure is that it is easy to clean. The layer was removed.
Rotary vane vacuum pump is used to evacuate the system. An electromagnetic vacuum valve with automatic venting is installed at the inlet of the mechanical pump. It is controlled by the same power source as the rotary vane pump. When the pump is stopped, the electromagnetic valve is automatically closed. At the same time, the air is vented into the vacuum pump, which not only protects the vacuum system, but also prevents the vacuum pump from returning oil to the system.
In the refrigeration system, two 2.2Kw semi-closed refrigerators are used in parallel. The high-pressure refrigerant liquid (fluorine-free refrigerant V55C) from the air condenser passes through the drying filter and solenoid valve to reach the capillary tube, and then enters after throttling. In the evaporator, due to the suction effect of the freezer, the pressure in the evaporator decreases, and the liquid refrigerant absorbs the heat of the environment and rapidly boils and evaporates. The low-pressure refrigerant gas is drawn back by refrigeration, and then compressed into high-pressure gas to complete a refrigeration cycle. The cold exhaust pipe in the heating / cooling device is cooled by the cold exhaust pipe in the condenser and the cold air coil in the condenser. Medium evaporation, they are supplied by two different solenoid valves.
The heating system consists of an electric heating pipe, a medium (silicone oil), a media pump, a media box, etc., and the silicone oil is heated by the electric heating pipe and then sent by the media pump to the media conduit in the dry box shelf to heat the product. Provides sublimation heat. When frozen, the silicone oil is cooled by the cooling pipe, and is transported by the media pump to the media duct in the center of the shelf of the drying box to cool and freeze the product.
The freezer dryer electrical instrument control system is designed for mechatronics and is controlled by a dedicated industrial control motor. All shelf temperature, media temperature and product temperature can be displayed on a centralized display.
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