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2023
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04
What is the maximum vacuum degree of a vacuum freeze dryer?
Vacuum freeze-drying machine is a technical method that freezes water containing items in advance, then sublimates their moisture in a vacuum state to obtain dry items.
Vacuum freeze-drying machine is a technical method that freezes water containing items in advance, then sublimates their moisture in a vacuum state to obtain dry items. Items that have undergone freeze-drying treatment are easy to preserve for a long time, and can be restored to their pre freeze-drying state and maintain their original biochemical characteristics after adding water.
The vacuum freeze-drying machine is composed of a refrigeration system, a vacuum system, a heating system, and an electrical instrument control system. The main components are drying oven, condenser, refrigeration unit, vacuum pump, heating/cooling device, etc. Vacuum freeze-drying technology has extensive applications in fields such as bioengineering, pharmaceutical industry, food industry, materials science, and deep processing of agricultural and sideline products, and its scale and field are still expanding.
The refrigeration system is an important component of freeze-drying machines, known as the "heart of freeze-drying machines". The refrigeration system mainly consists of the following components: compressor, refrigerant, oil separator, water condenser, drying filter, intercooler, sight glass, solenoid valve, hand valve (top cover valve), expansion valve, evaporator (plate type exchanger, rear box condensing coil), vapor liquid separator, return air filter, pressure gauge, pressure control relay, CPCE (energy regulator), safety valve, refrigeration pipeline, etc.
The control systems and functions of freeze-drying machines vary. For the experimental series of freeze-drying machines, they are mainly used for exploring the freeze-drying process of materials and conducting small-scale trial production. Therefore, the control system should be able to display the freeze-drying process parameters in real-time and automatically record them; Set, modify, and effectively execute freeze-drying process procedures; Equipped with communication interface for easy data collection and storage.
Extreme vacuum degree:
The ultimate vacuum degree reflects the leakage situation of the freeze-drying machine and the pumping efficiency of the vacuum pump. The vacuum degree of the freeze-drying box was previously believed to be better with a higher vacuum degree, but now the view is that the vacuum degree should be within a reasonable range. The vacuum degree is too high, which is not conducive to heat transfer, and the drying speed actually decreases. However, in any case, the no-load limit vacuum degree of the freeze-drying box should reach above 15Pa.
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