Vacuum freeze dryer

Abstract

The invention provides a vacuum freeze dryer comprising a drying and freezing box, at least two cold trap cabins, a refrigeration system, a vacuum system, an ice melting system and a control system. The refrigeration system is connected with the cold trap cabins and is used for freezing materials in the drying and freezing box; the vacuum system is used for maintaining the vacuum degree in the drying and freezing box; the ice melting system is used for melting frost frozen in the cold trap cabins; the control system is electrically connected to the ice melting system, the vacuum system and therefrigeration system and is used for controlling starting or stopping of the ice melting system, the vacuum system or the refrigeration system; in the production process, the control system controlsthe ice melting system and the refrigeration system, so that one cold trap cabin performs cold trap water catching operation, the other cold trap cabin performs low-pressure steam ice melting operation under the vacuum state, and alternative switching is carried out. The vacuum freeze dryer overcomes the defect that cold trap cabins of an existing vacuum freeze dryer need to firstly carry out coldtrap water catching and then perform low-pressure steam ice melting under the vacuum state after ending of freezing, and consequently long time is wasted.

Description

technical field [0001] The invention relates to the technical field of dryers, in particular to a vacuum freeze dryer. Background technique [0002] Conventional drying can cause the material to shrink and destroy cells. Freeze-drying, on the other hand, refers to the process of removing water or other solvents from frozen biological products by sublimation. Sublimation refers to the process in which a solvent, such as water, changes directly from a solid state to a gaseous state, like dry ice, without going through a liquid state. The product obtained by freeze-drying is called a lyophilizer, and the process is called freeze-drying. The structure of the sample is not destroyed during the freeze-drying process because the solid components are supported by the solid ice in their place. As the ice sublimates, it leaves pores in the dry residue. This preserves the integrity of the product's biological and chemical structure and its activity. In the laboratory, freeze-dryin...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a vacuum freeze dryer, which solves the problem that the cold trap cabin of the existing vacuum freeze dryer needs to catch water in the cold trap first, and then melt the ice with low-pressure steam in a vacuum state after the freezing is completed, which consumes a lot of energy. long-term defects

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