Freezing drying machine

Abstract

This invention is about a kind of freeze-drying set, composing of case; freezing engine set vacuum pump and hot plate. The freezing engine set composes of compressor, heat exchanger, expansion valve and evaporator; the hot plate is set in front of the case, and the evaporator of the freezing engine set is set in rear of the case; there are louver interboards between the evaporator and hot plate, and fan in rear of the evaporator. The invention consumes less energy and be manipulated conveniently.

Description

Technical field [0001] The invention relates to a freeze dryer. Background technique [0002] Freeze-drying is to freeze the material containing a large amount of moisture in advance into a solid, and then directly sublime the moisture from the solid into a gaseous state under vacuum conditions, and separate it from the material. Under such production conditions, easily oxidized, volatile, and heat-sensitive substances can be preserved, and can inhibit the harmful effects of bacteria and enzymes, and can well retain the biological and chemical structure and activity of the product. Therefore, the color, aroma, taste, shape and nutritional content of the freeze-dried materials can be kept basically the same as the fresh products, and the rehydration is simple and fast, and can be basically restored into fresh products. The moisture content of the freeze-dried materials is below 3%, which is beneficial to Long-term storage of materials. [0003] The existing freeze dryers are divid...

AI Technical Summary

Problems solved by technology

[0003] The existing freeze dryers are divided into split freeze dryers and integrated freeze dryers. The split freeze dryers separate the three processes of pre-cooling, drying and water capture in production, which are completed by three independent devices. , this kind of freeze dryer has large volume, complex structure, cumbersome operation, and high energy consumption; the freezing, drying and cold trap of the integrated freeze dryer are placed in the same box, such as Chinese patent No. ZL94205313.3, named An all-in-one freeze dryer disclosed in the invention specification of "A Vacuum Freeze Dryer". The box has a cold plate assembly frame and a hot plate assembly frame. The material is first placed on the cold plate assembly frame for freezing, and the freezing is completed. Finally, the material is moved to the hot plate rack for heating, and the box is evacuated to sublimate the water in the material. At the same time, the cold plate rack continues to refrigerate, which acts as a cold trap to capture the sublimated water vapor

The disadvantages of this freeze dryer are: 1. The heat radiation of the hot plate assembly frame affects the cold plate assembly frame, and the energy consumption is relatively large

2. The frozen material must be moved from the cold plate rack to the hot plate rack, which is cumbersome to operate

3. The gap between the cold plate assembly frame is large. When used as a cold trap, the contact area between the water vapor and the cold plate assembly frame is small, and the water vapor cannot be fully captured.

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