Vacuum freeze-drying machine

Abstract

The invention relates to a vacuum freeze drier which comprises a freeze drying bin, a water catcher, a vacuum pump, a refrigeration compressor set consisting of a condensate storage tank, an oil separator and a double-stage type compressor, and a freezing evaporator arranged inside the freeze drying bin. As the vacuum freeze drier fully utilizes cold source and hot source of the refrigeration compressor set to cool and heat materials, the technical proposal has high utilization efficiency of energy and a reasonable structure, greatly improves the service life and use effect of the vacuum pump and the refrigeration compressor set in order that the power of the whole drier can be reduced by two thirds and the electricity consumption in the process of equipment operation is reduced by one half.

Description

technical field [0001] The invention relates to a drying device, in particular to a vacuum freeze dryer. Background technique [0002] In the process of freeze-drying, the quick-frozen material does not need to be melted by ice, but is directly sublimated from a solid state into water vapor to dehydrate it, thus maintaining the color, fragrance, nutritional components and appearance of the original fresh food to the greatest extent, and reproducing The water property is excellent, and it can be restored within a few seconds to a few minutes. Its color, taste, and shape are basically the same as the fresh product; due to thorough dehydration, the product can be stored at room temperature for more than 5 years without adding any preservatives, and the weight of the finished product Light, easy to carry and transport, has been recognized by consumers. On December 19, 2006, the China Intellectual Property Office applied for a patent titled "Vacuum Freeze-Drying Integrated Machi...

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Problems solved by technology

But find according to the research of the present inventor, there is following defect in this technical scheme and needs to improve; The water vapor in the dry chamber enters the condensate chamber from bottom to top, and the journey of the water vapor is very short. At this time, the temperature difference between the upper and lower refrigeration pipes of the condenser will be large, and the water capture effect will be poor. In serious cases, it will directly affect the vacuum pump. Normal operation also causes the equipment to be too high, which is inconvenient for transportation and maintenance; 2. The original heater does not function in the cooling stage, but in the heating stage of the vacuum freeze-drying machine, the high-pressure exhaust of the compressor unit and The temperature difference of the low-pressure exhaust is only less than 30°C, and the heating effect is poor; 3. The overall structure is relatively complicated, and the use effect is not ideal

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