Cabinet of tea vacuum freeze dryer

Abstract

The invention discloses a case of a tea vacuum refrigeration dryer machine, which comprises a drying case body, irradiation heating plate components, cold trapping components, a sealing door, twice heating medium inlet and outlet pipes, refrigerant inlet and outlet pipes, a vacuum pumping pipe and a water discharging pipe. The section of the drying case in radial direction is round. The case also comprises a supporting frame fixed on the inner wall of the drying case body; the irradiation heating plate components are horizontally arranged in the middle of the drying case body in axial direction through the supporting frame. The cold trapping components are positioned in an arc space formed by the outer side of the supporting frame and the internal wall of the drying case body, and are fixed on the arc inner wall of the drying case body. By adopting the structure, the utilization rate of the space in the drying machine is greatly improved; the materials used in production are decreased and production cost is reduced. What is more important is that the tea vacuum refrigeration drying machine is easy to operate, suitable for the characteristic of low water containing of prefabricated tea in tea drying industry and can greatly reduce operation cost of equipment.

Description

technical field [0001] The invention relates to a vacuum freeze-drying device, in particular to a vacuum freeze-dryer for tea drying. Background technique [0002] Existing tea dryers are almost all heat drying machines. Since the heat drying machine dries tea leaves under normal pressure and high temperature (60-90°C), the tea leaves are heated in the hot air, and part of the organic matter in the tea leaves is heated. Oxidation continues to occur under high temperature, consuming part of nutrients; chlorophyll is also decomposed and destroyed at high temperature, resulting in darker tea color; part of the original aroma substances in tea leaves are also dispersed with hot wind. When the vacuum freeze-drying technology is drying the tea, the temperature of the tea is always kept below -16°C. Due to the low temperature of the tea, the chlorophyll hardly changes, and the color is green and durable. There is almost no loss of material, drying evenly, and the water content can...

AI Technical Summary

Problems solved by technology

[0003] Generally speaking, when tea leaves are collected to be dried, their water content is below 30%, while traditional vacuum freeze dryers are designed for tea leaves with a water content of about 90%, which makes traditional vacuum freeze drying The design of the machine is complex, the structure is huge, and the energy consumption is high

Therefore, the majority of tea farmers and tea producers cannot afford the high equipment investment and operating costs. Therefore, this type of traditional vacuum freeze dryer can only be used as research equipment in the laboratory, and cannot be widely used.

[0004] There are three main types of drying ovens and radial cross-sectional shapes of existing vacuum freeze-drying devices: one is circular. Generally, people think that circular drying ovens are easier to manufacture and have less consumables. Generally, people think that the disadvantage is that there are more spaces that cannot be used. , especially on both sides, the second is square, the manufacture of a square drying box is relatively difficult, but there are many consumables, and the advantage is that the space is fully utilized. The third is the bell shape, which is more difficult to manufacture than a square drying box. The current application has been rarely used in

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