Semiconductor refrigeration vacuum freezing dryer capable of realizing energy recovery

Abstract

The invention relates to a semiconductor refrigeration vacuum freezing dryer capable of realizing energy recovery. The semiconductor refrigeration vacuum freezing dryer capable of realizing energy recovery comprises an annular side wall, a temperature equalizing plate, a semiconductor refrigerator, a water catcher, a water-cooling radiator, a material chamber, a vacuum chamber, a vacuum meter, a thermostat, a controllable power supply, a vacuum pump and a valve. By adopting a semiconductor refrigerating / heating mode and according to the characteristic of energy consumption in the freeze-drying process, heat released from the freezing process is used for defrosting / deicing and heat released from the condensation process is used as heat of sublimation. The semiconductor refrigeration vacuum freezing dryer capable of realizing energy recovery has the advantages of saving energy by over 30 percent through energy recovery and complementation at different stages, saving freeze-drying time by over 20 percent, effectively improving drying capacity, expanding application and having advantages when applied in the fields of experiments, process research, underbrush and the like, along with simple and compact system, flexibility, convenience, wide temperature controlling range and rapid response.

Description

technical field [0001] The invention relates to a semiconductor refrigeration vacuum freeze dryer, in particular to a semiconductor refrigeration / heating vacuum freeze dryer capable of energy recovery and complementation. Background technique [0002] The freeze-drying process (freeze-drying process) has a decisive influence on the quality of the freeze-dried product. Generally, to develop new freeze-dried products, first use small-scale freeze-drying machines to explore the process, and then extend to large-scale production freeze-drying machines for calibration and use, which is quick and convenient and reduces waste. Therefore, the development of a small multifunctional freeze dryer with strong adaptability and a wide range of working conditions is very important. Existing freeze dryers generally use vapor compression refrigerators and liquid nitrogen. The former has a complex structure and poor flexibility, and it is difficult to realize complex heating and cooling proc...

AI Technical Summary

Problems solved by technology

The technical solutions of the above-mentioned documents have the following defects: ① only use the exhaust heat of the refrigeration compressor to provide the sublimation stage, and do not perform energy complementarity between the pre-freezing stage and the defrosting / icing stage; ② the index given is an ideal value, and the actual The effect depends on the amount of sublimation and the parameters of the drying process. Considering the complex changes in the process parameters, the exhaust heat of the refrigeration compressor does not match the heat of sublimation. The system still needs to be close to the full-load condensing capacity, and an auxiliary heating system needs to be added. Comprehensive consideration of technical and economic indicators may still outweigh the gains; ③The switching speed between mechanical refrigeration and heating is slow, resulting in thermal shock and large heat loss; ④The system is based on vapor compression refrigeration, with complex structure and high control requirements

In addition, the patent (Zhang Shuxiu, energy-saving fast vacuum freeze dryer, CN 245754IY) utilizes a slidable material tray that can be placed separately on the condensation plate and the heating plate for material freezing and heating. Condensation does not achieve real energy complementation and recovery

[0004] Patent (Cai Daixi, etc., Semiconductor Vacuum Freeze Dryer, CN87209124) proposes a metal-semiconductor galvanic pair refrigeration stack vacuum freeze dryer, patent (Liu Jing, Zhou Yixin, Miniature Vacuum Freeze Dryer Using Semiconductor Refrigeration, ZL01229970 .7) For the application of cryobiology, a freeze dryer with similar principles was proposed, but the technical solution of the above patent only uses semiconductor refrigeration to replace conventional refrigeration to realize cooling and heating of materials

However, the heat released during cooling and the heat absorbed during heating are not used, and additional energy is consumed for cooling and heating, which consumes a lot of energy.

In addition, there is no water catcher structure. The water catcher is an important part to ensure that the sublimated water vapor has sufficient diffusion power and prevent water vapor from entering the vacuum pump. Therefore, the technical solution proposed by the above patent has defects and its application is limited.

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