Freeze-dryer water-trapping system

Abstract

A freeze-drying device water-collecting system, its characteristics are: the prolonging section or lower or two sides of the drying warehouse (1) end away warehouse door (18) is divided by the baffle (2) as the cold-trap warehouse bodies (3) of the water collectors; the baffle (2) is equipped with venting window (16); or the cold-trap warehouse bodies (3) installed individually are connected with the drying warehouse (1); the cold-trap warehouse bodies (3) are equipped with many water collectors; the water collector (7) with minimum surface area is installed near the side of drying warehouse (1) in the cold-trap warehouse bodies (3) and the collector (8) with maximum surface area is installed near another side in cold-trap warehouse bodies (3); the water collectors with middle surface area are installed between the water collector (7) with minimum surface and the collector (8) with maximum surface area sequentially; the upper of rear closed head of drying warehouse (1) or cold-trap warehouse bodies (3) is equipped with vacuum valve (6) which is connected with the vacuum system. The invention can increase the production efficiency of freeze-drying machine, improve product quality, reduce energy consumption and simplify the structure of equipments.

Description

technical field [0001] The present invention relates to a vacuum freeze dryer (freeze dryer for short), especially a freeze dryer water catch system. Background technique [0002] Vacuum freeze-drying (also known as freeze-drying) is to first freeze the water-containing material below the eutectic point temperature, so that the free water in it becomes ice, and then, at an appropriate temperature and vacuum, the ice is sublimated (adsorbed water evaporates) In order for water vapor to escape from the material, a water trap is used to sublimate the water vapor to obtain a dry product. When the freeze dryer is working, the vacuum in the drying chamber is obtained by the vacuum system, which is mainly composed of a vacuum unit and a water catcher. During the drying process, a large amount of water vapor cannot be completely discharged out of the warehouse by the vacuum unit alone. The vacuum unit is only used to extract non-condensable gases. It must rely on cold traps to cond...

AI Technical Summary

Problems solved by technology

Although this kind of freeze dryer can realize two water catchers to catch water at the same time in the early stage of drying, a single water catcher can catch water separately and alternately defrost in the later stage of freeze drying, which overcomes the problem of single water catcher configuration due to the thick frost layer. The disadvantages are that there is no energy loss caused by cold and heat energy offset, and the drying chamber is easy to clean and disinfect. The flow resistance of water vapor from the drying chamber to the water catcher chamber is greatly increased. In order to achieve the same water catchment effect, the temperature of the water catcher must be lower, the power of the refrigeration compressor is higher, and the energy consumption of the refrigeration system is higher.

At the same time, affected by the structure, the freeze dryer with external double water traps takes up more space and has high manufacturing costs

[0011] In the drying process of the existing double water catcher freeze dryer, a large amount of additional energy is consumed due to multiple defrosting (the defrosting requires hot steam, and the water catcher needs to cool down after heating up to consume cooling), and the water catcher vacuum The valve is large and the structure is complicated, which increases the manufacturing cost

[0012] The existing single water catcher and double water catcher freeze dryers all use the same large water catcher and refrigeration system that can meet the maximum desublimation capacity. On the one hand, it is difficult to achieve the corresponding energy, temperature regulation and high energy efficiency ratio of the refrigeration system configured according to the maximum desublimation. ) to meet the small water catch requirements for a long time, which is equivalent to a large horse-drawn cart, which will inevitably cause a waste of energy

Images