Plate type cold trap for freeze-dryer

Abstract

A plate type cold trap for a freeze dryer, characterized in that it includes a liquid separation pipe (1), a liquid separation joint (2), a liquid separation small header (3), a cold trap main board (4), and a throttle plate (17) , return air small header (5), return air cross header (6) and return air main pipe (7); several cold trap main boards (4) are arranged in parallel equidistant or fan-shaped arrangement, each cold trap main board (4) The upper end is equipped with a small liquid header (3); each small liquid header (3) is equipped with a liquid pipe joint (2); the other end of the liquid pipe joint (2) is connected to the liquid pipe ( 1) Connection; the lower end of each cold trap main board (4) is equipped with a small return air header (5); the lower end of each small return air header (5) is installed on the return air cross header (6) , the return air main pipe (7) is also contained on the return air cross header (6). The invention has the advantages of small volume, low energy consumption, high water-catching efficiency, easy defrosting, low manufacturing cost, and can realize the direct expansion liquid supply of the cold trap of the freeze dryer.

Description

technical field [0001] The invention relates to a vacuum freeze dryer (hereinafter referred to as a freeze dryer), in particular to a plate cold trap for a freeze dryer. Background technique [0002] Freeze-drying technology is to freeze the water-containing material to the temperature below the eutectic point, so that the water in it becomes ice, and then sublimates the ice into water vapor to escape from the material at an appropriate temperature and vacuum, and uses a cold trap to freeze the Water vapor desublimation, so as to obtain the technology of drying products. When the freeze dryer is working, the vacuum in the freeze-drying chamber is obtained by the vacuum system, which is mainly composed of a vacuum unit and a cold trap. During the drying process, a large amount of sublimated water vapor cannot be completely discharged out of the warehouse by the vacuum unit alone. The vacuum machine is only used to extract non-condensable gas. For the water vapor in the gas, ...

AI Technical Summary

Problems solved by technology

[0003] The cold traps (built-in type and external built-in type) of the existing freeze dryers mostly adopt the tube structure of copper tube, galvanized steel tube or stainless steel tube, which are divided into coil type (spiral tube, serpentine tube) and column tube type. Due to the limitation of the tube structure and layout, the tube type cold trap not only occupies a large space, but also has a long process flow and large flow resistance, which is not conducive to the evaporation of the working fluid or the heat exchange of the refrigerant, and there are a large number of uneven surface temperatures. On the leeward side, the effective heat exchange area is not fully utilized, the flow resistance of water vapor is large, and ice blockage is easy to occur on the windward side, so the water capture efficiency of the tubular cold trap is very low and the energy consumption is also large

[0004] There is a plate type cold trap on the small freeze dryer, which is formed by embedding a coil in a flat material (mostly aluminum), which is actually a modified tube type cold trap, which also has some shortcomings of the tube type cold trap , due to the small power per unit surface area, it is not suitable for large freeze dryers

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