Plate type cold trap for freeze-dryer

Abstract

A plate type cold trap for a freeze dryer, characterized in that it includes a liquid supply main pipe (1), a liquid supply cross header (2), a liquid supply small header (3), a cold trap main board (4), a small reflux Header (5), return cross-header (6) and return main pipe (7); several cold trap main boards (4) are vertically arranged in parallel and equidistant or fan-shaped vertically, and the lower end of each cold trap main board (4) is Installed on the small liquid supply header (3), the lower end of each small liquid supply header (3) is installed on the liquid supply cross header (2), and the liquid supply main pipe (1) is installed on the liquid supply cross header The lower side of (2); the upper end of each cold trap main board (4) is equipped with a return small header (5); the upper end of each return small header (5) is installed on the return cross header (6) , the backflow main pipe (7) is installed on the upper side of the backflow cross-connection box (6); all have flow passages in the described each piece, and the flow passages at the joints of each piece are connected. The invention has the advantages of small size, low energy consumption, high water catch efficiency, and low manufacturing and operating costs.

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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