Drum-type vacuum freeze-drying machine

Abstract

The invention relates to a drum-type vacuum cooling dryer which comprises a circular drying drum, a heat insulation layer, an electric heater, a refrigerating unit, a cold trap and a vacuum pump. One end of the drum is provided with a drying-drum transmission shaft while the other end is provided with a sealing door; the end of the drying drum with the sealing door supports against a rotatable roller of the drying drum; a vacuumizing port communicating with the inside of the drying drum is arranged inside the drying-drum transmission shaft, and the tail end of the drying-drum transmission shaft is provided with a movable vacuum sealing assembly communicating with the vacuumizing port; a movable vacuum sealing element is arranged in the movable vacuum sealing assembly; the heat insulation layer wraps around the drying drum and is not in contact with the drying drum; the electric heater is arranged between the heat insulation layer and the drying drum; and the refrigerating unit, the cold trap and the vacuum pump are mutually connected by vacuum pipes. The drum-type vacuum cooling dryer has high drying speed, uniform drying and low drying cost.

Description

technical field [0001] The invention relates to a vacuum freeze dryer, in particular to a drum type vacuum freeze dryer. Background technique [0002] The existing vacuum freeze dryer puts the material into the material tray when drying the material, then puts the material tray into the multi-layer material rack, and then pushes the multi-layer material rack into the gap in the multi-layer heating plate layer, The heat required for sublimation is transferred to the materials on the inner surface of the gap through radiation or convection, and then transferred to the inner and bottom materials through the surface materials. [0003] During the whole drying process, the material is always in a static state. Because the material in the material tray has a certain thickness, there is a certain degree of covering between the material and the adjacent material, so the heating of the covered material is not uniform, and the material on the surface is always dried first, and then t...

AI Technical Summary

Problems solved by technology

Because the material in the material tray has a certain thickness, there is a certain degree of covering between the material and the adjacent material, so the heating of the covered material is not uniform, and the material on the surface is always dried first, and then the inner layer or bottom layer The material is dry, so the drying cycle of the static material is generally more than 12 hours, which leads to low drying efficiency of the material

Images