ZLG - 0.4 Experimental Design of the Lyophilizer Abstract Vacuum freeze-drying is a kind of dry method,which is to freeze the object below the eutectic point temperature ,then pass the sublimation to obviate the moisture from the object under the condition of higher vacuum.With the development of refrigeration,vacuum,biology,electronics,etc.,now vacuum freeze-drying equipments have already applied to the realms extensively,such as medical science,biology,pharmacy and agriculture,etc,so far they still apply to the molecular biology, genetic engineering, new biomedical science,new type Chinese herbal medicine,high-quality convenient food, archeology and the powder material manufacturing etc.Researches on the function of vacuum freeze-drying equipment have already caused the extensive interest and value. This article describes the ZLG-0.4-type test with vacuum freeze-drying machine works,structural features,design calculations.ZLG-0.4-scale freeze-dried unity. This machine has a heating and cooling function.The material to dry.It consists of oven,condensation (water catching),heating system,vacuum system,cooling system and electrical control system composed of six parts.The primary components of the oven, condensation (water catching),vacuum and cooling systems.The freeze-dried box set the frame of the workpiece,the workpiece rack has a shelf used to shelve the lyophilized material. Lyophilized box Operating temperature range -60 ℃ - +80 °C. The shelf operating temperature range +125-55 ℃. The condensation is used to condense the material sublimation of water vapor generated with takeovers and lyophilized box connected.Refrigeration cycle is generally complex cascade,involving two thermal expansion valve and two solenoid shut-off valve in the cooling system,leading to the freeze-dried box and water catching the two solenoid shut-off valve chain to each other,an open,Close state.The vacuum system consists of freeze-dried case of water traps and vacuum,to select vacuum pump,selected rotary vane pump.Heating system。