The utility model relates to a
metal core which has replaced the traditional
metal cores of the cold stores; after an access is opened in the
microwave radiation of the
heat energy in the vacuum freeze-
drying, the
microwave radiation provides energy directly to the material at low pressure or ultra low pressure, so as to make the water molecules in the internal and external parts of the ice
crystal sublime rapidly; the change not only has an
advantage that the
microwave can heat the internal and external part of the material at the same time, but also reserves an advantages that the prior vacuum freeze-
drying equipment can decrease temperature instantly when pre-freezing and maintain the temperature in the later period of the
desorption. The main microwave heating source is arranged in the centre of the material with no
metal wall in the utility model, which overcomes the insufficiency of heating way by the prior microwave and makes the material heated evenly; during the period of
desorption, the utility model combines the microwave heating and the shelf
silicone oil heating and makes the shelf
silicone oil heating as the last safeguard for the dry quality of the products, which enables the microwave overheating never take effect on the quality of the products. The utility model introduces the
infrared sensor to the microwave vacuum freeze-
drying equipment, which can use the microwave energy scientifically, powerfully and accurately.