Freeze dryer

The utility model relates to the technical field of drying equipment, in particular to a freeze dryer which comprises an air inlet assembly, a heating assembly, a heat exchanger, a refrigerating assembly, a vacuum assembly, a drying box, a cold trap and a discharge pipe. A to-be-dried object is put into the drying box, sterile gas is input into the drying box through the gas inlet assembly, the refrigeration assembly is used for refrigerating the cold trap and the heating box, moisture in the object is condensed into ice, the heating assembly is used for providing heat for the drying box, and the vacuum assembly is used for keeping the interior of the drying box in a low-pressure state. And ice in the object is directly sublimated into water vapor, and the water vapor is captured by the cold trap for defrosting, so that the object is dried, and the drying efficiency is improved. 本实用新型涉及干燥设备技术领域，具体涉及一种冻干机，冻干机包括进气组件、加热组件、换热器、制冷组件、真空组件、干燥箱、冷阱和排出管；将待干燥的物体放入干燥箱，通过进气组件向干燥箱输入无菌气体，利用制冷组件对冷阱和加热箱进行制冷，物体内的水分凝结成冰，利用加热组件为