The invention discloses a
drying unit of a
nitrogen-source
heat pump, comprising a
drying box, a
control system and an outdoor condenser, wherein the
drying box comprises a box body, a
heat pump chamber and a drying chamber; and the
heat pump chamber and the drying chamber are arranged in the box body. The drying unit forms drying gas adjusting equipment with a
nitrogen source, heat-pump equipment and a
nitrogen device form a nitrogen heat-pump combining device so as to construct a closed circulation loop which adopts nitrogen as a medium to dry materials and effectively control the content of nitrogen in the drying chamber; and high-
viscosity glass
cement is used for sealing internal and external gaps of a drying room, a ventilating channel is modified, and a baffle, an arc-shaped air guide plate and an air uniformizing plate are added to enable the gas drying medium to be uniformly distributed in the drying chamber under certain air speed. The drying unit disclosed by the invention has the beneficial effects that the heat pump and a nitrogen combining device are used, the advantages of no
pollution and low
energy consumption of the heat pump can be fully utilized, the materials are dried under the condition of adopting nitrogen as a drying medium, the oxidation of the materials is prevented, the nutritional ingredients of the materials are retained, and the quality of dried products is improved.