Efficient heat pump vacuum low-temperature evaporation freeze-drying process and equipment

The invention discloses an efficient heat pump vacuum low-temperature evaporation freeze-drying process and equipment, and belongs to the technical field of vacuum concentration and freeze-drying two-in-one. A low-temperature low-pressure saturated refrigerant discharged through an electronic throttle valve absorbs heat of a low-temperature secondary steam heat source in an I-stage condenser to become low-temperature saturated refrigerant steam; after compression, temperature increase and enthalpy increase of a vortex compression type heat pump, the refrigerant steam enters an evaporator for heat release, after heat release, the refrigerant steam is condensed into high-pressure refrigerant saturated liquid through a II-stage working medium condenser, and the refrigerant saturated liquid continues to absorb heat and evaporate after being throttled through the electronic throttle valve and is dried into a solid material through a sublimation dryer; the solid material is conveyed into a secondary dryer to be dri