Liquid nitrogen freezer for segmented freezing

The utility model discloses a liquid nitrogen freezer for segmented freezing. Relating to the technical field of freezers, the device comprises a freezing pipe which is provided with a liquid nitrogenconveying pipe, the liquid nitrogen conveying pipe comprises a liquid inlet pipe and a liquid outlet pipe. At least one layer of heat insulation plate is arranged in the freezing pipe, so that the interior of the freezing pipe is divided into a plurality of freezing chambers; the liquid inlet pipe and the liquid outlet pipe both extend into the freezing cavities, each freezing cavity is providedwith an opening and closing control assembly, and the liquid nitrogen conveying pipe is communicated with or blocks the corresponding freezing cavity through the corresponding opening and closing control assembly. An operator can control the corresponding on-off control assemblies according to needs, the freezing effect is controlled in a segmented mode, energy losses are reduced, the cooling andfreezing accuracy is improv