Nitrogen charging system structure in cold box

The utility model relates to a nitrogen charging system structure in a cold box, which comprises a cold box body, a heat insulation material is filled in the cold box body, a nitrogen charging pipeline assembly is arranged in the cold box body, and a plurality of gas nozzles convenient for releasing nitrogen are arranged on the nitrogen charging pipeline assembly. The nitrogen charging pipeline assembly comprises a leading-in pipeline, a bottom pipeline, a long vertical pipeline, a short vertical pipeline and a horizontal pipeline, one end of the leading-in pipeline extends out of the cold box body, the other end of the leading-in pipeline is communicated with the bottom pipeline, the long vertical pipeline and the short vertical pipeline are both perpendicular to the bottom pipeline and are communicated with the bottom pipeline, and the horizontal pipeline is arranged on the long vertical pipeline; and the pipeline is communicated with the long vertical pipeline. The cold box has the beneficial effects that