Nitrogen filling pipeline module for warehouse capable of achieving bidirectional conversion between entrance and exit

The utility model discloses an inlet and outlet bidirectional conversion warehouse nitrogen filling loop pipeline module. The warehouse nitrogen filling loop pipeline module is characterized by comprising a nitrogen making machine, a fan, a butterfly valve 1, a butterfly valve 2, a butterfly valve 3, a butterfly valve 4, a fan inlet pipe group, a fan outlet pipe group A, a warehouse nitrogen circulation inlet and outlet manifold C, a warehouse nitrogen circulation inlet and outlet manifold D and a nitrogen inlet pipe group B, two pairs of electric butterfly valves are adopted for cross control, and bidirectional exchange of nitrogen in and out of the warehouse is achieved. Through conversion of the two modes, the purpose of nitrogen circulation inlet and outlet bidirectional conversion is finally achieved. The butterfly valve used by the pipeline module is an electric butterfly valve, automatic switching can be achieved through a control program, response is rapid, switching is convenient, the complexity of m