Concatenation formula draught fan box body

The utility model discloses a concatenation formula draught fan box body, comprising a base plate, be equipped with the main tank body that air outlet flange fixed plate and a plurality of concatenation in proper order link to each other on the bottom plate, relative door plant and the first backup pad that sets up about every main tank body includes, the top of door plant and first backup pad is equipped with the second backup pad, air outlet flange fixed plate, bottom plate, door plant, first backup pad and second backup pad all adopt the numerical control cutting to form the installation hole site to fasten through bolt and nut. The utility model provides a concatenation formula draught fan box body reduces part specification quantity through modular concatenation design, and the equipment need not not self -tapping screw, forms the draught fan box body that the frameless frame does not have the nos self -tapping screw of welding, uses simple tool can relapse the dismouting, simplifies the part number of m