DRAUGHT FAN VOLUTE SEAL STRUCTURE

摘要

A draught fan volute seal structure comprises a motor (1), a volute (2) and a wind wheel (23). An air inlet (21) and an air outlet (22) are arranged on the volute (2); the wind wheel (23) is arranged inside the volute (2); a through hole (24) is arranged at the top of the volute (2); a rotating shaft (11) of the motor (1) penetrates the through hole (24) and is connected with the wind wheel (23); a seal ring (3) is arranged at the position of the through hole (24) on the volute (2); an annular groove (31) engaged with the volute (2) is arranged on an external side of the seal ring (3); a central hole (32) is arranged in the middle of the seal ring (3); an annular edge (33) is protruded from the middle of a wall face of the central hole (32); the rotating shaft (11) passes through the center hole (32) and clings to the annular edge (33). The draught fan volute seal structure is simple in structure, convenient to assemble and good in seal effect, prevents foreign matters like dust from entering the volute, and guarantees normal working of the wind wheel.