Flame-retardant device for heavily-doped cleaning vacuum filter cartridge

The utility model belongs to the technical field of single crystal furnace production, and particularly relates to a flame-retardant device for a heavily-doped cleaning vacuum filter cartridge, which comprises a dust collector and a dust collecting barrel, and further comprises a nitrogen blowback device, a first cooling device, a second cooling device and a shielding device, and the dust collecting barrel is arranged on the lower surface of the dust collector. According to the flame-retardant device for the heavily-doped cleaning vacuum filter cartridge, the nitrogen blowback device is arranged, so that spontaneous combustion caused by the fact that oxygen is guided into a dust collector as a combustion supporting substance by a traditional blowback device mainly using compressed air is avoided, and when dust on the filter cartridge needs to be cleaned in the working process of the dust collector, a diaphragm valve on a corresponding pipeline is opened; nitrogen in the gas storage barrel enters the dust coll