Fireproof device for smoke prevention and exhaust air pipe

The utility model discloses a fireproof device for a smoke prevention and exhaust air pipe, belongs to the technical field of fire protection and smoke exhaust, and solves the problem that the existing smoke prevention and exhaust air pipe cannot meet the fire endurance requirement. The pipeline comprises a pipeline main body and a mounting ring, the mounting ring is sleeved outside the pipeline main body, the pipeline main body is of a cavity structure and consists of an inner ring pipe body and an outer ring pipe body, a pipe body interlayer is formed between the inner ring pipe body and the outer ring pipe body, the end part of the pipe body interlayer is closed, a liquid medium is filled in the pipe body interlayer, and a first steam exhaust port is arranged at the top of the outer ring pipe body. When a fire disaster occurs, smoke can be exhausted outdoors through the pipeline body, the temperature rises, liquid media in the pipe body interlayer and the ring body interlayer need to be evaporated firstly,