Self-locking fireproof valve

The utility model relates to the technical field of fireproof valves, in particular to a self-locking type fireproof valve which comprises a valve body, a locking assembly, fireproof blades and an executing mechanism, installation pieces are arranged on the periphery of the valve body in a protruding mode, and a ventilation cavity is formed in the valve body. The locking assembly wraps the inner wall of the ventilation cavity, and a rotating groove is formed in the locking assembly; the fireproof blades are rotationally connected to the rotating groove, the multiple fireproof blades are arranged side by side and abut against the locking assembly, and self-locking mechanisms are arranged among the multiple fireproof blades. The executing mechanism is connected to the valve body, and the executing mechanism penetrates through the valve body and is connected to the fireproof blades in a driving mode. The utility model aims to improve the air tightness and the self-locking capability of the fireproof valve and im