Shaft sealing structure of nuclear island air valve

The utility model relates to the technical field of air valves, and discloses a shaft sealing structure of a nuclear island air valve, which comprises an air valve and a central shaft, first annular grooves and second annular grooves are arranged at two ends in the air valve, the two second annular grooves are respectively communicated with the two first annular grooves, a limit ring is rotatably mounted in each second annular groove, and the central shaft is fixedly connected with the air valve. Baffles are arranged at the two ends of the interior of the air valve correspondingly, the two ends, away from each other, of the two baffles penetrate through the symmetrical side faces of the air valve correspondingly, the center shaft is rotationally installed in the center of the interior of the air valve, and valve plates are fixedly installed on the symmetrical side faces of the center shaft correspondingly. And matched moving mechanisms used for being matched with the valve plate and moving the baffle plate ar