Pressurizing leakage-proof device for fan

The utility model discloses a pressurizing leakproof device for a fan, which comprises a fan shell, a first main shaft is rotatably mounted on the fan shell, an impeller is mounted on the first main shaft, and an inner air ring is arranged on the fan shell; a sealing plate is slidably mounted on the first main shaft, a sealing ring is fixedly connected to the sealing plate, the first main shaft is connected with a second main shaft through a lead screw, a moving assembly is arranged on the lead screw and comprises a fixing sleeve in threaded connection with the lead screw, two transverse rods are fixedly connected to the fixing sleeve, and the two transverse rods are fixedly connected to the fixing sleeve. And the cross rod is connected with the fan shell in a sliding manner. According to the sealing ring, the sealing performance of the connecting position of the sealing plate and the first main shaft is good, the situation of air leakage cannot occur in the pressurizing process, therefore, the pressurizing e