Coke oven gas fan with high sealing performance

The utility model relates to a coke oven gas blower with high leak-tightness, consisting of a motor unit, a transmission unit, an impeller and a housing. The transmission shaft of the transmission unit is coaxially sheathed with an external sealing sleeve, an internal sealing sleeve is coaxially sheathed between the external sealing sleeve and the transmission shaft, and a sealing ring is embedded between the internal sealing sleeve and the external sealing sleeve. The innovative points are as follows: the a blocking sleeve embedded in an annular groove arranged on the rear end surface of the wheel disk of the impeller extends from the front end of the external sealing sleeve, and a radial guide annular groove is arranged on the outer peripheral wall surface of the blocking sleeve and outside the end surface of the wheel disk. The utility model has scientific and reasonable structure design, enables a blower transmission unit part arranged at one side of a gas housing to achieve better leak-tightness effect b