Coke oven gas fan with high transmission shaft sealability

The invention relates to a coke oven gas fan with high transmission shaft sealability, which consists of a motor group, a transmission group, an impeller and a shell, wherein a transmission shaft of the transmission group is coaxially sleeved with an outer sealing sleeve; an inner sealing sleeve is coaxially sleeved between the outer sealing sleeve and the transmission shaft; and a sealing ring isembedded between the inner sealing sleeve and the outer sealing sleeve. The coke oven gas fan has the following innovative points that: a spacer sleeve embedded into a ring groove formed on the backend face of a wheel disk of the impeller is extended and arranged at the front end of the outer sealing sleeve; and the peripheral wall of the spacer sleeve positioned outside the end face of the wheel disk is provided with a radial stream guidance ring groove. The coke oven gas fan has a scientific and reasonable structural design; by adopting a special double-layer sealing sleeve structure, thecoke oven gas fan ensures t