Non-contact type water wheel main shaft sealing structure

The utility model relates to a non-contact type water wheel main shaft sealing structure, comprising a moving ring sleeved and fixed on a water wheel main shaft, a fixed ring sleeved at the outer side of the moving ring in a clearance manner and an air shroud ring; the non-contact type water wheel main shaft sealing structure is characterized in that: the fixed ring comprises an upper ring body and a lower ring body, the upper ring body and the lower ring body are round sleeve bodies formed by circumferential splicing, a flange is arranged at the lower end of the upper ring body, flanges are arranged at two ends of the lower ring body, the flange at the lower end of the upper ring body is connected with the flange at the upper end of the lower ring body by a fastener, the flange at the lower end of the lower ring body is connected with a top cap of a water turbine by the fastener, the air shroud ring is arranged at the position where the lower ring body is connected with the top cap of the water turbine, an a