Piston type water pressure end face sealing device for water turbine main shaft

The invention discloses a piston type water pressure end face sealing device for a water turbine main shaft, which mainly comprises a sealing pedestal, a sealing seat, a door-shaped piston type rubber ring, dowels, a sealing support, a rotary ring and an anti-abrasion block, wherein an anaerobic plane sealant taken as a seal is coated on the rotary ring and a flange surface of the sealing support; the rotary ring and the sealing support are fixedly connected through an M16X40 high-strength bolt; a lubricating cooling water groove is processed at the center of the end face of the rubber ring, and is arranged along the end face of the rubber ring in a whole circle manner; a copper pin sleeve is additionally mounted inside a pin hole of the rubber ring; a pressure release pipe is additionally mounted at the position symmetric to the sealing seat by an angle of 180 degree, and is communicated to the bottom of an annular groove of the sealing seat; an automatic pressure release valve is arranged on the pressure re