Floating sealing device for vertical pump

The utility model discloses a floating sealing device for a vertical pump. The floating sealing device comprises a shaft sleeve, an upper coupling bolt and a thin-wall sleeve, wherein the shaft sleeve is arranged at the upper end of a shaft outer ring; the upper coupling bolt is coupled with the shaft sleeve through the thin-wall sleeve; a lower coupling bolt is coupled with a clamping ring through the lower end of the thin-wall sleeve; a sealing ring is sleeved on a shaft; and a bump on the sealing ring is arranged inside a groove formed by the thin-wall sleeve and the clamping ring. With the adoption of the floating sealing device for the vertical pump, clean bearing cooling water and impurity liquid in the shaft sleeve can be effectively isolated by the sealing ring when the liquid containing impurity particles is conveyed by the vertical pump, thereby the impurity particles can be prevented from entering the shaft sleeve at the maximal degree, and the abrasion of the bearing is greatly improved. A small sealed gap is formed in an axial direction, so that friction and deadlock phenomena of a spindle cannot be generated in rotation by floating arrangement, thereby the service life of the sealing device is prolonged.