Large-caliber pressure container and floating sealing structure thereof

The invention discloses a large-caliber pressure vessel and a floating sealing structure thereof.The floating sealing structure comprises a first flange and a second flange which are pressed through a clamping mechanism, a floating ring is arranged between the first flange and the second flange, a first sealing ring is arranged on the upper end face of the floating ring, a second sealing ring is arranged on the outer circumferential face of the floating ring, and the first sealing ring and the second sealing ring are connected through a connecting rod. Radial sealing is formed; the lower end of the inner wall of the lower hole of the floating ring is in a horn mouth shape. The advantages and disadvantages of existing end face sealing and radial sealing are combined, the lower end of the floating ring is in the horn mouth shape, when pressure in a pressure container acts on the inclined face of the horn mouth, the floating ring floats upwards, the first sealing ring and the second sealing ring are pressed tigh