Sealing device, in particular for a shaft inserted transversely in a vessel of fluids under pressure or granular material in movement

A sealing device for a vessel suitable to contain fluids at temperatures above 800° C. under pressure and/or granular material in movement, to achieve a fluid-tight seal in an aperture made in the lateral wall of said vessel, into which aperture a shaft is inserted in a through manner and with play, said sealing device comprising:

• a first seal disposed in contact with said shaft in the zone of said aperture and configured to follow possible axial and flexional movements of said shaft, while still allowing a possible rotation of said shaft with respect to them and to said lateral wall,
• a second seal, comprising at least a containing body and a flexible connection element and disposed in said aperture with a first part fixed to said lateral wall and a second part connected in sealed manner through the flexible connection element with said first seal to allow reciprocal movements of said first seal and said lateral wall,
• wherein said first seal comprises a plurality of sealing rings, disposed coaxial to said shaft and in contact with the latter, and a containing tube to contain said sealing rings and to constrain said sealing rings in a determinate axial position with respect to said shaft,
• wherein said lateral wall of said vessel comprises an interface flange, wherein a closing flange is connected to said interface flange and to a flanged end of said containing body and is positioned in contact with said containing tube and with said flexible connection element to keep said first seal in a determinate axial position with respect to said shaft, and
• wherein said sealing device also comprises a frame, positioned outside and coaxially to said flanged end of said containing body, first constraint elements being associated to said frame and to said flanged end to allow the movement of said containing body with respect to said vessel along a first transverse axis, orthogonal to the longitudinal axis of said shaft;
• second constraint elements are associated to said frame and to said closing flange to allow the movement of said containing tube with respect to said vessel along a second transverse axis, orthogonal both to said first transverse axis and to said longitudinal axis of said shaft,
• wherein said first constraint elements comprise at least a first cavity, made in said frame and suitable to contain, with play, a pin integrated in said flanged end of said containing body.