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

Patent metadata

Field	Value
Publication number	US-9803753-B2
Application number	US-201314415942-A
Country	US
Kind code	B2
Filing date	Jul 19, 2013
Priority date	Jul 20, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A sealing device for a vessel to achieve a fluid-tight seal in an aperture made in the lateral wall of said vessel, into which aperture a shaft is inserted. The sealing device comprises first sealing means disposed in contact with the shaft in the zone of said aperture, and second sealing means, comprising a containing body and a flexible connection element. The first sealing means comprise a plurality of sealing rings, disposed coaxial to the shaft and in contact with the latter, and a containing tube to contain the sealing rings. The lateral wall of the vessel comprises an interface flange. A closing flange is connected to the interface flange and to a flanged end of the containing body by means of attachment means and is positioned in contact with the containing tube and with the flexible connection element to keep the first sealing means in a determinate axial position with respect to the shaft.

First claim

The invention claimed is:

1. A sealing device for a vessel suitable to contain fluids 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:
first sealing means 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, said lateral wall comprising an interface flange;
second sealing means, comprising at least a containing body fixedly attached to said interface flange and a flexible connection element disposed in said aperture with a first part fixed to said containing body and a second part connected in sealed manner with said first sealing means to allow reciprocal movements of said first sealing means and said containing body,
wherein said first sealing means comprise 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 a closing flange is connected to said interface flange and to a flanged end of said containing body by means of attachment means and is positioned in contact with said containing tube and with said flexible connection element to keep said first sealing means 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, and first constraint elements being associated to said frame and to said flanged end to allow the movement of said containing tube 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 movement of said containing tube with respect to said vessel along a second transverse axis, orthogonal to said first transverse axis and to said longitudinal axis of said shaft.

2. The device as in claim 1 , wherein said containing body is at least partly inserted in said aperture and is suitable to contain said first sealing means, and said flexible connection element is interposed between said first sealing means and said containing body and suitable to connect said first sealing means to said containing body.

3. The device as in claim 1 , wherein said flexible connection element has a first end connected to said containing body and a second end, opposite said first end, connected to said containing tube.

4. The device as in claim 1 , wherein said closing flange comprises at least two pivoting elements, positioned on opposite sides and aligned along said second transverse axis and suitable to pivot in second cavities of said frame, support elements being provided in said second cavities to support said pivoting elements and allow said closing flange to oscillate around said second transverse axis.

5. The device as in claim 1 , wherein it also comprises third sealing means, disposed in contact with said shaft and cooperating with said first sealing means.

6. The device as in claim 1 , wherein said first sealing means comprise a compression bushing at least partly contained inside said containing element and suitable to hold said sealing rings axially compressed.

7. The device as in claim 5 , wherein said third sealing means comprise at least an annular cavity, made in an internal wall of said compression bushing and delimited by the latter and by said shaft, said annular cavity being suitable to contain a fluid under pressure.

8. The device as in claim 7 , wherein said third sealing means comprise at least a sealing ring, disposed inside a seating made in said compression bushing and communicating with said annular cavity, coaxial to said shaft and in contact with it, said at least one sealing ring being compressed on said shaft by at least an inflatable gasket, disposed outside said sealing ring.

9. 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.

10. The device as in claim 1 , 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.

Assignees

• Danieli Off Mecc
• Hyl Tech S A De C V

Inventors

• Negra Angelico Della
• Zampa Massimiliano
• Antonini Riccardo

Classifications

• F27D2099/0078

  Means to minimize the leakage of the furnace atmosphere during charging or discharging · CPC title

• F16J15/18 Primary

  with stuffing-boxes for elastic or plastic packings · CPC title

• F27D99/0073

  Seals · CPC title

• F16J15/348 Primary

  Pre-assembled seals, e.g. cartridge seals · CPC title

• F16J15/187 Primary

  Self-aligning stuffing-boxes · CPC title