CPC F16J 15/32 (2013.01) [F16J 15/3212 (2013.01); F16J 15/3248 (2013.01); F16J 15/3276 (2013.01)] | 17 Claims |
1. Metallic sealing assembly for sealing between a rotating shaft and a fixed frame of a receiving machine, comprising:
a flexible metallic sealing joint with two concentric tori having different average diameters, comprising:
a first metallic helical spring with touching turns closed onto itself and having, at rest, the shape of a torus, called inner torus,
a second metallic helical spring with touching turns closed onto itself and having, at rest, the shape of a torus, called outer torus, the outer torus having an average diameter greater than the average diameter of the inner torus, one of the inner and outer tori being positioned between a rotating part and a non-rotating part and thus being called “dynamic torus”, and the other of the inner and outer tori being positioned between two parts not rotating with respect to one another and thus being called “static torus”,
a metallic envelope in which the inner torus and the outer torus are embedded and maintained, having, at rest, the shape of a hollow torus comprising an inner housing and an outer housing, respectively for the embedding of the inner torus and of the outer torus, the surface of the envelope comprising an annular opening between the inner and outer housings, said envelope comprising:
an inner covering portion defining the inner housing and allowing the partial covering of the inner torus,
an outer covering portion defining the outer housing and allowing the partial covering of the outer torus,
an intermediate portion, called inter-tori, connecting the inner covering portion and the outer covering portion, formed facing the annular opening,
a shaft rotating about an axis of rotation, comprising an annular shoulder against which the metallic sealing joint bears at the static torus, the metallic sealing joint positioned around the rotating shaft being centred via its inner diameter,
a part called back, comprising a contact face, flat, against which the metallic sealing joint bears at the dynamic torus,
a spacer, positioned around the rotating shaft so that the metallic sealing joint is blocked between on the one hand the spacer and on the other hand the contact face of the back, the spacer being mounted on the rotating shaft in a sliding way along the axis of rotation of the rotating shaft,
a metallic part forming a bonnet covering the assembly comprising the metallic sealing joint and at least the contact face of the back, the bonnet being passed through by the rotating shaft and being fastened onto the frame and/or onto the back, on the exterior of the contact face, the rotating shaft being free in rotation with respect to the bonnet and axially rigidly connected to the bonnet.
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