Oy Safematic Ltd.

Antti-Jussi Heilala

A slide ring seal for sealing the gap between a rotatable shaft (1) and a fixed wall (2) to separate a space (3) for a pressure fluid from the external space (4). The slide ring seal comprises at least one seal ring (5) mounted on a fixed wall or a shaft and at least one face ring (6) secured to said shaft or fixed wall. The seal ring and face ring are provided with sealing slide surfaces that are axially pressed against one another. Moreover, the seal ring is mounted on said fixed wall or shaft through a bellows member (7). To achieve a slide ring seal being reliable in operation and having controlled sealing properties, the bellows member (7) is isolated from the space (3) for the pressure fluid by means of a sealed space (9). Said sealed space (9) is further connected to a regulable pressure source (11) by means of a conduit (10).

Slide ring sealing assembly with bellows and fluid pressure control of

A slide-ring seal for sealing a shaft rotating with respect to a wall. The slide-ring sealing comprises a frame portion provided with connections for a sealing liquid and seal rings (4) provided with slide rings (5), which seal rings are so positioned with respect to each other that the sealing slide surfaces of the slide rings (5) are pressed against each other and rotate with respect to each other. Each slide ring (5) is thereby fastened on the seal ring (4) thereof by means of a shrinkage fit in such a manner that a radial press force (F.sub.K) of the shrinkage fit is wholly directed to act on the center of mass (K) of the cross-sectional area of the slide ring (5). In order to prevent distortion of the slide surface of the slide ring (5), an axial force (F.sub.L) created by deformations of the seal ring is wholly directed to act on the center of mass (K) of the cross-section of the slide ring (5).

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Jarvenpaa, Finland

Antti-Jussi Heilala