Means of securing a hollow-shaft bearing arrangement

摘要

The rotary lead-through for two different fluids has a hollow shaft (2) which is rotatably mounted in a fixed housing (1) and has two separate axial passages (4, 5). There is a mechanical seal arrangement between the hollow shaft (2) and two separate inlet passages (9, 17) for the two fluids provided in the housing (1). This arrangement comprises a common slip ring (8) which is connected at the end to the hollow shaft (2) and has a central hole (8a) and a plurality of axial passages (8b) arranged concentrically to the latter, and further comprises, in the housing (1), a central slip ring (11) and a slip ring (14) concentrically surrounding the latter. The central and the concentric slip ring (11, 14) are each held in axially displaceable slip-ring carriers (10, 13) of piston-like design held fixed in terms of relative rotation and can be pressed axially, independently of one another, against the sliding surface (8a) of the common slip ring (8) by spring pressure and the pressure of the respective fluid. To support the hollow shaft (2) in the housing (1), an aerostatic bearing arrangement (3, 3a) with only one thrust bearing (3a) is provided, and the thrust bearing acting in the opposite axial direction to the abovementioned thrust bearing is formed by the slip rings (8, 11, 14).