SWIVELLING LEAD-THROUGH FOR TWO DIFFERENT FLUIDS

The rotating duct for two different fluids has a stationary housing (1) and a hollow shaft (2) which can rotate therein, is supported such that it cannot be displaced axially, and is provided with a central duct channel (5) for the first fluid and at least one second duct channel (6), parallel thereto, for the second fluid. Two separate inlet channels (9, 26) for the two fluids and two sliding-ring sealing arrangements (7a, 7b, 8; 10a, 10b, 11), which are arranged coaxially with respect to the rotation axis between said inlet channels and the hollow shaft (2), are provided in the housing (1), via which the fluids can be supplied separately to the duct channels. In this case, the first sliding-ring sealing arrangement (7a, 7b, 8) is arranged centrally between the inner end (2a) of the hollow shaft (2) and a housing part (1a) having the first inlet channel (9), while the second sliding-ring sealing arrangement (10a, 10b, 11) encloses the hollow shaft concentrically and comprises a sliding ring (10a) which can rotate together with the hollow shaft (2) and is provided with at least one radial duct (27), as well as two sliding rings (10b) which are in contact with the housing (1) and continuously rest against the two end sides of said sliding ring (10a), under spring pressure. The second sliding-ring sealing arrangement (10a, 10b, 11) can be displaced axially with respect to the housing (1) and the hollow shaft (2). The sliding ring (10a) which can rotate is arranged in a rotationally fixed manner on an inner bush (12) which surrounds the hollow shaft (2) concentrically, can be coupled thereto, and can be displaced axially. The two sliding rings (10b) which are in contact are arranged in an outer bush (16) which surrounds the inner bush (12) concentrically, can be displaced axially and has an annular piston (17) which can be displaced in a cylinder space (18) in the housing (1).