| 摘要 |
<p>A multi-path swivel, for example for transfer of gas, liquids, power and control signals between two rotating parts (3, 4), has multiple flexible lines (5) for each duty which are arranged in a concentric circle of constant radius (28) and deflect into a helical shape when the swivel is rotated by a limited amount either way from the central position where the lines are straight. A low stress helical shape is maintained by movement, for example by rams (11), of one part (9) towards the other (3) in ratio to the rotation and individual line torsion is removed by individual line swivels (8). When applied to a heavy duty marine situation the swivel may form part of a mooring buoy or built-in turret, the upper part (4) being free to rotate a designed amount relative to a lower part (3) fixed to the seabed by moorings (2) and the main loads between the two parts may be transferred by roller and friction bearings (15, 16).</p> |
