| 摘要 |
The invention relates to a high pressure swivel comprising an inner and an outer annular wall. Each annular wall is connected to a respective distribution member via apertures which have an axial dimension which is smaller than the diameter of the hydrocarbon inlet or outlet. In this way the pressure area between the seals of the inner and outer rotatable walls is reduced. In a preferred embodiment, each distribution member comprises a chamber that is defined by the external surface of the inner and outer annular walls, and an enclosing wall. In this way an effective thermal isolation is provided by the distribution chambers adjacent the external surfaces of the inner and outer rings. Deformation of the distribution chambers of the swivel according to the present invention will tend to decrease the width of the seal extrusion gap. Furthermore, the relatively large inlet and outlet openings in the distribution chambers are located at large radial distances from the seals. Thereby deformation at the inlet and outlet does not negatively affect the sealing capacity. The swivels according to the invention are of light weight, they can withstand high pressures and can be easily manufactured and stacked in vertical or concentric configurations which consume relatively little space. |
