| 摘要 |
A rotatable swivel and swivel assembly (5) by which one or more conduits are rotatably (7) connected. The swivel is especially adapted for rotatable connection of conduits carrying fluids under high pressure. Inner and outer concentric ring structures (10, 20) are provided which upon registration define a fluid conduit chamber (30) and a bearing raceway chamber (40). Bearing balls (41) are placed in the bearing raceway chamber (40). Face seals (15, 16) are provided in annular upwardly and downwardly facing grooves (17, 18) in one of the ring structures above and below the fluid conduit chamber and sealingly engage annular surfaces (116, 117) of the other of the ring structures. A second embodiment of the rotatable swivel includes a swivel body, a ball bearing assembly, and a primary upper seal (270) axially offset from a primary lower seal (274) for sealing a conduit chamber (216) is disclosed. Pressurization of the conduit chamber (216) of the swivel in cooperation with the differential axial offset of the primary seals creates axial pre-loading of the swivel operably aiding in the sealing of the conduit chamber and maintaining the concentricity of the bearing assembly between a rotable outer ring (248) and a stationary inner ring (222) and providing wear compensation for the swivel. Secondary upper (280) and lower seals (286) are disclosed whereby if the primary seals fail to retain pressure in the conduit chamber, the respective secondary seal maintains the initial axial loading of the failed primary seal. |
