| 摘要 |
A double slide ring seal for hydraulic rotary machines such as pumps and turbines, in which the sealing pressure is generated by spring pressure is characterised by at least one sealing slide ring (10) and at least one resilient closed chamber (17) formed by bellows (15, 16) the pressure in the chamber (17) being controlled to open the seal (10, 11) in accordance with the rotary movement of the machine to be sealed and the pressure acting against the slide ring seal. The closed chamber (17) is located so as axially to displace annular element (12) relative to a shaft (1). The annular element 12 carries a further slide ring 14. The annular element (12) is connected to the slide ring (10) via a bellows (13). The annular element may carry the slide ring (10) (Fig. 2). A labyrinth seal (22) and a pressurized gas seal may be provided downstream of the double slide ring seal. <IMAGE> |
