| 摘要 |
The seal packing for shafts is intended to a device for the continuous treatment of highly viscous substances, particularly for the fabrication of high molecular density polymers by means of at least two treatment tools (3) operating in association and carried by parallel shafts (1), with input and output members for the material to be treated, as well as a vacuum reaction chamber (4). The packing comprises at least one sliding sealing ring (46, 55) containing sealing means which make the reaction chamber tight at the location where the shafts (10) pass, on the side of a chamber (11) containing the stop liquid, arranged outside and surrounding the extremity of the shaft. To avoid the penetration of the stop liquid into the reaction chamber and to improve the sealing characteristics, the seal packing is designed so that on the side turned towards the reaction chamber, each shaft (1) is surrounded by an inert gas cushion connected to the sealing means. Said cushion has a high pressure as the stop liquid. It is sealingly limited against the reaction chamber (4) by the shafts, on a section of their length surrounded by a portion of the housing (81), as well as against the pressure of the material to be treated surrounding the shafts. |
