| 摘要 |
<p>The bushing has an outer tube in the wall aperture (3) with a seal of plastically deformable sealing substance (5), filling the space between the tube and wall. The seating substance is held between two flanges (9) on the tube outside, relatively slidable under a force of a clamping device (7). In addition in the tube, the flanges are also sealed pressure-tightly against the wall. At least one flange is in the form of an annular piston, slidable at least over the wall aperture length by the clampin device. Its motion compacts the sealing substance within the aperture. The clamping device preferably uses an external thread, at least on part of the tube. One flange is fixed on the tube, while the other abuts a clamping unit. The fixed flange may form the annular piston. The tube end, carrying the annular piston, may have a branch (10) on the side away from the piston, carrying a flexible sealing sleeve (11).</p> |
