Vorrichtung zum beruehrungslosen Dichten des Plungers im Zylinder einer Hochdruckpumpe oder Hochdruckkompressors

摘要

The device has an annular sealing element (6) which surrounds the plunger (1) and is arranged in an annular chamber (5) of the cylinder (2). The outside diameter of the sealing element (6) increases from the high-pressure side towards the low-pressure side of the compressor. The sealing element (6) is elastically deformable under the pressure of the medium in the annular chamber (5), the initially large installation clearance (h6) of the sealing element (6) in relation to the plunger (1) decreasing. Arranged in the annular chamber (5) is a front ring (8) which likewise surrounds the plunger (1), rests in sealing fashion on the tapered end of the sealing element and has a considerably larger outside diameter than the tapered end. The clearance (h8) of the front ring is considerably smaller than the installation clearance (h6) of the sealing element (6). Because of its small clearance, the fitting of the front ring (8) results in a sealing effect even during the starting of the high-pressure compressor or high-pressure pump, i.e. before the sealing element (6) is exerting a sealing effect, which comes into action only at relatively high pressures. <IMAGE>