Patent ID: 8500128

Claim:
A spindle arrangement comprising: a spindle housing with a hollow space therein and with a liquid feed line communicating from outside of the spindle housing into a feed chamber formed within the hollow space; a spindle that is rotatably supported in the hollow space, wherein a liquid flow channel extends along the spindle in an axial direction of the spindle, and a feed opening in the spindle communicates from the feed chamber into the liquid flow channel; a first brush seal arranged concentrically around the spindle in the hollow space; a second brush seal arranged concentrically around the spindle in the hollow space; a first leakage drain line; and a liquid in at least the feed line, the feed chamber and the liquid flow channel; wherein: the second brush seal is spaced apart from the first brush seal in the axial direction, an annular first leakage chamber is formed in the hollow space and is bounded axially between the first and second brush seals and radially between the spindle and the spindle housing, the first brush seal separates the first leakage chamber from the feed chamber, the first leakage drain line communicates from the first leakage chamber out of the spindle housing, a first wall surface area of the spindle bounding the first leakage chamber is imperforate and without communication into the liquid flow channel, and the liquid feed line supplies the liquid as a pressurized liquid to flow from the liquid feed line into the feed chamber at a first liquid pressure and hence to the liquid flow channel, the first and second brush seals hinder leakage of the liquid from the feed chamber past the first brush seal into the first leakage chamber and from the first leakage chamber past the second brush seal respectively, some of the liquid leaks past the first brush seal into the first leakage chamber at a leakage chamber pressure, and the first liquid pressure in the feed chamber is higher than the leakage chamber pressure in the first leakage chamber.