| 摘要 |
A device comprising a shaft ( 1 ), a front ring ( 2 ), which is non-positively and positively connected to this shaft, an end ring ( 3 ), which is non-positively and positively connected to the shaft at a distance A from the front ring, and a loose mixing ring ( 4 ), which is freely rotatable and located between the front ring and the end ring, wherein the front ring and the end ring in each case have at least one channel ( 2 k) or ( 3 k), respectively, which runs axially parallel, at an angle in relation to the axis of the shaft or helically, and has in each case at least two regions ( 2 b<SUB>1 </SUB>and 2 b<SUB>2</SUB>) or ( 3 b<SUB>1 </SUB>and 3 b<SUB>2</SUB>) of different outside diameters, of which the region with the smaller outside diameter ( 2 b<SUB>2</SUB>) or ( 3 b<SUB>2</SUB>) is respectively located on the side facing the mixing ring, and the mixing ring has a first region ( 4 b<SUB>1</SUB>) in which its inside diameter is large enough for it to be able to overlap with the region of smaller diameter of the front ring ( 2 b<SUB>2</SUB>), has an adjoining region ( 4 b<SUB>2</SUB>) in which the mixing ring has on its inner side at least one channel ( 4 k) which runs axially parallel, at an angle in relation to the axis of the shaft or helically thereto, and also an adjoining third region ( 4 b<SUB>3</SUB>), in which its inside diameter is large enough for it to be able to overlap with the region of smaller diameter of the end ring ( 3 b<SUB>2</SUB>) and the mixing ring is so long that, in its respective end positions, the other of the two rings ( 2 ) or ( 3 ) respectively is partially overlapped by the mixing ring.
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