| 摘要 |
A centrifugal pump for conveying liquids with deposited solids has two grooves winding in opposite directions around the impeller axle from the inside to the outside, one groove being in the radial annular surface of the sealing cover of the pump housing and the other in the impeller hub. These surfaces rotate relative to each other and are separated from each other by a leakage gap. The radial inner wall of each groove forms a shearing edge with the adjacent annular surface and the grooves open outwardly towards the surge chamber of the pump housing and inwardly towards a central leakage-collecting chamber. The collecting chamber is connected to the cooling jacket of a pump motor and an outlet leads back to the suction inlet of the pump. Water penetrating into the leakage gap cools the motor and solids penetrating into the gap are separated by the shearing edges from the annular surfaces and forced back to the pressure side of the pump by the grooves.
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