FIELD: engines and pumps.
SUBSTANCE: clearance between pump casing 1 and, at least, one impeller 4 is permanently sealed on impeller pressure side 3 toward its suction side 4. Seal ring consisting of stiff pressure ring 7 and elastic circular sealing edge 8 connected with pressure ring 7 in casing 1 between pressure side 3 and suction side 4. Edge 8 of operated pump slides in the area of impeller inlet 5 fits in impeller sliding surface 6' made on impeller 2. For this, seal ring is positioned by actuator 9 in pump casing 1 and has its sealing edge 8 pre-tensioned and inclined to said sliding surface 6'.
EFFECT: decreased leaks, higher efficiency, simple design.
27 cl, 5 dwg
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