In known pumps of this type, the cross-sections of the channels between the vanes of the impeller are designed so as to allow the passage of relatively large solid bodies. This implies a construction where the channel impellers generally comprise only 1 to 3 vanes. Channel impeller pumps are successfully used for pumping liquids that are charged with thick matter, sludge, slags, etc. Balance Valves Their ability to expel gaseous accumulations (including air), however, is limited as in other centrifugal pumps too.

The underlying aim of the invention is to provide a centrifugal pump whose ability to expel gaseous accumulations is significantly improved.

Centrifugal pumps or channel impeller pumps having satisfactory specific characteristics for solving this problem are not known to the inventor.

Since this class of pumps is not comparable to free-flow pumps on account of their different operating modes, measures for modifying their properties are generally not transferable from one to another.

A free-flow pump has an impeller chamber in which an impeller is arranged and a vortex chamber that extends in front of the impeller chamber and is not swept by the vanes.

The liquid enters into the vane channels axially from the front side of the impeller near the hub thereof, moves outwards on an arc of nearly 180

2011-12-15

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