Centrifugal pump

A centrifugal channel impeller pump for pumping liquids with solid and gaseous admixtures, comprising

• a casing having a forward lateral liquid entrance, an exit and an impeller chamber between the liquid entrance and the exit;
• the casing having a wall with an inner surface defining the chamber;
• a drivable impeller in the impeller chamber and comprising an impeller plate, at least one vane carried on the plate, and extending in the impeller chamber, the at least one vane having a forward edge which is directed toward the liquid entrance and is at least partly arranged to move in immediate proximity past the inner surface of the casing wall portion that extends around the liquid entrance, the at least one vane has a peripheral edge which extends past the liquid exit as the at least one vane passes the exit,
• the impeller plate being set back by a defined distance D and the at least one vane is axially enlarged toward the entrance by the distance D, the impeller chamber having a rearward part of the distance D;
• the impeller chamber comprises a rearward impeller chamber in which the axially enlarged rearward part of the at least one vane extends and also has a forward part that extends axially past the exit from the impeller chamber, the forward and rearward parts are separated by a virtual radial plane and the rearward part has a volume that corresponds to the distance D, in order to improve the gas transport.