Abstract: The present invention relates to a regenerative pump having a casing with a casing inlet and casing outlet, an impeller disposed on a shaft and containing at least one bucket ring with axially and radially open bucket compartments on the first and second side of the impeller, and mutually separated side channels having an entrance port, an exit port and an interrupter. The arrangement herein is such that the conveying streams on the two sides of the impeller are separated from each other. The entrance ports of the side channels on the two impeller sides are in communication with the casing inlet, and the exit ports are in communication with the casing outlet, so that the conveying streams are first subdivided and then recombined.

Abstract: In a lateral channel pump, the rotor blade compartments of a ring of blades in the rotor alternate in length, toward the center of the rotor, between long and short rotor blade compartments. The associated lateral channel has an outer contour concentric with the center of the rotor and an inner contour which tapers helically towards the outlet port. At the inlet point of the lateral channel, a partial circulating current is separated from the main circulating current as a result of the longer blade compartments. The partial current, due to its higher speed, causes the main current to circulate more rapidly between the rotor blade compartment and the lateral channel. As a result, the main current is accelerated and a higher level of efficiency is obtained.