Rotary positive displacement pump for conveying flowable materials, impeller for such and method for conveying with such a positive displacement pump

摘要

The invention relates to a rotary displacement pump (100, 200) for conveying flowable substances (P), an impeller (30, 30 *) for such and a method for conveying with such a positive displacement pump. It is an object of the present invention to provide a positive displacement pump in this respect, which is structurally very simple and correspondingly easy to construct, in particular with regard to its impeller, which operates wear-resistant and promotes pulsation-free.This is ensured, inter alia, with a single-flow positive displacement pump (100 ) With a circumferential, groove-shaped impeller passage (32) which engages axially at least in one of the end faces of the cylindrical impeller (30) and concentric with its axis of rotation (R), • with the impeller passage (32), the groove flanks in the form of a uniformly wavy , continuously curved radially outer channel boundary (34) and just such radially inner channel boundary (36) formed and, in the radial direction and in each plane perpendicular to the rotation axis (R) seen, are equidistant from each other and in a channel base (38) ends and • with an annular guide ring (50), de r is fixedly connected to the cover body (6) or the housing body (4), engages in the impeller channel (32) and extends to the channel base (38), wherein, seen in the radial direction, all outer wave crests (WKa) of the outer channel boundary (34) and all inner wave crests (WKi) of the inner channel boundary (36) are each brought along their entire extension length to the guide ring (50)