The present invention relates to the pumping art, and, more specifically, concerns a new and improved construction of hose pump containing movable pressure elements.
In the case of hose pumps, a hose is rhythmically compressed in sections for the purpose of conveying a fluid medium. To this end the hose pump is either equipped with one or a number of squeeze rolls, arranged at a rotatable body, and a hose arranged at a circular arcuate-shaped surface, or with a number of adjacently arranged punches which are moved to-and-fro by cams and a flat or planar counter element. Conveying of the fluid medium is accomplished either by the rotating squeeze rolls or by successive contact of the punches against the counter element, so that the hose is continuously pressed in a peristaltic movement.
Experience has shown that the hose of such type hose pumps are exposed to large loads and subjected to pronounced mechanical wear. This wear is attributable to the continuously identical deformation of the hose, i.e. the hose is always compressed together at the same region, and the additional tensional load of the hose by the rotating squeeze rolls, or by the additional loading by virtue of the edges of the punches.