Device for circulating a liquid received in a container having a stirring body with an aperture provided on the stirring body

A device for circulating a liquid received in a container comprising:

• a hyperboloid or truncated cone stirring body mounted on a vertical shaft,
• wherein a plurality of transport ribs extending from a peripheral edge in a direction of the shaft is provided on an upper side of the stirring body,
• wherein a centerline between two adjacent transport ribs is defined by points of equal minimum distance from each crest line of the two adjacent transport ribs,
• wherein only one aperture is provided in the stirring body between the two adjacent transport ribs,
• wherein an aperture area delimited by an edge of the aperture has a geometric centre of gravity,
• wherein the geometric centre of gravity of the aperture area is disposed in a region between the centerline and the crest line of one of the two adjacent transport ribs,
• wherein the aperture area extends substantially in a radial direction and has a first end in a vicinity of the shaft and a second end directed toward the peripheral edge,
• wherein the aperture area is delimited on one of long sides by one of the plurality of transport ribs, and
• wherein the aperture area has a width at the second end greater than a width at the first end.